Self-Crosslinking Alkyd Dispersion

• US 20060199941A1
• Filed: 03/02/2006
• Published: 09/07/2006
• Est. Priority Date: 03/04/2005
• Status: Active Grant

• Current Assignee: Arkema Incorporated (Arkema)
• Original Assignee: Cook Composites and Polymers
• Inventors: Julien, Tim, Ryer, Dennis, Willhite, John
• Granted Patent: US 7,220,802 B2
• Time in Patent Office: Days
• US Class Current: 528/272
• CPC Class Codes: C08F 212/08 Styrene
• CPC Class Codes: C08F 220/06 Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
• CPC Class Codes: C08F 220/1804 C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
• CPC Class Codes: C08F 283/00 Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
• CPC Class Codes: C08G 63/48 by unsaturated higher fatty oils or their acids; by resin acids
• CPC Class Codes: C08G 63/91 Polymers modified by chemical after-treatment
• CPC Class Codes: C08L 2666/28 Non-macromolecular organic substances
• CPC Class Codes: C09D 167/08 Polyesters modified with higher fatty oils or their acids, or with natural resins or resin acids
• CPC Class Codes: C09D 4/00 Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16

Abstract

A coating composition is produced by forming an aqueous dispersion of a crosslinking agent and a resin that comprises the reaction product of an alkyd polymer, an optional surfalkyd, diacetone acrylamide, another acrylate monomer and optionally aromatic monomers wherein the reaction product is neutralized with either ammonia or an amine. A coating of the aqueous dispersion on wood exhibits at least some of the following desired properties: rapid dry time, good tannin blocking, good resistance to picking up dirt, good hot box stability and good exterior durability. Additionally, the inventive coatings appear to provide improved crosslinking compared to coatings comprising resins not neutralized with an amine or ammonia and/or not containing a surfalkyd.

Claims

1. A resin comprising the reaction product obtained by reacting an alkyd polymer, and optionally a surfalkyd, with a blend of diacetone acrylamide, acrylate monomers and optionally aromatic monomers to form an acrylated alkyd polymer and neutralizing the acrylated alkyd polymer with either ammonia or an amine.

2. The resin according to claim 1, wherein the acrylate monomers is or comprises acrylic acid.

3. The resin according to claim 1, wherein the surfalkyd is present and wherein, it is the reaction product of a polyethylene glycol and of an acid.

4. The resin of claim 1, wherein amine is neutralizing the acrylated alkyd polymer.

5. The resin of claim 1, wherein the acrylated alkyd polymer is obtained in the absence of a surfalkyd.

6. An aqueous resin dispersion, wherein it comprises at the dispersed form, at least one resin according to claim 1.

7. A resin composition comprising:

an aqueous dispersion of;

(i) a resin, the resin obtained by reacting an alkyd polymer, and optionally a surfalkyd, with a blend of diacetone acrylamide, acrylate monomers, and optionally aromatic monomers to form an acrylated alkyd polymer and neutralizing the acrylated alkyd polymer with either ammonia or an amine and (ii) a crosslinking agent.

8. The coating composition according to claim 7, wherein a co-solvent is present in the aqueous dispersion.

9. The coating composition according to claim 7, wherein the cross-linking agent is adipic dihydrazide.

10. The coating composition of claim 7, wherein the resin dispensed in the aqueous dispersion has a particle size of about 50 to about 120 nm.

11. The coating composition according to claim 7, wherein the resulting coating fulfils at least a part of the following functions:

rapid dry time, good tannin blocking, good resistance to picking up dirt, good hot box stability, good exterior durability and improved crosslinking.

12. A process for making a coating composition, the process comprising:

reacting an alkyd polymer, an optional surfalkyd, a blend of diacetone acrylamide, acrylate monomers, and optionally aromatic monomers to form an acrylated alkyd polymer;

neutralizing the acrylated alkyd polymer with either ammonia or an amine; and

,

mixing the neutralized acrylated alkyd polymer with water and a cross-linking agent to form an aqueous dispersion.

13. The process for neutralizing an alkyd polymer as defined according to claim 12, the process comprising reacting either ammonia or an amine with the alkyd polymer.

14. The process of claim 12, wherein the acrylate monomer comprises acrylic acid.

15. The process of claim 12, wherein the surfalkyd is a reaction product of polyethylene glycol and an acid.

16. The process of claim 12, wherein the cross-linking agent is adipic dihydrazide.