Base paints comprised of polyamide powders for use in coating PVC structures

• US 5,626,958 A
• Filed: 02/01/1994
• Issued: 05/06/1997
• Est. Priority Date: 02/05/1993
• Status: Expired due to Fees

• Current Assignee: Elf Atochem S.A.
• Original Assignee: Elf Atochem S.A.
• Inventors: Moulin, Thierry, D'Herbecourt, Bruno
• Primary Examiner(s): NAKARANI, DHIRAJLAL S
• Application Number:
  US08/190,748
• Time in Patent Office: 1,190 Days
• Field of Search: 524/315, 524/356, 524/364, 525/123, 525/178, 525/420, 525/424, 525/425, 525/434, 428/323, 428/327, 428/423.5, 428/423.7, 428/424.4, 428/424.6, 428/476.1, 428/475.8, 428/476.9, 428/413, 428/482, 428/483, 428/518, 428/520, 427/421
• US Class Current: 428/327
• CPC Class Codes: C08G 18/4063 Mixtures of compounds of group C08G18/62 with other macromolecular compounds
• CPC Class Codes: C08J 2327/06 Homopolymers or copolymers of vinyl chloride
• CPC Class Codes: C08J 2475/00 Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
• CPC Class Codes: C08J 7/0427 with only one layer of a composition containing a polymer binder with more layers C08J7/042
• CPC Class Codes: C08J 7/043 Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: C08J 7/046 Forming abrasion-resistant coatings; Forming surface-hardening coatings
• CPC Class Codes: C08L 77/00 Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C09D 175/04 Polyurethanes
• CPC Class Codes: Y10T 428/254 Polymeric or resinous material
• CPC Class Codes: Y10T 428/31511 Of epoxy ether
• CPC Class Codes: Y10T 428/31562 Next to polyamide [nylon, etc.]
• CPC Class Codes: Y10T 428/31565 Next to polyester [polyethylene terephthalate, etc.]
• CPC Class Codes: Y10T 428/31576 Ester monomer type [polyvinylacetate, etc.]
• CPC Class Codes: Y10T 428/3158 Halide monomer type [polyvinyl chloride, etc.]
• CPC Class Codes: Y10T 428/31743 Next to addition polymer from unsaturated monomer[s]
• CPC Class Codes: Y10T 428/31746 Polymer of monoethylenically unsaturated hydrocarbon
• CPC Class Codes: Y10T 428/31757 Polymer of monoethylenically unsaturated hydrocarbon
• CPC Class Codes: Y10T 428/31797 Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/3192 Next to vinyl or vinylidene chloride polymer
• CPC Class Codes: Y10T 428/31928 Ester, halide or nitrile of addition polymer

Abstract

The invention relates to a coating composition for PVC sections, based on a polymeric vehicle, a crosslinking agent, and a thermoplastic resin powder. The coating composition is particularly useful for coating PVC sections for windows, shutters, and doors. PVC joinery coated with the composition of the invention has exceptional impact strength and resistance to abrasion, friction, and inclement weather.

Claims

1. A coating composition suitable for coating polyvinyl chloride articles of manufacture, said composition being curable on a substrate (i) in an oven at a temperature between 20°

C. and 80°

C. or (ii) under infrared stoving at a surface temperature of between 50°

C. and 100°

C.,

said composition comprising;

a) a vehicle comprising polyacrylate, epoxy resin, polyether, polyester, polycaprolactone, vinyl chloride polymers or mixtures thereof, which polymers contain hydroxyl groups, carboxyl groups, or both said groups,

b) an isocyanate crosslinking agent,

c) a solvent for said vehicle and crosslinking agent, and

d) finely divided thermoplastic resin particles ranging in size from 0.05 to 200 μ

m in suspension,

wherein said vehicle is branched to the extent that the paint film which is obtained by crosslinking said composition to form a film that is adherent to said PVC article of manufacture allows the plasticizers used in making said PVC article of manufacture to exude through said paint film and wherein said composition contains essentially no silicone oil.

2. A composition according to claim 1, wherein said vehicle is a mixture of two resins A1 and A2, in which:

A1 is a resin containing hydroxyl and/or carboxylic groups, and

A2 is a chlorinated vinyl resin containing hydroxyl and/or carboxylic groups.

3. A composition according to claim 2, characterized in that the resin A1 is a hydroxylated polyester resin and the resin A2 is a hydroxylated vinyl acetochloride copolymer.

4. A composition according to one of claims 1 to 3, wherein said crosslinking agent is a non-blocked polyisocyanate compound.

5. A composition according to one of claims 1 to 3, wherein said finely divided thermoplastic resin is a polyamide powder.

6. A composition according to one of claims 1 to 3, wherein said composition also contains pigments, dyes, and fillers.

7. An article of manufacture comprising PVC sections or joinery and its accessories made of PVC, wherein said sections, joinery, and joinery accessories are coated with a composition according to claim 1.

8. A method of making an article of manufacture comprising coated PVC sections or joinery and its accessories made of PVC which comprises coating said sections, joinery, and joinery accessories with a composition according to claim 1.

9. The coating composition of claim 1 wherein said finely divided thermoplastic resin particles range in size from about 20 μ

m to about 60 μ

m.

10. A coating composition suitable for coating polyvinyl chloride articles of manufacture that consists essentially of:

a) a vehicle comprising a mixture of two resins A1 and A2, in which;

A1 is a resin containing hydroxyl and/or carboxylic groups, and

A2 is a chlorinated vinyl resin containing hydroxyl and/or carboxylic groups,

b) an isocyanate crosslinking agent,

c) a solvent for said vehicle and crosslinking agent,

d) finely divided thermoplastic resin particles ranging in size from 0.05 to 200 μ

m in suspension, and

e) one or more members selected from the group consisting of pigments, dyes, and fillers,

wherein said vehicle is branched to the extent that the paint film which is obtained by crosslinking said composition to form a film that is adherent to said PVC article of manufacture allows the plasticizers used in making said PVC article of manufacture to exude through said paint film and wherein said composition contains essentially no silicone oil.