Process for producing a polyarylene sulfide
CA 1281487 C · Owner: Inoue, Hiroshi · Inventors: Emura, Noriaki; Kato, Toshikazu; Inoue, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyarylene sulfide having a high molecular weight a high purity, excellent color tone and excellent heat stability is produced by carrying out a polymerization reaction between a dihalogenated aromatic compound and a sulfur source in an organic amide solvent and in the presence of an alkali metal salt of pyridine-carboxylic acid. Such a polyarylene sulfide is very useful for utilization in electronic components, automotive parts, etc.
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
- Granted March 12, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 12, 2008.
- 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.