Process for the continuous bulk production of high impact vinylaromatic (co)polymers
CA 2017353 C · Owner: Balestri, Franco · Inventors: Matarrese, Savino; Balestri, Franco; Borghi, Italo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the continuous bulk production of high impact vinylaromatic copolymers in which the vinylaromatic monomer eventually a vinyl-cyanide comonomer, the rubber a part of, the diluent solvent and the catalyst are premixed in a pre-mixer at a temperature under 100°C and fed to a plug-flow agitated tubular reactor, which is divided into several stages or zones. The mixture in excess is recycled to the premixer and the remaining part of the diluent solvent is injected on the top of the reactor to prevent the formation of incrustations. In the first zone of the reactor the, temperature and the residence time of the mixture are regulated so to have the halving of the catalyst life. The …
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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
- Filed May 23, 1990 and granted November 7, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 23, 2012.
- 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.