Thin tape for dielectric materials

Claim 2

A green ceramic precursor tape which comprises a free-standing, flexible layer having a thickness not greater than about 25 microns and prepared from a slip composition having: (a) a dielectric component in an amount sufficient to provide the resulting thin film with the desired dielectric properties; (b) a binder comprising at least one alkylcellulose ether or hydroxyalkylcellulose ether in an amount sufficient to bind the dielectric material into the thin film upon the removal of the solvent; and (c) a solvent in an amount sufficient to solubilize the dielectric component and the binder and to provide the slip composition with the viscosity required to form the thin film.

Claim 3

A tape of claim 1 wherein the dielectric component is barium titanate.

Claim 4

A tape of claim 1 wherein the alkylcellulose ether is ethylcellulose.

Claim 5

A tape of claim 3 wherein the ethylcellulose has an ethoxyl content of from 44 to 53 weight percent and the viscosity is greater than about 40 centipoise.

Claim 6

A tape of claim 4 wherein the ethylcellulose has an ethoxyl content of from 44 to about 50 weight percent and the viscosity is greater than about 40 centipoise.

Claim 7

A tape of claim 5 wherein the ethoxyl content is from 48 to about 49.5 weight percent and the viscosity is from 40 to about 60 centipoise, the viscosity being that of a 5 weight percent solution measured at 25° C. in an Ubbelohde viscometer with a solvent which is 80 weight percent toluene and 20 weight percent ethanol.

Claim 8

A tape of claim 6 wherein the ethylcellulose is ETHOCEL® 45 brand ethylcellulose.

Claim 9

A tape of claim 5 wherein the ethoxyl content is from about 48 to about 49.5 weight percent and the viscosity is from about 90 to about 110 centipoise, the viscosity being that of a 5 weight percent solution measured at 25° C. in an Ubbelohde viscometer with a solvent which is 80 weight percent toluene and 20 weight percent ethanol.

Claim 10

A tape of claim 8 wherein the ethylcellulose is ETHOCEL® 100 brand ethylcellulose.

Claim 11

A tape of claim 4 having a thickness of from about 5 to about 10 microns.

Claim 12

A tape of claim 1 wherein the slip contains a wetting agent or surfactant.

Claim 13

A tape of claim 1 wherein the slip contains a plasticizer.

Claim 14

A capacitor prepared using a flexible, free-standing green tape having a thickness not greater than 25 microns, the green tape being prepared from a slip comprising: (a) a dielectric component in an amount sufficient to provide the resulting thin film with the desired dielectric properties; (b) a binder comprising at least one alkylcellulose ether or hydroxyalkylcellulose ether in an amount sufficient to bind the dielectric material into the thin film upon removal of the solvent; and (c) a solvent in an amount sufficient to solubilize the dielectric component and the binder and to provide the slip composition with the viscosity required to form the thin film.

Claim 15

A capacitor prepared using a flexible, free-standing green tape having a thickness not greater than 25 microns, the green tape being prepared from a slip comprising: (a) a dielectric component in an amount sufficient to provide the resulting thin film with the desired dielectric properties; (b) a binder comprising at least one alkylcellulose ether or hydroxyalkylcellulose ether in an amount sufficient to bind the dielectric material into the thin film upon removal of the solvent; and (c) a solvent in an amount sufficient to solubilize the dielectric component and the binder and to provide the slip composition with the viscosity required to form the thin film.

Claim 16

A capacitor of claim 13 wherein the cellulosic resin is ethylcellulose.

Claim 17

A capacitor prepared using a flexible, free-standing green tape having a thickness not greater than 25 microns, the green tape being prepared from a slip comprising: (a) a dielectric component of barium titanate in an amount sufficient to provide the resulting thin film with the desired dielectric properties; (b) a binder of ethylcellulose in an amount sufficient to bind the dielectric material into the thin film upon removal of the solvent; the ethylcellulose having an ethoxyl content of from about 48 to about 49.5 weight percent and a viscosity from about 40 to about 60 centipoise, the viscosity being that of a 5 weight percent solution measured at 25° C. in an Ubbelohde viscometer with a solvent which is 80 percent toluene and 20 weight percent ethanol; and (c) a solvent in an amount sufficient to solubilize the dielectric component and the binder and to provide the slip composition with the viscosity required to form the thin film.

Claim 18

A capacitor prepared using a flexible, free-standing green tape having a thickness not greater than 25 microns, the green tape being prepared from a slip comprising: (a) a dielectric component of barium titanate in an amount sufficient to provide the resulting thin film with the desired dielectric properties; (b) a binder of ethylcellulose in an amount sufficient to bind the dielectric material into the thin film upon removal of the solvent; the ethylcellulose having an ethoxyl content of from about 48 to about 49.5 weight percent and a viscosity from about 40 to about 60 centipoise, the viscosity being that of a 5 weight percent solution measured at 25° C. in an Ubbelohde viscometer with a solvent which is 80 percent toluene and 20 weight percent ethanol; and (c) a solvent in an amount sufficient to solubilize the dielectric component and the binder and to provide the slip composition with the viscosity required to form the thin film.

Claim 19

A capacitor prepared using a flexible, free-standing green tape having a thickness not greater than 25 microns, the green tape being prepared from a slip comprising: (a) a dielectric component comprising barium titanate in an amount sufficient to provide the resulting thin film with the desired dielectric properties; (b) a binder comprising ethylcellulose in an amount sufficient to bind the dielectric material into the thin film upon removal of the solvent; the ethylcellulose having an ethoxyl content of from about 48 to about 49.5 weight percent and a viscosity from about 90 to about 110 centipoise, the viscosity being that of a 5 weight percent solution measured at 25° C. in an Ubbelohde viscometer with a solvent which is 80 weight percent toluene and 20 weight percent ethanol; and (c) a solvent in an amount sufficient to solubilize the dielectric component and the binder and to provide the slip composition with the viscosity required to form the thin film.

Claim 20

A capacitor prepared using a flexible, free-standing green tape having a thickness not greater than 25 microns, the green tape being prepared from a slip comprising: (a) a dielectric component comprising barium titanate in an amount sufficient to provide the resulting thin film with the desired dielectric properties; (b) a binder comprising ethylcellulose in an amount sufficient to bind the dielectric material into the thin film upon removal of the solvent; the ethylcellulose having an ethoxyl content of from about 48 to about 49.5 weight percent and a viscosity from about 90 to about 110 centipoise, the viscosity being that of a 5 weight percent solution measured at 25° C. in an Ubbelohde viscometer with a solvent which is 80 weight percent toluene and 20 weight percent ethanol; and (c) a solvent in an amount sufficient to solubilize the dielectric component and the binder and to provide the slip composition with the viscosity required to form the thin film.

Claim 21

A green ceramic precursor tape which comprises a free-standing, flexible unsupported layer having a thickness of from 5 to 18 microns and prepared from a slip composition having: (a) a dielectric component in an amount sufficient to provide the resulting thin film with the desired dielectric properties; (b) a binder having at least one cellulosic resin in an amount sufficient to bind the dielectric material into the thin film upon removal of the solvent; and (c) a solvent in an amount sufficient to solubilize the dielectric component and the binder and to provide the slip composition with the viscosity required to form the thin film.

Claim 22

A green ceramic precursor tape which comprises a free-standing, flexible unsupported layer having a thickness of from 5 to 18 microns and prepared from a slip composition having: (a) a dielectric component in an amount sufficient to provide the resulting thin film with the desired dielectric properties; (b) a binder having at least one cellulosic resin in an amount sufficient to bind the dielectric material into the thin film upon removal of the solvent; and (c) a solvent in an amount sufficient to solubilize the dielectric component and the binder and to provide the slip composition with the viscosity required to form the thin film.

Claim 23

A tape of claim 17 having a thickness of from about 5 to about 10 microns.

Claim 24

A capacitor prepared using a flexible, free-standing green unsupported tape having a thickness of from 5 to 18 microns, the green tape being prepared from a slip comprising: (a) a dielectric component in an amount sufficient to provide the resulting thin film with the desired dielectric properties; (b) a binder having at least one cellulosic resin in an amount sufficient to bind the dielectric material into the thin film upon removal of the solvent; and (c) a solvent in an amount sufficient to solubilize the dielectric component and the binder and to provide the slip composition with the viscosity required to form the thin film.

Claim 25

A capacitor prepared using a flexible, free-standing green unsupported tape having a thickness of from 5 to 18 microns, the green tape being prepared from a slip comprising: (a) a dielectric component in an amount sufficient to provide the resulting thin film with the desired dielectric properties; (b) a binder having at least one cellulosic resin in an amount sufficient to bind the dielectric material into the thin film upon removal of the solvent; and (c) a solvent in an amount sufficient to solubilize the dielectric component and the binder and to provide the slip composition with the viscosity required to form the thin film.