Heat-resistant film and production process thereof
CA 1317430 C · Owner: Kureha Kagaku Kogyo K.K. · Inventors: Teramoto, Yoshikichi; Wakabayashi, Juichi; Mizuno, Toshiya
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed herein is a heat-resistant film obtained by biaxially-stretching a composition which comprises (A) 50-90 parts by weight of a polyetheretherketone having predominant recurring units of the formula:, and (B) 50-10 parts by weight of a substantially linear poly(arylene sulfide) having melt viscosity of at least 1,000 poises. A production process of such a heatresistant film is also disclosed, which comprises biaxially stretching the above composition in a temperature range at least equal to the crystallization temperature (Tc) of the poly(arylene sulfide) but not higher than the crystallization temperature (Tc) of the
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 May 11, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 11, 2010.
- 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.