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Polymer powder coating composition
| Details |
Inventors: Yallourakis, Michael Dimitri;
Assignee: E. I. Du Pont de Nemours and Company (Wilmington, DE)
Primary Examiner: Lesmes; George F.
Assistant Examiner: Robinson; Ellis P.
Attorney, Agent or Firm:
A powder coating composition consisting essentially of powder particles that have diameters of less than 100 microns, wherein the powder particles consist essentially of a blend of: A. vinyl chloride/vinyl acetate/maleic anhydride polymer, B. plasticizer, C. liquid epoxy resin, and D. a mixture of mono-butyl tin mercaptide and di-butyl tin mercaptide. The powder coating composition is useful for providing film coatings upon the metal exteriors of products such as tubing, wires, fence posts, lawn furniture and the like. |
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DETAILED DESCRIPTION What is claimed is: 1.
A powder coating composition consisting essentially of powder particles having diameters of less than 100 micron; wherein the powder particles consist essentially of a blend of: A.
50-93% by weight of vinyl chloride/vinyl acetate/maleic anhydride (VC/VA/MA) polymer having a monomer weight ratio range for each monomer of VC 55-95 parts, VA 5-35 parts and MA .
2-10 parts and having a number average molecular weight range of 20,000-50,000, B.
5-30% by weight of plasticizer, C.
1-10% by weight of liquid epoxy resin and, D.
1-10% by weight of a mixture of mono-butyl tin mercaptide and di-butyl tin mercaptide.
2.
The composition of claim 1 wherein the mixture of mono-butyl tin mercaptide and di-butyl tin mercaptide has a tin content of 21-25% and sulfur content of 9-12%.
3.
The composition of claim 1 containing one or more ultraviolet light absorber, pigment and/or filler.
4.
The composition of claim 3 wherein 1-10% by weight of the composition consists of pigment; said pigment consisting essentially of titanium dioxide, carbon black, phthalocyanine green and chrome antimony titanate.
5.
The composition of claim 3 wherein the pigment consists essentially of: A.
3-4% by weight, based on weight of total pigment, of titanium dioxide, B.
3-4% by weight, based on weight of total pigment, of carbon black, C.
32-36% by weight, based on weight of total pigment, of phthalocyanine green, and D.
58-62% by weight, based on weight of total pigment, of chrome antimony titanate.
6.
The powder coating composition of claim 1 wherein the powder particles consist essentially of a blend of: A.
50-75% by weight of vinyl chloride/vinyl acetate/maleic anhydride (VC/VA/MA) polymer having a monomer weight ratio range for each monomer of VC 55-95 parts, VA 5-35 parts and MA .
2-10 parts and having a number average molecular weight range of 20,000-50,000, B.
12-18% by weight of triisodecyl trimellitate, C.
2-4% by weight of a liquid epoxy resin of bisphenol A/epichlorohydrin, D
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Fuel Cells 
