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...
Patent
1995-02-15
1997-09-02
Michl, Paul R.
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...
524445, 525 98, C08J 510, C08K 334, C08L 5302
Patent
active
056632304
ABSTRACT:
Water stop compositions and methods of preparing same are disclosed. The compositions exhibit a controlled swelling or volumetric expansion upon immersion in water. The compositions swell about 5-8% after 1 day's immersion and about 35-65% after 28 day's immersion. A blend of fast acting sodium bentonite clay and a slower acting calcium bentonite clay contribute to this desirable controlled expansion along with a specific combination of thermoplastic elastomer, cross-linked butyl rubber components and polyisobutylene. Another important factor in providing the desired expansion is a thorough mixing step to ensure product homogeneity whereby mix components are blended in a Sigma mixer for an excess period of time after all components have been added to the mixer.
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Concrete Sealants, Inc.
Michl Paul R.
Rajguru U. K.
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