Acrylic acid-acrylate copolymer thickening agents
Patent 4268641 Issued on May 19, 1981. Estimated Expiration Date: 
May 29, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 29, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorsAssigneeApplicationNo. 06/154521 filed on 05/29/1980US Classes:525/367, Elemental metal or inorganic metal compound524/558, Acid or ester contains an oxygen atom which is other than part of a free carboxyl group or carboxylic acid ester group524/833, Two or more carboxylic acids or derivatives525/369, Metal hydroxide525/374, Chemical treating agent is a nitrogen-containing compound525/378, Ammonia, ammonium hydroxide, or salts thereof525/379, Organic amine526/310, From nitrogen containing monomer other than acrylonitrile or methacrylonitrile526/311, Nitrogen bonded to oxygen atom (including nitrogen containing salts)526/318.41, Monomer contains chalcogen other than in C(=O)-O- chalcogen in any monomer)526/328, Derived from an ethylenically unsaturated carboxylic acid526/932THICKENER OR DISPERSANT FOR AQUEOUS SYSTEMExaminersPrimary: Kight, III, JohnAttorney, Agent or FirmInternational ClassesC08F 8/44 (20060101)C08F 8/00 (20060101) AbstractCopolymers of acrylic acid and nonionic surfactant acrylates have been found to be useful thickening agents for both aqueous solutions and water/liquid hydrocarbon emulsions. | |
