Non-hazing uv curable powder coatings containing crystalline resins
CA 2279164 C · Owner: Haley, Richard P. · Inventors: Haley, Richard P.; Snyder, Matthew B.; Reinheimer, Eugene P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention provides a UV curable powder coating composition comprising a particulate blend of a non-crystalline unsaturated polyester base resin a , crystalline, unsaturated crosslinker resin co-polymerizable with the base resin and a , photoinitiator, that, exhibits reduced or eliminated having in the cured coating formed therefrom upon being, cured at low temperatures demanded by certain heat sensitive substrates. This is, accomplished by incorporating in the powder composition a recrystallization or haze inhibitor, which is comprised of a crystalline epoxy resin. When this powder blend is melted for, curing, the crystalline crosslinker resin visually appears to separate and …
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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 30, 1999 and granted January 21, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 30, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 30, 2021.
- 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.