1,177,997. Coatings. MONSANTO CO. 24 Nov., 1967 [25 Nov., 1966], No. 53602/67. Heading B2E. [Also in Division C3] A material susceptible to penetration by liquids, water vapors or gases is treated to increase its resistance thereto by applying to the surface of said material a layer of a latex of an ethylene-vinyl chloride copolymer having 20 to 95% polymerised vinyl chloride, in an amount of 0.5 to 90 lbs per 3,000 sq. ft. of said surface, removing the water from the latex layer, thereafter fusing the remaining solids, by heat, into a continuous film, and allowing the product to cool. The treatment is most suitably carried out on paper and yields a tack-free film. The latex may contain other polymers. Coatings of other polymers may be applied in addition to the latex described above. In the Examples the latex is applied by means of various wire wound rods in a drawdown bar.
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