Ethylene oxide/propylene oxide block copolymers as green binders for ceramics
Patent 5324770 Issued on June 28, 1994. Estimated Expiration Date: 
June 17, 2012. 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 17, 2012. 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 ReferencesCeramic composition and process for use thereof Binder composition for injection molding Patent #: 4898902 InventorAssigneeApplicationNo. 900503 filed on 06/17/1992US Classes:524/516, Solid polymer derived from nitrogen heterocycle monomer523/139, Composition related to metal foundry molding or metallurgical furnace or process of preparing524/413, Transition metal other than Group VIII DNRM (i.e., Sc, Ti, Mn, Cu, Y, Zr, Tc, Hf, Re)524/430, A single type of metal atom and only oxygen atoms DNRM, e.g., metal oxide, etc.524/515Two or more solid polymers derived from ethylenic reactants onlyExaminersPrimary: Michl, Paul R.Assistant: Guarriello, John J. Attorney, Agent or FirmInternational ClassC08L 039/06AbstractThe present invention comprises block copolymers of alkylene oxides, such as ethylene oxide and propylene oxide, which are further formulated with additional polymers such as poly(N-vinylpyrrolidinone), poly (vinyl alcohol), and certain low foam additives. These polymers are useful for the coating of alumina powders for use in ceramics. In aqueous media, their lower viscosities enable facile spray drying of the coated alumina powders. The coated alumina powders may be compressed under relatively low pressure into high density forms with superior unfired compressive strengths (green strength), they are surprisingly insensitive to relative humidity, are readily ejected from the mold, and finally do not have a deleterious effect upon the ultimate high temperature sintering of the formed bodies.Other References
Field of SearchTransition metal other than Group VIII DNRM (i.e., Sc, Ti, Mn, Cu, Y, Zr, Tc, Hf, Re)Two or more solid polymers derived from ethylenic reactants only Solid polymer derived from nitrogen heterocycle monomer A single type of metal atom and only oxygen atoms DNRM, e.g., metal oxide, etc. Composition related to metal foundry molding or metallurgical furnace or process of preparing | |
