Process for preparing microparticles of hydrophilic polymers with a polymeric stabilizer of water-in-oil emulsions
CA 1270599 C · Owner: Ceskoslovenska Akademie Ved · Inventors: Saudek, Vladimir; Rypacek, Frantisek; Drobnik, Jaroslav
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 polymeric stabilizer for emulsions of the water-in-oil type which consists of a, poly(.alpha.-amino acid) polymer made of similar or different monomer units of the general formula, where n has a value ranging from 1 to 4 X is oxygen or a, -HN-group, and R is hydrogen hydroxyalkyl, dihydroxy- or, polyhydroxyalkyl or a radical derived from an alkanoic or hydroxyalkanoic acid, where the alkyl has a linear cyclic, or branched aliphatic chain with 1 to 18 carbon atoms or, R is an arylalkyl. This stabilizer can be used in particular for the preparation of microparticles.
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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 June 19, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 19, 2007.
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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.