Process for the preparation of aqueous epoxy resin dispersions
CA 2075879 A1 · Owner: Hoechst Aktiengesellschaft · Inventors: Dreischhoff, Hans-Dieter; Geisler, Joerg-Peter; Godau, Claus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of aqueous epoxy resin dispersions, A process for the preparation of aqueous epoxy resin dispersions comprising, (1) 20 to 75% by weight based on the total dispersion, of an epoxy resin constituting a condensation product of, a) epoxy compounds having at least one epoxy group per molecule and an epoxide equivalent weight of 90 to 3000 g/mol, and, b) aromatic polyols; (2) 3 to 20% by weight, based on the total dispersion of an emulsifier comprising, a) a condensation product of an aliphatic polyol and an epoxy compound having at least two epoxy groups per molecule and an epoxide equivalent weight of 90 to 3000 g/mol, the equivalent ratio of the OH groups to the …
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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 August 12, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 12, 2014.
- 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.