Process for preparing a composition comprising maleic copolymers with fluorinated thioether end cap to impart soil and stain resistance
CA 2249024 A1 · Owner: Pechhold, Engelbert · Inventors: Pechhold, Engelbert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A copolymer having units of Formula (II) wherein M is H alkali metal, ammonium cation, or a mixture thereof; N is OM or a mixture of OM OR, and , NR1R2 in a molar ratio of (OM):(OR):(NR1R2) of 1-(e+f):e:f wherein e and f , are each independently 0 to 0.5 provided that (e+f) is less than 0.8; R R1, and R2 are each independently H or a branched or straight chain C1-20 alkyl; Y is a C2-10 alkyl, C6-12 aryl, or C4-12 alkoxy; X is a fluorinated thiol radical; Z is H; and v and w are each a positive number such that the molar ratio of v to w is from about 0.4:1 to about 1.3:1 is disclosed.
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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 March 12, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 12, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 2019.
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Timeline
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Sources & verification
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.