Aqueous dispersions of cross-linked polymer microparticles
First Claim
1. An aqueous coating dispersion of cross-linked polymer microparticles, said polymer microparticles being prepared at an elevated temperature in an aqueous medium from two components, (A) and (B), the ratio by weight of component (A) to component (B) being between 30:
- 70 and 95;
5, whereinA. component (A) is a polymer, optionally dissolved in an organic solvent, said polymer bearing at least two hydroxyl groups and comprising a number of ionic groups sufficient for the formation of a stable aqueous dispersion, said polymer comprising a polyesterpolyol having an acid value between 20 and 50, said polyesterpolyol being prepared from one or more polyol(s) selected from the group consisting of;
ethylene glycol, 1,2- and 1,3-propanediol, 1,3- and 1,4-butanediol, the isomeric pentanediols, hexanediols or octanediols (e.g., 2-ethyl-1,3-hexanediol), trimethylolpropane, neopentyl glycol, glycerol, bishydroxymethyl cyclohexane, erythritol, mesoerythritol, arabitol, adonitol, xylitol, mannitol, sorbitol, dulcitol, hexanetriol, and (poly-)pentaerythritol, by reaction with one or more polycarboxylic acid or anhydrides thereof--so far as said anhydrides exist--having from 2-18 carbon atoms, wherein said polycarboxylic acids and/or anhydrides may be employed individually or in admixtures thereof; and
component (B) is an aminoplast resin consisting of molecules containing at least two reactive groups consisting of hydroxyl and/or amino an/or ether groups;
the aqueous dispersion of cross-linked microparticles being stable.
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Abstract
The invention relates to aqueous dispersions of cross-linked polymer microparticles, prepared in an aqueous medium from a polymer, optionally dissolved in an organic solvent, said polymer bearing at least two hydroxyl groups and comprising a number of ionic groups sufficient for the formation of a stable aqueous dispersion, as the component (A) and one further component (B) at an elevated temperature, characterized in that component (A) is a polyesterpolyol, a polyurethane or a polyacrylate having an acid value of from 5 to 168, and that component (B) is an aminoplast resin consisting of molecules containing at least two reactive groups consisting of hydroxyl and/or amino and/or ether groups, that the ratio by weight of component (A) to component (B) is between 30:70 and 95:5, and that the dispersion is stable and usable in water and/or an organic solvent or mixtures thereof. The invention further relates to a process for producing these dispersions, the use thereof and coating compositions containing said dispersions.
26 Citations
13 Claims
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1. An aqueous coating dispersion of cross-linked polymer microparticles, said polymer microparticles being prepared at an elevated temperature in an aqueous medium from two components, (A) and (B), the ratio by weight of component (A) to component (B) being between 30:
- 70 and 95;
5, whereinA. component (A) is a polymer, optionally dissolved in an organic solvent, said polymer bearing at least two hydroxyl groups and comprising a number of ionic groups sufficient for the formation of a stable aqueous dispersion, said polymer comprising a polyesterpolyol having an acid value between 20 and 50, said polyesterpolyol being prepared from one or more polyol(s) selected from the group consisting of;
ethylene glycol, 1,2- and 1,3-propanediol, 1,3- and 1,4-butanediol, the isomeric pentanediols, hexanediols or octanediols (e.g., 2-ethyl-1,3-hexanediol), trimethylolpropane, neopentyl glycol, glycerol, bishydroxymethyl cyclohexane, erythritol, mesoerythritol, arabitol, adonitol, xylitol, mannitol, sorbitol, dulcitol, hexanetriol, and (poly-)pentaerythritol, by reaction with one or more polycarboxylic acid or anhydrides thereof--so far as said anhydrides exist--having from 2-18 carbon atoms, wherein said polycarboxylic acids and/or anhydrides may be employed individually or in admixtures thereof; andcomponent (B) is an aminoplast resin consisting of molecules containing at least two reactive groups consisting of hydroxyl and/or amino an/or ether groups; the aqueous dispersion of cross-linked microparticles being stable. - View Dependent Claims (2, 3, 4, 5, 13)
- 70 and 95;
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6. A process for producing an aqueous coating dispersion of cross-linked polymer microparticles, said process comprising reacting two components, component (A) and component (B) by:
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(a) adding component (B) into a solution of component (A) in an organic solvent or solvent mixture, the ratio by weight of component (A) to component (B) being between 30;
70 and 95;
5;(b) at least partially, neutralizing the mixture; (c) heating the mixture in an aqueous medium wherein 1. component (a) is a polymer optionally dissolved in an organic solvent, said polymer bearing at least two hydroxyl groups and comprising a number of ionic groups sufficient for the formation of a stable aqueous dispersion, said polymer comprising a polyesterpolyol having an acid value between 20 and 50, said polyesterpolyol being prepared from one or more polyol(s) selected from the group consisting of;
ethylene glycol, 1,2- and 1,3-propanediol, 1,3- and 1,4-butanediol, the isomeric pentanediols, hexanediols or octanediols (e.g., 2-ethyl-1, 3-hexanediol), trimethylolpropane, neopentyl glycol, glycerol, bishydroxymethyl cyclohexane, erythritol, mesoerythritol, arabitol, adonitol, xylitol, mannitol, sorbitol, dulcitol, hexanetriol, and (poly-)pentaerythritol, by reaction with polycarboxylic acid or anhydrides thereof--so far as said anhydrides exist--having from 2-18 carbon atoms, wherein said polycarboxylic acids and/or anhydrides may be employed individually or in admixtures thereof; and2. component (B) is an aminoplast resin consisting of molecules containing at least two reactive groups consisting of hydroxyl and/or amino and/or ether groups; (d) obtaining a stable aqueous dispersion of cross-linked microparticles. - View Dependent Claims (7, 8, 9, 10)
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11. A coating composition consisting of a dispersion of cross-linked polymer microparticles, said polymer microparticles being prepared at an elevated temperature in an aqueous medium from two components, (A) and (B), the ratio by weight of component (A) to component (B) being between 30:
- 70 and 95;
5, said medium optionally containing still further film-forming material, pigments and further conventional additives, and being particularly suitable for producing protective and/or decorative coatings, whereinA. component (A) is a polymer, optionally dissolved in an organic solvent, said polymer bearing at least two hydroxyl groups and comprising a number of ionic groups sufficient for the formation of a stable aqueous dispersion, said polymer comprising a polyesterpolyol having an acid value between 20 and 50, said polyesterpolyol being prepared from one or more polyol(s) selected from the group consisting of;
ethylene glycol, 1,2- and 1,3-propanediol, 1,3- and 1,4-butanediol, the isomeric pentanediols, hexanediols or octanediols (e.g., 2-ethyl-1,3hexanediol), trimethylolpropane, neopentyl glycol, glycerol, bishydroxymethyl cyclohexane, erythritol, mesoerythritol, arabitol, adonitol, xylitol, mannitol, sorbitol, dulcitol, hexanetriol, and (poly-)pentaerythritol, by reaction with polycarboxylic acid or anhydrides thereof--so far as said anhydrides exist--having from 2-18 carbon atoms, wherein said polycarboxylic acids and/or anhydrides thereof may be employed individually or in admixtures thereof; and
component (B) is an aminoplast resin consisting of molecules containing at least two reactive groups consisting of hydroxyl and/or amino and/or ether groups,the aqueous dispersion of cross-linked microparticles being stable. - View Dependent Claims (12)
- 70 and 95;
Specification