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. 09, 1997
Filed:
Jun. 10, 1996
Applicant:
Inventor:
Salih Mumcu, Marl, DE;
Assignee:
Huels Aktiengesellschaft, Marl, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528318 ; 528310 ; 528315 ; 528323 ; 528326 ; 4284744 ;
Abstract
A process for the batch preparation of polylaurolactam in the melt, involving introducing molten, anhydrous laurolactam at a temperature of up to 280.degree. C. into a pressure-resistant reactor heated externally to a maximum of 290.degree. C.; introducing steam having a temperature in the range from 170.degree. to 280.degree. C. and a pressure in the range from 8 to 64 bar into the laurolactam until the laurolactam is heated under pressure to a temperature in a range from 280.degree. to 290.degree. C., to give a ring opened precondensed product; and, if desired, after release of pressure, polycondensing the ring opened precondensed product.