The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 31, 1989
Filed:
May. 19, 1988
Applicant:
Inventors:
Cung Vu, Gaithersburg, MD (US);
Timothy J Martin, Loxwood, GB;
Andrew M Gillanders, Finchampstead, GB;
Bassam Sbaiti, Burnham, GB;
Assignee:
W. R. Grace & Co.-Conn., Columbia, MD (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C08L / ;
U.S. Cl.
CPC ...
524729 ; 524783 ; 525123 ; 525129 ; 525130 ; 528 745 ; 427136 ; 427138 ; 4273855 ; 4273881 ; 4284231 ; 4284255 ;
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).