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. 25, 1994
Filed:
Dec. 15, 1993
Applicant:
Inventors:
Masato Shimizu, Amagasaki, JP;
Toshiaki Nakano, Amagasaki, JP;
Assignee:
Sumitomo Bayer Urethane Co. Ltd., Amagasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07D / ;
U.S. Cl.
CPC ...
560332 ; 560330 ; 560331 ; 546222 ;
Abstract
A method for preventing the coloration of a diphenylmethane diisocyanate compound, which comprises adding, to the diphenylmethane diisocyanate compound, a hindered amine compound of the formula: ##STR1## wherein R.sup.1 and R.sup.3 are, the same or different, each a hydrogen atom or a C.sub.1 -C.sub.8 hydrocarbon group,