Aqueous coating composition containing aminosiloxane ester copolymer, process for the preparation of the aqueous coating composition and use for treating leather

Abstract

An aqueous coating composition comprising an aminosiloxane ester copolymer, an acrylic or polyurethane polymer, a surfactant, and water. The aqueous coating composition can be prepared by mixing an aqueous emulsion comprising an aminosiloxane copolymer, a surfactant, and water with an aqueous organic binder or dispersion. The aqueous coating composition can be used for leather treatment. The aqueous coating composition can be applied to a leather substrate and dried to remove water, thereby providing a coating on the leather substrate having a low coefficient of friction.

Description

Cross-reference to related applications

[0001] This application claims the benefit of U.S. Provisional Patent Application Serial No. 63 / 599,577, filed November 16, 2023, pursuant to 35 USC §119(e). U.S. Provisional Patent Application Serial No. 63 / 599,577 is hereby incorporated by reference. Technical Field

[0002] A water-based coating composition, a method for preparing the same, and its use in treating leather are provided. More specifically, the water-based coating composition comprises an aminosiloxane ester copolymer and an organic polymer binder. Background Technology

[0003] Leather is typically finished with one or more coatings to improve its overall properties, such as abrasion resistance and flexibility. The most common of these coatings are dispersions of polyurethane. Representative examples are described in the following: U.S. Patents 3,930,921, 6,353,051, 6,794,445, 8,591,999, 9,200,404, and 10,100,377; and U.S. Patent Application Publications 2005 / 0222368 and 2010 / 0310882. Silicones are typically included in coating compositions to improve one or more of tactile properties (“feel”), appearance, water resistance, abrasion resistance, and breathability, as described in U.S. Patent 11,518,905. Representative silicone additives are commercially available as formulated blends, dispersions, suspensions, emulsions, and fluids. Commercial examples include DOWSIL. ™ FBL-3289 and DOWSIL ™ 5-7299 dispersion (both are high molecular weight organosilicon systems dispersed in water) and XIAMETER ™ OFX-0531 fluid (aminomethoxy-functionalized polydimethylsiloxane), all purchased from The Dow Chemical Company, Midland, Michigan, USA.

[0004] There is still a need for improved waterborne leather coating compositions that provide enhanced performance properties, including a low coefficient of friction. Summary of the Invention

[0005] The waterborne coating composition comprises (A) an aminosiloxane ester copolymer (polymer), (B) a polymer binder selected from the group consisting of polyurethane and acrylic polymers, (C) a surfactant, and (D) water. This waterborne coating composition can be prepared by a method comprising mixing a waterborne copolymer emulsion and a waterborne binder emulsion. This waterborne coating composition can be used to form a coating on substrates requiring a low coefficient of friction, such as leather substrates. Detailed Implementation

[0006] The waterborne coating composition described above comprises (A) an aminosiloxane ester copolymer, (B) a polymer binder selected from the group consisting of polyurethane and acrylic polymers, (C) a surfactant, and (D) water. The waterborne coating composition may optionally also comprise additional starting materials, which may be selected from the group consisting of: (E) biocides; (F) pH adjusters; (G) pigments; (H) thickeners, rheology modifiers, matting agents or matting powders (e.g., silica), defoamers, water-repellent additives, anti-blocking additives, abrasion-resistant additives, antioxidants, UV absorbers, light stabilizers, antistatic agents, preservatives (other than the biocides described above), plasticizers, flame retardants, wetting agents (other than the surfactants described above), opacifiers, extenders, plasticizers, and combinations of two or more of these.

[0007] (A) copolymer

[0008] The starting material (A) in the waterborne coating composition described above is an aminosiloxane ester copolymer. Aminosiloxane ester copolymers include those of formula (A1):

[0009]

[0010] in

[0011] Each R 1 For independently selected monovalent hydrocarbon groups of 1 to 12 carbon atoms,

[0012] Each R E Independently selectable from hydroxyl groups and the formula H2N-R A The group is composed of - amino functional groups.

[0013] Each R A Independently, a divalent hydrocarbon group consisting of 1 to 12 carbon atoms.

[0014] Each R 2 Independently selected from the group consisting of hydrogen and methyl groups,

[0015] Each R D For independently selected divalent hydrocarbon groups of 2 to 20 carbon atoms,

[0016] Each subscript 'a' independently has a value such that 0 ≤ a < 150; and

[0017] The subscript has a value such that 1 ≤ b ≤ 100.

[0018] For R 1Suitable monovalent hydrocarbon groups include alkyl, alkenyl, aryl, and combinations thereof (e.g., aralkyl and arylene). For example, suitable alkyl groups include methyl, ethyl, propyl (including isopropyl and n-propyl), butyl (including isobutyl, n-butyl, sec-butyl, and tert-butyl), pentyl (including straight-chain pentyl and / or cyclopentyl) and branched alkyl groups having 5 carbon atoms, hexyl (including straight-chain hexyl and / or cyclohexyl) and branched alkyl groups having 6 carbon atoms, octyl (including straight-chain octyl and / or cyclooctyl), branched alkyl groups having 8 carbon atoms, decyl (including straight-chain decyl and / or cyclodecyl) and branched alkyl groups having 10 carbon atoms, and dodecyl (including straight-chain dodecyl and / or cyclododecyl) and branched alkyl groups having 12 carbon atoms. Alternatively, for R... 1 The alkyl group may be selected from the group consisting of methyl and ethyl, and alternatively, methyl. Used for R 1 Suitable alkenyl groups include vinyl, allyl, and hexenyl; alternatively vinyl or allyl; and alternatively vinyl. For use in R 1 Suitable aryl groups may include cyclopentadienyl, phenyl, naphthyl, and anthraceneyl. For use in R 1 Suitable arylalkyl groups include tolyl, xylyl, benzyl, 1-phenylethyl, and 2-phenylethyl. Alternatively, for R 1 The aryl group can be phenyl. Aryl groups (such as benzyl, 1-phenylethyl, and 2-phenylethyl) and aryl groups (such as styryl) can also be used in R. 1 Alternatively, for each R... 1 The group consisting of methyl and phenyl groups is optional. Alternatively, each R 1 It can be methyl.

[0019] Each R E Independently selectable from hydroxyl groups and the formula H2N-R A The group consisting of - amino functional groups, of which R A It is a divalent hydrocarbon group. Alternatively, each R E It may be a hydroxyl group. Alternatively, each R... E It can be expressed as H2N-R A -Amino functional groups. Each R A A divalent hydrocarbon group consisting of 1 to 12 carbon atoms, optionally 2 to 12 carbon atoms, optionally 2 to 5 carbon atoms, or optionally 2 to 3 carbon atoms. Used for R A The divalent hydrocarbon group can be straight-chain, branched, or cyclic, or a combination thereof. Used for R A Suitable divalent hydrocarbon groups include alkylene groups, arylene groups, and combinations thereof (e.g., dialkylarylene groups). Examples of alkylene groups include ethylene, propyleneene, or butylene. For R AThe arylene group can be an arylene group such as a phenylene group. Alternatively, R A It can be a dialkylarylene group, such as:

[0020] or ,

[0021] Each subscript u is independently 1 to 6, or alternatively 1 to 2. Alternatively, each R... A It may be an alkylene group, such as ethylene, propylene, or butylene; alternatively, it may be ethylene.

[0022] Each R 2 Independently selected from the group consisting of hydrogen and methyl groups. Alternatively, each R 2 It can be hydrogen.

[0023] Each R D A divalent hydrocarbon group consisting of 2 to 20 carbon atoms, alternatively 2 to 12 carbon atoms, alternatively 3 to 12 carbon atoms, alternatively 4 to 12 carbon atoms, and alternatively 4 to 10 carbon atoms, chosen independently. Used for R D The divalent hydrocarbon group can be straight-chain, branched, cyclic, or a combination thereof. Used for R D Suitable divalent hydrocarbon groups include alkylene groups, arylene groups, and combinations thereof. Alternatively, each R D It may be an alkylene group, such as propylene, butylene, hexene, octene, decene, or dodecene; alternatively, each R D It can be butylene, hexylene, or decanene. Alternatively, R... D It can be a branched alkylene group. Used in R D The arylene group can be an arylene group such as a phenylene group. Alternatively, R D It can be a dialkylarylene group, such as:

[0024] or ,

[0025] Each subscript u is independently 1 to 6, or alternatively 1 to 2.

[0026] The subscript a has a value such that 0 ≤ a < 150. Alternatively, the subscript a can have values ​​from 2 to 150, from 14 to 145, from 14 to 143, from 42 to 145, from 42 to 143, from 82 to 145, from 82 to 143, and from 42 to 82.

[0027] The subscript b has a value such that 2 ≤ b ≤ 100. Alternatively, the subscript b can have values ​​from 2 to 20, from 2 to 10, and from 3 to 4.

[0028] The copolymer described above may have a number average molecular weight (Mn) of >1,000 g / mole to 250,000 g / mole as measured by GPC according to the test methods described below. Alternatively, the copolymer may have an Mn of 4,000 g / mole to 250,000 g / mole, or alternatively 4,000 g / mole to 100,000 g / mole as measured by GPC.

[0029] Alternatively, the copolymer may have a weight-average molecular weight (Mw) of 2,000 g / mol to 400,000 g / mol. Alternatively, Mw may be 10,000 g / mol to 390,000 g / mol; alternatively 12,000 g / mol to 200,000 g / mol; alternatively 15,000 g / mol to 185,000 g / mol; alternatively 19,000 g / mol to 175,000 g / mol; alternatively 20,000 g / mol to 100,000 g / mol; alternatively 21,000 g / mol to 400,000 g / mol. The copolymer can be prepared by known methods, and the copolymer can be delivered as an emulsion. The copolymer and emulsion can be prepared as described in PCT patent application publication WO2023 / 278918.

[0030] The emulsion may comprise: (I) a continuous liquid phase comprising water, and (II) a discontinuous phase dispersed in the continuous liquid phase, wherein the discontinuous phase comprises the aforementioned aminosiloxane ester copolymer. The amount of copolymer added to the emulsion may vary and is not limited. However, this amount is typically in the range of 1% to 70%, alternatively 2% to 60% by weight of copolymer / emulsion. Water (and additional starting materials, if present) may constitute the remainder of the emulsion up to 100%.

[0031] water

[0032] Water is generally unrestricted and can be used in net form (i.e., without any carrier medium / solvent) and / or pure form (i.e., free of or substantially free of minerals and / or other impurities). For example, water may be treated or untreated prior to the preparation of the emulsions described herein. Examples of processes that can be used to purify water include distillation, filtration, deionization, and combinations of two or more of these, such that water can be deionized, distilled, and / or filtered. Alternatively, water may be untreated (e.g., tap water, i.e., supplied by a municipal water supply or well water, used without further purification). Alternatively, water may be purified prior to its use in the preparation of the emulsion.

[0033] additional starting materials

[0034] The emulsion may also contain additional starting materials selected from the group consisting of surfactants, acid compounds, acid anhydrides, thickeners, stabilizers, preservatives, and combinations of two or more thereof.

[0035] The copolymers described above can be self-emulsifying (i.e., a single surfactant is optional). However, when used, the surfactant can be anionic, cationic, nonionic, or amphoteric, or a combination of two or more of these. The amount of surfactant can be 2% to 25%, alternatively 2% to 20%, based on the combined weight of all starting materials in the emulsion.

[0036] surfactant

[0037] Emulsions containing (A) aminosiloxane ester copolymers may also contain surfactants. Surfactants may be anionic, cationic, nonionic, amphoteric, or combinations thereof. Anionic surfactants may be selected from alkali metal sulfonyl succinates, sulfonated glycerol esters of fatty acids, salts of sulfonated monovalent alcohol esters, amides of aminosulfonic acids, sulfonated products of fatty acid nitriles, sulfonated aromatic hydrocarbons, condensation products of naphthalenesulfonic acid and formaldehyde, sodium octahydroanthracene sulfonate, sodium lauryl sulfate, alkali metal alkyl sulfates, alkyl ether sulfates having at least 8 carbon atoms, alkyl aryl ether sulfates, alkyl aryl sulfonates having at least 8 carbon atoms, alkylbenzene sulfonic acids, salts of alkylbenzene sulfonic acids, sulfates of polyoxyethylene alkyl ethers, amine salts or sodium or potassium salts of alkylnaphthalene sulfonic acids, and combinations thereof. Suitable anionic surfactants are commercially available from a variety of sources, including sodium lauryl sulfate, which may be traded under the name CALIMULSE. ™ SLS was obtained from Pilot. Other anionic surfactants commercially available from The Dow Chemical Company include alkyl diphenyl ether disulfonates, which can be traded under the name DOWFAX. ™ Obtain; dioctyl sulfosuccinate, which can be traded under the name TRITON™ GR obtained; phosphate ester, which can be traded under the name TRITON ™ H-55, H-65, QS-44, OR XQS-20 are available; sulfates and sulfonates are available under the trade name TRITON. ™ QS-15 and TRITON ™ XN-45S obtained.

[0038] Cationic surfactants can be selected from dodecylamine acetate, octadecylamine acetate, acetates of amines of tallow fatty acids, homologues of aromatic amines containing fatty acids, fatty amides derived from aliphatic diamines, fatty amides derived from aliphatic diamines, fatty amides derived from disubstituted amines, derivatives of ethylenediamine, quaternary ammonium compounds, salts of quaternary ammonium compounds, alkyltrimethylammonium hydroxide, dialkyldimethylammonium hydroxide, coconut oil, methyl polyoxyethylene coconut oil ammonium chloride, dipalmitoylethyl hydroxyethyl ammonium methyl sulfate, amide derivatives of amino alcohols, amine salts of long-chain fatty acids, and combinations thereof. Cationic surfactants are commercially available from various sources, including ARQUAD from Akzo Nobel. ™ Dialkylmethyl quaternary ammonium compounds (e.g., hexadecyltrimethylammonium chloride); ADOGEN from Evonik ™ Cationic surfactant; TOMAH from Tomah Products, Inc., Milton, Wisconsin, USA. ™ Cationic surfactants; and VARIQUAT from Sea-Land Chemical Company in Westlake, Ohio, USA. ™ Cationic surfactants.

[0039] Nonionic surfactants can be selected from alkylphenol alkoxylates, ethoxylated and propoxylated fatty alcohols, alkyl polyglucosides and hydroxyalkyl polyglucosides, sorbitol derivatives, N-alkyl glucamides, alkylene oxide block copolymers (such as block copolymers of ethylene oxide, propylene oxide and / or butane oxide), fatty alcohol polyethylene glycol ethers, polyhydroxy and polyalkoxy fatty acid derivatives, amine oxides, silicone polyethers, and various polymeric surfactants. Nonionic surfactants are commercially available; for example, alkylphenol alkoxylates can be traded under the name ECOSURF. ™ EH is obtained; secondary alcohol ethoxylates, nonylphenol ethoxylates, and ethylene oxide / propylene oxide copolymers can be traded under the name TERGITOL. ™ Commercially available; and specific alkoxylated compounds (such as amine ethoxylated compounds and octylphenol ethoxylated compounds) can be marketed under the trade name TRITON. ™All are obtained from The Dow Chemical Company. Alternatively, the nonionic surfactant may be, for example, tridecyl alcohol polyether-6 or tridecyl alcohol polyether-12, which may be traded under the name SYNPERONIC. ™ From Croda or Lutensol ™ Obtained from BASF. Alternatively, the nonionic surfactant may be, for example, fatty alcohol polyethylene glycol ethers, such as GENAPOL. ™ UD 050 and GENAPOL ™ UD110, they are available from Clariant in Frankfurt, Germany.

[0040] Alternatively, the nonionic surfactant may comprise or be a silicone polyether (SPE). The silicone polyether, as an emulsifier, may have a rake-like structure, wherein a polyoxyethylene or polyoxyethylene-polyoxypropylene copolymer unit is grafted onto the siloxane backbone, or the SPE may have an ABA block copolymer structure, wherein A represents the polyether moiety and B represents the ABA-structured siloxane moiety. Suitable silicone polyethers include DOWSIL from The Dow Chemical Company. ™ OFX-5329 fluid. Alternatively, the nonionic surfactant may be selected from polyoxyethylene-substituted silicones, silicone alkanolamides, silicone esters, and silicone glycosides. Such silicone-based surfactants are known in the art and have been described, for example, in U.S. Patent 4,122,029 to Gee et al., U.S. Patent 5,387,417 to Rentsch, and U.S. Patent 5,811,487 to Schulz et al.

[0041] Suitable amphoteric surfactants include betaines, such as alkyl (C12-14) betaines, cocoamidopropyl betaines, cocoamidopropyl dimethyl-hydroxysulfobetaines, dodecyl betaines, hexadecyl betaines, and tetradecyl betaines; sulfobetaines, such as cocoamidopropyl hydroxysulfobetaines; lecithin; hydrogenated lecithin; cocoamidodiacetate; cocoiminodipropionate; and dodecyliminodipropionate.

[0042] Alternatively, the surfactant in the aqueous copolymer emulsion may be a nonionic surfactant. Alternatively, the surfactant may be an organic surfactant. Alternatively, the surfactant may be both organic and nonionic.

[0043] Aqueous copolymer emulsions can be formed as water-in-oil emulsions (w / o) containing a water-in-oil surfactant (which can subsequently be reversed by adding more water). The water-in-oil surfactant can be nonionic and can be selected from polyoxyethylene-substituted silicones, silicone alkanolamides, silicone esters, and silicone glycosides as described above. Alternatively, when the emulsion is an oil-in-water (o / w) emulsion, it may include nonionic surfactants known in the art for preparing o / w emulsions. Suitable nonionic surfactants for this embodiment are exemplified by: polyoxyethylene alkyl ethers, polyoxyethylene alkylphenol ethers, polyoxyethylene lauryl ethers, polyoxyethylene dehydrated sorbitan monooleate, polyoxyethylene alkyl esters, polyoxyethylene dehydrated sorbitan alkyl esters, polyethylene glycol, polypropylene glycol, diethylene glycol, ethoxylated trimethylnonanol, and polyoxyethylene glycol-modified polysiloxane surfactants, as described above.

[0044] acid compound

[0045] Optionally, an acid compound may be added to the aqueous copolymer emulsion to adjust the pH. Suitable acids include acetic acid, formic acid, propionic acid, and combinations thereof. Suitable acids for pH adjustment are disclosed, for example, in U.S. Patent 6,180,117.

[0046] process for making an aqueous copolymer emulsion

[0047] Emulsions can be prepared using conventional equipment in batch, semi-continuous, or continuous methods. For example, mixing starting materials to form an emulsion can be performed using equipment such as: batch equipment with high shear and high-speed dispersers, including those manufactured by Charles Ross & Sons (NY) and Hockmeyer Equipment Corp. (NJ); and batch mixing equipment, such as those marketed under the trade name Speedmixer. ™ Those for sale; intermittent equipment with high shear force, including Banbury models (CW Brabender Instruments Inc., NJ) and Henschel models (Henschel mixersAmerica, Texas). Illustrative examples of continuous mixers / compounders include extruders such as single-screw, twin-screw, and multi-screw extruders; co-rotating extruders, such as those manufactured by Krupp Werner & Pfleiderer Corp. (Ramsey, NJ) and Leistritz (NJ); twin-screw counter-rotating extruders; two-stage extruders; twin-rotor continuous mixers; dynamic or static mixers; or combinations thereof.

[0048] The above-mentioned starting materials can be combined under any suitable conditions for forming the emulsion. For example, to simplify the mixing process and keep the emulsion viscosity low during treatment, any acid compound can be added at the end of the method (i.e., once the desired dilution level is reached).

[0049] The emulsion of the above-mentioned aminosiloxane copolymer can be sufficient to provide an amount of (A) aminosiloxane copolymer of 0.1% to 50%, alternatively 0.1% to 10%, alternatively 0.5% to 10%, and alternatively 1% to 5% by weight of all the starting materials in the aqueous coating composition described herein.

[0050] (B) binder

[0051] The starting material (B) in the aqueous coating compositions described herein is a polymer binder (dry polymer). The polymer binder may be (B1) a polyurethane or (B2) an acrylic polymer. The polyurethane may be delivered as an aqueous dispersion. The aqueous polyurethane dispersion used herein to prepare the aqueous coating compositions may be an externally stable polyurethane dispersion or an internally stable polyurethane dispersion. An "internally stable polyurethane dispersion" herein refers to a polyurethane dispersion stabilized by introducing ionic or nonionic hydrophilic side groups into polyurethane particles dispersed in a liquid medium. Examples of nonionic internally stable polyurethane dispersions are described in U.S. Patents 3,905,929 and 3,920,598. Ionic internally stable polyurethane dispersions are known and described in U.S. Patent 6,231,926. Typically, dihydroxyalkylcarboxylic acids, such as those described in U.S. Patent 3,412,054, are used to prepare anionic internally stable polyurethane dispersions. A commonly used monomer for preparing anionic internally stable polyurethane dispersions is dimethylolpropionic acid (DMPA).

[0052] Polyurethane can be prepared by polymerization of monomers selected from: polyisocyanates having two or more isocyanate functional groups and having 4 to 40 carbon atoms, polyols (such as diols), monomers having at least one isocyanate group or at least one isocyanate reactive group and additionally having at least one hydrophilic group or potentially hydrophilic group, and optionally one or more compounds having reactive groups comprising an alcohol hydroxyl group, a primary or secondary amino group or an isocyanate group.

[0053] Suitable polyisocyanates include conventional aliphatic, alicyclic, aryl-aliphatic, and aromatic isocyanates. Polyisocyanates may be selected from the group consisting of diphenylmethane diisocyanate (“MDI”), polymeric diphenylmethane diisocyanate (“pMDI”), toluene diisocyanate (“TDI”), hexamethylene diisocyanate (“HDI”), dicyclohexylmethane diisocyanate (“HMDI”), isophorone diisocyanate (“IPDI”), cyclohexyl diisocyanate (“CHDI”), naphthalene diisocyanate (“NDI”), phenyl diisocyanate (“PDI”), tetramethylene diisocyanate (“TMDI”), and combinations thereof. Polyisocyanates may have the formula OCN-R-NCO, where R is an alkyl, aryl, or aralkyl moiety. Alternatively, polyisocyanates may contain any number of carbon atoms as described above, and alternatively, 4 to 20 carbon atoms.

[0054] Specific examples of suitable polyisocyanates include: alkylene diisocyanates having 4 to 12 carbons in the alkylene group, such as 1,12-dodecane diisocyanate, 2-ethyl-1,4-tetramethylene diisocyanate, 2-methyl-1,5-pentamethylene diisocyanate, 1,4-tetramethylene diisocyanate, and preferably 1,6-hexamethylene diisocyanate; alicyclic diisocyanates, such as 1,3-cyclohexane diisocyanate and 1,4-cyclohexane diisocyanate, and any mixtures of these isomers; 1-isocyano-3,3,5-trimethyl-5-isocyanomethylcyclohexane, 2,4-hexahydrotoluene diisocyanate and 2,6-hexahydrotoluene diisocyanate, and mixtures of their corresponding isomers; 4,4'-bicyclo... Hexylmethane diisocyanate, 2,2'-dicyclohexylmethane diisocyanate, and 2,4'-dicyclohexylmethane diisocyanate, and mixtures of their corresponding isomers; and aromatic diisocyanates and polyisocyanates, such as 2,4-toluene diisocyanate and 2,6-toluene diisocyanate, and mixtures of their corresponding isomers; 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, and 2,2'-diphenylmethane diisocyanate, and mixtures of their corresponding isomers; mixtures of 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, and 2,2-diphenylmethane diisocyanate and polyphenylene polymethylene polyisocyanate; and mixtures of MDI and toluene diisocyanate (TDI). Alternatively, the polyisocyanate may contain IPDI. Alternatively, the polyurethane may be made from one or more diisocyanates (such as IPDI or TMDI) and one or more polyols (such as polyether polyols, polycarbonate polyols, or polyester polyols, for example having a molecular weight (Mw) of 5,000 or less, or 2,000 or less). Such polyols may be linear and may have two hydroxyl groups, one at each end.

[0055] Suitable polyols include polyester polyols that react with the aforementioned isocyanates, including but not limited to the hydroxyl-functionalized reaction products of polyols with polycarboxylic acids, such as ethylene glycol, propylene glycol, diethylene glycol, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, cyclohexanediol, glycerol, trimethylolpropane, pentaerythritol, sucrose, or polyether polyols or mixtures thereof, and the polycarboxylic acid, particularly dicarboxylic acids or their esterified derivatives, such as succinic acid, glutaric acid, and adipic acid or their dimethyl esters, sebacic acid, phthalic anhydride, tetrachlorophthalic anhydride, dimethyl terephthalate, or mixtures thereof. Polyester polyols obtained by polymerization of lactones (e.g., caprolactone) with polyols or by polymerization of hydroxycarboxylic acids (e.g., hydroxyhexanoic acid) may also be used. In some embodiments, the polyol comprises a mixture of polyester and polyether polyols.

[0056] The term "externally stabilized polyurethane dispersion" as used herein refers to a polyurethane dispersion that does not have ionic or nonionic hydrophilic side groups and therefore requires the addition of a surfactant to stabilize the polyurethane dispersion. The surfactant may be one of those surfactants described in the copolymer emulsions described above. Examples of externally stabilized polyurethane dispersions are described in U.S. Patents 2,968,575; 5,539,021; 5,688,842 and 5,959,027.

[0057] Alternatively, the polyurethane dispersion may be an internally stabilized polyurethane dispersion. Alternatively, the polyurethane dispersion may comprise an aqueous polyurethane dispersion based on isophorone diisocyanate and polyester polyol, stabilized by carboxylic acid ester groups in the polyurethane backbone. The polyurethane may have a glass transition temperature of -44°C. Suitable polyurethane dispersions for preparing aqueous coating compositions are known in the art and are commercially available, such as BAYDERM. ™ Polyurethane dispersions, such as BAYDERM, are available from The Dow Chemical Company in Midland, Michigan, USA. ™ 91UD. Alternatively, the polyurethane dispersion may be as described in U.S. Patent 11,518,905 to Lenoble et al.

[0058] Other representative examples of applicable commercial polyurethane dispersions include: PERMUTEX from Stahl Polymer. ™ HAUTHANE from CL Hauthaway & Sons Corp. ™ L-3121 and PRIMAL obtained from The Dow Chemical Company ™BINDER and polyurethanes from Ableridingk Boley, Inc. Other polyurethane dispersions can be prepared by conventional methods in the art. See, for example, the methods described in P. Pieterich, Aqueous Emulsion, Dispersion and Solutions of Polyurethanes; Synthesis and Properties in Progress in Organic Coatings 9 (1981) 281-340. See also: US7232859, US2004 / 0167252 and US2011 / 0112245. These polyurethanes are typically prepared by reacting an organic polyisocyanate with an organic compound containing isocyanate reactive groups, specifically a polyol. The reaction can be carried out in the presence of a catalyst such as an organotin compound and / or a tertiary amine. Polyurethanes are conventionally prepared as aqueous dispersions and can be anionic salt functionalized, nonionic, or anionic polyurethane dispersions. In one embodiment, the polyurethane dispersion may be an anionic polyurethane dispersion, prepared by reacting one or more polyols with an organic compound having at least one acid group and at least two active hydrogen functional groups and a polyisocyanate. Suitable organic compounds having at least one acid group and at least two active hydrogen functional groups include, for example, 2,2-dimethylolacetic acid and 2,2-dimethylolpropionic acid. Examples of suitable acid groups for organic compounds include carboxylic acids, sulfonic acids, phosphoric acids, phosphonic acids, etc.

[0059] Alternatively, the waterborne coating composition may include (B2) an acrylic polymer as (B) a polymer binder. This acrylic polymer may be a copolymer comprising at least one copolymerized olefinically unsaturated monomer and 0.4% to 10%, alternatively 0.4% to 4% of a copolymerized acetoacetate or acetoacetamide monomer, where % is relative to the total weight of the monomers. Suitable olefinically unsaturated monomers include, for example, (meth)acrylate monomers, including methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, decyl acrylate, lauryl acrylate, methyl methacrylate, butyl methacrylate, isodecyl methacrylate, lauryl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, aminoalkyl (meth)acrylate; styrene or substituted styrene; butadiene; vinyl acetate or other vinyl esters; vinyl monomers, such as vinyl chloride, vinylidene chloride, N-vinylpyrrolidone; and acrylonitrile or methacrylonitrile. Alternatively, the copolymer monomers may be free of one or more functional groups, such as aldehydes and amines, capable of chemically reacting with acetoacetate or acetamide groups. Alternatively, the acrylic polymer may contain 25% to 65% copolyethyl acrylate based on the weight of the acrylic polymer.

[0060] The acrylic polymers used herein can be obtained in the form of aqueous emulsions. Acrylic polymer emulsions may have a solids content of 25% to 40%, or alternatively 30 wt% to 35 wt%. In addition to the acrylic polymers described above, the aqueous emulsions of acrylic polymers also contain water and a surfactant as described above for emulsions used with respect to copolymers for starting material (A). Suitable commercially available acrylic polymer emulsions that can be used in this invention may include, for example, HYDRHOLAC available from The Dow Chemical Company. ™ Cl-1 emulsion (HYDRHOLAC is a trademark of ROHMand HAAS Company).

[0061] The emulsion or dispersion of the polymeric adhesive described above may be sufficient to provide 15% to 70%, alternatively 30% to 70%, alternatively 30% to 60%, alternatively 30% to 40%, and alternatively 40% to 60% of the combined weight of all starting materials in the aqueous coating composition described herein, in an amount of (B) polymeric adhesive.

[0062] (C) surfactant

[0063] The starting material (C) in the waterborne coating composition is a surfactant. The surfactant may be introduced into the waterborne coating composition together with the starting material (A) aminosiloxane ester copolymer and (B) polymer binder, both of which may be delivered as an aqueous emulsion or dispersion as described above, and / or the surfactant may be added alone or both. Alternatively, the surfactant in the waterborne coating composition may comprise an organic surfactant. Alternatively, the surfactant in the waterborne coating composition may be a nonionic surfactant. Alternatively, the surfactant in the waterborne coating composition may be an organic nonionic surfactant. The organic nonionic surfactant may have a relatively high hydrophobic-oleophobic balance (HLB) value. For example, organic nonionic surfactants are as described above in aqueous copolymer emulsions for the starting material (A) aminosiloxane ester copolymer, and include those commercially available surfactants, such as (i) those under the name TERGITOL. ™ TMN-6 and TERGITOL ™ TMN-10 sells 2,6,8-trimethyl-4-nonoxyethylene glycol (6EO) and (10EO); (ii)C 11-15 Secondary alkyl polyoxyethylene ethers (e.g., under the name TERGITOL) ™ 15-S-7, TERGITOL ™ 15-S-9 and TERGITOL ™C 15-S-15 (HL value 15.4) for sale 11-15 Secondary alcohol ethoxylates (7EO, 9EO, and 15EO) are marketed under the trade name ECOSURF by The Dow Chemical Company of Midland, Michigan, USA. ™ EH-40 and TERGITOL ™ 15-S-12, TERGITOL ™ 15-S-30 and TERGITOL ™ Other C sold under 15-S-40 11-15 Secondary alcohol ethoxylates; marketed by The Dow Chemical Company under the name TRITON ™ (iii) Octylphenyl polyoxyethylene (40) ether sold by X405; and (iii) MAKON by Stepan Company under the name MAKON. ™ (iv) Nonylphenyl polyoxyethylene (10) ether sold by Henkel Corp. / Emery Group of Cincinnati, Ohio, USA, under the name Trycol 5953; (v) Croda Inc. of Edison, New Jersey, USA, under the name BRIJ ™ L23 (HLB value 16.9) and BRIJ ™ Ethoxylated alcohols sold under the L4 (HLB value 9.7), (vi) under the trademark BRIJ ™ 23 commercially available polyoxyethylene 23 lauryl ether (Laureth-23); and RENEX ™ 30, a polyoxyethylene ether alcohol; (vii) alkyl-oxo alcohol polyethylene glycol ether, such as GENAPOL ™ UD 050 (HLB value 11.4) and GENAPOL ™ UD110 (HLB value 14.4), (viii) alkyl polyethylene glycol ethers based on C10-Gelbert alcohol and ethylene oxide, such as LUTENSOL ™ XP 79, and (ix) alkyl polyglycosides, such as those produced by BASF under the trade name Glucopon ™ Those sold, as well as alkyl glucosides, such as those marketed under the trade name EcoSense by The Dow Chemical Company of Midland, Michigan, USA. ™ Decyl glucoside, lauryl glucoside, and cocoyl glucoside are available for sale. Other commercially available nonionic surfactants include TERGITOL, also from The Dow Chemical Company. ™15-S-5, with an HLB value of 10.5; Lutensol XP 50 (HLB value 10), Lutensol XP 79 (alcohol ethoxylate), Lutensol XP 100 (alcohol ethoxylate), and Lutensol XP 140 (HLB value 16), each available from BASF. Based on the combined weight of all starting materials in the waterborne coating compositions described herein, the amount of surfactant in the waterborne coating compositions may be, for example, from 0.03% to 25%, alternatively from 0.03% to 4%.

[0064] (D) water

[0065] The starting material (D) in the waterborne coating composition is water. All or part of the water may be introduced into the waterborne coating composition along with the starting material (A) aminosiloxane copolymer and (B) polymer binder, both typically delivered as an aqueous emulsion or dispersion as described above. There are no particular limitations on the water, and it may be as described above in an emulsion of the starting material (A) aminosiloxane copolymer. There are no particular limitations on the amount of water in the waterborne coating composition. Based on the combined weight of all the starting materials in the waterborne coating composition described herein, the amount of water may be >0% to 70%, alternatively >0% to 65%, or alternatively 40% to 70%.

[0066] One or more optional additional starting materials may be included in the waterborne coating composition, provided that they do not impair the properties of the waterborne coating composition and the performance of the coatings made from the composition. Suitable other optional starting materials include (E) biocides, (F) pH adjusters, (G) pigments, (H) thickeners, rheology modifiers, matting agents or matting powders (e.g., silica), defoamers, water-repellent additives, anti-blocking additives, abrasion-resistant additives, antioxidants, UV absorbers, light stabilizers, antistatic agents, preservatives (other than the biocides described above), plasticizers, flame retardants, wetting agents (other than the surfactants described above), opacifiers, extenders, plasticizers, and combinations of two or more of these.

[0067] (E) biocide

[0068] The starting material (E) is a biocide. Biocides are optional and may be added to the waterborne coating composition to ensure that the coating prepared from the waterborne coating composition provides protection against microbial attack during storage and transportation. Biocides are exemplified by fungicides, herbicides, insecticides, antimicrobials, or combinations thereof. Alternatively, the waterborne coating composition may contain fungicides, antimicrobials, or combinations thereof. The amount of biocide will depend on factors including the type of biocide selected and the desired beneficial effect. However, the amount of biocide can range from greater than 0% to 5%, alternatively from 1 ppm to 1500 ppm, each based on the weight of all starting materials in the waterborne coating composition. Biocides are known in the art and are commercially available. For example, PREVENTOL... ™ C40-L, the PREVENTOL ™ C40-L is a preservative based on p-chloro-m-cresol (PCMC); BIOBAN ™ O 45 antimicrobial agent; Preventol ™ BIT 20 N; Preventol ™ BM 5; Preventol ™ CMK 40; and Preventol ™ D7 is a biocidal agent suitable for leather treatment and is available from Lanxess in Pittsburgh, Pennsylvania, USA.

[0069] (F) pH adjuster

[0070] The starting material (F) is a pH adjuster. The pH adjuster is optional and can be added to alter the pH of the waterborne coating composition. It is not desirable to be bound by theory, but it is considered that the pH adjuster can be used to reduce the particle size of the waterborne coating composition (in emulsion form) compared to a composition without a pH adjuster. The pH adjuster can be an acid used as described above in waterborne copolymer emulsions to deliver (A) an aminosiloxane ester copolymer. Alternatively, the pH adjuster can be a buffer, such as sodium carbonate, sodium bicarbonate, and combinations thereof. The amount of pH adjuster depends on various factors, such as the type of rheology modifier present (if any); however, based on the combined weight of all starting materials in the waterborne coating composition, the amount of pH adjuster can be 0% to 5%, alternatively >0% to 5%.

[0071] (G) pigment

[0072] The starting material (G) is a pigment. Pigments are optional and can be added to the waterborne coating composition to impart the desired color to the coating prepared from the waterborne coating composition. Suitable pigments are known in the art and are commercially available. Pigments include carbon black and titanium dioxide. Based on the combined weight of all starting materials used to prepare the waterborne coating composition described herein, the amount of pigment may be ≥0%.

[0073] When selecting starting materials to prepare the above-described waterborne coating compositions, there may be overlap between the types, as some of the starting materials described herein may have more than one function. For example, some microparticles can be used as pigments and as flame retardants, such as carbon black. When additional starting materials are added to the waterborne coating compositions, these additional starting materials are different from each other and are different from the starting materials (A), (B), (C), and (D) described above. Examples of suitable additional starting materials and their amounts can be found, for example, in U.S. Patents 9,200,404, 10,100,377, and 1,151,8905.

[0074] The waterborne coating compositions described herein may be free of crosslinking agents. For the purposes of this application, "free of crosslinking agents" means that when the waterborne coating composition is used in a method of treating a substrate containing leather, the waterborne coating composition does not contain crosslinking agents, as described below, or the amount of crosslinking agent contained in the waterborne coating composition is insufficient to adversely affect the static and dynamic coefficients of friction of the coating prepared by drying the waterborne coating composition, as measured in the test methods described in the following examples.

[0075] process for making an aqueous coating composition

[0076] Waterborne coating compositions can be prepared using any convenient equipment and in any convenient manner. Waterborne coating compositions can be prepared by methods including:

[0077] 1) Mix the starting materials, said starting materials comprising

[0078] a) An aqueous copolymer emulsion, said aqueous copolymer emulsion comprising:

[0079] (I) A continuous liquid phase containing water, and

[0080] (II) A discontinuous phase dispersed in the continuous liquid phase, wherein the discontinuous phase comprises (A) an aminosiloxane ester copolymer.

[0081] The aqueous copolymer emulsion also contains surfactants and water;

[0082] b) An aqueous binder emulsion comprising (B) a polymer binder and water. The method may optionally further include one or more additional steps prior to step 1), such as dispersing the pigment-containing starting material in water prior to step 1) to prepare an aqueous pigment dispersion, and mixing the aqueous pigment dispersion with the starting material from step 1). The method may optionally further include one or more additional steps after step 1), such as removing agglomerated particles after step 1) and / or the method may further include 2) adding additional starting materials selected from the group consisting of: (E) biocides, (F) pH adjusters, (G) pigments, (H) thickeners, rheology modifiers, matting agents or matting powders (e.g., silica), defoamers, water-repellent additives, anti-blocking additives, abrasion-resistant additives, antioxidants, UV absorbers, light stabilizers, antistatic agents, preservatives (other than the biocides described above), plasticizers, flame retardants, wetting agents (other than the surfactants described above), opacifiers, extenders, plasticizers, and combinations of two or more of these. Furthermore, the method may optionally include adding additional water for dilution, for example for use at a remote location, to reduce the total solids of the waterborne coating composition to a desired range. Thus, the waterborne coating composition can be shipped in any stable, concentrated form.

[0083] The mixing of the starting materials in step 1) (and any optional additional steps) can be carried out in any convenient manner, such as optionally mixing under shear using the apparatus and method described above for preparing the emulsion of (A) aminosiloxane ester copolymer. Alternatively, simple mixing can be performed to mix the starting materials in step 1), for example without shearing. The aqueous coating composition prepared as described above can be used to treat substrates containing leather (as follows).

[0084] process for treating leather

[0085] The water-based coating composition prepared as described above can be used to treat substrates containing leather (i.e., natural or synthetic leather). For example, one method for treating a substrate includes:

[0086] i) Applying the above-described water-based coating composition to a substrate containing leather; and

[0087] ii) Drying the water-based coating composition to remove water, thereby forming a coating on the substrate. The water-based coating composition can be applied to the substrate by any convenient method. For example, the water-based coating composition can be applied to the substrate by methods selected from the group consisting of: spraying, scraping, rolling, casting, drum coating, dip coating, gravure coating, rod coating, screen coating, curtain coating, brush coating, and combinations thereof. There is no specific limitation on the amount of water-based coating composition applied to the substrate, and a wet coating thickness of 10 μm to 100 μm can be achieved, which corresponds to a dry coating thickness of 2 μm to 70 μm. Drying can be carried out by any convenient method, such as air drying or heat drying of the coated substrate. The conditions for heat drying depend on various factors, including the substrate selected. For example, when the substrate contains natural leather, the heat drying temperature can be ≤120°C. Alternatively, for synthetic leather substrates, the heat drying temperature can be ≤180°C, or alternatively ≤150°C, for a duration sufficient to remove most or all of the water. The method may optionally further include iii) repeating steps i) and ii) once or more to increase the thickness of the coating on the substrate. There is no particular limitation on the thickness of the coating formed on the substrate.

[0088] The water-based coating compositions and methods for treating substrates described herein can be used to provide coatings on leather, including natural and synthetic leather, such as for automotive and other motor vehicle applications (e.g., as coatings on armrests, dashboards, seats, and other interior components); clothing such as coats, trousers, flight jackets, motorcycle clothing, shoes, and gloves; luggage or handbags; accessories such as belts, wallets, and notebooks; furniture; or saddles for bicycles or motorcycles.

[0089] examples

[0090] The following embodiments are provided to illustrate the invention to those skilled in the art, and these embodiments should not be construed as limiting the scope of the invention as set forth in the claims. The starting materials used in these embodiments are described in Tables 1 and 2 below.

[0091] In this Reference Example 1, an aqueous copolymer emulsion having the amounts of starting materials shown in Table 1 below was prepared as described in PCT Patent Application Publication WO2023 / 278918. In a plastic dental cup, an aminosiloxane copolymer, a surfactant, and phase-inverting water were added and mixed for 30 seconds at 3500 rpm using a high-shear mixer (dental mixer). The resulting viscous phase was then diluted with water, and an acetic acid solution was added at the end of the process.

[0092] Table 1 - starting materials for aqueous copolymer emulsion

[0093]

[0094] In this Reference Example 2, an aqueous emulsion of a commercially available amino-functionalized polydiorganosiloxane was prepared using the amounts of starting materials shown in Table 2 below.

[0095] Table 2 - starting materials for comparative (aminosiloxane) emulsion

[0096]

[0097] In this Reference Example 3, an aqueous coating composition was prepared as follows: an aqueous emulsion and other starting materials, except for a thickener (if present), were stirred under low shear. The resulting mixture was then filtered to remove agglomerated particles. Finally, a thickener (if present) was added to the mixture. The starting materials in these coating compositions are described in Table 4, and the amounts of each starting material are shown in Table 5 for compositions with polyurethane binders and in Table 7 for acrylic polymer binders.

[0098] In Reference Example 4, a coating was prepared on a substrate using an aqueous coating composition and tested as follows: To form the aqueous coating composition of the present invention, the aqueous copolymer emulsion and water-based binder described in Reference Example 1 above were mixed together under low shear conditions using a laboratory mixer (IKA laboratory mixer, 500 rpm, 5 minutes). The resulting aqueous coating composition was applied to a sealed, opaque card (Type 2A, obtained from Leneta Company) using a 60µm cylindrical applicator from BYK. The card was black on the top and white on the bottom, with overall dimensions of 5 1 / 2 × 10 inches (140 x 254 mm). The coated card was then dried in a conventional oven at 80°C for 2 minutes.

[0099] The coefficient of friction for each coating was measured between the felt (spring) and the coated sample (support) using a Ziegler Instruments SSP-04 stick-slip tester with a normal force of F=2.0N, a displacement of 40mm, and a speed of v=6.0mm / s. The test was run for 10 cycles, and data analysis was performed using Ziegler Instruments software. The felt was sourced from Ideal Fellow in Brussels, model: Needle-Tex - IF-202-S1. Appearance was assessed by visual inspection.

[0100] Table 4 - starting materials for coating compositions prepared according to reference example 3

[0101]

[0102] Table 5 - aqueous coating compositions with polyurethane binder

[0103]

[0104] Note: In the examples reported in Table 5 (coatings), the emulsion was first diluted by adding water to obtain 28% active material (copolymer) (31.4g of water was added to 100g of emulsion).

[0105] Table 6 - test results for aqueous coating compositions with polyurethane binder

[0106]

[0107] The results in Table 6 show that, in coatings prepared with polyurethane binders, the addition of aminosiloxane copolymers (in coatings 5, 6, and 7) provides a benefit of reducing the static and dynamic coefficients of friction for all test conditions compared to coatings without aminosiloxane copolymers (i.e., coating 1). Furthermore, when the siloxane blocks have a DP of 44 or greater, or 84 or greater (i.e., coatings 6 and 7), the coatings containing aminosiloxane copolymers are superior to commercially available amino-functionalized siloxanes.

[0108] Table 7 - aqueous coating compositions with acrylic binder

[0109]

[0110] Note: In the examples reported in Table 7 (Coatings), the emulsion was first diluted with water to obtain 28% active substance (31.4g of water was added to 100g of emulsion).

[0111] Table 8 - test results for aqueous coating compositions with acrylic binder

[0112]

[0113] The results in Table 8 show that, in coatings prepared with acrylic binders, the addition of aminosiloxane copolymers (in coatings 8, 9, and 10) provides a benefit of reducing the static and dynamic coefficients of friction for all test conditions, compared to coatings without aminosiloxane copolymers (i.e., coating 2). Furthermore, when the siloxane blocks have a DP of 84 or greater (i.e., coating 7), coatings containing aminosiloxane copolymers outperform commercially available amino-functionalized siloxanes due to better appearance without sacrificing friction coefficient performance.

[0114] industrial applicability

[0115] Using aminosiloxane copolymers as additives at low loadings in waterborne coating compositions containing polyurethane or acrylic polymer binders provides beneficial properties in coatings prepared therefrom, such as low CoF. Not wishing to be bound by theory, it is believed that the use of aminosiloxane copolymers can further provide coatings with one or more of the following benefits: high contact angle with water, low stick-slip properties, and low leaching. To improve compatibility with binders, aminosiloxane copolymers can be delivered as emulsions using nonionic surfactants. Furthermore, aminosiloxane copolymers can provide one or more benefits superior to other active ingredients in silicone leather treatment compositions. For example, aminosiloxane copolymers have low cyclic polysiloxane content (<0.05% octamethylcyclotetrasiloxane), stability after aging (as demonstrated by the low cyclic content after aging), little or no crosslinking, and potential for biodegradability.

[0116] Without being bound by theory, it is believed that using copolymers in which the subscript a is at least 14, alternatively at least 42, alternatively 42 to 200, and alternatively 42 to 84 can provide improved static and / or dynamic coefficients of friction for coatings prepared as described herein, compared to coatings prepared from comparative compositions that do not contain aminosiloxane ester copolymers.

[0117] definitions and use of terms

[0118] Unless the context otherwise indicates, all quantities, ratios, and percentages herein are by weight. Unless the context otherwise indicates, the articles “an,” “a,” and “described” each refer to one (an) or more (a plurality of). Unless the context otherwise indicates, the singular form also includes the plural form. The summary of the invention and the abstract of the specification are incorporated herein by reference. The total amount of all starting materials in the composition is 100%. The transitional phrases “comprising,” “consistently consisting of,” and “composed of” are used as described in Chapters 2111.03 I, II, and III of the Patent Examining Procedure Ninth Edition, last revised January 2018, Amendment 08.2017. Any feature or aspect of the invention may be used in combination with any other feature or aspect described herein. The abbreviations used herein have their definitions in Table 9.

[0119] Table 9 - abbreviations

[0120]

Claims

1. A water-based coating composition, said water-based coating composition comprising: (A) An aminosiloxane ester copolymer, wherein the aminosiloxane ester copolymer has the following formula: in Each R 1 For independently selected monovalent hydrocarbon groups of 1 to 12 carbon atoms, Each R E Independently selectable from hydroxyl groups and the formula H2N-R A The group is composed of - amino functional groups. Each R A Independently, a divalent hydrocarbon group consisting of 1 to 12 carbon atoms. Each R 2 Independently selected from the group consisting of hydrogen and methyl groups, Each R D For independently selected divalent hydrocarbon groups of 2 to 20 carbon atoms, Each subscript 'a' independently has a value such that 0 ≤ a < 150, and The subscript has a value such that 1 ≤ b ≤ 100. (B) A polymeric adhesive, wherein the polymeric adhesive is selected from the group consisting of polyurethane and acrylic polymers. (C) Surfactants; and (D) Water.

2. The composition of claim 1, further comprising additional starting materials selected from the group consisting of: biocides; pH adjusters; pigments, thickeners, rheology modifiers, matting agents or matting powders, defoamers, water-repellent additives, anti-blocking additives, abrasion-resistant additives, antioxidants, UV absorbers, light stabilizers, antistatic agents, preservatives, plasticizers, flame retardants, wetting agents, opacifiers, extenders, plasticizers, and combinations of two or more of these.

3. The composition according to claim 1 or claim 2, wherein the composition does not contain a crosslinking agent.

4. The composition according to any one of claims 1 to 3, wherein the polymeric adhesive of (B) comprises polyurethane.

5. The composition according to claim 4, wherein the polyurethane is based on isophorone diisocyanate and polyester polyol, and is stabilized by carboxylic acid ester groups present in the polyurethane backbone.

6. The composition according to any one of claims 1 to 3, wherein the polymeric adhesive (B) comprises an acrylic polymer.

7. The composition according to claim 6, wherein the acrylic polymer has a glass transition temperature of -40°C.

8. The waterborne coating composition according to any one of claims 1 to 7, wherein the waterborne coating composition comprises: 0.1% to 50% by weight of the aminosiloxane copolymer of (A), 30% to 70% by weight of the polymer adhesive described in (B), 0.03% to 25% by weight of the surfactant described in (C), and >0% by weight to 70% by weight of the water (D).

9. The waterborne coating composition according to claim 8, wherein the waterborne coating composition further comprises: The biocide described in (E) is present in amounts ranging from 1 ppm to 1500 ppm by weight. >0% to 5% by weight of the pH adjuster (F), 0% to 5% by weight and >0% to 1% by weight of rheology modifiers.

10. A method for preparing the composition according to any one of claims 1 to 9, wherein the method comprises: 1) Mix the starting materials, said starting materials comprising a) An aqueous copolymer emulsion, said aqueous copolymer emulsion comprising: (I) A continuous liquid phase containing water, and (II) A discontinuous phase dispersed in the continuous liquid phase, wherein the discontinuous phase comprises (A) an aminosiloxane ester copolymer. The aqueous emulsion further comprises surfactants, water, biocides, and pH adjusters; b) An aqueous adhesive emulsion comprising the polymer adhesive and water.

11. The method of claim 10, wherein the method further comprises: Prior to step 1), the starting material containing pigment (G) is dispersed in water (D) to prepare an aqueous pigment dispersion. The aqueous pigment dispersion is mixed with the starting material from step 1).

12. The method according to claim 10 or claim 11, the method further comprising removing the aggregated particles after step 1).

13. The method according to any one of claims 10 to 12, further comprising: 2) Add additional starting materials selected from the following groups: biocides; pH adjuster; Pigments, thickeners, rheology modifiers, matting agents or matting powders, defoamers, water-repellent additives, anti-blocking additives, abrasion-resistant additives, antioxidants, UV absorbers, light stabilizers, antistatic agents, preservatives, plasticizers, flame retardants, wetting agents, opacifiers, bulking agents, plasticizers, and combinations of two or more of them.

14. A method for treating leather, wherein the method comprises: i) Applying the water-based coating composition according to any one of claims 1 to 9 to a substrate containing leather; as well as ii) Dry the water-based coating composition to form a coating on the substrate.

15. The method according to claim 14, further comprising: iii) Repeat steps i) and ii) once or more to increase the thickness of the coating.

Images