Acrylic polyblend powder coating composition
Abstract
Abstract THE THERMOPLASTIC ACRYLIC POLYMER POWDER CONTAINING COMPOSITION COMPRISES FINELY DIVIDED PARTICLES HAVING A DIAMETER OF 1-75 MICRONS HEREIN THE POWDER PARTICLES ARE A BLEND OF (A) 50-74.5% BY WEIGHT OF POLYMETHYL METHACRYLATE OR A COPOLYMER OF METHYL METHACRYLATE AND AN ALKYL METHACRYLATE HAVING 4-12 CARBON ATOMS IN THE ALKYL GROUP OR A BLEND OF POLYMETHYL METHACRYLTE AND A COPOLYMER OF METHYL METHACRYLATE; (B) 10-20% BY WEIGHT OF A HYDROXY CONTAINING ACRYLIC COPOLYMER OF METHYL METHACRYLATE, AN ALKYL METHACRYLATE HAVING 2-12 CARBON ATOMS IN THE ALKYL GROUP OR AN ALKYL ACRYLATE HAVING 1-12 CARBON ATOMS IN THE ALKYL GROUP, A HYDROXY ALKYL ACRYLATE, A METHACRYLATE, AND AN A,B-ETHYLENICALLY UNSATURATED CARBOXYLIC ACID; (C) 15-30% BY WEIGHT OF AN ORGANIC PLASTICIZER, (D) 0.5-3% BY WEIGHT OF A CROSS-LINKING AGENT SUCH AS AN ALKYLATED MELAMINE RESIN OR A BLOCK POLYISOCYANATE; THE POLYMER POWDER PARTICLES HAVE A GLASS TRANSITION TEMPRATURE OF 30-60*C. AND A MELT VISCOSITY OF BELOW 75,000 POISES MEASURED AT 160*C. AND CAN CONTAIN PIGMENTS AND DYES, THE NOVEL ACRYLIC POLYMER POWDER COATING COMPOSITION IS PARTICULARLY USEFUL AS AN EXTERIOR FINISH FOR AUTOMOBILIES AND TRUCKS.
Inventors
- 👤 P Pettit
Bibliographic Details
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