Process for the suspension polymerization of vinyl chloride
CA 1068046 A · Owner: Anic S.P.A. · Inventors: Foschi, Claudio; Mora, Corrado; Fronzoni, Ferruccio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to an improved process for the polymerization of vinyl chloride. The improvement comprises the addition to the polymerization reaction mixture of (i) from 0.01 to 0.5% by weight of the monomers of a polyvinyl alcohol having an average saponification of from 300 to 500 and (ii) from 0.01 to 0.5% by weight based on the monomers of clay, bentonite, or a hydroxylated compound containing an element from Group IIA, IIB IIIA, IVA, or VIII of, the Periodic System to prevent the forming of incrustations on the walls of the reactor.
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 December 11, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 11, 1996.
- 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.