Self-healing bentonite sheet material composite article

An article of manufacture comprising a first layer of a water-impermeable sheet of polymeric material adhered to a water-swellable clay composition second layer, wherein the second layer has essentially no silicic filler and comprises a water-swellable clay in an amount of 35% to 90% by weight of the second layer, an elastomer in an amount of 1% to 20% by weight of the second layer, and a plasticizer capable of extending said elastomer in an amount of 2% to 50% by weight of the second layer.

A generally flat, multi-layered article in sheet form suitable for adhering to a surface of a substrate for water seepage control comprising a first layer of sheet or web material and a second layer including water-swellable clay in an amount of 35 to 90% by weight of the second layer;

• an elastomer in an amount of 1% to 20% by weight of the second layer;
• and polypropene, polybutene or mixtures thereof in an amount of 10% to 65% by weight of the second layer said second layer having essentially no silicic filler.

A shaped, water-expandable article of manufacture having essentially no silicic filler comprising a first layer of a water-impermeable, flexible sheet of polymeric material adhered to a second layer, the second layer comprising a water-swellable clay in an amount of 35% to 90% by weight of the second layer, an elastomer in an amount of 1% to 20% by weight of the second layer, and a plasticizer capable of extending said elastomer in an amount of 2% to 50% by weight of the second layer.

A multi-layer article of manufacture comprising a first layer of flexible sheet or web material and a second layer having essentially no silicic filler material, adhered to said first layer, including 35-90% by weight water-swellable clay, 1-20% by weight of an elastomer having at least 100% elongation, and 2-50% of a plasticizer compatible with said elastomer.

A multi-layer article of manufacture comprising a first layer of flexible sheet or web material and a second layer having essentially no silicic filler material, adhered to said first layer, consisting essentially of a water-swellable clay in an amount of 35% to 90% by weight, an elastomer in an amount of 1% to 20% by weight, and a plasticizer capable of extending said elastomer in an amount of 2% to 50% by weight of the composition.

A multi-layer article of manufacture comprising a first layer of flexible sheet or web material and a second layer, adhered to said first layer, consisting essentially of a water-swellable clay in an amount of 35% to 90% by weight, an elastomer in an amount of 1% to 20% by weight, and polypropene, polybutene or mixtures thereof in an amount of 2% to 50% by weight of the second layer.

A multi-layer article of manufacture comprising a first layer of flexible sheet or web material;

• and a second layer, adhered to said first layer, comprising a water-swellable clay in an amount of 35% to 90% by weight;
• polypropene, polybutene or mixtures thereof in an amount of 10% to 65% by weight;
• and having 0 to 1% by weight of a silicic filler material.

A method of manufacturing a multi-layer article comprising:

• intimately contacting a water-swellable clay with polypropene, polybutene, or a mixture thereof to form a clay composition including 35% to 90% by weight clay, and 10% to 65% polypropene, polybutene or mixture thereof, and having essentially no silicic filler material, to form a water-swellable clay composition;
• forming the water-swellable clay composition in sheet form;
• and contacting the water-swellable clay composition sheet material against a flexible sheet material to adhere the flexible sheet material thereto to form the multi-layer article.