Cross-linkable coating composition and method of producing the same

Patent metadata

Field	Value
Publication number	US-9604721-B2
Application number	US-201313920341-A
Country	US
Kind code	B2
Filing date	Jun 18, 2013
Priority date	Jun 18, 2013
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

The instant invention provides cross-linkable coating compositions, process for producing the same, and substrates coated therewith. The cross-linkable coating composition comprises: (a) polyaldehyde, or acetal or hemiacetal thereof; (b) an acid catalyst having pKa of less than 6; (c) a liquid media; (d) an acrylic polycarbamate comprising at least an average of 2.0 carbamate functional groups, wherein said polycarbamate has a glass transition (Tg) of less than 25° C.; and (e) one or more fillers having a pH in the range of equal to or less than 9 and/or one or more pigments having a pH in the range of equal to or less than 9, and/or one or more additives having a pH in the range of equal to or less than 9, wherein said composition has a curing temperature in the range of less than 70° C.

First claim

We claim:

1. A crosslinkable coating composition comprising:
(a) a polyaldehyde;
(b) an acid catalyst having pKa of less than 6;
(c) a liquid media;
(d) an acrylic polycarbamate comprising at least an average of 2.0 carbamate functional groups, wherein said polycarbamate has a glass transition (Tg) of less than 25° C.; and
(e) one or more fillers having a pH in the range of equal to or less than 9 and/or one or more pigments having a pH in the range of equal to or less than 9, and/or one or more additives having a pH in the range of equal to or less than 9,
wherein said composition has a curing temperature in the range of less than 70° C., and wherein said coating composition exhibits pendulum hardness (7 day) in the range greater than 20, a methyl ethyl ketone (MEK) back-and-forth double rubbing of 50 or greater, and a cross-hatch adhesion value of from 4B to 5B.

2. A process for producing a crosslinkable coating composition comprising the steps of:
(a) selecting a polyaldehyde;
(b) selecting an acid catalyst having pKa of less than 6;
(c) selecting a liquid media;
(d) selecting an acrylic polycarbamate comprising at least an average of 2.0 carbamate functional groups wherein said polycarbamate has a glass transition (Tg) of less than 25° C.;
(e) selecting one or more fillers having a pH in the range of equal to or less than 9, and/or one or more pigments having a pH in the range of equal to or less than 9, and/or one or more additives having a pH in the range of equal to or less than 9;
(f) contacting said polyaldehyde, said acid catalyst, said liquid media, said polycarbamate, said one or more filler, and optionally said one or more pigments; and
(g) thereby forming a crosslinkable coating composition;
wherein said composition has a curing temperature in the range of less than 70° C., and wherein said coating composition exhibits pendulum hardness (7 day) in the range greater than 20, a methyl ethyl ketone (MEK) back-and-forth double rubbing of 50 or greater, and a cross-hatch adhesion value of from 4B to 5B.

3. The crosslinking coating composition of claim 1 , wherein said polycarbamate has a glass transition (Tg) of less than 0° C.

4. The crosslinkable composition of claim 1 , wherein said polyaldehyde, has from 2 to 20 carbon atoms or from more than 20 carbon atoms, with the proviso that a polyaldehyde having more than 20 carbon atoms has at least one aldehyde group for every 10 carbon atoms.

5. The crosslinkable composition of claim 4 , wherein said polyaldehyde is selected from the group consisting of (cis,trans)-1,4-cyclohexanedicarboxyaldehydes, (cis,trans)-1,3-cyclohexanedicarboxyaldehydes, and mixtures thereof.

6. The crosslinkable composition of claim 1 , wherein the acrylic polycarbamate component has carbamate groups and hydroxyl groups in a ratio of the equivalents of carbamate groups to the number of equivalents of hydroxyl functional groups of from 1:1 to 20:1.

7. The crosslinkable composition of claim 1 , where said crosslinkable composition further comprises one or more curing inhibitors.

8. The crosslinkable composition of claim 1 , wherein the curing inhibitor is selected from the group consisting of water, an alcohol and a mixture thereof.

Assignees

• Dow Global Technologies Llc
• Rohm & Haas

Inventors

• Popa Paul J
• Schaefer Ben W
• Argyropoulos John N
• Wohltmann Kenneth Everett
• Hofmann Sandra
• Haile Daniel
• Li Yanxiang
• Foley Paul

Classifications

• F05B2280/6011

  Coating · CPC title

• C08G12/46

  Block or graft polymers prepared by polycondensation of aldehydes or ketones on to macromolecular compounds · CPC title

• C08K5/07

  Aldehydes; Ketones · CPC title

• F05D2300/43

  Synthetic polymers, e.g. plastics; Rubber · CPC title

• C09D133/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title