Polymer made of lignin, and method for making it
CA 1050013 A · Owner: Rauma-Repola Oy · Inventors: Hortling, Bo.; Lindberg, Jarl J.; Turunen, Johannes
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a three-dimensional aromatic, sulfur-containing polymer of great molecular size and based on lignin, and to a method for manufacturing this polymer. The polymer is characterized in that it is amorphous practic-, ally insoluble in water and conventional organic solvents; it contains thioether bonds and possibly sulfoxide and/or sulfone groups formed by oxidizing of thioether bonds and possibly, carbon-carbon bonds between aromatic rings and/or side chains and possibly other bonds typical to lignin. Its thermostability is at least 200°C; and it has been obtained from lignin which is dissolved or undissolved, chlorinated or unchlorinated purified, or containing other …
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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 March 6, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 6, 1996.
- 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.