Vinyl aromatic block copolymers and compositions containing them
CA 2245672 A1 · Owner: De Keyzer, Noel Raymond Maurice · Inventors: Van Westrenen, Jeroen; Gerard, Eric-Jack; De Craene, Luc Ives Jaak
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Block copolymers suitable for hot melt adhesive composition characterised in that they have the general formula (AB)p(B1)qX wherein A is , poly(vinylaromatic) block and B and B1 are the same or different poly(butadiene) blocks, wherein the 1,2 addition (vinyl) content is in the range of from 25 to 70 % by weight, wherein X is the residue of a multivalent coupling agent having a maximum of active sites (m) in the range of from 3 to 6, wherein p and q both are integers of from 0 to m provided that the sum of , p and q values is less than m and the coupling efficiency is less than 90 % said block copolymer having an average total vinyl aromatic content in the range of from 10 to 50 wt.% …
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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 February 7, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 7, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 7, 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.