HIGH TRANSPARENCY AND HIGH FLEXIBILITY ELASTOPLASTIC POLYOLEFIN COMPOSITIONS

摘要

Elastoplastic polyolefin compositions endowed with high flexibility and transparency, comprising: A) 10-20 parts by weight of a homopolymer of propylene or a copolymer of propylene with ethylene and/or one or more CH2=CHR alpha -olefin, said copolymer containing at least 95 % by weight of propylene; B) 5-20 parts by weight of a propylene copolymer fraction containing ethylene and insoluble in xylene at room temperature; and C) 60-80 parts by weight of a propylene copolymer fraction containing a comonomer selected from ethylene and mixtures of ethylene with one or more CH2=CHR alpha -olefin and soluble in xylene at room temperature, said fraction containing from 15 to 25 % by weight of said comonomer; the percent by weight of the sum of the B and C components with respect to the total polyolefin composition being from 80 % to 90 %. The compositions of the invention show haze values below 30 %, mostly in the range 15-25 %, whereas the elastic modulus is less than 150 MPa, mostly less than 100 MPa.