Process for foaming a polymerizable medium using acid sensitive azo compounds with a polymerizable monomer and free radical inhibitor
CA 1102498 A · Owner: Pennwalt Corporation · Inventors: Kamath, Vasanth R.; Kamens, Ernest R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the foaming of a polymerizable medium (such as an unsaturated polyester resin) by using acid sensitive azo compounds, significant improvement in the foaming efficiency can be obtained by incorporating in the resin medium 0.001% - 10% by weight based on the weight of the resin compounds which exert an inhibiting effect on free radical polymerization. Examples of such compounds include methacrylonitrile alphamethylstyrene and laurylmercaptan.
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 June 2, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 2, 1998.
- 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.