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:
Jun. 23, 1992
Filed:
Mar. 07, 1990
Applicant:
Inventor:
Axel Vischer, Augsburg, DE;
Assignee:
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B28B / ; C08J / ;
U.S. Cl.
CPC ...
264 54 ; 264165 ; 521 79 ; 521 81 ; 521 92 ; 521 97 ; 521138 ; 521182 ;
Abstract
There is described a process for producing polyester foam fiber where sodium carbonate and citric acid are added as blowing agent before spinning together with polycarbonate. The proportion of blowing agent is from 0.15 to 0.80 percent by weight of the polyester and the proportion of polycarbonate is from 0.5 to 2 percent by weight of the polyester. The process of the invention makes it possible to produce foam fiber, i.e. filament or staple fiber with discontinuous voids, which may be used for example as carpet fiber and filling fiber for blankets and cushions or as a lining material for winter clothing.