Polypropylene compositions of improved clarity
CA 1269488 C · Owner: Teskin, Frederick M. · Inventors: Teskin, Frederick M.; Ficker, Harold K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Incorporation of an ethoxylated amine in a sodium benzoate nucleated propylene polymer resin synergistically improves clarity as well as yellowness over what is achieved by use of sodium benzoate or ethoxylated amine alone. BACKGROUND OF THE INVENTION The present invention relates to a method of improving the clarity and yellowness of propylene polymers produced in the presence of supportbased, high activity coordination catalysts. These polymers generally do not require deashing prior to use and therefore contain acidic catalytic residues which need to be neutralized prior to processing of the polymer. In order to improve the polymer clarity sodium benzoate can be added as, a nucleating …
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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 22, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 22, 2007.
- 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.