Rosin emulsion composition for paper sizing and method of sizing using the same
CA 2081786 A1 · Owner: Japan Pmc Corporation · Inventors: Nagao, Kazuki; Nakamura, Katsunori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
of Disclosure, The present invention provides a rosin emulsion composition for paper sizing obtained by dispersing a rosinous substance containing an ester formed from a rosin and a polyhydric alcohol or polyhydric phenol directly in water with the aid of a cationic acrylamide polymer and/or methacrylamide polymer having a hydrophobic group and a method of sizing using the same. The sizing composition of the present invention exhibits an excellent sizing effect which cannot be achieved by a conventional rosin sizing agent in a neutral papermaking system containing calcium carbonate not to mention in an acidic papermaking system. It is also excellent in storage and mechanical stabilities and …
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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
- Filed October 30, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 30, 2014.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.