Improved composition for uniaxially heat-shrinkable biaxially oriented polypropylene film
CA 2288822 A1 · Owner: Pellingra, Salvatore James Jr. · Inventors: Amon, Moris; Pellingra, Salvatore James Jr.; Peet, Robert Guthrie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A uniaxially heat-shrinkable, biaxially oriented multilayer film having a , polypropylene-containing core layer comprising at least 70 wt.% of said multilayer film and optionally, at least one polyolefin-containing skin layer adjacent said core layer, is prepared by biaxially orienting a coextrudate and thereafter orienting said coextrudate by stretching 10 to 40 % in the machine direction. The core layer contains isotactic polypropylene and a sufficient amount of syndiotactic polypropylene to inhibit uniaxial heat shrinkage at temperatures below 50 ~C. The skin layer can be selected from the group consisting of polypropylene, ethylene-propylene copolymer polyethylene, and , …
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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 May 7, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 7, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 7, 2020.
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Timeline
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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.