Method for producing polymer alloy, polymer alloy, formed article, transparent formed article and optical film
CA 2463793 A1 · Owner: Nishimura, Youhei · Inventors: Tada, Toshio; Morita, Takeharu; Nishimura, Youhei
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for producing a polymer alloy which comprises a step (1) of admixing two or more types of resin being incompatible with one another and a solvent being liquid or solid at least at ordinary temperature under ordinary pressure, a step (2) of heating and pressurizing the solvent into a high temperature high pressure fluid or a supercritical fluid and mixing them at this state, and a step (3) of rapidly cooling the mixture formed in the step (2) to a temperature lower than the glass transition temperature of the resin without releasing the pressure; a polymer alloy produced by the method; and a formed article, a transparent formed article and an optical film comprising the …
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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
- Filed October 23, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 23, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 2024.
- 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.