FIELD: process engineering.
SUBSTANCE: invention relates to multilayer microporous polyethylene membrane and storage battery made thereof. Proposed membrane has at least two microporous layers. One layer (a) of polyethylene resin A contains high-density polyethylene A with 0.2 and more end vinyl groups per 10 000 carbon atoms defined by IR-spectroscopy. Second microporous layer (b) of polyethylene resin B contains high-density polyethylene A with smaller than 0.2 end vinyl groups per 10 000 carbon atoms defined by IR-spectroscopy. Said membrane is produced by two methods. First method comprises simultaneous extrusion of solutions of polyethylene resins A and B through spinneret, cooling of extrudate, removing of solvent and laminating. Second method comprises extrusion of said solutions through different spinnerets. Said membrane is used to produce storage battery separator.
EFFECT: well-balanced characteristics of melting and cutting-off, good forming property of film and separator and anti-oxidation properties.
4 cl, 1 tbl, 3 ex
