JPS5945373A - Binder composition for paste - Google Patents

Abstract

PURPOSE:To prepare the titled composition having high leveling property and flexibility, and resistant to cracking in drying, by adding a dispersing agent and a solvent to a binder containing ethyl cellulose, polyvinyl butyral and n-dibutyl phthalate at specific ratios. CONSTITUTION:The objective binder composition for paste can be prepared by mixing (A) binder composed of 60-75wt% of ethyl cellulose, 5-17.5wt% of polyvinyl butyral and 10-30wt% of n-dibutyl phthalate with (B) a polyoxyethylene alkylamine surface active agent as a dispersing agent, and (C) a terpineol as a solvent. EFFECT:It improves the handleability of a ceramic paste, and gives a multi-layer ceramic substrate and multi-layer ceramic capacitor in high yield by multi-layer printing process.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical field of the invention The present invention relates to a binder yarn composition used in manufacturing a paste for forming a multilayer structure such as a multilayer ceramic substrate or a multilayer ceramic capacitor. be.

(2) Background of the technology Conventionally, a ceramic multilayer substrate is produced by a printing multilayer method in which a current-visiting body layer and a conductor layer are formed by screen printing, and the layers are formed by repeated printing and drying, and then fired. There is a way to obtain multilayer ceramic capacitors. The dielectric and conductor pastes used in this method are required to have the following properties.

■ It should not crack when drying, and should have appropriate flexibility and be easy to handle when removed from the stand used for printing (for example, aluminum foil attached to a frame).

■ No pinholes should occur during drying.

■ It dries quickly and its viscosity does not change easily during printing.

■ Good leveling properties.

Generally, ethyl cellulose is used as a binder for thick film pastes.
Although nitrocellulose and the like are used, the above properties cannot be obtained with these binders alone. Therefore, there is a need for a binder having the above-mentioned properties.

(3) Purpose of the Invention Based on the cost requirements mentioned above, Nehatsuri J is a material that, when added to a paste, has good printing properties, does not cause cracks or pinholes when drying, and has appropriate flexibility. The purpose is to provide such a binder system composition.

(4) Structure and object of the invention according to the present invention: f L iJ: Adding a polyoxyethylene albylabine world 11Ii activator as a dispersant to a binder consisting of ethyl cellulose, polyvinyl butyral, and n-dibutyl phthalate; In the binder system for yeast with terpineol added as a solvent, the binder consists of Ewol cellulose 60 to 75% by weight, polyvinyl butyral 5 to 17.5% by weight, and n-butyl phthalate 10 to 30% by weight. % wt.

(5) Examples of the invention Examples of the present invention will be described in detail below.

Example 1 BaTi05 (average particle size 13 μm) as dielectric powder
The first electrode powder was PD (average particle size 0.9 μm).
A dielectric paste was prepared using the binder yarns A-E shown in the table/ζ. However, the S number of the binder is the amount added per raw material powder ioog, and (a) is the ratio of each component to the total amount of the binder. Further, the amount of binder added to the Pd paste was 0.9 times that of the dielectric paste. Further, the amount of terpineol added varies depending on the type of binder.

This addition increases the viscosity of the paste to 50,000 cps (at 27
℃).

1. Margin: Since ethyl cellulose and polyvinyl butyral are polymers, their molecular weights change by 6%. Here, the viscosity of the ethanol/toluene = 1/HDIO% solution is 30 to 60.
cps was used.

Dielectric yeast was printed on aluminum foil soil using the above paste, and 10 layers of conductor Pd paste and 25 μm thick dielectric paste were printed on the soil alternately, and then 6 layers were heated at 120℃.
Drying was performed for minutes. The results were as shown in Table 2.

In Table 2, sample A had pinholes in the dielectric layer, and sample E had poor handling and the conductor moved and misaligned, but the composition was within the %#'fm range of the present invention. Samples B, C, and D using the binder system did not cause any problems.

In addition, polyvinyl butyral Jugetsuri and phthalic acid-n
- Dibutyl improves the properties of nib A7 cellulose, which is the main binder, and is added to prevent cracking and improve Jta resistance. When the amount is less, cracks are more likely to occur. If the amount of n-butyl phthalate is less than 10%, flexibility will be lost and handling properties will be poor, and if it is more than 35%, the drying rate will be slow. In addition, if the amount of binder added is less than 17g per 100I of powder, cracks are not likely to occur, and if it is more than 35g, the drying speed is slow, and the firing shrinkage rate is high. Pass.

If the drying speed is slow, there is a greater possibility that conductor misalignment will occur when multilayering is performed under the same drying conditions.

Example 2 The binder system of sample C in Table ii was changed to BaTiO3100,
! A dielectric paste containing 0.6, 0.8, 1.2, and 1.4 times the amount of Pd10 (conductor paste) Pd10 was prepared.
Multilayering was performed in the same manner as in the previous example using a binder system in which sample C was added in a ratio of 0.9 times to 1'. As a result, in the case of 0.6 times, cracks occur during multilayering, and 1.4
In the case of double the number, displacement of the conductor occurred, but no problem occurred in the other cases.

As a result of baking at 1350° C. after punching out those in Examples 1 and 2 that did not cause problems in multilayering, the desired multilayer structure was obtained. Firing shrinkage rate t at this time
It was about 20-25%.

Example 3 In Examples 1 and 2, terpinemer was used as a solvent, but problems in multilayering did not occur even if a solvent such as carpitol or carpitol acetate such as butyl carpitol or butyl carpitol was used instead of terpineol. There wasn't.

(6) Effect of ``Starting'' As explained in detail above, the binder composition for the paste of the present invention improves the handling properties of the ceramic paste by JL, and there is no occurrence of pinholes, cracks, etc. This method has great effects in that multilayer ceramic substrates and multilayer ceramic capacitors can be manufactured with high yield, and reliability is also improved because pinholes in the dielectric can be completely eliminated.

patent applicant Fujitsu Limited patent application agent Patent Attorney Official Akira Ki Patent attorney Kazuyuki Nishidate Patent attorney 1) Yukio Patent attorney Akira Yamaguchi

Claims (1)

[Claims] 1. Ethyl cellulose, polyvinyl butyral, 7
In a paste binder system in which a polyoxyethylene alkylamine surfactant is added as a dispersant to a binder made of n-diptylate tarate, and terpineol is added as a solvent, the binder is ethyl cellulose 60-75
]j[H%, polyvinyl butyral 5-17.5% by weight
, Phthal [-n-.Sibutyl 10 to 30% by weight.