Crosslinkable coating compositions

• US 6,555,625 B1
• Filed: 09/20/2001
• Issued: 04/29/2003
• Est. Priority Date: 03/23/1999
• Status: Expired due to Term

• Current Assignee: DSM IP Assets BV (DSM-Firmenich AG)
• Original Assignee: Avecia Limited
• Inventors: Overbeek, Gerardus Cornelis, Tennebroek, Ronald, Smak, Yvonne Wilhelmina
• Primary Examiner(s): Seidleck, James J.
• Assistant Examiner(s): BISSETT, MELANIE D
• Application Number:
  US09/937,098
• Time in Patent Office: 586 Days
• Field of Search: 428/522, 428/423.1, 428/500, 525/191, 525/221, 525/217
• US Class Current: 525/191
• CPC Class Codes: C08G 18/0823 containing carboxylate salt groups or groups forming them
• CPC Class Codes: C08G 18/12 using two or more compounds having active hydrogen in the first polymerisation step
• CPC Class Codes: C08G 18/3231 Hydrazine or derivatives thereof
• CPC Class Codes: C08G 18/606 Polyester-amides
• CPC Class Codes: C08G 18/6254 Polymers of alpha-beta ethylenically unsaturated carboxylic acids and of esters of these acids containing hydroxy groups
• CPC Class Codes: C08G 18/627 Polymers of hydroxylated esters of unsaturated higher fatty acids
• CPC Class Codes: C08L 2666/14 Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• CPC Class Codes: C08L 2666/28 Non-macromolecular organic substances
• CPC Class Codes: C08L 75/14 Polyurethanes having carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09D 133/062 Copolymers with monomers not covered by C09D133/06
• CPC Class Codes: C09D 175/14 Polyurethanes having carbon-to-carbon unsaturated bonds
• CPC Class Codes: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
• CPC Class Codes: Y10T 428/31855 Of addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31935 Ester, halide or nitrile of addition polymer

Abstract

An aqueous crosslinkable coating compositions comprising i) an autoxidisably crosslinkable polymer, ii) a not autoxidisably crosslinkable vinyl polymer bearing acetoacetyl groups and iii) acetoacetyl-reactive groups to crosslink the vinyl polymer.

Claims

1. An aqueous crosslinkable coating composition comprising as aqueous dispersed components:

(i) at least one autoxidisably crosslinkable organic polymer containing unsaturated fatty acid residues, and

(ii) at least one vinyl polymer which is not autoxidisably crosslinkable and bears acetoacetyl functional groups, and wherein said composition has present therein carbonyl-reactive amine and/or hydrazine derivative functional groups which impart crosslinkability to component (ii).

2. A composition according to claim 1 wherein component (i) is a polyurethane polymer.

3. A composition according to claim 2 wherein the polyurethane polymer has been formed by the chain extension of an isocyanate-terminated polyurethane prepolymer with an active hydrogen chain extending compound.

4. A composition according to any one of claims 1 to 3 wherein said vinyl polymer-borne acetoacetyl functional groups are provided by acetoacetate groups of formula

or by acetoacetoacetamide groups of formula

or by 1,3-diketone groups of formula

wherein R¹ is hydrogen or a monovalent hydrocarbyl radical, and where R² is a divalent hydrocarbyl radical.

5. A composition according to any one of claims 1 to 3 wherein the functional amine or hydrazine groups are provided by polyamines or polyhydrazines which are not part of the autoxidisably crosslinkable organic polymer or of the vinyl polymer.

6. A composition according to any one of claims 1 to 3 wherein the hydrazine functional group comprises hydrazine, hydrazone or hydrazide groups.

7. A composition according to any one of claims 1 to 3 wherein the hydrazine functional groups are provided by compounds selected from dicarboxylic acid bis-hydrazides and hydrazones derived therefrom, carbonic acid hydrazides and bis-semicarbazides.

8. A composition according to any one of claims 1 to 3 wherein the autoxidisably crosslinkable polymer containing unsaturated fatty acid residues also bears chain-pendant amine or hydrazine derivative functional groups.

9. A composition according to any one of claims 1 to 3 wherein the vinyl polymer also bears chain pendant amine or hydrazine derivative functional groups.

10. A composition according to any one of claims 1 to 3 wherein the ratio of component (i) to component (ii) is from 90:

10 to 10;

10.

11. A coated substrate having a coating obtained from an aqueous crosslinkable coating composition as claimed in any one of claims 1 to 3.

12. The method which comprises coating an aqueous crosslinkable coating composition as claimed in any one of claims 1 to 3 onto a substrate.