Method for producing p-alkylstyrene
CA 1283665 C · Owner: Tokumoto, Yuuichi · Inventors: Shimizu, Isoo; Tokumoto, Yuuichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for producing p-alkylstyrene which is characterized in that side reaction scarcely occurs catalyst, and unreacted material are easily recovered for the reuse the p-position selectivity is excellent and yield of aimed product is high. In the method, monoalkylbenzene having an alkyl group with 3 or more carbon atoms is reacted with acetaldehyde in the presence of hydrogen fluoride catalyst under the conditions of a temperature of 0°C or lower a molar ratio of 2 to 100 in "alkylbenzene/acetaldehyde" the other molar ratio of 1.7 to 300 in "hydrogen fluoride/acetaldehyde", the proportion of hydrogen fluoride to the sum of hydrogen fluoride and water in the reaction system of 65% by …
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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 April 30, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 30, 2008.
- 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.