Method of improving flame resistance of epoxy resins and resulting compositions
CA 1287429 C · Owner: The Dow Chemical Company · Inventors: Beck, H. Nelson
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Epoxy resins reached with an oxirane group containing phosphonate of the formula:, (I), wherein R is hydrogen or lower alkyl and R1 is a lower alkyl and y is 1, 2 or 3 are described. The backbone of the epoxy resin contains a functional substituent which reacts with (I) preferably a hydroxyl substituent. The cured epoxy resins reacted with the phosphonate (I) have improved flame resistance or glass temperatures.
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 August 6, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 6, 2008.
- 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.