Linear trimer of para-isopropenyl phenol and process for its preparation
CA 1097692 A · Owner: Mitsui Toatsu Chemicals, Inc. · Inventors: Morimoto, Yoshio; Yamazaki, Noboru; Takase, Tsutomu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel trimer of p-isopropenyl phenol of the structure, which is useful as a material or a curing agent for epoxy resins. The linear trimer includes a cis-isomer (m.p. 225.5 - 227°C) and a trans-isomer (m.p. 167 - 168°C). It is prepared by reacting p-isopropenyl phenol or its linear polymer in the presence of an acid catalyst such as sulfuric acid, boron fluoride or activated clay in an aromatic hydrocarbon, halogenated hydrocarbon substituted, aromatic hydrocarbon or aprotic polar solvent (e.g. benzene carbon tetrachloride, nitrobenzene or dioxane).
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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 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 17, 1998.
- 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.