Method for improving anhydride-functionalized polymers and products
CA 2090202 A1 · Owner: Jones, Jeffrey A. · Inventors: Jones, Jeffrey A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Anhydride-functionalized polymers are modified in accordance with the present invention by reacting all or a portion of the anhydride functionality with an aliphatic alcohol to convert the anhydride groups to half-esters. Half-esters produced by modifying maleic anhydride grafted ethylene polymers with alcohols are particularly useful. Adhesive blends obtained by combining the alcohol-modified polymers with one or more polyolefin base resins and composite structures wherein said adhesive blends are adhered to EVOH are also provided. Modification of the maleic anhydride grafts in accordance with the process of this invention makes it possible to produce films having improved optical quality.
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 February 23, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 23, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 23, 2015.
- 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.