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US 4,859,735 AGranted
Castor oil based polyurethane for bridge deckings and related applications
AssigneeW. R. Grace & Co.-Conn.
InventorCung Vu
Life of this patent
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Abstract
Novel polyurethane formulations especially useful as membranes of the protection of bridge deckings. The polyurethane is prepared by mixing two components, A and B. Component A comprises castor oil modified with a ketone-formaldehyde condensate and also preferably contains an elastomer. Component B is a modified MDI, being a mixture of diphenylmethane diisocyanate and its reaction product with a low molecular weight poly(oxyalkylene).
Claims40
Composition consisting essentially of two separate components, A and B, wherein in parts by weight
- Component A consists essentially of (i) about 90-140 parts ketone-formaldehyde modified castor oil and (ii) about 0-120 parts elastomer;
- and
- Component B consists essentially of about 50-75 parts a mixture comprising diphenylmethane diisocyanate and the reaction product of diphenylmethane diisocyanate (MDI) with an alkylene oxide of 2-4 carbons.
Dependencies are inferred from the claim text.