Thermal stabilization of carbon monoxide copolymers
CA 1340630 C · Owner: Shell Canada Limited · Inventors: Syrier, Johannes Leopold Marie; Van De Weg, Hendrik; Lutz, Robert Gardiner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Stabilized copolymer compositions comprising an alternating copolymer of carbon monoxide and an olefinically unsaturated compound and from 0.03 to 3.0 %w of a sterically hindered phenolic (blend) compound selected from:, 1) bis- and tris-phenolic alkanes 2) tris-phenolic (alkyl)benzenes, 3 tris-phenolic cyanurates 4) symmectrical diesters of hydroxyphenyl substituted aliphatic monocarboxylic acids and N,N'-bis(hydroxyalkyl)oxalamide, 5) blends comprising on the one hand specific defined phenolic compounds, and on the other hand aromatic amines and/or compounds of general formula R100C-(CH2)p-S-(CH2)q-COOR2, in which p q, R1 and R2 have defined meanings.
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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 July 6, 1999. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 6, 2016.
- 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.