Coating of polymer film and sheet

Claim 1

A COMPOSITE ARTICLE COMPRISING A POLYMER SUBSTRATE OF A MONOETHYLENICALLY UNSATURATED HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF POLYSTYRENE, POLYPROPYLENE AND POLYETHYLENE, AND HAVING ON AT LEAST A PORTION OF THE SURFACE THEREOF A COATING CONSISTING ESSENTIALLY OF A COPOLYMER CONTAINING IN CHEMICALLY COMBINED FORM (A) FROM 80 TO 87 PERCENT BY WEIGHT OF VINYLIDENE CHLORIDE (B) FROM 8 TO 20 PERCENT BY WEIGHT OF A MONOMER SELECTED FROM THE GROUP CONSISTING OF METHYL ACRYLATE, METHYL METHACRYLATE, ACRYLONITRILE, ETHYL ACRYLATE AND MIXTURE THEREOF, AND (C) FROM 2 TO 9 PERCENT BY WEIGHT OF AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF ALKYL ACRYLATES WHEREIN THE ALKYL GROUP CONTAINS FROM 2 TO 22 CARBON ATOMS, VINYL CHLORIDE, BUTADIENE AND MIXTURE THEREOF, WITH THE PROVISO THAT THE ACRYLATE MONOMER OF (C) CONTAINS FROM 3 TO 22 CARBON ATOMS WHEN THE MONOMER OF (B) IS ETHYL ACRYLATE, AND WITH THE FURTHER LIMITATTION THAT SAID COPOLYMERS SHOW NO APPRECIABLE CHANGE IN THE STRESS-STRAIN RELATIONSHIP OF A POLYMER FILM WHEN CAST FROM A LATEX AND STORED AT A TEMPERATURE OF BETWEEN 0 AND 50* CENTIGRADE AND THE POLYMER FILM SO CAST SHALL ABSORB LESS INFRARED RADIATION AT A WAVE LENGTH OF 9.58 MICRONS THAN AT A WAVE LENGTH OF 9.75 MICRONS.