anvendning of a poly 1 - butene or copolymers of 1 - butene coated paper skiljepapper

摘要

1390203 Cast films CHEMISCHE WERKE HULS AG 10 March 1972 [12 March 1971] 11228/72 Heading B5B [Also in Division B2] A supported film of thermoplastics material is made by coating a sheet of paper with a polymer or copolymer of butene-1 as release layer and coating the release layer with the layer of strippable thermoplastics material. Crepe paper, newsprint paper and sodium paper are mentioned. Copolymers may be ethylene, propylene or higher -olefins which are predominantly crystalline and have a melting range not starting below 120‹ C., present in a molar ratio below 40 : 60. The paper may be roughened before application of the polymer or copolymer. The butene-1 coating may be applied by roller, extruder or calender, and may contain up to 85 wt. per cent of filler. The detailed production of several films which are stripped from the release paper is outlined, the thermoplastic film comprising (Example 1), plasticized p.v.c., (2) linear polyurethane or (3) plasticized vinyl chloride/vinyl acetate copolymer. The film may be applied as solution, dispersion powder, fused granules or plastisol and may be extruded on to the release layer.