Polypropylene composition
CA 1300780 C · Owner: Shimomura, Yozo · Inventors: Kojima, Osamu; Shimomura, Yozo; Mori, Kinya
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polypropylene composition capable of producing molded products having superior stiffness impact, resistance, transparency, resistance to whitening on impact on bending and luster is provided which com-, position has (i) a styrene-ethylene?butylene-styrene block copolymer or a styrene-ethylene-propylene block copolymer each in 5 to 30% by weight based on the weight of the composition, blended with a highly crystalline propylene homopolymer (A) having a relationship between its isotactic pentad ratio (P) and melt flow rate (MFR) represented by an expression of, 1.00 ? P ? 0.015 log MFR + 0.955; (ii) a styrene-ethylene?butylene-styrene block copolymer or a styrene-ethylene?propylene block …
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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
- Granted May 12, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 12, 2009.
- 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.