Method for producing powdered coating-agents with a polyamide base
CA 1135448 A · Owner: Chemische Werke Huls Aktiengesellschaft · Inventors: Feldmann, Rainer; Hornung, Karl-Heinz; Smigerski, Hans-Jurgen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved method for producing coating agents in powder form by the precipitation process is described. The powdered coating agents have a polyamide base having at least 10 aliphatically combined carbon atoms per carbonamide group, or co-polyamides, or mixtures of homo- and co-polyamides containing at least 70% of the said components. The method is characterised in that polyamides having a relative viscosity of between 1.4 and 1.8 (measured in a 0.5% m-cresol solution at 25°C) are mixed with at least twice the amount by weight of ethanol, the said mixture being converted by mechanical movement at temperature of between 130 and 150°C into a solution, this solution, being then adjusted to …
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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 November 9, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 9, 1999.
- 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.