Coating compositions based on polyepoxides and polyacid curing agents
CA 1340156 C · Owner: Ppg Industries, Inc. · Inventors: Chang, Wen-Hsuan; Klanica, Joseph A.; Dufford, Edward L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A coating composition suitable for use as an automotive topcoat, particularly a clear coat in a composite color-plus-clear coating, is disclosed. The resinous binder of the coating composition comprises a polyepoxide and a polyacid curing agent having more than three carboxylic acid groups per molecule. The polyacid curing agent is formed from reacting a polyol component comprising an oligomeric ester having an average of more than three hydroxyl groups per molecule with a 1,2-anhydride of a cyclic dicarboxylic acid. The polyacid curing agents have relatively high acid functionality low, molecular weights and good reactivity making them very effective curing agents for high solids coating …
Read the whole patent
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 December 1, 1998. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 1, 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.