Foamable polymer materials
CA 1102950 A · Owner: Rohm G.M.B.H. · Inventors: Schroder, Gunter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to foamable polymer materials which may be converted upon heating into foam materials particularly polymeric foam, materials having a polyacrylimide or polymethacrylimide structure. The foamable polymer materials are defined as comprising A) a copolymer containing at least 20% by weight of units of acrylic and/or methacrylic acid together, with units of at least one further polymerisable comonomer; the said copolymer further containing 0.01 to 5% by weight of units of at least one metal salt of acrylic or methacrylic acid, and B) a propellant which is compatible with the said copolymer A). They may be prepared by a process which comprises radically polymerising a …
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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 9, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 9, 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.