Terpolymers of acrylamide, alkylacrylamide and betaine monomers
Patent 4650848 Issued on March 17, 1987. Estimated Expiration Date: 
December 30, 2005. 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.
December 30, 2005. 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 ReferencesAcrylamide copolymer thickener for aqueous systems Acrylamide-alkylacrylamide copolymers Microemulsion process for producing acrylamide-alkyl acrylamide copolymers Drag reduction agent Patent #: 4560710 InventorsAssigneeApplicationNo. 06/814252 filed on 12/30/1985US Classes:526/287, From monomer containing three or more oxygen atoms bonded to a single sulfur atom, e.g., sulfonate, etc.526/307.2With monomer containing carboxylic acid amide groupExaminersPrimary: Michl, Paul R.Attorney, Agent or FirmInternational ClassesC08F 220/00 (20060101)C08F 220/56 (20060101) AbstractA water soluble terpolymer having the structure: ##STR1## wherein x is selected from the group consisting of ##STR2## wherein x is about 1 to about 95 mole percent; y is about 0.1 to about 5.0 mole percent; R1 is methyl or hydrogen; z is about 1 to about 30 mole percent; R2 is an alkyl group of 1-5 carbon atoms; R3 is an alkyl group of 3 to 4 carbon atoms; R4 is an alkyl group of 1-5 carbon atoms; and R5 is an alkyl group of 4-20. | |
