Coating composition

• US 20050072332A1
• Filed: 12/19/2002
• Published: 04/07/2005
• Est. Priority Date: 12/21/2001
• Status: Active Grant

• Current Assignee: Croda International PLC
• Original Assignee: Uniqema B.V. (Croda International Plc (Technology Investment Group))
• Inventors: Honcoop, Wilhelmus Jacobus Adrianus, Appelman, Eric
• Granted Patent: US 7,541,093 B2
• Time in Patent Office: Days
• US Class Current: 106/14.420
• CPC Class Codes: C08G 59/5013 containing more than seven carbon atoms, e.g. fatty amines
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C09D 163/00 Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
• CPC Class Codes: Y10T 428/31511 Of epoxy ether
• CPC Class Codes: Y10T 428/31515 As intermediate layer
• CPC Class Codes: Y10T 428/31522 Next to metal
• CPC Class Codes: Y10T 428/31529 Next to metal

Abstract

A coating composition containing an epoxy resin and a curing agent comprising a trimer fatty triamine and/or higher oligomeric amine. The coating composition is particularly suitable for use as a primer coating layer on concrete and steel.

Claims

1. A coating composition comprising an epoxy resin and a curing agent comprising at least one trimer fatty triamine and/or higher oligomeric amine.

2. A composition according to claim 1 wherein the epoxy resin has an epoxy equivalent weight in the range from 160 to 4000 g.

3. A composition according to claim 1 wherein the trimer fatty triamine is A trimer of C₁₀ to C₃₀ alkyl chains.

4. A composition according to claim 1 wherein the oligomeric amine is an oligomer, comprising 4 or more units, of C₁₀ to C₃₀ alkyl chains.

5. A composition according to claim 1 wherein the curing agent additional comprises a dimer fatty diamine.

6. A composition according to claim 1 wherein the curing agent comprises in the range from 30 to 70% by weight of trimer fatty triamine, 30 to 70% by weight dimer fatty diamine, and 1 to 6% by weight of mono fatty monoamine, all based on the total weight of trimer, dimer and monomer amine present in the curing agent.

7. A composition according to claim 1 wherein the curing agent comprises in the range from 5 to 35% by weight of oligomeric amine, 15 to 55% by weight of trimer fatty triamine, and 25 to 80% by weight of dimer fatty diamine, all based on the total weight of oligomeric, trimer, and dimer amine present in the curing agent.

8. An epoxy resin cured with a trimer fatty triamine and/or higher oligomeric amine.

9. The use of a trimer fatty triamine and/or higher oligomeric amine to cure an epoxy resin.

10. A concrete substrate coated with (i) a primer layer formed from a coating composition comprising an epoxy resin and a curing agent comprising at least one trimer fatty triamine and/or higher oligomeric amine, and (ii) an additional epoxy resin coating layer, different from the primer layer, optionally comprising fitter.

11. A steel substrate coated with (i) a primer layer formed from a coating composition comprising an epoxy resin and a curing agent comprising at least one trimer fatty triamine and/or higher oligomeric amine, and (ii) an additional alkyd resin or polyurethane resin coating layer.

12. A method of making a coating composition comprising (i) polymerising fatty acids under pressure to produce a reaction mixture comprising mono fatty acid and/or dimer fatty acid and/or trimer fatty acid, (ii) converting at least one of the acids in the reaction mixture produced in (i) to an amine, and (iii) mixing at least one of the amines produced in (ii) with an epoxy resin, with the proviso that at least one of the amines is a trimer fatty triamine or a higher oligomeric amine.