Process for preparing high-impact vinyl aromatic polymers
CA 1081892 A · Owner: Labofina S.A. · Inventors: Haveaux, Bernard M. J.; Bracke, William J. I.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a process for the preparation of high-impact vinyl aromatic polymers by mass pre-polymerizing a vinyl aromatic hydrocarbon in the presence of a rubber and suspension polymerizing the mass pre-polymer in the presence of hydroxyapatite and at least one ethoxysulphate of the formula RO (C2H4O)X SO3M, wherein R is an alkyl radical containing from 10 to 16 carbon atoms x is from 2, to 6, and M is Na, K, N, NH4 an amine group, or an alkanol, amine group.
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 July 15, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 15, 1997.
- 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.