Microgels prepared using hybrid crosslinker systems and coating compositions having microgels prepared therefrom

Patent metadata

Field	Value
Publication number	US-10053594-B2
Application number	US-201414771635-A
Country	US
Kind code	B2
Filing date	Mar 11, 2014
Priority date	Mar 14, 2013
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

The present invention includes coating compositions having a microgel, wherein the microgel is prepared from a carboxyl functional polymer and a hybrid crosslinker system, wherein the hybrid crosslinker system has a first crosslinker having an epoxy resin and a second crosslinker having a thermally active crosslinker.

First claim

What is claimed is:

1. A coating composition comprising
a bisphenol A-free microgel formed from the reaction of a carboxyl functional polymer and a first crosslinker comprising an epoxy resin,
and
a second crosslinker comprising a thermally active crosslinker capable of crosslinking the coating composition at heating temperatures ranging from 120° C. to 275° C., wherein the second crosslinker is present during the formation of the bisphenol A-free microgel.

2. The coating composition of claim 1 , wherein the microgel has a mean particle size less than 1 micron.

3. The coating composition of claim 1 , wherein the carboxyl functional polymer is present in an amount from about 20 to about 95 wt % of the microgel.

4. The coating composition of claim 1 , wherein the first crosslinker is present in an amount from about 0.5 to about 50 wt % of the microgel.

5. The coating composition of claim 1 , wherein the second crosslinker is present in an amount from about 1 to about 80 wt % of the microgel.

6. The coating composition of claim 1 , wherein the second crosslinker comprises a phenolic compound, urea formaldehyde, an oxazoline compound, a blocked isocyanate, a melamine compound, or a mixture of the foregoing.

7. The coating composition of claim 1 , wherein the carboxyl functional polymer has an acid number of about 40 to about 400 mg KOH/gram.

8. A substrate coated with the coating composition of claim 1 .

9. A coating composition comprising
a bisphenol A-free microgel formed from the reaction of a carboxyl functional polymer and a first crosslinker comprising an epoxy resin
and
a second crosslinker comprising a thermally active crosslinker, which is capable of crosslinking the coating composition at heating temperatures ranging from 120° C. to 275° C., wherein the second crosslinker comprises a phenolic compound which is the reaction product of phenol or a substituted phenol with formaldehyde, urea formaldehyde, an oxazoline compound, a blocked isocyanate, a melamine compound, or a mixture thereof, and wherein the second crosslinker is present during the formation of the bisphenol A-free microgel.

10. The coating composition of claim 9 , wherein the microgel has a mean particle size less than 1 micron.

11. The coating composition of claim 9 , wherein the first crosslinker is present in an amount from about 0.5 to about 50 wt % of the microgel.

12. The coating composition of claim 9 , wherein the second crosslinker is present in an amount from about 1 to about 80 wt % of the microgel.

13. The coating composition of claim 9 , wherein the carboxyl functional polymer has an acid number of about 40 to about 400 mg KOH/gram.

Assignees

• Akzo Nobel Coatings Int Bv

Inventors

• Craun Gary Pierce

Classifications

• C09D201/08

  Carboxyl groups · CPC title

• C08J3/243

  Two or more independent types of crosslinking for one or more polymers · CPC title

• C08G18/8074

  Lactams · CPC title

• C09D133/12 Primary

  Homopolymers or copolymers of methyl methacrylate · CPC title

• C09D133/064 Primary

  containing anhydride, COOH or COOM groups, with M being metal or onium-cation · CPC title