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:
May. 01, 1979
Filed:
Feb. 22, 1978
Applicant:
Inventor:
Warren J Rabourn, Deer Park, TX (US);
Assignee:
The Upjohn Company, Kalamazoo, MI (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ; C08G / ;
U.S. Cl.
CPC ...
2604 / ; 252182 ; 2604 / ; 521159 ; 528 52 ; 528 59 ; 560 26 ;
Abstract
The reactivity of polymethylene polyphenyl isocyanates containing 20 to 90 percent of methylenebis(phenyl isocyanates) is improved, and stabilized against a decline on storage, by incorporating therein very small amounts of a compound of the formula ##STR1## wherein R.sub.1 =alkyl, aryl; R.sub.2 =alkyl; R.sub.3 =H, alkyl or aralkyl; and R.sub.1 and R.sub.2 taken together represent the residue of an oxazoline or oxazine. 2-Ethyloxazoline is the preferred compound for incorporation in the polyisocyanate.