Polypropylene composition for air quenched blown films
CA 2540887 C · Owner: Dow Global Technologies Llc · Inventors: Pierni, Peter E.; Pirtle, Shaun E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is directed to a polypropylene resin which is suitable for , manufacturing an air quenched blown film. The resin has a melt flow rate of greater than 5 g/10 min, less than 2% xylene solubles a pentad isotacticity , of greater than 95% an isotactic pentad/triad ratio of greater than 95% a , crystallinity of at least 65%, and a crystallization temperature of at least 127~C. The polypropylene resin contains from 500 ppm to 2500 ppm of a nucleator/clarifier additive. A quenched blown film made from resin exhibits a crystallization onset temperature of at least 116~C and a crystallization halflife time of less 4.1 seconds or less when tested using fast DSC analysis with a scan …
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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 October 7, 2004 and granted July 10, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 7, 2024.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
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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.