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. 22, 1977
Filed:
Sep. 30, 1974
Applicant:
Inventors:
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D01D / ;
U.S. Cl.
CPC ...
264168 ; 264171 ; 2642 / ; 264206 ;
Abstract
The invention relates to a process for the production of spontaneously crimping composite fibres of acrylonitrile polymers wherein the dry-spun-filaments which still contain solvent are stretched to at least three times their original length in a bath of hot water which contains from 12 to 30 % by weight of dimethyl formamide. The stretching operation may be carried out in one or two stages.