5717results about "Polyureas/polyurethane adhesives" patented technology

Fast curing surgical adhesives and sealants contain an NCO-terminated hydrophilic urethane prepolymer derived from an aromatic diisocyanate and a polyol. Substantially all the aromatic diisocyanate used to prepare the NCO-terminated hydrophilic urethane prepolymer is in the para form. Optionally, the aromatic diisocyanate is substituted with at least one electron withdrawing group, such as, for example, a fluorine group.

A transformable pressure sensitive adhesive composition comprised of from about 15 to about 80% by weight of a polymer having a softening point greater than 60° C.; from about 20 to about 85% by weight of a polymerizable resin having a softening point less than 30° C.; a latent initiator in an amount sufficient to cause a reaction between said polymer and said resin; and optionally, a crosslinking agent. The transformable pressure sensitive adhesive has particular applicability in connection with organic light emitting diode display devices, light emitting diode display devices, medical diagnostic testing devices, flexible or rigid LCD display devices, plasma display devices, and electrochromic devices.

An electro-optic display comprises first and second substrates and a lamination adhesive layer and a layer of a solid electro-optic material disposed between the first and second substrates, the lamination adhesive layer having a volume resistivity, measured at 10° C., which does not change by a factor of more than about 3 after being held at 25° C. and 45 percent relative humidity for 1000 hours. The electro-optic material is preferably an encapsulated electrophoretic material. Other desirable characteristics of lamination adhesives for use in electro-optic displays are also described.

The invention is an epoxy resin based adhesive composition comprising an epoxy resin and a compound comprising an elastomeric prepolymer residue selected from the group of a polyurethane, a polyurea and a polyurea polyurethane having isocyanate end groups, the isocyanate end groups of said prepolymer residue being capped by a capping compound selected from the group consisting of a primary aliphatic, cycloaliphatic, heteroaromatic and araliphatic amine, a secondary aliphatic, cycloaliphatic, aromatic, heteroaromatic and araliphatic amine, a thiol and an alkyl amide, said capping compound being bound to the end of the polymer chain of the elastomeric prepolymer in a manner such that the end to which it is bonded no longer has a reactive group. In addition to the capping compound defined above above, a capping compound selected from the group consisting of a phenol and a polyphenol can be used for capping the isocyanate end groups of the prepolymer residue

An electro-optic assembly comprises an adhesive layer and a layer of electro-optic material. The adhesive layer comprises a polymeric adhesive material and an ionic material having either its cation or its anion fixed to the polymeric adhesive material. The ionic material reduces the volume resistivity of the polymeric adhesive material and is not removed upon heating to 50° C. In a similar electro-optic assembly comprising an adhesive layer and a layer of electro-optic material, the adhesive layer comprises a polymeric adhesive material which has been subjected to dialysis or diafiltration to remove organic species having a molecular weight less than about 3,500, so that the adhesive material has a content of N-methylpyrrolidone not exceeding 500 ppm based upon the total weight of the adhesive layer and layer of electro-optic material.

The invention discloses a weather-resistant and high thermal conductive coating, a radiating solar rear panel and an efficient solar cell panel. The weather-resistant and high thermal conductive coating consists of 10 to 50 parts of weather-resistant resin, 5 to 30 parts of curing agent, 0.1 to 5 parts of organic filler, 30 to 80 parts of inorganic filler, and 30 to 100 parts of solvent. The radiating solar rear panel comprises a base layer, and the weather-resistant and high thermal conductive coating is arranged on at least one surface of the base layer or arranged between the base layers. The efficient solar cell panel comprises a solar front panel and the radiating solar rear panel, a solar cell circuit is arranged between the solar front panel and the radiating solar rear panel, and an encapsulation material is arranged on one side or two sides of the solar cell circuit. The weather-resistant and high thermal conductive coating can be directly coated on a base material and has high binding power and an excellent thermal conductive effect, and the weather resistance of the coating meets the requirement of a solar module for the service life of over 25 years.

Absorbable polyurethanes, polyamides and polyester urethanes prepared from at least one compound selected from:

or the diamines and diisocyanates thereof, wherein each X represents a member independently selected from —CH₂COO— (glycolic acid moiety), —CH(CH₃)COO— (lactic acid moiety), —CH₂CH₂OCH₂COO— (dioxanone), —CH₂CH₂CH₂CH₂CH₂COO— (caprolactone moiety), —(CH₂)_yCOO— where y is one of the numbers 2, 3, 4 or 6-24 inclusive, and —(CH₂CH₂O)_z′CH₂COO— where z′ is an integer between 2 and 24, inclusive; each Y represents a member independently selected from —COCH₂O— (glycolic ester moiety), —COCH(CH₃)O— (lactic ester moiety), —COCH₂OCH₂CH₂O— (dioxanone ester), —COCH₂CH₂CH₂CH₂CH₂O— (caprolactone ester), —CO(CH₂)_mO— where m is an integer between 2, 3, 4 or 6-24 inclusive, —COCH₂O(CH₂CH₂O)_n— where n is an integer between 2 and 24, inclusive; R′ is hydrogen, benzyl or an alkyl group, the alkyl group being either straight-chained or branched; p is an integer between 1 and 4, inclusive; and Rn represents one or more members selected from H, alkoxy, benzyloxy, aldehyde, halogen, carboxylic acid and —NO₂, which is attached directly to an aromatic ring or attached through an aliphatic chain. Absorbable polymers prepared from these compounds are useful for drug delivery, tissue engineering, tissue adhesives, adhesion prevention and other implantable medical devices.

Curable pressure sensitive adhesive compositions comprising an acrylate copolymer, a mono-acrylate oligomer, a multi-acrylate oligomer having from 2 to 5 acrylate functional groups per molecule, and a photoinitiator, the adhesive exhibiting pressure sensitive adhesive characteristics and forms at least a semi-interpenetrating polymer network when cured; wherein the semi-IPN has an average molecular weight between crosslinks (M_c) greater than about 3000, and the cured adhesive has a peel strength greater than about 40 N/dm. Embodiments of the adhesive compositions, when cured, are optically clear and resistant to heat and moisture.

Bioabsorbable compounds which include a polyalkylene oxide backbone with two or more isocyanate substituents are useful as one component adhesives. Absorbable compositions useful as a two component adhesive contain a) a polyethylene oxide having two or more amine substituents with b) a bioabsorbable diisocyanate compound, or alternatively contain a) a polyethylene oxide having two or more isocyanate substituents with b) a bioabsorbable diamine compound, or, alternatively contain a) a bioabsorbable diisocyanate compound and b) a bioabsorbable diamine compound.

A polyurethane is produced by reacting at least components A and B, where a) a polyisocyanate or mixture of polyisocyanates is used as component A and b) a polyol or mixture of polymer is used as component B. Component B contains at least one polyether having a number average molecular weight of at least 4000 and a polydispersity of less than 1.5 and/or an OH functionality of between about 1.8 and about 2. Preparations containing such polyurethanes are useful as adhesives, coatings and sealants.

The present invention relates to compositions which contain at least one epoxide adduct A having on average more than one epoxide group per molecule, at least one polymer B of the formula (I), at least one thixotropic agent C, based on a urea derivative in a nondiffusing carrier material, and at least one curing agent D for epoxy resins, which is activated by elevated temperature. This composition serves in particular as an adhesive and has an extremely high dynamic resistance to cleavage, in particular at low temperatures. The invention furthermore relates to impact strength modifiers terminated with epoxide groups and of the formula (I). It has been found that these novel impact strength modifiers result in a significant increase in impact strength in epoxy resin compositions, in particular in two-component epoxy resin compositions.

The invention relates to an aqueous binder which is compounded and modified by micro nano material. The modified aqueous binder of the invention adopts emulsion adhesive as matrix and micro-size and nano-size inorganic powder as modifier to prepare the compound and modified aqueous binder. The method of the invention can not only enhance the interface binding force of the aqueous binder, but also greatly improve the properties of water resistance, toughness and extensibility, leading comprehensive performance of the aqueous binder to be improved.

The present invention provides a biocompatible polymer composition for use in biomedical applications comprising a base molecule, a linker molecule and at least one initiator compound, said base molecule having at least two differing functionalities, and said linker molecule having a functionality reactive with at least one functionality of said base molecule, the first of said at least two functionalities of said base molecule enabling a first curing stage of said polymer composition by reaction with said linker molecule, and the second and any further functionality of said base molecule enabling second and further curing stages of said polymer composition, said first, second and any further curing stages being capable of activation simultaneously or independently of each other as required. The invention further provides uses of the polymer compositions of the invention in biomedical applications such as tissue engineering, dry delivery, as a bioadhesive in wound healing, as bone substitutes or scaffolds, as cements in dental and periodontal applications and as anti-adhesives or protective barriers.

The invention relates to adhesive for collecting formaldehyde and paint for collecting the formaldehyde, both of which use formaldehyde collecting agent as a composition of active components. The adhesive is used for adhesion of the outmost layer in a man-made board or adhesion and edge sealing at a kerf of the man-made board, can effectively absorb formaldehyde released by the man-made board, does not cause influence on the adhesive strength of the board, and is comparatively cheap. The paint is used for painting indoor walls, absorbs the formaldehyde in the indoor air, can also be used for painting the surface of the man-made board, seals and absorbs formaldehyde gas, and reduces the release amount of the formaldehyde. Compared with the prior art, the adhesive and the paint for collecting the formaldehyde have the advantages that the adhesive and the paint are cheap, can efficiently adsorb the formaldehyde and generate stable compounds, and do not re-decompose and release the formaldehyde, so the adhesive and the paint cannot generate other secondary pollutants.

The invention relates to compositions containing at least one epoxy resin A with on average more than one epoxy group per molecule; at least one epoxy adduct B with on average one epoxy group per molecule; at least one thixotropic agent C, based on a urea derivative in a non-diffusing support material; and at least one curing agent D for epoxy resins, which is activated by an increased temperature. According to preferred embodiments, the invention also relates to compositions containing at least one core-shell polymer E and/or filler F and/or reactive diluent G. The invention also relates to the use of said compositions as a single-component adhesive and to a method for producing the compositions. The invention further relates to the use of the thixotropic agent C, based on a urea derivative in a non-diffusing support material as an agent for increasing the impact resistance.

A moisture-curable adhesive composition that may be formulated to be free of volatile organic compounds, or substantially free of volatile organic compounds which is safe for chronic exposure, resistant to combustion, and provides a high peel strength useful for securing a rubber membrane material to a rigid roof deck includes a polymer having silicon-containing hydrolyzable terminal groups, a phenolic resin, and a non-polymeric silicon-containing hydrolyzable compound, wherein the ratio of the amount of polymer having silicon-containing hydrolyzable terminal groups by weight to the amount of phenolic resin by weight is greater than 2:1.

Thiolene-curing adhesive formulations, methods of preparation, and uses thereof are provided.

The invention discloses a method for preparing a non-toxic polyurethane curing agent with high solid content, which comprises the following steps of: 1, dehydrating a hydroxyl organic substance under the condition of a dehydration solvent and nitrogen protection, then dripping the hydroxyl organic substance into 10 to 100 percent of excessive diisocyanate monomer, and then reacting for 2 to 6 hours at the low temperature of between 30 and 90 DEG C to obtain a polyurethane prepolymer; 2, performing secondary separation on the polyurethane prepolymer obtained by the step one by adopting a film evaporator; and 3, pumping separated evaporation residues into a dilution container added with a solvent in advance by a pump, and stirring and diluting the obtained solution to obtain the curing agent. The method has the advantages of synthesizing the polyurethane prepolymer with uniform molecular weight distribution, low viscosity, good fluidity and suitability for separation, and not needing to add a separation assistant. The solid content of the polyurethane curing agent is between 60 and 85 percent, a NCO value is between 7.9 and 13.5 percent, and the content of free diisocyanate is between 0.15 and 0.5 percent.

A first electro-optic display comprises first and second substrates, and an adhesive layer and a layer of electro-optic material disposed between the first and second substrates, the adhesive layer comprising a mixture of a polymeric adhesive material and a hydroxyl containing polymer having a number average molecular weight not greater than about 5000. A second electro-optic display is similar to the first but has an adhesive layer comprising a thermally-activated cross-linking agent to reduce void growth when the display is subjected to temperature changes.

The invention relates to a two-component compound in which the first component A comprises at least one type of polyurethane prepolymer A1 which contains isocyanate end-groups and is produced from at least one type of polyisocyanate and the second component B which comprises water and at least one type of polyaldimine B1 and is obtainable from at least one type of polyamine PA containing aliphatic primary aminogropus and at least one type of aldehyde ALD of formula (I) or formula (II). The inventive compound is outstanding by the fact of the long processing time and high early strength thereof, a fast setting time, nevertheless without bubble formation, in particular said compound is odourless or exhibits a very low odour before, during and after thermosetting.

Polyurethane-based pressure sensitive adhesives comprising the reaction product of: an isocyanate-reactive component comprising at least two isocyanate-reactive materials, an isocyanate-functional component; a reactive emulsifying compound; a chain capping agent and an optional chain extending agent. The adhesives, which are preferably pressure sensitive adhesives, can be prepared from 100% solids, waterborne or solventborne systems.

A high-quality solar battery module having an excellent adhesive property, weathering resistance, and reliability of battery function and a method of assembling the same are disclosed. The solar battery module is constituted of a solar cell panel provided with solar cell elements arranged on the back said of a transmitting panel opposite to the light-receiving surface of the light-transmitting panel; and a frame provided with plate or flange projecting therefrom and arranged over the entire periphery of the panel in order to support the back side of the light-transmitting panel and keeps the light-receiving surface in open. The solar cell panel is bonded to the projecting plate of the frame with a moisture curing hot-melt adhesive composed mainly of a polymer containing at least two hydrolytic silyl group in one molecule.

This invention discloses a method for preparing modified aqueous polyurethane adhesive. The method comprises: (1) modifying epoxy resin with modifier to obtain modified epoxy resin; (2) reacting polyisocyanate with polyester or polyol polyether, and adding chain extender to obtain polyurethane with prepolymer; (3) modifying polyurethane prepolymer with modified epoxy resin to obtain modified polyurethane prepolymer; (4) adding water, dispersing by a high-speed disperser, and adding neutralizer and crosslinking agent to obtain modified aqueous polyurethane adhesive. This invention introduces epoxy resin into the modification of aqueous polyurethane adhesive, thus combines high modulus, high strength and good chemical resistance of epoxy resin with the advantages of polyurethane resin. The modified aqueous polyurethane adhesive can meet the needs of automobile inner decoration materials. The method has such advantages as simple process, and low cost.

The present invention relates to reactive compositions containing A) one or more blocked polyurethane prepolymers which have a content of blocked isocyanate groups (calculated as NCO) of 0.1 to 20 wt. % and are prepared from i) at least one aromatic, aliphatic, araliphatic and/or cycloaliphatic diisocyanate having a content of free NCO groups of 5 to 60 wt. %, ii) a polyol component containing at least one polyester polyol, and/or at least one polyether polyol and/or at least one polycarbonate polyol,

iii) CH-acidic cyclic ketones corresponding to formula (I) as blocking agents

wherein X represents an electron-attracting group,

• R¹ and R² independently of one another represent the radicals H,
• C₁-C₂₀ (cyclo)alkyl, C₆-C₂₄ aryl, C₁-C₂₀ (cyclo)alkyl ester or amide, C₆-C₂₄ aryl ester or amide, mixed aliphatic/aromatic radicals with 1 to 24 carbon atoms that can also be part of a 4- to 8-membered ring, n is an integer from 0 to 5, and B) one or more OH-functional compounds in which the OH component undergoes activation by a deposition amine component. The present invention also relates to a composite system containing two adherends bonded together with the reactive composition according to the invention.

The invention relates to a hydrolysis-resistant double-component polyurethane adhesive for structure adhesion. The hydrolysis-resistant double-component polyurethane adhesive for structure adhesion consists of a component A and a component B, wherein the component A comprises the following components in part by weight: 30 to 70 parts of polyisocyanate resin, 5 to 20 parts of plasticizing agent, 0.25 to 5 parts of thixotropic agent, 10 to 50 parts of incremental filler and 0.25 to 1 part of water-removing agent; and the component B comprises the following components in part by weight: 5 to 30 parts of polyester polyol, 5 to 30 parts of vegetable oil polyol, 5 to 30 parts of polyether polyol, 3 to 15 parts of water-absorbing filler, 1 to 10 parts of thixotropic agent, 3 to 15 parts of incremental filler, 0.1 to 10 parts of pigment, 0.1 to 5 parts of adhesion force accelerator, 0.1 to 2 parts of chain extender and 0.01 to 0.2 part of catalyst. An adhesion system improves adhesion property, solves the problem that a thermosetting composite material is subjected to surface roughening treatment before adhesion and improves the using efficiency. Aiming at the problem of poor hydrolysis resistance of a polyester type polyurethane adhesive system, the hydrolysis resistance is improved through molecule design of polyurethane soft and hard sections.

The invention discloses solvent free bi-component polyurethane adhesive and a preparation method thereof, wherein the solvent free bi-component polyurethane adhesive relates to a compound soft package adhesive in the fields of food, medicine, and the like. The adhesive comprises a component A and a component B, wherein the component A is an isocyanate compound, the component B is polyol, and the adhesive is obtained in such a way that the component A and the component B are mixed according to the weight percent of 2:1. The adhesive solves the problem that the use effect is influenced and the use range is limited because of poor properties of transparency, viscosity, low-temperature coating and stripping strength, and boiling resistance existing in the prior solvent free adhesive. The adhesive is environmental-friendly without solvent because the component A and the component B of the adhesive both are transparent liquid, has low viscosity as well as better low-temperature coating and stripping strength, and keeps better stripping strength after being boiled, thereby being environmental-friendly adhesive, wherein the viscosity of the component A is 2000-5000MPa.s and the viscosity of the component b is 400-2000MPa.s below 25 DEG C.

The invention discloses a heat-resistant UV visbreaking glue composition and a UV visbreaking protective film prepared with this composition. This composition is made from the following materials according to parts by weight: 1-25% of a polyfunctional oligomer or polyfunctional monomer or its composition, 30-50% of a solvent type high-temperature-resistant polyacrylate pressure-sensitive glue, 0.5-1.5% of a cross-linking agent, 0.3-1.5% of a photo-initiator, and 35-60% of a solvent. The heat-resistant UV visbreaking protective film comprises a base (10), a bottom coating layer (20) applied to the surface of the base (10), a UV visbreaking glue layer (30) applied to the bottom coating layer (20), and a release film (40). The heat-resistant UV visbreaking protective film prepared herein can resist a high temperature of 120 DEG C and has the advantages of high UV pre-illumination release force, low UV post-illumination release force and no glue residue.

An object of the invention is to provide a pressure-sensitive adhesive sheet. Provided is an acrylic polymer for use in a pressure-sensitive adhesive composition for a touch screen panel, the acrylic polymer being obtained by copolymerizing monomer components comprising (a) a (meth)acrylic acid ester monomer having a C_1-12 hydrocarbon group, (b) a hydroxy group-containing (meth)acrylic acid ester monomer, (c) an amide group-containing monomer, and (d) a vinyl ester monomer. The acrylic polymer has an acid value of 0.1 mg KOH/g or less, a weight-average molecular weight of 400,000 to 2,000,000, a Tg of −80 to 0° C., and a permittivity of 3 to 6.

Priming compositions and methods, wherein the compositions include a polydiorganosiloxane polyurea copolymer comprising electron rich groups.

A method is provided for adhering a polyurethane-based sealant or adhesive to a substrate. The method comprises: i) applying an aqueous primer solution onto a substrate, the primer solution comprising water, an aminotitanate compound, and preferably an epoxysilane compound having at least one epoxy group and at least two alkoxy groups; ii) applying a polyurethane adhesive or sealant to the primer-treated substrate; and iii) forming a reaction product of the primer and the polyurethane. Also provided are a substrate having a layer of a polyurethane adhesive or sealant, and a stabilized aqueous primer solution containing an epoxysilane compound and an aminotitanate compound.