Patent ID: 11933040
Assignee: GCP APPLIED TECHNOLOGIES INC.
Field: Surface technology, coating (Chemistry)
Classification: CPC E  B  C | IPC B  C  E

Claim 18:
19. A waterproofing membrane, comprising: a composite with removable release sheet, the membrane composite, when unrolled and with release sheet removed, having a total composite thickness in the range of 20 to 115 mils, the membrane composite comprising:
a) an outer continuous layer having total average thickness in the range of 2 mils to 20 mils, said outer continuous layer comprising polyolefin or thermoplastic polyurethane and having a partially or entirely embedded reinforcing fibrous or textile structure chosen from mesh, spun-bonded fiber, or random laid fiber, whereby the polymer fills in any voids or interstices within the reinforcing structure to prevent lateral water migration while the membrane is installed upon a building or civil engineering surface;
b) a pressure sensitive adhesive layer having total thickness in the range of 5 mils to 40 mils; and
c) a closed-cell foam layer having a total thickness in the range of 5 mils to 55 mils and being located intermediate between and attached to each of the outer continuous layer and the pressure sensitive adhesive layer, wherein the closed cell foam layer is made from a polymer which has a flexural modulus of less than 400,000 psi as measured in accordance with ASTM D 790; and
d) a removable release sheet for protecting the pressure sensitive adhesive layer on a face opposite the face to which it is attached to the closed-cell foam layer, the removable release sheet being removed from the laminate membrane during or after it is unrolled or positioned upon the substrate surface.