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
1988-11-25
1990-01-16
Welsh, Maurice J.
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...
2521822, 4284255, C08L 7504
Patent
active
048944050
ABSTRACT:
A concrete and masonry waterproofing composition comprises a major amount of a polyurethane and a minor amount of a penetrant. The polyurethane is desirably made from a polyether polyol or a polyester polyol intermediate, wherein the polyol is a diol or a triol. Such intermediates are reacted with a polyisocyanate. Cure, that is, chain extension occurs upon contact with moisture in the air. The penetrant is an organosilane having the formula: ##STR1## where R.sup.1 is an aliphatic having from 1 to 18 carbon atoms and wherein R.sup.2, R.sup.3, and R.sup.4, independently, is an alkyl having from 1 to 6 carbon atoms, or an organosiloxane having the formula: ##STR2## wherein R.sup.7 is an aliphatic having from 1 to 18 carbon atoms and R.sup.5 and R.sup.6, independently, is an alkyl having from 1 to 6 carbon atoms, and wherein n is 2 to 20. Improved results are obtained when the composition is applied to masonry or concrete in that water absorption is much lower than that obtained with either solely a polyurethane coating or solely a penetrant, and application ease is improved in that a single coating is used to both penetrate and seal.
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Hudak Daniel J.
Lindsay James R.
Shust Nestor W.
Tremco Incorporated
Welsh Maurice J.
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