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PUBLISHED DECEMBER 2, 1975 T94l,020 POLYOLEFIN FILMS AND METHODS FOR MAKING SAME Roger Neville Young, Chesham, England. assignor to Imperial Chemical Industry Limited, London, England Filed Nov. 13, 1974, Ser- No. 523,530 Claims priority, application Great Britain, Dec. 21, 1973,
 59.338/73 Int. Cl. 1332b 27/30, 27/32 US. Cl. 428-349 1 Sheet Drawing. 21 Pages Specification u wwwwar A heat sealable film for use in packaging comprising a polyol'efin film substrate at least one surface of which is coated with a layer of a heat sealable material, wherein the film substrate is formed from a composition comprising a. blend of from 87.5 to 60 parts by weight of polypropylene and from 12.5 to 40 parts by weight of a block copolymer of ethylene and propylene, the eopolymer containing from 0.5 to 40% by weight of ethylene, based on the weight of the copolymer, and the blend containing from 0.2 to 5% by weight of ethylene, based on the weight of the blend.
uvv- 1,v 1] IJ K.- N. YOUNG POLYOLEFIN FILMS AND METHO FOR MAKING SAME Original Filed Nov 13, 1974