Polysiloxane foam compositions and related methods

Abstract

A curable organopolysiloxane foam forming composition that can be used to produce organopolysiloxane foams is described. The curable organopolysiloxane foam-forming composition contains particles that contain a platinum group catalyst and a thermoplastic polymer. The thermoplastic polymer protects other components in the curable organopolysiloxane foam forming composition from the platinum group catalyst. Thus, when sufficient heat is applied, the thermoplastic polymer softens and / or melts, which exposes the platinum group catalyst to other components to initiate a foam generation process.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of U.S. application No. 63 / 393,081, filed on July 28, 2022, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] The present disclosure relates to a foam-forming polysiloxane composition and the resulting polysiloxane foam composition. The present disclosure also relates to methods of making and using the foam-forming polysiloxane composition and the resulting polysiloxane foam composition. Background Art

[0004] In order to produce the foam of certain types of compositions, it is sometimes necessary to contact the curable components contained in the composition with a catalyst. For example, in the case of an organopolysiloxane composition curable by hydrosilylation reaction, the curable components in the composition are crosslinked by a hydrosilylation reaction catalyst (such as a platinum group catalyst). However, curing begins when the catalyst and the curable components contact, so it is necessary to prevent the catalyst and the curable components from contacting each other during storage, for example, until curing is required. When used in combination with a foaming agent, this composition can produce foam. Conventional organosilicon foam compositions involve the in-situ formation of hydrogen (H2) by the reaction between organosilicon hydrides and foaming agents catalyzed by Pt. Once all the ingredients of the composition (usually multiple parts, such as part A and part B) are mixed together, the reaction will start immediately. Hydrogen can escape before the curing step of the manufactured parts or devices. This lack of control over the generation of H2 in the process usually leads to problems such as poor device consistency, differences between batches, and heterogeneity when the scale is expanded.

[0005] Therefore, there is a need in the art for improved compositions, such as one-component compositions, for producing foams. Such compositions, foams, and methods related thereto are disclosed herein. Summary of the invention

[0006] Disclosed herein is a curable organopolysiloxane foam-forming composition. The curable organopolysiloxane foam-forming composition comprises (A) 100 parts by weight of an organopolysiloxane represented by the following average unit formula: a SiO (4-a) / 2，wherein R is a substituted or unsubstituted monovalent hydrocarbon group, and "a" is a number from 1.0 to 2.4, and has at least an average of 1.5 alkenyl groups in the molecule. The curable organopolysiloxane foam-forming composition further comprises (B) 3 to 70 parts by weight of an organopolysiloxane having at least an average of 1.5 silicon-bonded hydrogen atoms in the molecule. The curable organopolysiloxane foam-forming composition further comprises (C) 0.1 to 50 parts of a blowing agent. The curable organopolysiloxane foam-forming composition further comprises (D) 0.00001 to 20 parts of particles comprising: i. a platinum group catalyst; and ii. a T of at least 20°C. g or a molecular weight controlled thermoplastic polymer having a softening temperature, the molecular weight controlled thermoplastic polymer being selected from the group consisting of: 1. having an M of about 500 g / mol to about 30,000 g / mol; w and a polydispersity index (PDI) of less than 2, polystyrene or copolymers thereof; 2. having an M of about 500 g / mol to about 30,000 g / mol w and a polymethyl methacrylate or copolymer thereof having a PDI of less than 2; and 3. having an M of about 500 g / mol to about 30,000 g / mol w and polyacrylonitrile or a copolymer thereof having a PDI of less than 2; wherein the platinum group catalyst is completely encapsulated within the thermoplastic polymer. The curable organopolysiloxane foam-forming composition allows the creation of organopolysiloxane foams in a controlled manner.

[0007] Also disclosed herein is an organopolysiloxane foam. The organopolysiloxane foam can be produced from the curable organopolysiloxane foam-forming composition disclosed herein. The organopolysiloxane foam contains a T of at least 20° C. dispersed throughout the organopolysiloxane foam. g or a softening temperature of about 500 g / mol to about 30,000 g / mol; w and a polydispersity index (PDI) of less than 2; b) having an M of about 500 g / mol to about 30,000 g / mol; w and a polymethyl methacrylate or copolymer thereof having a PDI of less than 2; and c) having an M of about 500 g / mol to about 30,000 g / mol. w and polyacrylonitrile or a copolymer thereof having a PDI of less than 2.

[0008] Also disclosed herein is a method for producing an organopolysiloxane foam, the method comprising the steps of: a) providing a curable organopolysiloxane foam-forming composition disclosed herein; and b) heating the curable organopolysiloxane foam-forming composition to a temperature effective to soften or melt a thermoplastic polymer to release a platinum group catalyst, thereby promoting a reaction to produce the organopolysiloxane foam.

[0009] Additional advantages will be partially set forth in the description that follows and may be partially understood from the description, or may be learned through practice of the aspects described below. The advantages described below will be realized and obtained by means of the elements and combinations particularly pointed out in the appended claims. It should be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive. DETAILED DESCRIPTION

[0010] The present invention may be understood more readily by reference to the following detailed description of the invention and the Examples included therein.

[0011] Before the particles, compositions, articles, systems, devices and / or methods of the present invention are disclosed and described, it should be understood that they are not limited to specific methods unless otherwise indicated, or are not limited to specific reagents unless otherwise indicated, as these specific methods and specific reagents can undoubtedly vary. It should also be understood that the terms used herein are only used for the purpose of describing specific aspects and are not intended to be limiting. Exemplary methods and materials are now described, but any methods and materials similar or equivalent to those described herein can be used to practice or test the present invention.

[0012] All publications mentioned in this article are incorporated herein by reference, to disclose and describe the method and / or material relevant to the object quoted by the publication. The publications discussed in this article are provided only for their disclosures before the filing date of the application. Any content in this article should not be interpreted as admitting: the present invention loses the qualification earlier than such publication due to the previous invention. In addition, the publication date provided herein may be different from the actual publication date, and the latter may need independent confirmation.

[0013] A. Definition

[0014] As used herein, the nomenclature of compounds can be given by common names and names assigned by the International Union of Pure and Applied Chemistry (IUPAC), Chemical Abstracts Service (CAS) nomenclature suggestions, which are hereby incorporated by reference herein. Those skilled in the art can easily determine the structure of the compound and give the name by systematically simplifying the compound structure using naming conventions.

[0015] As used in the specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise.

[0016] Ranges may be expressed herein as starting from "about" one particular value and / or to "about" another particular value. When such a range is expressed, another aspect includes from a particular value and / or to another particular value. Similarly, when a value is expressed as an approximation by using the antecedent "about", it is understood that the particular value forms another aspect. It is also understood that the endpoints of each range are distinct relative to the other endpoint and independent of the other endpoint. It is also understood that multiple values ​​are disclosed herein, and in addition to each value itself, these values ​​are also disclosed herein as "about" the particular value. For example, if the value "10" is disclosed, "about 10" is also disclosed. It is also understood that each unit between two particular units is also disclosed. For example, if 10 and 15 are disclosed, 11, 12, 13, and 14 are also disclosed.

[0017] References in the specification and the concluding claims to parts by weight of a particular element or component indicate the weight relationship of that element or component to any other element or component or article expressed in parts by weight. Thus, in a composition comprising 100 parts by weight of component X and 9 to 40 parts by weight of component Y, X and Y are present in a weight ratio of 100:9 to 100:40 or 0.09 to 0.4, and are present in this ratio regardless of whether the composition contains additional components.

[0018] In addition, references in the specification and the concluding claims to the molar ratio of a particular element or component indicate the molar relationship between that element or component and any other element or component in the composition or article expressed in molar ratio. Thus, in a composition containing five moles of component X and two moles of component Y, X and Y are present in a molar ratio of 5:2 or 5 / 2 or 2.5, and are present in this ratio regardless of whether additional components are contained in the composition. Unless expressly stated to the contrary, the weight percentage (wt%) of a component is based on the total weight of the preparation or composition containing the component.

[0019] As used herein, the terms "optional" or "optionally" mean that the subsequently described event or circumstance may or may not occur, and that the description includes instances where said event or circumstance occurs and instances where it does not.

[0020] The polydispersity index (PDI) mentioned herein is the weight average molecular weight (M w ) divided by the number average molecular weight (M n ), and is usually expressed as: PDI = M w / M n .

[0021] Unless expressly stated otherwise, it is not intended that any method set forth herein be construed as requiring that its steps be performed in a particular order. Therefore, in the event that a method claim does not actually enumerate the order in which its steps are to be followed, or in the event that there is no specific statement in the claims or specification that the steps are to be limited to a particular order, then it is not intended that an order can be inferred in any event. This applies to any possible non-express basis for interpretation, including: matters of logic regarding arrangement of steps or operational flow; plain meaning derived from grammatical organization or punctuation, and the number or type of embodiments described in the specification.

[0022] Components for preparing the particles and compositions disclosed herein and components used in the methods disclosed herein are disclosed. These and other compounds are disclosed herein, and it should be understood that when combinations, subsets, interactions, groups, etc. of these materials are disclosed, although specific references to various individual and collective combinations and arrangements of these components cannot be explicitly disclosed, each is specifically contemplated and described herein. For example, if a specific silicone composition is disclosed and discussed, and various modifications that can be made to a variety of compounds including the silicone composition are discussed, each and every combination and arrangement of the composition and possible modifications are specifically contemplated unless explicitly indicated to the contrary. Thus, if a class of compounds A, B, and C are disclosed, and a class of silicone compositions D, E, and F are disclosed, and an example AD of a particle or composition is disclosed, each should be considered individually and collectively, even if each is not listed individually, which means that the combinations AE, AF, BD, BE, BF, CD, CE, and CF are considered disclosed. Likewise, any subset or combination of these is also disclosed. Thus, for example, a subgroup of AE, BF, and CE is considered disclosed. This concept applies to all aspects of this application, including, but not limited to, steps in methods of making and using silicone compositions. Thus, if a variety of additional steps can be performed, it should be understood that each of these additional steps can be performed with any specific embodiment or combination of embodiments of the present methods.

[0023] B. Curable Organopolysiloxane Foam-Forming Compositions

[0024] Organopolysiloxane foams, primarily due to their molded structure and low density, are useful in a variety of applications including, but not limited to, gaskets, medical devices, repairs, shock absorbing materials, and thermal or high thermal insulation materials.

[0025] The organopolysiloxane foam can be formed from the curable organopolysiloxane foam-forming composition disclosed herein. The components in the curable organopolysiloxane foam-forming composition are mixed, and the foam-forming process is carried out by exposing a platinum group catalyst to the remaining components in the curable organopolysiloxane foam-forming composition, which triggers a reaction to form the organopolysiloxane foam over a period of time. The organopolysiloxane foam is formed when hydrogen (H2) is generated in situ during the reactive foam-forming process. Once the components are exposed to the platinum group catalyst, this reaction and foaming process will immediately begin.

[0026] The curable organopolysiloxane foam-forming composition disclosed herein comprises particles comprising: i. a platinum group catalyst; and ii. a T of at least 20°C. g or a molecular weight controlled thermoplastic polymer having a softening temperature, the molecular weight controlled thermoplastic polymer being selected from the group consisting of: 1. having an M of about 500 g / mol to about 30,000 g / mol; w and a polydispersity index (PDI) of less than 2, polystyrene or copolymers thereof; 2. having an M of about 500 g / mol to about 30,000 g / mol w and a polymethyl methacrylate or copolymer thereof having a PDI of less than 2; and 3. having an M of about 500 g / mol to about 30,000 g / mol w and polyacrylonitrile or a copolymer thereof having a PDI of less than 2; wherein the platinum group catalyst is completely encapsulated in the thermoplastic polymer. In this way, the platinum group catalyst is isolated from other components in the curable organopolysiloxane foam-forming composition until the thermoplastic polymer with controlled molecular weight softens or melts due to increased temperature and is separated from the surrounding platinum group catalyst. The particles disclosed herein increase the control of the H2 generation process, which overcomes the processing barriers in conventional organopolysiloxane foam compositions. Therefore, the curable organopolysiloxane foam-forming composition disclosed herein can be stored for a long time without unexpected reactions. That is, during storage, the curable organopolysiloxane foam-forming composition disclosed herein is kept at a sufficiently low temperature to prevent the thermoplastic polymer from softening or melting, thereby exposing the platinum group catalyst to other components of the curable organopolysiloxane foam-forming composition.

[0027] In one aspect, the curable organopolysiloxane foam-forming composition disclosed herein can be a one-component curable organopolysiloxane foam-forming composition. In another aspect, the curable organopolysiloxane foam-forming composition disclosed herein can be a two-component or multi-component curable organopolysiloxane foam-forming composition.

[0028] Disclosed herein is a curable organopolysiloxane foam-forming composition comprising:

[0029] (A) 100 parts by weight of an organopolysiloxane represented by the following average unit formula:

[0030] R a SiO (4-a) / 2

[0031] wherein R is a substituted or unsubstituted monovalent hydrocarbon group, and "a" is a number from 1.0 to 2.4, and there are at least an average of 1.5 alkenyl groups in the molecule;

[0032] (B) 1 to 70 parts by weight of an organopolysiloxane having an average of at least 1.5 silicon-bonded hydrogen atoms in its molecules;

[0033] (C) 0.1 to 50 parts by weight of a foaming agent; and

[0034] (D) 0.00001 to 20 parts by weight of particles, the particles comprising:

[0035] i. platinum group catalysts; and

[0036] ii. Having a T of at least 20°C g or a thermoplastic polymer with a controlled molecular weight having a softening temperature, the thermoplastic polymer with a controlled molecular weight being selected from the group consisting of:

[0037] 1. Having an M of about 500 g / mol to about 30,000 g / mol w and a polydispersity index (PDI) of less than 2, polystyrene or copolymers thereof;

[0038] 2. Having an M of about 500 g / mol to about 30,000 g / mol w and polymethyl methacrylate or copolymers thereof having a PDI of less than 2; and

[0039] 3. Having an M of about 500 g / mol to about 30,000 g / mol w and polyacrylonitrile or a copolymer thereof having a PDI of less than 2;

[0040] The platinum group catalyst is completely encapsulated in the thermoplastic polymer.

[0041] In one aspect, the curable organopolysiloxane foam-forming composition may further comprise: (E) greater than 0 to 100 parts by weight of a silicone resin, wherein the silicone resin is different from component (A).

[0042] In one aspect, the curable organopolysiloxane foam-forming composition may additionally comprise: (F) greater than 0 to 150 parts by weight of an organosilicon matrix comprising an organosilicon polymer containing at least one alkenyl group, wherein the organosilicon matrix is ​​different from component (A). For example, the curable organopolysiloxane foam-forming composition may additionally comprise: (E) greater than 0 to 100 parts by weight of an organosilicon resin, wherein the organosilicon resin is different from component (A), and (F) greater than 0 to 150 parts by weight of an organosilicon matrix comprising an organosilicon polymer containing at least one alkenyl group, wherein the organosilicon matrix is ​​different from component (A). It is noteworthy that components (E) and / or (F) may fall within the scope of component (A), but are still considered to be their own components. Thus, for example, a curable organopolysiloxane foam-forming composition comprising component (E) has two distinguishable components (A) and (E), even though component (E) theoretically falls within the scope of component (A).

[0043] In one aspect, the curable organopolysiloxane foam-forming composition may further comprise (G) greater than 0 parts to 100 parts by weight of a non-functional fluid.

[0044] In one aspect, the curable organopolysiloxane foam-forming composition may further comprise greater than 0 parts to 10 parts by weight of a reaction inhibitor.

[0045] In one aspect, the curable organopolysiloxane foam-forming composition may further comprise from greater than 0 parts to 150 parts by weight of a filler.

[0046] In one aspect, the curable organopolysiloxane foam-forming composition comprises:

[0047] (A) 100 parts by weight of an organopolysiloxane represented by the following average unit formula:

[0048] R a SiO (4-a) / 2

[0049] wherein R is a substituted or unsubstituted monovalent hydrocarbon group, and "a" is a number from 1.0 to 2.4, and there are at least an average of 1.5 alkenyl groups in the molecule;

[0050] (B) 10 to 30 parts by weight of an organopolysiloxane having an average of at least 1.5 silicon-bonded hydrogen atoms in its molecules;

[0051] (C) 5 to 20 parts by weight of a foaming agent;

[0052] (D) 0.05 to 8 parts by weight of particles, the particles comprising:

[0053] i. platinum group catalysts; and

[0054] ii. Having a T of at least 20°C g or a thermoplastic polymer with a controlled molecular weight having a softening temperature, the thermoplastic polymer with a controlled molecular weight being selected from the group consisting of:

[0055] 1. Having an M of about 500 g / mol to about 30,000 g / mol w and a polydispersity index (PDI) of less than 2, polystyrene or copolymers thereof;

[0056] 2. Having an M of about 500 g / mol to about 30,000 g / mol w and polymethyl methacrylate or copolymers thereof having a PDI of less than 2; and

[0057] 3. Having an M of about 500 g / mol to about 30,000 g / mol w and polyacrylonitrile or a copolymer thereof having a PDI of less than 2;

[0058] wherein the platinum group catalyst is completely encapsulated in the thermoplastic polymer;

[0059] (E) greater than 0 to 60 parts by weight of a silicone resin, wherein the silicone resin is different from component (A); and

[0060] (G) greater than 0 to 100 parts by weight of a non-functional fluid.

[0061] In another aspect, the curable organopolysiloxane foam-forming composition comprises:

[0062] (A) 100 parts by weight of an organopolysiloxane represented by the following average unit formula:

[0063] R a SiO (4-a) / 2

[0064] wherein R is a substituted or unsubstituted monovalent hydrocarbon group, and "a" is a number from 1.0 to 2.4, and there are at least an average of 1.5 alkenyl groups in the molecule;

[0065] (B) 5 to 30 parts by weight of an organopolysiloxane having an average of at least 1.5 silicon-bonded hydrogen atoms in its molecules;

[0066] (C) 0.1 to 50 parts by weight of a foaming agent; and

[0067] (D) 0.05 to 8 parts by weight of particles, the particles comprising:

[0068] i. platinum group catalysts; and

[0069] ii. Having a T of at least 20°C g or a thermoplastic polymer with a controlled molecular weight having a softening temperature, the thermoplastic polymer with a controlled molecular weight being selected from the group consisting of:

[0070] 1. Having an M of about 500 g / mol to about 30,000 g / mol w and a polydispersity index (PDI) of less than 2, polystyrene or copolymers thereof;

[0071] 2. Having an M of about 500 g / mol to about 30,000 g / mol w and polymethyl methacrylate or copolymers thereof having a PDI of less than 2; and

[0072] 3. Having an M of about 500 g / mol to about 30,000 g / mol w and polyacrylonitrile or a copolymer thereof having a PDI of less than 2;

[0073] wherein the platinum group catalyst is completely encapsulated in the thermoplastic polymer;

[0074] (F) 10 to 40 parts by weight of an organosilicon matrix comprising an organosilicon polymer containing at least one alkenyl group, wherein the organosilicon matrix is ​​different from component (A); and

[0075] (G) greater than 0 to 100 parts by weight of a non-functional fluid.

[0076] i.Component (A)

[0077] The curable organopolysiloxane foam-forming composition comprises (A) 100 parts by weight of an organopolysiloxane represented by the following average unit formula:

[0078] R a SiO (4-a) / 2

[0079] wherein R is a substituted or unsubstituted monovalent hydrocarbon group, and "a" is a number from 1.0 to 2.4, and there are at least an average of 1.5 alkenyl groups in the molecule.

[0080] In R a SiO (4-a) / 2In the formula, R is a substituted or unsubstituted monovalent hydrocarbon group, examples of which include alkyl groups such as methyl groups, ethyl groups, propyl groups, butyl groups, pentyl groups and hexyl groups; alkenyl groups such as vinyl groups, allyl groups, butenyl groups, pentenyl groups, hexenyl groups and heptenyl groups; aryl groups such as phenyl groups, tolyl groups and xylyl groups; aralkyl groups such as benzyl groups and phenethyl groups; and halogenated alkyl groups such as 3-chloropropyl groups and 3,3,3-trifluoropropyl groups. For example, at least an average of 1.5 R groups in the molecule are alkenyl groups, such as those alkenyl groups described above. Vinyl groups and hexenyl groups can be alkenyl groups. Methyl groups and phenyl groups can be silicon-bonded groups other than alkenyl groups.

[0081] In the above R a SiO (4-a) / 2 In the formula, "a" is a number from 1.0 to 2.4. Examples of the molecular structure of this component (A) include a linear structure, a partially branched linear structure, a branched structure, a network structure, and a tree structure. Component (A) may be a mixture of two or more types of organopolysiloxanes having these molecular structures. That is, a may be 1≦a<2 or 2≦a<2.4. The viscosity of the organopolysiloxane at 25°C is not limited, but may be in the range of 50 to 1,000,000 mPa·s, such as in the range of 100 to 500,000 mPa·s.

[0082] Formula R a SiO (4-a) / 2Examples of the organopolysiloxane include, but are not limited to, a dimethylsiloxane-methylvinylsiloxane copolymer terminated at both molecular ends with a trimethylsiloxy group, a methylvinylpolysiloxane terminated at both molecular ends with a trimethylsiloxy group, a methylvinylsiloxane-methylphenylsiloxane copolymer terminated at both molecular ends with a trimethylsiloxy group, a dimethylsiloxane-methylvinylsiloxane-methylphenylsiloxane copolymer terminated at both molecular ends with a trimethylsiloxy group, a dimethylpolysiloxane terminated at both molecular ends with a dimethylvinylsiloxy group, a methylvinylpolysiloxane terminated at both molecular ends with a dimethylvinylsiloxy group, a methylphenylpolysiloxane terminated at both molecular ends with a dimethylvinylsiloxy group, end-capped with a dimethylsiloxane-methylvinylsiloxane copolymer, a methylvinylsiloxane-methylphenylsiloxane copolymer end-capped with a dimethylvinylsiloxy group at both molecular ends, a methylvinylsiloxane-diphenylsiloxane copolymer end-capped with a dimethylvinylsiloxy group at both molecular ends, a dimethylvinylsiloxane-diphenylsiloxane copolymer end-capped with a dimethylvinylsiloxy group at both molecular ends, a methylvinylpolysiloxane end-capped with a trimethylsiloxy group at one molecular end and a dimethylvinylsiloxy group at the other molecular end, a dimethylsiloxane-methylvinylsiloxane copolymer end-capped with a trimethylsiloxy group at one molecular end and a dimethylvinylsiloxy group at the other molecular end, an organopolysiloxane comprising a unit represented by the formula: R3SiO 1 / 2 And a unit represented by the formula: SiO 4 / 2 , an organopolysiloxane comprising a unit represented by the following formula: RSiO 3 / 2 , an organopolysiloxane comprising a unit represented by the formula: R2SiO 2 / 2 And the unit represented by the formula: RSiO 3 / 2 , an organopolysiloxane comprising a unit represented by the formula: R2SiO 2 / 2 , a unit represented by the following formula: RSiO 3 / 2 , and a unit represented by the following formula: SiO 4 / 2 , and mixtures of two or more types of these organopolysiloxanes. R in the above formula is a substituted or unsubstituted monovalent hydrocarbon group as described above.

[0083] As the formula R a SiO (4-a) / 2It is also contemplated to use an organopolysiloxane mixture having an average alkenyl group number of 1.5 in the molecule, i.e., an organopolysiloxane mixture obtained by mixing an organopolysiloxane having at least 2 alkenyl groups in the molecule listed above with an organopolysiloxane having no alkenyl group or having less than 2 alkenyl groups in the molecule listed below. Examples of such an organopolysiloxane having no alkenyl group or having less than 2 alkenyl groups in the molecule include dimethylpolysiloxane end-capped with a dimethylvinylsiloxy group at one molecular terminal and with a trimethylsiloxy group at the other molecular terminal, methylphenylpolysiloxane end-capped with a dimethylvinylsiloxy group at one molecular terminal and with a trimethylsiloxy group at the other molecular terminal, a dimethylsiloxane-methylvinylsiloxane copolymer end-capped with a trimethylsiloxy group at both molecular terminals and having 1 vinyl group on a molecular side chain, a dimethylpolysiloxane end-capped with a trimethylsiloxy group at both molecular terminals, and a methylphenylpolysiloxane end-capped with a trimethylsiloxy group at both molecular terminals.

[0084] In one aspect, the organopolysiloxane in component (A) is an alkenyl-terminated organopolysiloxane, an organopolysiloxane with alkenyl side groups, or an organopolysiloxane with alkenyl side groups and alkenyl side groups. For example, the organopolysiloxane in component (A) can be an alkenyl-terminated organopolysiloxane. In another aspect, the organopolysiloxane in component (A) can be an organopolysiloxane with alkenyl side groups. In yet another aspect, the organopolysiloxane in component (A) can be an organopolysiloxane with alkenyl side groups and alkenyl side groups.

[0085] In one aspect, the organopolysiloxane in component (A) may include at least two organopolysiloxanes with different molecular weights. For example, the organopolysiloxane in component (A) may include at least three organopolysiloxanes with different molecular weights. In another example, the organopolysiloxane in component (A) may include at least four organopolysiloxanes with different molecular weights. When components (E) and / or (F) are present, at least two, three or four organopolysiloxanes do not include components (E) and / or (F). For example, when component (A) of the curable organopolysiloxane foam-forming composition has an organopolysiloxane (including at least two organopolysiloxanes with different molecular weights) and component (E), then in this respect the curable organopolysiloxane foam-forming composition comprises three components: 1. a component having a molecular weight (M); 2. a component having a molecular weight (M); 3. a component having a molecular weight (M); 4. a component having a molecular weight (M); 5. a component having a molecular weight (M); 6. a component having a molecular weight (M); 7. a component having a molecular weight (M); 8. a component having a molecular weight (M); 9. a component having a molecular weight (M); 10. a component having a molecular weight (M); w ) of an organopolysiloxane component (A); 2. having an M different from (1.) w 1. an organopolysiloxane component (A); and 3. a component (E).

[0086] In one aspect, the organopolysiloxane in component (A) or each of the organopolysiloxanes in component (A) may have an M of about 500 g / mol to about 300,000 g / mol. w , M from about 500 g / mol to about 250,000 g / mol w , M from about 500 g / mol to about 300,000 g / mol w , M from about 500 g / mol to about 200,000 g / mol w , M from about 500 g / mol to about 150,000 g / mol w , M from about 500 g / mol to about 100,000 g / mol w , M from about 500 g / mol to about 90,000 g / mol w , M from about 500 g / mol to about 80,000 g / mol w , M from about 500 g / mol to about 70,000 g / mol w , M from about 500 g / mol to about 60,000 g / mol w , M from about 500 g / mol to about 50,000 g / mol w , M from about 500 g / mol to about 40,000 g / mol w , M from about 500 g / mol to about 35,000 g / mol w , M from about 500 g / mol to about 30,000 g / mol w , M from about 500 g / mol to about 25,000 g / mol w , M from about 500 g / mol to about 20,000 g / mol w , M from about 500 g / mol to about 15,000 g / mol w , M from about 500 g / mol to about 10,000 g / mol w , M from about 10,000 g / mol to about 300,000 g / mol w , M from about 15,000 g / mol to about 300,000 g / mol w , M from about 25,000 g / mol to about 300,000 g / mol w , M from about 30,000 g / mol to about 300,000 g / mol w , M from about 35,000 g / mol to about 300,000 g / mol w , M from about 40,000 g / mol to about 300,000 g / mol w, M from about 45,000 g / mol to about 300,000 g / mol w , M from about 50,000 g / mol to about 300,000 g / mol w , M from about 60,000 g / mol to about 300,000 g / mol w , M from about 70,000 g / mol to about 300,000 g / mol w , M from about 80,000 g / mol to about 300,000 g / mol w , M from about 90,000 g / mol to about 300,000 g / mol w , M from about 100,000 g / mol to about 300,000 g / mol w , M from about 150,000 g / mol to about 300,000 g / mol w , M from about 200,000 g / mol to about 300,000 g / mol w , M from about 10,000 g / mol to about 30,000 g / mol w , M from about 10,000 g / mol to about 50,000 g / mol w , M from about 30,000 g / mol to about 70,000 g / mol w , M from about 50,000 g / mol to about 90,000 g / mol w , M from about 70,000 g / mol to about 120,000 g / mol w , M from about 50,000 g / mol to about 150,000 g / mol w or M from about 80,000 g / mol to about 150,000 g / mol w When the organopolysiloxane in component (A) includes at least two, three, or four organopolysiloxanes having different molecular weights, any combination of the above values ​​may be used.

[0087] For example, when the organopolysiloxane in component (A) includes at least two organopolysiloxanes having different molecular weights, the first organopolysiloxane may have an M of about 50,000 g / mol to about 150,000 g / mol. w , and the second organopolysiloxane may have an M of about 10,000 g / mol to about 50,000 g / mol. w If present, the third organopolysiloxane may have an M of about 500 g / mol to about 10,000 g / mol. w .

[0088] ii. Component (B)

[0089] The curable organopolysiloxane foam-forming composition comprises (B) 3 to 70 parts by weight of an organopolysiloxane having at least an average of 1.5 silicon-bonded hydrogen atoms in its molecules.

[0090] Component (B) in the curable organopolysiloxane composition is a crosslinking agent and is an organopolysiloxane having at least an average of 1.5 silicon-bonded hydrogen atoms in the molecule. For example, the organopolysiloxane may have at least an average of 2 silicon-bonded hydrogen atoms in the molecule. The bonding site of the silicon-bonded hydrogen atom may be a molecular terminal, a molecular side chain, or a molecular terminal and a molecular side chain. Examples of silicon-bonded groups other than hydrogen atoms include substituted or unsubstituted monovalent hydrocarbon groups such as methyl, ethyl, propyl, butyl, pentyl and hexyl groups; alkenyl groups such as vinyl, allyl, butenyl, pentenyl, hexenyl and heptenyl groups; aryl groups such as phenyl, tolyl and xylyl groups; aralkyl groups such as benzyl and phenethyl groups; and halogenated alkyl groups such as 3-chloropropyl and 3,3,3-trifluoropropyl groups and alkoxysilylalkyl groups such as trimethoxysilylethyl, methyldimethoxysilylethyl, triethoxysilylethyl and trimethoxysilylpropyl groups; alkoxy groups such as methoxy, ethoxy, propoxy and glycidoxyalkyl groups such as glycidoxypropyl and glycidoxybutyl groups. Examples of the molecular structure of the organopolysiloxane having at least an average of 1.5 silicon-bonded hydrogen atoms in the molecule include a linear structure, a partially branched linear structure, a branched structure, a network structure, and a dendritic structure. The organopolysiloxane having at least an average of 1.5 silicon-bonded hydrogen atoms in the molecule may be a mixture of two or more types of organopolysiloxanes having these molecular structures. The viscosity of the organopolysiloxane having at least an average of 1.5 silicon-bonded hydrogen atoms in the molecule may be in the range of 1 to 500,000 mPa·s, such as in the range of 1 to 1,000 mPa·s at 25°C.

[0091] Examples of the organopolysiloxane having at least an average of 1.5 silicon-bonded hydrogen atoms in the molecule include, but are not limited to, methylhydrogenpolysiloxane end-capped at both molecular ends with trimethylsiloxy groups, dimethylsiloxane-methylhydrogensiloxane copolymer end-capped at both molecular ends with trimethylsiloxy groups, methylhydrogensiloxane-methylphenylsiloxane copolymer end-capped at both molecular ends with trimethylsiloxy groups, dimethylsiloxane-methylhydrogensiloxane-methylphenylsiloxane copolymer end-capped at both molecular ends with trimethylsiloxy groups, Dimethylpolysiloxane terminated with dimethylhydrogensiloxy groups, methylhydrogenpolysiloxane terminated with dimethylhydrogensiloxy groups at both molecular ends, dimethylsiloxane-methylhydrogensiloxane copolymer terminated with dimethylhydrogensiloxy groups at both molecular ends, dimethylsiloxane-methylphenylsiloxane copolymer terminated with dimethylhydrogensiloxy groups at both molecular ends, dimethylsiloxane-methylhydrogensiloxane-methylphenylsiloxane copolymer terminated with dimethylhydrogensiloxy groups at both molecular ends, organopolysiloxane containing a unit represented by the formula: R′3SiO 1 / 2 And a unit represented by the formula: SiO 4 / 2 , an organopolysiloxane comprising a unit represented by the formula: R′ 3 / 2 , an organopolysiloxane comprising a unit represented by the formula: R′2SiO 2 / 2 and a unit represented by the formula: R′SiO 3 / 2 , an organopolysiloxane comprising a unit represented by the formula: R′2SiO 2 / 2 , a unit represented by the formula: R′SiO 3 / 2 , and a unit represented by the following formula: SiO 4 / 2, methylhydrogensiloxane-methyl (trimethoxysilylethyl) siloxane copolymers terminated at both molecular ends with trimethylsiloxy groups, methylhydrogensiloxane-methyl (trimethoxysilylethyl) siloxane-methyl (3-glycidoxypropyl) siloxane copolymers terminated at both molecular ends with trimethylsiloxy groups, dimethylsiloxane-methylhydrogensiloxane-methyl (trimethoxysilylethyl) siloxane copolymers terminated at both molecular ends with trimethylsiloxy groups, dimethylsiloxane-methylhydrogensiloxane-methyl (trimethoxysilylethyl) siloxane copolymers terminated at both molecular ends with trimethylsiloxy groups, Siloxyl group-terminated methylhydrogensiloxane-methyl(triethoxysilylethyl)siloxane copolymers, methylhydrogensiloxane-methyl(triethoxysilylethyl)siloxane-methyl(3-glycidoxypropyl)siloxane copolymers terminated with trimethylsiloxy groups at both molecular ends, dimethylsiloxane-methylhydrogensiloxane-methyl(trimethoxysilylethyl)siloxane copolymers terminated with trimethylsiloxy groups at both molecular ends, dimethylsiloxane-methylhydrogensiloxane-methyl(triethoxysilylethyl)siloxane copolymers terminated with trimethylsiloxy groups at both molecular ends, and mixtures of two or more types of these organopolysiloxanes. R′ in the above formula is a substituted or unsubstituted monovalent hydrocarbon group, examples of which include the alkyl group, alkenyl group, aryl group, aralkyl group or halogenated alkyl group described above. In one aspect, due to the mechanical characteristics (especially elongation) of the cured product formed from the composition of the present invention, the organopolysiloxane having at least an average of 1.5 silicon-bonded hydrogen atoms in the molecule may be a mixture of an organopolysiloxane having silicon-bonded hydrogen atoms only at both molecular terminals and an organopolysiloxane having at least 3 silicon-bonded hydrogen atoms in the molecule.

[0092] In one aspect, the organopolysiloxane in component (B) is a hydride-terminated organopolysiloxane, an organopolysiloxane with hydride pendant groups, or an organopolysiloxane terminated with hydride pendant groups. For example, the organopolysiloxane in component (B) can be a hydride-terminated organopolysiloxane. In another aspect, the organopolysiloxane in component (B) can be an organopolysiloxane with hydride pendant groups. In yet another aspect, the organopolysiloxane in component (B) can be an organopolysiloxane terminated with hydride pendant groups.

[0093] The content of the organopolysiloxane having at least 1.5 silicon-bonded hydrogen atoms on average in the molecule may be such an amount that the number of silicon-bonded hydrogen atoms in the organopolysiloxane having at least 1.5 silicon-bonded hydrogen atoms on average in the molecule is 1:1 per 1 mol of the average unit formula R a SiO (4-a) / 2 The alkenyl groups in the organopolysiloxane represented are in the range of 0.05 to 20 mol, for example in the range of 0.1 to 20 mol, and such as in the range of 0.1 to 10 mol.

[0094] Component (B) is present in 1 to 70 parts by weight. For example, component (B) may be present in 1 to 50 parts by weight, 1 to 40 parts by weight, 1 to 30 parts by weight, 1 to 25 parts by weight, 1 to 20 parts by weight, 1 to 15 parts by weight, 3 to 70 parts by weight, 3 to 50 parts by weight, 3 to 40 parts by weight, 5 to 40 parts by weight, 3 to 30 parts by weight, 3 to 25 parts by weight, 3 to 20 parts by weight, 3 to 15 parts by weight, 5 to 70 parts by weight, 10 to 70 parts by weight, 15 to 70 parts by weight, 20 to 70 parts by weight, 30 to 70 parts by weight, 5 to 30 parts by weight, 10 to 50 parts by weight, or 10 to 30 parts by weight.

[0095] iii. Component (C)

[0096] The curable organopolysiloxane foam-forming composition comprises (C) 0.1 to 50 parts by weight of a blowing agent.

[0097] The foaming agent can be a hydroxyl-containing compound selected from the group consisting of: a polyol, a monofunctional alcohol, an organosilane containing a silanol group, an organosiloxane containing a silanol group, and water. The foaming agent can also include a mixture of such compounds. The hydroxyl groups on the foaming agent react with some of the silicon-bonded hydrogen of component (B) described herein to produce hydrogen (H2), thereby forming pores in the foam.

[0098] When the foaming agent includes a polyol, it can be an organic alcohol having 3 to 12 carbon atoms and containing an average of at least two hydroxyl groups per molecule. The carbon chain constituting the backbone of the polyol can be linear or branched, or can have aromatic rings that are not directly bonded to the hydroxyl groups. Useful polyols include saturated polyols having at least two hydroxyl groups per molecule. For example, Weise teaches saturated polyols in U.S. Pat. No. 4,871,781, the teaching of which is incorporated herein by reference for saturated polyols as foaming agents. Examples of aliphatic polyols are diols such as 1,2-ethanediol, 2,3-propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol and 1,6-hexanediol; 1,2,3-propanetriol; 2,2-bis-hydroxymethyl-1-butanol; tetraols such as erythritol and pentaerythritol (2,2-bis-hydroxymethyl-1,3-propanediol); pentanols such as arabitol, xylitol and methylpentitol; hexitols such as mannitol and sorbitol; and alicyclic polyols such as cyclohexanediol, cyclohexanetriol and inositol.

[0099] In one aspect, the polyol is a diol. Suitable diols include, but are not limited to, 1,2 ethylene glycol, 1,4-butanediol, 1,5-pentanediol, and 1,7-heptanediol. Sufficient polyol is used to generate the amount of hydrogen required for the foaming process to produce a suitable foam.

[0100] When the foaming agent comprises a monofunctional alcohol, it can be an organic alcohol containing 1 to 12 carbon atoms and one hydroxyl group per molecule. The carbon chain constituting the backbone of the organic alcohol can be straight, branched, or can have an aromatic ring that is not directly bonded to the hydroxyl group. This optional monofunctional alcohol differs from a polyol in that the monofunctional alcohol cannot contain an average of more than one hydroxyl group per molecule. The amount of the optional monofunctional alcohol required to reduce the foam density of the present invention depends on the composition of the foam-forming composition and the monofunctional alcohol used. Examples of monofunctional alcohols include methanol, ethanol, n-propanol, isopropanol, n-butanol, 2-butanol, tert-butanol, n-octanol and benzyl alcohol.

[0101] When the blowing agent is an organosilane containing a silanol group, it includes, for example, compounds represented by the general formulae (1) and (2):

[0102]

[0103] (1) and (2)

[0104] Where R 3 It is a substituted or unsubstituted monovalent hydrocarbon containing no aliphatic unsaturated bonds. 3Can include alkyl groups with 1 to 6 carbon atoms, such as methyl groups, ethyl groups and propyl groups; cycloalkyl groups with 6 to 10 carbon atoms, such as cyclohexyl groups; aryl groups with 6 to 10 carbon atoms, such as phenyl groups and tolyl groups; aralkyl groups with 7 to 12 carbon atoms, such as benzyl groups, 2-phenylethyl groups and 1-phenylpropyl groups; and any of these groups in which at least one hydrogen atom has been replaced by a halogen atom (e.g., 3,3,3-trifluoropropyl groups). In one aspect, R 3 is methyl. 3 The groups represented may all be the same or may be different from each other. Examples of such organosilanes are the following compounds:

[0105]

[0106] When the foaming agent is an organosiloxane containing a silanol group, it includes, for example, a compound represented by the general formula (3):

[0107] (3)

[0109] R 3 As defined above, and a is an integer from 0 to about 50, preferably from about 1 to about 50, and more preferably from about 3 to about 20.

[0110] When the blowing agent is water, it is added in an amount of about 100 parts per million to 1.5 parts by weight of water based on 100 parts of component (A). For example, Modic teaches the use of water as a blowing agent for silicone foams in U.S. Pat. No. 4,289,545, which is hereby incorporated by reference for its teachings on the use of water as a blowing agent. Water can be added so that the silicon-bonded hydrogen in component (B) is 0.2:1 to 50:1 mole / mole water. For example, the ratio of silicon-bonded hydrogen to water can be 1:1 to 5:1.

[0111] Component (C) is present in 0.1 to 50 parts by weight. For example, component (C) can be present in 0.1 to 40 parts by weight, 0.1 to 30 parts by weight, 0.1 to 25 parts by weight, 0.1 to 20 parts by weight, 0.1 to 15 parts by weight, 0.5 to 50 parts by weight, 5 to 50 parts by weight, 10 to 50 parts by weight, 15 to 50 parts by weight, 20 to 50 parts by weight, 30 to 50 parts by weight, 0.5 to 40 parts by weight, 0.5 to 30 parts by weight, 5 to 40 parts by weight, 5 to 30 parts by weight, 3 to 20 parts by weight or 5 to 20 parts by weight. The amount of component (C) can be such that the number of silicon-bonded hydrogen atoms in component (C) is 0.05 to 20 mol of alkenyl groups per 1 mol of component (A).

[0112] iv. Component (D)

[0113] The curable organopolysiloxane foam-forming composition comprises (D) 0.00001 to 20 parts by weight of particles comprising:

[0114] i. platinum group catalysts; and

[0115] ii. Having a T of at least 20°C g or a thermoplastic polymer with a controlled molecular weight having a softening temperature, the thermoplastic polymer with a controlled molecular weight being selected from the group consisting of:

[0116] 1. Having an M of about 500 g / mol to about 30,000 g / mol w and a polydispersity index (PDI) of less than 2, polystyrene or copolymers thereof;

[0117] 2. Having an M of about 500 g / mol to about 30,000 g / mol w and polymethyl methacrylate or copolymers thereof having a PDI of less than 2;

[0118] 3. Having an M of about 500 g / mol to about 30,000 g / mol w and polyacrylonitrile or a copolymer thereof having a PDI of less than 2;

[0119] The platinum group catalyst is completely encapsulated in the thermoplastic polymer.

[0120] The molecular weight controlled thermoplastic polymer used in the disclosed particles has a narrow molecular weight and a narrow polydispersity index (PDI), which allows for lower and more defined activation temperatures when the particles are used in a curable organopolysiloxane composition. It is desirable to tailor the activation temperature to a specific application. In addition, because the particles have a narrow molecular weight and a narrow PDI, the repeatability of the particles is improved, meaning that each batch of particles behaves almost the same in terms of activation temperature. A large PDI (e.g., greater than 2) can cause the activation temperature of each batch of particles to be significantly different, which makes the particles more difficult to predict.

[0121] The catalyst is a hydrosilylation catalyst. In one aspect, the platinum group catalyst is selected from the group consisting of platinum (Pt), palladium (Pd), ruthenium (Ru), rhodium (Rh), osmium (Os), iridium (Ir), and any combination thereof. For example, the platinum group catalyst can be platinum. In another example, the platinum group catalyst can be palladium. In yet another example, the platinum group catalyst can be ruthenium. In yet another example, the platinum group catalyst can be rhodium. In yet another example, the platinum group catalyst can be osmium. In yet another example, the platinum group catalyst can be iridium. Non-limiting specific hydrosilylation reaction catalysts include platinum black, platinum-loaded alumina powder, platinum-loaded silica powder, platinum-loaded carbon powder, chloroplatinic acid, alcohol solutions of chloroplatinic acid, complexes of platinum and olefins, complexes of platinum and alkenylsiloxanes such as divinyltetramethyldisiloxane, and catalysts prepared by further diluting the complex of platinum and alkenylsiloxane with alkenylsiloxane, siloxane oligomers, etc.; palladium-based catalysts, such as tetrakis(triphenylphosphine)palladium; rhodium-based catalysts.

[0122] When the encapsulated Pt catalyst developed in WO2021 / 113470 is formulated into a silicone foam composition, physical isolation of the Pt catalyst from the silicone hydride and the foaming agent can be provided, thereby eliminating H2 formation during sample storage and mixing stages. Such compositions generally have a long shelf life and can be cured on demand depending on the applied temperature. In particular, encapsulated Pt catalysts with lower and different activation temperatures can be used to fine-tune the release of the Pt catalyst during the foaming process to form hydrogen, thereby overcoming processing barriers in conventional silicone compositions and creating new potential applications for silicone foams.

[0123] In one aspect, the particles include about 0.01% to about 50% by weight of a platinum group catalyst. For example, the particles may include about 0.01% to about 40% by weight of a platinum group catalyst. In another example, the particles may include about 0.01% to about 30% by weight of a platinum group catalyst. In yet another example, the particles may include about 0.1% to about 50% by weight of a platinum group catalyst. In yet another example, the particles may include about 0.1% to about 40% by weight of a platinum group catalyst. In yet another example, the particles may include about 0.1% to about 30% by weight of a platinum group catalyst. In yet another example, the particles may include about 0.1% to about 20% by weight of a platinum group catalyst. In yet another example, the particles may include about 0.1% to about 10% by weight of a platinum group catalyst. In another example, the particles may include about 1% to about 10% by weight of a platinum group catalyst. In yet another example, the particles may include about 2% to about 10% by weight of a platinum group catalyst. In another example, the particles can include about 10 wt % to about 50 wt % of a platinum group catalyst. In yet another example, the particles can include about 20 wt % to about 50 wt % of a platinum group catalyst.

[0124] In one aspect, the molecular weight controlled thermoplastic polymer may have a T of at least 30°C. Tg Or softening temperature. For example, a thermoplastic polymer with controlled molecular weight may have a T of at least 40°C. Tg In another example, the molecular weight controlled thermoplastic polymer may have a T of at least 50°C. Tg In yet another example, the molecular weight controlled thermoplastic polymer may have a T of at least 60°C. Tg In yet another example, the molecular weight controlled thermoplastic polymer may have a T of at least 70°C. Tg In yet another example, the molecular weight controlled thermoplastic polymer may have a T of at least 80°C. Tg In yet another example, the molecular weight controlled thermoplastic polymer may have a T of at least 90°C. Tg In yet another example, the molecular weight controlled thermoplastic polymer may have a T of 20°C to 100°C. g In yet another example, the molecular weight controlled thermoplastic polymer may have a T of 30°C to 100°C. g Or softening temperature. ° C. In yet another example, the molecular weight controlled thermoplastic polymer may have a T of 30°C to 180°C. g In yet another example, the molecular weight controlled thermoplastic polymer may have a T of 50°C to 100°C. gIn yet another example, the molecular weight controlled thermoplastic polymer may have a T of 70°C to 100°C. g In yet another example, the molecular weight controlled thermoplastic polymer may have a T of 20°C to 80°C. g In yet another example, the molecular weight controlled thermoplastic polymer may have a T of 20°C to 60°C. g In yet another example, the molecular weight controlled thermoplastic polymer may have a T of 55°C to 75°C. g In yet another example, the molecular weight controlled thermoplastic polymer may have a T of 75°C to 95°C. g or softening temperature.

[0125] In one aspect, the molecular weight controlled thermoplastic polymer may have a molecular weight of at least 20°C. Tg Temperature. For example, a molecular weight controlled thermoplastic polymer may have a T of at least 40°C. g In another example, the molecular weight controlled thermoplastic polymer may have a T of at least 50°C. g In yet another example, the molecular weight controlled thermoplastic polymer may have a T of at least 60°C. g In yet another example, the molecular weight controlled thermoplastic polymer may have a T of at least 70°C. g In yet another example, the molecular weight controlled thermoplastic polymer may have a T of at least 80°C. g In yet another example, the molecular weight controlled thermoplastic polymer may have a T of at least 90°C. g In yet another example, the molecular weight controlled thermoplastic polymer may have a T of 20°C to 100°C. g In yet another example, the molecular weight controlled thermoplastic polymer may have a T of 30°C to 100°C. g In yet another example, the molecular weight controlled thermoplastic polymer may have a T of 30°C to 180°C. g In yet another example, the molecular weight controlled thermoplastic polymer may have a T of 50°C to 100°C. g In yet another example, the molecular weight controlled thermoplastic polymer may have a T of 70°C to 100°C. g In yet another example, the molecular weight controlled thermoplastic polymer may have a T of 20°C to 80°C. g In yet another example, the molecular weight controlled thermoplastic polymer may have a T of 20°C to 60°C. g In yet another example, the molecular weight controlled thermoplastic polymer may have a T of 55°C to 75°C. gIn yet another example, the molecular weight controlled thermoplastic polymer may have a T of 75°C to 95°C. g .

[0126] In one aspect, the molecular weight controlled thermoplastic polymer may have a softening temperature of at least 20°C. For example, the molecular weight controlled thermoplastic polymer may have a softening temperature of at least 40°C. In another example, the molecular weight controlled thermoplastic polymer may have a softening temperature of at least 50°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a softening temperature of at least 60°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a softening temperature of at least 70°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a softening temperature of at least 80°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a softening temperature of at least 90°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a softening temperature of 20°C to 100°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a softening temperature of 30°C to 100°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a softening temperature of 30°C to 180°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a softening temperature of 50°C to 100°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a softening temperature of 70°C to 100°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a softening temperature of 20°C to 80°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a softening temperature of 20°C to 60°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a softening temperature of 55°C to 75°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a softening temperature of 75°C to 95°C.

[0127] In one aspect, the molecular weight controlled thermoplastic polymer may have a melting temperature of 20°C to 180°C. For example, the molecular weight controlled thermoplastic polymer may have a melting temperature of 40°C to 100°C. In another example, the molecular weight controlled thermoplastic polymer may have a melting temperature of 50°C to 100°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a melting temperature of 60°C to 100°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a melting temperature of 30°C to 90°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a melting temperature of 30°C to 180°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a melting temperature of 30°C to 60°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a melting temperature of 60°C to 90°C. In yet another example, the molecular weight controlled thermoplastic polymer may have a melting temperature of 55°C to 75°C. In yet another example, the controlled molecular weight thermoplastic polymer can have a melting temperature of 75°C to 95°C.

[0128] In one aspect, the thermoplastic polymer is a polymer having an M of about 500 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 2. For example, the thermoplastic polymer may be a polystyrene or copolymer thereof having an M of about 500 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 1.8. In another example, the thermoplastic polymer may be a polystyrene or a copolymer thereof having an M of about 500 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 1.5. In yet another example, the thermoplastic polymer may be a polystyrene or copolymer thereof having an M of about 500 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 1.2. In yet another example, the thermoplastic polymer may be a polystyrene or copolymer thereof having an M of about 500 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 1.1 polystyrene or a copolymer thereof.

[0129] In one aspect, the thermoplastic polymer is a polymer having an M of about 1,000 g / mol to about 15,000 g / mol. w and a polydispersity index (PDI) of less than 2. For example, the thermoplastic polymer may be a polystyrene or copolymer thereof having an M of about 1,000 g / mol to about 15,000 g / mol. wand a polydispersity index (PDI) of less than 1.8. In another example, the thermoplastic polymer may be a polystyrene or a copolymer thereof having an M of about 1,000 g / mol to about 15,000 g / mol. w and a polydispersity index (PDI) of less than 1.5. In yet another example, the thermoplastic polymer may be a polystyrene or copolymer thereof having an M of about 1,000 g / mol to about 15,000 g / mol. w and a polydispersity index (PDI) of less than 1.2. In yet another example, the thermoplastic polymer may be a polystyrene or a copolymer thereof having an M of about 1,000 g / mol to about 15,000 g / mol. w and a polydispersity index (PDI) of less than 1.1 polystyrene or a copolymer thereof.

[0130] In one aspect, the thermoplastic polymer is a polymer having an M of about 15,000 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 2. For example, the thermoplastic polymer may be a polystyrene or copolymer thereof having an M of about 15,000 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 1.8. In another example, the thermoplastic polymer may be a polystyrene or a copolymer thereof having an M of about 15,000 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 1.5. In yet another example, the thermoplastic polymer may be a polystyrene or copolymer thereof having an M of about 15,000 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 1.2. In yet another example, the thermoplastic polymer may be a polystyrene or copolymer thereof having an M of about 15,000 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 1.1 polystyrene or a copolymer thereof.

[0131] In one aspect, the thermoplastic polymer is polystyrene. In another aspect, the thermoplastic polymer is a copolymer of polystyrene. The limiting examples of the copolymer of polystyrene include styrene-butadiene copolymer, styrene-isoprene copolymer, styrene-ethylene-butylene copolymer, styrene-N-vinyl pyrrolidone copolymer, styrene-acrylonitrile copolymer, acrylonitrile-butadiene-styrene (ABS) copolymer, styrene-allyl alcohol copolymer and styrene-maleic anhydride copolymer.

[0132] In one aspect, the thermoplastic polymer is a polymer having an M of about 500 g / mol to about 30,000 g / mol.w and a polydispersity index (PDI) of less than 2. For example, the thermoplastic polymer may be a polymethyl methacrylate or a copolymer thereof having a PDI of about 500 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 1.8. In another example, the thermoplastic polymer may be a polymethyl methacrylate or a copolymer thereof having an M of about 500 g / mol to about 30,000 g / mol. w and polymethyl methacrylate or a copolymer thereof having a polydispersity index (PDI) of less than 1.5. In yet another example, the thermoplastic polymer may be a polymer having an M of about 500 g / mol to about 30,000 g / mol. w and polymethyl methacrylate or a copolymer thereof having a polydispersity index (PDI) of less than 1.2. In yet another example, the thermoplastic polymer may have an M of about 500 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 1.1.

[0133] In one aspect, the thermoplastic polymer is a polymer having an M of about 1,000 g / mol to about 15,000 g / mol. w and a polydispersity index (PDI) of less than 2. For example, the thermoplastic polymer may be a polymethyl methacrylate or a copolymer thereof having a PDI of about 1,000 g / mol to about 15,000 g / mol. w and a polydispersity index (PDI) of less than 1.8. In another example, the thermoplastic polymer may be a polymethyl methacrylate or a copolymer thereof having a PDI of about 1,000 g / mol to about 15,000 g / mol. w and a polydispersity index (PDI) of less than 1.5. In yet another example, the thermoplastic polymer may be a polymethyl methacrylate or a copolymer thereof having an M of about 1,000 g / mol to about 15,000 g / mol. w and a polydispersity index (PDI) of less than 1.2. In yet another example, the thermoplastic polymer may be a polymethyl methacrylate or a copolymer thereof having an M of about 1,000 g / mol to about 15,000 g / mol. w and a polydispersity index (PDI) of less than 1.1.

[0134] In one aspect, the thermoplastic polymer is a polymer having an M of about 15,000 g / mol to about 30,000 g / mol. wand a polydispersity index (PDI) of less than 2. For example, the thermoplastic polymer may be a polymethyl methacrylate or a copolymer thereof having a PDI of about 15,000 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 1.8. In another example, the thermoplastic polymer may be a polymethyl methacrylate or a copolymer thereof having a PDI of about 15,000 g / mol to about 30,000 g / mol. w and polymethyl methacrylate or a copolymer thereof having a polydispersity index (PDI) of less than 1.5. In yet another example, the thermoplastic polymer may have an M of about 15,000 g / mol to about 30,000 g / mol. w and polymethyl methacrylate or a copolymer thereof having a polydispersity index (PDI) of less than 1.2. In yet another example, the thermoplastic polymer may have an M of about 15,000 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 1.1.

[0135] In one aspect, the thermoplastic polymer is polymethyl methacrylate. In another aspect, the thermoplastic polymer is a copolymer of polymethyl methacrylate. The limiting examples of polymethyl methacrylate copolymers include polymethyl methacrylate-styrene copolymers, polymethyl methacrylate-acrylate copolymers, and polymethyl methacrylate and a copolymer of a polymethacrylate with a side group (such as, one or more n-butyl or n-hexyl groups).

[0136] In one aspect, the thermoplastic polymer is a polymer having an M of about 500 g / mol to about 30,000 g / mol. w and polyacrylonitrile or a copolymer thereof having a polydispersity index (PDI) of less than 2. For example, the thermoplastic polymer may have a M of about 500 g / mol to about 30,000 g / mol. w and polyacrylonitrile or a copolymer thereof having a polydispersity index (PDI) of less than 1.8. In another example, the thermoplastic polymer may have an M of about 500 g / mol to about 30,000 g / mol. w and polyacrylonitrile or a copolymer thereof having a polydispersity index (PDI) of less than 1.5. In yet another example, the thermoplastic polymer may have an M of about 500 g / mol to about 30,000 g / mol. w and polyacrylonitrile or a copolymer thereof having a polydispersity index (PDI) of less than 1.2. In yet another example, the thermoplastic polymer may have an M of about 500 g / mol to about 30,000 g / mol. wand a polydispersity index (PDI) of less than 1.1, polyacrylonitrile or a copolymer thereof.

[0137] In one aspect, the thermoplastic polymer is a polymer having an M of about 1,000 g / mol to about 15,000 g / mol. w and polydispersity index (PDI) of less than 2. For example, the thermoplastic polymer may have a M of about 1,000 g / mol to about 15,000 g / mol. w and polyacrylonitrile or a copolymer thereof having a polydispersity index (PDI) of less than 1.8. In another example, the thermoplastic polymer may have an M of about 1,000 g / mol to about 15,000 g / mol. w and polyacrylonitrile or a copolymer thereof having a polydispersity index (PDI) of less than 1.5. In yet another example, the thermoplastic polymer may have an M of about 1,000 g / mol to about 15,000 g / mol. w and polyacrylonitrile or a copolymer thereof having a polydispersity index (PDI) of less than 1.2. In yet another example, the thermoplastic polymer may have an M of about 1,000 g / mol to about 15,000 g / mol. w and a polydispersity index (PDI) of less than 1.1, polyacrylonitrile or a copolymer thereof.

[0138] In one aspect, the thermoplastic polymer is a polymer having an M of about 15,000 g / mol to about 30,000 g / mol. w and polydispersity index (PDI) of less than 2. For example, the thermoplastic polymer may have a M of about 15,000 g / mol to about 30,000 g / mol. w and polyacrylonitrile or a copolymer thereof having a polydispersity index (PDI) of less than 1.8. In another example, the thermoplastic polymer may have an M of about 15,000 g / mol to about 30,000 g / mol. w and polyacrylonitrile or a copolymer thereof having a polydispersity index (PDI) of less than 1.5. In yet another example, the thermoplastic polymer may have an M of about 15,000 g / mol to about 30,000 g / mol. w and polyacrylonitrile or a copolymer thereof having a polydispersity index (PDI) of less than 1.2. In yet another example, the thermoplastic polymer may have an M of about 15,000 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 1.1, polyacrylonitrile or a copolymer thereof.

[0139] In one aspect, the thermoplastic polymer is polyacrylonitrile. In another aspect, the thermoplastic polymer is a copolymer of polyacrylonitrile. Non-limiting examples of copolymers of polyacrylonitrile include polyacrylonitrile-butadiene copolymers and polyacrylonitrile-butadiene-styrene (ABS) copolymers.

[0140] In one aspect, the particles have an average particle size of about 0.01 μm to about 500 μm. For example, it is possible to have an average particle size of about 0.01 μm to about 300 μm. In another example, it is possible to have an average particle size of about 0.01 μm to about 150 μm. In yet another example, it is possible to have an average particle size of about 0.01 μm to about 100 μm. In yet another example, it is possible to have an average particle size of about 0.01 μm to about 80 μm. In yet another example, it is possible to have an average particle size of about 0.01 μm to about 50 μm. In yet another example, it is possible to have an average particle size of about 0.01 μm to about 30 μm. In yet another example, it is possible to have an average particle size of about 0.01 μm to about 20 μm. In yet another example, it is possible to have an average particle size of about 1 μm to about 30 μm. In yet another example, it is possible to have an average particle size of about 100 μm to about 300 μm. In yet another example, the average particle size may be about 100 μm to about 500 μm.

[0141] The particles disclosed herein can be prepared by emulsion technology. For example, a platinum group catalyst and a thermoplastic polymer can be added to an oil / water system. The system can be sheared to cause the formation of micelles. The solvent can be removed to solidify the micelles. The micelles can be filtered, washed and dried.

[0142] The particles disclosed herein can also be prepared using spray drying techniques. For example, a platinum group catalyst and a thermoplastic polymer can be added to a solvent system. The solvent system dissolves the thermoplastic polymer. The particles can then be prepared by spraying the solvent system in an aerosol form. The particles can be washed and dried.

[0143] Component (D) is present in an amount of 0.00001 to 20 parts by weight. For example, component (D) may be present in an amount of 0.01 to 20 parts by weight, 0.01 to 10 parts by weight, 0.1 to 20 parts by weight, 1 to 20 parts by weight, 0.1 to 15 parts by weight, 0.1 to 10 parts by weight, 0.00001 to 10 parts by weight, 0.00001 to 5 parts by weight, 3 to 8 parts by weight, 1 to 10 parts by weight, 5 to 15 parts by weight, or 0.00001 to 1 part by weight.

[0144] In one aspect, particles disclosed herein exist in an amount that can effectively promote the crosslinking of curable organopolysiloxane foam formation composition by hydrosilylation reaction. For example, based on the gross weight of curable organopolysiloxane foam formation composition, particles disclosed herein can exist with 0.05 wt % to 5 wt %. In another example, based on the gross weight of curable organopolysiloxane foam formation composition, particles disclosed herein can exist with 0.5 wt % to 5 wt %. In another example, based on the gross weight of curable organopolysiloxane foam formation composition, particles disclosed herein can exist with 1 wt % to 5 wt %. In another example, based on the gross weight of curable organopolysiloxane foam formation composition, particles disclosed herein can exist with 3 wt % to 5 wt %. In another example, based on the gross weight of curable organopolysiloxane foam formation composition, particles disclosed herein can exist with 0.05 wt % to 3 wt %. In yet another example, the particles disclosed herein may be present at 0.05 wt % to 1 wt % based on the total weight of the curable organopolysiloxane foam-forming composition. In yet another example, the particles disclosed herein may be present at 0.05 wt % to 0.5 wt % based on the total weight of the curable organopolysiloxane foam-forming composition.

[0145] v. Component (E)

[0146] Component (E) is an optional component in the curable organopolysiloxane foam-forming composition.When present, the curable organopolysiloxane foam-forming composition further comprises (E) greater than 0 to 100 parts by weight of an organosilicon resin, wherein the organosilicon resin is different from component (A).

[0147] Silicone resins can be identified according to the abbreviated nomenclature system known to those of ordinary skill in the art, the "MDTQ" nomenclature. Under this nomenclature system, silicones are described according to the presence of the various siloxane monomer units that make up the silicone. In short, the symbol M represents the monofunctional unit (CH3)3SiO 0.5 ; D represents a difunctional unit (CH3)2SiO; T represents a trifunctional unit (CH3)SiO 1.5 ; Q represents a tetrafunctional unit SiO2. Primers in unit symbols (e.g., M′, D′, T′, and Q′) represent substituents other than methyl and must be specifically defined each time they occur. Typical alternative substituents include groups such as vinyl, phenyl, amine, hydroxyl, and the like. The molar ratios of the various units, either in the form of symbolic subscripts representing the total number of each type of unit in the silicone (or its average), or in the form of specifically specified ratios in combination with molecular weight, form the description of the silicone material under the MDTQ system. Higher relative molar amounts of T, Q, T′ and / or Q′ to D, D′, M and / or M′ in the silicone resin indicate a higher level of crosslinking.

[0148] Suitable silicone resins in component (E) include, but are not limited to, MQ, MT, MTQ, MDT, MDTQ, MDQ, DT, DTQ, or DQ resins. In one aspect, methyl is a silicone resin substituent. In another aspect, the silicone resin is an MQ silicone resin.

[0149] When present, component (E) is present in an amount of greater than 0 to 100 parts by weight. For example, component (E) may be present in an amount of greater than 0 to 90 parts by weight, greater than 0 to 80 parts by weight, greater than 0 to 70 parts by weight, greater than 0 to 60 parts by weight, greater than 0 to 50 parts by weight, greater than 0 to 40 parts by weight, greater than 0 to 30 parts by weight, greater than 0 to 20 parts by weight, greater than 0 to 10 parts by weight, greater than 0 to 5 parts by weight, 5 to 10 parts by weight, 5 to 20 parts by weight, 5 to 30 parts by weight, 5 to 40 parts by weight, 5 to 50 parts by weight, 5 to 60 parts by weight, 5 to 70 parts by weight, 5 to 80 parts by weight, 5 to 90 parts by weight, or 5 to 100 parts by weight.

[0150] vi. Component (F)

[0151] Component (F) is an optional component in the curable organopolysiloxane foam-forming composition. When present, the curable organopolysiloxane foam-forming composition further comprises (F) greater than 0 to 150 parts by weight of an organosilicon matrix comprising an organosilicon polymer containing at least one alkenyl group, wherein the organosilicon matrix is ​​different from component (A).

[0152] The silicone matrix containing the silicone polymer containing at least one alkenyl group provides high heat resistance to the resulting cured foam. Examples of the silicone polymer containing at least one alkenyl group include, but are not limited to, polysiloxanes having a linear structure containing at least one alkenyl group, polysiloxanes containing at least one alkenyl group at the end of the molecule, and cyclic siloxane compounds containing at least one alkenyl group.

[0153] Non-limiting examples of the polysiloxane having a linear structure containing at least one alkenyl group include a copolymer of a dimethylsiloxane unit, a methylvinylsiloxane unit and a terminal trimethylsiloxy unit, a copolymer of a diphenylsiloxane unit, a methylvinylsiloxane unit and a terminal trimethylsiloxy unit, a copolymer of a methylphenylsiloxane unit, a methylvinylsiloxane unit and a terminal trimethylsiloxy unit, and a polysiloxane terminally capped with a dimethylvinylsilyl group.

[0154] Non-limiting examples of the polysiloxane comprising at least one alkenyl group at the terminal of the molecule include the polysiloxane exemplified above whose terminal is blocked by a dimethylalkenyl group, and a polysiloxane comprising a dimethylalkenylsiloxane unit and at least one siloxane unit selected from the group consisting of a SiO2 unit, a SiO 3 / 2 unit and SiO unit.

[0155] Non-limiting examples of cyclic siloxane compounds containing at least one alkenyl group include 1,3,5,7-vinyl-1,3,5,7-tetramethylcyclotetrasiloxane, 1-propyl-3,5,7-trivinyl-1,3,5,7-tetramethylcyclotetrasiloxane, 1,5-divinyl-3,7-dihexyl-1,3,5,7-tetramethylcyclotetrasiloxane, 1,3,5-trivinyl-1,3,5-trimethylcyclosiloxane, 1,3,5,7,9-pentaveinyl-1,3,5,7,9-pentamethylcyclosiloxane, and 1,3,5,7,9,11-hexavinyl-1,3,5,7,9,11-hexamethylcyclosiloxane.

[0156] The at least one alkenyl group may be, for example, a vinyl group, an allyl group, a butenyl group, a pentenyl group, a hexenyl group, an octenyl group, a cyclohexenyl group, or any combination thereof.

[0157] In one aspect, component (F) comprises silica and an organosilicon polymer comprising at least one alkenyl group.

[0158] Component (F) is present in an amount of greater than 0 to 150 parts by weight. For example, component (F) can be present in an amount of greater than 0 to 140 parts by weight, greater than 0 to 130 parts by weight, greater than 0 to 120 parts by weight, greater than 0 to 110 parts by weight, greater than 0 to 100 parts by weight, greater than 0 to 90 parts by weight, greater than 0 to 80 parts by weight, greater than 0 to 70 parts by weight, greater than 0 to 60 parts by weight, greater than 0 to 50 parts by weight, greater than 0 to 40 parts by weight, greater than 0 to 30 parts by weight, greater than 0 to 20 parts by weight, greater than 0 to 10 parts by weight. The present invention relates to an aqueous solution of at least 1,4-dimethylformamide, and at least 1,4-dimethylformamide. The aqueous solution of at least 1,4-dimethylformamide is present in an amount of at least 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75

[0159] vii. Fillers, treatment agents and / or surfactants

[0160] Fillers are optional components in the curable organopolysiloxane foam-forming composition.When present, the curable organopolysiloxane foam-forming composition further comprises from greater than 0 parts by weight to 150 parts by weight of a filler.

[0161] In one aspect, the filler can be an inorganic filler. The filler is non-reactive in the curable organopolysiloxane foam-forming composition. Non-limiting examples of fillers include organic silica fillers such as silica, fumed silica, colloidal silica, precipitated silica, crystalline quartz, and diatomaceous earth; carbon fillers such as carbon black, carbon fibers, carbon nanotubes, graphite, graphene, and reduced graphite oxide; metal oxides such as titanium dioxide, aluminum oxide, iron oxide, zinc oxide, and indium tin oxide; metals such as silver and gold; calcium carbonate; microspheres such as glass microspheres; and boron nitride.

[0162] The filler can be pre-treated or in-situ treated with a treating agent, such as silazanes (hexamethyldisilazane, divinyltetramethyldisilazane, etc.), cyclic silazanes (dimethylcyclic silazane, 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasilazane, etc.), chlorosilanes (trimethylchlorosilane, dimethyldichlorosilane, dimethylvinylsilane, etc.) and low molecular weight silicone oils (octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, etc.).

[0163] The filler can be present in an amount greater than 0 to 150 parts by weight. For example, the filler can be present in an amount of 10 to 150 parts by weight, 25 to 150 parts by weight, 50 to 150 parts by weight, 75 to 150 parts by weight, 100 to 150 parts by weight, 25 to 100 parts by weight, 50 to 100 parts by weight, 10 to 125 parts by weight, 25 to 125 parts by weight, greater than 0 to 100 parts by weight, greater than 0 to 50 parts by weight, or greater than 0 to 25 parts by weight.

[0164] The treating agent may optionally be present in an amount of greater than 0 to 150 parts by weight. For example, the filler may be present in an amount of 10 to 150 parts by weight, 25 to 150 parts by weight, 50 to 150 parts by weight, 75 to 150 parts by weight, 100 to 150 parts by weight, 25 to 100 parts by weight, 50 to 100 parts by weight, 10 to 125 parts by weight, 25 to 125 parts by weight, greater than 0 to 100 parts by weight, greater than 0 to 50 parts by weight, or greater than 0 to 25 parts by weight.

[0165] Surfactant can be optionally present with greater than 0 weight portion to 150 weight portions.For example, filler can be with 10 to 150 weight portions, 25 to 150 weight portions, 50 to 150 weight portions, 75 to 150 weight portions, 100 to 150 weight portions, 25 to 100 weight portions, 50 to 100 weight portions, 10 to 125 weight portions, 25 to 125 weight portions, greater than 0 to 100 weight portions, greater than 0 to 50 weight portions or greater than 0 to 25 weight portions.Surfactant can be anionic, cationic, nonionic or amphoteric, or their mixture.Suitable anionic organic washing surfactant comprises alkali metal soap, alkyl aryl sulfonate of higher fatty acid, for example dodecylbenzene sulfonate, long chain (fat) alcohol sulfate, olefin sulfate and sulfonate, sulfated monoglyceride, sulfated ester, sulfosuccinate, alkyl sulfonate, phosphoric acid ester, alkyl isothiosulfonate, sucrose ester and fluorosurfactant.

[0166] Suitable cationic organic detersive surfactants include alkylamine salts, quaternary ammonium salts, sulfonium salts and phosphonium salts.

[0167] Suitable nonionic detersive surfactants include condensates of ethylene oxide with long chain (fatty) alcohols or (fatty) acids, for example, C14-15 alcohols ( 45-7), condensation products of ethylene oxide with amines or amides, condensation products of ethylene and propylene oxide, fatty acid amides and fatty amine oxides.

[0168] Suitable amphoteric organic detersive surfactants include imidazoline compounds, alkyl amino acid salts and betaines.

[0169] viii. Component (G)

[0170] Component (G) is an optional component in the curable organopolysiloxane foam-forming composition. When component (G) is present, the curable organopolysiloxane foam-forming composition further comprises (G) greater than 0 parts to 100 parts of a non-functional fluid.

[0171] Non-functional fluids can be used to adjust the physical properties (e.g., viscoelasticity, density, elastic modulus) of foams. Non-limiting examples of non-functional fluids include dimethylsiloxane polymers terminated with trimethylsiloxy groups at both molecular ends, methylphenylsiloxane polymers terminated with trimethylsiloxy groups at both molecular ends, dimethylsiloxane-methylphenylsiloxane copolymers terminated with trimethylsiloxy groups at both molecular ends, methylphenyl polysiloxane terminated with triethylsiloxy groups at both molecular ends, and dimethylsiloxane-diphenylsiloxane copolymers terminated with trimethylsiloxy groups at both molecular ends.

[0172] Non-functional fluid can exist with greater than 0 weight portion to 100 weight portions.For example, non-functional fluid can exist with 1 to 100 weight portion, 5 to 100 weight portion, 10 to 100 weight portion, 20 to 100 weight portion, 30 to 100 weight portion, 40 to 100 weight portion, 50 to 100 weight portion, 60 to 100 weight portion, 70 to 100 weight portion, 80 to 100 weight portion, 90 to 100 weight portion, 0 to 90 weight portion, 0 to 80 weight portion, 0 to 70 weight portion, 0 to 60 weight portion, 0 to 50 weight portion, 0 to 40 weight portion, 0 to 30 weight portion, 0 to 20 weight portion, 0 to 10 weight portion, 1 to 50 weight portion, 1 to 30 weight portion, 1 to 20 weight portion, 5 to 30 weight portion or 10 to 20 weight portions.

[0173] ix. Reaction inhibitors

[0174] Reaction inhibitors are optional components in the curable organopolysiloxane foam-forming composition. When present, the curable organopolysiloxane foam-forming composition further comprises greater than 0 to 5 parts by weight, such as greater than 0 to 10 parts by weight.

[0175] Reaction inhibitors slow down and control the reaction caused when the catalyst contacts the components in the curable organopolysiloxane foam-forming composition. For example, the reaction inhibitor can interact with the catalyst to reduce the activity of the catalyst. Non-limiting examples of reaction inhibitors include acetylene alcohols, such as 1-ethynyl-1-cyclohexanol, 2-methyl-3-butyn-2-ol, 2-phenyl-3-butyn-2-ol, 2-ethynyl isopropanol, 2-ethynyl butan-2-ol and 3,5-dimethyl-1-hexyn-3-ol; silylated acetylene alcohols, such as trimethyl (3,5-dimethyl-1-hexyn-3-oxy) silane, methylvinylbis (3-methyl-1-butyn-3-oxy) silane and ((1,1-dimethyl-2-propargyl) oxy) trimethylsilane; unsaturated carboxylic acid esters, such as maleic acid dimethicone, ... allyl esters, dimethyl maleate, diethyl fumarate, diallyl fumarate and bis(methoxyisopropyl) maleate; conjugated ene-yne ​​compounds such as 2-isobutyl-1-butene-3-yne, 3,5-dimethyl-3-hexene-1-yne, 3-methyl-3-pentene-1-yne, 3-methyl-3-hexene-1-yne, 1-ethynylcyclohexene, 3-ethyl-3-butene-1-yne and 3-phenyl-3-butene-1-yne; and cyclic siloxanes containing alkenyl groups such as 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane.

[0176] The reaction inhibitor may be present in an amount of greater than 0 to 10 parts by weight. For example, the reaction inhibitor may be present in an amount of greater than 0.5 to 10 parts by weight, 1 to 10 parts by weight, 3 to 10 parts by weight, 5 to 10 parts by weight, greater than 0.5 to 8 parts by weight, 0.5 to 6 parts by weight, or 0.05 to 4 parts by weight.

[0177] In one aspect, the curable organopolysiloxane foam-forming composition can be a homogeneous mixture of all components present in the curable organopolysiloxane foam-forming composition. For example, the curable organopolysiloxane foam-forming composition can be a homogeneous mixture of organopolysiloxanes represented by the following average unit formula: a SiO (4-a) / 2 , an organopolysiloxane having at least an average of 1.5 silicon-bonded hydrogen atoms in the molecule, a blowing agent, and the particles disclosed herein. In one aspect, the particles disclosed herein can be uniformly dispersed with other components in a curable organopolysiloxane foam-forming composition.

[0178] The curable organopolysiloxane foam-forming composition may be prepared by mixing the components of the curable organopolysiloxane foam-forming composition and activating the catalyst by applying heat to soften or melt the thermoplastic polymer encapsulating the catalyst in the particles.

[0179] C.Organic polysiloxane foam

[0180] Also disclosed herein is an organopolysiloxane foam. The organopolysiloxane foam may be produced from the curable organopolysiloxane foam-forming composition disclosed herein.

[0181] Also disclosed is an organopolysiloxane foam having a controlled molecular weight thermoplastic polymer dispersed throughout the organopolysiloxane foam, the controlled molecular weight thermoplastic polymer having a T of at least 20°C. g or softening temperature, wherein the molecular weight controlled thermoplastic polymer is selected from the group consisting of:

[0182] a) having an M of about 500 g / mol to about 30,000 g / mol w and a polydispersity index (PDI) of less than 2, polystyrene or copolymers thereof;

[0183] b) having an M of about 500 g / mol to about 30,000 g / mol w and polymethyl methacrylate or copolymers thereof having a PDI of less than 2; or

[0184] c) having an M of about 500 g / mol to about 30,000 g / mol w and polyacrylonitrile or a copolymer thereof having a PDI of less than 2.

[0185] The controlled molecular weight thermoplastic polymer in the organopolysiloxane foam may have the properties described elsewhere herein.

[0186] D.Methods:

[0187] Also disclosed herein is a method of using the curable organopolysiloxane foam-forming composition disclosed herein. Disclosed herein is a method of producing an organopolysiloxane foam, the method comprising the following steps:

[0188] a) providing a curable organopolysiloxane foam-forming composition disclosed herein; and

[0189] b) heating the curable organopolysiloxane foam-forming composition to a temperature effective to soften or melt the thermoplastic polymer to release the platinum group catalyst, thereby promoting the reaction to produce the organopolysiloxane foam.

[0190] In one aspect, the temperature effective to soften the thermoplastic polymer is from about 30°C to about 180°C. For example, the temperature effective to soften the thermoplastic polymer may be from about 40°C to about 100°C. In another example, the temperature effective to soften the thermoplastic polymer is from about 60°C to about 90°C. In another example, the temperature effective to soften the thermoplastic polymer is from about 55°C to about 75°C. In another example, the temperature effective to soften the thermoplastic polymer is from about 75°C to about 95°C. In another example, the temperature effective to soften the thermoplastic polymer is from about 100°C to about 180°C. In another example, the temperature effective to soften the thermoplastic polymer is from about 80°C to about 150°C. When the thermoplastic polymer softens, the platinum group catalyst is exposed to the organopolysiloxane component of the curable organopolysiloxane composition to cure the curable organopolysiloxane composition.

[0191] In one aspect, the temperature at which the thermoplastic polymer can be effectively melted is from about 30°C to about 180°C. For example, the temperature at which the thermoplastic polymer can be effectively melted can be from about 40°C to about 100°C. In another example, the temperature at which the thermoplastic polymer can be effectively melted is from about 60°C to about 90°C. In another example, the temperature at which the thermoplastic polymer can be effectively melted is from about 55°C to about 75°C. In another example, the temperature at which the thermoplastic polymer can be effectively melted is from about 75°C to about 95°C. In another example, the temperature at which the thermoplastic polymer can be effectively melted is from about 100°C to about 180°C. In another example, the temperature at which the thermoplastic polymer can be effectively melted is from about 80°C to about 150°C. When the thermoplastic polymer is melted, the platinum group catalyst is exposed to the organopolysiloxane component of the curable organopolysiloxane composition, causing the curable organopolysiloxane composition to cure.

[0192] In one aspect, the time period that the curing that curable organopolysiloxane foam forms composition is carried out is greater than 0 minute to 144 hours.For example, the time period that the curing that curable organopolysiloxane foam forms can be carried out is greater than 0 minute to 100 hours.In another example, the time period that the curing that curable organopolysiloxane foam forms can be carried out is greater than 10 minutes to 90 hours.In another example, the time period that the curing that curable organopolysiloxane foam forms can be carried out is greater than 10 minutes to 72 hours.In another example, the time period that the curing that curable organopolysiloxane foam forms can be carried out is greater than 10 minutes to 48 hours.In another example, the time period that the curing that curable organopolysiloxane foam forms can be carried out is greater than 10 minutes to 24 hours.In another example, the time period that the curing that curable organopolysiloxane foam forms can be carried out is 24 hours to 100 hours.In another example, the time period that the curing that curable organopolysiloxane foam forms can be carried out is 48 hours to 100 hours. In yet another example, the time period that the curing that curable organopolysiloxane foam forms can be carried out is to exceed 10 minutes to 18 hours. In yet another example, the time period that the curing that curable organopolysiloxane foam forms can be carried out is to exceed 10 minutes to 12 hours. In yet another example, the time period that the curing that curable organopolysiloxane foam forms can be carried out is to exceed 10 minutes to 6 hours. In yet another example, the time period that the curing that curable organopolysiloxane foam forms can be carried out is to exceed 10 minutes to 3 hours. In yet another example, the time period that the curing that curable organopolysiloxane foam forms can be carried out is to exceed 10 minutes to 1 hour. In yet another example, the time period that the curing that curable organopolysiloxane foam forms can be carried out is to exceed 12 hours to 72 hours. In yet another example, the time period that the curing that curable organopolysiloxane foam forms can be carried out is to exceed 24 hours to 72 hours.

[0193] In one aspect, providing the curable organopolysiloxane foam comprises applying the curable organopolysiloxane foam to a surface. In one aspect, the surface may be a surface located indoors. In another aspect, the surface may require repair.

[0194] In one aspect, providing curable organopolysiloxane foam to form includes molding, extrusion or calendering curable organopolysiloxane foam to form. For example, providing curable organopolysiloxane foam to form can include molding. In another aspect, providing curable organopolysiloxane foam to form can include extrusion. In another aspect, providing curable organopolysiloxane foam to form can include calendering.

[0195] E. Aspects

[0196] In view of the disclosure herein, certain more specific aspects of the present invention will be described below. However, these specifically enumerated aspects should not be interpreted as having any limiting effect on any different claims containing different or more general teachings described herein, or that the "particular" aspects are limited in some way that is not included in the inherent meaning of the language and formulas literally used therein.

[0197] Aspect 1: A curable organopolysiloxane foam-forming composition, the curable organopolysiloxane foam-forming composition comprising: (A) 100 parts by weight of an organopolysiloxane represented by the following average unit formula: R a SiO (4-a) / 2 , wherein R is a substituted or unsubstituted monovalent hydrocarbon group, and "a" is a number from 1.0 to 2.4, and has at least an average of 1.5 alkenyl groups in the molecule; (B) 1 to 70 parts by weight, such as 3 to 70 parts by weight, of an organopolysiloxane having at least an average of 1.5 silicon-bonded hydrogen atoms in the molecule; (C) 0.1 to 50 parts of a blowing agent; and (D) 0.00001 to 20 parts of particles, the particles comprising: i. a platinum group catalyst; and ii. a T of at least 20°C g or a molecular weight controlled thermoplastic polymer having a softening temperature, the molecular weight controlled thermoplastic polymer being selected from the group consisting of: 1. having an M of about 500 g / mol to about 30,000 g / mol; w and a polydispersity index (PDI) of less than 2, polystyrene or copolymers thereof; 2. having an M of about 500 g / mol to about 30,000 g / mol w and a polymethyl methacrylate or copolymer thereof having a PDI of less than 2; and 3. having an M of about 500 g / mol to about 30,000 g / mol w and polyacrylonitrile or a copolymer thereof having a PDI of less than 2; wherein the platinum group catalyst is completely encapsulated in the thermoplastic polymer.

[0198] Aspect 2: The curable organopolysiloxane foam-forming composition of aspect 1, wherein the curable organopolysiloxane foam-forming composition further comprises greater than 0 to 5 parts, such as greater than 0 to 10 parts, of a reaction inhibitor.

[0199] Aspect 3: The curable organopolysiloxane foam-forming composition of aspect 1 or aspect 2, wherein the curable organopolysiloxane foam-forming composition further comprises from greater than 0 parts to 150 parts of a filler.

[0200] Aspect 4: The curable organopolysiloxane foam-forming composition according to Aspect 3, wherein the filler is an inorganic filler.

[0201] Aspect 5: The curable organopolysiloxane foam-forming composition of any one of aspects 1 to 4, wherein the organopolysiloxane in component (A) comprises at least two organopolysiloxanes having different molecular weights.

[0202] Aspect 6: The curable organopolysiloxane foam-forming composition of any one of Aspects 1 to 5, wherein the curable organopolysiloxane foam-forming composition further comprises: (E) greater than 0 to 100 parts by weight of an organosilicon resin, wherein the organosilicon resin is different from component (A).

[0203] Aspect 7: A curable organopolysiloxane foam-forming composition as described in any one of Aspects 1 to 6, wherein the curable organopolysiloxane foam-forming composition further comprises: (F) greater than 0 to 150 parts by weight of an organosilicon matrix, the organosilicon matrix comprising an organosilicon polymer containing at least one alkenyl group, wherein the organosilicon matrix is ​​different from component (A).

[0204] Aspect 8: The curable organopolysiloxane foam-forming composition of aspect 6 or aspect 7, wherein the silicone resin is an MQ silicone resin.

[0205] Aspect 9: The curable organopolysiloxane foam-forming composition of aspect 6 or aspect 7, wherein E is present in an amount of greater than 0 to 60 parts by weight.

[0206] Aspect 10: The curable organopolysiloxane foam-forming composition of aspect 6 or aspect 7, wherein the organosilicon matrix comprises silicon dioxide and the organosilicon polymer comprises at least one alkenyl group.

[0207] Aspect 11: The curable organopolysiloxane foam-forming composition of aspect 7, wherein F is present in an amount of 10 to 40 parts by weight.

[0208] Aspect 12: The curable organopolysiloxane foam-forming composition of aspect 6 or aspect 7, wherein E is present in an amount of 5 to 40 parts by weight.

[0209] Aspect 13: The curable organopolysiloxane foam-forming composition of any one of Aspects 1 to 12, wherein the organopolysiloxane in part (B) is present at 5 to 40 parts by weight.

[0210] Aspect 14: The curable organopolysiloxane foam-forming composition of any of Aspects 1 to 13, wherein the blowing agent is present at 5 to 40 parts by weight.

[0211] Aspect 15: The curable organopolysiloxane foam-forming composition of any one of Aspects 1 to 14, wherein the curable organopolysiloxane foam-forming composition further comprises: greater than 0 parts to 100 parts of a non-functional fluid.

[0212] Aspect 16: The curable organopolysiloxane foam-forming composition of any of Aspects 1 to 15, wherein the particles are present at 0.01 to 10 parts by weight.

[0213] Aspect 17: The curable organopolysiloxane foam-forming composition of any one of Aspects 1 to 16, wherein the thermoplastic polymer is a polymer having an M of about 500 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 2, polystyrene or a copolymer thereof.

[0214] Aspect 18: The curable organopolysiloxane foam-forming composition of aspect 17, wherein the polystyrene or copolymer thereof has an M of about 1,000 g / mol to about 15,000 g / mol. w .

[0215] Aspect 19: The curable organopolysiloxane foam-forming composition of aspect 17 or aspect 18, wherein the polystyrene or copolymer thereof has a PDI of less than 1.5.

[0216] Aspect 20: The curable organopolysiloxane foam-forming composition of aspect 17 or aspect 18, wherein the polystyrene or copolymer thereof has a PDI of less than 1.2.

[0217] Aspect 21: The curable organopolysiloxane foam-forming composition of any one of Aspects 1 to 20, wherein the thermoplastic polymer is a polymer having an M of about 500 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 2, polymethyl methacrylate or a copolymer thereof.

[0218] Aspect 22: The curable organopolysiloxane foam-forming composition of any one of Aspects 1 to 21, wherein the polymethyl methacrylate or copolymer thereof has an M of about 1,000 g / mol to about 15,000 g / mol. w .

[0219] Aspect 23: The curable organopolysiloxane foam-forming composition of aspect 22, wherein the polymethyl methacrylate or copolymer thereof has a PDI of less than 1.5.

[0220] Aspect 24: The curable organopolysiloxane foam-forming composition of aspect 22, wherein the polymethyl methacrylate or copolymer thereof has a PDI of less than 1.2.

[0221] Aspect 25: A curable organopolysiloxane foam-forming composition as described in any one of Aspects 1 to 24, wherein the thermoplastic polymer is a polymer having an M of about 500 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 2, polyacrylonitrile or a copolymer thereof.

[0222] Aspect 26: The curable organopolysiloxane foam-forming composition of aspect 25, wherein the polyacrylonitrile or copolymer thereof has an M of about 1,000 g / mol to about 15,000 g / mol. w .

[0223] Aspect 27: The curable organopolysiloxane foam-forming composition of aspect 25, wherein the polyacrylonitrile or copolymer thereof has a PDI of less than 1.5.

[0224] Aspect 28: The curable organopolysiloxane foam-forming composition of aspect 25, wherein the polyacrylonitrile or copolymer thereof has a PDI of less than 1.2.

[0225] Aspect 29: The curable organopolysiloxane foam-forming composition of any of Aspects 1 to 28, wherein the particles have an average particle size of about 0.01 μm to about 500 μm.

[0226] Aspect 30: The curable organopolysiloxane foam-forming composition of any of Aspects 1 to 29, wherein the particles comprise from about 0.01 wt % to about 50 wt % of the platinum group catalyst.

[0227] Aspect 31: The curable organopolysiloxane foam-forming composition of any of Aspects 1 to 30, wherein the curable organopolysiloxane foam-forming composition is a one-part curable organopolysiloxane foam-forming composition.

[0228] Aspect 32: The curable organopolysiloxane foam-forming composition of any of Aspects 1 to 30, wherein the curable organopolysiloxane foam-forming composition is a two-part curable organopolysiloxane foam-forming composition.

[0229] Aspect 33: The curable organopolysiloxane foam-forming composition of any of Aspects 1 to 32, wherein component (C) is present in an amount such that the number of silicon-bonded hydrogen atoms in component (C) is 0.05 to 20 mol per 1 mol of alkenyl groups in component (A).

[0230] Aspect 34: The curable organopolysiloxane foam-forming composition of any of Aspects 1 to 33, wherein component (E) is present in an amount effective to promote crosslinking of the curable organopolysiloxane composition via a hydrosilylation reaction after release of the platinum group catalyst.

[0231] Aspect 35: The curable organopolysiloxane foam-forming composition of any of Aspects 1 to 34, wherein the curable organopolysiloxane foam-forming composition is a homogenous composition.

[0232] Aspect 36: The curable organopolysiloxane foam-forming composition of any one of Aspects 1 to 35, wherein the molecular weight controlled thermoplastic polymer has a T of 30° C. to 180° C. g or softening temperature.

[0233] Aspect 37: The curable organopolysiloxane foam-forming composition of any one of Aspects 1 to 35, wherein the molecular weight controlled thermoplastic polymer has a T of 55° C. to 75° C. g or softening temperature.

[0234] Aspect 38: The curable organopolysiloxane foam-forming composition of any one of Aspects 1 to 35, wherein the molecular weight controlled thermoplastic polymer has a T of 75° C. to 95° C. g or softening temperature.

[0235] Aspect 39: The curable organopolysiloxane foam-forming composition of any one of Aspects 1 to 38, wherein the curable organopolysiloxane foam-forming composition comprises: (A) 100 parts by weight of an organopolysiloxane represented by the following average unit formula: R a SiO (4-a) / 2 , wherein R is a substituted or unsubstituted monovalent hydrocarbon group, and "a" is a number from 1.0 to 2.4, and has at least an average of 1.5 alkenyl groups in the molecule; (B) 10 to 30 parts by weight of an organopolysiloxane having at least an average of 1.5 silicon-bonded hydrogen atoms in the molecule; (C) 5 to 20 parts of a blowing agent; (D) 0.05 to 8 parts of particles, the particles comprising: i. a platinum group catalyst; and ii. a T of at least 20°C g or a molecular weight controlled thermoplastic polymer having a softening temperature, the molecular weight controlled thermoplastic polymer being selected from the group consisting of: 1. having an M of about 500 g / mol to about 30,000 g / mol; w and a polydispersity index (PDI) of less than 2, polystyrene or copolymers thereof; 2. having an M of about 500 g / mol to about 30,000 g / mol wand a polymethyl methacrylate or copolymer thereof having a PDI of less than 2; and 3. having an M of about 500 g / mol to about 30,000 g / mol w and polyacrylonitrile or a copolymer thereof having a PDI of less than 2; wherein the platinum group catalyst is completely encapsulated in the thermoplastic polymer; (E) greater than 0 to 60 parts by weight of an organic silicone resin, wherein the silicone resin is different from component (A); and (G) greater than 0 to 100 parts of a non-functional fluid.

[0236] Aspect 40: The curable organopolysiloxane foam-forming composition of any one of Aspects 1 to 39, wherein the curable organopolysiloxane foam-forming composition comprises: (A) 100 parts by weight of an organopolysiloxane represented by the following average unit formula: R a SiO (4-a) / 2 , wherein R is a substituted or unsubstituted monovalent hydrocarbon group, and "a" is a number from 1.0 to 2.4, and has at least an average of 1.5 alkenyl groups in the molecule; (B) 5 to 30 parts by weight of an organopolysiloxane having at least an average of 1.5 silicon-bonded hydrogen atoms in the molecule; (C) 0.1 to 50 parts of a blowing agent; and (D) 0.05 to 8 parts of particles, the particles comprising: i. a platinum group catalyst; and ii. a T of at least 20°C g or a molecular weight controlled thermoplastic polymer having a softening temperature, the molecular weight controlled thermoplastic polymer being selected from the group consisting of: 1. having an M of about 500 g / mol to about 30,000 g / mol; w and a polydispersity index (PDI) of less than 2, polystyrene or copolymers thereof; 2. having an M of about 500 g / mol to about 30,000 g / mol w and a polymethyl methacrylate or copolymer thereof having a PDI of less than 2; and 3. having an M of about 500 g / mol to about 30,000 g / mol w and polyacrylonitrile or a copolymer thereof having a PDI of less than 2; wherein the platinum group catalyst is completely encapsulated in the thermoplastic polymer; (F) 10 to 40 parts by weight of an organosilicon matrix comprising an organosilicon polymer containing at least one alkenyl group, wherein the organosilicon matrix is ​​different from component (A); and (G) greater than 0 to 100 parts of a non-functional fluid.

[0237] Aspect 41: A method for producing an organopolysiloxane foam, the method comprising the steps of: a) providing a curable organopolysiloxane foam-forming composition as described in any one of Aspects 1 to 40 or 51 to 52; and b) heating the curable organopolysiloxane foam-forming composition to a temperature that is effective to soften or melt the thermoplastic polymer to release the platinum group catalyst, thereby promoting a reaction to produce the organopolysiloxane foam.

[0238] Aspect 42: The method of aspect 41, wherein the temperature effective to soften or melt the thermoplastic polymer is from about 30°C to about 180°C.

[0239] Aspect 43: The method of aspect 41, wherein the temperature effective to soften or melt the thermoplastic polymer is from about 55°C to about 75°C.

[0240] Aspect 44: The method of aspect 41, wherein the temperature effective to soften or melt the thermoplastic polymer is from about 75°C to about 95°C.

[0241] Aspect 45: The method of any of Aspects 41 to 44, wherein curing of the curable organopolysiloxane foam-forming composition is carried out for a period of time ranging from greater than 0 minutes to 144 hours.

[0242] Aspect 46: The method of any of Aspects 41 to 45, wherein providing a curable organopolysiloxane composition comprises applying the curable organopolysiloxane foam-forming composition to a surface.

[0243] Aspect 47: The method of any of Aspects 41 to 46, wherein providing the curable organopolysiloxane foam-forming composition comprises molding, extruding, or calendering the curable organopolysiloxane composition.

[0244] Aspect 48: An organopolysiloxane foam having a T of at least 20° C. dispersed throughout the organopolysiloxane foam. g or a softening temperature of about 500 g / mol to about 30,000 g / mol; w and a polydispersity index (PDI) of less than 2; b) having an M of about 500 g / mol to about 30,000 g / mol; w and a PDI of less than 2 polymethyl methacrylate or copolymer thereof; or c) having an M of about 500 g / mol to about 30,000 g / mol w and polyacrylonitrile or a copolymer thereof having a PDI of less than 2.

[0245] Aspect 49: The organopolysiloxane foam of aspect 48, wherein the organopolysiloxane foam is produced from the curable organopolysiloxane foam-forming composition of any of aspects 1 to 40 or 51 to 52.

[0246] Aspect 50: The curable organopolysiloxane foam-forming composition of any of Aspects 1 to 40, wherein the organopolysiloxane in (A) is an alkenyl-terminated organopolysiloxane, an organopolysiloxane with alkenyl pendant groups, or an alkenyl-terminated organopolysiloxane with alkenyl pendant groups.

[0247] Aspect 51: The curable organopolysiloxane foam-forming composition of any one of Aspects 1 to 40 and 51, wherein the organopolysiloxane in (B) is a hydride-terminated organopolysiloxane, an organopolysiloxane with hydride pendant groups, or an organopolysiloxane terminated and with hydride pendant groups.

[0248] F. Examples

[0249] The following examples are provided to provide a person of ordinary skill in the art with a complete disclosure and description of the preparation and evaluation methods of the compounds, compositions, products, devices and / or methods described and discussed herein, and are intended to be examples of the present invention only, and are not intended to limit the scope of their invention as considered by the inventors. Efforts have been made to ensure the accuracy of numerical values ​​(e.g., amounts, temperatures, etc.), but some errors and deviations should be considered. Unless otherwise specified, parts are weight parts, temperatures are ° C or ambient temperature, and pressures are at or close to atmospheric pressure. There are multiple variations and combinations of reaction conditions (e.g., component concentrations, desired solvents, solvent mixtures, temperatures, pressures, and other reaction ranges) and conditions that can be used to optimize the product purity and yield obtained by the process. Only reasonable routine experiments are required to optimize these process conditions.

[0250] The examples provided herein illustrate the preparation of non-limiting exemplary particles disclosed herein using molecular weight controlled polystyrene (PS) and molecular weight controlled poly(methyl methacrylate) (PMMA). Encapsulated Pt particles were prepared using an emulsion method and a spray drying method. Both methods serve the same purpose for particle preparation and should not be limited to a specific thermoplastic polymer. Examples 1 and 2 are preparations of encapsulated Pt particles using molecular weight controlled PS. Example 3 is the preparation of encapsulated Pt particles using a molecular weight controlled PMMA by a spray drying process.

[0251] i. Example 1 (encapsulated Pt sample A prepared using PS with controlled molecular weight)

[0252] Add 400 g of dichloromethane into the flask, and then add 15 g of low molecular weight PS (M w=1800 Daltons, PDI=1.04). The solution was stirred with a magnetic stirrer until the polystyrene was dissolved, and then 3.0 g of a solution of Karstedt catalyst in isopropanol (Pt content of about 3 wt%) was added to the solution and mixed until uniform. In a separate flask to which 600 g of deionized water was added, 15 g of polyvinyl alcohol (PVA) was added and mixed until the solution was clear in appearance. 350 mL of PVA solution and 200 mL of deionized water were added to a 3-neck 12L flask equipped with a pneumatic stirring rod, a thermocouple, a condenser, and a heating jacket. The stirring rod was started, and then 180 mL of the above-mentioned dichloromethane solution was added dropwise. After the addition was complete, 900 mL of deionized water was added to the emulsion mixture. The flask was then purged with nitrogen (N2) (2 liters / minute), and the mixture was then gradually heated to 40°C over 4 hours, and kept under N2 purge for another 6 hours. The final mixture was milky white, and particles were precipitated at the bottom of the flask. The microparticles were then separated by centrifugation (3500 rpm), washed with isopropanol and deionized water, and finally dried under vacuum at room temperature.

[0253] ii. Example 2 (Encapsulated P prepared using PS with controlled molecular weight T Sample B)

[0254] The same method as described in Example 1 was used, but with different molecular weight polystyrenes. 400 g of dichloromethane was added to the flask, followed by 15 g of low molecular weight PS (M w =4000 Dalton, PDI=1.04). The solution was stirred with a magnetic stirrer until the polystyrene was dissolved, and then 3.0g of a solution of Karstedt catalyst in isopropanol (Pt content of about 3 wt%) was added to the solution and mixed until uniform. In a separate flask to which 600g of deionized water was added, 15g of PVA was added and mixed until the solution was clear in appearance. 350mL of PVA solution and 200mL of deionized water were added to a 3-neck 12L flask equipped with a pneumatic stirring rod, a thermocouple, a condenser, and a heating jacket. The stirring rod was started, and then 180mL of the above-mentioned dichloromethane solution was added dropwise. After the addition was complete, 900mL of deionized water was added to the emulsion mixture. The flask was then purged with N2 (2 liters / minute), and the mixture was then gradually heated to 40°C over 4 hours, and kept under N2 purge for another 6 hours. The final mixture was milky white, and particles were precipitated at the bottom of the flask. The microparticles were then separated by centrifugation (3500 rpm), washed with isopropanol and deionized water, and finally dried under vacuum at room temperature.

[0255] iii. Example 3 (encapsulated P prepared using conventional PS T Sample C)

[0256] The same method as described in Example 1 was used, but with polystyrene having a molecular weight and PDS outside the range of the particles disclosed herein. 400 g of dichloromethane was added to the flask, followed by 15 g of conventional PS (M w =350 kDa, PDI=2.2). The solution was stirred with a magnetic stirrer until the polystyrene was dissolved, and then 3.0 g of a solution of Karstedt's catalyst in isopropanol (Pt content of about 3 wt%) was added to the solution and mixed until uniform. In a separate flask to which 600 g of deionized water was added, 15 g of PVA was added and mixed until the solution was clear in appearance. 350 mL of PVA solution and 200 mL of deionized water were added to a 3-neck 12L flask equipped with a pneumatic stirring rod, a thermocouple, a condenser, and a heating jacket. The stirring rod was started, and then 180 mL of the above-mentioned dichloromethane solution was added dropwise. After the addition was complete, 900 mL of deionized water was added to the emulsion mixture. The flask was then purged with N2 (2 liters / minute), and the mixture was then gradually heated to 40°C over 4 hours and kept under N2 purge for another 6 hours. The final mixture was milky white, and particles were precipitated at the bottom of the flask. The microparticles were then separated by centrifugation (3500 rpm), washed with isopropanol and deionized water, and finally dried under vacuum at room temperature.

[0257] iv. Example 4. Silicone foam composition prepared using catalyst sample A

[0258] The encapsulated catalyst of Sample A of Example 1 was tested in a silicone foam composition comprising polydimethylsiloxane (PDMS) end-capped at both ends with dimethylvinylsiloxy groups having a viscosity of 100,000 cP at 25°C (32.3 wt%), polydimethylsiloxane (PDMS) end-capped at both ends with dimethylvinylsiloxy groups having a viscosity of 35,000 cP at 25°C (33.1 wt%), a silicone matrix (14.5 wt%), a polymethylhydrogensiloxane (10-45 cSt) crosslinker (11.2 wt%), an encapsulated Pt catalyst (2.0 wt%), and a pentanediol foaming agent (6.7 wt%). The silicone matrix is ​​composed of dimethylvinylsiloxy end-capped polydimethylsiloxane (4k cP, 73 wt%) and fumed silica (surface area 200 m2) treated with hexamethyldisilazane (2 wt%). 2 / g, 25 wt%). The above-mentioned uniformly mixed composition can be packaged in two parts. Part A usually contains PDMS polymer, silicone matrix, foaming agent and catalyst A, and part B usually contains PDMS polymer, silicone matrix and cross-linking agent. The composition can also be packaged into one part containing all the above ingredients. The resulting composition has a usable life of more than 3 weeks at 40°C. The composition is cured at 65°C, 85°C, 100°C and 150°C for 20 minutes respectively. It is partially cured at 65°C, but is completely cured at 85°C, 100°C and 150°C to form a silicone foam with uniform fine pores (diameter of about 1 mm or less).

[0259] v. Example 5. Silicone foam composition prepared using catalyst sample B

[0260] The encapsulated catalyst of Sample B of Example 2 was tested in a silicone foam composition comprising polydimethylsiloxane (PDMS) end-capped with dimethylvinylsiloxy groups at both ends (32.3 wt%) with a viscosity of 100,000 cP at 25°C, polydimethylsiloxane (PDMS) end-capped with dimethylvinylsiloxy groups at both ends (33.1 wt%) with a viscosity of 35,000 cP at 25°C, a silicone matrix (14.5 wt%), a polymethylhydrogensiloxane (10-45 cSt) crosslinker (11.2 wt%), an encapsulated Pt catalyst (2.0 wt%), and a pentanediol foaming agent (6.7 wt%). The silicone matrix is ​​composed of dimethylvinylsiloxy end-capped polydimethylsiloxane (4k cP, 73 wt%) and fumed silica (surface area 200 m2) treated with hexamethyldisilazane (2 wt%). 2 / g, 25 wt%). The above uniformly mixed composition can be packaged in two parts, wherein part A generally contains PDMS polymer, silicone matrix, foaming agent and catalyst A, and part B generally contains PDMS polymer, silicone matrix and crosslinking agent. The composition can also be packaged into one part containing all the above ingredients. The resulting composition has a shelf life of more than 3 weeks at 40°C. The composition is cured at 65°C, 85°C, 100°C and 150°C for 20 minutes respectively. It does not cure at 65°C, but is completely cured at 85°C, 100°C and 150°C to form a silicone foam with uniform fine pores (about 1 mm in diameter).

[0261] vi. Example 6. Silicone foam composition prepared using catalyst sample C

[0262] The encapsulated catalyst of Sample C of Example 3 was tested in a silicone foam composition comprising polydimethylsiloxane (PDMS) end-capped at both ends with dimethylvinylsiloxy groups having a viscosity of 100,000 cP at 25°C (32.3 wt%), polydimethylsiloxane (PDMS) end-capped at both ends with dimethylvinylsiloxy groups having a viscosity of 35,000 cP at 25°C (33.1 wt%), a silicone matrix (14.5 wt%), a polymethylhydrogensiloxane (10-45 cSt) crosslinker (11.2 wt%), an encapsulated Pt catalyst (2.0 wt%), and a pentanediol foaming agent (6.7 wt%). The silicone matrix is ​​composed of dimethylvinylsiloxy end-capped polydimethylsiloxane (4k cP, 73 wt%) and fumed silica (surface area 200 m2) treated with hexamethyldisilazane (2 wt%). 2 / g, 25 wt%). The above uniformly mixed composition can be packaged in two parts, wherein part A generally contains PDMS polymer, silicone matrix, foaming agent and sample A, wherein part B generally contains PDMS polymer, silicone matrix and cross-linking agent. The composition can also be packaged into one part containing all the above ingredients. The resulting composition has a shelf life of more than 3 weeks at 40°C. The composition is cured at 65°C, 85°C, 100°C and 150°C for 20 minutes respectively. It is not cured at 65°C and 85°C, partially cured at 100°C, and completely cured at 150°C to form a silicone foam with uniform fine pores (about 1 mm in diameter).

[0263] Table 1

[0264]

[0265] Encapsulated catalysts can be used in silicone foam systems (Examples 4-6) to drive the foaming reaction at various temperatures ranging from 65° C. to 150° C. The encapsulated catalysts successfully prevented curing and hydrogen formation at room temperature for all three variants (Samples AC), and the temperature at which the materials cured was significantly different between each catalyst, as shown in Table 1, with Sample A curing at the lowest temperature tested and Catalyst C curing at the highest temperature tested.

[0266] It is obvious to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the present invention. In view of the specification and practice of the present invention disclosed herein, other aspects of the present invention will be apparent to those skilled in the art. The specification and examples are intended to be considered as exemplary only, and the true scope and spirit of the present invention are indicated by the appended claims.

Claims

1. A curable organopolysiloxane foam-forming composition, comprising: (A) 100 parts by weight of an organopolysiloxane represented by the following average unit formula: R a SiO (4-a) / 2 in, R is a substituted or unsubstituted monovalent hydrocarbon group, and "a" is a number from 1.0 to 2.4, and there are at least an average of 1.5 alkenyl groups in the molecule; (B) 1 to 70 parts by weight of an organopolysiloxane having an average of at least 1.5 silicon-bonded hydrogen atoms in its molecules; (C) 0.1 to 50 parts by weight of a foaming agent; and (D) 0.00001 to 20 parts by weight of particles, the particles comprising: i. platinum group catalysts; and ii. Having a T of at least 20°C g or a thermoplastic polymer with a controlled molecular weight having a softening temperature, the thermoplastic polymer with a controlled molecular weight being selected from the group consisting of:

1. Having an M of about 500 g / mol to about 30,000 g / mol w and a polydispersity index (PDI) of less than 2, polystyrene or copolymers thereof; 2. Having an M of about 500 g / mol to about 30,000 g / mol w and polymethyl methacrylate or copolymers thereof having a PDI of less than 2; as well as 3. Having an M of about 500 g / mol to about 30,000 g / mol w and polyacrylonitrile or a copolymer thereof having a PDI of less than 2; wherein the platinum group catalyst is completely encapsulated in the thermoplastic polymer.

2. The curable organopolysiloxane foam-forming composition of claim 1, wherein the organopolysiloxane in (A) is an alkenyl-terminated organopolysiloxane, an organopolysiloxane with alkenyl pendant groups, or an organopolysiloxane with alkenyl-terminated and alkenyl pendant groups.

3. The curable organopolysiloxane foam-forming composition of claim 1, wherein the organopolysiloxane in (B) is a hydride-terminated organopolysiloxane, an organopolysiloxane with hydride pendant groups, or an organopolysiloxane that is hydride-terminated and has hydride pendant groups.

4. The curable organopolysiloxane foam-forming composition of claim 1, wherein the curable organopolysiloxane foam-forming composition further comprises greater than 0 parts by weight to 5 parts by weight of a reaction inhibitor.

5. The curable organopolysiloxane foam-forming composition of claim 1, wherein the curable organopolysiloxane foam-forming composition further comprises from greater than 0 parts by weight to 150 parts by weight of a filler, a treating agent or a surfactant, or a combination thereof.

6. The curable organopolysiloxane foam-forming composition of claim 3, wherein the filler is an inorganic filler.

7. The curable organopolysiloxane foam-forming composition of claim 1, wherein the organopolysiloxane in part (B) is present in 5 to 40 parts by weight.

8. The curable organopolysiloxane foam-forming composition of claim 1, wherein the blowing agent is present in an amount of 5 to 40 parts by weight.

9. The curable organopolysiloxane foam-forming composition of claim 1, wherein the particles are present in an amount of 0.01 to 10 parts by weight.

10. The curable organopolysiloxane foam-forming composition of claim 1, wherein the thermoplastic polymer is a polymer having an M of from about 500 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 2, polystyrene or a copolymer thereof.

11. The curable organopolysiloxane foam-forming composition of claim 10, wherein the polystyrene or copolymer thereof has an M of from about 500 g / mol to about 15,000 g / mol. w and a PDI of less than 1.

2.

12. The curable organopolysiloxane foam-forming composition of claim 1, wherein the thermoplastic polymer is a polymer having an M of from about 500 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 2, polymethyl methacrylate or a copolymer thereof.

13. The curable organopolysiloxane foam-forming composition of claim 12, wherein the polymethyl methacrylate or copolymer thereof has an M of about 500 g / mol to about 15,000 g / mol. w and a PDI of less than 1.

2.

14. The curable organopolysiloxane foam-forming composition of claim 1, wherein the thermoplastic polymer is a polymer having an M of from about 500 g / mol to about 30,000 g / mol. w and a polydispersity index (PDI) of less than 2, polyacrylonitrile or a copolymer thereof.

15. The curable organopolysiloxane foam-forming composition of claim 14, wherein the polyacrylonitrile or copolymer thereof has an M of from about 500 g / mol to about 15,000 g / mol. w and a PDI of less than 1.

2.

16. The curable organopolysiloxane foam-forming composition of claim 1, wherein the particles have an average particle size of about 0.01 μm to about 100 μm.

17. The curable organopolysiloxane foam-forming composition of claim 1, wherein the particles comprise from about 0.01 wt% to about 20 wt% of the platinum group catalyst.

18. The curable organopolysiloxane foam-forming composition of claim 1, wherein the curable organopolysiloxane foam-forming composition is a one-part curable organopolysiloxane foam-forming composition.

19. The curable organopolysiloxane foam-forming composition of claim 1, wherein the curable organopolysiloxane foam-forming composition is a two-part curable organopolysiloxane foam-forming composition.

20. The curable organopolysiloxane foam-forming composition of claim 1, wherein the curable organopolysiloxane foam-forming composition is a homogeneous composition.

21. The curable organopolysiloxane foam-forming composition of claim 1, wherein the molecular weight controlled thermoplastic polymer has a T of 30°C to 120°C. g or softening temperature.

22. A method for producing an organopolysiloxane foam, the method comprising the steps of: a) providing a curable organopolysiloxane foam-forming composition as claimed in any one of claims 1 to 23; as well as b) heating the curable organopolysiloxane foam-forming composition to a temperature effective to soften or melt the thermoplastic polymer to release the platinum group catalyst, thereby promoting a reaction to produce the organopolysiloxane foam.

23. The method of claim 22, wherein the temperature effective to soften or melt the thermoplastic polymer is from about 30°C to about 150°C.

24. The method of claim 22, wherein curing of the curable organopolysiloxane foam-forming composition is carried out for a period of time ranging from greater than 0 minutes to 144 hours.

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