B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
154/108, 20/88
B32B 11/00 (2006.01)
Patent
CA 1140443
ABSTRACT OF THE DISCLOSURE Improved waterproofing membranes of the pressure-sensitive or self- adhesive bituminous type particularly useful in roofing and for waterproofing substrates in general are described. The membranes are in the form of pre-formed, flexible, sheet-like laminates of (a) a layer of waterproofing pressure-sensitive bituminous adhesive such as a rubberized asphalt composition, and, (b) a flexible support sheet having an adhesive-promoting coating on one or both surfaces to improve its bonding to the bituminous adhesive to which it is laminated and/or to the bituminous adhesive layer of a like overlapping waterproofing membrane. The adhesion-promoting coating contains a polymer having a plurality of pendant carboxylate groups from its backbone (e.g. an acrylic polymer such as polymethylmethacrylate, or a polymer of a vinyl ester such as polyvinylacetate). Adhesion between such coating and the bituminous adhesive is promoted by subjecting the contacting portions to elevated temperature. The membrane is preferably provided further with a layer of removable protective material such as siliconized "release" paper placed adjacent the adhesive layer in order that the membrane is able to be transported to the job site.
355413
Smart & Biggar
W.r. Grace & Co.,-Conn.
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