Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1991-11-22
1994-01-25
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524445, 524547, 524609, 524650, 524723, 524743, 524745, 526287, 526288, C08J 510, C08K 318, C08K 322, C08L 8100
Patent
active
052816508
ABSTRACT:
The invention relates to a method of preparing sintered shapes, comprising the steps of: (1) forming a green body from a mixture comprising (A) at least one inorganic powder with (B) at least one polymer derived from (a) at least two sulfo monomers or (b) a combination of (i) a sulfo monomer with (ii) at least one monomer selected from acrylic compounds, acrylonitriles, vinyl lactams and vinyl pyrrolidones and maleic acids, anhydrides or salts, provided the mixture is substantially free of polysaccharide; (2) sintering the body. Inorganic shapes made from the compositions of the present invention have relatively high fired densities; small uniform grain sizes; and relatively low porosity. The sulfo polymers of the present invention help disperse the inorganic powder. These polymers improve deagglomeration of the inorganic powder and also help prevent reagglomeration of the powder. The polymers provide divalent ion stability for systems using water containing divalent ions, such as hard water. These polymers help reduce viscosity of inorganic powder slurries and improve defloculation of the inorganic powder.
REFERENCES:
patent: 4509987 (1985-04-01), Farrar et al.
patent: 4836966 (1989-06-01), Shimuzu et al.
Lubrizol AMPS Monomer brochure.
Dispersions of Ceramic Powders in Organic Media, Advances in Ceramics vol. 21: Ceramic Powder Science Copyright 1987, The American Ceramic Society, Inc. pp. 411-415.
Dispersants in Ceramics Processing British Ceramics Proceedings Published by British Ceramics Society, vol. 37 (1986) pp. 249-253.
Tape Casting: The Basic Process for Meeting the Needs of the Electronics Industry, Ceramic Bulletin, vol. 69, No. 6, 1990, pp. 1022-1026, by R. Mistler.
Burk W. Michael
Quinn Robert E.
Collins Forrest L.
Michl Paul R.
Rajguru U. K.
The Lubrizol Corporation
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