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:
Sep. 22, 1998
Filed:
Dec. 16, 1996
Herbert Zeitler, Grossaitingen, DE;
Reimund Brecheler, Schwabmunchen, DE;
Hoechst Trevira GmbH & Co KG, , DE;
Abstract
A process for the production of hydrolysis resistant polyester fibers and filaments (preferably monofilaments for use in paper making machine sieves) comprises feeding a masterbatch of a polymeric carrier and an end group blocking agent to a spinneret together with a thread-forming polyester material, wherein the polymeric carrier has practically no end groups which react with the end group blocking agents. In addition to the process and the masterbatch, the polyester fibers or filaments of increased resistance to hydrolysis, in which the agents for blocking the end groups are distributed inhomogeneously over the cross-section of the monofilament, comprise a content of end group blocking agent that increases continuously from the core to the jacket of the fiber.