Polyolefin resin and method for the preparation thereof
CA 2089591 C · Owner: Sugahara, Akinobu · Inventors: Nakacho, Kenji; Funabashi, Hideo; Sugahara, Akinobu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel method for the preparation of a polyolefin such as an ethylene-based copolymeric resin is proposed. The polymeric resin obtained by the method has a very high average molecular weight to ensure excellent mechanical properties of the shaped articles therefrom but still is capable of exhibiting good molding workability by virtue of the relatively low melting point and low degree of crystallinity. The method comprises contacting an olefin monomer or monomers with a unique catalyst system comprising, for example, (a) a titanium compound such as titanium tetraalkoxides, (b) an aluminoxane compound and (c) an organic aluminum compound such as trialkylaluminums and/or (d) an organic …
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 February 16, 1993 and granted June 3, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 16, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 16, 2015.
- 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.