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. 12, 1978
Filed:
Jan. 14, 1977
Applicant:
Inventors:
Richard D Chapman, Pensacola, FL (US);
Donald A Holmer, Pensacola, FL (US);
George A Mortimer, Pensacola, FL (US);
Assignee:
Monsanto Company, St. Louis, MO (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528313 ; 528338 ; 528339 ; 528324 ; 528336 ;
Abstract
An improvement in the process for preparing random copolyamides by the melt polymerization of a mixture of hexamethylenediammonium terephthalate and hexamethylenediammonium isophthalate is described. The improvement comprises accomplishing the melt polymerization in the presence of a small amount of a certain phosphorus compound, such as benzene phosphinic acid, whereby ammonia formation during polymerization is reduced.