Water-swellable adhesive water stop

Details Water-swellable adhesive water stop Water-swellable adhesive water stop

1991-09-03

1994-03-01

Bleutge, John C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524433, 524447, 524574, 524503, 524442, C08K 326

Patent

active

052908445

ABSTRACT:
The water-swellable adhesive water stop of the invention is advantageous in respect of the improved workability and high water-stopping power as a consequence of the unique formulation of the rubber composition from which the water stop is prepared by shaping and vulcanization. The rubber composition comprises: (A) a butyl rubber; (B) a highly water-absorptive resin; (C) an inorganic water-absorbent; (D) a tackifier; (E) a plasticizer; (F) a vulcanizing agent; and, optionally, (G) a basic filler each in a limited amount relative to the component (A). The water stop is further characterized by a tensile strength in the range from 1 to 30 kgf/cm.sup.2, 100% elastic modulus in the range from 1 to 4 kgf/cm.sup.2, ultimate elongation at break of at least 300% and degree of swelling in water in the range from 150 to 500% by weight after immersion in water for 21 days at 23.degree. C.

REFERENCES:
patent: 4366284 (1982-12-01), Ishida et al.
patent: 4590227 (1986-05-01), Nakamura et al.
patent: 4740404 (1988-04-01), Otsuga et al.
patent: 5075373 (1991-12-01), Takemori et al.

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