Gas barrier polyurethane resin
CA 2314574 A1 · Owner: Mitsui Takeda Chemicals, Inc. · Inventors: Tawa, Tsutomu; Shiraki, Hiroyuki; Uchida, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyurethane resin having a total, concentration of the urethane group and the urea group of not less than 15% by weight is prepared by reacting a diisocyanate component (e. g. an aromatic diisocyanate) with a diol component , (e.g. a C2-8alkylene glycol). The repeating unit of the polyurethane resin may contain a constitutive unit of an aromatic or alicyclic compound. The polyurethane resin may be shaped into a film for use as a gas barrier film. The film may be a gas barrier composite film composed of a base film layer and a resin layer at least comprising the polyurethane resin. The present invention provides a polyurethane resin excellent in gas barrier properties against water vapor …
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 July 26, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 26, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 26, 2022.
- 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.