B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
154/104, 18/782
B32B 13/12 (2006.01) B32B 27/20 (2006.01) C09D 5/34 (2006.01) C09J 123/02 (2006.01) C09K 3/10 (2006.01)
Patent
CA 1246309
-1- SELF-HEALING BENTONITE SHEET MATERIAL COMPOSITE ARTICLE Abstract of the Disclosure The present invention relates to a layered water sealing article of manufacture including a layer of a flexible sheet material adhered to a layer of a composition comprising a non-hydrated water-swellable clay intimately contacted with a polypropene, polybu- tene, or mixtures thereof particularly useful as a water barrier. The water swellable clay composition can be adhered to the flexible sheet material in any manner, such as by extruding the composition in sheet form onto a layer of sheet material. The clay compo- sition layer is sufficiently tacky to adhere to the sheet material on one major surface, and is sufficient- ly tacky for adherence to a wall or conduit, floor or roof on an exposed major surface in areas of poten- tial water flow to prevent the seepage of water through the bentonite clay composition layer. In one embodi- ment, the clay composition layer includes a polypropene and/or a polybutene and an elastomer, such as butyl rubber, having sufficient resilience to stretch or expand with the expanding water-swellable clay compo- sition upon hydration and to aid in maintaining the structural integrity and cohesiveness of the clay composition. In another embodiment, the clay compo- sition layer comprises a water-swellable clay, an elastomer, and any plasticizer compatible with the elastomer.
479783
American Colloid Company
Smart & Biggar
LandOfFree
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