Self-healing bentonite sheet material composite article

• US 4,810,573 A
• Filed: 07/20/1987
• Issued: 03/07/1989
• Est. Priority Date: 11/29/1984
• Status: Expired due to Term

• Current Assignee: Amcol International Corporation (Minerals Technologies Incorporated)
• Original Assignee: American Colloid Company (Minerals Technologies Incorporated)
• Inventors: Harriett, Todd D.
• Primary Examiner(s): Ives, P. C.
• Application Number:
  US07/075,567
• Time in Patent Office: 596 Days
• Field of Search: 428/331, 428/454, 428/497, 428/521, 428/517, 428/518
• US Class Current: 428/331
• CPC Class Codes: B32B 19/02 the layer of fibres or particles being impregnated or embedded in a plastic substance
• CPC Class Codes: B32B 27/20 using fillers, pigments, thixotroping agents
• CPC Class Codes: B32B 27/22 using plasticisers
• CPC Class Codes: C08L 2666/54 Inorganic substances
• CPC Class Codes: C09D 5/34 Filling pastes materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12
• CPC Class Codes: C09J 123/02 not modified by chemical after-treatment
• CPC Class Codes: Y10T 428/259 Silicic material
• CPC Class Codes: Y10T 428/31844 Of natural gum, rosin, natural oil or lac
• CPC Class Codes: Y10T 428/31917 Next to polyene polymer
• CPC Class Codes: Y10T 428/3192 Next to vinyl or vinylidene chloride polymer
• CPC Class Codes: Y10T 428/31931 Polyene monomer-containing

Abstract

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, polybutene, 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 composition layer is sufficiently tacky to adhere to the sheet material on one major surface, and is sufficiently tacky for adherence to a wall, conduit, floor, roof, or other structure to be protected from water contact, on an exposed major surface in areas of potential water flow to prevent the seepage of water through the bentonite clay composition layer. In one embodiment, 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 composition upon hydration and to aid in maintaining the structural integrity and cohesiveness of the clay composition. In another embodiment, the clay composition layer comprises a water-swellable clay, an elastomer, and any plasticizer compatible with the elastomer.

Claims

1. 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, 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.

2. The article of claim 1 wherein said elastomer is partially cross-linked butyl rubber and said plasticizer is included in an amount of 10-30% by weight.

3. The article of claim 1 wherein said plasticizer is selected from the group consisting of epoxidized oils;

alkyl monoesters;

long chain (8-20 carbon) alkyl diesters;

aromatic- napthenic oils;

napthenic-aromatic oils;

napthenic-paraffinic oils; and

paraffinic oils.

4. 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 essenially 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.