Heat-curable polymers which contain imide groups and process
CA 1270592 C · Owner: Lees, Robert G. · Inventors: Lees, Robert G.; Kohli, Dalip K.; Tuttle, Donna M.B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Heat curable compositions comprise (a) a bismaleimide e.g. bismaleimidodiphenylmethane, and (b) a heat activatable curing agent therefor comprising in combination (i) a polyamine and (ii) an alkenylphenol or alkenylphenol ether. After reaction preferably at temperatures of 100° to, 250°C. optionally in admixture with polymerization catalysts, shaped articles, laminates, adhesive bonds and foams are produced. These have superior mechanical properties especially hot/wet properties and improved resistance to thermal aging.
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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.
- 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.