Abstract: A polymer composition comprising (a) 99 to 75 weight percent of LLDPE and (b) 1 to 25 weight percent of a copolymer of propylene (CP) with 7 to 40 weight % o one or more C.sub.4 to C.sub.12 alpha-olefins and 0 to 10 weight % of ethylene. The propylene copolymer (CP) has a fusion enthalpy not more than 75 J/g. The composition is readily converted into uniform thickness film by extrusion blowing, and exhibits good hot tack strength during heat-sealing operations.

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 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.

Abstract: The invention relates to a process of thermomechanical treatment in the molten state, in the presence of organic peroxides, of co-polymers with a density less than 0.935, obtained by co-polymerization under a pressure of less than 4 MP.sub.a of ethylene and a higher alpha-olefin. The co-polymers thus treated may advantageously be used for the manufacture of finished objects such as films according to the current techniques of conversion of "high pressure" type polyethylene.

Abstract: The invention relates to a process of thermomechanical treatment in the molten state, in the presence of organic peroxides, of co-polymers with a density less than 0.935, obtained by co-polymerization under a pressure of less than 4 MP.sub.a of ethylene and a higher alpha-olefin. The co-polymers thus treated may advantageously be used for the manufacture of finished objects such as films according to the current techniques of conversion of "high pressure" type polyethylene.