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:
Sep. 15, 1992
Filed:
Aug. 26, 1991
Kiyotake Morimoto, Koshigaya, JP;
Yasushi Takagi, Tokyo, JP;
Isao Kato, Tokyo, JP;
Masahiko Nakata, Tokyo, JP;
Nisshinbo Industries, Inc., Tokyo, JP;
Abstract
A method for producing a non-yellowing polyurethane urea foam, which comprises reacting an isocyanate-terminated prepolymer, obtained by the addition reaction of a polyol having a number average molecular weight of 100 to 5,000 and containing on the average 2 to 3 functional groups with an aliphatic polyisocyanate in an amount of 1.4 to 2.6 times the hydroxyl equivalent, with water in an amount of 0.4 to 5 times the isocyanate equivalent in the presence of, per 100 parts by weight of the prepolymer, 0.1 to 5 parts by weight of a carboxylic acid metal salt or 0.1 to 10 parts by weight of an amine-type catalyst.