| 摘要 |
<p>Textile laminate with a water vapor permeability of more than 1000 (preferably more than 1800) g/m <2> per 24 hours and a water tightness corresponding to a water column of more than 500 mm (preferably more than 750) mm comprises: (A) a sheet of woven, knitted or nonwoven fabric based on polyethylene, polypropylene, polyethylene terephthalate, polyamide, cellulose or cotton; (B) a film or extruded coating with a thickness of 3-200 (preferably 5-70) mu m based on polypropylene and containing 0.01-2.5 wt.% stabilizers, 0.01-1 wt.% processing aids and optionally 0.1-1 wt.% antistatic, 0.2-3 wt.% pigments, 2-20 wt.% flame retardants and/or 0.05-1 wt.% nucleating agents and/or 10-70 (preferably 20-50) wt.% (in)organic fillers and/or reinforcers; and optionally (C) an adhesive layer between (A) and (B), having a thickness of 0.5-20 (preferably 1-10) mu m and comprising a polar olefin polymer and/or an olefin graft copolymer, e.g. a copolymer of ethylene with vinyl acetate or (meth)acrylic acid or polyethylene or polypropylene grafted with an unsaturated carboxylic acid or anhydride. The film or extruded coating is based on either: (1) a polymer blend comprising (a) 1-50 (preferably 5-30) wt.% of a modified propylene polymer with a melt flow index of 0.1-50 (preferably 1-40) g/10 minutes at 230 degrees C and 2.16 kg, where the ratio of the limiting viscosity of the modified polypropylene to that of an unmodified polypropylene with approximately the same molecular weight is 0.2-0.95; and (b) 50-99 (preferably 70-95) wt.% of a polymer selected from (i) propylene homopolymers and/or copolymers (statistical and/or block copolymers) with ethylene and/or 4-18C alpha -olefins, with a propylene content of 80-99.9 wt.%, preferably producing using Ziegler-Natta or metallocene catalysts, with a melt flow index of 0.1-300 (preferably 1-150) g/10 minutes at 230 degrees C and 2.16 kg; and/or (ii) polyolefin mixtures with a Mn/Mw ratio of 2-6 and a melt flow index of 1-40 g/10 minutes at 230 degrees C and 2.16 kg, comprising 60-98 wt.% of a crystalline copolymer of 85-99.5 wt.% propylene and 0.5-15 wt.% ethylene or 4-10C alpha -olefin and 2-40 wt.% of an elastic copolymer of 20-70 wt.% ethylene and 30-80 wt.% propylene and/or 4-10C alpha -olefin; and/or (iii) amorphous propylene (co)polymers that contain less than 10 wt.% crystalline phase, have an enthalpy of melting below 40 J/g, have a melt flow index of 0.1-100 g/10 minutes at 230 degrees C and 2.16 kg and comprise at least 80 mole % propylene and no more than 20 mole % 4-10C alpha -olefin; and/or (iv) non-isotactic polypropylene having a melting point of 145-165 degrees C, a melt viscosity of more than 200,000 cP at 190 degrees C, a heat of crystallization of 4-10 cal/g and an ether soluble content of 35-55 wt.%; or (2) a polymer blend comprising only the components of (b), comprising 0-95 wt.% (i) and 5-100 wt.% (ii)+(iii)+(iv).</p> |
