Cationic surface sizing agent and paper coated with the same
CA 2647741 C · Owner: Harima Chemicals, Inc. · Inventors: Inaoka, Kazushige; Hashiguchi, Yoshiharu; Nakata, Tomohiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention improves a sizing effect even on paper containing no internal sizing agent and improves productivity by making solution polymerization in a small , amount of an organic solvent. The invention provides a cationic surface sizing agent , composed of a copolymer obtained by solution polymerization of (a) 15 to 35% by , weight of a tertiary amino group-containing monomer (b) 30 to 85% by weight , of C, to , C4 alkyl (meth)acrylate and (c) 1 to 50% by weight of styrenes in an organic solvent in , the presence of a chain transfer agent. The copolymer may be subjected to cationization treatment with a quaternization agent. As a constituent monomer of the , copolymer, 0 to 20% …
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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 March 30, 2006 and granted May 29, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 30, 2026.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
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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.