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:
Jan. 11, 2000
Filed:
Mar. 11, 1997
Dudley J Primeaux, II, Elgin, TX (US);
Robert L Zimmerman, Austin, TX (US);
Kenneth M Hillman, Georgetown, TX (US);
Huntsman Petrochemical Corporation, Austin, TX (US);
Abstract
This invention concerns a method for the preparation of polyurea elastomers, comprising: (a) reacting an amine chain extender with dialkyl maleate to form an aspartic ester, wherein the chain extender has a molar amount of amine groups that is less than the moles of dialkyl maleate; (b) blending the aspartic ester with one or more polyoxyalkyleneamines to prepare a resin blend; (c) contacting the resin blend with an isocyanate under conditions effective to form a polyurea elastomer. This invention also concerns a a polyurea elastomer, comprising the reaction product of (a) a resin blend containing one or more polyoxyalkyleneamine and an aspartic ester and (b) an isocyanate, wherein the aspartic ester in the resin blend comprises a reaction product of an amine chain extender and a dialkyl maleate, wherein the mole ratio of amine functionality in the amine chain extender to dialkyl maleate or fumarate is greater than 1:1.