Process for treating a polymer slurry
CA 1251888 A · Owner: Kureha Kagaku Kogyo Kabushiki Kaisha · Inventors: Iwasaki, Takao; Okamoto, Tsuneo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for treating a polyarylene sulfide polymer slurry which has been provided by reactions of an alkali sulfide and a dichloroaromatic compound in Nmethylpyrrolidone, the process comprising the following steps of (i) through (iv): (i) a step of separating a polymer slurry which contains polyarylene sulfide particles, alkali chloride as a by-product in the form of crystals and a solution and an arylene sulfide oligomer and has a liquid component which is principally Nmethylpyrrolidone into polyarylene sulfide particles and a slurry containing the crystalline alkali chloride the, oligomer, and unreacted organic material by screening the slurry without diluting with water; (ii) a step of …
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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 March 28, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 28, 2006.
- 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
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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.