阅读说明：本技术 可交联水性涂料组合物 (Crosslinkable aqueous coating composition ) 是由 格拉达斯·可纳利斯·奥佛比克 阿尔佛雷德·吉恩·保罗·布克曼 帕特里克·约翰内斯·玛丽亚·斯托尔 于 2018-07-16 设计创作，主要内容包括：本发明涉及包含分散的羰基官能乙烯基聚合物颗粒的单包装水性涂料组合物,其特征在于该涂料组合物还包含碳二酰肼,其中(i)酰肼基与羰基的当量摩尔比为0.1至0.95,(ii)所述羰基官能乙烯基聚合物的数均分子量与所述羰基官能乙烯基聚合物的酸值之比大于400,并且(iii)所述羰基官能乙烯基聚合物的酸值为2至100mg KOH/克羰基官能乙烯基聚合物。(The present invention relates to a one-pack aqueous coating composition comprising dispersed particles of a carbonyl-functional vinyl polymer, characterized in that the coating composition further comprises a carbodihydrazide, wherein (i) the equivalent molar ratio of hydrazide groups to carbonyl groups is from 0.1 to 0.95, (ii) the ratio of the number average molecular weight of the carbonyl-functional vinyl polymer to the acid value of the carbonyl-functional vinyl polymer is more than 400, and (iii) the acid value of the carbonyl-functional vinyl polymer is from 2 to 100mg KOH/g of carbonyl-functional vinyl polymer.)

1. A one-pack aqueous coating composition comprising dispersed carbonyl-functional vinyl polymer particles, characterized in that the coating composition further comprises a carbodihydrazide, wherein

(i) The equivalent molar ratio of hydrazide groups to carbonyl groups is 0.1 to 0.95,

(ii) the ratio of the number average molecular weight of the carbonyl-functional vinyl polymer to the acid value of the carbonyl-functional vinyl polymer is greater than 400, and

(iii) the carbonyl-functional vinyl polymer has an acid value of 2 to 100mg KOH/gram of carbonyl-functional vinyl polymer.

2. The coating composition according to claim 1, wherein the equivalent molar ratio of hydrazide groups to carbonyl groups is from 0.2 to 0.95.

3. The coating composition of claim 1 or 2, wherein the ratio of the number average molecular weight of the carbonyl-functional vinyl polymer to the acid value of the carbonyl-functional vinyl polymer is greater than 600.

4. The coating composition according to any one of the preceding claims, wherein the coating composition comprises carbodihydrazide in an amount of less than 3 wt.% and greater than 0.5 wt.%, preferably in an amount of less than 1.5 wt.%, relative to the total amount of monomers added for preparing the carbonyl-functional vinyl polymer.

5. The coating composition according to any one of the preceding claims, wherein the redox potential of the colloidal aqueous dispersion of the carbonyl functional vinyl polymer (prior to the addition of the carbodihydrazide) is < +90mV, preferably < +50mV, more preferably < +10mV at pH 7.

6. The coating composition according to any one of the preceding claims, wherein the redox potential of the coating composition (after addition of the carbohydrazide) is < +32.5mV, preferably < +12.5mV, more preferably < +2.5mV at pH 7.

7. The coating composition of any one of the preceding claims, wherein the redox potential value of the colloidal aqueous dispersion of the carbonyl-functional vinyl polymer at pH y (before the addition of carbodihydrazide) or the redox potential value of the aqueous coating composition (after the addition of carbodihydrazide) can be calculated from the redox potential value at pH x by the following formula:

redox potential Rp @ pH y ≦ Rp @ pHx- ((pH (y) -pHx) × 25) in mV units.

8. The coating composition according to any one of the preceding claims, wherein the carbonyl-functional vinyl polymer particles are obtained by emulsion polymerization.

9. A coating composition according to any one of the preceding claims, wherein the carbonyl-functional vinyl polymer particles are obtained from a monomer mixture comprising: emulsion polymerization comprises carbonyl functional ethylenically unsaturated monomers, carboxylic acid functional ethylenically unsaturated monomers, and other ethylenically unsaturated monomers to form a copolymer, optionally neutralizing the copolymer with a base, and adjusting the pH to at least 6.8.

10. A coating composition according to any one of the preceding claims, wherein the pH of the coating composition is above 7, more preferably above 7.5, most preferably above 8.

11. A coating composition according to any one of the preceding claims, wherein the carbonyl-functional vinyl polymer particles are ketone-functional vinyl polymer particles.

12. A coating composition according to any one of the preceding claims wherein the carbonyl-containing ethylenically unsaturated monomer is diacetone acrylamide.

13. A coating composition according to claim 9 or any one of claims 10 to 12 (when dependent on claim 9), wherein the carboxylic acid functional ethylenically unsaturated monomer is methacrylic acid and/or acrylic acid, preferably methacrylic acid.

14. The coating composition according to any one of the preceding claims, wherein the carbonyl functional vinyl polymer is preferably obtained by copolymerizing a monomer mixture comprising from 70 to 98 wt. -%, more preferably from 80 to 97 wt. -% and most preferably from 85 to 96 wt. -%, based on the total amount of monomers used for preparing the carbonyl functional vinyl polymer, of styrene, acrylonitrile and/or alkyl (meth) acrylate monomers, wherein the chain length of the alkyl group is 1-11 carbons.

15. The coating composition according to any one of the preceding claims, wherein the carbonyl functional vinyl polymer of the composition is obtained by copolymerizing a monomer mixture consisting of (i) diacetone acrylamide, (ii) (meth) acrylic acid and/or β -carboxyethyl acrylate, (iii) styrene, acrylonitrile and/or alkyl (meth) acrylate monomers wherein the chain length of the alkyl group is 1-11 carbon atoms, and (iv) optionally further monomers, wherein the total amount of further monomers is less than 5 wt. -%, more preferably less than 2 wt. -%, based on the total amount of monomers used for preparing the carbonyl functional vinyl polymer.

16. A coating composition according to any one of the preceding claims, wherein the average glass transition temperature of the carbonyl functional vinyl polymer is in the range of from 5 to 60 ℃.

17. The coating composition according to any one of the preceding claims, wherein the coating composition comprises from 0.1 to 8 wt. -%, preferably from 0.3 to 5 wt. -%, most preferably from 0.5 to 3 wt. -% of surfactant, based on the total amount of monomers added for preparing the carbonyl-functional vinyl polymer.

18. Use of an aqueous colloidal dispersion comprising dispersed carbonyl-functional vinyl polymer particles in the preparation of a one-package aqueous coating composition as defined in any of claims 1 to 17 by mixing a carbodihydrazide and the aqueous colloidal polymer dispersion, wherein the one-package aqueous coating composition has an equivalent molar ratio of hydrazide groups to carbonyl groups of from 0.1 to 0.95, the ratio of the number average molecular weight of the carbonyl-functional vinyl polymer to the acid value of the carbonyl-functional vinyl polymer is higher than 400, and the acid value of the carbonyl-functional vinyl polymer is from 2 to 100mg KOH/g of carbonyl-functional vinyl polymer.

19. A method of coating a substrate, the method comprising (i) applying a coating composition according to any one of claims 1 to 17 to a substrate, and (ii) causing or allowing removal of the aqueous carrier medium of the composition, and (iii) crosslinking a coating that has been applied to the substrate.

20. A crosslinked coating obtained by: (i) applying a coating composition according to any one of claims 1 to 17 to a substrate, and (ii) causing or allowing removal of the aqueous carrier medium of the composition, and (iii) crosslinking a coating that has been applied to the substrate.

21. The coating of claim 20, wherein the substrate is selected from the group consisting of:

a) plastic films, such as polypropylene, polyethylene, polyester, polyamide, PVC, polycarbonate, polystyrene, polyurethane, PET, biaxially oriented polypropylene and biaxially oriented PET plastic films,

b) leather, artificial leather; natural and woven synthetic fabrics, such as cotton, wool, rayon; a non-woven fabric comprising a blend of a non-woven fabric,

c) metal substrates such as aluminum and vacuum metallized plastic substrates,

d) the wood is used as a raw material for producing wood,

e) paper, and

g) a), b), c), d) and/or e).

22. The coating according to claim 20 or 21, wherein the application of the coating composition is performed by printing, preferably gravure and flexography.

23. The coating of claim 20 or 21, wherein the coating is an overprint varnish or ink.

Examples