Aqueous dispersions, a process for their preparation and the use of the dispersions as sizing agents
CA 1270352 C · Owner: Eka Nobel Ab · Inventors: Helmer, Ulla Karin Elisabet; Johansen, Randi Helene
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Aqueous cationic or anionic dispersions of rosin and certain synthetic sizing agents, carbamoyl chlorides ketene dimers or acid anhydrides. The particles in the dispersed phase contain a mixture of rosin and synthetic sizing agent and the dispersions are prepared by homogenisation of a homogeneous mixture of the rosin material and the synthetic sizing agent in the presence of a dispersing agent. The dispersions are used as sizing agents in the production of paper, paper board, board and similar products.
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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 June 19, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 19, 2007.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.