Water-swellable adhesive water stop
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United States of America Patent
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Mar 1, 1994
Issued Date -
N/A
app pub date -
Sep 3, 1991
filing date -
Jul 28, 1989
priority date (Note) -
Expired
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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.
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