Patent ID: 6251995
Filing Date: 2001-06-26
Classification: C08J,C08L

Abstract:
Sheets, films or coatings of a high dimensional accuracy and a thermal shock stability and consisting primarily of polyolefins, the polyolefins consisting of modified polypropylenes or admixtures thereof with unmodified poypropylenes, the unmodified polypropylenes consisting of1) polypropylene polymers produced using Ziegler-Natta catalysts or metallocene catalysts and containing 4 to 18 carbon atoms and having a propylene content of 80.0 to 99.9% by weight, in the form of random copolymers, block copolymers and/or random block copolymers with melt indexes of 0.1 to 300 g/10 min at 230.degree. C./2.16 kg and/or2) a polyolefin mixture with an M.sub.w /M.sub.n ratio of 2 to 6 and a melt index of 1 to 40 g/10 min at 230.degree. C./2.16 kg, which consists of2.1) 60 to 98% by weight of a crystalline copolymer of 85 to 99.5% by weight of propylene and 15 to 0.5% by weight of ethylene and/or an .alpha.-olefin of the general formula CH.sub.2.dbd.CHR, in which R is a linear or branched alkyl group with 2 to 8 carbon atoms, and2.2) 40 to 2% by weight of an elastic copolymer of 20 to 70% by weight of ethylene and 80 to 30% by weight of propylene and/or an .alpha.-olefin of the general formula CH.sub.2.dbd.CHR, in which R is a linear or branched alkyl group with 2 to 8 carbon atoms, and/or3) largely amorphous polypropylenes or propylene copolymers with a crystalline polypropylene or crystalline propylene copolymer content of less than 10% by weight, an enthalpy of melting of less than 40 J/g and a melt index of 0.1 to 100 g/10 min at 230.degree. C./2.16 kg, the largely amorphous polypropylene being a homopolymer of propylene and/or a copolymer of propylene of at least 80 mole percent of propylene and not more than 20 mole percent of one or more .alpha.-olefins of the general formula CH.sub.2.dbd.CHR, in which R is a linear or branched alkyl group with 2 to 8 carbon atoms, and/or4) non-isotactic propylene homopolymers with a melting point of 145.degree. to 165.degree. C. and a melt viscosity of 200,000 cps at 190.degree. C., a heat of crystallization of 4 to 10 cal/g and a 35% by weight to 55% by weight solubility in diethyl ether, the modified polypropylenes having melt indexes of 0.1 to 50 g/10 min at 230.degree. C./2.16 kg and a ratio of the intrinsic viscosity of the modified polypropylene to the intrinsic viscosity of the unmodified polypropylene of largely the same weight average molecular weight of 0.20 to 0.95, and being produceda) by the treatment of propylene homopolymers and/or copolymers of propylene and ethylene or .alpha.-olefins with 4 to 18 carbon atoms or mixtures of said polypropylenes with multi-finctional ethylenically unsaturated monomers in the presence of ionizing radiation or of thermally decomposing free radical-forming agents orb) by the reaction of fnctionalized polypropylenes with multi-functional compounds of opposite reactivity, orc) by the hydrolytic condensation of polypropylenes containing hydrolyzable silane groups.