Urea-aldehyde polycondensates, preparation thereof and use thereof as surface coating binders
CA 1296470 C · Owner: Fischer, Kurt · Inventors: Kasch, Hellmuth; Schmidt, Horst; Fischer, Kurt
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
0, Abstract of the Disclosure: Urea-aldehyde polycondensates usable as surface coating binders are obtainable by stepwise reaction of, a) urea and/or urea derivatives with acidic CH aldehydes in a molar ratio of urea:aldehyde of 1:2 in the presence of acids and at from 60 to 120°C with b) a mixture of 3 moles of formaldehyde per mole of urea and 3 moles of an acidic CH aldehyde per mole of urea at from 60 to 120°C with subsequent removal of the water of reaction and treatment of the reaction mixture with an alkali metal alcoholate at from 80 to 100°C.
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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
- Granted February 25, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 25, 2009.
- 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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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.