Process for producing bisphenol compounds
CA 1307604 C · Owner: Sumitomo Chemical Co. Ltd. · Inventors: Yachigo, Shin-Ichi; Okamura, Haruki; Kaneoya, Tatsuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a butadiene polymer composition containing a bisphenol compound represented by the following formula:, wherein R5 represents alkyl group having 1 to 4 carbon atoms; R6 represents -C(CH3)2-R' (R' is alkyl group having 1 to 5 carbon atoms or phenyl group) or phenyl group; and R7 represents acrylate residue or methacrylate residue in an amount of 0.05 to, 2 parts by weight per 100 parts by weight of butadiene polymer. These compositions are quite stable to thermal deterioration and coloration in the absence of oxygen.
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 September 15, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 15, 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.