Production of concentrates of titanium dioxide in polycaprolactam
CA 1180834 A · Owner: Basf Aktiengesellschaft · Inventors: Valentin, Guenter; Hoerauf, Werner; Strehler, Hugo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for the production of a concentrate of from 20 to 50% by weight of titanium dioxide in polycaprolactam, wherein a 5 - 15% strength by weight aqueous suspension of titanium dioxide is metered into a solution of caprolactam in water at from 110 to 150°C at the same rate at which water is distilled off and after all the, water has been distilled off the resulting mixture is polymerized at from 240 to 280°C. This process allows to obtain concentrates of titanium dioxide, which have a long shelf life and a constant concentration, can readily be dispersed in the caprolactam or polycaprolactam melt, and in addition owing to, the omission of water, do not …
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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 January 8, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 2002.
- 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.