A Cross-Linkable Coating Composition and Method of Producing the Same

Patent metadata

Field	Value
Publication number	US-2016130472-A1
Application number	US-201414899659-A
Country	US
Kind code	A1
Filing date	Jun 5, 2014
Priority date	Jun 18, 2013
Publication date	May 12, 2016
Grant date	—

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

1 . A crosslinkable coating composition comprising:
(a) 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 0° 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.

2 . A process for producing a crosslinkable coating composition comprising the steps of:
(a) selecting a polyaldehyde, or acetal or hemiacetal thereof; (b) selecting an acid catalyst having pKa of less than 6; (c) selecting a liquid media; (d) selecting a acrylic polycarbamate comprising at least an average of 2.0 carbamate functional groups, wherein said polycarbamate has a glass transition (Tg) of less than 0° 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, or acetal or hemiacetal thereof; 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.

3 . A coated substrate comprising:
a substrate; and one or more film layers derived from the crosslinkable coating composition of claim 1 associated with at least one surface of said substrate.

4 . A rotor blade comprising:
a blade having at least one surface; one or more film layers derived from the crosslinkable coating composition of claim 1 associated with at least one said surface of said blade.

5 . The rotor blade of claim 4 , wherein said rotor blade is a wind turbine blade, a helicopter blade, or an aircraft blade.

6 . The coated substrate of claim 1 , wherein said substrate comprises one or more metals, one or more plastics, one or more composite materials, and one or more films derived from one or more primers.

7 . The coated substrate according to claim 3 , wherein said one or more film layers have a thickness in the range of from 5 to 500 μm.

8 . The coated article of claim 3 , wherein said one or more films have an MEK resistance in the range of from greater than 50 double rubs.

9 . The rotor blade of claim 4 , wherein said one or more films have rain erosion resistance of greater than 30 minutes.

10 . The crosslinkable composition of claim 1 , wherein said polyaldehyde, acetal or hemiacetal thereof 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.

11 . The crosslinkable composition of claim 11 , wherein said polyaldehyde, acetal or hemiacetal thereof is selected from the group consisting of (cis,trans)-1,4-cyclohexanedicarboxyaldehydes, (cis,trans)-1,3-cyclohexanedicarboxyaldehydes, and mixtures thereof.

12 . 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.

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

14 . The crosslinkable composition of claim 1 , wherein the curing inhibitor is chosen from water, an alcohol or a mixture thereof.

15 . The crosslinkable composition of claim 1 , wherein the curing inhibitor is chosen from water, an alcohol or a mixture thereof.

Assignees

• Dow Global Technologies Llc

Inventors

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

Classifications

• C09D161/20

  Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen (with amino phenols C09D161/04) · CPC title

• C08K3/22

  of metals · CPC title

• F05D2300/43

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

• C08K3/34

  Silicon-containing compounds · CPC title

• C09D133/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title