Polymerizable coating composition containing polymerizable epoxide compound and vinyl chloride dispersion polymer and method of coating utilizing same and coated articles produced thereby

摘要

A polymerizable coating composition comprises 35-80 parts of an epoxy prepolymer material and 20-65 parts of a vinyl chloride dispersion polymer together with 0.5-10 percent by weight, based upon the weight of the epoxy prepolymer material, of an onium salt photoinitiator which decomposes upon exposure to electromagnetic radiation to initiate polymerization of the epoxy prepolymer material. The vinyl chloride polymer has a high molecular weight represented by an inherent viscosity of 0.60-1.60 and a particle size of 0.5-20.0 microns. The coating is applied to the surface of a substrate and then exposed to a source of electromagnetic radiation to decompose the photoinitiator and initiate polymerization of the epoxy prepolymer material to a tack-free surface condition in which the vinyl chloride polymer is dispersed within the epoxy polymer. This is desirably effected by maintaining the coating at a temperature of about 50 DEG -90 DEG C. for a limited time following exposure to radiation. After the coating has been cured to a tack-free condition, it is desirably baked at a temperature of at least 150 DEG C. to effect substantial fusion of the vinyl chloride polymer and cross-linking of the epoxy polymer.