Aqueous developable photosensitive polyurethane-(meth)acrylate
CA 2100279 A1 · Owner: Huynh-Tran, Truc-Chi Thi · Inventors: Huynh-Tran, Truc-Chi Thi; Kumpfmiller, Ronald James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A photopolymer useful in preparing waterdevelopable, solid printing plates is prepared by preparing a urethane prepolymer by reacting polyoxyalkylene diols or polyester diols, or a mixture thereof, with an excess of diisocyanate followed by, chain extending the resulting prepolymer mixture with an alkyldialkanolamine, then reacting the chainextended product with a hydroxyalkyl(meth)acrylate. The resulting photopolymer is suitably formulated with additional photoactive (meth)acrylate monomers or oligomers and photoinitiator for casting or extrusion on a substrate to form a flexographic printing plate. Following UV exposure of the plate through a negative unexposed areas can be removed by …
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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 July 12, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 12, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 12, 2015.
- 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.