Novel Coating Composition

Patent metadata

Field	Value
Publication number	US-2016244635-A1
Application number	US-201415023969-A
Country	US
Kind code	A1
Filing date	Oct 1, 2014
Priority date	Oct 4, 2013
Publication date	Aug 25, 2016
Grant date	—

Abstract

A coating composition comprising: a) a film forming resin comprising secondary amine groups, b) a polyisocyanate curing agent and c) solid particles of an amino resin based polymer.

First claim

1 . A coating composition comprising:
a) a film forming resin comprising secondary amine groups, b) a polyisocyanate curing agent and c) solid particles of an amino resin based polymer.

2 . The coating composition according to claim 1 wherein (a) and (b) are present in the coating composition in an amount so that the stoichiometric ratio of isocyanate groups:secondary amine groups is 1.0:1.0 to 2.5:1.0.

3 . The coating composition according to claim 1 wherein the film forming resin comprising secondary amine groups is a polyaspartic ester amine.

4 . The coating composition according to claim 1 wherein the amino resin based polymer is a methyl urea based polymer.

5 . The coating composition according to claim 1 wherein the amino resin based polymer is a crosslinked polymer.

6 . The coating composition according to claim 1 wherein the solid particles of the amino resin based polymer are present in an amount of 1 to 25% by weight, based on the weight of the total coating composition.

7 . The coating composition according to claim 1 wherein the polyisocyanate curing agent has an isocyanate equivalent weight of between 280 g/eq to 840 g/eq, for example between 280 g/eq to 500 g/eq.

8 . The coating composition according to claim 1 wherein the film forming resin comprising secondary amine groups has an amine equivalent weight of between 150 g/eq and 450 g/eq.

9 . The coating composition of claim 1 wherein (a) and (b) are present in the coating composition in an amount so that the stoichiometric ratio of isocyanate groups:secondary amine groups is greater than 1.5:1.0 to a maximum ratio of 2.5:1.0.

10 . The coating composition of claim 3 wherein the polyaspartic ester amine has the following structure:

wherein X represents an alicylic hydrocarbon which is inert towards isocyanate groups at temperatures of up to 100° C.;
R 1 and R 2 are each independently selected from organic groups which are inert toward isocyanate groups at temperatures of up to 100° C.;
R 3 and R 4 each are independently selected from hydrogen and organic groups which are inert towards isocyanate groups at temperatures of up to 100° C.; and
n is an integer of at least 2.

11 . The coating composition of claim 3 wherein the coating composition is provided in two packs, a first pack comprising the polyaspartic ester amine and a second pack comprising the polyisocyanate curing agent.

12 . A method of protecting a substrate against rain erosion or solid particle erosion by
providing a coating composition comprising a film forming resin comprising secondary amine groups, a polyisocyanate curing agent and solid particles of an amino resin based polymer as defined in claim 1 , applying the coating composition to the substrate to form one or more coating layer(s) on the substrate, and allowing the coating layer(s) to harden on the substrate at ambient temperature.

13 . The method of claim 12 , wherein the substrate is a wind blade or a part thereof.

14 . A coated wind blade or a part thereof, wherein the wind blade or part thereof is coated with a coating composition as defined in claim 1 .

15 . (canceled)

Assignees

• Akzo Nobel Coatings Int Bv

Inventors

• Wouldhave Matthew
• Kanatt Bijoy
• Hesselink Sebastiaan J A
• Donkin Michael David

Classifications

• F05B2230/90

  Coating; Surface treatment · CPC title

• F03D1/0675

  of the blades · CPC title

• C08G18/792

  formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates · CPC title

• C09D175/02 Primary

  Polyureas · CPC title

• C08G18/4623 Primary

  containing primary or secondary terminal aminogroups · CPC title