Azo compounds containing hindered amine moieties with low basicity
CA 2012506 C · Owner: Ciba-Geigy Ag · Inventors: Ravichandran, Ramanathan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds which contain an azo group as well as a hindered amine light stabilizer moiety of low basicity function as free radical polymerization initiators and provide a polymer containing a hindered amine stabilizer chemically bonded to said polymer. The low basicity of the instant compounds prevents interaction with acid catalysts used in some polymerization systems. The compounds have the formula I E1-N=N-E2 (I), where, E1 is a radical of the formula (see formula I or II), wherein, R1 and R2 are for example, C1-C36 alkyl, G1 and G2 are for example, C1-C4 alkyl, T is, for example formyl, and, E2 may be the same as E1 or may be for example, C1-C36, alkyl, with the proviso that at least one …
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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 March 19, 1990 and granted January 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 2012.
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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.