Paper with synergistic dry strength additives and process therefor
CA 1047207 A · Owner: Borden Products Limited · Inventors: Chan, Lock-Lim; Guitard, Arthur H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure Paper of high dry strength is produced by adding to a solution of fibers from 0.1 to 2% of a cationic resin and from 0.1 to 2% of an anionic resin. Proportion of cationic to anionic resin is in the range of 99:1 to 50:50. The preferred cationic resin is a condensation product of acetone formaldehyde and polyalkylene polyamine which is prepared in presence of a catalytic amount of a strong inorganic acid and has a mol ratio of 1:3:0.5, respectively. The preferred anionic resin is a copolymer of acrylamide and maleic acid or its anhydride having a mol ratio of from 90:10 to 98:2. -1-
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
- Granted January 30, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 30, 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.