Polymerisable esters
CA 1080238 A · Owner: Ciba-Geigy Ag · Inventors: Green, George E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The esters are soluble in an aqueous solution of a base before exposure to actinic radiation but on exposure to actinic radia-, tion, polymerise and become insoluble in such an aqueous solution. Development of photopolymerised images does not therefore require the use of toxic or flammable organic solvents. They contain free carcoxyl groups and at least one unit of the formula I-IV , I II, , III IV, where R1 is a carbon atom chain containing specified groupings such as one of formula -CH=CH-CO-CH=CH- -CH=CHCO-, -COCH=CHC6H4CH=, CHCO-, or . They are obtained by the reaction, of an at least dianhydride of a polycarboxylic acid with alcoholic hydroxyl groups of an alcohol containing at least …
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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 24, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 24, 1997.
- 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.