Method for preparing ceramic compositions
AssigneeRohm and Haas Company
InventorsXun Tang, Xianliang Wu, Linda Katherine Molnar
Life of this patent
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Abstract
A method for providing improved compaction, green density, green strength and surface finish properties in simulated stone and mineral-like materials from ceramic green bodies, based on addition of selected polymer additives during ceramic processing, is disclosed. Polymer additives having weight-average molecular weights from 30,000 to 1,000,000, glass transition temperatures from −50 to +90° C., and low hygroscopicity are particularly useful in providing enhanced properties of ceramic products involving processing of large-size granule intermediates.
Claims16
A method for preparing a ceramic composition comprising:
- (a) forming a particulate material mixture comprising 0.1 to 20 weight percent of polymer additive, based on total weight of the mixture, and at least 40 weight percent of mineral matrix material, in the form of granules having an average particle size of 1 to 7 millimeters;
- (b) compacting the granules to form a green body;
- and
- (c) sintering the green body;
- wherein the polymer additive is selected from one or more polymers having a weight-average molecular weight from 30,000 to 1,000,000, a hygroscopicity of less than 6 percent moisture absorbed based on weight of polymer additive, and a glass transition temperature from −50 to +90° C.
A method for preparing a ceramic composition comprising:
- (a) forming a particulate material mixture comprising 0.1 to 20 weight percent of polymer additive, based on total weight of the mixture, and at least 40 weight percent of mineral matrix material, in the form of granules having an average particle size of 1 to 7 millimeters;
- (b) compacting the granules to form a green body;
- and
- (c) sintering the green body;
- wherein the polymer additive is selected from one or more polymers having a weight-average molecular weight from 30,000 to 1,000,000, a hygroscopicity of less than 6 percent moisture absorbed based on weight of polymer additive, and a glass transition temperature from −40 to 0° C.
Dependencies are inferred from the claim text.