US4536535A
Expired / Lapsed
US
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Castable ceramic compositions
Assignee: EIDP Inc
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Filing: 1984-03-29
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Granted: 1985-08-20
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Expires: 2004-03-29
Abstract
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.
Inventors
- 👤 Hugo R. Usala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:11
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63424; C04B35/63428; C04B35/63444
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
137 words
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 1-8 alkyl methacrylate, 100-0% wt. C 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 n ) of 50,000 to 100,000, a weight average molecular weight (M w ) of 150,000 to 350,000, the ratio of M w to M 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° to +45° C.
Claim 2
Dependent Claim
137 words
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 1-8 alkyl methacrylate, 100-0% wt. C 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 n ) of 50,000 to 100,000, a weight average molecular weight (M w ) of 150,000 to 350,000, the ratio of M w to M 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° to +45° C.
Claim 3
Dependent Claim
20 words
The composition of claim 1 in which the alkyl methacrylate is ethyl methacrylate and the alkyl acrylate is methyl acrylate.
Claim 4
Dependent Claim
29 words
The composition of claim 2 in which the ethylenically unsaturated carboxylic acid is a monocarboxylic acid selected from the group consisting of acrylic acid, methacrylic acid and mixtures thereof.
Claim 5
Dependent Claim
13 words
The composition of claim 3 in which the carboxylic acid is methacrylic acid.
Claim 6
Dependent Claim
36 words
The composition of claim 1 in which the ethylenically unsaturated carboxylic acid is a dicarboxylic acid selected from the group consisting of itaconic acid, fumaric acid, maleic acid, maleic anhydride, and half esters and mixtures thereof.
Claim 7
Dependent Claim
20 words
The composition of claim 1 in which the compatible multipolymers contain 40-80% wt. alkyl methacrylate and 60-20% wt. alkyl acrylate.
Claim 8
Dependent Claim
18 words
The composition of claim 1 in which the weight ratio of alkyl methacrylate to alkyl acrylate is 1.5-2.5:1.
Claim 9
Dependent Claim
15 words
The composition of claim 1 in which M n is 60,000-80,000 and Mw is 200,000-300,000.
Claim 10
Dependent Claim
16 words
The composition of claim 1 in which the ceramic solids are dielectric solids or precursors thereof.
Claim 11
Dependent Claim
25 words
The composition of claim 9 in which the dielectric solids are selected from the group consisting of titanates, zirconates, stannates and precursors and mixtures thereof.
Claim 12
Dependent Claim
41 words
The composition of claim 9 in which the dielectric solids are titanates selected from the group consisting of BaTiO 3 , CaTiO 3 , SrTiO 3 , PbTiO 3 , NbTiO 3 , rare earth titanates and precursors and mixtures thereof.
Claim 13
Dependent Claim
27 words
The composition of claim 10 in which the dielectric solids are selected from the group consisting of stannates of Ba or Ca and precursors and mixtures thereof.
Claim 14
Dependent Claim
27 words
The composition of claim 10 in which the dielectric solids are selected from the group consisting of zirconates of Ba or Ca and precursors and mixtures thereof.
References Cited (Backward Citations)
US3125618A
Cited
US3616108A
Cited
US3717487A
Cited
US4010133A
Cited
US3991029A
Cited
US3998917A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |