US4613648A
Expired / Lapsed
US
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Castable ceramic compositions
Assignee: EIDP Inc
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Filing: 1985-05-24
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Granted: 1986-09-23
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Expires: 2005-05-24
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
2026-10-27 23:58
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C03; C03C; C03C8/00; C03C8/14; C03C8/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
127 words
An organic medium for the dispersion of inorganic solids consisting essentially of a. a mixture of compatible polymers of 0-100% wt. C 1-8 alkyl methacrylate, 100-0% wt. C 1-8 alkyl acrylate and 0-5% ethylenically unsaturated carboxylic acid or ethylenically unsaturated amine dissolved in b. 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 unsaturated amine in the polymer 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
127 words
An organic medium for the dispersion of inorganic solids consisting essentially of a. a mixture of compatible polymers of 0-100% wt. C 1-8 alkyl methacrylate, 100-0% wt. C 1-8 alkyl acrylate and 0-5% ethylenically unsaturated carboxylic acid or ethylenically unsaturated amine dissolved in b. 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 unsaturated amine in the polymer 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
21 words
The organic medium of claim 1 in which the alkyl methacrylate is ethyl methacrylate and the alkyl acrylate is methyl acrylate.
Claim 4
Dependent Claim
30 words
The organic medium 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
14 words
The organic medium of claim 3 in which the carboxylic acid is methacrylic acid.
Claim 6
Dependent Claim
36 words
The organic medium of claim 1 in which the ethylenically unsaturated carboxylic acid is 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
21 words
The organic medium of claim 1 in which the compatible polymers contain 40-80% wt. alkyl methacrylate and 60-20% wt. alkyl acrylate.
Claim 8
Dependent Claim
19 words
The organic medium of claim 1 in which the weight ratio of alkyl methacrylate to alkyl acrylate is 1.5-2.5:1.
Claim 9
Dependent Claim
17 words
The organic medium of claim 1 in which M n is 60,000-80,000 and M w is 200,000-300,000.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |