Abstract: A composition suitable for fabricating into a self-sealing film comprises:I. 95.0 to 99.9 wt.% of either a copolymer of ethylene and vinyl acetate, said copolymer containing 0.10 to 1.95 wt.% of the vinyl acetate, or 95.0 to 99.9 wt.% of a mixture of a thermoplastic polyolefin and a copolymer of ethylene and vinyl acetate, the proportion of polymerized vinyl acetate in the mixture being from 0.10 to 1.95 wt.% andIi. 0.01 to 5.0 wt.% of a partial ester of a carboxylic acid and a polyol, e.g. sorbitan monolaurate.The film can be made for example by tubular blowing.

Abstract: A composition suitable for fabricating into a self-sealing film comprises:I. 85 to 99.8 wt.% of a thermoplastic polyolefin, e.g. polyethylene,Ii. 0.1 to 10.0 wt.% of a partial ester of a carboxylic acid and a polyol e.g. sorbitan mono laurate, sorbitan monostearate or sorbitan monobehenate andIii. either 0.1 to 10 wt.% of hydrogenated hydrocarbon resin or 0.1 to 10 wt.% of polybutene or polyisobutene, provided the combined weights of (ii) and (iii) is not more than 15 wt.%.The film may be made by tubular blowing.