Water-resistant polymeric emulsions
CA 2064081 A1 · Owner: Union Oil Company Of California · Inventors: Biale, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polymeric emulsion comprising a (i) polymer (ii) water, and, (iii) a surfactant is useful for producing a water-resistant film. The polymer comprises about 25 to about 90 weight percent of a soft monomer whose homopolymer has a Tg of less than about -20 ·C, about 10 to about 75 weight percent of a hard monomer whose homopolymer has a Tg of greater than about 30 ·C about 1 to about, 5 weight percent of an olefinic carboxylic acid and about 0.5, to about 5 weight percent of a cross-linking agent. Typically the, polymer comprises less than about 1 weight percent surfactant and has a Tg of about -50· to about 50 ·C and an average particle size of less than about 250 nm. The emulsion …
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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 July 27, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 27, 2012.
- 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.