Highly stereoregular poly(p-methylstyrene)s
CA 1296134 C · Owner: Kato, Masayuki · Inventors: Taguchi, Yoshio; Kato, Masayuki; Imai, Chihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Highly stereoregular poly(p-methylstyrene)s ABSTRACT OF THE DISCLOSURE, Poly(p-methylstyrene)s having more excellent properties, in particular, higher heat resistance are provided which has an isotactic pentad fraction of at least 70 %. The poly(p-methylstyrene)s can be prepared by polymerizing p-methylstyrene in the presence of a catalyst consisting of an activated titanium trichloride composition of titanium trichloride-aluminum halide compound-ether and a trialkylaluminum.
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 February 18, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 18, 2009.
- 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.