JP2007106802A - Binder resin composition and inorganic microparticle-dispersed paste composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a binder resin composition which has an excellent thixotropic property, is easy to wipe off, has a reduced time change in screen printability and allows a low temperature baking and an inorganic microparticle-dispersed paste composition. <P>SOLUTION: The inorganic microparticle-dispersed paste composition comprises a polyalkylene ether having a polystyrene-converted number average molecular weight as determined by gel permeation chromatography of 4,000-400,000, an organic compound having not less than 3 hydroxyl groups, an organic solvent and inorganic microparticles. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a binder resin composition and an inorganic fine particle-dispersed paste composition that are excellent in thixotropy and wiping properties, have little change with time in screen printability, and can be fired at a low temperature.

Plasma display panels (hereinafter also referred to as PDPs) have attracted attention as flat phosphor display panels. The PDP causes plasma discharge between electrodes in a discharge space provided between a front glass substrate and a back glass substrate, and applies ultraviolet rays generated from a gas sealed in the discharge space to a phosphor in the discharge space. Thus, light emission is obtained.

Conventionally, the phosphor in the discharge space is a paste composition obtained by dispersing the phosphor in an organic binder obtained by dissolving ethyl cellulose as a binder resin in an organic solvent such as terpineol, using a screen printing device. After coating on the surface of the glass substrate and drying the organic solvent, ethyl cellulose is thermally decomposed and sintered on the surface of the glass substrate.

When screen printing is performed, the paste composition to be coated preferably has thixotropic properties (hereinafter also referred to as thixotropic properties). The thixotropy is a property in which, for example, when the viscosity is evaluated with a rotational viscometer, the viscosity decreases at high rotation (displacement with a high strain rate), and the viscosity increases at low rotation (displacement with a low strain rate). In the paste composition, the viscosity is sufficiently low when applied, and easy to apply. On the other hand, when it is allowed to stand and dry after coating, the viscosity is sufficiently high that it does not spontaneously cast. Properties are required.

When ethyl cellulose is used as the binder resin, good thixotropy can be obtained, but it is necessary to heat to about 500 ° C. because of poor thermal decomposability. When heated at such a high temperature, there is a problem that the initial luminance of the phosphor deteriorates.

On the other hand, Patent Literature 1 and Patent Literature 2 disclose a combination of an ether material and an acrylic resin as an organic binder. Since such an organic binder decomposes at a low temperature, the problem of deterioration of the initial luminance of the phosphor does not occur.
Here, when the operation of printing the paste composition using the screen printing apparatus is continuously performed for a long time, the paste composition adheres to the back surface of the screen printing plate without falling from the screen printing plate to the glass substrate. The phenomenon occurs. The back side of the screen printing plate is wiped off with a waste cloth or the like each time. However, when a combination of an ether material and an acrylic resin is used as the organic binder, there arises a problem that the wiping property of the screen printing plate is poor. When the wiping property is poor, there is a problem that the glass substrate cannot be peeled off from the screen printing plate and the productivity is extremely deteriorated.
JP 2005-179178 A JP 2002-311583 A

The present invention has been made in view of the above circumstances, and has an object to provide a binder resin composition and an inorganic fine particle-dispersed paste composition that are excellent in thixotropy and wiping properties, have little change with time in screen printability, and can be fired at low temperature. And

The present invention is a binder resin composition comprising a polyalkylene ether having a polystyrene-equivalent number average molecular weight of 4,000 to 400,000 measured by gel permeation chromatography and an organic compound having three or more hydroxyl groups. .
Further, the present invention comprises a polyalkylene ether having a polystyrene-equivalent number average molecular weight of 4,000 to 400,000 measured by gel permeation chromatography, an organic compound having three or more hydroxyl groups, an organic solvent, and inorganic fine particles. An inorganic fine particle dispersed paste composition.
The present invention is described in detail below.

The present inventors considered solving the problem of the thermal decomposition temperature and the wiping property by using a polyalkylene ether resin as the binder resin of the inorganic fine particle dispersed paste composition.
However, there are problems that the dispersibility of the inorganic fine particles with respect to the binder resin is poor and that sufficient thixotropy cannot be obtained. Further, when a low molecular weight polyalkylene ether resin is used, there is a problem that thixotropy cannot be obtained due to dilution with an organic solvent or the like.
As a result of further intensive studies, the present inventors have found that a polyalkylene ether resin having a number average molecular weight within a certain range and a binder resin composition containing an organic compound having a certain number of hydroxyl groups have excellent dispersibility of inorganic fine particles, and thixotropy. It was found that sex was expressed.
Furthermore, the polyalkylene ether resin having a number average molecular weight within a certain range, the organic compound having a certain number of hydroxyl groups or more, and the inorganic fine particle dispersed paste composition containing inorganic fine particles are also excellent in thixotropy, wiping properties, and stringiness. The present inventors have found that it is excellent, has little change with time in screen printability, and can be fired at a low temperature, thereby completing the present invention.

The inorganic fine particle-dispersed paste composition of the present invention contains a polyalkylene ether having a polystyrene-equivalent number average molecular weight of 4,000 to 400,000 as measured by gel permeation chromatography (hereinafter also referred to as GPC).
In the present invention, the polyalkylene ether has a role as a binder.

The polyalkylene ether has a polystyrene-reduced number average molecular weight measured by GPC of 4000 and an upper limit of 400,000. If the number average molecular weight in terms of polystyrene is less than 4000, sufficient thixotropy may not be obtained, and if it exceeds 400,000, the boiling point becomes too high, low-temperature firing becomes impossible, and stringing becomes worse. Sometimes. The preferred lower limit is 6000, the preferred upper limit is 350,000, the more preferred lower limit is 8000, and the more preferred upper limit is 300,000.
Moreover, as a column for measuring the number average molecular weight in terms of polystyrene by GPC, SHOKO column LF-804 and the like can be mentioned.

The polyalkylene ether is not particularly limited, and examples thereof include polypropylene glycol ether, polytetramethylene glycol ether, and polyethylene glycol ether. Among them, polyethylene glycol ether may not be dissolved in an organic solvent, and polytetramethylene glycol ether is preferably used because of its poor thermal decomposability.
However, since polyalkylene ethers can easily produce a plurality of types of random or block copolymers, problems such as crystallinity of polyethylene glycol ether can be easily solved. Therefore, a copolymer of polyethylene glycol ether and polypropylene glycol ether, a copolymer of polyethylene glycol ether and polytetramethylene glycol ether, and a copolymer of polypropylene glycol ether and polytetramethylene glycol ether are preferably used. it can.

The inorganic fine particle dispersed paste composition of the present invention contains an organic compound having three or more hydroxyl groups.
Since the polyalkylene ether is diluted with a solvent or the like to lower the viscosity, the inorganic fine particle-dispersed paste composition has poor screen printability. However, in the inorganic fine particle-dispersed paste composition of the present invention, the addition of an organic compound having three or more hydroxyl groups causes an interaction due to hydrogen bonding with the polyalkylene ether, and therefore the inorganic composition of the present invention. The viscosity can be increased without impairing the thermal decomposability of the fine particle dispersed paste composition, and thixotropy can be improved by adding inorganic fine particles described later.

The organic compound having three or more hydroxyl groups is not particularly limited. For example, glycerin, diglycerin, trimethylolpropane, pentaerythritol, meso-erythritol, L-threitol, D-threitol, DL-threitol, 2-hydroxymethyl. -1,3-propanediol, 1,1,1-trihydroxymethylethane, 1,2,4-butanetriol, 1,2,6-hexanetriol and the like. Especially, a liquid thing is used suitably at normal temperature.

The organic compound having 3 or more hydroxyl groups is preferably a polyfunctional polyether having a hydroxyl value of 200 mgKOH / g or more because the compatibility with the polyalkylene ether is enhanced. In addition, since the compatibility is further enhanced, the polyfunctional polyether preferably has the same basic repeating structure as the polyalkylene ether.
By using such an organic compound having three or more hydroxyl groups, the wiping property during screen printing is improved.

The content of the organic compound having three or more hydroxyl groups is not particularly limited, but a preferable lower limit is 0.1% by weight with respect to the entire inorganic fine particle dispersed paste composition of the present invention. If it is less than 0.1% by weight, sufficient thixotropy may not be obtained.
When the organic compound having 3 or more hydroxyl groups is a polyfunctional polyether having a hydroxyl value of 200 mgKOH / g or more, the compatibility with the polyalkylene ether is unlikely to deteriorate, so the upper limit of the content is There is no particular limitation. Furthermore, the low-temperature decomposability of the inorganic fine particle-dispersed paste composition is improved by using the polyfunctional polyether.
On the other hand, when the organic compound having 3 or more hydroxyl groups is other than the polyfunctional polyether having a hydroxyl value of 200 mgKOH / g or more, the preferred upper limit is 50% by weight. If it exceeds 50% by weight, the compatibility with the polyalkylene ether may be deteriorated, and the storage stability of the inorganic fine particle dispersed paste may be deteriorated.

Here, a binder resin composition containing a polyalkylene ether having a polystyrene-equivalent number average molecular weight of 4,000 to 400,000 as measured by gel permeation chromatography and an organic compound having three or more hydroxyl groups is also included in the present invention. One.

The inorganic fine particle dispersed paste composition of the present invention contains an organic solvent.
The organic solvent is used for the purpose of improving the wiping property and stringiness of the inorganic fine particle dispersed paste composition of the present invention.
The organic solvent is not particularly limited. For example, terpineol, ethylene glycol ethyl ether, ethylene glycol monobutyl ether, ethylene glycol monoethyl ether acetate, butyl carbitol, butyl carbitol acetate, isophorone, butyl lactate, dioctyl phthalate, dioctyl adipate Benzyl alcohol, phenylpropylene glycol, cresol, 2-phenoxyethanol, 1,2-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 2-ethyl-1,3- Examples include hexanetriol and 1,2,6-hexanetriol. These may be used alone or in combination of two or more.
Here, the wipeability of the inorganic fine particle dispersed paste composition depends on the resin fraction in the composition, and the smaller the resin content, the better the wipeability. From these, among these examples, terpineol, 2-phenoxyethanol, 1,2-propanediol, 1,3-butanediol, 1,4-butanediol having a high viscosity and a boiling point of 200 to 300 ° C., 1, 5-pentanediol, 2-ethyl-1,3-hexanetriol, 1,2,6-hexanetriol, etc. are preferable because they increase the viscosity even if the amount of the polyalkylene ether is reduced and evaporate at 300 ° C. or lower. Used for.

The addition amount of the organic solvent is not particularly limited, but the preferred lower limit is 5 parts by weight and the preferred upper limit is 30 parts by weight with respect to 100 parts by weight of the inorganic fine particle dispersed paste composition of the present invention. If it is less than 5 parts by weight, the wiping property of the inorganic fine particle dispersed paste composition of the present invention may not be sufficiently improved. If it exceeds 30 parts by weight, the thixotropy of the inorganic fine particle dispersed paste composition of the present invention may be insufficient. May decrease and screen printability may deteriorate.

The inorganic fine particle-dispersed paste composition of the present invention contains inorganic fine particles.
The inorganic fine particles are not particularly limited. For example, copper, silver, nickel, palladium, alumina, zirconia, titanium oxide, barium titanate, alumina nitride, silicon nitride, boron nitride, silicate glass, lead glass, CaO. Al ₂ O ₃ · SiO ₂ inorganic glass, MgO · Al ₂ O ₃ · SiO ₂ inorganic glass, LiO ₂ · Al ₂ O ₃ · SiO ₂ inorganic glass low melting point glass, BaMgAl ₁₀ O ₁₇ : Eu, Zn ₂ Phosphor such as SiO ₄ : Mn, (Y, Gd) BO ₃ : Eu, various carbon blacks, metal complexes, and the like. Inorganic fine particles such as phosphors that are known to undergo thermal degradation can be combined with a binder that can be decomposed at low temperature to obtain a sintered body by a process that suppresses thermal degradation. Especially, by using a fluorescent substance, it can be suitably used for forming a fluorescent screen of various display devices such as PDP, FED (Field Emission Display), and SED (Surface Production Electron Emission Display).

The addition amount of the inorganic fine particles is not particularly limited, but a preferable upper limit is 50 parts by weight with respect to 100 parts by weight of the inorganic fine particle-dispersed paste composition of the present invention. If it exceeds 50 parts by weight, it may be difficult to disperse uniformly.

The inorganic fine particle-dispersed paste composition of the present invention uses a B-type viscometer and has a viscosity η of ₅ rpm when measured with a probe rotational speed set to 5 rpm, and a viscosity measured with a probe rotational speed set to 30 rpm. the ratio eta _{5 rpm} / eta _{30 rpm} with eta _{30 rpm} it is preferably 1.5 or more. If it is less than 1.5, the thixotropy of the inorganic fine particle-dispersed paste composition of the present invention may be lowered, and screen printability may be lowered.
In addition, since the inorganic fine particle-dispersed paste composition of the present invention must disperse the inorganic fine particles having a high specific gravity, the inorganic fine particles having a high specific gravity will settle unless the viscosity is high to some extent. Therefore, it is preferable to use a B-type viscometer at 23 ° C. and have a viscosity of 20 Pa · s or more at a rotation speed of 5 rpm.

The inorganic fine particle-dispersed paste composition of the present invention has a polyalkylene ether having a polystyrene-equivalent number average molecular weight of 4000 to 400,000 measured by GPC and 3 or more hydroxyl groups when heated at 350 ° C. for 10 minutes in the air. The decomposition rate of the organic compound is 99.5% or more. Thereby, the inorganic fine particle-dispersed paste composition of the present invention can be fired at a low temperature without firing at a high temperature which causes deterioration of the inorganic fine particles, particularly the phosphor.

The method for producing the inorganic fine particle-dispersed paste composition of the present invention is not particularly limited, and kneading may be performed with a conventionally known stirring method, specifically, for example, a three-roll roll.

Since the inorganic fine particle dispersed paste composition of the present invention is composed of a solvent that evaporates at less than 300 ° C. and a polyalkylene ether resin that thermally decomposes at less than 300 ° C., low-temperature firing is possible.
Here, low temperature firing means that the firing temperature at which 99.5% of the initial weight of the binder is lost is low temperature, and in this specification, the firing temperature is under a normal air atmosphere without nitrogen substitution or the like. The case of 250 to 400 ° C. is defined as low temperature firing.

According to the present invention, a polyalkylene ether resin having a number average molecular weight in a certain range and an inorganic fine particle dispersed paste composition containing an organic compound having a certain number of hydroxyl groups are excellent in thixotropy, wiping properties, and stringiness, and screen printing. It has been found that there is little change in properties with time and that low-temperature firing is possible.
According to the present invention, it is possible to provide a binder resin composition and an inorganic fine particle-dispersed paste composition that are excellent in thixotropy and wiping properties, have little change in screen printability with time, and can be fired at a low temperature.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

Example 1
35 parts by weight of polypropylene glycol ether (polystyrene equivalent number average molecular weight 15000), 20 parts by weight of terpineol as an organic solvent, 5 parts by weight of glycerin as an organic compound having 3 or more hydroxyl groups, until uniform with a high-speed stirrer It knead | mixed and produced the binder resin composition.
Next, 40 parts by weight of phosphor Zn ₂ SiO ₄ : Mn (manufactured by Nichia Chemical Co., Ltd., green phosphor) is added as inorganic fine particles, kneaded with a high-speed stirrer, and then smoothly with a three-roll mill. The inorganic fine particle dispersed paste composition was prepared by kneading until it became.
In addition, the polystyrene conversion number average molecular weight was measured by GPC, and a column LF-804 manufactured by SHOKO was used as the column. The same applies to the following examples and comparative examples.

(Example 2)
35 parts by weight of polypropylene glycol ether (polystyrene equivalent number average molecular weight 8000), 20 parts by weight of terpineol as an organic solvent, 5 parts by weight of glycerin as an organic compound having 3 or more hydroxyl groups, until uniform with a high-speed stirrer It knead | mixed and produced the binder resin composition.
Next, 40 parts by weight of phosphor Zn ₂ SiO ₄ : Mn (manufactured by Nichia Chemical Co., Ltd., green phosphor) is added as inorganic fine particles, kneaded with a high-speed stirrer, and then smoothly with a three-roll mill. The inorganic fine particle dispersed paste composition was prepared by kneading until it became.

(Example 3)
25 parts by weight of polypropylene glycol ether (polystyrene equivalent number average molecular weight 15000), 10 parts by weight of terpineol as an organic solvent, 25 parts by weight of polyfunctional polypropylene glycol ether (hydroxyl value 755 mgKOH / g) as an organic compound having 3 or more hydroxyl groups Then, the mixture was kneaded with a high-speed agitator until uniform, and a binder resin composition was prepared.
Next, 40 parts by weight of phosphor Zn ₂ SiO ₄ : Mn (manufactured by Nichia Chemical Co., Ltd., green phosphor) is added as inorganic fine particles, kneaded with a high-speed stirrer, and then smoothly with a three-roll mill. The inorganic fine particle dispersed paste composition was prepared by kneading until it became.

Example 4
25 parts by weight of polypropylene glycol ether (polystyrene equivalent number average molecular weight 15000), 10 parts by weight of terpineol as an organic solvent, 25 parts by weight of polyfunctional polypropylene glycol ether (hydroxyl value 288 mgKOH / g) as an organic compound having 3 or more hydroxyl groups Then, the mixture was kneaded with a high-speed agitator until uniform, and a binder resin composition was prepared.
Next, 40 parts by weight of phosphor Zn ₂ SiO ₄ : Mn (manufactured by Nichia Chemical Co., Ltd., green phosphor) is added as inorganic fine particles, kneaded with a high-speed stirrer, and then smoothly with a three-roll mill. The inorganic fine particle dispersed paste composition was prepared by kneading until it became.

(Example 5)
Blend 35 parts by weight of polypropylene glycol ether (polystyrene equivalent number average molecular weight 15000), 20 parts by weight of terpineol as an organic solvent, and 5 parts by weight of glycerin as an organic compound having 3 or more hydroxyl groups, and knead until uniform with a high-speed stirrer. Then, a binder resin composition was produced.
Next, 40 parts by weight of phosphor BaMgAl ₁₀ O ₁₇ : Eu (manufactured by Nichia Chemical Co., Ltd., blue phosphor) is added as inorganic fine particles, kneaded with a high-speed stirrer, and then smoothly with a three-roll mill. The inorganic fine particle dispersed paste composition was prepared by kneading until it became.

(Example 6)
35 parts by weight of polypropylene glycol ether (polystyrene equivalent number average molecular weight 15000), 20 parts by weight of terpineol as an organic solvent, 5 parts by weight of glycerin as an organic compound having 3 or more hydroxyl groups, until uniform with a high-speed stirrer It knead | mixed and produced the binder resin composition.
Next, 40 parts by weight of phosphor (Y, Gd) BO ₃ : Eu (manufactured by Nichia Chemical Co., Ltd., red phosphor) is added as inorganic fine particles, kneaded with a high-speed stirrer, and then into a three roll mill By kneading until smooth, an inorganic fine particle dispersed paste composition was prepared.

(Comparative Example 1)
35 parts by weight of polypropylene glycol ether (polystyrene equivalent number average molecular weight 2000), 20 parts by weight of terpineol as an organic solvent, 5 parts by weight of glycerin as an organic compound having 3 or more hydroxyl groups, until uniform with a high-speed stirrer It knead | mixed and produced the binder resin composition.
Next, 40 parts by weight of phosphor Zn ₂ SiO ₄ : Mn (manufactured by Nichia Chemical Co., Ltd., green phosphor) is added as inorganic fine particles, kneaded with a high-speed stirrer, and then smoothly with a three-roll mill. The inorganic fine particle dispersed paste composition was prepared by kneading until it became.

(Comparative Example 2)
25 parts by weight of polypropylene glycol ether (polystyrene equivalent number average molecular weight 2000), 10 parts by weight of terpineol as an organic solvent, 25 parts by weight of polyfunctional polypropylene glycol ether (hydroxyl value 755 mgKOH / g) as an organic compound having 3 or more hydroxyl groups Then, the mixture was kneaded with a high-speed agitator until uniform, and a binder resin composition was prepared.
Next, 40 parts by weight of phosphor Zn ₂ SiO ₄ : Mn (manufactured by Nichia Chemical Co., Ltd., green phosphor) is added as inorganic fine particles, kneaded with a high-speed stirrer, and then smoothly with three rolls. The inorganic fine particle dispersed paste composition was prepared by kneading until it became.

(Comparative Example 3)
By polymerizing methyl methacrylate in terpineol, an acrylic resin having a polystyrene-equivalent number average molecular weight of 100,000 was obtained. A binder resin composition containing 35 parts by weight of terpineol-containing acrylic resin, 20 parts by weight of terpineol as an organic solvent, and 5 parts by weight of glycerin as an organic compound having three or more hydroxyl groups, and kneaded until uniform with a high-speed agitator. Was made.
Next, 40 parts by weight of phosphor Zn ₂ SiO ₄ : Mn (manufactured by Nichia Chemical Co., Ltd., green phosphor) is added as inorganic fine particles, kneaded with a high-speed stirrer, and then smoothly with three rolls. The inorganic fine particle dispersed paste composition was prepared by kneading until it became.

(Comparative Example 4)
40 parts by weight of polypropylene glycol ether (polystyrene-converted number average molecular weight 15000) and 20 parts by weight of terpineol as an organic solvent were blended and kneaded with a high-speed stirring device until uniform to prepare a binder resin composition.
Next, 40 parts by weight of phosphor Zn ₂ SiO ₄ : Mn (manufactured by Nichia Chemical Co., Ltd., green phosphor) is added as inorganic fine particles, kneaded with a high-speed stirrer, and then smoothly with a three-roll mill. The inorganic fine particle dispersed paste composition was prepared by kneading until it became.

<Evaluation>
The following evaluation was performed about the inorganic fine particle dispersion | distribution paste composition obtained in Examples 1-6 and Comparative Examples 1-4. The results are shown in Table 1.

(1) Screen printability (viscosity ratio method (thixotropic evaluation method))
The inorganic fine particle-dispersed paste composition was measured for viscosities η _{5 rpm} and η ₃₀ rpm at a rotation speed of 5 rpm and 30 rpm at 23 ° C. using a B-type viscometer (manufactured by BROOK FILED, DVII + Pro). The viscosity ratio η _{5 rpm} / η _{30 rpm} was determined from the obtained viscosity.
_Those having a viscosity ratio η _{5 rpm} / η _{30 rpm} of 1.5 or more were judged to be excellent in screen printability.

(2) TG / DTA evaluation The binder resin composition before adding the phosphor of the inorganic fine particle dispersed paste composition is heated at a temperature of 10 ° C./min in an air atmosphere using a thermal decomposition apparatus (simultaneous SDT 2960 manufactured by TA Instruments). Was heated to 600 ° C., and the temperature at which the thermal decomposition was completed was measured.
Those having a decomposition end temperature of 400 ° C. or lower were judged to be good.

(3) Wiping property evaluation 10 g of inorganic fine particle dispersed paste composition is coated on a stainless steel plate to a thickness of 5 mil with an applicator, wiped with a Kim towel containing ethanol, and the ease of wiping is determined according to the following criteria. evaluated.
○: It was able to wipe off cleanly.
X: It could not be wiped off cleanly.

(4) Evaluation of thermal decomposition rate An aluminum cup manufactured by AS ONE was marked so that the sample number could be understood, and the weight was evaluated in advance using an electronic balance. About 10 g of the binder resin composition before adding the phosphor of the inorganic fine particle dispersed paste composition was weighed into an aluminum cup. A decirculated forced circulation oven was set at 350 ° C. in advance, and after confirming that the internal temperature was stable, an aluminum cup weighing the binder resin composition was put into the oven, taken out after 10 minutes, and cooled at room temperature. Thereafter, the weight of the aluminum cup was weighed with an electronic balance, and the decomposition rate of the binder resin composition was evaluated.

In Examples 1 to 6, good results were obtained for all the evaluation items.
In Comparative Examples 1 and 2, since no high molecular weight polyalkylene ether was added, thixotropy was not obtained, and the viscosity decreased overall. Therefore, sedimentation of the phosphor was observed by observation over time.
In Comparative Example 3, an acrylic resin was used, but the thermal decomposition temperature was high, ethanol wiping property showed strong adhesiveness, and wiping property was poor.
In Comparative Example 4, thixotropy was not obtained because an organic compound having 3 or more hydroxyl groups was not added, and the viscosity decreased overall. Therefore, sedimentation of the phosphor was observed by observation over time.

According to the present invention, it is possible to provide a binder resin composition and an inorganic fine particle-dispersed paste composition that are excellent in thixotropy and wiping properties, have little change in screen printability with time, and can be fired at a low temperature.

Claims (9)

A binder resin composition comprising a polyalkylene ether having a polystyrene-equivalent number average molecular weight of 4,000 to 400,000 measured by gel permeation chromatography and an organic compound having three or more hydroxyl groups. An inorganic fine particle-dispersed paste comprising a polyalkylene ether having a polystyrene equivalent number average molecular weight of 4,000 to 400,000 measured by gel permeation chromatography, an organic compound having three or more hydroxyl groups, an organic solvent, and inorganic fine particles Composition. The inorganic fine particle-dispersed paste composition according to claim 2, wherein the polyalkylene ether is polypropylene glycol ether. 4. The inorganic fine particle dispersed paste composition according to claim 2, wherein the organic compound having 3 or more hydroxyl groups is a polyfunctional polyether having a hydroxyl value of 200 mgKOH / g or more. 4. The inorganic fine particle dispersed paste composition according to claim 2, wherein the content of the organic compound having 3 or more hydroxyl groups is 0.1 to 50% by weight. The inorganic fine particle-dispersed paste composition according to claim 2, 3, 4, or 5, wherein the organic solvent has a boiling point of 200 to 300 ° C. The inorganic fine particle-dispersed paste composition according to claim 2, wherein the inorganic fine particle is a phosphor. Using a B-type viscometer at 23 ° C., and a viscosity eta _{5 rpm} when measured by setting the probe rotation speed 5 rpm, the ratio eta _{5 rpm} with viscosity eta _{30 rpm} when measured by setting the probe rpm to 30 rpm / The inorganic fine particle-dispersed paste composition according to claim 2, _wherein η _{30 rpm} is 1.5 or more. The decomposition rate of the polyalkylene ether and the organic compound having 3 or more hydroxyl groups when heated at 350 ° C. in the atmosphere for 10 minutes is 99.5% or more, The inorganic fine particle dispersion paste composition according to 5, 6, 7 or 8.