Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles
Patent
1997-02-14
1998-06-16
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
264619, 264650, 264166, 156 89, C04B 35622
Patent
active
057665281
ABSTRACT:
A method for producing ceramic tape used to fabricate electronic devices while eliminating continued shrinkage of the unfired tape. Chemical agents are added to a mixture of ceramic powder and binder to manipulate the crosslinking of the binder. A first approach involves promoting the crosslinking reaction to completion quickly. The second approach involves preventing the crosslinking reaction during the tape slurry mixing and casting processes. A solvent is used to accelerate the crosslinking of the binder in which the solvent may include one or more of acetone, acetylacetone, toluene and ethanol. Preferably, the solvent is a combination of acetone and acetylacetone. A polyhydroxy compound, such as glycerine, may be added to accelerate the crosslinking reaction of the binder. The boron in the tape may alternatively be rendered inoperative as a crossing agent for the binder by pre-reacting the boron with the Lewis base prior to contact with the binder. The preferred Lewis base is an organic amine, such as piperidine.
REFERENCES:
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patent: 4353958 (1982-10-01), Kita
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patent: 4968460 (1990-11-01), Thompson
patent: 5393604 (1995-02-01), Sanchez
"Boron, Metallo-Boron Compounds and Boranes" edited by Roy M. Adams Geneva College, Beaver Falls, PA, Interscience Publishers, 1964, pp. 72-77, 94-97.
"The Organic Chemistry of Boron" by W. Gerrard, Head of Department of Chemistry, Mathematics, Bioloyg and Geology, The Northern Polytechnic, London, Academic Press, 1961, pp. 18-21.
Partlow Deborah P.
Su Wei-Fang
Derrington James
Northrop Grumman Corporation
Sutcliff Walter G.
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