Water soluble resins and application thereof to paper coating
CA 2202415 A1 · Owner: Tanikawa, Akira · Inventors: Hasegawa, Toshiyuki; Sato, Sonoe; Kawamura, Akira
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A water soluble resin obtainable by reacting at least two members comprising a polyamine and a urea compound or, at least four members comprising a polyamine a urea compound, a dibasic carboxylic acid compound and a lactam followed, by reacting the reaction product with a cross-linking compound selected from epihalohydrins, .alpha. .gamma. -dihalo- .beta. -, hydrins, glycidyl compounds and isocyanates; and the water soluble resin is useful for paper coating composition by being mixed with a pigment and an aqueous binder; and the paper coating composition does not generate formaldehyde and can give coated papers with various improved properties including excellent ink acceptability and …
Read the whole patent
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 April 11, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 11, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 11, 2019.
- 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.