Paper coating composition
CA 1098633 A · Owner: Polysar Limited · Inventors: Lobos, Zbigniew J.; Polatajko-Lobos, Elsa S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PAPER COATING COMPOSITION", Abstract of the Disclosure The upward drift in viscosity which is characteristic of alkali-containing paper coating compositions prepared from alkali-swellable latices can be arrested at any desired viscosity level by including in the composition 0.l-l0 parts by weight per l00 parts by weight of dry solids in the uncompounded alkali-swellable latex, of a poly- C2-C4 alkylene glycol having a weight average molecular weight of l00 - 5,000. Polyethylene and polypropylene glycols having molecular weights of about l,200 are shown to produce excellent results.
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 March 31, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 31, 1998.
- 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.