Composition of propylene materials and olefin polymer materials with reduced gloss.

摘要

A polyolefin compsn. comprises (A) 70-90 wt. % propylene polymer material and (B) 30-10 wt. % olefin polymer material, wherein (A) comprises: (1) 10-50 wt. % propylene homopolymer having an isotactic index of 80-99, or a copolymer of (a) propylene and ethylene, (b) propylene, ethylene and a CH2=CHR alpha-olefin (R = 2-8C alkyl), or (c) propylene and such an alpha-olefin wherein the copolymer contains 85-89 propylene and has an isotactic index of 80-98%; (2) 5-20 wt. % semi-crystalline, linear copolymer fraction having a crystallinity of 20-60% (by DSC), comprising (a) ethylene and propylene contg. over 55 wt. % ethylene, (b) ethylene, propylene and alpha-olefin contg. 1-10 wt. % alpha-olefin and 55-98 wt. % of both ethylene and alpha-olefin, or (c) ethylene and alpha-olefin, contg. 55-98 wt. % alpha-olefin, wherein the copolymer is insol. in xylene at room temp. and (3) 40-80 wt. % copolymer fraction comprising (a) ethylene and propylene contg. 20-40 wt. % ethylene, (b) ethylene, propylene and alpha-olefin contg. 1-10 wt. % alpha-olefin and 20-40 wt. % of both ethylene and alpha-olefin, or (c) ethylene and alpha-olefin contg. 20-40 wt. % alpha and opt. with 0.5-10 wt. % diene, wherein the copolymer fraction is soluble in xylene at room temp. and has an intrinsic viscosity of 1.7-3.0 dl/g and wherein the total amt. of (2) and (3) fractions, based on the total compsn. wt. is 65-80 wt. %, the wt. ratio of (2)/(3) is 0.1-0.3 and the total compsn. of ethylene and/or alpha-olefin in (2)+(3) is below 50 wt. %. and (B) comprises: (1) a partially crosslinked thermoplastic olefin elastomer compsn. comprising: (a) 50 pts. wt. thermoplastic elastomer comprising: (i) 30-70 wt. % propylene homopolymer having an isotactic index greater than 90, or a crystalline propylene copolymer with ethylene and/o 4-8C alpha-olefin, having a propylene content greater than 85 wt.% and an isotactic index greater than 85%, (ii) 30-70 wt.% amorphous ethylene-propylene or butene copolymer fraction, opt. contg. 1-10 wt. % diene, which is xylene soluble at room temp. and contains 30-70 wt. % ethylene; (iii) 10-30 wt. % semi-crystalline ethylene-propylene or butene copolymer which is xylene insol. at room temp. and contains above 90 wt. % ethylene; and (iv) 2-20 pts. wt. polybutene-1 based on 100 wt. pts. (i)+(ii)+(iii), wherein the ratio of polybutene:rubber is below 0.5; and (b) 55 pts. wt. olefin rubber compsn. comprising: (i) a homopolymer of propylene having an isotactic index greater than 90; and (ii) an ethylene-propylene copolymer rubber contg. 30-70 wt. % ethylene; and/or (2) an ethylene-propylene-conjugated diene terpolymer rubber having an ethylene content of 40-77 wt. % and a diene content of 2-10 wt. %.