GB1034337A - Low pressure polyolefine films - Google Patents

Abstract

Films of crystalline a -olefin polymers have incorporated therin (A) 0.1 to 1.0 weight per cent of a substance of formula <FORM:1034337/C3/1> where x and y total 2 to 5 and R is a C12- 22 monovalent aliphatic hydrocarbon radical, which may be the acyl radical of a C12- 22 fatty acid, and (B) 0.01 to 0.5 weight per cent of an amide of a C10- 22 fatty acid. (A) may be a condensation product of ethylene oxide with tallow amine, lauryl amine, oleyl amine, stearyl amine, lauramide, oleamide, stearamide, behenamide or amides of acids derived from beef tallow, mutton tallow, butter fat, coconut oil, corn oil, cotton seed oil, lard oil, olive oil, peanut oil, soya bean oil or sesame oil. (B) may be decanamide, lauramide, myristamide, palmitamide, stearamide, oleamide, erucamide, distearamide, ethylene distearamide or hydroxystearamide. Specified olefin polymers are propylene and 4-methyl pentene1 polymers, block copolymers of propylene and ethylene, and mixtures of polypropylene and polyterpenes. Other additives, e.g. starch, talc, zinc oxide, calcium carbonate, magnesium carbonate, silica, clay and diatomaceous earths, may also be incorporated. Compositions for melt spinning may be prepared by blending the additives with the molten polymer and cooling and comminuting the mixture. The films may be oriented by stretching in one or more directions and heat set. Examples describes films made of compositions comprising isotactic polypropylene, silica and (1 and 3) a tallow amine/ethylene oxide condensate together with (2 and 4) oleamide.