Patent ID: 7629404

Claim:
A thermoplastic polyolefin composition comprising: (1) 30-70 wt. % of a heterophasic propylene polymer; the heterophasic propylene polymer comprising: (A) 10-50 wt. % of a crystalline polymer fraction selected from the group consisting of: (i) a propylene homopolymer; and (ii) a copolymer of propylene and at least one alpha-olefin of formula CH 2 ═CHR 3 , wherein R 3 is H or a C 2-8 linear or branched alkyl, said copolymer comprising at least 85 wt. % of propylene units; and (B) 50-90 wt. % of an ethylene copolymer comprising: (iii) 0-20 wt. % of a crystalline fraction of a copolymer of ethylene with at least one alpha-olefin of formula CH 2 ═CHR 4 , wherein R 4 is a C 1-8 alkyl radical, optionally comprising a minor amount of a diene; and (iv) 80-100 wt. % of an elastomeric fraction of a copolymer of ethylene with at least one alpha-olefin of formula CH 2 ═CHR 5 , wherein R 5 is a C 1-8 alkyl radical, optionally comprising a minor amount of a diene, and comprising less than 40 wt. % of ethylene units; (2) 20-60 wt. % of a copolymer of ethylene with a comonomer selected from the group consisting of C 3-6 alpha,beta-unsaturated carboxylic acids, C 1-8 alkyl esters of a C 3-6 alpha,beta-unsaturated carboxylic acid, and mixtures thereof; and (3) 2-20 wt. % of a metal compound selected from the group consisting of acetates, stearates, hydroxides, and oxides of zinc, magnesium, calcium, sodium, and mixtures thereof.