Tdk Corporation

Shigeki Satou

Takeshi Nomura

Hisashi Kobayashi

Yasumichi Tokuoka

Akira Yamaguchi

Shogo Murosawa

Toru Tonogai

Tomoko Nakamura

Masahiro Karatsu

Syogo Murosawa

Tatsunori Satou

A thick film green sheet slurry, a production method of thick film green sheet slurry, a production method of a thick film green sheet, a thick film green sheet and a production method of an electronic device are provided; by which coating of a relatively thick film becomes possible, a sheet formed after coating has excellent cutting property (strength capable of being cut), and a sheet having high air permeability, excellent handleability and a high adhesive force can be formed. In the present invention, a thick film green sheet slurry comprises a ceramic powder, a binder resin including a butyral based resin as the main component, and a solvent: wherein the solvent includes a good solvent for letting the binder resin dissolved well therein and a poor solvent having lower solubility to the binder resin comparing with that of the good solvent; and the poor solvent is included in a range of 30 to 60 wt % with respect to the entire solvent. The good solvent is alcohol, and the poor solvent may be toluene, xylene, mineral spirit, benzyl acetate, solvent naphtha, etc.

Thick film green sheet slurry, production method of thick film green sheet slurry, production method of thick film green sheet and production methods of thick film green sheet and electronic device

A manufacturing method of ceramic slurry being used for producing a green sheet which can have a smooth surface, exhibits a satisfactory sheet strength, and is excellent in workability such as releasing, a green sheet produced by the use of the slurry produced by the method, and a multilayer ceramic device produced by the use of the green sheet is provided. According to the present invention, a manufacturing method of ceramic slurry at least comprising a ceramic powder and a binder resin solution, wherein a high-pressure dispersing treatment of the ceramic powder and a lacquer for preliminary addition, which is a part of the binder resin solution, is carried out so that a shearing rate is set to 1&#xd7;10to 1&#xd7;10[1/sec] to prepare a preliminary slurry, and at least a lacquer for post-addition, which a high-pressure dispersing treatment is not applied, is added to the preliminary slurry which a high-pressure dispersing treatment is applied.

Manufacturing method of ceramic slurry, green sheet and multilayer ceramic device

A coating material, green sheet and the method capable of producing a green sheet without a pin hole, having enough strength to be peeled from a support body and excellent surface smoothness even when the green sheet is extremely thin, and being suitable to make an electronic device thin and multilayered, are provided. The present invention provides a green sheet coating material comprising a ceramic powder, a binder resin including a butyral based resin as a main component thereof, and a solvent. The solvent includes a first solvent having an SP value as a solubility parameter of 10 or larger and a second solvent having the SP value of 8 or larger but smaller than 10. The second solvent is included by 20 to 60 wt % and, preferably, 25 to 60 wt % with respect to 100 wt % of the solvent as the entire weight.

Green sheet coating material, green sheet, production method of green sheet and production method of electronic device

A production method of an electronic device comprising the steps of forming a stacked body by stacking green sheets and electrode layers having a predetermined pattern and firing the stacked body. Before forming the stacked body, a blank pattern layer is formed on a space portion of the electrode layer having a predetermined pattern. The electrode level difference absorbing print paste for forming the blank pattern layer includes at least ceramic powder and a binder resin, and a polymerization degree of the binder resin is made equal to or more than that of a binder resin included in slurry for forming the green sheet. The binder resin of the electrode level difference absorbing print paste includes polyvinyl butyral resin with a polymerization degree of 1400 or more, a butyralation degree of 64 to 74 mol % and an acetalization degree of 66 to 74 mol %.

Electrode level difference absorbing print paste and method of producing electronic device

A production method of a multilayer ceramic device is provided, by which, for example, a multilayer ceramic capacitor having a large capacity, wherein the interlayer thickness is made as thin as about 2.5 &#x3bc;m or thinner, can be produced at a high production yield without causing unsticking between layers and internal defects. In the present invention, when assuming that a first weight ratio (wt %) of the first organic binder component with respect to a first inorganic dielectric colorant powder in said green sheet slurry for forming a green sheetis (A), and a second weight ratio (wt %) of the second organic binder component with respect to said second inorganic dielectric colorant powder in said electrode level difference absorbing dielectric paste for forming a dielectric blank pattern layeris (B), the second weight ratio (B) is larger than the first weight ratio (A).

Multilayer ceramic device and the production method thereof

It is an object of the present invention to provide a dielectric paste for a spacer layer of a multi-layered ceramic electronic component which 5 does not dissolve a binder contained in a layer adjacent to the spacer layer of the multi-layered ceramic electronic component and can reliably prevent defects from being generated in a multi-layered ceramic electronic component. A dielectric paste for forming a spacer layer according to the 10 present invention contains a butyral system resin as a binder and at least one solvent selected from the group consisting of dihydroterpinyl oxyethanol, terpinyl oxyethanol, d-dihydrocarveol, I-citronellol, I-perillylalcohol and acetoxy-methoxyethoxy-cyclohexanol acetate as a solvent.

Dielectric paste for spacer layer of a multi-layered ceramic electronic component

It is an object of the present invention to provide a method for manufacturing a multilayered unit for a multi-layered ceramic electronic component which can reliably prevent short circuit failure from occurring 5 in a multi-layered ceramic electronic component. According to the present invention, a multi-layered unit for a multi-layered ceramic electronic component is fabricated by printing a conductive paste containing a butyral system resin as a binder and at least one solvent selected from a group consisting of dihydroterpinyl oxyethanol, terpinyl oxyethanol, d-dihydrocarveol, I-citronellol, I-perillylalcohol and acetoxy-methoxyethoxy-cyclohexanol acetate as a solvent on a ceramic green sheet containing an acrylic system resin as a binder in a predetermined pattern, thereby forming an electrode layer.

Conductive paste for an electrode layer of a multi-layered ceramic electronic component and a method for manufacturing a multi-layered unit for a multi-layered ceramic electronic component

It is an object of the present invention to provide a method for manufacturing a multi-layered unit for a multi-layered ceramic electronic component which can reliably prevent short circuit failure from occurring in a multi-layered ceramic electronic component and form an electrode layer in a desired manner. A method for manufacturing a multi-layered ceramic electronic component includes a step of printing a conductive paste containing a binder containing ethyl cellulose having a weight average molecular weight of MWand ethyl cellulose having a weight average molecular weight of MWat a weight ratio of X:(1&#x2212;X), where MW, MWand X are selected so that X*MW+(1&#x2212;X)*MWfalls within a range of 145,000 to 215,000 and at least one solvent selected from the group consisting of isobornyl acetate, dihydroterpinyl methyl ether, dihydroterpinyl oxyethanol, terpinyl methyl ether, terpinyl oxyethanol, d-dihydrocarveol, I-menthyl acetate, I-citronellol, I-perillylalcohol and acetoxy-methoxyethoxy-cyclohexanol acetate on a ceramic green sheet containing an acrylic system resin as a binder in a predetermined pattern, thereby forming an electrode layer.

Conductive paste for a multi-layered ceramic electronic component and a method for manufacturing a multi-layered unit for a multi-layered ceramic electronic component

It is an object of the present invention to provide a method for manufacturing a multi-layered unit for a multi-layered ceramic electronic component which can reliably prevent short circuit failure from occurring in a multi-layered ceramic electronic component and form an electrode layer in a desired manner. A method for manufacturing a multi-layered ceramic electronic component includes a step of printing a conductive paste containing a binder containing ethyl cellulose having a weight average molecular weight of MWand ethyl cellulose having a weight average molecular weight of MWat a weight ratio of X:(1&#x2212;X), where MW, MWand X are selected so that X*MW+(1&#x2212;X)*MWfalls within a range of 145,000 to 215,000 and at least one solvent selected from the group consisting of isobornyl acetate, dihydroterpinyl methyl ether, terpinyl methyl ether, &#x3b1;-terpinyl acetate, I-dihydrocarvyl acetate, I-menthone, I-menthyl acetate, I-perillyl acetate and I-carvyl acetate on a ceramic green sheet containing a butyral system resin as a binder in a predetermined pattern, thereby forming an electrode layer.

A release layeris formed on a surface of a first supporting sheetNext, an electrode layeris formed on a surface of the release layerWhen the electrode layeris pressed against a surface of a green sheetto bond the electrode layerwith the green sheetan adhesive layeris formed by a transfer method on a surface of the electrode layeror a surface of the green sheetIt becomes possible to easily transfer a dry type electrode layer to the surface of the green sheet with high accuracy without breaking or deforming the green sheet, moreover, components of the adhesive layer do not soak in the electrode layer or green sheet. Also, the supporting sheet is extremely easily released, and a production cost of a multilayer ceramic capacitor is reduced.

Production method of electronic device having internal electrode

At the time of pressing an electrode layeragainst a surface of a green sheethaving a thickness of 3 &#x3bc;m or thinner to bond the electrode layerwith the surface of the green sheet, an adhesive layerhaving a thickness of 0.02 to 0.3 &#x3bc;m is formed on a surface of the electrode layeror the surface of the green sheet. It is possible to easily transfer a dry type electrode layer to the surface of the green sheet with high accuracy without breaking or deforming the green sheet.

Production method of multilayer electronic device

An internal electrode paste comprises electrode material powder, a binder resin containing a polyvinyl butyral resin as the main component, and a solvent. The internal electrode paste furthermore comprises a plasticizer, and the plasticizer is contained by 25 parts by weight or more and 150 parts by weight or less with respect to 100 parts by weight of the binder resin. The binder resin is contained by 2.5 to 5.5 parts by weight with respect to 100 parts by weight of the electrode material powder. It is possible to provide an internal electrode paste having enough strength and an adhesive force for the dry transfer method, and a production method of an electronic device using the paste.

Internal electrode paste and production method of electronic device

A method of stacking a green sheet, where, in rolling up a support sheet on which a multilayer unit including a green sheet and/or electrode layer is formed, the multilayer unit can be easily unrolled without adhering to the back surface of the support sheet, and in stacking the multilayer unit, the support sheet can be easily separated from the multilayer unit. On the surfaceof the support sheetis stacked a multilayer unit Ucomposed of an electrode layerand/or green sheetto form the support sheet with the laminated unit. Then, the support sheetwith the laminated unit is rolled up to form a rolled body R. The rolled body R is unrolled, the support sheetwith the multilayer unit is placed on a layer on which the support sheet is to be placed, the support sheetis separated from the laminated unit U, and the laminated unit Uis stacked. On the back surfaceof the support sheetis applied separation-facilitating surface treatment with a width equal to or greater than the width of the multilayer unit Uand an adhereable portionwhere the separation-facilitating surface treatment is not applied is also formed on the back face

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Chuo-ku, Japan

Shigeki Satou