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
1988-05-19
1989-10-31
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...
524783, 525123, 525129, 525130, 528 745, 427136, 427138, 4273855, 4273881, 4284231, 4284255, C08L 7504
Patent
active
048778290
ABSTRACT:
Novel polyurethane formulations especially useful as membranes for the protection of bridge deckings. The polyurethane is prepared by mixing two components, A and B. Component A comprises castor oil, a low molecular weight polyol having a molecular wieght between 92 and about 200, preferably with an elastomer. Component B is a modified MDI, being either (i) a mix of 4,4'- and 2,4'-isomers of diphenylmethane diisocyanate or (ii) a diphenylmethane diisocyanate and its reaction product with a low molecular weight poly(oxyalkylene).
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