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:
Dec. 29, 1987
Filed:
Sep. 30, 1986
Applicant:
Inventors:
Reinoud J Gaymans, 7548 PX Boekelo, NL;
Antonius J Bongers, 6124 AG Papenhoven-Born, NL;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528335 ;
Abstract
A process is disclosed for the preparation of polytetramethylene adipamide by heating in a first reaction zone, the salt of 1,4-diaminobutane and adipic acid, with from 0-25 wt. % of other polymide-forming compounds, at a pressure between 5 and 100 bars to form a prepolymer, then passing the prepolymer containing liquid reaction mixture to a second reaction zone wherein the temperature of the liquid reaction mixture is maintained above its solidification point while the pressure is simultaneously reduced, then subjecting the prepolymer containing liquid reaction mixture to after-condensation in at least one subsequent reaction zone.