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Patent EP0114746A2 successfully refreshed from Google Patents.
EP0114746A2
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Polyacetal binders for injection moulding of ceramics
Assignee: Celanese Corp
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Filing: 1984-01-19
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Granted: —
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Expires: 2004-01-19
Abstract
Abstract A ceramic composition suitable for injection molding comprises a ceramic powder and a binding agent in an amount effective to permit succesful injection molding. The binding agent is comprised of a defined polyacetal which, upon heating, volatilizes evenly and completely thereby resulting in a sintered ceramic article without any latent defects or weak spots.
Inventors
- 👤 Gerry Farrow
- 👤 Anthony B. Conciatori
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 11:32
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63408; C04B35/6342; C04B35/638; C08; C08K; C08K3/00; C08K3/10; C08L; C08L59/00; C08L23/00; C08L91/00; C08L91/06
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
29 words
A ceramic composition suitable for injection moulding comprising: a) a ceramic powder; and b) a binding agent, said binding agent being comprised of a polyacetal having the recurring unit
Claim 2
Dependent Claim
29 words
A ceramic composition suitable for injection moulding comprising: a) a ceramic powder; and b) a binding agent, said binding agent being comprised of a polyacetal having the recurring unit
Claim 3
Dependent Claim
19 words
The ceramic composition of claim 1 wherein the polyacetal forms from 15 to 50% by weight of the composition.
Claim 4
Dependent Claim
19 words
The ceramic composition of claim 2 wherein the polyacetal forms from 20 to 35% by weight of the composition.
Claim 5
Dependent Claim
30 words
The ceramic composition of any of claims 1-3 wherein the ceramic powder is selected from aluminium oxide, zirconium oxide, silicon dioxide, silicon nitride, silicon carbide, silicon, ferrite and mixtures thereof.
Claim 6
Dependent Claim
12 words
The ceramic composition of claim 4 wherein the ceramic powder is ferrite.
Claim 7
Dependent Claim
30 words
The ceramic composition of any of claims 1-5 wherein the binding agent further contains a material selected from low density polyethylene, atactic polypropylene, ethylene vinyl acetate, waxes and mixtures thereof.
Claim 8
Dependent Claim
21 words
The ceramic composition of any of claims 1-6 which further comprises from 0.5% to 2.0% by weight of a wetting agent.
Claim 9
Dependent Claim
21 words
The ceramic composition of any of claims 1-7 which further comprises from 1.0 to 10% by weight of a plasticising agent.
Claim 10
Dependent Claim
41 words
9 . A process of moulding a ceramic composition comprising: a) forming the ceramic composition of any of claims 1-8; b) injection moulding the composition; c) heating the injection moulded composition to remove the binding agent; and d) sintering the composition.
Claim 11
Dependent Claim
38 words
The process of claim 9 wherein prior to the injection moulding step, the composition exhibits a viscosity of less than 1000 poise at a shear rate of 1,000 sec -1 within a temperature range from 100 to 300°C.
Claim 12
Dependent Claim
31 words
The process of claim 9 or 10 wherein the binding agent is removed by heating to a temperature in the range from 20 to 300°C for from 0.5 to 2.0 hours.
Claim 13
Dependent Claim
24 words
The process of any of claims 9-11 wherein the injection moulded composition is sintered at a temperature in the range from 1000 to 1800°C.
Claim 14
Dependent Claim
19 words
The process of any of claims 9-12 wherein the mixture is extruded and chipped prior to being injection moulded.
References Cited (Backward Citations)
No citation records indexed.
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