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US 4,536,535 AGranted
Castable ceramic compositions
AssigneeE. I. Du Pont de Nemours and Company
InventorHugo R. Usala
Life of this patent
Estimating the term…
Abstract
A castable ceramic composition comprising finely divided particles of ceramic solids dispersed in a solution of alkyl acrylate/alkyl methacrylate/carboxylic acid or amine multipolymer in solvent. The ratio of the weight average and number average molecular weights of the multipolymer must be from 2 to 5.5.
Claims13
A ceramic composition consisting essentially of a dispersion of:
- (a) finely divided particles of ceramic solids in a solution of
- (b) a mixture of compatible polymers prepared by solution polymerization of 0-100% wt. C.sub.1-8 alkyl methacrylate, 100-0% wt. C.sub.1-8 alkyl acrylate and 0-5% wt. ethylenically unsaturated carboxylic acid or amine dissolved in
- (c) a nonaqueous organic solvent, the polymers being further characterized as having a number average molecular weight (M.sub.n) of 50,000 to 100,000, a weight average molecular weight (M.sub.w) of 150,000 to 350,000, the ratio of M.sub.w to M.sub.n being no greater than 5.5, the total amount of unsaturated carboxylic acid or amine in the multipolymer mixture is 0.2-2.0% wt. and the glass transition temperature of the polymer and plasticizer therein, if any, is -30.degree. to +45.degree. C.
Dependencies are inferred from the claim text.