C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
400/106, 402/142
C08G 18/65 (2006.01) C08G 18/32 (2006.01) C08G 18/14 (1980.01)
Patent
CA 1176790
Abstract of the Disclosure A process for preparing molded polyurethane- polyurea elastomers comprising reacting an organic polyiso- cyanate and a reactive polyol composition, said reactive polyol composition comprising (a) a polyol having an equivalent weight of from 700 to 4,000 and a functionality from 2 to 6; and (b) a reactive aromatic diamine which is soluble in said polyol at use temperatures and concentrations, has a pKb value greater than 10, and has the following structural formula: Image wherein R1, R2, R3, and R4 individually are radicals selected from the group consisting of hydrogen and alkyl radicals of 1 to 4 carbon atoms, and at least one of the alkyl radicals in each ring is a non-linear alkyl radical selected from the group consisting of iso- propyl, isobutyl, and tertiary butyl radicals, and wherein R5 and R6 are radicals in- dividually selected from the group consisting of hydrogen and alkyl radicals of 1 to 4 carbon atoms. The process is preferably carried out by means of reaction injection molding techniques. The process of this invention can be used to prepare large molded parts for automobiles such as facia, bumpers, hoods, doors, and fenders.
387265
Patton John T. Jr.
Rupert John P.
Basf Wyandotte Corporation
Robic Robic & Associes/associates
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