Modified block copolymers and processes for the preparation therefor
CA 1233926 A · Owner: Shell Canada Limited · Inventors: Gergen, William, P.; Gelles, Richard; Lutz, Robert G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Thermally stable selectively hydrogenated monoalkenyl-, aromatic hydrocarbon-conjugated diene block copolymers wherein at least one acid compound is grafted to the block copolymer at a secondary or tertiary carbon position and process for the preparation of such modified copolymers by a) melt-mixing a block copolymer and an acid moiety adding a, free radical initiator and graft-reacting under free radical conditions, or, b) dissolving a block copolymer and an acid moiety in a suitable solvent, adding a free radical initiator and graft-reacting under free radical conditions.
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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
- Granted March 8, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 8, 2005.
- 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.