Abstract: The invention concerns polyethylene compositions particularly adapted for the manufacture of film and hollow bodies by blow-moulding, characterized in that they contain(a) from 50 to 98% by weight of polyethylene of high density, of at least 0.940(b) from 2 to 50% by weight of a linear, low density polyethylene, with a density below 0.930.

Abstract: The invention concerns polypropylene compositions with improved impact strength adapted for conversion to finished articles by extrusion drawing, extrusion blow-molding or thermoforming characterized in that they contain:(a) 40 to 98% by weight of isotactic polypropylene(b) 2 to 60% by weight of a copolymer of linear low density polyethylene type with a density of up to 0.935, obtained by copolymerizing a mixture of ethylene and one or more upper alpha-olefins, by a copolymerizing process at a pressure below 4.10.sup.6 Pa, in the absence of any liquid hydrocarbons.

Abstract: The invention relates to a composition suitable for the manufacture of cling film, comprising 80 to 99% by weight of at least one polymer or copolymer of ethylene having a density less than or equal to 0.935, and from 1 to 20% by weight of the total composition comprising:(a) A cling agent chosen from amongst liquid polybutenes and atactic polypropylenes and(b) At least one crystalline wax in a quantity of 0.01 and 50% by weight based on the weight of (a) and (b) together.

Abstract: The invention concerns polypropylene compositions with high impact strength adapted to the manufacture of car components such as bumpers or dashboards, characterized in that they contain:(a) 50 to 97% by weight of isotactic polypropylene(b) 2 to 49% by weight of elastomer(c) 1 to 30% by weight of linear low density polyethylene, of a density up to 0.935.