Process for the preparation of a thermoplastically processable aromatic polyamide
CA 2028301 A1 · Owner: Finke, Jurgen · Inventors: Finke, Jurgen; Bartmann, Martin; Poll, Gunter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
23443-428, Abstract, A process for the preparation of thermoplastically processable aromatic polyamide by polycondensation of (A) HOOC-Ar-COOH and (B) H2N-Ar'-NH2, wherein Ar is for example, 1,3-, or 1,4-phenylene and Ar' is wherein X is -SO2- or -CO- and Y is -O- or -Sin the melt at, a temperature of from 200 to 400°C in the presence of a catalyst, and in a molar excess of component (A) relative to component (B). The polyamides so obtained have an improved resistance to thermooxidation and hydrolysis and are useful in moulding compositions.
Read the whole patent
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
- Filed October 23, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.