US3962162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rigidly bonded green ceramics and processes
Assignee: Coors Electronic Package Co
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Filing: 1974-02-19
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Granted: 1976-06-08
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Expires: 1994-02-19
Abstract
Abstract Thermosetting refractory compositions which require no drying are obtained from unpolymerized unsaturated polyesters and cross-linking vinyl monomers and desired refractories together with mold release materials. Organic fillers may be included to give more porous fired refractories. Danger of blistering of the thermoset shape on firing is counteracted by a volatile material which forms a reticulum of capillaries in the thermoset shape. Compositions may be used for extrusion, molding or injection, thermosetting occurring simultaneously or subsequently.
Inventors
- 👤 Horst W. Schmank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:05
CPC Classifications
C; C08; C08K; C08K13/00; C08K13/02; C08K3/00; C08K3/18; C08K3/24; C08K3/34; C08L; C08L33/00; C08L67/00; C08L67/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
128 words
A formable green refractory composition flowable at temperatures of 20° to 40° C., curing to become rigid and shape-retentive at elevated temperatures below about 200° C. and firing at temperatures above at least 600° C. to refractory, said composition being thermosetting and comprising in percent by weight: a. about 60 to 98% refractory powder; b. about 1 to 30% linear unsaturated polyester having molecular weight of about 400 to 10,000 and hydroxyl numbers from about 5 to about 150; c. about 1/2-12% unsaturated vinyl monomer for crosslinking and dilution; d. about 0.02 to 0.5% catalyst for free radical polymerization; e. about 0.5 to 5% internal mold release compounds and f. about 0.5 to 7% volatile mold release and lubricant miscible with said saturated polyester and said vinyl monomer.
Claim 2
Dependent Claim
128 words
A formable green refractory composition flowable at temperatures of 20° to 40° C., curing to become rigid and shape-retentive at elevated temperatures below about 200° C. and firing at temperatures above at least 600° C. to refractory, said composition being thermosetting and comprising in percent by weight: a. about 60 to 98% refractory powder; b. about 1 to 30% linear unsaturated polyester having molecular weight of about 400 to 10,000 and hydroxyl numbers from about 5 to about 150; c. about 1/2-12% unsaturated vinyl monomer for crosslinking and dilution; d. about 0.02 to 0.5% catalyst for free radical polymerization; e. about 0.5 to 5% internal mold release compounds and f. about 0.5 to 7% volatile mold release and lubricant miscible with said saturated polyester and said vinyl monomer.
Claim 3
Dependent Claim
16 words
The composition of claim 1 wherein unsaturated monomer for cross-linking is at least partly diallyl phthalate.
Claim 4
Dependent Claim
15 words
The composition of claim 1 wherein unsaturated monomer for cross-linking is at least partly vinyl-toluene.
Claim 5
Dependent Claim
22 words
The composition of claim 1 wherein the unsaturated polyester is modified by inclusion of up to 50% its weight of acrylic modifier.
Claim 6
Dependent Claim
12 words
The composition of claim 1 additionally containing viscosity depressor or leveling agent.
Claim 7
Dependent Claim
33 words
The composition of claim 1 wherein the refractory is refractory ceramic in an amount of about 60 to 90%, the unsaturated polyester is in an amount of 5-30% and unsaturated monomer is 1-12%.
Claim 8
Dependent Claim
14 words
The composition according to claim 6 additionally comprising 0.5 to 5% of metal stearate.
Claim 9
Dependent Claim
26 words
The composition according to claim 6 additionally including water in an amount sufficient to provide an approximately monomolecular layer on the surface of the refractory ceramic.
Claim 10
Dependent Claim
24 words
The composition according to claim 1 additionally including polymerization promoter in an amount of from about 0.1 to 3% by weight of said composition.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |