Improved propylene polymers for oriented films
CA 2262468 A1 · Owner: Exxonmobil Chemical Patents Inc. · Inventors: Mehta, Aspy K.; Lin, Chon-Yie; Chen, Michael Chia-Chao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates generally to crystalline propylene polymers to methods , for their production and to methods for their use in oriented film applications. Specifically, this invention relates to crystalline propylene polymer compositions comprising both propylene homopolymer and propylene copolymer. The compositions are prepared using metallocene catalyst systems comprising at least two metallocenes in a polymerization process that involves the sequential or parallel polymerization of propylene homopolymer and copolymer using propylene with a small amount of comonomer preferably , ethylene. The resulting polymers are excellent for use in the production of biaxially oriented …
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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 August 25, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 25, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 25, 2019.
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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.