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, 1996
Filed:
Mar. 03, 1994
Applicant:
Inventor:
Howard C Ng, Kingston, CA;
Assignee:
Du Pont Canada Inc., Mississauga, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528349 ; 528310 ; 528324 ; 5283291 ; 528335 ; 528336 ; 528338 ; 528339 ; 528340 ; 528347 ;
Abstract
A process for the manufacture of a partially aromatic polyamide is disclosed. The process comprises the polymerization stages of, in sequence, feeding to a reactor a slurry of at least one aromatic dicarboxylic acid and at least one aliphatic diamine, then with the incremental addition of water and in the presence of 0.05 to 2% by weight of a monocarboxylic acid, heating the slurry to a temperature of at least 270.degree. C. while maintaining a pressure of at least 1.2 MPa. The preferred dicarboxylic acid is 2,6 naphthalene dicarboxylic acid. The polyamides may be used in the manufacture of products using melt processing techniques.