Thermosetting powder coatings

A powder coating composition which comprises a mixture of:

• A. a vinyl polymer of (a) from 50 to 90 weight per cent of vinyl chloride, (b) from 1 to 25 weight per cent of glycidyl acrylate or methacrylate compound, (c) from 0 to 40 weight per cent of vinyl acetate and (d) from 0 to 40 weight per cent of other ethylenically unsaturated polymerizable monomers having the >C=C<
• group;
• said polymer having a number average molecular weight of from 2,500 to 40,000;
• B. an epoxy resin plasticizer at a concentration of from 1 to 15 weight per cent of said vinyl polymer;
• said plasticizer selected from the group consisting of bisphenol epoxide resins, cycloaliphatic epoxides and resins thereof, aliphatic diglycidyl ethers and esters and epoxidized fatty oils;
• and
• C. a crosslinker for the oxirane moiety in said vinyl polymer and said epoxy resin plasticizer, said crosslinker being present at a concentration of from 0.1 to 1 mole equivalent of reactive group thereof per mole equivalent of oxirane group.