Crosslinked polyester elastomers, compositions, and methods for preparing the same.

Abstract

This disclosure provides polyester elastomers, compositions, and methods for preparing such elastomers and compositions. The polyester elastomers in this disclosure are prepared by reacting at least one activated polycarboxylic acid with at least one polyol. Crosslinked polyester elastomer compositions can be formulated into a variety of personal care formulations.

Description

[Technical Field]

[0001] This disclosure provides polyester elastomers, compositions, and methods for preparing such elastomers and compositions. These elastomers are prepared by reacting at least one activated polycarboxylic acid with at least one polyol. Furthermore, these elastomers can be converted into elastomer powders and gels. Such elastomers and elastomer gels can be biodegradable and can be produced from biorenewable raw materials. Moreover, such elastomer gels offer advantageous properties when combined with various personal care products. [Background technology]

[0002] Crosslinked polymers are added to modify the sensory, textural, rheological, and optical behavior of various cosmetic products. Silicone elastomers are particularly important because they can form dimethicone, a three-dimensional elastic particle polymer, which provides advantageous sensory, textural, and optical effects for cosmetic products. However, conventional silicone elastomers have limited versatility in terms of compatibility with polar solvents such as hydrocarbon oils, vegetable oils, glycerin, and water. Therefore, although the performance of silicone elastomers is unparalleled, there is a demand for alternatives to silicone elastomers. In particular, there is a market demand for non-silicone elastomer materials.

[0003] Many polyesters and polyurethanes are publicly known and listed in the EU's public cosmetic ingredient database. Some of these components are synthetically produced prepolymers, crosslinked with bifunctional or trifunctional amine-based chain extenders. However, amine-based components are undesirable for the development of cosmetic raw materials due to their strong odor and yellowing issues. Micronized polyurethane particles based on synthetic raw materials are commercially available. While these materials exhibit excellent tactile and soft-focus (optical) properties, they do not possess the same elastic properties as silicone elastomers. U.S. Patent Application 20210059924A1 discloses alternative bio-based polyurethane elastomers developed based on crosslinking of aliphatic linear copolymers, fatty acid dimers and diols with bio-based aliphatic polyisocyanates. However, the use of isocyanates is often undesirable for the development of cosmetic raw materials due to the potential risk of isocyanate exposure in the manufacturing setting (Environ. Health Perspect. 2007, 115(3):328-335). U.S. Patent Application No. 20220195178A1 discloses a polyester elastomer composition prepared by a direct esterification reaction between a fatty acid and aliphatic alcohols with multiple functionalities. However, crosslinking highly branched fatty acids using conventional esterification methods is extremely time-consuming, reversible, and incomplete. Polyester elastomers prepared by this method often contain unreacted fatty acids as well as aliphatic alcohol monomers and oligomers, which adversely affect the elastic properties of the elastomer. Therefore, there remains a need to develop high-performance natural elastomer compositions that match the sensory profile of silicone gels.

[0004] The cross-linked polyester elastomers known today are produced by conventional Fischer-Speier ester synthesis, in which a carboxylic acid is directly condensed with an alcohol under the catalytic action of a strong Brønsted acid. This reaction is reversible and requires the continuous removal of water by a high-temperature distillation process. While strong Brønsted acids are very effective esterification catalysts, they also lead to undesirable side reactions such as the dehydrative etherification of the alcohol (ChemCatChem 2020, 12, 5229-5235). Although direct, catalyst-free conversion of carboxylic acids and alcohols to esters is possible, it requires temperatures up to 250°C to achieve complete conversion under equilibrium conditions (J. Otera and J. Nishikido, Esterification: Methods, Reactions, and Applications, Wiley-VCH Verlag GmbH & Co., Weinheim, 2010). Consequently, cross-linked polyester elastomers produced today contain a considerable amount of undesirable by-products, which often have adverse effects on the properties of the elastomer. The present invention provides a method for preparing a crosslinked polyester composition comprising a reaction product of an activated polyfatty acid, wherein the activated polyfatty acid is generated in situ or out of situ using a suitable activator, a polyol, and a suitable solvent in the presence of a catalyst. The activated acid group described herein undergoes an esterification reaction with the polyol, forming carbon dioxide rather than water as a by-product. The spontaneous removal of carbon dioxide gas from the reaction mixture moves the esterification reaction toward completion, resulting in a high-purity elastomer with no or negligible unreacted initiation monomers. These elastomers exhibit improved rheological behavior compared to conventionally disclosed elastomers of the same kind.

[0005] In one embodiment, the present invention provides a personal care composition containing a polyester elastomer.

[0006] Polyesters are a type of compound that contains ester functional groups in their polymer chains. Ester groups are hydrolyzable when treated with certain biological catalysts or mixed culture media of certain microorganisms; therefore, many polyesters are biodegradable. In recent years, there has been a significant increase in interest in designing and developing bio-based polyesters from biorenewable resources for use as emollients, emulsifiers, film-forming agents, or other functional ingredients for personal care formulations. See, for example, U.S. Patents 8,414,906; 9,334,358; 6,540,987; and 7,820,758. However, no polyester elastomer or gel has yet been reported to offer consumers numerous advantages as an alternative to silicone gels. [Overview of the project]

[0007] This invention discloses a high-purity crosslinked polyester elastomer containing a reaction product of an activated polyfatty acid, where the activated polyfatty acid is generated in situ or out of situ using a suitable activator, polyol, and suitable solvent in the presence of a catalyst. The activated acid group disclosed herein undergoes a crosslinking reaction with the polyol, forming carbon dioxide (gas) rather than water as a by-product. The spontaneous removal of carbon dioxide from the reaction mixture moves the esterification reaction toward completion, resulting in a high-purity elastomer with no or negligible unreacted initiation monomers. These elastomers are expected to offer superior performance advantages, such as improved sensory, structural, and rheological behavior, compared to similar elastomers disclosed to date. In embodiments, this invention relates to a personal care composition containing such a high-purity polyester elastomer.

[0008] In embodiments, this disclosure includes:

[0009] (i) at least one activated polycarboxylic acid; and

[0010] (ii) Provide an elastomer comprising a reaction product with at least one polyol;

[0011] wherein (a) at least one polycarboxylic acid and at least one polyol have a total of at least five carboxyl and hydroxyl functional groups; and (b) at least one activated polycarboxylic acid or at least one polyol has at least three carboxyl or hydroxyl functional groups.

[0012] In an embodiment, the present disclosure provides an elastomer prepared by reacting:

[0013] (i) At least one polycarboxylic acid of formula (III)

Chemical formula

[0014] wherein

[0015] R 3 is a C2 - C 200 alkyl group, C2 - C 200 heteroalkyl group, C2 - C 200 alkene group, C2 - C 200 heteroalkene group, C2 - C 200 alkyne group, C2 - C 200 heteroalkyne group, C3 - C 200 cyclic group, or C2 - C 200 heterocyclic group; and

[0016] o is an integer from 2 to 10;

[0017] (ii) At least one activator of formula (IV)

Chemical formula

[0018] wherein

[0019] R 4is C1~C 60 Represents a linear or branched alkyl radical having atoms; and

[0020] (iii) At least one polyol of formula (II) [ka]

[0021] During the ceremony

[0022] R 2 is C2~C 200 Alkyl alkyl groups, C2-C 200 Heteroalkyl groups, C2-C 200 Alkene group, C2~C 200 Heteroalkene group, C2~C 200 Alkyne group, C2~C 200 Heteralkyne group, C3~C 200 Cyclic group, or C2~C 200 Heterocyclic group; and

[0023] n is an integer between 2 and 10.

[0024] In one embodiment, the present invention provides a method for preparing an elastomer composition, which is:

[0025] (i) at least one activated polycarboxylic acid; and

[0026] (ii) comprising reacting at least one polyol in the presence of at least one solvent to form a crosslinked polymer structure;

[0027] In the formula, (a) at least one activated polycarboxylic acid and at least one polyol have a total of at least five carboxyl and hydroxyl functional groups; and (b) at least one polycarboxylic acid or at least one polyol has at least three carboxyl or hydroxyl functional groups.

[0028] In one embodiment, the present invention provides a method for preparing an elastomer composition, which is:

[0029] (i) at least one activated polycarboxylic acid; and

[0030] (ii) at least one polyol; reacted in the presence of at least one solvent to form a crosslinked polymer structure;

[0031] (iii) forming a swollen crosslinked polymer structure by combining the crosslinked polymer structure with a second solvent; and

[0032] (iv) Applying shear force to the swollen crosslinked polymer structure forms a uniform polyester elastomer gel;

[0033] In the formula, (a) at least one activated polycarboxylic acid and at least one polyol have a total of at least five carboxyl and hydroxyl functional groups; and (b) at least one polycarboxylic acid or at least one polyol has at least three carboxyl or hydroxyl functional groups.

[0034] In embodiments, the present disclosure provides the use of gels prepared from the elastomers described herein as personal care formulations. [Modes for carrying out the invention]

[0035] I. Definition Unless otherwise specified, any atom whose valency is not met is assumed to have enough hydrogen atoms to satisfy that valency.

[0036] It should be noted that the terms “a certain” or “one” existence refer to one or more such existences; for example, “a certain nucleic acid sequence” is understood to refer to one or more nucleic acid sequences unless otherwise specified. Thus, the terms “a certain” (or “one”), “one or more,” and “at least one” can be used interchangeably in this application.

[0037] Furthermore, when used in this application, “and / or” is understood to be a specific disclosure of each of the two identified features or components, with or without the other. Thus, when the term “and / or” is used in this application in a phrase such as “A and / or B,” it is intended to include “A and B,” “A or B,” “A” (alone), and “B” (alone). Similarly, when the term “and / or” is used in this application in a phrase such as “A, B and / or C,” it is intended to include each of the following aspects: A, B, and C; A, B, or C; A or C; A or B; B or C; A and C; A and B; B and C; A (alone); B (alone); and C (alone).

[0038] When a feature is described in this application using the term "includes," it is understood that the same feature is also presented, except that it is described using the terms "consist of" and / or "essentially consists of."

[0039] In this application, the term "approximately" means roughly, roughly, about, or around the same time. When the term "approximately" is used in relation to a numerical range, it modifies that range by extending the upper and lower boundaries of the stated numerical value. Generally, the term "approximately" can modify a numerical value by changing the upper and lower values ​​of the stated value by, for example, 10 percent up or down (higher or lower).

[0040] Where used in this application, unless otherwise specified, the following definitions apply. For the purposes of this disclosure, chemical elements are identified in accordance with the CAS Periodic Table of Elements and the Handbook of Chemistry and Physics, 75th edition, 1994. In addition, the general principles of organic chemistry are described in Thomas Sorrell, *Organic Chemistry*, University Science Books, Sausalito: 1999, and in MBSmith and J. March, eds., *March's Advanced Organic Chemistry*, 6th edition, John Wiley & Sons, New York: 2007, and their entire contents are incorporated into this application by reference.

[0041] As used in this application, the term "hydrocarbon" refers to a linear or branched aliphatic hydrocarbon containing 1 to 200 carbon atoms, either by itself or as part of a group, i.e., C1-C12. 200 Hydrocarbons refer to linear or branched aliphatic hydrocarbons containing a specified number of carbon atoms, such as C1 alkyls like methyl and C2 alkyls like ethyl. In one embodiment, the hydrocarbon is C2-C 200 It is a hydrocarbon group. In the embodiment, the hydrocarbon is C6~C 60 It is a hydrocarbon group. In the embodiment, the hydrocarbon is C6~C 60 It is a hydrocarbon group. In the embodiment, the hydrocarbon is C2-C 60 It is a hydrocarbon group. In another embodiment, the hydrocarbon is C5~C 22 These are hydrocarbon groups. Examples of hydrocarbon groups include butyl, octyl, decyl, lauryl, cetyl (palmityl), and stearyl.

[0042] As used in this application, the term "alkyl" refers to a linear or branched aliphatic hydrocarbon containing 1 to 200 carbon atoms, either by itself or as part of a group, i.e., C2-C2 200Alkyl refers to a linear or branched aliphatic hydrocarbon containing a specified number of carbon atoms, such as a C1 alkyl like methyl or a C2 alkyl like ethyl. In one embodiment, alkyl is C2-C 200 It is an alkyl group. In another embodiment, the alkyl group is C6-C 60 It is an alkyl group. In another embodiment, the alkyl group is C2-C 60 It is an alkyl group. In another embodiment, the alkyl group is C5-C 22 These are alkyl groups. Examples of alkyl groups include butyl, octyl, decyl, lauryl, cetyl (palmityl), and stearyl.

[0043] As used in this application, the term "alkene" refers to an alkyl group containing one, two, three, or more carbon-carbon double bonds, either by itself or as part of a group. In one embodiment, the alkene group is C2-C 200 In another embodiment, the alkene group is C6-C 60 In another embodiment, the alkene group is C2-C 60 In another embodiment, the alkene group is C5-C 22 It is an alkene group.

[0044] As used in this application, the term "alkyne" refers to an alkyl group containing one, two, three, or more carbon-carbon triple bonds, either by itself or as part of a group. In another embodiment, the alkyne is C2-C 200 It is an alkyne group.

[0045] As used in this application, the term "cyclic" refers to a stable cyclic compound containing three or more atoms, either by itself or as part of a group. In some embodiments, the cyclic compound is C3-C3 200 It is a cyclic group. In one embodiment, the cyclic group is C6~C 60 It is a cyclic group. In one embodiment, the cyclic group is C5~C 22 It is a cyclic group. Examples of cyclic compounds include benzene, cyclopentane, and cyclohexane.

[0046] The term “heteroalkyl” as used in this application refers to a stable linear or branched alkyl radical containing, by itself or as part of a group, 2 to 200 carbon atoms and at least one heteroatom selected from O, N, or S, which may be identical or different, and the sulfur atom may be optionally oxidized. The heteroatom can be located at any internal position of the heteroalkyl group or at a position where the heteroalkyl group is bonded to the remainder of the molecule. In some embodiments, the heteroalkyl group is C2-C 60 It is a heteroalkyl group. In this embodiment, the heteroalkyl group is C2-C 60 These are heteroalkyl groups. Examples of heteroalkyl compounds include succinyl, adipoyl, and sebacoyl.

[0047] The term "heteroalkene," as used in this application, refers to a stable linear or branched alkene radical containing, either by itself or as part of a group, 2 to 200 carbon atoms and at least one heteroatom selected from O, N, or S, which may be identical or different, and the sulfur atom may be optionally oxidized. The heteroatom can be located at any internal position of the heteroalkyl group or at a position where the heteroalkyl group is bonded to the remainder of the molecule. In embodiments, the heteroalkene is C6~C 60 It is a heteroalkene group. In this embodiment, the heteroalkene is C2~C 60 These are heteroalkene groups. Examples of heteroalkene compounds include oleoyl, ricinolyl, and linoleoyl.

[0048] As used in this application, the term "heteralkyne" refers to a stable linear or branched alkyne radical containing, by itself or as part of a group, 2 to 200 carbon atoms and at least one heteroatom selected from O, N, or S, which may be identical or different, and the sulfur atom may be optionally oxidized. The heteroatom can be located at any internal position of the heteroalkyl group or at a position where the heteroalkyl group is bonded to the remainder of the molecule.

[0049] As used in this application, the term "heterocyclic" refers to a stable cyclic compound that contains, by itself or as part of a group, two or more carbon atoms and at least one heteroatom selected from O, N, or S, which may be identical or different. In embodiments, the heterocyclic group is C2-C 200 It is a heterocyclic group. In this embodiment, the heterocyclic group is C6~C 60 It is a heterocyclic group. In this embodiment, the heterocyclic group is C5~C 22 These are heterocyclic groups. Examples of heterocyclic groups include furan, oxolane, and thiophene.

[0050] As used in this application, the term "activated polycarboxylic acid" refers to a repeating unit of mixed anhydride that is repeated 2 to 10 integer times, either by itself or as part of a group. The ends of the mixed anhydride are C1-C 60 It is a hydrocarbon with a carbon atom length of . The non-repeating end of the mixed anhydride is C2~C 200 Alkyl alkyl groups, C2-C 200 Heteroalkyl groups, C2-C 200 Alkene group, C2~C 200 Heteroalkene group, C2~C 200 Alkyne group, C2~C 200 Heteralkyne group, C3~C 200 Cyclic group, or C2~C 200 The group is selected from the group consisting of heterocyclic groups. Activated polycarboxylic acids can be produced through the reaction of a polycarboxylic acid with an activator.

[0051] As used in this application, the term “olefin” refers to any species having at least one ethylenically charged double bond, such as linear or branched aliphatic olefins, alicyclic olefins, aryl-substituted olefins, and others. Olefins may be optionally substituted at terminal double bonds (one or more) ("terminal olefins") and / or internal double bonds (one or more) ("internal olefins"), cyclic or acyclic, linear or branched. The total number of carbon atoms may be from 1 to 100, or from 1 to 40; the double bonds may be unsubstituted, or mono-, di-, tri-, or tetra-substituted.

[0052] As used in this application, the term "polyolefin" refers to homopolymers or copolymers of ethylene, propylene, butene, and other unsaturated aliphatic hydrocarbons, vinyl esters (e.g., vinyl acetate), or (meth)acrylic compounds (e.g., butyl acrylate, acrylic acid). Generally, polyolefins are polymers of ethylene, propylene, or copolymers thereof, or ethylene or propylene with one or more C4-C4 compounds. 12 It is a copolymer with an α-olefin aliphatic comonomer.

[0053] Various embodiments of this disclosure are described in detail below. II. Composition

[0054] In one embodiment, this disclosure is:

[0055] at least one activated polycarboxylic acid; and

[0056] The aim is to produce a crosslinked polyester elastomer containing a reaction product with at least one polyol;

[0057] In the formula, (a) at least one activated polycarboxylic acid and at least one polyol have a total of at least five carboxyl and hydroxyl functional groups, and (b) at least one polycarboxylic acid or at least one polyol has at least three carboxyl or hydroxyl functional groups. A. Ingredients 1. Activated polycarboxylic acid

[0058] In this embodiment, at least one activated polycarboxylic acid is a compound of formula (I) [ka]

[0059] During the ceremony

[0060] R 1 is C2~C 200 Alkyl alkyl groups, C2-C 200 Heteroalkyl groups, C2-C 200 Alkene group, C2~C 200 Heteroalkene group, C2~C 200 Alkyne group, C2~C 200 Heteralkyne group, C3~C 200 Cyclic group, or C2~C 200 heterocyclic group;

[0061] R A is monovalent C1~C 60 hydrocarbon group; and

[0062] m is an integer between 2 and 10.

[0063] In this embodiment, the compound is of formula (I), where R 1 is C6~C 60 Alkyl alkyl groups, C6-C 60 Heteroalkyl groups, C6-C 60 Alkene group, C6~C 60 Heteroalkene group, C6~C 60 Cyclic group, or C6~C 60A heterocyclic group; and m is an integer from 2 to 10.

[0064] In an embodiment, the compound is of formula (I), wherein m is an integer from 2 to 6. In an embodiment, the compound is of formula (I), wherein m is 2, 3, 4, 5, or 6.

[0065] In an embodiment, at least one activated polycarboxylic acid is a polycarboxylic acid of formula (III)

Chemical formula

[0066] wherein ]><^{0000626}> R 3 is a C2-C 200 alkyl group, C2-C 200 heteroalkyl group, C2-C 200 alkene group, C2-C<000007].heteroalkene group, C2-C 200 alkyne group, C2-C 200 heteroalkyne group, C3-C 200 cyclic group, or C2-C 200 heterocyclic group; and

[0068] o is an integer from 2 to 10;

[0069] is a compound generated in-situ or off-site by reacting with an activator.

[0070] In a further embodiment, the compound is of formula (III), wherein R 3 is a C6-C 60 alkyl group, C6-C 60 heteroalkyl group, C6-C 60 alkene group, C6-C 60 heteroalkene group, C6-C 60 cyclic group, or C6-C 60 heterocyclic group; and o is an integer from 2 to 10.

[0071] In one embodiment, the compound is of formula (III), where o is an integer from 2 to 6. In another embodiment, the compound is of formula (III), where o is 2, 3, 4, 5, or 6.

[0072] In this embodiment, the polycarboxylic acid of formula (III) is succinic acid, adipic acid, azelaic acid, sebacic acid, dodecanediic acid, hexadecanedioic acid, C 21 Dimer acid, C 36 Dimer acid, hydrogenated C 36 The polycarboxylic acid is selected from the group consisting of dimer acid, aspartic acid, glutamic acid, tartaric acid, maleic acid, and combinations thereof. In this embodiment, the polycarboxylic acid is a dimer acid.

[0073] In this embodiment, at least one activated polycarboxylic acid is a mixture of activated polycarboxylic acids produced in-situ or out-of-situ by reacting dimer acid and oleic acid with an activator.

[0074] In one embodiment, at least one activated polycarboxylic acid is generated in-situ or out-of-situ by reacting the polycarboxylic acid with an activator of formula (IV). [ka]

[0075] R in the formula 4 is C1~C 60 This represents a linear or branched alkyl radical containing atoms.

[0076] In this embodiment, the activator is selected from the group consisting of dimethyl dicarbonate, diethyl dicarbonate, dipropyl dicarbonate, di-tert-butyl dicarbonate, and combinations thereof. In this embodiment, the activator is di-tert-butyl dicarbonate.

[0077] In this embodiment, the compound is of formula (IV), where R 4 is C6~C60 an alkyl group, C6-C 60 a heteroalkyl group, C6-C 60 an alkene group, C6-C 60 a heteroalkene group, C6-C 60 a cyclic group, or C6-C 60 a heterocyclic group. 2. Polyol

[0078] [[ID=*17]]In an embodiment, at least one polyol is a compound of formula (II)

Chemical formula

[0079] wherein

[0080] R 2 is a C2-C 200 alkyl group, C2-C 200 heteroalkyl group, C2-C 200 alkene group, C2-C 200 heteroalkene group, C2-C 200 alkyne group, C2-C 200 heteroalkyne group, C3-C 200 cyclic group, or C2-C 200 heterocyclic group; and

[0081] n is an integer from 2 to 10.

[0082] In an embodiment, the compound is of formula (II), wherein R 2 is a C2-C 200 alkyl group, C2-C 200 heteroalkyl group, C2-C 200 alkene group, or C2-C 200 heteroalkene group; and n is an integer from [2] to 10. In a further embodiment, the compound is of formula (II), wherein R 2 is a C2-C 60 alkyl group, C2-C 60 heteroalkyl group, C2-C 60 alkene group, or C2-C 60 Note: There seems to be an incomplete or incorrect part in the original text where "from [2]" is written in ID=67. It should probably be "from 2" like in other similar expressions. This translation is done based on the provided text as accurately as possible.A heteroalkene group; and n is an integer from 2 to 10.

[0083] In one embodiment, the compound is of formula (II), where n is an integer from 2 to 6. In another embodiment, the compound is of formula (II), where n is 2, 3, 4, 5, or 6.

[0084] In this embodiment, the polyol is glycerin, diglycerin, polyglycerin, sorbitol, castor oil, hydrogenated castor oil, sugar alcohol, monosaccharides, disaccharides, oligosaccharides, polysaccharides, tannins, gallic acid, gluconic acid, lactobionic acid, gluconolactone, ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,2-pentanediol, 1,3-pentanediol, 1,4-pentanediol, 1,5-pentanediol, 1,2-hexanediol, 1,5-hexanediol, 1,6-hexanediol, C 36 Dimer ol, hydrogenated C 36 The polyol is selected from the group consisting of dimer ols and combinations thereof. In this embodiment, the polyol is hydrogenated castor oil. In this embodiment, the polyol is diglycerin. B. Additional ingredients

[0085] In this embodiment, the elastomer composition is prepared by reacting the following: (i) at least one polycarboxylic acid of formula (III) [ka]

[0086] During the ceremony

[0087] R 3 is C2~C 200 Alkyl alkyl groups, C2-C 200 Heteroalkyl groups, C2-C 200 Alkene group, C2~C 200 Heteroalkene group, C2~C 200 Alkyne group, C2~C 200Heteralkyne group, C3~C 200 Cyclic group, or C2~C 200 Heterocyclic group; and

[0088] o is an integer between 2 and 10;

[0089] (ii) At least one activator of formula (IV) [ka]

[0090] During the ceremony

[0091] R 4 is C1~C 60 Represents a linear or branched alkyl radical having atoms; and

[0092] (iii) At least one polyol of formula (II) [ka]

[0093] During the ceremony

[0094] R 2 is C2~C 200 Alkyl alkyl groups, C2-C 200 Heteroalkyl groups, C2-C 200 Alkene group, C2~C 200 Heteroalkene group, C2~C 200 Alkyne group, C2~C 200 Heteralkyne group, C3~C 200 Cyclic group, or C2~C 200 Heterocyclic group; and

[0095] n is an integer between 2 and 10. 1. Ratio

[0096] In this embodiment, the molar ratio of the total carboxyl functional groups (-COOH) to the activator is approximately 1.5:1 to approximately 1:10. In this embodiment, the molar ratio of the total carboxyl functional groups to the activator is approximately 1.5:1 to approximately 1:8. In this embodiment, the molar ratio of the total carboxyl functional groups (-COOH) to the activator is approximately 1:5:1 to approximately 1:5. In this embodiment, the molar ratio of the total carboxyl functional groups (-COOH) to the activator is approximately 1.5:10, approximately 1.5:9, approximately 1.5:8, approximately 1.5:7, approximately 1.5:6, approximately 1.5:5, approximately 1.5:4, approximately 1.5:3, approximately 1.5:2, or approximately 1.5:1.

[0097] In this embodiment, the molar ratio of the total carboxyl functional groups (-COOH) to the total hydroxyl functional groups (-OH) is approximately 1.5:1 to approximately 1:1.5. In this embodiment, the molar ratio of the total carboxyl functional groups (-COOH) to the total hydroxyl functional groups (-OH) is approximately 1.25:1 to approximately 1:1.25. In this embodiment, the molar ratio of the total carboxyl functional groups (-COOH) to the total hydroxyl functional groups (-OH) is approximately 1.5:1, approximately 1.45:1.05, approximately 1.4:1.1, approximately 1.35:1.15, approximately 1.3:1.2, approximately 1.25:1.25, approximately 1.2:1.3, approximately 1.1:1.4, approximately 1.05:1.45, or approximately 1:1.5. 2. Elastomer composition

[0098] In this embodiment, the composition is prepared by combining elastomers with one or more solvents to form a gel or paste.

[0099] In one embodiment, the elastomer is crushed to form elastomer powder. In another embodiment, the crosslinked polyester elastomer is crushed to form crosslinked polyester elastomer powder.

[0100] In one embodiment, the composition is prepared by shearing an elastomer with a solvent as described in this application to form a sheared gel. In another embodiment, the composition is prepared by first combining an elastomer with a solvent as described in this application to form a mixture, and then shearing the mixture.

[0101] In the embodiment, the composition is a gel or a paste.

[0102] The gel composition according to the present invention is characterized by vibration amplitude and rheological tests at 25°C that depend on the vibration amplitude. Within a linear viscoelastic range in the frequency range of 0.01 to 100 Hz, the gel has a storage modulus G', which is always greater than the loss modulus G''. G' and G'' in this application are rheological parameters known to those skilled in the art. The modulus shown as G', i.e., the storage modulus, is an indicator of how elastic the material is, i.e., how much mechanical energy is stored per deformation cycle, while the viscosity or loss modulus, i.e., G'', is a measure of the mechanical energy lost or dissipated in the form of heat and / or other means per deformation cycle. Together, these quantify the elastic or viscous portion of viscoelastic solids and / or liquids, as described, for example, in Viscoelastic Properties of Polymers by Ferry, JD, John Wiley & Sons, New York: 1980. ISBN 0-471-04894-1

[0103] The polyester elastomer gel according to the present invention has an excellent yield point, which has a favorable effect, for example, on its thickening properties and also on its ability to stabilize dispersed components of personal care formulations. For dynamic vibration rheology testing, for example, a DHR hybrid rheometer (TA Instruments Inc.) with a 25 mm parallel steel plate configuration can be used.

[0104] Polyester elastomer gel, 10s -1 It is noteworthy that at shear rates and temperatures of 25°C, they have a viscosity of less than 100,000,000 cp while simultaneously satisfying G'>G''; Tanδ>1 within the linear viscoelastic range, and exhibiting properties that are largely independent of frequency. The polyester gels prepared by the method of this application are characterized by good fluidity, which has a favorable effect on handling and processability, yet still have an excellent yield point, thereby possessing good thickening and stabilizing properties.

[0105] In this embodiment, the elastic modulus (G') of the gel is measured by a rheometer within a linear viscoelastic range using dynamic rheology and is approximately 10 Pa to approximately 100,000 Pa. In this embodiment, the elastic modulus (G') of the gel is approximately 100 Pa to approximately 50,000 Pa. In this embodiment, the elastic modulus (G') of the gel is approximately 500 Pa to approximately 30,000 Pa. In this embodiment, the elastic modulus (G') of the gel is approximately 10 Pa, approximately 100 Pa, or approximately 500 Pa, or approximately 700 Pa, or approximately 800 Pa, or approximately 1,000 Pa, or approximately 1,500 Pa, or approximately 2,000 Pa, or approximately 2,500 Pa, or approximately 5,000 Pa, or approximately 10,000 Pa, or approximately 15,000 Pa, or approximately 25,000 Pa, or approximately 50,000 Pa, or approximately 100,000 Pa.

[0106] In one embodiment, the gel is composed of particles with dimensions ranging from approximately 1 μm to approximately 500 μm, as measured by an optical microscope. In another embodiment, the gel is composed of particles with dimensions ranging from approximately 25 μm to approximately 400 μm. In yet another embodiment, the gel is composed of particles with dimensions ranging from approximately 1 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 75 μm, 100 μm, 125 μm, 150 μm, 175 μm, 200 μm, 225 μm, 250 μm, 275 μm, 300 μm, 325 μm, 350 μm, 375 μm, 400 μm, or approximately 500 μm.

[0107] In this embodiment, the viscosity of the gel is measured by a rheometer at a shear rate of 10s. -1 The viscosity is measured to be approximately 10 cp to approximately 1,000,000 cp. These are approximately 100,000 cp, 150,000 cp, 200,000 cp, 250,000 cp, 300,000 cp, 350,000 cp, 400,000 cp, 450,000 cp, 500,000 cp, 550,000 cp, 600,000 cp, 650,000 cp, 700,000 cp, 750,000 cp, 800,000 cp, 850,000 cp, 900,000 cp, 950,000 cp, or 1,000,000 cp.

[0108] In one embodiment, the elastomer composition is prepared using the method described herein. III. Method A. Method for preparing elastomers 1. Esterification reaction

[0109] In embodiments, this disclosure includes:

[0110] (i) at least one activated polycarboxylic acid; and

[0111] (ii) The present invention relates to a method for preparing an elastomer, comprising reacting at least one polyol.

[0112] In embodiments, this disclosure is directed toward a method for preparing elastomers, which includes:

[0113] (a)

[0114] (i) at least one activated polycarboxylic acid; and

[0115] (ii) at least one polyol; reacted in the absence of a solvent in the first reaction step; and

[0116] (b) The reaction is continued in the presence of at least one solvent in the second reaction step.

[0117] In embodiments, this disclosure is directed toward a method for preparing elastomers, which includes:

[0118] (a)

[0119] (i) at least one activated polycarboxylic acid; and

[0120] (ii) at least one polyol; reacted in the absence of a solvent in the first reaction step; and

[0121] (b) In the second reaction step, the reaction is continued in the presence of at least one solvent;

[0122] Here, the first reaction step is at least 2 hours long.

[0123] In this embodiment, at least one activated polycarboxylic acid is a compound produced by reacting the polycarboxylic acid of formula (III) described herein with an activator in-situ or out-of-situ.

[0124] In this embodiment, at least one polyol is a compound of formula (II) as described in this application.

[0125] In this embodiment, at least one activator is a compound of formula (IV) described in this application.

[0126] In one embodiment, the preparation of the elastomer is carried out under nitrogen protection, vacuum, or a combination thereof.

[0127] In one embodiment, this method further includes adding water to suppress the activator during the reaction.

[0128] In this embodiment, this method further:

[0129] (iii) A swollen crosslinked polymer structure is formed by combining the crosslinked polyester structure with a second solvent;

[0130] (iv) The method includes forming a uniform polyester elastomer by applying a shear force to a swollen crosslinked polymer structure.

[0131] In the embodiment, the shear force is provided by any type of mixing and shearing device. In the embodiment, the mixing and shearing device is a batch mixer, a planetary mixer, a single-screw or multi-screw extruder, a dynamic or static mixer, a colloidal mill, a homogenizer, a sonorator, or a combination thereof. 2. Removal of by-products

[0132] In some embodiments, the method further includes removing water and alcohol by-products from the reactants. In further embodiments, water and alcohol by-products are removed from the reaction system by mixing and heating the reactants. In some embodiments, the reactants are heated to above about 120°C. In some embodiments, water and alcohol by-products are removed from the reactants by a nitrogen stream or vacuum. 3. Catalyst

[0133] In this embodiment, the reaction further includes a catalyst. Such catalysts include, but are not limited to, Yb(OTf)3, Sc(OTf)3, Hf(OTf)4, Bi(OTf)3, Al(OTf)3, Zn(OTf)2, Mg(ClO4)2, Cu(OTf)2, Ti(OCH(CH3)2)4, 1,8-diazabicyclo(5.4.0)undeca-7-ene (DBU), pyridine, and 4-dimethylaminopyridine (DMAP). 4. Solvent

[0134] In this embodiment, the reaction occurs in the presence of a solvent. In some embodiments, the solvent is bio-based or naturally occurring. In this embodiment, the solvent is a triglyceride solvent, a monoester solvent, a diester solvent, a citrate ester solvent, an ether solvent, a carbonic acid solvent, a hydrocarbon solvent, a silicone solvent, or a combination thereof.

[0135] In this embodiment, the solvent is a triglyceride solvent of formula (V). [ka]

[0136] During the ceremony

[0137] R 5 , R 6 , and R 7 Each of these is independently C1~C 35 Alkyl alkyl groups, C1-C 35 Heteroalkyl groups, C2-C 35 Alkene group, or C2~C 35 It is a heteroalkene group.

[0138] In this embodiment, the solvent is of formula (V), where R 5 , R 6 , and R 7 These are independently C2~C 17 Alkyl group or C2-C 17 It is an alkylene group.

[0139] In an embodiment, the solvent is a triglyceride solvent selected from the group consisting of caprylic / capric triglyceride, triheptanoin, corn oil, soybean oil, olive oil, rapeseed oil, cottonseed oil, coconut oil, almond oil, argan oil, rosehip seed oil, black seed oil, grape seed oil, avocado oil, apricot kernel oil, geranium oil, lavender oil, rosehip oil, macadamia nut oil, eucalyptus oil, sardine oil, herring oil, safflower oil, linseed oil, sunflower oil, olive oil, canola oil, sesame oil, cottonseed oil, palm oil, rapeseed oil, tung oil, fish oil, peanut oil, cuphea oil, kapok oil, achesonia oil, whale oil, castor oil, and combinations thereof. In an embodiment, the triglyceride solvent is selected from caprylic / capric triglyceride, triheptanoin, and combinations thereof.

[0140] In an embodiment, the solvent is a monoester solvent of formula (VI).

Chemical formula

[0141] Wherein

[0142] R 8 and R 9 each is independently a C1-C 35 alkyl group, a C1-C 35 heteroalkyl group, a C2-C 35 alkene group, or a C2-C 35 heteroalkene group.

[0143] In an embodiment, the solvent is a monoester solvent of formula (VI), wherein R 8 is a C5-C 17 alkyl group or a C5-C 17 alkene group, and R 9 is a C2-C 17 alkyl group or a C2-C 17 alkene group.

[0144] In this embodiment, the solvent is caprylic / capric triglyceride, capric triglyceride, jojoba oil, jojoba esters, isopropyl jojobate, macadamia nut oil ethyl, isoamyl laurate, heptyl undecylenate, methylheptyl isostearate, isostearyl isostearate, glyceryl ricinoleate, isostearyl palmitate, myristyl myristate, octyldodecyl myristate, octyldodecyl hydroxystearate, myristyl Butyl phosphate, coconut oil ethylhexyl acid, ethylhexyl palmitate, ethylhexyl stearate, butyl stearate, decyl oleate, isocetyl behenate, isocetyl myristate, isocetyl palmitate, isocetyl stearate, isodecyl oleate, isopropyl isostearate, isopropyl myristate, isopropyl palmitate, oleyl oleate, propylene glycol laurate, octyldodecyl erucate, alkyl lactate C 12 ~C 13 , alkyl lactate C 12 ~C 15 Isostearyl lactate, glycereth-5 lactate, lauryl lactate, myristyl lactate, oleyl lactate, laureth-2 benzoate, alkyl C benzoate 12 ~C 15 , benzoic acid C 12 ~C 15 Pareth-3, Dipropylene Glycol Benzoate, Isodecyl Salicylate, Alkyl C Salicylate 12 ~C 15, a monoester solvent selected from the group consisting of tridecyl salicylate, ethylhexyl isononanoate, cetyl ethylhexanoate, isononyl isononanoate, isodecyl ethylhexanoate, isodecyl isononanoate, tridecyl ethylhexanoate, isotridecyl isononanoate, isostearyl isononanoate, cetearyl isononanoate, laureth-2 ethylhexanoate, cetearyl ethylhexanoate, isodecyl neopentanoate, isostearyl neopentanoate, myristyl neopentanoate, isostearyl behenate, octyldodecyl neopentanoate, tridecyl neopentanoate, and combinations thereof. In an embodiment, the monoester solvent is caprylic / capric cocoalkyl, caprylic cocoalkyl, jojoba oil, isoamyl laurate, methylheptyl isostearate, alkyl lactate C 12 ~C 13 , alkyl lactate C 12 ~C 15 , lauryl lactate, ethylhexyl isononanoate, cetyl ethylhexanoate, isononyl isononanoate, isodecyl ethylhexanoate, isodecyl isononanoate, tridecyl ethylhexanoate, isotridecyl isononanoate, isostearyl isononanoate, cetearyl isononanoate, and combinations thereof selected from the group consisting of.

[0145] In an embodiment, the monoester solvent is selected from the group consisting of caprylic / capric cocoalkyl, caprylic cocoalkyl, isoamyl laurate, isononyl isononanoate, heptyl undecylenate, jojoba oil, jojoba ester, and combinations thereof.

[0146] In an embodiment, the solvent is:

[0147] (a) a diester solvent of formula (VII)

Chemical formula

[0148] wherein

[0149] R10 is C1~C 35 Alkyl alkyl groups, C1-C 35 Heteroalkyl groups, C2-C 35 Alkene group, or C2~C 35 Heteroalkene group; and

[0150] R 11 and R 12 These are independently C1~C 35 Alkyl alkyl groups, C1-C 35 Heteroalkyl groups, C2-C 35 Alkene group, or C2~C 35 heteroalkene group; or

[0151] (b) Diester solvent of formula (VIII) [ka]

[0152] During the ceremony

[0153] R 10 is C1~C 35 Alkyl alkyl groups, C1-C 35 Heteroalkyl groups, C2-C 35 Alkene group, or C2~C 35 Heteroalkene group; and

[0154] R 11 and R 12 H, C1~C are independent. 35 Alkyl alkyl groups, C1-C 35 Heteroalkyl groups, C2-C 35 Alkene group, or C2~C 35 heteroalkene group; or

[0155] (c) Diester solvent of formula (IX) [ka]

[0156] During the ceremony

[0157] R 10 is C1~C 35 Alkyl alkyl groups, C1-C 35 Heteroalkyl groups, C2-C 35 Alkene group, or C2~C 35 Heteroalkene group; and

[0158] R 11 and R 12 These are independently C1~C 35 Alkyl alkyl groups, C1-C 35 Heteroalkyl groups, C2-C 35 Alkene group, or C2~C 35 It is a heteroalkene group.

[0159] In this embodiment, the solvent is a diester solvent of formula (VII), formula (VIII), or formula (IX), where R 10 is C2~C 10 Alkyl group or C2-C 10 Alkene group, and R 11 and R 12 These are independently C1~C 12 Alkyl group or C2-C 12 It is an alkene group.

[0160] In an embodiment, the diester solvent is selected from the group consisting of diethyl succinate, dibutyl succinate, diethylhexyl succinate, diisopropyl sebacate, dimethyl sebacate, diethyl sebacate, dibutyl sebacate, diisostearyl dimer, diisostearyl malate, isostearyl stearoyl stearate, isocetyl stearoyl stearate, octyldodecyl stearoyl stearate, diethylhexyl malate, diethylhexyl maleate, dipropylene glycol dibenzoate, dicapryl adipate, dicaprylyl maleate, diisopropyl dimer, diisopropyl adipate, diisobutyl adipate, diisopropyl sebacate, diisostearyl dimer, diethylhexyl succinate, diethylene glycol diethylhexanoate, neopentyl glycol dicaprate, propylene glycol dicaprylate / caprate, neopentyl glycol diisostearate, neopentyl glycol diethylhexanoate, neopentyl glycol diheptanoate, and combinations thereof.

[0161] In an embodiment, the diester solvent is selected from the group consisting of dicapryl adipate, dicaprylyl maleate, diisopropyl adipate, diisobutyl adipate, diethyl succinate, dibutyl succinate, diethylhexyl succinate, diisopropyl sebacate, dimethyl sebacate, diethyl sebacate, dibutyl sebacate, neopentyl glycol diethylhexanoate, neopentyl glycol diheptanoate, and combinations thereof.

[0162] In an embodiment, the solvent is a citric acid ester solvent of formula (X)

Chemical formula

[0163] Wherein

[0164] R 13 、R 14 、R 15 、and R 16 are independently H, C1 - C35 Alkyl alkyl groups, C1-C 35 Heteroalkyl groups, C2-C 35 Alkene group, or C2~C 35 It is a heteroalkene group.

[0165] In this embodiment, the solvent is a citrate ester solvent of formula (X), where R 13 , R 14 , and R 15 These are independently C1~C 10 Alkyl group or C2-C 10 Alkene group, and R 16 It is an acetyl group.

[0166] In this embodiment, the solvent is a citrate ester solvent selected from the group consisting of tricaprylyl citrate, triisostearyl citrate, triisocetyl citrate, trioctyldodecyl citrate, triethyl citrate, tributyl citrate, acetyltriethyl citrate, acetyltributyl citrate, trioctyldodecyl citrate, triisocetyl citrate, and combinations thereof.

[0167] In this embodiment, the solvent is an ether solvent of formula (XI). [ka]

[0168] During the ceremony

[0169] R 17 and R 18 These are independently C2~C 20 Alkyl alkyl groups, C2-C 20 Heteroalkyl groups, C2-C 20 Alkene group, or C2~C 20 heteroalkene group

[0170] In this embodiment, the solvent is an ether solvent of formula (XI), where R 17 and R 18 These are independently C2~C 20 It is an alkyl group.

[0171] In this embodiment, the solvent is an ether solvent selected from the group consisting of dicaprylyl ether, didecyl ether, panthenyl ethyl ether, dicetyl ether, dimyristyl ether, distearyl ether, distearyl ether, dilauryl ether, and combinations thereof.

[0172] In this embodiment, the ether solvent is selected from the group consisting of dicaprylyl ether, didecyl ether, and combinations thereof.

[0173] In this embodiment, the solvent is a carbonate solvent of formula (XII). [ka]

[0174] During the ceremony

[0175] R 19 and R 20 These are independently C2~C 20 Alkyl alkyl groups, C2-C 20 Heteroalkyl groups, C2-C 20 Alkene group, or C2~C 20 It is a heteroalkene group.

[0176] In this embodiment, the solvent is a carbonate solvent of formula (XII), where R 19 and R 20 These are independently C2~C 20 It is an alkyl group.

[0177] In this embodiment, the solvent is a carbonate solvent selected from the group consisting of dicaprylyl carbonate, diethylhexyl carbonate, and combinations thereof.

[0178] In this embodiment, the solvent has a number of carbon atoms from C4 to C 60 It is a hydrocarbon. In another embodiment, the solvent has a number of carbon atoms C 10 From C 50It is a hydrocarbon. In a further embodiment, the solvent has a number of carbon atoms C 20 From C 40 It is a hydrocarbon.

[0179] In this embodiment, the solvent is farnesene, hydrogenated farnesene, coconut alkanes, coconut / palm kernel alkanes, C9-C 12 Alkane, C 10 ~C 13 Alkane, C 12 ~C 17 Alkane, C 13 ~C 14 Alkane, C 13 ~C 15 Alkane, C 14 ~C 17 Alkane, C 14 ~C 19 Alkane, C 14 ~C 20 Alkane, C 14 ~C 22 Alkane, C 15 ~C 19 Alkane, C 21 ~C 28 Alkane, C 17 ~C 23 Alkane, C9~C 12 Isoalkanes, C9~C 13 Isoalkanes, C9~C 14 Isoalkanes, C9~C 16 Isoalkanes, C 10 ~C 11 Isoalkanes, C 10 ~C 12 Isoalkanes, C 10 ~C 13 Isoalkanes, C 11 ~C 12 Isoalkanes, C 11 ~C 13 Isoalkanes, C 11 ~C 14 Isoalkanes, C 12 ~C 14 Isoalkanes, C 12 ~C 15 Isoalkanes, C 12 ~C 20 Isoalkanes, C 13 ~C 14Isoalkanes, C 13 ~C 16 Isoalkanes, C 14 ~C 16 Isoalkanes, C 15 ~C 19 Isoalkanes, C 10 ~C 16 Olefin, C 12 ~C 18 Olefin, C 18 ~C 26 Olefin, C 20 Olefin, C 20 ~C 24 Olefin, C 24 ~C 30 Olefin, C 26 ~C 28 Olefin, C 26 ~C 54 Olefin, C 28 ~C 36 Olefin, C 28 ~C 52 Olefin, C 30 ~C 38 Olefin, C 30 ~C 45 Olefins, C4~C 12 Olefins, C4-C6 olefins, C5-C6 olefins, hydrogenated poly(C6 / C) 10 / C 14 Olefins), hydrogenated poly(C6~C 12 Olefins), hydrogenated poly(C6~C 14 Olefins), hydrogenated poly(C6~C 20 Olefin), Hydrogenated Poly(C8 / C) 12 Olefin), Poly(C 20 ~C 28 Olefin), Poly(C 30 ~C 45 Olefin), Poly(C4~C 12 Olefin), Poly(C6~C 14 Olefin), hexadecene, C 32 Alkane, C 32 Isoalkanes, C 54 Alkane, C 54The hydrocarbon solvent is selected from the group consisting of isoalkanes, diethylhexylcyclohexane, undecane, tridecane, tetradecane, pentadecane, hexadecane, octadecane, docosane, squalane, hydrogenated polyisobutene, polybutene, hydrogenated polydecene, hydrogenated didecene, mineral oil, liquidum, petrolatum, dodecane, isohexadecane, isododecane, isoeicosane, and combinations thereof. In this embodiment, the hydrocarbon solvent is squalane, farnesene, hydrogenated farnesene, coconut alkanes, C9-C 12 Alkane, C 13 ~C 15 Alkane, C 14 ~C 19 Alkane, C 14 ~C 20 Alkane, C 14 ~C 22 Alkane, C 15 ~C 19 Alkane, C 13 ~C 16 Isoalkane, dodecane, undecane, tridecane, tetradecane, pentadecane, hexadecane, hexadecene, octadecane, squalane, isododecane, isohexadecane, C 32 Alkane, C 32 Isoalkanes, C 54 Alkane, C 54 The hydrocarbon solvent is selected from the group consisting of isoalkanes and combinations thereof. In this embodiment, the hydrocarbon solvent is squalane, farnesene hydrogenate, coconut alkanes, C9-C 12 Alkane, C 13 ~C 15 Alkane, C 13 ~C 16 Isoalkanes, C 14 ~C 19 Alkanes, dodecane, tetradecane, isododecane, hexadecane, octadecane, hexadecene, C 32 Alkane, C 32 Isoalkanes, C 54 Alkane, C 54 The selection is made from the group consisting of isoalkanes and combinations thereof.

[0180] In this embodiment, the hydrocarbon solvent is squalane, C 32 Alkane, C 32 Isoalkanes, C 54 Alkane, C 54 The selection is made from the group consisting of isoalkanes and combinations thereof.

[0181] In this embodiment, the solvent is a silicone solvent selected from the group consisting of dimethicone, phenyl dimethicone, caprylyl methicone, ethyl trisiloxane, cyclotetrasiloxane, cyclopentasiloxane, cyclohexasiloxane, and combinations thereof.

[0182] In this embodiment, the first solvent is any solvent described in this application.

[0183] In one embodiment, the first solvent in the reaction is present in an amount of about 0% to about 90% of the total weight. In another embodiment, the first solvent in the reaction is present in an amount of about 10% to about 85% of the total weight of the carboxylic acid, alcohol, and solvent. In yet another embodiment, the first solvent in the reaction is present in an amount of about 10%, about 15%, about 20%, about 25%, about 30%, about 35%, about 40%, about 45%, about 50%, about 55%, about 60%, about 65%, about 70%, about 75%, about 80%, or about 85% of the total weight.

[0184] In this embodiment, the second solvent is any solvent described in this application.

[0185] In one embodiment, the second solvent in the reaction is present in an amount of about 0% to about 90% of the total weight. In another embodiment, the second solvent in the reaction is present in an amount of about 10% to about 85% of the total weight of the carboxylic acid, alcohol, and solvent. In yet another embodiment, the second solvent in the reaction is present in an amount of about 10%, about 15%, about 20%, about 25%, about 30%, about 35%, about 40%, about 45%, about 50%, about 55%, about 60%, about 65%, about 70%, about 75%, about 80%, or about 85% of the total weight. 5.Temperature

[0186] In one embodiment, the reaction occurs at a temperature of approximately 25°C to approximately 150°C. In another embodiment, the reaction occurs at a temperature of approximately 30°C to approximately 125°C, or at a temperature of approximately 40°C to approximately 100°C. In yet another embodiment, the reaction occurs at a temperature of approximately 25°C, approximately 30°C, approximately 40°C, approximately 60°C, approximately 65°C, approximately 70°C, approximately 75°C, approximately 80°C, approximately 85°C, approximately 90°C, approximately 95°C, approximately 100°C, approximately 105°C, approximately 110°C, or approximately 150°C. 6. Time

[0187] In some cases, the reaction time is approximately 1 hour to 72 hours. In some cases, the reaction time is approximately 6 hours to 24 hours. In some cases, the reaction time is approximately 8 hours to 27 hours. In some cases, the reaction time is approximately 6 hours, 6.5 hours, 7 hours, 7.5 hours, 8 hours, 8.5 hours, 9 hours, 9.5 hours, 10 hours, 10.5 hours, 11 hours, 11.5 hours, 12 hours, 12.5 hours, 13 hours, 13.5 hours, 14 hours, 14.5 hours, 15 hours, 15.5 hours, 16 hours, 16. 5 hours, approximately 17 hours, approximately 17.5 hours, approximately 18 hours, approximately 18.5 hours, approximately 19 hours, approximately 19.5 hours, approximately 20 hours, approximately 20.5 hours, approximately 21 hours, approximately 21.5 hours, approximately 22 hours, approximately 22.5 hours, approximately 23 hours, approximately 23.5 hours, approximately 24 hours, approximately 24.5 hours, approximately 25 hours, approximately 25.5 hours, approximately 26 hours, approximately 26.5 hours, or approximately 27 hours. 7. Gel or paste

[0188] In one embodiment, the elastomer described herein is used to prepare a gel, paste, film, or powder composition by the method described herein. In one embodiment, a uniform polyester elastomer is pulverized to form an elastomer powder. In another embodiment, the uniform polyester elastomer is processed into a gel or paste. In yet another embodiment, the uniform polyester elastomer is a gel.

[0189] In this embodiment, the polyester elastomer is mixed with a solvent prior to being processed to create a gel.

[0190] In this embodiment, the polyester elastomer is swollen in a solvent prior to being processed to form a gel. In this embodiment, the swelling time of the polyester elastomer in the solvent is from 1 hour to 1 week.

[0191] In this embodiment, a mixture of polyester elastomer and solvent is treated with a homogenizer to produce a gel.

[0192] In the embodiment, the viscosity, modulus of elasticity, and particle size of the gel are as described in this application. IV. Personal Care Formulas

[0193] In embodiments of this disclosure, the elastomer composition described herein is incorporated into a personal care formulation. In embodiments, a gel prepared from the elastomer described herein is incorporated into a personal care formulation.

[0194] In this embodiment, the personal care formulation further comprises preservatives, antioxidants, chelating agents, gums or thickeners, oils, waxes, fragrances, essential oils, emulsifiers, surfactants, and combinations thereof.

[0195] In this embodiment, the personal care formulation is a deodorant, antiperspirant, skin cream, facial cream, hair shampoo, hair conditioner, mousse, hair styling gel, hair spray, protective cream, lipstick, face foundation, blush, makeup, mascara, skincare lotion, moisturizer, facial treatment, personal cleanser, facial wash, bath oil, perfume, shaving cream, pre-shave lotion, after-shave lotion, cologne, sachet, or sunscreen formulation. V. Additional formulations

[0196] In this embodiment, the product of the present disclosure, namely the crosslinked polyester elastomer, is added to a formulation containing a drug, biocide, herbicide, insecticide, or other biologically active substance.

[0197] In embodiments, the products of the Disclosure, i.e., crosslinked polyester elastomers, are used to introduce water and water-soluble substances into a hydrophobic system. In embodiments, the products of the Disclosure, i.e., crosslinked polyester elastomers, modify the rheological properties, physical properties, or energy absorption properties of an oil phase to either an untreated or a finished state. VI. Use of Gel

[0198] In one embodiment, the disclosure relates to the use of the gel described herein in a personal care formulation. Examples

[0199] The following embodiments are included to illustrate various aspects of the present disclosure. Those skilled in the art will understand that the technologies disclosed in the following embodiments represent technologies found by the inventors to function well in the implementation of the disclosure and thus constitute preferred embodiments. However, those skilled in the art will understand that, in view of the present disclosure, many modifications can be made to the disclosed examples to obtain similar or similar results without departing from the spirit and scope of the present disclosure. Example 1: Esterification for preparing polyester elastomer

[0200] Hydrogenated castor oil (141.0 g, 150.07 mmol) and hydrogenated dimer acid (109.1 g, 194.50 mmol) were added to a reaction vessel equipped with a heating mantle, overhead stirrer, reflux condenser, addition funnel, and thermocouple, and flushed with nitrogen. The contents were stirred and heated at 100°C for 1 hour. Titanium(IV) isopropoxide (1.38 g, 3.5 mmol) was added, and stirring was continued at 100°C. Ditert-butyl dicarbonate (DIBOC) (55.2 g, 252.92 mmol) was added to this mixture, and stirring was continued for a further 4.5 hours. At this point, the contents of the reaction mixture changed into a viscous gum. 1 Analysis using 1H NMR technique showed that approximately 60% of the starting monomer was converted without any side reactions. To further accelerate the reaction, an additional amount of DIBOC (28.28 g, 129.57 mmol) was added to the stirred mixture, and heating was continued at 100°C for 3 hours, at which point the entire mixture was converted into rubber. Analysis of this rubber by FTIR revealed that the starting monomer had a temperature of 3000-3500 cm². -1 The disappearance of the OH frequency indicated that the monomer had been completely converted. Rheological analysis showed that the rubber had an elastic modulus (G') of approximately 16,819 Pa. Example 2: Esterification for preparing polyester elastomer

[0201] Hydrogenated castor oil (141.0 g, 150.07 mmol) and hydrogenated dimer acid (109.1 g, 194.50 mmol) were added to a reaction vessel equipped with a heating mantle, overhead stirrer, reflux condenser, addition funnel, and thermocouple, and flushed with nitrogen. The contents were stirred and heated at 100°C for 1 hour. Titanium(IV) isopropoxide (1.38 g, 3.5 mmol) was added, and stirring was continued at 100°C. Ditert-butyl dicarbonate (DIBOC) (55.2 g, 252.92 mmol) was added to this mixture, and stirring was continued for a further 4.5 hours, at which point the entire reaction mixture transformed into a viscous gum. At this point, hemisqualane (500.0 g) and DIBOC (22.5 g, 103.09 mmol) were added to the mixture, and stirring was continued at 75°C for 5 hours until the entire mixture transformed into an elastomer powder. Deionized (DI) water (5.0 g) was added, and stirring was continued at 75°C for 1 hour. Unreacted water and volatile by-products were stripped off under low pressure at 75°C. Detailed characterization of the powder sample using FTIR showed complete conversion from monomer to crosslinked polyester. Rheological analysis of the powder sample showed that the rubber had an elastic modulus (G') of approximately 16,017 Pa. Example 3: Esterification for preparing polyester elastomer

[0202] Hydrogenated castor oil (141.0 g, 150.08 mmol) and hydrogenated dimer acid (109.1 g, 194.50 mmol) were added to a reaction vessel equipped with a heating mantle, overhead stirrer, reflux condenser, addition funnel, and thermocouple, and flushed with nitrogen. The contents were stirred and heated at 100°C for 1 hour. Titanium(IV) isopropoxide (1.38 g, 4.8 mmol) was added, and stirring was continued at 100°C. Ditert-butyl dicarbonate (DIBOC) (55.2 g, 252.92 mmol) was added to this mixture, and stirring was continued for a further 4.5 hours until the entire reaction mixture transformed into a viscous gum. At this point, hemisqualane (500.0 g) and DIBOC (22.5 g, 103.09 mmol) were added to the mixture, and stirring was continued at 75°C. After 5 hours, an additional 22.5 g of DIBOC (103.09 mmol) was added and mixed for 2.5 hours, at which point the entire mixture transformed into a sticky elastomer powder. 5.0 g of deionized (DI) water was added and the mixture was stirred at 75°C for 1 hour. Unreacted water and volatile by-products were stripped off under low pressure at 75°C. Rheological analysis of the powder sample showed that the rubber had an elastic modulus (G') of approximately 3829.7 Pa. Example 4: Esterification for preparing polyester elastomers

[0203] Hydrogenated castor oil (141.0 g, 150.08 mmol) and hydrogenated dimer acid (109.1 g, 194.50 mmol) were added to a reaction vessel equipped with a heating mantle, overhead stirrer, reflux condenser, addition funnel, and thermocouple, and flushed with nitrogen. The contents were stirred and heated at 100°C for 1 hour. Titanium(IV) isopropoxide (1.38 g, 4.8 mmol) was added, and stirring was continued at 100°C. Ditert-butyl dicarbonate (DIBOC) (55.2 g, 252.92 mmol) was added to this mixture, and stirring was continued for a further 4.5 hours until the entire reaction mixture transformed into a viscous gum. At this point, hemisqualane (500.0 g) and DIBOC (22.5 g, 103.09 mmol) were added to the mixture, and stirring was continued at 75°C. After 5 hours, an additional 22.5 g of DIBOC (103.09 mmol) was added and mixed for 4.5 hours, at which point the entire mixture transformed into a soft elastomer powder. 5.0 g of deionized (DI) water was added and the mixture was stirred at 75°C for 1 hour. Unreacted water and volatile by-products were stripped off under low pressure at 75°C. Rheological analysis of the powder sample showed that the rubber had an elastic modulus (G') of approximately 5135.6 Pa. Example 5: Esterification for preparing polyester elastomer

[0204] Hydrogenated castor oil (141.0 g, 150.08 mmol) and hydrogenated dimer acid (109.1 g, 194.50 mmol) were added to a reaction vessel equipped with a heating mantle, overhead stirrer, reflux condenser, addition funnel, and thermocouple, and flushed with nitrogen. The contents were stirred and heated at 100°C for 1 hour. Titanium(IV) isopropoxide (1.38 g, 4.8 mmol) was added, and stirring was continued at 100°C. Ditert-butyl dicarbonate (DIBOC) (55.2 g, 252.92 mmol) was added to this mixture, and stirring was continued for a further 4.5 hours until the entire reaction mixture transformed into a viscous gum. At this point, hemisqualane (500.0 g) and DIBOC (22.5 g, 103.09 mmol) were added to the mixture, and stirring was continued at 75°C. After 5 hours, an additional 22.5 g of DIBOC (103.09 mmol) was added and mixed for 5.5 hours, at which point the entire mixture transformed into a soft elastomer powder. 5.0 g of deionized (DI) water was added and the mixture was stirred at 75°C for 1 hour. Unreacted water and volatile by-products were stripped off under low pressure at 75°C. Rheological analysis of the powder sample showed that the rubber had an elastic modulus (G') of approximately 5900.8 Pa. Example 6: Esterification for preparing polyester elastomer

[0205] Hydrogenated castor oil (141.0 g, 150.08 mmol) and hydrogenated dimer acid (109.1 g, 194.50 mmol) were added to a reaction vessel equipped with a heating mantle, overhead stirrer, reflux condenser, addition funnel, and thermocouple, and flushed with nitrogen. The contents were stirred and heated at 100°C for 1 hour. Titanium(IV) isopropoxide (1.38 g, 4.8 mmol) was added, and stirring was continued at 100°C. Ditert-butyl dicarbonate (DIBOC) (55.2 g, 252.92 mmol) was added to this mixture, and stirring was continued for a further 4.5 hours until the entire reaction mixture transformed into a viscous gum. At this point, hemisqualane (500.0 g) and DIBOC (22.5 g, 103.09 mmol) were added to the mixture, and stirring was continued at 75°C. After 5 hours, an additional 22.5 g of DIBOC (103.09 mmol) was added and mixed for 6.5 hours, at which point the entire mixture transformed into a soft elastomer powder. 5.0 g of deionized (DI) water was added and the mixture was stirred at 75°C for 1 hour. Unreacted water and volatile by-products were stripped off under low pressure at 75°C. Rheological analysis of the powder sample showed that the rubber had an elastic modulus (G') of approximately 7749.9 Pa. Example 7: Esterification for preparing polyester elastomer

[0206] Hydrogenated castor oil (141.0 g, 150.08 mmol) and hydrogenated dimer acid (109.1 g, 194.50 mmol) were added to a reaction vessel equipped with a heating mantle, overhead stirrer, reflux condenser, addition funnel, and thermocouple, and flushed with nitrogen. The contents were stirred and heated at 100°C for 1 hour. Titanium(IV) isopropoxide (1.38 g, 4.8 mmol) was added, and stirring was continued at 100°C. Ditert-butyl dicarbonate (DIBOC) (55.2 g, 252.92 mmol) was added to this mixture, and stirring was continued for a further 4.5 hours until the entire reaction mixture transformed into a viscous gum. At this point, hemisqualane (500.0 g) and DIBOC (22.5 g, 103.09 mmol) were added to the mixture, and stirring was continued at 75°C. After 5 hours, an additional 22.5 g of DIBOC (103.09 mmol) was added and mixed for 11.5 hours, at which point the entire mixture transformed into a non-sticky elastomer powder. 5.0 g of deionized (DI) water was added and the mixture was stirred at 75°C for 1 hour. Unreacted water and volatile by-products were stripped off under low pressure at 75°C. Rheological analysis of the powder sample showed that the rubber had an elastic modulus (G') of approximately 8657 Pa. Example 8: Esterification for preparing polyester elastomers

[0207] Hydrogenated castor oil (141.0 g, 150.08 mmol) and hydrogenated dimer acid (109.1 g, 194.50 mmol) were added to a reaction vessel equipped with a heating mantle, overhead stirrer, reflux condenser, addition funnel, and thermocouple, and flushed with nitrogen. The contents were stirred and heated at 100°C for 1 hour. Titanium(IV) isopropoxide (1.38 g, 4.8 mmol) was added, and stirring was continued at 100°C. Ditert-butyl dicarbonate (DIBOC) (55.2 g, 252.92 mmol) was added to this mixture, and stirring was continued for a further 4.5 hours until the entire reaction mixture transformed into a viscous gum. At this point, hemisqualane (500.0 g) and DIBOC (22.5 g, 103.09 mmol) were added to the mixture, and stirring was continued at 75°C for 6 hours. Additional DIBOC (11.25 g, 51.54 mmol) was added and mixed for 1.5 hours, after which the entire mixture transformed into an elastomer powder. Rheological analysis of the powder sample showed that the rubber had an elastic modulus (G') of approximately 11,106 Pa. Deionized (DI) water (5.0 g) was added and stirred at 75°C for 1 hour. Unreacted water and volatile by-products were stripped off under low pressure at 75°C. Caprylic / capric triglyceride (GTCC) (1400 g) was added and homogenized at room temperature to obtain a soft, spreadable gel. Particle size analysis of the gel using optical microscopy showed that the gel contained particles with diameters ranging from 2 to 50 micrometers. Example 9: Esterification for preparing polyester elastomers

[0208] Hydrogenated castor oil (133.86 g, 142.48 mmol) and hydrogenated dimer acid (109.1 g, 194.50 mmol) were added to a reaction vessel equipped with a heating mantle, overhead stirrer, reflux condenser, addition funnel, and thermocouple, and flushed with nitrogen. The contents were stirred and heated at 100°C for 1 hour. Titanium(IV) isopropoxide (1.38 g, 4.8 mmol) was added, and stirring was continued at 100°C. Ditert-butyl dicarbonate (DIBOC) (55.2 g, 252.92 mmol) was added to this mixture, and stirring was continued for a further 6 hours, at which point the entire reaction mixture transformed into a viscous gum. At this point, HARMONIE Soft Fluid (C9~C) was added. 12 Alkane (500.0 g) and DIBOC (33.75 g, 154.63 mmol) were added to the mixture, and stirring was continued at 75°C for 5 hours. An additional DIBOC (11.25 g, 51.54 mmol) was added and mixed for 4 hours, at which point the entire mixture transformed into an elastomer powder. Deionized (DI) water (5.0 g) was added and stirred at 75°C for 1 hour. Unreacted water and volatile by-products were stripped off under low pressure at 75°C. Rheological analysis of the powder sample showed that the rubber had an elastic modulus (G') of approximately 5229 Pa. Example 10: Esterification for preparing polyester elastomer

[0209] Hydrogenated castor oil (133.86 g, 142.48 mmol) and hydrogenated dimer acid (109.1 g, 194.50 mmol) were added to a reaction vessel equipped with a heating mantle, overhead stirrer, reflux condenser, addition funnel, and thermocouple, and flushed with nitrogen. The contents were stirred and heated at 100°C for 1 hour. Titanium(IV) isopropoxide (1.38 g, 4.8 mmol) was added, and stirring was continued at 100°C. Ditert-butyl dicarbonate (DIBOC) (55.2 g, 252.92 mmol) was added to this mixture, and stirring was continued for a further 6 hours, at which point the entire reaction mixture transformed into a viscous gum. Additional DIBOC (11.25 g, mmol) was added, and the mixture was mixed for 5 hours. HARMONIE Soft Fluid (C9~C 12Alkane (250.0 g) and DIBOC (45 g, 103.09 mmol) were added to the mixture, and stirring was continued at 75°C for 7 hours until the entire mixture transformed into an elastomer powder. Deionized (DI) water (5.0 g) was added, and the mixture was stirred at 75°C for 1 hour. Unreacted water and volatile by-products were stripped off under low pressure at 75°C. Rheological analysis of the powder sample showed that the rubber had an elastic modulus (G') of approximately 6741 Pa. Example 11: Esterification for preparing polyester elastomer

[0210] Hydrogenated castor oil (141.0 g, 150.08 mmol) and hydrogenated dimer acid (109.1 g, 194.50 mmol) were added to a reaction vessel equipped with a heating mantle, overhead stirrer, reflux condenser, addition funnel, and thermocouple, and flushed with nitrogen. The contents were stirred and heated at 100°C for 1 hour. Titanium(IV) isopropoxide (1.38 g, 4.8 mmol) was added, and stirring was continued at 100°C. Ditert-butyl dicarbonate (DIBOC) (55.2 g, 252.92 mmol) was added to this mixture, and stirring was continued for a further 4.5 hours, at which point the entire reaction mixture transformed into a viscous gum. At this point, squalane (125.0 g, 295.63 mmol) and DIBOC (45 g, 103.09 mmol) were added to the mixture, and stirring was continued at 75°C for 7 hours until the entire reaction mixture transformed into an elastomer powder. Additional DIBOC (22.5 g, 103.09 mmol) was added, and mixing was continued at 75°C. After about 6 hours, Cetiol LC (397.5 g) and an additional amount of DIBOC (22.5 g, 103.09 mmol) were added, and mixing was carried out for 5.5 hours. Deionized (DI) water (5.0 g) was added, and the mixture was stirred at 75°C for 1 hour. Unreacted water and volatile by-products were stripped off under low pressure at 75°C. Rheological analysis of the powder sample showed that the rubber had an elastic modulus (G') of approximately 8929 Pa. Example 12: Esterification for preparing polyester elastomer

[0211] Hydrogenated castor oil (141.0 g, 150.08 mmol) and hydrogenated dimer acid (109.1 g, 194.50 mmol) were added to a reaction vessel equipped with a heating mantle, overhead stirrer, reflux condenser, addition funnel, and thermocouple, and flushed with nitrogen. The contents were stirred and heated at 100°C for 1 hour. Titanium(IV) isopropoxide (1.38 g, 4.8 mmol) was added, and stirring was continued at 100°C. Ditert-butyl dicarbonate (DIBOC) (55.2 g, 252.92 mmol) was added to this mixture, and stirring was continued for a further 4.5 hours, at which point the entire reaction mixture transformed into a viscous gum. At this point, Cetiol LC (125.0 g) and DIBOC (45 g, 206.19 mmol) were added to the mixture, and stirring was continued at 75°C for 3 hours until the entire mixture transformed into an elastomer powder. Additional Cetiol LC (125.5 g) and DIBOC (22.5 g, 103.09 mmol) were added and mixed for 2 hours. Deionized (DI) water (5.0 g) was added and stirred at 75°C for 1 hour. Unreacted water and volatile by-products were stripped off under low pressure at 75°C. Rheological analysis of the powder sample showed that the rubber had an elastic modulus (G') of approximately 15,249.7 Pa. Example 13: Esterification for preparing polyester elastomers

[0212] Hydrogenated castor oil (218.0 g, 232.0 mmol) and hydrogenated dimer acid (281.82 g, 502.4 mmol) were added to a reaction vessel equipped with a heating mantle, overhead stirrer, reflux condenser, addition funnel, and thermocouple, and flushed with nitrogen. The contents were stirred and heated at 100°C for 1 hour. Titanium(IV) isopropoxide (2.76 g, 9.7 mmol) was added, and stirring was continued at 100°C. Ditert-butyl dicarbonate (DIBOC) (55.2 g, 252.92 mmol) was added to this mixture, and stirring was continued for a further 6 hours, at which point the entire reaction mixture transformed into a viscous gum. At this point, Cetiol LC (250.0 g) and DIBOC (45 g, 103.09 mmol) were added to the mixture, and stirring was continued at 75°C for 3 hours, after which the entire mixture transformed into an elastomer powder. Rheological analysis of the powder sample showed that the rubber had an elastic modulus (G') of approximately 6945.96 Pa. Example 14: Esterification for preparing polyester elastomers

[0213] Hydrogenated castor oil (141.0 g, 150.08 mmol) was added to a reaction vessel equipped with a heating mantle, overhead stirrer, reflux condenser, addition funnel, and thermocouple, and flushed with nitrogen. The contents were stirred and heated at 100°C for 1 hour. Titanium(IV) isopropoxide (1.38 g, 3.5 mmol) was added, and stirring was continued at 100°C for 5 minutes. A premix of hydrogenated dimer acid (109.1 g, 194.50 mmol) and di-tert-butyl dicarbonate (DIBOC) (55.2 g, 252.92 mmol) was added to this mixture, and stirring was continued for a further 6 hours, at which point the entire reaction mixture transformed into a viscous gum. At this point, Cetiol LC (125.0 g) and DIBOC (45 g, 103.09 mmol) were added to the mixture, and stirring was continued at 75°C for 7 hours until the entire mixture transformed into an elastomer powder. Deionized (DI) water (5.0 g) was added, and the mixture was stirred at 75°C for 1 hour. Unreacted water and volatile by-products were stripped off under low pressure at 75°C. Rheological analysis of the powder sample showed that the rubber had an elastic modulus (G') of approximately 26611 Pa. Example 15: Swelling of polyester elastomer for preparation of polyester gel

[0214] 25 g of the elastomer powder obtained in Synthesis Example 11 and 75 g of Cetiol LC were added to a beaker and stirred at room temperature for 2 hours. The mixture was then subjected to high-shear mixing using a Silverson high-shear rotor / stator laboratory mixer to produce a very smooth, creamy, translucent gel of high viscosity. Optical microscopy analysis of the gel showed that it had an average particle size of 20 micrometers. Rheological analysis of the gel sample showed an elastic modulus (G') of approximately 2540 Pa. Example 16: Esterification for preparing polyester elastomers

[0215] 100 g of dimer acid was added to a suitable container equipped with a stirrer, a heating device, and the ability to distill off volatile alcohols. Next, 60 g of di-tert-butyl dicarbonate was added as a coupling agent. After charging all components under stirring, the temperature was raised to 110°C, and water, t-butanol, and carbon dioxide were removed by distillation as they were formed. The temperature was maintained for 12 hours before adding an additional 60 g of di-tert-butyl dicarbonate to the container. The temperature was maintained for another 12 hours, or until gelation occurred, to form a polymer elastomer. Example 17: Esterification for preparing polyester elastomers

[0216] 100 g of dimer acid was added to a suitable container equipped with a stirrer, a heating device, and the ability to distill off volatile alcohols, along with 17 g of diglycerin and 30 g of squalane. Next, 70 g of di-tert-butyl dicarbonate was added as a coupling agent. After charging all components under stirring, the temperature was raised to 110°C, and water, t-butanol, and carbon dioxide were removed by distillation as they were formed. The temperature was maintained for 12 hours before adding an additional 70 g of di-tert-butyl dicarbonate to the container. The temperature was maintained for a further 12 hours, or until gelation occurred, to form a polymer elastomer. Example 18: Esterification for preparing polyester elastomers

[0217] 100 g of dimer acid was added to a suitable container equipped with a stirrer, a heating device, and the ability to distill off volatile alcohols, along with 17 g of diglycerin, 7 g of oleic acid, and 30 g of squalane. Next, 70 g of di-tert-butyl dicarbonate (DIBOC) was added as a coupling agent. After charging all components under stirring, the temperature was raised to 110°C, and water, t-butanol, and carbon dioxide were removed by distillation as they were formed. The temperature was maintained for 12 hours before adding an additional 70 g of di-tert-butyl dicarbonate to the container. The temperature was maintained for a further 12 hours, or until gelation occurred, to form a polymer elastomer. Comparative Example 19: Esterification for preparing polyester elastomers

[0218] Hydrogenated castor oil (141.0 g, 150.07 mmol) and hydrogenated dimer acid (109.1 g, 194.50 mmol) were added to a reaction vessel equipped with a heating mantle, overhead stirrer, reflux condenser, addition funnel, and thermocouple, and flushed with nitrogen. The stirred contents were heated to 150°C for 1 hour. Concentrated sulfuric acid (2.5 g, 2.54 mmol) was added, and stirring was continued at 100°C for 4.5 hours. At this point, the color of the reaction mixture changed from pale yellow to dark brown. 1 Analysis using 1H NMR technique indicated the presence of undesirable by-products. Cetiol LC (125.0 g) was added to this colored mixture, and stirring was continued at 150°C for 20 hours. At this point, no formation of elastomer powder was observed. The volatile by-products were then stripped off under low pressure at 75°C. Rheological analysis of the crude product showed that the material had an elastic modulus (G') of approximately 7.0 Pa. Example 20: Preparation of face serum

[0219] Phase A was weighed into the main container and mixed under regular stirring until homogenized. Phase B was weighed into the container and mixed until homogenized. Phase B was added to the main kettle while homogenizing and mixed until homogenized. Phase C was added to phases A and B and mixed until homogenized. See Table 1 for details of the formulation. [Table 1] Example 21: Preparation of lotion

[0220] Phase A was weighed into the main container and mixed under regular stirring until homogenized, then heated to 70°C. Phase B was weighed into the container and mixed until homogenized, then heated to 70°C. Phase B was added to the main kettle while homogenizing and mixed until homogenized. Phase C was added to phases A and B and mixed until homogenized. See Table 2 for details of the formulation. [Table 2] Example 22: Preparation of gel cream

[0221] Phase A was weighed into the main container and mixed under regular stirring until homogenized. Phase B was weighed into the container and mixed until homogenized. Phase B was added to the main kettle while homogenizing and mixed until homogenized. Phase C was added to phases A and B and mixed until homogenized. See Table 3 for details of the formulation. [Table 3] Example 23: Basic formulation of a sheet mask

[0222] A water dispersion of xanthan gum and carbomer was prepared, then the remaining components of Phase A and qs (as needed) of water were added to reach 100%, and the mixture was homogenized for a short time to ensure that all components were well dispersed. Phase B was mixed together until homogeneous, and then added to Phase A. Phase C was then added as needed to reach 100%, and mixed until homogeneous. See Table 4 for details of the formulation. [Table 4] Example 24: Preparation of color correction (CC) cream

[0223] Phase A was heated to 85°C until all components were completely dissolved. The components of Phase B were mixed in a homogenizer. Phase C was added to Phase B and mixed thoroughly. Phases BC were added to Phase A while homogenizing and mixed thoroughly until homogeneous. The components of Phase D were mixed and added dropwise to Phases A, B, and C while stirring to ensure that the aqueous phase was well dispersed (water was added as needed until 100%). Phase E was added while stirring until homogeneous. See Table 5 for details of the formulation. [Table 5] Example 25: Preparation of sunscreen spray

[0224] Phase A was mixed until uniform while stirring. A premix of Phase B was prepared and added to Phase A, and thoroughly mixed. The components of Phase C were added one by one to Phases A and B while stirring until uniform. See Table 6 for details of the formulation. [Table 6] Example 26: Preparation of skin cream

[0225] Phase A and the required amount of water to reach 100% were mixed while stirring until homogeneous, and then heated to 70-75°C. A premix of Phase B was prepared, heated to 70-75°C, and thoroughly mixed. A premix of Phase C was prepared and added to Phase B, and Phases B and C were heated until homogeneous. Phases B and C were added to Phase A while homogenizing, and thoroughly mixed for 5 minutes. The required amount of Phase D to reach 100% was added to Phases A, B, and C one by one, and thoroughly mixed. See Table 7 for details of the formulation. [Table 7] Example 27: Preparation of cream

[0226] Phase A and the required amount of demineralized water to reach 100% were mixed with stirring until homogeneous and heated to 75-80°C. The components of Phase B were mixed and heated to 75-80°C. When both phases reached 75-80°C, Phase A was homogenized for 2 minutes. Phase B was gradually added to Phase A and homogenized for 5 minutes. Homogenization was stopped and the base was cooled with normal stirring. When the temperature fell below 60°C, the components of Phase C were added one by one and thoroughly mixed. The components of Phase E were added one by one to this mixture. Below 40°C, the required amount of flavoring to reach 100% was added and thoroughly mixed until homogeneous, and the mixture was stored in an airtight container. See Table 8 for details of the formulation. [Table 8] Example 28: Preparation of a liquid formulation

[0227] All components of Phase A and the amount of desalted DM water required to reach 100% were mixed until homogeneous, and then Phase A was heated to 75-80°C. The components of Phase B were pre-mixed, and then the components of Phase C were added to Phase B. All components of Phase D were mixed and then heated to 75-80°C. Next, Phase BC was added to Phase D and mixed thoroughly, and the mixture was heated to 75°C. Upon reaching this temperature, Phase BCD was added to Phase A and mixed while homogenizing for 5 minutes. The components of Phase E were added one by one to Phases A, B, C, and D at temperatures below 60°C. The fragrance was added and mixed while homogenizing, and the mixture was stored in an airtight container. See Table 9 for details of the formulation. [Table 9] Example 29: Preparation of foundation cream

[0228] The powder was moistened with isononyl isononanoate. Then, the remaining components of Phase A and the required amount of Phase B up to 100% were added and mixed. See Table 10 for details of the formulation. [Table 10] Example 30: Preparation of concealer

[0229] All ingredients were mixed using a blender and heated to 80-90°C. After confirming that the oil thickener had dissolved, the mixture was poured into a wide-mouthed bottle and allowed to cool. See Table 11 for details of the formulation. [Table 11] Example 31: Preparation of lipstick

[0230] Phase A and the required amount of castor oil up to 100% were mixed in the main kettle while stirring, and heated to 90-95°C until uniform. The mixture was then poured into molds at 75-80°C. See Table 12 for details of the formulation. [Table 12] Other embodiments

[0231] All publications, patents, and patent applications referenced herein are incorporated in whole by reference to the same extent as each individual publication, patent, or patent application is incorporated in whole by reference, specifically and individually. Where it is found that a term in this application has a different definition from that in a document incorporated by reference, the definition presented herein shall be used as the definition of that term.

[0232] While the present invention has been described in relation to its particular embodiments, it is understood that this disclosure is subject to further modification, and this application is intended to encompass all modifications, uses, or adaptations of the present invention, including developments of this disclosure that are known or commonly used in the art to which the present invention belongs, applicable to the essential features described herein, and subject to the claims, in accordance with the principles of the present invention in general.

Claims

1. It is an elastomer: (i) at least one activated polycarboxylic acid; and (ii) comprising a reaction product of at least one polyol; Hereinafter, (a) at least one activated polycarboxylic acid and at least one polyol have a total of at least five carboxyl and hydroxyl functional groups; and (b) at least three carboxyl or hydroxyl functional groups are present in at least one activated polycarboxylic acid or at least one polyol, an elastomer.

2. At least one activated polycarboxylic acid is a compound of formula (I) 【Chemistry 19】 During the ceremony R １ is C ２ to C ２００ alkyl group, C ２ to C ２００ heteroalkyl group, C ２ to C ２００ alkene group, C ２ to C ２００ heteroalkene group, C ２ to C ２００ alkyne group, C ２ to C ２００ heteroalkyne group, C ３ to C ２００ cyclic group, or C ２ to C ２００ heterocyclic group; R Ａ is a monovalent C １ ~C ６０ Hydrocarbon group; and The elastomer according to claim 1, wherein m is an integer from 2 to 10.

3. The activated polycarboxylic acid is the polycarboxylic acid of formula (III). 【Chemistry 20】 During the ceremony R ３ is C ２ ~C ２００ alkyl group, C ２ ~C ２００ Heteroalkyl groups, C ２ ~C ２００ Alkene group, C ２ ~C ２００ Heteroalkene group, C ２ ~C ２００ Alkyne group, C ２ ~C ２００ Heteralkyne group, C ３ ~C ２００ Cyclic group, or C ２ ~C ２００ Heterocyclic groups; and o is an integer from 2 to 10; The elastomer according to claim 1, which is prepared by reacting with an activator in-situ or out-of-situ.

4. The elastomer according to claim 3, wherein the activated polycarboxylic acid is prepared in situ.

5. The polycarboxylic acids of formula (III) are succinic acid, adipic acid, azelaic acid, sebacic acid, dodecanediic acid, hexadecanedioic acid, and C ２１ Dimer acid, C ３６ Dimer acid, C hydrogenate ３６ An elastomer according to claim 3 or 4, selected from the group consisting of dimer acid, aspartic acid, glutamic acid, tartaric acid, maleic acid, and combinations thereof.

6. Activated polycarboxylic acids are activators of formula (IV). 【Chemistry 21】 During the ceremony R ４ is C １ ~C ６０ Represents a linear or branched alkyl radical having atoms. The elastomer according to claim 1, which is prepared by reacting it on-site or off-site.

7. The elastomer according to claim 6, wherein the activator is selected from the group consisting of dimethyl dicarbonate, diethyl dicarbonate, dipropyl dicarbonate, di-tert-butyl dicarbonate, and combinations thereof.

8. At least one polyol is a compound of formula (II). 【Chemistry 22】 During the ceremony R ２ is C ２ ~C ２００ alkyl group, C ２ ~C ２００ Heteroalkyl groups, C ２ ~C ２００ Alkene group, C ２ ~C ２００ Heteroalkene group, C ２ ~C ２００ Alkyne group, C ２ ~C ２００ Heteralkyne group, C ３ ~C ２００ Cyclic group, or C ２ ~C ２００ heterocyclic groups; and n is an integer from 2 to 10. The elastomer according to any one of claims 1 to 7.

9. Polyols include glycerin, diglycerin, polyglycerin, sorbitol, castor oil, hydrogenated castor oil, sugar alcohols, monosaccharides, disaccharides, oligosaccharides, polysaccharides, tannins, gallic acid, gluconic acid, lactobionic acid, gluconolactone, ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,2-pentanediol, 1,3-pentanediol, 1,4-pentanediol, 1,5-pentanediol, 1,2-hexanediol, 1,5-hexanediol, 1,6-hexanediol, C ３６ Dimer ol, hydrogenated C ３６ An elastomer according to any one of claims 1 to 8, selected from the group consisting of dimer ols and combinations thereof.

10. The elastomer according to claim 6 or 7, wherein the molar ratio of the total carboxyl functional groups (-COOH) to the activator is approximately 1.5:1 to approximately 1:

10.

11. An elastomer according to any one of claims 1 to 10, wherein the molar ratio of the total carboxyl functional groups (-COOH) to the total hydroxyl functional groups (-OH) is approximately 1.5:1 to approximately 1:1.

5.

12. Elastomers are: (i) At least one polycarboxylic acid of formula (III) 【Chemistry 23】 During the ceremony R ３ is C ２ ~C ２００ alkyl group, C ２ ~C ２００ Heteroalkyl groups, C ２ ~C ２００ Alkene group, C ２ ~C ２００ Heteroalkene group, C ２ ~C ２００ Alkyne group, C ２ ~C ２００ Heteralkyne group, C ３ ~C ２００ Cyclic group, or C ２ ~C ２００ Heterocyclic groups; and o is an integer from 2 to 10; (ii) At least one activator of formula (IV) 【Chemistry 24】 During the ceremony R ４ is C １ ~C ６０ Represents a linear or branched alkyl radical having atoms; and (iii) At least one polyol of formula (II) 【Chemistry 25】 During the ceremony R ２ is C ２ to C ２００ alkyl group, C ２ to C ２００ heteroalkyl group, C ２ to C ２００ alkene group, C ２ to C ２００ heteroalkene group, C ２ to C ２００ alkyne group, C ２ to C ２００ heteroalkyne group, C ３ to C ２００ cyclic group, or C ２ to C ２００ heterocyclic group; and n is an integer from 2 to 10. An elastomer according to any one of claims 1 to 11, prepared by reacting the following:

13. (i) at least one activated polycarboxylic acid; and (ii) at least one polyol A method for preparing an elastomer, including reacting it with [a certain substance].

14. The method of claim 13, wherein the solvent is selected from the group consisting of bio-based or naturally occurring solvents, triglyceride solvents, monoester solvents, diester solvents, citrate ester solvents, ether solvents, carbonic acid solvents, hydrocarbon solvents, silicone solvents, and combinations thereof.

15. The solvent is: (a) Triglyceride solvent of formula (V) 【Chemistry 26】 During the ceremony R ５ , R ６ , and R ７ Each of them is independently C １ ~C ３５ alkyl group, C １ ~C ３５ Heteroalkyl groups, C ２ ~C ３５ Alkene group, or C ２ ~C ３５ Heteralkene group; or (b) Monoester solvent of formula (VI) 【Chemistry 27】 During the ceremony R ８ and R ９ Each of them is independently C １ ~C ３５ alkyl group, C １ ~C ３５ Heteroalkyl groups, C ２ ~C ３５ Alkene group, or C ２ ~C ３５ heteroalkene group The method according to claim 13 or 14.

16. The solvent is: (a) A triglyceride solvent selected from the group consisting of caprylic / capric acid triglycerides, triheptanoin, corn oil, soybean oil, olive oil, rapeseed oil, cottonseed oil, coconut oil, almond oil, argan oil, rosehip seed oil, black seed oil, grapeseed oil, avocado oil, apricot kernel oil, geranium oil, lavender oil, rosehip oil, macadamia nut oil, eucalyptus oil, sardine oil, herring oil, safflower oil, linseed oil, sunflower oil, olive oil, canola oil, sesame oil, cottonseed oil, palm oil, rapeseed oil, tung oil, fish oil, peanut oil, cuphea oil, milkweed oil, glasswort oil, whale oil, castor oil, and combinations thereof; or (b) Caprylic / Capric Triglyceride, Capric Triglyceride, Jojoba Oil, Jojoba Esters, Isopropyl Jojobate, Macadamia Nut Oil Ethyl, Isoamyl Laurate, Heptyl Undecylenate, Methylheptyl Isostearate, Isostearyl Isostearate, Glyceryl Ricinoleate, Isostearyl Palmitate, Myristyl Myristate, Octyldodecyl Myristate, Octyldodecyl Hydroxystearate, Butyl Myristate Coconut oil ethylhexyl acid, ethylhexyl palmitate, ethylhexyl stearate, butyl stearate, decyl oleate, isocetyl behenate, isocetyl myristate, isocetyl palmitate, isocetyl stearate, isodecyl oleate, isopropyl isostearate, isopropyl myristate, isopropyl palmitate, oleyl oleate, propylene glycol laurate, octyldodecyl erucate, alkyl C lactate １２ ~C １３ Alkyl lactate C １２ ~C １５ Isostearyl lactate, glycereth-5 lactate, lauryl lactate, myristyl lactate, oleyl lactate, laureth-2 benzoate, alkyl C benzoate １２ ~C １５ , benzoic acid C １２ ~C １５ Pareth-3, Dipropylene Glycol Benzoate, Isodecyl Salicylate, Alkyl C Salicylate １２ ~C １５ The method according to any one of claims 13 to 15, wherein the monoester solvent is selected from the group consisting of tridecyl salicylate, ethylhexyl isononanoate, cetyl ethylhexanoate, isononyl isononanoate, isodecyl ethylhexanoate, isodecyl isononanoate, tridecyl ethylhexanoate, isotridecyl isononanoate, isostearyl isononanoate, cetearyl isononanoate, laureth-2 ethylhexanoate, cetearyl ethylhexanoate, isodecyl neopentanoate, isostearyl neopentanoate, myristyl neopentanoate, isostearyl behenate, octyldodecyl neopentanoate, tridecyl neopentanoate, and combinations thereof.

17. The solvent is: (a) Diester solvent of formula (VII) 【Chemistry 28】 During the ceremony R １０ is C １ ~C ３５ alkyl group, C １ ~C ３５ Heteroalkyl groups, C ２ ~C ３５ Alkene group, or C ２ ~C ３５ Heteroalkene group; and R １１ and R １２ C is independent １ ~C ３５ alkyl group, C １ ~C ３５ Heteroalkyl groups, C ２ ~C ３５ Alkene group, or C ２ ~C ３５ heteroalkene group; or (b) Diester solvent of formula (VIII) 【Chemistry 29】 During the ceremony R １０ is C １ ~C ３５ alkyl group, C １ ~C ３５ Heteroalkyl groups, C ２ ~C ３５ Alkene group, or C ２ ~C ３５ Heteroalkene group; and R １１ and R １２ H and C are independent. １ ~C ３５ alkyl group, C １ ~C ３５ Heteroalkyl groups, C ２ ~C ３５ Alkene group, or C ２ ~C ３５ heteroalkene group; or (c) Diester solvent of formula (IX) 【Transformation 30】 During the ceremony R １０ is C １ ~C ３５ alkyl group, C １ ~C ３５ Heteroalkyl groups, C ２ ~C ３５ Alkene group, or C ２ ~C ３５ Heteroalkene group; and R １１ and R １２ C is independent １ ~C ３５ alkyl group, C １ ~C ３５ Heteroalkyl groups, C ２ ~C ３５ Alkene group, or C ２ ~C ３５ heteroalkene group The method according to claim 13 or 14.

18. The solvents are diethyl succinate, dibutyl succinate, diethylhexyl succinate, diisopropyl sebacate, dimethyl sebacate, diethyl sebacate, dibutyl sebacate, diisostearyl dimer, diisostearyl malate, isostearyl stearoyl stearate, isocetyl stearoyl stearate, octyldodecyl stearoyl stearate, diethylhexyl malate, diethylhexyl maleate, dipropylene glycol dibenzoate, dicapryl adipate, dicaprylyl maleate, diisopropyl dimer, The method according to any one of claims 13, 14, or 17, wherein the diester solvent is selected from the group consisting of diisopropyl adipate, diisobutyl adipate, diisopropyl sebacate, diisostearyl dimer, diethylhexyl succinate, diethylene glycol diethylhexanoate, neopentyl glycol dicaprate, propylene glycol dicaprylate / caprate, neopentyl glycol diisostearate, neopentyl glycol diethylhexanoate, neopentyl glycol diheptanoate, and combinations thereof.

19. The solvent is: (a) Citrate ester solvent of formula (X) 【Chemistry 31】 During the ceremony R １３ , R １４ , R １５ , and R １６ H and C are independent. １ ~C ３５ alkyl group, C １ ~C ３５ Heteroalkyl groups, C ２ ~C ３５ Alkene group, or C ２ ~C ３５ heteroalkene group; or (b) Ether solvent of formula (XI) 【Chemistry 32】 During the ceremony R １７ and R １８ C is independent ２ ~C ２０ alkyl group, C ２ ~C ２０ Heteroalkyl groups, C ２ ~C ２０ Alkene group, or C ２ ~C ２０ Heteralkene group; or (c) Carbonate solvent of formula (XII) 【Transformation 33】 During the ceremony R １９ and R ２０ C is independent ２ ~C ２０ alkyl group, C ２ ~C ２０ Heteroalkyl groups, C ２ ~C ２０ Alkene group, or C ２ ~C ２０ heteroalkene group The method according to claim 13 or 14.

20. The solvent is: (a) Citrate ester solvents selected from the group consisting of tricaprylyl citrate, triisostearyl citrate, triisocetyl citrate, trioctyldodecyl citrate, triethyl citrate, tributyl citrate, acetyltriethyl citrate, acetyltributyl citrate, trioctyldodecyl citrate, triisocetyl citrate, and combinations thereof; or (b) an ether solvent selected from the group consisting of dicaprylyl ether, didecyl ether, panthenyl ethyl ether, dicetyl ether, dimyristyl ether, distearyl ether, distearyl ether, dilauryl ether, and combinations thereof; or (c) A carbonate solvent selected from the group consisting of dicaprylyl carbonate, diethylhexyl carbonate, and combinations thereof. The method according to any one of claims 13, 14, or 19.

21. The solvent has a number of carbon atoms C ４ From C ６０ The method of claim 13 or 14, wherein the hydrocarbon is...

22. The solvent is: (a) Farnesene, Hydrogenated Farnesene, Palm Alkanes, Palm / Palm Kernel Alkanes, C ９ ~C １２ Alkane, C １０ ~C １３ Alkane, C １２ ~C １７ Alkane, C １３ ~C １４ Alkane, C １３ ~C １５ Alkane, C １４ ~C １７ Alkane, C １４ ~C １９ Alkane, C １４ ~C ２０ Alkane, C １４ ~C ２２ Alkane, C １５ ~C １９ Alkane, C ２１ ~C ２８ Alkane, C １７ ~C ２３ Alkane, C ９ ~C １２ Isoalkanes, C ９ ~C １３ Isoalkanes, C ９ ~C １４ Isoalkanes, C ９ ~C １６ Isoalkanes, C １０ ~C １１ Isoalkanes, C １０ ~C １２ Isoalkanes, C １０ ~C １３ Isoalkanes, C １１ ~C １２ Isoalkanes, C １１ ~C １３ Isoalkanes, C １１ ~C １４ Isoalkanes, C １２ ~C １４ Isoalkanes, C １２ ~C １５ Isoalkanes, C １２ ~C ２０ Isoalkanes, C １３ ~C １４ Isoalkanes, C １３ ~C １６ Isoalkanes, C １４ ~C １６ Isoalkanes, C １５ ~C １９ Isoalkanes, C １０ ~C １６ Olefin, C １２ ~C １８ Olefin, C １８ ~C ２６ Olefin, C ２０ Olefin, C ２０ ~C ２４ Olefin, C ２４ ~C ３０ Olefin, C ２６ ~C ２８ Olefin, C ２６ ~C ５４ Olefin, C ２８ ~C ３６ Olefin, C ２８ ~C ５２ Olefin, C ３０ ~C ３８ Olefin, C ３０ ~C ４５ Olefin, C ４ ~C １２ Olefin, C ４ ~C ６ Olefin, C ５ ~C ６ Olefins, hydrogenated poly(C) ６ / C １０ / C １４ Olefins), hydrogenated poly(C ６ ~C １２ Olefins), hydrogenated poly(C ６ ~C １４ Olefins), hydrogenated poly(C ６ ~C ２０ Olefins), hydrogenated poly(C ８ / C １２ Olefin), poly(C ２０ ~C ２８ Olefin), poly(C ３０ ~C ４５ Olefin), poly(C ４ ~C １２ Olefin), poly(C ６ ~C １４ Olefins), hexadecene, C ３２ Alkane, C ３２ Isoalkanes, C ５４ Alkane, C ５４ Hydrocarbon solvents selected from the group consisting of isoalkanes, diethylhexylcyclohexane, undecane, tridecane, tetradecane, pentadecane, hexadecane, octadecane, docosane, squalane, hydrogenated polyisobutene, polybutene, hydrogenated polydecene, hydrogenated didecene, mineral oil, liquidum, petrolatum, dodecane, isohexadecane, isododecane, isoeicosane, and combinations thereof; or (b) Silicone solvent selected from the group consisting of dimethicone, phenyl dimethicone, caprylyl methicone, ethyl trisiloxane, cyclotetrasiloxane, cyclopentasiloxane, cyclohexasiloxane, and combinations thereof. The method according to claim 13 or 14.

23. A gel or paste prepared by contacting an elastomer according to any one of claims 1 to 12 with one or more solvents.

24. A powder or film prepared from an elastomer according to any one of claims 1 to 12.

25. A personal care formulation comprising the gel or paste of claim 23 or the powder or film of claim 24, selected from the group consisting of deodorants, antiperspirants, skin creams, facial creams, hair shampoos, hair conditioners, mousses, hair styling gels, hair sprays, protective creams, lipsticks, facial foundations, blushes, makeup, mascaras, skincare lotions, moisturizers, facial treatments, personal cleansers, facial washes, bath oils, perfumes, shaving creams, pre-shave lotions, after-shave lotions, colognes, sachets, sunscreen formulations, or combinations thereof.

26. Method: (iii) A swollen crosslinked polymer structure is formed by combining the crosslinked polymer structure with a second solvent; and (iv) A uniform polyester elastomer gel is formed by applying shear force to the swollen crosslinked polymer structure. A method according to any one of claims 13 to 22, further comprising:

27. Use of the gel or paste of claim 23 or the powder or film of claim 24 in the manufacture of a personal care formulation.

28. A method for preparing an elastomer, comprising: (a) (i) at least one activated polycarboxylic acid; and (ii) at least one polyol; reacted in the absence of a solvent in the first reaction step; and (b) Continue the reaction in the presence of at least one solvent in the second reaction step. A method that includes the act of doing so.

29. The method of claim 28, wherein the reaction in (a) is for a duration of at least 2 hours.

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