Polypropylene resin composition
CA 2003390 A1 · Owner: Mitsui Toatsu Chemicals, Inc. · Inventors: Miyazaki, Takashi; Kawai, Yoichi; Abe, Masaru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a polypropylene resin composition useful as an adhesive comprising (A) from about 55 wt. % to about 99 wt. % of a modified polypropylene resin graft-modified with a radical polymerizable polar unsaturated compound or a mixture of the same with an unmodified polypropylene resin and (B), from about 1 to about 45 wt. % of an ethylene/propylene copolymer rubber having an ethylene content of from about 10 wt. % to about 45 wt. %.t. The resin composition is particularly suitable for bonding a polypropylene resin layer and an ethylene/vinyl alcohol copolymer layer and for bonding a polypropylene resin layer and a polyamide resin layer.
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 20, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 20, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 20, 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.