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:
Mar. 26, 1991
Filed:
Jan. 08, 1990
Applicant:
Inventor:
Robert W Mason, Lake Charles, LA (US);
Assignee:
Olin Corporation, Cheshire, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C12P / ; C12P / ;
U.S. Cl.
CPC ...
435128 ; 435197 ; 435129 ;
Abstract
The present invention relates to a process for making an isocyanate which comprises the steps of: (a) reacting an amine with dimethyl carbonate in the presence of a hydrolase enzyme catalyst, preferably at a temperature not exceeding 50.degree. C. to form a methyl urethane, and (b) subjecting said methyl urethane to an elevated temperature in order to thermally cleave the urethane to produce an isocyanate.