Hydrophobic modified diquaternary monomers and polymers as thickening agents of acidic aqueous compositions
CA 2548779 C · Owner: Rhodia Inc. · Inventors: Chang, Jeanne; Liu, Leo Z.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to the preparation of hydrophobic modified diquaternary cationic monomers and their copolymer as well as the use such monomers and copolymers as thickening agents/rheology modifiers for acidic compositions. The hydrophobic modified diquaternary cationic monomer having the general formula (I): wherein X is selected from O NH , or NR; Y is any alkyl, alkylene with or without heteroatoms and R0, R1, R2 R3, R4, which are , identical or different are selected from C1-C4 alkyl groups, R is selected from any alkyl group with or without heteroatoms and R5 is a hydrphobe having , an alkyl chain of more than 4 atoms.
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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 December 8, 2004 and granted January 29, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 8, 2024.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
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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.