| 主权项 |
1. An article comprising a polyolefin composition comprising:
(a) 15 to 40% by weight of a flexible heterophasic polyolefin composition (I), wherein the flexible heterophasic polyolefin composition (I) comprises the following fractions (wherein the total of A and B fractions is 100%):
A) from 20 to 40% by weight of a crystalline polymer fraction selected from the group consisting of a propylene homopolymer, or a copolymer of
propylene with one or more comonomers selected from ethylene and a CH2═CHR alpha-olefin, where R is a C2-C8 alkyl radical, or mixtures thereof; said homopolymer or copolymer containing at least 85% by weight of units derived from propylene, said crystalline fraction having a fraction insoluble in xylene at 25° C. of at least 90% by weight;B) from 60 to 80% by weight of an elastomeric fraction comprising a copolymer or blend of copolymers of ethylene with one or more comonomers selected from propylene and CH2═CHR alpha-olefins, where R is a C2-C8 alkyl radical, or mixtures thereof; said copolymer or blend containing units derived from ethylene in a quantity lower than 40% by weight;wherein the hetrophasic polyolefin composition has a fraction soluble in xylene at 25° C. of said polyolefin composition having a IVgpc lower than 2.5 dl/g and a broad molecular weight distribution Mw/Mn (GPC) equal to or higher than 4, Mz/Mw (GPC) equal to or higher than 2.5; (b) 40 to 80% by weight of an inorganic filler (II) selected from flame-retardant inorganic fillers and inorganic oxides or salts; and (c) 5 to 25% by weight of an elastomeric polymer or polymer composition having a flexural modulus (ISO 178) lower than 60 MPa, a Shore A (ISO 868) lower than 90 and a Tg (DMTA) lower than −20° C.; wherein the sum of (a), (b) and (c) is 100%%, and wherein the polyolefin composition exhibits a flexural modulus of 300-600 MPa, and a Tg-DSC of below about −40° C., wherein the article is an inner filling, wherein the inner filling is enclosed in an industrial cable or a cable sheathing. |
