Patent ID: 6235658
Filing Date: 2001-05-22
Classification: B32B,C08L,D04H,Y10T

Abstract:
Composites with a textile character with a water vapor permeability greater than 1,000 g/m.sup.2 /24 h and a waterproofness in excess of 500 mm of water column, comprising A) textile fabrics, B) a film coating and/or an extrusion coating and optionally C) an intermediate layer of bonding agent between the textile fabric and the film coating and/or extrusion coatingA) the textile fabrics representing woven, knitted or nonwoven fabrics based on polyethylene, polypropylenes, polyethylene terephthalate, polyamide, cellulose or cotton,B) the film coatings and/or extrusion coatings having a thickness of 3 to 200 .mu.m and consisting of polypropylenes with the addition of 0.01 to 2.5% by weight of stabilizers, 0.01 to 1% by weight of processing aids, in each case based on the sum of the polypropylenes, and optionally 0.1 to 1% by weight of antistats, 0.2 to 3% by weight of pigments, 2 to 20% by weight of flame retardants and/or 0.05 to 1% by weight of nucleating agents, in each case based on the sum of the polypropylenes, as auxiliary materials, and/or 10 to 70% by weight, based on the sum of the polypropylenes, of inorganic and/or organic fillers and/or reinforcing materials, andC) the intermediate layer of bonding agent between the textile fabric and the film coating and/or extrusion coating having a thickness of 0.5 to 20 .mu.m and consisting of polar olefin copolymers and/or olefin grafted copolymers, such as EVA copolymers, ethylene/acrylic acid copolymers, ethylene/methyl acrylate copolymers or polyethylene or polypropylenes grafted with unsaturated carboxylic acids or carboxylic acid anhydrides,wherein the polypropylenes of the film coatings and/or extrusion coatings B) either are polypropylene mixtures, which consist on the one hand ofB1) 1 to 50% by weight of modified propylene polymers with 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 polypropylenes with largely the same weight average molecular weight of 0.20 to 0.95, and, on the other, ofB2) 50 to 99% by weight ofb2.1) propylene polymers prepared using Ziegler-Natta catalysts or metallocene catalysts, and/or copolymers of propylene, ethylene and/or .alpha.-olefins with 4 to 18 carbon atoms with 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/orb2.2) 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 ofb2.2.1) 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, R being a linear or branched alkyl group with 2 to 8 carbon atoms, andb2.2.2) 2 to 40% 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, R being a linear or branched alkyl group with 2 to 8 carbon atoms, and/orb2.3) largely amorphous polypropylenes or propylene copolymers with a proportion of crystalline polypropylene or crystalline propylene copolymer 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 at most 20 mole percent of one or more .alpha.-olefins of the general formula CH.sub.2.dbd.CHR, wherein R is a linear or branched alkyl group with 2 to 8 carbon atoms, and/orb2.4) non-isotactic propylene homopolymers with a melt index of 1450 to 165.degree. C., a melt viscosity in excess of 200,000 cps at 190.degree. C., a heat of crystallization of 4 to 10 cal/g and a portion, soluble in diethyl ether, of 35% by weight to 55% by weight,or polypropylene mixtures, which consist only of B2), the components b2.2), b2.3) and b2.4) individually being contained in amounts of 5 to 100% by weight and the remaining components, individually or as a whole in the mixture, being contained in an amount up to 95% by weight.