Foamable vinyl chloride resin composition for powder molding and method for producing same
CA 1295084 C · Owner: Wakatsuki, Akira · Inventors: Matsuura, Isao; Wakatsuki, Akira; Shida, Yuu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided a method of producing a foamable vinyl chloride resin composition for powder molding in which from 40 to 120 parts by weight of a plasticizer is blended with 100 parts by weight of a granular vinyl chloride resin obtained by suspension polymerization or bulk polymerization. From 0.5 to 40 parts by weight of at least one polymer or copolymer having an active hydrogen in the molecule and from 0.1 to 10 parts by weight of a crosslinkable isocyanate compound are added and dryblended, and while the temperature of the dry-blend system is in the course of cooling after it has reached a maximum temperature, from 3 to 25 parts by weight of a finely powdered vinyl chloride resin …
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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 January 28, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 28, 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.