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:
Nov. 06, 2018
Filed:
Oct. 23, 2017
Deutsche Institute Für Textilund Faserforschung Denkendorf, Denkendorf, DE;
Rainer Gutmann, Ostfildern, DE;
Sabine Gneiting, Oberboihingen, DE;
DEUTSCHE INSTITUTE FUR TEXTILUND FASERFORSCHUNG DENKENDORF, Denkendorf, DE;
Abstract
The invention relates to a flame-resistant polyamide as a product of the condensation of dicarboxylic acids with diamines and with a flame-retardant phosphorus compound, which flame-resistant polyamide is characterized in that the flame-resistant polyamide FR contains, in the main chain thereof phosphinic acid amide structural units of formula (II) —PO(R)—NH— (II) in addition to the amide structural units of formula (I) CO—NH— (I), in which formula (II) RI means hydrogen or an organic group and can differ in the individual phosphinic acid amide structural units within the main chain and that the polyamide FR achieves a relative viscosity, measured as a 1% solution in 96% sulfuric acid at 25° C., of at least 2.0 (in accordance with DIN 51562). The invention further relates to a method for producing said flame-resistant polyamide FR. In said method, one or more diamines are polycondensed with one or more dicarboxylic acids under pressure and at elevated temperature in the presence of water and with one or more diphosphinic acids and/or one or more phosphino-carboxylic acids by means of a polyamide synthesis. After the polycondensation, the pressure in the reaction chamber is reduced to less than 1 bar. The flame-resistant polyamide can be advantageously used to produce molded bodies, in particular films, components, and filaments or filament yarns.