Moisture barrier membrane with tearable release liner composite
AssigneeW. R. Grace & Co.-Conn.
InventorsJyoti Seth, John Abrahamson, James Hansen, Carmen Melillo
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Abstract
An exemplary moisture barrier membrane 10 comprises a waterproof adhesive layer, (14) a carrier support, (12) and a release liner (16) composite having a paper sheet, (20) cutting strings, (22) a polyolefin (24) coating or film for holding the strings against the paper and apart from the waterproof adhesive layer, and a release agent (26) such as silicone or wax over the polyolefin coating or film. This construction allows for relatively thin paper and strings to be used, such that tear resistance is conferred upon the release liner composite as a whole.
Claims15
A moisture barrier, comprising:
- a waterproofing adhesive layer having a first major side contiguous with a carrier support sheet and having a second major side to which is releasably attached a release liner composite that is generally coextensive with said waterproofing adhesive layer, said release liner composite comprising:
- a paper sheet having longitudinally extending edges which are not folded;
- a plurality of strings arranged in spaced apart relation to each other and operative to cut the paper sheet when one of the strings is pulled through the paper;
- and
- a continuous polyolefin coating or film positioned between said waterproofing adhesive layer and said plurality of strings, said continuous polyolefin coating or film being bonded with said paper sheet and operative to maintain said strings in spaced apart relation adjacent said paper sheet;
- said release liner composite further comprising a release coating positioned between said waterproofing adhesive layer and said continuous polyolefin coating or film, said release coating operative to provide releasable-adhesion between said release liner composite and said waterproofing adhesive layer;
- and
- said waterproofing adhesive layer is wider than said carrier support sheet such that the membrane has exposed adhesive “edge-beads” extending beyond at least one edge of said carrier support sheet when installed on a building surface.
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Dependencies are inferred from the claim text.