Coating compositions comprising a blend of an ethylene vinyl acetate and a fatty acid and emulsions
CA 2001109 C · Owner: Brown, Nicholas · Inventors: Brown, Nicholas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Coating compositions based on ethylene vinyl actetate polymers have improved compatibility with solvents (especially with aliphatic hydrocarbon solvents) hydrocarbon oils, and mineral waxes by blending the EVA with a fatty acid and heating at or above the melting point of the EVA. Furthermore the resultant blends are much more easily emulsified in the presence of cations than blends which have not been processed with the fatty acids. Typically the starting material for the improved product of this invention is a composition comprising, a blend of an EVA polymer and a fatty acid which is miscible in all proportions, with mineral spirits at 25°C or forms a solution at a level 5% of fatty …
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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 October 20, 1989 and granted November 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 20, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 20, 2011.
- 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
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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.