Patent ID: 9562174
Date: 2017-02-07
CPC Classifications: B32B,C09J,E04B,E04D,Y10T

Claim:
1. A self-adhesive construction membrane sheet comprising a continuous layer of an air and water vapour permeable pressure sensitive adhesive attached to one surface of a permeable membrane sheet, wherein the permeable membrane sheet is: a water vapour permeable air barrier laminated construction membrane comprising three layers: a spunbond polypropylene layer, a microporous polypropylene film layer and a spunbond polypropylene layer, wherein the adhesive mixture used to form the continuous layer of an air and water vapour permeable pressure sensitive adhesive comprises, before drying or curing: an acrylic pressure sensitive adhesive as base compound; an air permeable agent; a cross-linking agent; and polypropylene glycol; so as to provide, after drying or curing, the continuous layer of air and water vapour permeable pressure sensitive adhesive having tortuous air permeable paths therethrough.