Living radical graft copolymerization of vinyl monomers initiated from the structural defects of polyvinylchloride
CA 2435217 A1 · Owner: Asgarzadeh, Firouz · Inventors: Percec, Virgil; Asgarzadeh, Firouz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A graft copolymer composition and the preparation of the composition by living radical polymerization is disclosed. The polymerization reaction can be initiated at active chlorine sites on the poly(vinyl chloride) backbone in conjunction with a transition metal catalyst and an optional ligand. The graft copolymers are useful as, among others compatibilizers for blends and alloys, as high heat distortion temperature poly(vinyl chloride) materials as impact , modifiers, and permanently plasticized materials.
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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 January 16, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 16, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 16, 2024.
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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.