A process for the preparation of a copolymer based on vinyl aromatic compounds and conjugated dienes and the use thereof for the manufacture of vulcanizates with outstanding damping behavior
CA 2316770 A1 · Owner: Wrana, Claus · Inventors: Wrana, Claus; Giebeler, Ellen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
According to the process of the invention copolymers based on vinyl aromatic, compounds and conjugated dimes with an average molecular weight (Mn) from 50,000 to 600,000 g/mole, a vinyl aromatic compound content from S to 50 wt.% and, a conjugated dime content from SO to 95 wt.% are prepared by reacting a vinyl aromatic compound with a conjugated dime in the presence of a lithium metalcontaining , initiator, wherein polymerization is controlled such that the damping in the glass process encompasses a frequency range which is characterized in that the, half width of the maximum of the loss factor tan 8 is greater than 3 frequency decades.
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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 August 28, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 28, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 2022.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.