Acrylonitrile polymers stabilized against thermal discoloration with mono and di-isocyanates
CA 1069644 A · Owner: Rohm G.M.B.H. · Inventors: Krieg, Manfred; Meyer, Armin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The Specification describes polymer materials comprising (a) a homopolymer of acrylonitrile or a copolymer of acrylonitrile and at least one further copolymerisable monomer the copolymer, containing at least 20% by weight of units of acrylonitrile; and (b) at least one alkyl, cycloalkyl or aryl isocyanate in an amount sufficient to inhibit or prevent thermal discoloration. The anti-discoloration additive can be incorporated into a monomer composition from which the homopolymer or copolymer is formed or can be admixed with the formed polymer.
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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 January 8, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 1997.
- 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
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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.