Shaped structures in aromatic copolyamides, and process for their preparation
CA 1269482 C · Owner: Keil, Gunter · Inventors: Herold, Friedrich; Jakob, Franz; Keil, Gunter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the disclosure The invention relates to filaments, fibers pulps, films, and sheets from a copolyamide which has at least the recurring structural units of the formulae A - OC - Ar - CO -, B - NH - AR' - NH - C, D, and in which the diamine components B C and D relative, to the total amount of diamine components in mol-% are within a predetermined domain. Such copolyamides can be produced from the corresponding diamines and dicarbonyl dichlorides in aprotic solvents in the presence or absence of metal halides of the first or second group of the periodic table. The spinning solutions obtainable therein can be processed in conventional manner into the claimed shaped structures.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted May 22, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 22, 2007.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.