Vinyl ester copolymer latices and their preparation
CA 1073576 A · Owner: Shell Canada Limited · Inventors: Van Westrenen, William J.; Wassenburg, Teunis C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Latices giving improved wet-scrub resistance on existing paint films are prepared by copolymerization of vinyl esters of alpha-branched monocarboxylic acids with at least 0.5 to 5 wt % of a glycidyl ester of an unsaturated carboxylic acid, followed by reaction with sufficient ammonia to form aminohydroxypropyl groups.
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 11, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 11, 1997.
- 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.