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.

Abstract: A rigid or semi rigid self-skinned cellular plastic structure which is heat recoverable and thermoelastic is prepared by a process wherein a plastisol or pregelified dry-blend of a homo- or copolymer of vinylchloride (PVC dispersion resin), a polymerizable polyfunctional allyl or vinyl monomer (o-diallyl phthalate), and a peroxide catalyst is prepared, and the plastisol or dryblend is heated so that the reacting mass is free to expand without restraint in at least one direction with a temperature rise of 10.degree.-30.degree.C/minute at least up to the temperature at which expansion of the reaction mass starts. This cellular structure is rigid at normal temperatures and behaves like an elastomer at high temperatures. The product can be subjected to fabrication techniques such as sheet molding, encapsulation expansion from compressed foam etc.

Abstract: Compositions suitable for fabricating into a self-sealing film comprise (i) 90-99.95 wt.% of a copolymer of ethylene and a vinyl (or hydrocarbyl substituted vinyl) ester of a C.sub.1 -C.sub.30 monocarboxylic acid, (ii) either 0.05 to 10 wt.% of a hydrocarbon resin, or 0.05 to 5 wt.% of polybutylene or polyisobutylene, or a combination of 0.05 to 10 wt.% of the hydrocarbon resin and 0.05 to 5 wt.% of polybutylene or polyisobutylene, provided the combined weight of the hydrocarbon resin and polybutylene or polyisobutylene is not more than 10 wt.% and (iii) 0.01 to 3.0% by weight based on the combined weight of (i) and (ii) of a partial carboxylic acid ester of a polyol, e.g. sorbitan monolaurate.