Method for producing magnetic coating composition and magnetic recording medium
Patent 5234614 Issued on August 10, 1993. Estimated Expiration Date: 
June 13, 2011. 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.
June 13, 2011. 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 ReferencesMixer control system Method of mixing and kneading control of a rubber kneader Method of manufacturing a paint composite for magnetic films Method of preparing kneaded mixture for magnetic coating material Patent #: 4946615 InventorsAssigneeApplicationNo. 714608 filed on 06/13/1991US Classes:252/62.54, Synthetic resin252/62.53, With wax, bitumen, resin, or gum366/601, MOTOR CONTROL416/38Drive engine condition excluding shaft speed or torqueExaminersPrimary: Johnson, Jerry D.Attorney, Agent or FirmInternational ClassesC04B 035/04H01F 001/00 H01F 001/26 Foreign Application Priority Data1990-06-14 JPAbstractA magnetic coating composition prepared by a method comprising a wetting step for wetting powder materials including a magnetic powder with a small amount of a solvent in a kneading machine having an agitation means in a closed container, a first kneading step comprising adding an amount of a binder resin and an amount of a solvent to a mixture from the wetting step and mixing and kneading it, a second kneading step comprising continuously adding the solvent till a consumed power of a kneading apparatus reaches maximum, a third kneading step comprising stopping the addition of the solvent at the maximum consumed power and further kneading the mixture, and a dilution step comprising gradually adding the solvent to the mixture while applying shear force, in which composition, the magnetic powder is highly dispersed and which provides a coating type magnetic recording medium having good properties.Other References
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