Preparation of curable etherified aminoplast resins and of surface coating resins
CA 1234446 A · Owner: Basf Aktiengesellschaft · Inventors: Weiss, Wolfram; Petersen, Harro; Immel, Guenther
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of curable etherified aminoplast resins based on urea/ aldehyde polycondensates, and the preparation of surface coating resins. Urea is first reacted with an .alpha..alpha.-dialkylaldehyde as much as 50 mol% of which may be replaced by formaldehyde, in a molar ratio urea/aldehyde of about 1-2 at from, 50 to 120°C, in the presence of an acid and in the presence or absence of an alcohol or of other organic solvents, and the 2-oxohexahydropyrimidine derivative obtained in this cyclocondensation is then condensed with formaldehyde in the presence of one or more alcohols and an acid. These aminoplast resins are useful as both acidcurable resins and as resins for …
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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 March 22, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 22, 2005.
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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.