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:
May. 04, 1993
Filed:
Dec. 13, 1990
Paul Antikow, Lyons, FR;
Francois Pinaud, Brignais, FR;
Rhone Poulenc Fibres, Lyons, FR;
Abstract
Process for improving the production efficiency of the spinning of an undrawn, preoriented yarn based on polyethylene terephthalate (PET) by the introduction, before the spinning, of 0.03 to 0.1% by weight of fumed silica with a particle size of between 5 and 15 nm into the molten polymer in the form of dispersion in a masterbatch of the same polymer as that to be processed, then spinning the PET containing the silica in the finely dispersed state, the filaments being next cooled by means of a gas stream at temperature between 17.degree. to 22.degree. C. and then sized and wound at a velocity of between 3500 and 5000 m/min. The gain in production efficiency, evaluated in relation to the shrinkage of the filaments in dry air at 180.degree. C., is at least 7%, generally at least 10-15%.