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:
Oct. 15, 2024
Filed:
Oct. 25, 2018
Lenzing Ag, Lenzing, AT;
Heinrich Firgo, Vöcklabruck, AT;
Clemens Bisjak, Seewalchen, AT;
LENZING AKTIENGESELLSCHAFT, Lenzing, AT;
Abstract
A process for the production of an oxidized polymer from a tetrakis hydroxyalkyl phosphonium compound comprising NHor at least one nitrogen compound comprising at least one NHor at least two NH groups, or NH, comprising the steps of: (a) reacting at least one tetrakis hydroxyalkyl phosphonium compound with NHor at least one nitrogen compound in order to obtain a precondensate, wherein the molar ratio of the tetrakis hydroxyakyl phosphonium compound to the nitrogen compound is in the range of 1: (0.05 to 2.0), preferably in the range of 1: (0.5 to 1.5), particularly preferably in the range of 1: (0,65 to 1.2), (b) crosslinking the precondensate obtained in process step (a) with the aid of ammonia to form a crosslinked polymer, (c) oxidizing the crosslinked polymer obtained in step (b) by adding an oxidizing agent to the oxidized polymer, wherein, in step (b), the precondensate from step (a) and the ammonia are each injected by means of a nozzle into a reactor space enclosed by a reactor housing onto a common collision point.