Cold-resistant, gas-tight laminated membrane - has polyvinyl-alcohol layer contg. poly:ol plasticiser and laminated on at least one side with layer of rubber

摘要

A cold-resistant, gas-impermeable, laminated, 2-dimensional body (I) is claimed, contg. a PV-alcohol resin layer (PVAL layer A) contg. 15-50 wt.% polyol plasticiser (II), with a rubber layer (B) laminated on at least one side. Pref. a vapour- and plasticiser-impermeable resin layer (C) is laminated between (A) and (B) and, pref., a metal coating (D) is laminated onto the side of (C) which faces towards (A); (A) consists of partly or completely hydrolysed PVAC or hydrolysed EVA copolymer; (II) is glycerol, ethylene glycol or propylene glycol, and (I) contains 20-40 wt.% (II); (B) consists of nitrile, butyl, chloroprene, or styrene rubber; layer thicknesses are 50-20000 (pref. 300-1500) microns (A), 0.2-2 mm (B) and 5-50 microns (C); (C) consists of PE, PP, PVF, PVDF, TFE/HFP copolymer, or unplasticised, hydrolysed EVA copolymer, pref. a fluoro-resin or PVAL; (D) is a layer of Al; rubber and resin layers are laminated by vulcanising, using an adhesive formulation (III) which is vulcanisable with rubber; (C) is laminated after corona discharge treatment on both sides; (A) is bonded with an isocyanate adhesive. USE/ADVANTAGES - (I) is useful for the prodn. of membranes for use in storage elements (e.g. contg. brake fluid).