Preparation of boron trichloride
CA 1112019 A · Owner: Ppg Industries, Inc. · Inventors: Crano, John C.; De Lue, Norman R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Boron trichloride is prepared in substantially stoichiometric quantities by free-radical chlorination of borate ester e.g. trimethyl, borate, at temperatures of between about 20C. and 100C. more preferably between about 40C. and about 90C. The mole ratio of chlorine to borate ester is from about 5.5:1 to about 7.5:1. Reactor pressures are moderate e.g. generally less than 3 atmospheres absolute. Atmospheric pressure can be used. An inert liquid organic solvent e.g. carbon tetrachloride, can, be used as the reaction medium. Gaseous reaction products are removed from the reactor during the chlorination reaction. In addition to boron trichloride carbon monoxide (rather than phosgene) and …
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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 November 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 10, 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.