Thermoplastic graft copolymers and their use as compatibilizers
CA 2003739 C · Owner: Chung, Tze-Chiang · Inventors: Wang, Hsien-Chang; Chung, Tze-Chiang; Olkusz, Joseph A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Graft copolymers are disclosed having the formula:, (see fig. I), wherein R and R' are hydrogen alkyl, and the primary, and secondary alkyl halides a ranges from about 14 to, 70,000, b ranges from 0 to about 70,000 c ranges from 0, to about 70,000, d ranges from about 1 to 70,000 X comprises a halogen, and Nu is a nucleophilic residue provided by a thermoplastic polymeric nucleophile having a molecular weight of at least about 1,000 and being sufficiently nucleophilic electrons to benzyl halides. Methods for compatibilizing polymer blends utilizing such graft copolymers are also disclosed.
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 November 23, 1989 and granted February 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 23, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 23, 2011.
- 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.