Anti-fatigue coagents for rubber vulcanization
CA 2134654 A1 · Owner: Akzo Nobel Nv · Inventors: Talma, Auke G.; Datta, Rabindra N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel metal salts of (poly)citraconimide and (poly)itaconimide carboxylic acids, and a vulcanizable rubber composition comprising these novel metal salts and which, upon vulcanization exhibits, improved dynamic properties, are disclosed. Also disclosed are a sulfur-vulcanization process carried out in the presence of these metal salts and the product of said vulcanization process. The novel metal salts are represented by formulas (I) and (II) wherein, R1, R2 and R3 are independently selected from hydrogen C1-C18 alkyl groups, C3-C18 cycloalkyl groups C6-C18, aryl groups, C7-C30 aralkyl groups and C7-C30 alkaryl groups and R2 and R3 may combine to form a ring when R1 is hydrogen; R4 is …
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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
- Filed April 28, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 28, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 28, 2015.
- 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.