| 摘要 |
<p>A heat-weldable article e.g. a film, made of a crystalline alpha-olefin polymer e.g. polypropylene, has a coating of a copolymer of vinyl chloride with vinyl acetate and a condensation product of a diisocyanate fastening agent e.g. the condensation product of toluene diisocyanate with hexametriol. The surface of the article may be modified by electrical, chemical or thermal treatment e.g. electric discharge, treatment with oxidizing agents. Sulphonates and similar products, or flame treatment, and if in the form of a film may be stretched in two directions, prior to the application of the coating. The coating may be applied, to one or both sides of a film, from solutions or dispersions of the coating composition in water or organic solvents, particularly by spreading, steeping and similar methods.</p> |
