Ethylene random copolymer, process for its preparation and rubber composition
CA 2228029 A1 · Owner: Hosoya, Mikio · Inventors: Hosoya, Mikio; Tojo, Tetsuo; Hakuta, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing an ethylene/.alpha.-olefin/norbornene nonconjugated polyene random copolymer, comprising preparing an ethylene random copolymer simultaneously meeting the following requirements (1) to (5): (1) the molar ratio of ethylene (a) to an .alpha.-olefin (b) having 3 to 20 carbon atoms ranges from 40:60 to 95:5; (2) a given amount of non conjugated polyene (c) has a norbornene skeleton; (3) the available network chain density is not less than 1.5 x 1020/cm3 after press cross-linking of the copolymer using a dicumyl peroxyde; (4) the ratio of the rate .gamma.1 of shear showing a shearing stress of 0.4 x 106 dyn/cm2 as determined from the melt flow curve at 100 ~C and …
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
- Filed May 28, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 28, 2019.
- 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.