EP0175635A2
Expired / Lapsed
EP
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High density moisture resistant mica cylinders
Assignee: Essex Solutions USA LLC
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Filing: 1985-09-05
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Granted: —
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Expires: 2005-09-05
Abstract
Abstract High density, moisture resistant, high temperature stable mica tubular structures and methods of making the same are described. The structures comprise one or more mica paper layers impregnated with a polysiloxane binder, said binder containing an organic titanate and a metal naphthenate. Also disclosed are methods for making such tubular mica composite structures by impregnating mica papers with such composition, rolling the impregnated papers into cylindrical form and curing the cylinder.
Inventors
- 👤 Arthur F. Doyle
- 👤 Dennis J. Sklarski
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 04:50
CPC Classifications
B; B31; B31F; B31F1/00; B31F1/0003; B31F1/0045; B31F1/0048; B31F1/0051; B31F1/0054; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/59; H; H01; H01B; H01B19/00; H01B19/02; H01B3/00; H01B3/02; H01B3/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
70 words
A cylindrical mica composite comprising one or more mica paper layers each impregnated with about 5 percent to about 20 percent by weight of a polysiloxane binder, said binder containing about 1 percent to about 4 percent by weight of an organic titanate and about 0.5 percent to about 2 percent by weight of a metal naphthenate, the composite having a high density, fracture toughness, moisture resistance and thermal stability.
Claim 2
Dependent Claim
70 words
A cylindrical mica composite comprising one or more mica paper layers each impregnated with about 5 percent to about 20 percent by weight of a polysiloxane binder, said binder containing about 1 percent to about 4 percent by weight of an organic titanate and about 0.5 percent to about 2 percent by weight of a metal naphthenate, the composite having a high density, fracture toughness, moisture resistance and thermal stability.
Claim 3
Dependent Claim
13 words
The composite of claim 1 wherein the organic titanate is isopropyl tri(dioctylpyrophosphato) titanate.
Claim 4
Dependent Claim
12 words
The composite of claim 2 wherein the metal naphthenate is zinc naphthenate.
Claim 5
Dependent Claim
27 words
The composite of claim 3 wherein the titanate is present at about 2 percent by weight and the naphthenate is present at about 1 percent by weight.
Claim 6
Dependent Claim
20 words
The composite of claim 1 wherein the wall thicknesses of the cylinder is about 0.025 cm. to about 2.54 cm.
Claim 7
Independent Claim
128 words
A method of forming a cylindrical mica structure comprising: forming a mica paper, impregnating the mica paper with a composition comprising about 5 percent to about 20 percent by weight of a polysiloxane binder containing, based on solids, about 1 percent to about 4 percent by weight of an organic titanate and about 0.5 percent to about 2 percent by weight of a metal naphthenate in an organic solvent, heating to remove the solvent, heating the solvent free paper until it is compliant, forming the impregnated mica paper into a cylindrical structure, restraining the structure, heating the cylindrical structure while restrained to cure the polymeric binder, cooling the cylinder, removing the restraint, thus forming a high density, cylindrical mica structure having fracture toughness, moisture resistance and thermal stability.
Claim 8
Independent Claim
128 words
A method of forming a cylindrical mica structure comprising: forming a mica paper, impregnating the mica paper with a composition comprising about 5 percent to about 20 percent by weight of a polysiloxane binder containing, based on solids, about 1 percent to about 4 percent by weight of an organic titanate and about 0.5 percent to about 2 percent by weight of a metal naphthenate in an organic solvent, heating to remove the solvent, heating the solvent free paper until it is compliant, forming the impregnated mica paper into a cylindrical structure, restraining the structure, heating the cylindrical structure while restrained to cure the polymeric binder, cooling the cylinder, removing the restraint, thus forming a high density, cylindrical mica structure having fracture toughness, moisture resistance and thermal stability.
Claim 9
Dependent Claim
25 words
The method of claim 6 wherein the binder impregnated mica paper is densified under pressure and temperature prior to forming it into a cylindrical structure.
Claim 10
Dependent Claim
31 words
The method of claim 8 wherein the densification step takes place at temperatures of about 200°F (93.3°C) to about 275°F (135°C) and pressures of about 6.89 bar to about 31.04 bar.
References Cited (Backward Citations)
No citation records indexed.
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