KR20090009157A - Green sheet - Google Patents

Abstract

A green sheet is provided to ensure excellent releasability from a sheet or film, bindability, plasticity and surface quality without concavo-convex, crack, or wrinkle. A green sheet comprises a mixed solvent consisting of a low-boiling point solvent having a boiling point of 100°C or less and a high-boiling point having a boiling point of 100°C or more; a binder; and powder. The difference between the low-boiling point and the high-boiling point is over 10°C.

Description

Green Sheet {GREEN SHEET}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a green sheet used for an electronic circuit or a substrate material of a laminated electronic component, a manufacturing method thereof, and a slurry composition for forming a green sheet used in the same.

The green sheet is a material of various electronic components by printing a metal paste, a metal ink, or the like to form a circuit and baking. In particular, it is widely used in multilayer circuit boards, multilayer capacitors, resistors, inductors, etc., which are laminated by firing a plurality of green sheets.

Generally, a green sheet is manufactured by peeling from a film after coating and drying the slurry obtained by mixing powders, such as ceramics, a resin binder, a solvent, a plasticizer, etc. on a film.

In addition, the green sheet is sintered to form an electronic circuit to form a ceramic substrate. There are low temperature co-fired ceramics (LTCC) and high temperature co-fired ceramics (HTCC) according to the firing conditions. Both are formed by baking the resin binder and the ceramic material into a green sheet. At the time of baking, the binder is evaporated, and the ceramic powder is sintered to form a plate-like substrate. Particularly, since LTCC can be formed at a low temperature of 900 ° C. or lower, circuit formation can be performed. Therefore, it is possible to perform metal wiring having good conductivity such as silver and copper.

In addition, by stacking the wired LTCCs in multiple layers, various circuits can be formed in the substrate, or the electronic components such as resistors and inductors can be used.

Patent Document 1 (Japanese Patent Laid-Open No. S63 (1988) -50361) discloses forming a green sheet using a slurry obtained by mixing a solvent, a binder, a surfactant, and a plasticizer.

In patent document 2 (Unexamined-Japanese-Patent No. H4 (1992) -317453), the kind of dispersing agent used for a green sheet is examined.

Moreover, in patent document 3 (Unexamined-Japanese-Patent No. H9 (1997) -157032), a solvent and surfactant are examined.

However, in these green sheets, it is a problem that irregularities, cracks, and wrinkles appear on the surface.

[Patent Document 1] Japanese Patent Laid-Open No. S63 (1988) -50361

[Patent Document 2] Japanese Patent Laid-Open No. H4 (1992) -317453

[Patent Document 3] Japanese Patent Application Laid-Open No. H9 (1997) -157032

An object of the present invention is to provide a green sheet having excellent bonding properties, plasticity, and peelability from a sheet or film used in production, and excellent in surface properties without irregularities, cracks, and wrinkles.

The above object of the present invention is achieved by the contents described below.

(1) A slurry composition for forming a green sheet, comprising a mixed solvent, a binder, and a powder containing a low boiling point solvent having a boiling point of less than 100 ° C. and a high boiling point solvent having a boiling point of 100 ° C. or more.

(2) The slurry composition for green sheet formation as described in said (1) characterized by the difference in boiling point of the said low boiling point solvent and the said high boiling point solvent being 10 degreeC or more.

(3) The method for producing a green sheet, wherein the sheet or film is peeled off after coating and drying the slurry composition for green sheet formation according to (1) or (2) on a sheet or a film.

(4) A green sheet obtained by the production method described in (3) above, containing a binder and a powder.

According to the present invention, a green sheet having good bonding property, plasticity, and peelability from a sheet or film used in production, and excellent in surface properties without irregularities, cracks and wrinkles can be obtained.

Hereinafter, the present invention will be described in more detail.

In the present invention, a slurry composition for forming a green sheet (hereinafter, simply referred to as "slurry") containing a mixed solvent, a binder, and a powder containing a low boiling point solvent having a boiling point of less than 100 ° C. and a high boiling point solvent having a boiling point of 100 ° C. or more is prepared. After coating and drying on a film or film, it is peeled off the sheet or film to obtain a green sheet.

<Mixed solvent>

MEANS TO SOLVE THE PROBLEM This inventor paid attention to the combination of a solvent in order to overcome the said subject. However, even when various solvents were combined, when the boiling points were high and the boiling point was small, it was found that during the drying process of the green sheet, the slurry enlarged during the drying process and did not become thick or cause surface wrinkles. Moreover, when each boiling point was low and the boiling point difference was small, it discovered that dryness is quick, it is easy to produce an unevenness | corrugation on the surface, and it becomes a cause of a crack because of quick drying on the surface. In order to solve this problem, in the present invention, by combining one or more solvents having a high boiling point (100 ° C. or higher) and a low boiling point (less than 100 ° C.), a green sheet having good surface properties and a uniform film thickness can be obtained. Developed.

That is, in this invention, the mixed solvent containing the low boiling point solvent whose boiling point is less than 100 degreeC, and the high boiling point solvent whose boiling point is 100 degreeC or more is used.

In particular, it is preferable that the boiling point difference between a low boiling point solvent and a high boiling point solvent is 10 degreeC or more, and it is more preferable that it is 20 degreeC or more. In the case where a plurality of low boiling point solvents and a high boiling point solvent are respectively used, the boiling point difference between the lowest boiling point solvent and the highest boiling point solvent among the high boiling point solvents is 10 ° C or more, more preferably 20 ° C or more. do.

It is preferable that the solvent used is compatible with the binder to be used.

Although the low boiling point solvent whose boiling point is less than 100 degreeC is not specifically limited, From an viewpoint of the solubility of a binder, etc., an organic solvent is used preferably. For example, ethyl acetate, acetone, methyl ethyl ketone, methanol, ethanol, isopropanol, tetrahydrofuran, cyclohexane, etc. are mentioned. These may be used independently, or may mix and use multiple.

Although the high boiling point solvent whose boiling point is 100 degreeC or more is not specifically limited, From an viewpoint of the solubility of a binder, etc., an organic solvent is used preferably. For example, methyl isobutyl ketone (MIBK), ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, butyl acetate, cyclohexanone, ethylene glycol monoethyl ether acetate (BCA), N, N-dimethyl Formamide and the like. These may be used independently, or may mix and use multiple.

The mixing ratio of the low boiling point solvent and the high boiling point solvent in the mixed solvent (mixing ratio in the total amount when using a plurality of solvents each) is 10 to 90% by mass of the low boiling point solvent, more preferably 20 to 80% by mass, The point solvent is 10 to 90 mass%, more preferably 20 to 80 mass%. That is, the low boiling point solvent: the high boiling point solvent (mass ratio) is preferably 1: 9 to 9: 1, more preferably 2: 8 to 8: 2.

In addition, the content of the mixed solvent in the slurry is 40% by mass or less and 5% by mass or more, preferably 35% by mass or less and 5% by mass or more in view of ease of drying, film thickness, workability, and the like.

<Binder>

As the binder, various binders usually used in this field can be used. For example, various resins such as acrylic resin, acrylic resin ester, methacryl resin, methacryl resin ester, urethane resin, vinyl resin (PVB), styrene resin and polyester resin can be used. These may be used independently, or may mix and use multiple. As the green sheet for LTCC (low temperature calcined ceramic), an acrylic resin in which ash at low temperatures does not remain is preferable.

In addition, these binders may mix | blend a polymer (powder) of a polymer with the slurry for green sheet formation, and can also mix | blend from the state of a low molecule (monomer).

The binder is preferably 3 to 70 mass%, more preferably 5 to 40 mass%, based on the total amount of the slurry.

<Powder>

The powder is not particularly limited, and various powders such as metals and ceramics that are commonly used in this field may be used, and ceramic powders are particularly preferable. For example, glass powder, alumina powder, zirconia, zircon, titania, Various powders such as magnesia, mullite, cristobalite, forsterite, cordierite, enstatite, ganite, quartz, aluminum nitride earth salts such as aluminum nitride and barium titanate can be used. have. These may be used independently, or may mix and use multiple.

The powder is preferably 50 to 95% by mass, more preferably 70 to 90% by mass relative to the total amount of the slurry.

<Plasticizer>

It is preferable that a slurry contains a plasticizer. The plasticizer facilitates lamination compression of the green sheet by lowering the glass transition point of the binder. The kind of plasticizer is not specifically limited, Various plasticizers normally used in this field can be used. It is preferable that it is high boiling point (preferably boiling point 300 degreeC or more) and low vapor pressure from a viewpoint of affinity with a binder, For example, diethyl phthalate, dibutyl phthalate, dioctyl phthalate (DOP), butyl benzyl phthalate, Adipic acid bis 2-ethylhexyl (DOA), ethylene glycol, a polyester plasticizer, etc. are preferable. These may be used independently, or may mix and use multiple.

The plasticizer is preferably 1 to 30% by mass, more preferably 2 to 15% by mass, based on the total amount of the slurry.

<Surfactant>

The slurry also preferably contains a surfactant. The surfactant increases the dispersibility of the powder. The kind of surfactant is not specifically limited, Polycarboxylic acid type | system | group, nonionic system, ester type nonionic system, such as various surfactant, polycarboxylic acid ammonium salt, polycarboxylic acid amine salt normally used in this field, Surfactant etc. can be used, Especially, when using the ceramic powder which consists of silicon, alumina, boron, an alkali metal, alkaline earth metal etc. as a powder, a nonionic surfactant is suitable.

For example, alkylbenzene sulfonate, alkyl phosphate ester salt, polyoxyethylene alkyl sulfate ester salt, polyoxyethylene alkyl ether, sorbitan fatty acid ester, alkyl amine salt, alkyl betaine, polyhydric alcohol type, etc. can be used, Commercially available surfactants can also be used.

The surfactant is preferably contained in an amount of 0.1 to 20% by mass, and more preferably 0.5 to 10% by mass, based on the total amount of the slurry.

<Other additives>

In addition to the above, a slurry can contain an antifoamer, a thickener, a pigment, etc. suitably. These may all be known.

<Slurry preparation method>

Preparation of the slurry can be carried out in the same manner as usual. For example, a low boiling point solvent and a high boiling point solvent may be mixed in a predetermined ratio to form a mixed solvent, and then powders, binders, plasticizers, surfactants, and other additives may be sequentially or simultaneously added as necessary, followed by stirring and mixing in a ball mill or the like. .

In addition, in consideration of coating property, shape retention property after coating, etc., it is preferable that the viscosity in 20 degreeC is 1000-10000cps, and it is more preferable that it is 2000-8000cps. The viscosity can be adjusted according to the amount of the mixed solvent.

<Production of Green Sheet>

In order to manufacture the green sheet using the slurry, it can be carried out as usual. For example, the slurry may be coated on a sheet or film using a bar coater or the like to adjust the film thickness, and then left at room temperature for several hours to several ten hours to evaporate the mixed solvent and then peel the sheet or film. Moreover, the slurry film thickness at the time of coating is selected according to the specification of the green sheet obtained by drying.

EXAMPLE

Hereinafter, although an Example and a comparative example are given and this invention is made clear, this invention is not restrict | limited by this.

(Example 1)

100 g of alumina borosilicate glass powder (manufactured by Matsunami Glass Ind., Ltd.) and a polyhydric alcohol having a mean particle size of 2.5 µm in a mixed solvent of low boiling point (77 ° C.) solvent ethyl acetate 30 g and high boiling point (120 ° C.) solvent MIBK 15 g 2 g of a system dispersant SN70 (manufactured by SAN NOPCO LIMITED) was added thereto, followed by stirring and mixing in a ball mill for 1 hour to obtain dispersion 1. 10 g of acrylic resin YB-881S (manufactured by Yuken Industries Co., Ltd.) and 3 g of DOA (manufactured by DAIHACHI CHEMICAL INDUSTRY CO., LTD.) Were added to dispersion 1 of the ball mill, and the mixture was further mixed for 24 hours to obtain slurry 1. . The viscosity at 20 ° C. of the slurry was 3400 cps.

The slurry 1 was coated on a lumina film (trade name) so as to have a thickness of 0.6 mm (the same as in Examples and Comparative Examples below) using a bar coater, and dried at 20 ° C. for 8 hours to obtain green sheet GS1.

As shown in the table, the properties of GS1 were evaluated by vibrating up and down while holding both ends of the sheet with both hands for binding, but did not cause cracks or the like. The plasticity was evaluated by bending it at about 150 degrees, and no crack was generated, and the original state was returned. Although peelability was evaluated by peeling by hand about a peelability, it was easy to peel. The surface properties were evaluated by the presence or absence of irregularities, cracks, and wrinkles of 0.01 mm or more on the surface, but these were not observed. Very good in all evaluations.

(Comparative Example 1)

To 45 g of ethyl acetate having a low boiling point (77 ° C.), 100 g of alumina borosilicate glass powder (manufactured by Matsunami Glass Ind., Ltd.) with an average particle diameter of 2.5 μm and 2 g of a nonionic dispersant SN70 (manufactured by SAN NOPCO LIMITED) were added for 1 hour. While stirring in a ball mill to obtain dispersion 2. 10 g of acrylic resin YB-881S (produced by Yuken Industries Co., Ltd.) and 3 g of DOA (produced by DAIHACHI CHEMICAL INDUSTRY CO., LTD.) Were added to dispersion 2 of the ball mill, and further mixed for 24 hours to obtain slurry 2. . The viscosity at 20 ° C. of the slurry 2 was 1700 cps.

The slurry 2 was coated on a lumina film using a bar coater and dried at 20 ° C. for 8 hours to obtain green sheet GS2.

As shown in the table, the properties of GS2 were not good in plasticity, and cracks occurred due to bending of the green sheet.

(Comparative Example 2)

To a high boiling point (120 ° C) solvent MIBK 45g, 100 g of alumina borosilicate glass powder (manufactured by Matsunami Glass Ind., Ltd.) with an average particle diameter of 2.5 µm and 2 g of nonionic dispersant SN70 (manufactured by SAN NOPCO LIMITED) were added for 1 hour. Stir and mix to obtain dispersion 3. 10 g of acrylic resin YB-881S (manufactured by Yuken Industries Co., Ltd.) and 3 g of DOA (manufactured by DAIHACHI CHEMICAL INDUSTRY CO., LTD.) Were added to the dispersion 3 in the ball mill, and the mixture was further mixed for 24 hours to obtain a slurry 3. . The viscosity at 20 ° C. of the slurry was 2500 cps.

The slurry 3 was coated on a lumina film using a bar coater and dried at 20 ° C. for 8 hours to obtain green sheet GS3.

As shown in the table, the properties of GS3 were not good in peelability, the green sheet was hard to peel off from the lumina film, and several cracks of about 5 cm were generated.

(Example 2)

100 g of alumina borosilicate glass powder (manufactured by Matsunami Glass Ind., Ltd.) with an average particle diameter of 2.5 µm in a mixed solvent of 14 g of solvent acetone having a low boiling point (57 ° C.) and 31 g of solvent ethyl cellosolve having a high boiling point (135 ° C.); 2 g of a nonionic dispersant SN70 (manufactured by SAN NOPCO LIMITED) was added and stirred and mixed in a ball mill for 1 hour to obtain dispersion 4. 10 g of acrylic resin YB-881S (produced by Yuken Industries Co., Ltd.) and 3 g of DOA (produced by DAIHACHI CHEMICAL INDUSTRY CO., LTD.) Were added to the dispersion 4 in the ball mill, and further mixed for 24 hours to obtain a slurry 4. The viscosity at 20 ° C. of the slurry was 2000 cps.

The slurry 4 was coated on a lumina film using a bar coater and dried at 20 ° C. for 8 hours to obtain green sheet GS4.

The properties of the GS4 were very good as shown in the table.

(Comparative Example 3)

To 45 g of solvent acetone having a low boiling point (57 ° C.), 100 g of alumina borosilicate glass powder (manufactured by Matsunami Glass Ind., Ltd.) with an average particle diameter of 2.5 μm and 2 g of nonionic SN70 (manufactured by SAN NOPCO LIMITED) were added and ball milled for 1 hour. The mixture was stirred and mixed to obtain a dispersion (5). 10 g of acrylic resin YB-881S (manufactured by Yuken Industries Co., Ltd.) and 3 g of DOA (manufactured by DAIHACHI CHEMICAL INDUSTRY CO., LTD.) Were added to the dispersion 5 in the ball mill, and the mixture was further mixed for 24 hours to obtain a slurry 5. . The viscosity at 20 ° C. of the slurry was 1700 cps.

The slurry 5 was coated on a mylar film using a bar coater and dried at 20 ° C. for 8 hours to obtain green sheet GS5.

As shown in the table, the plasticity and surface properties of the GS5 are not good, cracks are generated by bending the green sheet, and wrinkles are formed on the surface.

(Comparative Example 4)

To 45 g of a high boiling point (135 ° C.) solvent ethyl cellosolve, 100 g of alumina borosilicate glass powder (manufactured by Matsunami Glass Ind., Ltd.) with an average particle diameter of 2.5 μm and 2 g of nonionic dispersant SN70 (manufactured by SAN NOPCO LIMITED) are added. And stirred for 1 hour to obtain a dispersion 6. 10 g of acrylic resin YB-881S (produced by YUKEN INDUSTRY CO., LTD.) And 3 g of DOA (produced by DAIHACHI CHEMICAL INDUSTRY CO., LTD.) Were added to the dispersion 6 in the ball mill, and further mixed for 24 hours to obtain a slurry 6. . The viscosity at 20 ° C. of the slurry was 2500 cps.

The slurry 6 was coated on a lumina film using a bar coater and dried at 20 ° C. for 8 hours to obtain green sheet GS6.

As shown in the table, the properties of the GS6 were poor in peelability, the green sheet was hard to peel off from the lumina film, and cracks occurred.

(Example 3)

100 g of alumina borosilicate glass powder (manufactured by Matsunami Glass Ind., Ltd.) with an average particle diameter of 2.5 µm in a mixed solvent of 8 g of solvent methyl ethyl ketone having a low boiling point (80 ° C.) and 12 g of butyl acetate having a high boiling point (123 ° C.); 1 g of a polyhydric alcohol-based dispersant SN (manufactured by SAN NOPCO LIMITED) was added thereto, followed by stirring and mixing in a ball mill for 1 hour to obtain a dispersion 7. 25 g of acrylic resin G50 (manufactured by GOO CHEMICAL CO., LTD) and 3 g of DOA (manufactured by DAIHACHI CHEMICAL INDUSTRY CO., LTD) were added to the dispersion 7 in the ball mill, and further mixed for 24 hours to obtain a slurry 7. The viscosity at 20 ° C. of the slurry 7 was 4800 cps.

The slurry 7 was coated on a lumina film using a bar coater and dried at 20 ° C. for 8 hours to obtain green sheet GS7.

The properties of the GS7 were very good as shown in the table.

(Example 4)

Alumina borosilicate glass having an average particle diameter of 2.5 μm in a mixed solvent consisting of 6 g of solvent methyl ethyl ketone having a low boiling point (80 ° C.), 6 g of solvent butyl acetate having a high boiling point (123 ° C.), and 12 g of solvent cyclohexanone having a high boiling point (156 ° C.) 100 g of powder (manufactured by Matsunami Glass Ind., Ltd.) and 1 g of a polyhydric alcohol-based dispersant SN (manufactured by SAN NOPCO LIMITED) were added and stirred and mixed in a ball mill for 1 hour to obtain a dispersion 8. 25 g of acrylic resin G50 (manufactured by GOO CHEMICAL CO., LTD) and 3 g of DOA (manufactured by DAIHACHI CHEMICAL INDUSTRY CO., LTD) were added to the dispersion 8 in the ball mill, and the mixture was further mixed for 24 hours to obtain a slurry 8. The viscosity at 20 ° C. of the slurry 8 was 4800 cps.

 The slurry 8 was coated on a lumina film using a bar coater and dried at 20 ° C. for 8 hours to obtain green sheet GS8.

The properties of the GS8 were very good as shown in the table.

(Example 5)

100 g of alumina borosilicate glass powder (manufactured by Matsunami Glass Ind., Ltd.) with an average particle diameter of 2.4 μm in a mixed solvent of 10 g of solvent methyl ethyl ketone having a low boiling point (80 ° C.) and 10 g of butyl acetate having a high boiling point (123 ° C.); 1 g of a polyhydric alcohol-based dispersant SN (manufactured by SAN NOPCO LIMITED) was added and stirred and mixed in a ball mill for 1 hour to obtain a dispersion 9. 25 g of acrylic resin G50 (manufactured by GOO CHEMICAL CO., LTD) and 3 g of DOA (manufactured by DAIHACHI CHEMICAL INDUSTRY CO., LTD) were added to the dispersion 9 in the ball mill, and the mixture was further mixed for 24 hours to obtain a slurry 9. The viscosity at 20 ° C. of the slurry 9 was 3900 cps.

The slurry 9 was coated on a lumina film using a bar coater and dried at 20 ° C. for 8 hours to obtain green sheet GS9.

The properties of GS9 were very good as shown in the table.

(Example 6)

Alumina borosilicate glass having an average particle diameter of 2.4 μm in a mixed solvent consisting of 10 g of solvent methyl ethyl ketone having a low boiling point (80 ° C.), 8 g of solvent butyl acetate having a high boiling point (123 ° C.), and 12 g of solvent cyclohexanone having a high boiling point (156 ° C.) 100 g of powder (manufactured by Matsunami Glass Ind., Ltd.) and 2 g of polyhydric alcohol-based SN70 (manufactured by SAN NOPCO LIMITED) were added thereto, followed by stirring and mixing in a ball mill for 1 hour to obtain a dispersion 10. 25 g of acrylic resin G50 (manufactured by GOO CHEMICAL CO., LTD) and 3 g of DOA (manufactured by DAIHACHI CHEMICAL INDUSTRY CO., LTD) were added to the dispersion 10 in the ball mill, and further mixed for 24 hours to obtain a slurry 10. The viscosity at 20 ° C. of the slurry 10 was 3900 cps.

 The slurry 10 was coated on a lumina film using a bar coater and dried at 20 ° C. for 8 hours to obtain green sheet GS10.

The properties of the GS10 were very good as shown in the table.

(Example 7)

100 g of alumina borosilicate glass powder (manufactured by Matsunami Glass Ind., Ltd.) with an average particle diameter of 2.4 μm in a mixed solvent of 15 g of solvent isopropyl alcohol having a low boiling point (83 ° C.) and 15 g of butyl acetate having a high boiling point (123 ° C.); 2 g of a polyhydric alcohol-based dispersant SN (manufactured by SAN NOPCO LIMITED) was added and stirred and mixed in a ball mill for 1 hour to obtain a dispersion 11. 25 g of acrylic resin G50 (manufactured by GOO CHEMICAL CO., LTD) and 4 g of DOA (manufactured by DAIHACHI CHEMICAL INDUSTRY CO., LTD) were added to the dispersion 11 in the ball mill, and the mixture was further mixed for 24 hours to obtain a slurry 11. The viscosity at 20 ° C. of the slurry was 2800 cps.

The slurry 11 was coated on a lumina film using a bar coater and dried at 20 ° C. for 8 hours to obtain green sheet GS11.

The properties of GS11 were very good as shown in the table.

(Comparative Example 5)

To 43 g of high boiling point (135 ° C.) solvent ethyl cellosolve, 100 g of alumina borosilicate glass powder (manufactured by Matsunami Glass Ind., Ltd.) having an average particle diameter of 2.4 µm and 2 g of a polyhydric alcohol-based dispersant SN (manufactured by SAN NOPCO LIMITED) are added. And stirred and mixed for 1 hour to obtain a dispersion 12. 25 g of acrylic resin G50 (manufactured by GOO CHEMICAL CO., LTD) and 3 g of DOA (manufactured by DAIHACHI CHEMICAL INDUSTRY CO., LTD) were added to the dispersion 12 in the ball mill, and further mixed for 24 hours to obtain a slurry 12. The viscosity at 20 ° C. of the slurry was 2900 cps.

The slurry 12 was coated on a lumina film using a bar coater and dried at 20 ° C. for 8 hours to obtain green sheet GS12.

As shown in the table, the properties of the GS12 was poor in peelability, so that the green sheet was hardly peeled off from the lumina film, and four cracks having a length of 3-5 cm were formed in the center part.

(Comparative Example 6)

100 g of alumina borosilicate glass powder (manufactured by Matsunami Glass Ind., Ltd.) and a polyhydric alcohol having an average particle diameter of 2.4 µm in a mixed solvent of 14 g of solvent acetone having a low boiling point (57 ° C.) and 13 g of methyl ethyl ketone having a low boiling point (80 ° C.) 1 g of a system dispersant SN (manufactured by SAN NOPCO LIMITED) was added and stirred and mixed in a ball mill for 1 hour to obtain a dispersion 13. 25 g of acrylic resin G50 (manufactured by GOO CHEMICAL CO., LTD) and 3 g of DOA (manufactured by DAIHACHI CHEMICAL INDUSTRY CO., LTD) were added to the dispersion 13 in the ball mill, and further mixed for 24 hours to obtain a slurry 13. The viscosity at 20 ° C. of the slurry 13 was 2800 cps.

The slurry 13 was coated on a lumina film using a bar coater and dried at 20 ° C. for 8 hours to obtain green sheet GS13.

The property of the said GS13 was not good in peelability, and some did not peel. In addition, all four cracks of 3cm to 7cm are generated.

(Comparative Example 7)

Alumina borosilicate glass powder (manufactured by Matsunami Glass Ind., Ltd.) with an average particle size of 2.4 µm in a mixed solvent of 15 g of butyl acetate having a high boiling point (123 ° C.) and 11 g of solvent ethyl cellosolve having a high boiling point (135 ° C.) 100 g and 2 g of a nonionic dispersant SN70 (manufactured by SAN NOPCO LIMITED) were added and stirred and mixed for 1 hour to obtain dispersion 14. 10 g of acrylic resin YB-881S (manufactured by Yuken Industries Co., Ltd.) and 3 g of DOA (manufactured by DAIHACHI CHEMICAL INDUSTRY CO., LTD.) Were added to the dispersion 14 in the ball mill, and the mixture was further mixed for 24 hours to obtain a slurry 14. . The viscosity at 20 ° C. of the slurry was 2700 cps.

The slurry 14 was coated on a lumina film using a bar coater and dried at 20 ° C. for 8 hours to obtain green sheet GS14.

As shown in the table, the GS14 had three cracks of more than 10 cm.

Table: Evaluation Results GS1 GS2 GS3 GS4 GS5 GS6 GS7 Bondability ○ ○ ○ ○ ○ ○ ○ Plasticity ○ × ○ ○ × ○ ○ Peelability ○ ○ × ○ ○ × ○ Surface appearance ○ ○ × ○ × ○ ○

GS8 GS9 GS10 GS11 GS12 GS13 GS14 Bondability ○ ○ ○ ○ ○ ○ ○ Plasticity ○ ○ ○ ○ ○ ○ ○ Peelability ○ ○ ○ ○ × × ○ Surface appearance ○ ○ ○ ○ × × ×

While the invention has been described in detail with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention.

This application is based on the JP Patent application (2007-188565) of an application on July 19, 2007, and a Japanese patent application (2008-155158) for a file of June 13, 2008, the content of which is herefor reference As inserted.

Claims (4)

A slurry composition for forming a green sheet, comprising a mixed solvent, a binder, and a powder containing a low boiling point solvent having a boiling point of less than 100 ° C. and a high boiling point solvent having a boiling point of 100 ° C. or more. The method of claim 1, A slurry composition for forming a green sheet, wherein a difference in boiling point between the low boiling point solvent and the high boiling point solvent is 10 ° C. or more. The sheet or film is peeled off after coating and drying the slurry composition for green sheet formation of Claim 1 or 2 on a sheet or a film, The manufacturing method of the green sheet characterized by the above-mentioned. It is obtained by the manufacturing method of Claim 3, and contains a binder and a powder body, The green sheet characterized by the above-mentioned.