JP2005195941A - Pigment-dispersed liquid for color filter, pigment-dispersed resist composition for color filter, and color filter using them - Google Patents

Pigment-dispersed liquid for color filter, pigment-dispersed resist composition for color filter, and color filter using them Download PDF

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JP2005195941A
JP2005195941A JP2004002918A JP2004002918A JP2005195941A JP 2005195941 A JP2005195941 A JP 2005195941A JP 2004002918 A JP2004002918 A JP 2004002918A JP 2004002918 A JP2004002918 A JP 2004002918A JP 2005195941 A JP2005195941 A JP 2005195941A
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pigment
pigment dispersion
particle size
color filter
resist composition
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Satoru Fuyama
解 麩山
Shingo Araki
慎悟 荒木
Masaaki Kishimoto
昌明 岸本
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DIC Corp
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Dainippon Ink and Chemicals Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a pigment-dispersed liquid and a pigment-dispersed resist composition for color filter, with which a color filter for color liquid crystal display having superior transparency, heat resistance and light resistance can be manufactured and which has superior preservation stability and developing property. <P>SOLUTION: The pigment-dispersed liquid is prepared by dispersing pigment (A), whose primary particle size is 10 - 80 nm into an organic solvent (C) in the presence of a dispersant (B). Therein, the average particle size of the pigment in the pigment-dispersed liquid is 80 nm or smaller and the particle size distribution of the pigment satisfies the expression (1): 5 (nm) ≤ (d<SB>84</SB>-d<SB>16</SB>) ≤ 50 (nm) (1). In the relation (1), d<SB>84</SB>represents the particle size (nm) of the point on a cumulative curve of the particle size distribution, whose cumulative amount becomes 84 wt.%, and d<SB>16</SB>represents the particle size (nm) of the point on the cumulative curve of the particle size whose cumulative amount becomes 16 wt.%. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、カラー液晶ディスプレイ用カラーフィルターに用いられる顔料分散液及び顔料分散レジスト組成物に関する。   The present invention relates to a pigment dispersion and a pigment dispersion resist composition used for a color filter for a color liquid crystal display.

カラーフィルターの製造方法としては、例えば、分散剤を用いて、有機溶剤中に顔料を分散した顔料分散液に、アルカリ可溶性樹脂、光硬化性モノマー、光重合開始剤等を添加した顔料分散レジスト組成物を調製し、この顔料分散レジスト組成物を透明ガラス板上に塗布、乾燥させた後、マスクを用いて露光し、次いで、アルカリ現像によって未露光部を除去し、着色パターンを形成させる方法が知られている。また、着色パターンは、赤、緑、青の光の3原色を選択的に透過する画素として形成される。   As a method for producing a color filter, for example, a pigment-dispersed resist composition in which an alkali-soluble resin, a photocurable monomer, a photopolymerization initiator, and the like are added to a pigment dispersion obtained by dispersing a pigment in an organic solvent using a dispersant. The pigment-dispersed resist composition was applied onto a transparent glass plate and dried, then exposed using a mask, and then the unexposed area was removed by alkali development to form a colored pattern. Are known. The coloring pattern is formed as a pixel that selectively transmits three primary colors of red, green, and blue.

近年、カラー液晶ディスプレイパネルの大型化、用途の多様化に伴い、色再現性、透明性、耐熱性、耐光性、耐薬品性等の物性が、より高いレベルで要求されるようになってきた。この要求に対応するため、カラーフィルターの画素を形成する色材としては、耐熱性、耐光性、耐薬品性等に優れる顔料が、主に用いられるようになってきている。   In recent years, as color liquid crystal display panels have become larger and diversified in use, physical properties such as color reproducibility, transparency, heat resistance, light resistance, and chemical resistance have been required at a higher level. . In order to meet this demand, pigments that are excellent in heat resistance, light resistance, chemical resistance, and the like are mainly used as color materials for forming pixels of color filters.

顔料を用いたカラーフィルター用顔料分散液及び顔料分散レジスト組成物には、様々な物性が要求される。例えば、顔料分散液には、バインダー樹脂等との相溶性、流動性、保存安定性等の物性が要求される。また、顔料分散レジスト組成物には、保存安定性、塗布性、現像性等の物性が要求される。さらに、顔料分散レジスト組成物を用いて製造したカラーフィルターには、透明性、耐熱性、耐光性、耐薬品性等の物性が要求され、これらの物性の中でも、特に高い透明性が要求されている。   Various physical properties are required for a pigment dispersion for a color filter and a pigment dispersion resist composition using a pigment. For example, the pigment dispersion is required to have physical properties such as compatibility with a binder resin and the like, fluidity, and storage stability. In addition, the pigment-dispersed resist composition is required to have physical properties such as storage stability, coatability, and developability. Furthermore, color filters manufactured using a pigment-dispersed resist composition are required to have physical properties such as transparency, heat resistance, light resistance, and chemical resistance. Among these physical properties, particularly high transparency is required. Yes.

顔料を用いたカラーフィルターで高い透明性を得るために、粒径1μm以上の粒子が全粒子の10質量%以下であり、かつ、粒径0.01〜0.3μmの粒子が全粒子の60質量%以上であるような粒径分布を有する顔料を用いたカラーフィルター形成用樹脂組成物が提案されている。しかしながら、この樹脂組成物を用いたカラーフィルターは、現在、要求されている高い透明性、耐熱性及び耐光性を満たすものではなかった(例えば、特許文献1参照。)。   In order to obtain high transparency with a color filter using a pigment, particles having a particle size of 1 μm or more are 10% by mass or less of all particles, and particles having a particle size of 0.01 to 0.3 μm are 60% of all particles. There has been proposed a resin composition for forming a color filter using a pigment having a particle size distribution that is at least mass%. However, a color filter using this resin composition does not satisfy currently required high transparency, heat resistance and light resistance (see, for example, Patent Document 1).

また、カラーフィルターの3原色である青色、緑色及び赤色の着色ペーストにおいて、各色の顔料の平均粒径を規定したカラーフィルター用着色ペーストが提案されている。この着色ペーストは、彩度は向上したが、透明性については不充分であった(例えば、特許文献2参照。)。   Further, among color pastes of blue, green, and red, which are the three primary colors of color filters, color filter color pastes have been proposed in which the average particle diameter of the pigments of each color is defined. This colored paste has improved chroma, but has insufficient transparency (for example, see Patent Document 2).

さらに、1次粒子径が10〜80nmの顔料を用いたカラーフィルター用顔料分散組成物が提案されている。この顔料分散組成物も、現在、要求されている高い透明性、耐熱性及び耐光性を充分に満たすものではなかった(例えば、特許文献3参照。)。   Furthermore, a pigment dispersion composition for a color filter using a pigment having a primary particle size of 10 to 80 nm has been proposed. This pigment dispersion composition also does not sufficiently satisfy currently required high transparency, heat resistance and light resistance (see, for example, Patent Document 3).

特開平4−348142号公報JP-A-4-348142 特開平6−174909号公報JP-A-6-174909 特開2003−64293号公報JP 2003-64293 A

本発明が解決しようとする課題は、透明性、耐熱性及び耐光性に優れたカラー液晶ディスプレイ用カラーフィルターを製造でき、かつ保存安定性及び現像性に優れたカラーフィルター用顔料分散液及び顔料分散レジスト組成物を提供することにある。   The problem to be solved by the present invention is to produce a color filter for a color liquid crystal display excellent in transparency, heat resistance and light resistance, and in a color filter pigment dispersion and pigment dispersion excellent in storage stability and developability. It is to provide a resist composition.

本発明者らは、上記課題を解決すべく鋭意検討を重ねた結果、微粒子化した顔料を、分散剤存在下で有機溶剤中に分散させて顔料分散液を得る際に、顔料分散液中の顔料の平均粒子径及び粒度分布を制御することにより、透明性、耐熱性及び耐光性に優れたカラーフィルターが製造でき、かつ保存安定性及び現像性に優れたカラーフィルター用顔料分散液及び顔料分散レジスト組成物が得られることを見出し、本発明を完成するに至った。   As a result of intensive studies to solve the above-mentioned problems, the present inventors have dispersed a finely divided pigment in an organic solvent in the presence of a dispersant to obtain a pigment dispersion. By controlling the average particle size and particle size distribution of the pigment, a color filter excellent in transparency, heat resistance and light resistance can be produced, and the pigment dispersion and pigment dispersion for color filter excellent in storage stability and developability The inventors have found that a resist composition can be obtained and have completed the present invention.

すなわち、本発明は、1次粒子径が10〜80nmである顔料(A)を、分散剤(B)の存在下で、有機溶剤(C)中に分散させた顔料分散液であって、前記顔料分散液中の顔料の平均粒子径が80nm以下で、かつ顔料の粒度分布が下記の式1を満足することを特徴とするカラーフィルター用顔料分散液を提供するものである。
5(nm)≦(d84−d16)≦50(nm) ……(式1)
(式中、d84は、粒度分布の累積曲線が84質量%となる点の粒子径(nm)を表し、d16は、粒度分布の累積曲線が16質量%となる点の粒子径(nm)を表す。)
That is, the present invention is a pigment dispersion in which a pigment (A) having a primary particle size of 10 to 80 nm is dispersed in an organic solvent (C) in the presence of a dispersant (B), An object is to provide a pigment dispersion for a color filter, wherein the average particle diameter of the pigment in the pigment dispersion is 80 nm or less, and the particle size distribution of the pigment satisfies the following formula 1.
5 (nm) ≦ (d 84 −d 16 ) ≦ 50 (nm) (Formula 1)
(Where d 84 represents the particle size (nm) at which the cumulative curve of particle size distribution is 84% by mass, and d 16 is the particle size (nm at which the cumulative curve of particle size distribution is 16% by mass). )

本発明のカラーフィルター用顔料分散液及び顔料分散レジスト組成物は、保存安定性及び現像性に優れる。また、本発明のカラーフィルター用顔料分散液及び顔料分散レジスト組成物を用いたカラーフィルターは、透明性、耐熱性及び耐光性に優れるため、カラー液晶ディスプレイ、カラースキャナー等に用いられるカラーフィルター等に好適に用いることができる。   The pigment dispersion for color filters and the pigment dispersion resist composition of the present invention are excellent in storage stability and developability. In addition, since the color filter using the pigment dispersion for the color filter and the pigment dispersion resist composition of the present invention is excellent in transparency, heat resistance and light resistance, it is suitable for color filters used in color liquid crystal displays, color scanners, etc. It can be used suitably.

本発明で用いられる顔料(A)としては、「カラーインデックス便覧」(最新顔料便覧日本顔料技術協会編、1977年刊)、「最新顔料応用技術」(CMC出版、1986年刊)、「印刷インキ技術」(CMC出版、1984年刊)等に記載されているものであって、カラーフィルターに適用可能な顔料であれば、特に制限なく使用できる。   Examples of the pigment (A) used in the present invention include “Color Index Handbook” (latest pigment handbook, edited by Japan Pigment Technology Association, published in 1977), “Latest Pigment Applied Technology” (CMC Publishing, published in 1986), “Printing Ink Technology”. (CMC Publishing Co., Ltd., published in 1984) and the like, and any pigment applicable to a color filter can be used without particular limitation.

このような顔料としては、レッド、グリーン、ブルー、オレンジ、バイオレット、イエローの色相を有する顔料が挙げられる。これら顔料は、単独で用いることも、2種類以上を混合して用いることもできる。   Examples of such pigments include pigments having hues of red, green, blue, orange, violet, and yellow. These pigments can be used alone or in combination of two or more.

また、顔料(A)の1次粒子径は、10〜80nmの範囲にあることが好ましく、さらに、30〜50nmの範囲にあれば、高透明性が得られるので特に好ましい。顔料の1次粒子径が10nm未満では、顔料の凝集性が高くなり、透明性が低下するので好ましくない。また、顔料の1次粒子径が80nmを超えると、充分な透明性が得られないので好ましくない。   Moreover, it is preferable that the primary particle diameter of a pigment (A) exists in the range of 10-80 nm, and also if it exists in the range of 30-50 nm, since high transparency is obtained, it is especially preferable. If the primary particle diameter of the pigment is less than 10 nm, the aggregation property of the pigment is increased and the transparency is lowered, which is not preferable. Further, if the primary particle diameter of the pigment exceeds 80 nm, it is not preferable because sufficient transparency cannot be obtained.

このような1次粒子径の顔料を得る方法としては、例えば、顔料を水溶性有機溶剤及び水の存在下で、水酸化ナトリウム等のアルカリを加えて溶解した後、酸を加えて析出させて微粒子化する方法等が挙げられる。この微粒子化の際、顔料の表面処理を同時に行っても良い。   As a method for obtaining a pigment having such a primary particle size, for example, the pigment is dissolved by adding an alkali such as sodium hydroxide in the presence of a water-soluble organic solvent and water, and then added with an acid to cause precipitation. Examples thereof include a method for forming fine particles. During the fine particle formation, the surface treatment of the pigment may be performed simultaneously.

本発明で用いられる分散剤(B)は、特に限定されるものではないが、例えば、エステル系、アクリル系、ウレタン系等の分散剤が挙げられる。これらの分散剤は、単独で用いることも、2種類以上を混合して用いることもできる。   Although the dispersing agent (B) used by this invention is not specifically limited, For example, dispersing agents, such as ester type, an acrylic type, and a urethane type, are mentioned. These dispersants can be used alone or in combination of two or more.

前記分散剤(B)は、酸価又はアミン価を有するものが好ましく、その酸価が固形分換算で30〜75又はアミン価が固形分換算で20〜60の範囲にあるものが特に好ましい。酸価が30未満であると、光硬化後のアルカリ現像性が低下する傾向にあり、酸価が75を超えると、顔料の充分な分散性が得られず透明性が低下する傾向にあり、好ましくない。また、前記分散剤(B)のアミン価が20未満であると、顔料の充分な分散性が得られず透明性が低下する傾向にあり、アミン価が60を超えると、顔料分散液及び顔料分散レジスト組成物の保存安定性が低下する傾向にあり、好ましくない。   The dispersant (B) preferably has an acid value or an amine value, and particularly preferably has an acid value of 30 to 75 in terms of solid content or an amine value in the range of 20 to 60 in terms of solid content. When the acid value is less than 30, the alkali developability after photocuring tends to decrease, and when the acid value exceeds 75, sufficient dispersibility of the pigment cannot be obtained and the transparency tends to decrease. It is not preferable. When the amine value of the dispersant (B) is less than 20, sufficient dispersibility of the pigment cannot be obtained and the transparency tends to decrease. When the amine value exceeds 60, the pigment dispersion and the pigment The storage stability of the dispersed resist composition tends to decrease, which is not preferable.

また、前記分散剤(B)の重量平均分子量は、5000〜50000の範囲が好ましい。重量平均分子量が5000未満であると、充分な分散性が得られず透明性が低下する傾向にあり、好ましくない。また、重量平均分子量が50000を超えると、顔料分散液の粘度が上昇する傾向にあり、好ましくない。   The weight average molecular weight of the dispersant (B) is preferably in the range of 5000 to 50000. When the weight average molecular weight is less than 5,000, sufficient dispersibility cannot be obtained and transparency tends to be lowered, which is not preferable. Moreover, when the weight average molecular weight exceeds 50000, the viscosity of the pigment dispersion tends to increase, which is not preferable.

前記分散剤(B)の配合量は、固形分換算で顔料100質量部に対して、10〜70質量部の範囲が好ましく、40〜55質量部の範囲が特に好ましい。分散剤の配合量が10質量部未満では、充分な顔料分散性及び透明性が得られない傾向にあり、分散剤の配合量が70質量部を超えると、光硬化後のアルカリ現像性が低下する傾向にあり、好ましくない。   The blending amount of the dispersant (B) is preferably in the range of 10 to 70 parts by weight, particularly preferably in the range of 40 to 55 parts by weight with respect to 100 parts by weight of the pigment in terms of solid content. When the blending amount of the dispersant is less than 10 parts by mass, sufficient pigment dispersibility and transparency tend not to be obtained, and when the blending amount of the dispersant exceeds 70 parts by mass, the alkali developability after photocuring decreases. This is not preferable.

本発明で用いられる顔料分散液には、バインダー樹脂を含有しても良い。このバインダー樹脂は、特に限定されるものではないが、例えば、カルボキシル基及び/又はフェノール性水酸基を有するアクリル系のバインダー樹脂が挙げられる。このバインダー樹脂は、単独で用いることも、2種類以上を混合して用いることもできる。   The pigment dispersion used in the present invention may contain a binder resin. Although this binder resin is not specifically limited, For example, the acrylic binder resin which has a carboxyl group and / or a phenolic hydroxyl group is mentioned. This binder resin can be used alone or in combination of two or more.

前記バインダー樹脂は、酸価を有するものが好ましく、その酸価が固形分換算で50〜150の範囲にあるものが特に好ましい。酸価が50以下であると、光硬化後のアルカリ現像性が低下する傾向にあり、酸価が150を超えると、顔料の充分な分散性が得られず透明性が低下する傾向にあり、好ましくない。   The binder resin preferably has an acid value, and particularly preferably has an acid value in the range of 50 to 150 in terms of solid content. When the acid value is 50 or less, the alkali developability after photocuring tends to decrease, and when the acid value exceeds 150, sufficient dispersibility of the pigment cannot be obtained and the transparency tends to decrease. It is not preferable.

また、前記バインダー樹脂の重量平均分子量は、5000〜50000の範囲が好ましい。前記バインダー樹脂の重量平均分子量が5000未満であると、充分な分散性が得られず透明性が低下する傾向にあり、好ましくない。また、重量平均分子量が50000を超えると、顔料分散液の粘度が上昇する傾向にあり、好ましくない。   The weight average molecular weight of the binder resin is preferably in the range of 5000 to 50000. If the weight average molecular weight of the binder resin is less than 5,000, sufficient dispersibility cannot be obtained and the transparency tends to decrease, which is not preferable. Moreover, when the weight average molecular weight exceeds 50000, the viscosity of the pigment dispersion tends to increase, which is not preferable.

本発明の顔料分散液に前記バインダー樹脂を用いる場合は、その配合量は、固形分換算で顔料100質量部に対して、1〜100質量部の範囲が好ましく、10〜40質量部の範囲が特に好ましい。バインダー樹脂の配合量が、100質量部を超えると、顔料の充分な分散性が得られず透明性が低下する傾向にあり、好ましくない。   When using the said binder resin for the pigment dispersion liquid of this invention, the compounding quantity has the preferable range of 1-100 mass parts with respect to 100 mass parts of pigments in conversion of solid content, and the range of 10-40 mass parts is preferable. Particularly preferred. When the blending amount of the binder resin exceeds 100 parts by mass, sufficient dispersibility of the pigment cannot be obtained and the transparency tends to decrease, which is not preferable.

本発明で用いられる有機溶剤(C)は、分散剤及びバインダー樹脂を溶解し、顔料を安定的に分散させることができるものが好ましい。このような有機溶剤としては、例えば、プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールモノエチルエーテルアセテート等の酢酸エステル系溶剤;エトキシプロピオネート等のプロピオネート系溶剤;トルエン等の芳香族系溶剤;プロピレングリコールモノメチルエーテル、ジエチレングリコールエチルエーテル、ジエチレングリコールジメチルエーテル等のエーテル系溶剤;シクロヘキサノン等のケトン系溶剤;窒素化合物系溶剤等が挙げられる。これらの溶剤は、単独で用いることも、2種類以上を混合して用いることもできる。   The organic solvent (C) used in the present invention is preferably one that can dissolve the dispersant and the binder resin and stably disperse the pigment. Examples of such organic solvents include, for example, acetate solvents such as propylene glycol monomethyl ether acetate and propylene glycol monoethyl ether acetate; propionate solvents such as ethoxypropionate; aromatic solvents such as toluene; propylene glycol monomethyl Examples include ether solvents such as ether, diethylene glycol ethyl ether, and diethylene glycol dimethyl ether; ketone solvents such as cyclohexanone; nitrogen compound solvents, and the like. These solvents can be used alone or in combination of two or more.

本発明のカラーフィルター用顔料分散液は、該顔料分散液中の顔料の平均粒子径及び粒度分布を制御する必要がある。顔料分散液中の顔料の平均粒子径は、80nm以下が好ましく、80nmを超えると充分な透明性が得られない。一方、顔料分散液中の顔料の粒度分布は、下記の式1における(d84−d16)の値が、5〜50nmの範囲にあるのが好ましく、5〜20nmの範囲にあるのが特に好ましい。式1における(d84−d16)の値が、50nmを超えると透明性を得ることが難しく、コントラスト、ろ過性も低下するので好ましくない。
5(nm)≦(d84−d16)≦50(nm) ……(式1)
(式中、d84は、粒度分布の累積曲線が84質量%となる点の粒子径(nm)を表し、d16は、粒度分布の累積曲線が16質量%となる点の粒子径(nm)を表す。)
In the pigment dispersion for color filter of the present invention, it is necessary to control the average particle size and particle size distribution of the pigment in the pigment dispersion. The average particle diameter of the pigment in the pigment dispersion is preferably 80 nm or less, and if it exceeds 80 nm, sufficient transparency cannot be obtained. On the other hand, the particle size distribution of the pigment in the pigment dispersion is preferably such that the value of (d 84 -d 16 ) in the following formula 1 is in the range of 5 to 50 nm, particularly in the range of 5 to 20 nm. preferable. If the value of (d 84 -d 16 ) in Formula 1 exceeds 50 nm, it is difficult to obtain transparency, and contrast and filterability are also deteriorated.
5 (nm) ≦ (d 84 −d 16 ) ≦ 50 (nm) (Formula 1)
(Where d 84 represents the particle size (nm) at which the cumulative curve of particle size distribution is 84% by mass, and d 16 is the particle size (nm at which the cumulative curve of particle size distribution is 16% by mass). )

顔料分散液中の顔料の平均粒子径及び粒度分布を、上記の範囲に調整するためには、ボールミル、サンドミル、ビーズミル、3本ロールミル、ペイントコンディショナー、アトライター、分散撹拌機、超音波分散機等の装置を用いた分散処理が有効である。なお、2種以上の顔料を分散処理する場合は、それぞれの顔料を別々に分散処理した後、混合しても、予め、顔料を混合して分散処理(共分散)しても良い。   In order to adjust the average particle size and particle size distribution of the pigment in the pigment dispersion to the above range, a ball mill, a sand mill, a bead mill, a three roll mill, a paint conditioner, an attritor, a dispersion stirrer, an ultrasonic disperser, etc. Distributed processing using this device is effective. When two or more kinds of pigments are subjected to a dispersion treatment, the respective pigments may be separately dispersed and then mixed, or the pigments may be mixed and dispersed in advance (co-dispersion).

本発明のカラーフィルター用顔料分散レジスト組成物は、本発明の顔料分散液に酸性基を有するアルカリ可溶性バインダー樹脂、光硬化性化合物及び光重合開始剤を添加して調製する。   The pigment dispersion resist composition for a color filter of the present invention is prepared by adding an alkali-soluble binder resin having an acidic group, a photocurable compound and a photopolymerization initiator to the pigment dispersion of the present invention.

前記の酸性基を有するアルカリ可溶性バインダー樹脂は、1分子中に酸性基とエチレン性二重結合を有する単量体と該単量体と共重合可能な単量体とを共重合させたものである。その代表的な例としては、(メタ)アクリル酸と(メタ)アクリル酸エステルとの共重合体が挙げられる。   The alkali-soluble binder resin having an acidic group is obtained by copolymerizing a monomer having an acidic group and an ethylenic double bond in one molecule with a monomer copolymerizable with the monomer. is there. A typical example thereof is a copolymer of (meth) acrylic acid and (meth) acrylic acid ester.

前記の1分子中に酸性基とエチレン性二重結合を有する単量体としては、例えば、(メタ)アクリル酸、p−スチレンカルボン酸、p−スチレンスルホン酸、p−ヒドロキシスチレン、2−(メタ)アクリロイルオキシエチルホスフェート等が挙げられる。これらの中でも、カルボキシル基あるいはフェノール性水酸基を有する単量体を使用すると、現像性が向上するので好ましい。   Examples of the monomer having an acidic group and an ethylenic double bond in one molecule include (meth) acrylic acid, p-styrenecarboxylic acid, p-styrenesulfonic acid, p-hydroxystyrene, 2- ( And (meth) acryloyloxyethyl phosphate. Among these, it is preferable to use a monomer having a carboxyl group or a phenolic hydroxyl group because developability is improved.

前記の(メタ)アクリル酸エステルとしては、例えば、メチル(メタ)アクリレート、エチル(メタ)アクリレート、ブチル(メタ)アクリレート、2−エチルヘキシル(メタ)アクリレート、β−ヒドロキシエチル(メタ)アクリレート、ベンジル(メタ)アクリレート等が挙げられる。   Examples of the (meth) acrylic acid ester include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, β-hydroxyethyl (meth) acrylate, benzyl ( And (meth) acrylate.

前記の1分子中に酸性基とエチレン性二重結合を有する単量体と共重合させることができる上記以外の単量体としては、例えば、スチレン、メチルビニルエーテル、酢酸ビニル、塩化ビニル、N−ビニルピロリドン、アクリルアミド等が挙げられる。   Examples of other monomers that can be copolymerized with monomers having an acidic group and an ethylenic double bond in one molecule include styrene, methyl vinyl ether, vinyl acetate, vinyl chloride, N- Examples include vinyl pyrrolidone and acrylamide.

前記の酸性基を有するアルカリ可溶性バインダー樹脂の酸価は、50〜150の範囲にあれば、現像性が向上するので好ましい。また、該アルカリ可溶性バインダー樹脂の重量平均分子量が5000〜50000の範囲にあれば、現像性が向上するので好ましい。この酸性基を有するアルカリ可溶性バインダー樹脂は、単独で用いることも、2種類以上を混合して用いることもできる。   If the acid value of the alkali-soluble binder resin having an acidic group is in the range of 50 to 150, it is preferable because developability is improved. Moreover, it is preferable if the weight average molecular weight of the alkali-soluble binder resin is in the range of 5000 to 50000, since developability is improved. The alkali-soluble binder resin having an acidic group can be used alone or in combination of two or more.

前記の酸性基を有するアルカリ可溶性バインダー樹脂の配合量は、固形分換算で顔料100質量部に対して、50〜200質量部の範囲であれば、現像性が向上するので好ましい。   The blending amount of the alkali-soluble binder resin having an acidic group is preferably in the range of 50 to 200 parts by mass with respect to 100 parts by mass of the pigment in terms of solid content, because developability is improved.

前記光硬化性化合物は、紫外線や可視光線等の照射により重合又は架橋反応可能な官能基を有する化合物である。このような化合物の代表的なものとして、ラジカル重合性化合物、カチオン重合性化合物が挙げられる。これらの中でも、ラジカル重合性化合物がより好ましい。   The photocurable compound is a compound having a functional group that can be polymerized or cross-linked by irradiation with ultraviolet rays or visible rays. Representative examples of such compounds include radically polymerizable compounds and cationically polymerizable compounds. Among these, radically polymerizable compounds are more preferable.

前記光硬化性化合物としては、例えば、トリメチロールプロパントリ(メタ)アクリレート、ネオペンチルグリコールジ(メタ)アクリレート、ジペンタエリスリトールヘキサ(メタ)アクリレート、トリメチロールプロパントリ(アクリロイルキシプロピル)エーテル、トリ(アクリロイルオキシエチル)イソシアヌレート等の(メタ)アクリル基を有する化合物;スチレン誘導体などが挙げられる。   Examples of the photocurable compound include trimethylolpropane tri (meth) acrylate, neopentyl glycol di (meth) acrylate, dipentaerythritol hexa (meth) acrylate, trimethylolpropane tri (acryloyloxypropyl) ether, tri ( (Acryloyloxyethyl) isocyanurate and other compounds having a (meth) acryl group; styrene derivatives and the like.

これらの光硬化性化合物の中でも、トリメチロールプロパントリ(メタ)アクリレート、ペンタエリスリトールテトラ(メタ)アクリレート、ジペンタエリスリトールヘキサ(メタ)アクリレート、ジペンタエリスリトールペンタ(メタ)アクリレート等の多官能(メタ)アクリレート類が、硬化性が良好なので特に好ましい。これらの光硬化性化合物は、単独で用いることも、2種以上を混合して用いることもできる。   Among these photocurable compounds, polyfunctional (meth) such as trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, dipentaerythritol penta (meth) acrylate, etc. Acrylates are particularly preferred because of their good curability. These photocurable compounds can be used alone or in admixture of two or more.

前記光硬化性化合物の配合量は、特に限定はないが、本発明の顔料分散レジスト組成物に用いられるアルカリ可溶性樹脂100質量部に対して、25〜150質量部の範囲が好ましい。光硬化性化合物の配合量が150質量部を超えると、現像性が低下する傾向にあり、好ましくない。一方、光硬化性化合物の配合量が25質量部未満では、充分な硬化塗膜が得られず、パターン形成が困難になる傾向にあるので好ましくない。   Although the compounding quantity of the said photocurable compound does not have limitation in particular, The range of 25-150 mass parts is preferable with respect to 100 mass parts of alkali-soluble resin used for the pigment dispersion resist composition of this invention. When the blending amount of the photocurable compound exceeds 150 parts by mass, the developability tends to decrease, which is not preferable. On the other hand, if the compounding amount of the photocurable compound is less than 25 parts by mass, a sufficient cured coating film cannot be obtained and pattern formation tends to be difficult, which is not preferable.

本発明のカラーフィルター用顔料分散レジスト組成物に用いられる光重合開始剤は、光により解離してラジカルを発生するものであれば、限定されるものではないが、例えば、4,4’−ビス(ジエチルアミノ)ベンゾフェノン等のベンゾフェノン類;チオキサントン、2−メチルチオキサントン等のキサントン類;p−ジメチルアミノアセトフェノン、α,α−ジクロロ−4−フェノキシアセトフェノン、ベンジル−4−ジメチルアミノベンゾエート、2−(o−クロロフェニル)−4,5−ジフェニルイミダゾリルの2量体、2,4−ビス−トリクロロメチル−6−[ジ−(エトキシカルボニルメチル)アミノ]フェニル−S−トリアジン、2,4−ビス−トリクロロメチル−6−(4−エトキシ)フェニル−S−トリアジン、2,4−ビス−トリクロロメチル−6−(3−ブロモ−4−エトキシ)フェニル−S−トリアジンアントラキノン等が挙げられる。   The photopolymerization initiator used in the pigment-dispersed resist composition for color filters of the present invention is not limited as long as it can be dissociated by light to generate radicals. For example, 4,4′-bis Benzophenones such as (diethylamino) benzophenone; xanthones such as thioxanthone and 2-methylthioxanthone; p-dimethylaminoacetophenone, α, α-dichloro-4-phenoxyacetophenone, benzyl-4-dimethylaminobenzoate, 2- (o- Dimer of chlorophenyl) -4,5-diphenylimidazolyl, 2,4-bis-trichloromethyl-6- [di- (ethoxycarbonylmethyl) amino] phenyl-S-triazine, 2,4-bis-trichloromethyl- 6- (4-Ethoxy) phenyl-S-triazine, 2,4-bi S-trichloromethyl-6- (3-bromo-4-ethoxy) phenyl-S-triazine anthraquinone and the like can be mentioned.

また、前記光重合開始剤に光増感剤を併用することもできる。この光増感剤としては、例えば、アミン類、尿素類、硫黄原子を有する化合物、燐原子を有する化合物、塩素原子を有する化合物又はニトリル類もしくはその他の窒素原子を有する化合物等が挙げられる。これらの光増感剤は、単独で用いることも、2種以上を混合して用いることもできる。   In addition, a photosensitizer can be used in combination with the photopolymerization initiator. Examples of the photosensitizer include amines, ureas, compounds having a sulfur atom, compounds having a phosphorus atom, compounds having a chlorine atom, nitriles or other compounds having a nitrogen atom. These photosensitizers can be used alone or in combination of two or more.

前記光重合開始剤の配合量は、特に限定はないが、顔料分散レジスト組成物中の光硬化性化合物100質量部に対して、0.1〜30質量部の範囲が特に好ましい。0.1質量部未満では、硬化性が低下する傾向にあり、30質量部を超えると、光重合開始剤の結晶の析出し、塗膜物性の劣化を生じる傾向にあるので好ましくない。   The blending amount of the photopolymerization initiator is not particularly limited, but is preferably in the range of 0.1 to 30 parts by mass with respect to 100 parts by mass of the photocurable compound in the pigment-dispersed resist composition. If the amount is less than 0.1 parts by mass, the curability tends to decrease. If the amount exceeds 30 parts by mass, the photopolymerization initiator crystals tend to precipitate and the physical properties of the coating film tend to deteriorate.

本発明の顔料分散組成物及び顔料分散レジスト組成物には、上記の成分以外に、本発明の効果を損なわない範囲で、他の成分を添加しても良い。このような他の成分としては、顔料誘導体、染料、レベリング剤、消泡剤、酸化防止剤、光安定剤等が挙げられる。   In addition to the above components, other components may be added to the pigment dispersion composition and pigment dispersion resist composition of the present invention within a range not impairing the effects of the present invention. Examples of such other components include pigment derivatives, dyes, leveling agents, antifoaming agents, antioxidants, and light stabilizers.

本発明のカラーフィルター用顔料分散レジスト組成物を用いたカラーフィルターは、例えば、以下の工程(1)〜(5)にしたがって、作製することができる。
(1)カラーフィルター用顔料分散レジスト組成物のカラーフィルター用基板への塗布工程
(2)塗布した該顔料分散レジスト組成物の加熱乾燥(プリベーク)工程
(3)フォトマスクを用いて、紫外線あるいは可視光を照射して塗膜を硬化する露光工程
(4)未露光部分をアルカリ現像液で除去する現像工程
(5)加熱処理して、硬化塗膜をさらに熱硬化するポストベーク工程
A color filter using the pigment-dispersed resist composition for a color filter of the present invention can be produced, for example, according to the following steps (1) to (5).
(1) Application process of pigment dispersion resist composition for color filter to color filter substrate (2) Heat drying (pre-bake) process of the applied pigment dispersion resist composition (3) UV or visible using photomask An exposure process for irradiating light to cure the coating film (4) A development process for removing unexposed portions with an alkaline developer (5) A post-baking process for further heat curing the cured coating film

上記の各工程について、以下に詳細に説明する。
(1)塗布工程
本発明のカラーフィルター用顔料分散レジスト組成物をカラーフィルター用基板表面に塗布する方法としては、例えば、印刷法、スプレー法、ロールコート法、バーコート法、カーテンコート法、スピンコート法等の方法を用いることができる。
Each of the above steps will be described in detail below.
(1) Coating process Examples of the method for coating the color filter pigment-dispersed resist composition of the present invention on the color filter substrate surface include, for example, printing, spraying, roll coating, bar coating, curtain coating, and spin coating. A method such as a coating method can be used.

(2)加熱乾燥(プリベーク)工程
カラーフィルター用基板に塗布した顔料分散レジスト組成物の塗膜の乾燥条件は、各成分の種類、配合比率等によって異なるが、50〜150℃で、1〜15分間程度が好ましい。
(2) Heat drying (pre-baking) process The drying conditions of the coating film of the pigment-dispersed resist composition applied to the color filter substrate vary depending on the type of each component, the blending ratio, etc. Minutes are preferred.

(3)露光工程
プリベークして得られた顔料分散レジスト組成物の乾燥塗膜に、所定のパターンのマスクを介して、各種のエネルギー線を照射することにより、塗膜を光硬化させることができる。このようなエネルギー線の中でも、200〜500nmの波長範囲の紫外線又は可視光を用いることが好ましく、短波長でエネルギーの高い紫外線を用いるとより好ましい。紫外線又は可視光の光源としては、フォトファブリケーションの分野で広く使用されているものを使用することができ、例えば、低圧水銀ランプ、高圧水銀ランプ、超高圧水銀ランプ、メタルハライドランプ、ケミカルランプ、ブラックライトランプ、水銀−キセノンランプ、エキシマーランプ、ショートアーク灯、ヘリウム・カドミウムレーザー、アルゴンレーザー、Nd−YAGレーザーを用いたTHGやFHG光レーザー等が挙げられる。光源としてレーザーを使用した場合は、フォトマスクを使用しないで、顔料分散レジスト組成物の塗膜を直接画素パターンに光硬化することができる。
(3) Exposure process A coating film can be photocured by irradiating various energy rays to the dried coating film of the pigment dispersion resist composition obtained by prebaking through a mask having a predetermined pattern. . Among such energy rays, it is preferable to use ultraviolet light or visible light having a wavelength range of 200 to 500 nm, and it is more preferable to use ultraviolet light having a short wavelength and high energy. As a light source of ultraviolet or visible light, those widely used in the field of photofabrication can be used. For example, a low pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a metal halide lamp, a chemical lamp, black Examples include a light lamp, a mercury-xenon lamp, an excimer lamp, a short arc lamp, a helium / cadmium laser, an argon laser, and a THG or FHG laser using an Nd-YAG laser. When a laser is used as the light source, the coating film of the pigment-dispersed resist composition can be directly photocured into a pixel pattern without using a photomask.

(4)現像工程
現像工程で用いるアルカリ現像液としては、例えば、水酸化ナトリウム、水酸化カリウム、炭酸ナトリウム、トリメチルアンモニウムヒドロキシルド等の水溶液が挙げられる。なお、アルカリ現像液中に、メタノール、エタノール、イソプロパノール等の水溶性有機溶剤、界面活性剤を添加してもよい。また、現像方法は、液盛り法、ディッピング法、スプレー法等のいずれの方法を用いても良い。現像後は、硬化塗膜を流水により洗浄し、圧縮空気又は圧縮窒素ガスを吹きかけて乾燥させる。
(4) Development step Examples of the alkaline developer used in the development step include aqueous solutions of sodium hydroxide, potassium hydroxide, sodium carbonate, trimethylammonium hydroxide, and the like. A water-soluble organic solvent such as methanol, ethanol, isopropanol, or a surfactant may be added to the alkali developer. Further, as a developing method, any method such as a liquid piling method, a dipping method, a spray method or the like may be used. After development, the cured coating film is washed with running water and dried by blowing compressed air or compressed nitrogen gas.

(5)ポストベーク工程
現像工程で得られた光硬化性着色組成物の硬化塗膜を有する基板を、ホットプレート、オーブン等の加熱装置により、100〜280℃でポストベークすることで、耐熱性、透明性等に優れた塗膜が得られる。
(5) Post-bake process The substrate having a cured coating film of the photocurable coloring composition obtained in the development process is post-baked at 100 to 280 ° C. with a heating device such as a hot plate or an oven to provide heat resistance. A coating film excellent in transparency and the like can be obtained.

以下に実施例及び比較例を挙げて、本発明をさらに詳細に説明するが、本発明はこれら実施例の範囲に限定されるものではない。なお、以下における「部」及び「%」は、特に断りがない限り、すべて質量基準であるものとする。   EXAMPLES The present invention will be described in more detail with reference to examples and comparative examples below, but the present invention is not limited to the scope of these examples. In the following, “part” and “%” are based on mass unless otherwise specified.

(実施例1)
C.I.ピグメントイエロー138(BASF社製の製品名「パリオトールイエロー0961HD」)10部、10%の水を含有するジメチルインダゾリジノン100部及び水酸化ナトリウム3部をフラスコに取り、窒素雰囲気下、35℃で3時間撹拌して、C.I.ピグメントイエロー138を溶解して溶液とした。次に、この溶液の温度を50℃にして、撹拌しながら20℃の80%酢酸5部を3分間で投入した。この温度で充分に均質なスラリー状を保つようにして4時間撹拌を行った。その後、撹拌しながら水100部を投入してスラリーの濃度を下げ、ろ過した後、濾取した残さを60℃の湯を用いて洗浄した後、乾燥させて微粒子化顔料(PY−1)を得た。この微粒子化顔料(PY−1)の1次粒子径は20〜70nmであった。
(Example 1)
C. I. Pigment Yellow 138 (BASF product name “Pariotol Yellow 0961HD”) 10 parts, 100 parts of dimethylindazolidinone containing 10% water and 3 parts of sodium hydroxide were placed in a flask and placed at 35 ° C. under a nitrogen atmosphere. For 3 hours and C.I. I. Pigment Yellow 138 was dissolved into a solution. Next, the temperature of this solution was set to 50 ° C., and 5 parts of 80% acetic acid at 20 ° C. was added over 3 minutes while stirring. Stirring was carried out for 4 hours while maintaining a sufficiently homogeneous slurry at this temperature. Thereafter, 100 parts of water was added while stirring to lower the concentration of the slurry, and after filtration, the residue collected by filtration was washed with hot water at 60 ° C. and then dried to obtain a finely divided pigment (PY-1). Obtained. The primary particle diameter of the micronized pigment (PY-1) was 20 to 70 nm.

次に、直径0.5mmのジルコニアビーズを仕込んだ高速分散機(五十嵐機械製造社製の製品名「TSG−6H」)に、上記で得られた微粒子化顔料(PY−1)15部、アクリル系分散剤(D−1)(ビックケミー社製の製品名「BYK−2001」)4.5部及びプロピレングリコールモノメチルエーテルアセテート(以下、「PGMAc」と略す。)80.5部を仕込み、毎分2000回転で8時間分散させて、イエロー顔料分散液(DY−1)を得た。このイエロー顔料分散液(DY−1)中の顔料の平均粒子径は50nmで、式1における(d84−d16)の値は25nmであった。 Next, 15 parts of the finely divided pigment (PY-1) obtained above was added to a high-speed disperser (product name “TSG-6H” manufactured by Igarashi Machinery Co., Ltd.) charged with zirconia beads having a diameter of 0.5 mm, acrylic Dispersing agent (D-1) (product name “BYK-2001” manufactured by Big Chemie) 4.5 parts and propylene glycol monomethyl ether acetate (hereinafter abbreviated as “PGMAc”) 80.5 parts were charged every minute. The mixture was dispersed at 2000 rpm for 8 hours to obtain a yellow pigment dispersion (DY-1). The average particle diameter of the pigment in this yellow pigment dispersion (DY-1) was 50 nm, and the value of (d 84 -d 16 ) in Formula 1 was 25 nm.

上記で得られたイエロー顔料分散液(DY−1)100部、アクリル系バインダー樹脂溶液(大日本インキ化学工業株式会社製の製品名「エクセディック バインダー LC−295」、固形分40%)17.5部、ジペンタエリスリトールヘキサアクリレート(以下、「DPHA」と略す。)7.0部、光重合開始剤(チバ・スペシャルティ・ケミカルズ社製の製品名「IRGACURE 369」)0.3部及びPGMAc78.2部を撹拌混合した後、孔径1.0μmのフィルターを用いてろ過し、顔料分散レジスト組成物(R−1)を得た。   16. 100 parts of the yellow pigment dispersion (DY-1) obtained above, an acrylic binder resin solution (product name “Exedic Binder LC-295” manufactured by Dainippon Ink & Chemicals, Inc., solid content 40%) 5 parts, 7.0 parts of dipentaerythritol hexaacrylate (hereinafter abbreviated as “DPHA”), 0.3 part of a photopolymerization initiator (product name “IRGACURE 369” manufactured by Ciba Specialty Chemicals) and 78 parts of PGMAc. After mixing 2 parts with stirring, the mixture was filtered using a filter having a pore size of 1.0 μm to obtain a pigment-dispersed resist composition (R-1).

(実施例2)
実施例1で用いたC.I.ピグメントイエロー138に代えて、C.I.ピグメントイエロー150(バイエル社製の製品名「イエローピグメントE4GN」)を用いた以外は実施例1と同様にして、微粒子化顔料(PY−2)、イエロー顔料分散液(DY−2)及び顔料分散レジスト組成物(R−2)を得た。この微粒子化顔料(PY−2)顔料の1次粒子径は20〜70nmであった。また、イエロー顔料分散液(DY−2)中の顔料の平均粒子径は60nmで、式1における(d84−d16)の値は40nmであった。
(Example 2)
C. used in Example 1 I. In place of Pigment Yellow 138, C.I. I. Pigment Yellow 150 (product name “Yellow Pigment E4GN” manufactured by Bayer Co., Ltd.) was used in the same manner as in Example 1 except that finely divided pigment (PY-2), yellow pigment dispersion (DY-2), and pigment dispersion were used. A resist composition (R-2) was obtained. The primary particle diameter of the micronized pigment (PY-2) pigment was 20 to 70 nm. Further, the average particle diameter of the pigment in the yellow pigment dispersion (DY-2) was 60 nm, and the value of (d 84 -d 16 ) in Formula 1 was 40 nm.

(実施例3)
実施例1で用いたC.I.ピグメントイエロー138に代えて、C.I.ピグメントグリーン36(大日本インキ化学工業株式会社製の製品名「ファーストゲン グリーン 2YK」)を用いた以外は実施例1と同様にして、微粒子化顔料(PG−1)及びグリーン顔料分散液(DG−1)を得た。微粒子化顔料(PG−1)の1次粒子径は15〜70nmであった。このグリーン顔料分散液(DG−1)中の顔料の平均粒子径は60nmで、式1における(d84−d16)の値は40nmであった。
(Example 3)
C. used in Example 1 I. In place of Pigment Yellow 138, C.I. I. Pigment Green 36 (product name “Fastgen Green 2YK” manufactured by Dainippon Ink & Chemicals, Inc.) was used in the same manner as in Example 1 except that the finely divided pigment (PG-1) and the green pigment dispersion (DG -1) was obtained. The primary particle diameter of the micronized pigment (PG-1) was 15 to 70 nm. The average particle diameter of the pigment in this green pigment dispersion (DG-1) was 60 nm, and the value of (d 84 -d 16 ) in Formula 1 was 40 nm.

上記で得られたグリーン顔料分散液(DG−1)60部、イエロー顔料分散液(DY−1)40部、アクリル系バインダー樹脂溶液(大日本インキ化学工業株式会社製の製品名「エクセディック バインダー LC−295」、固形分40%)17.5部、DPHA7.0部、光重合開始剤(チバ・スペシャルティ・ケミカルズ社製の製品名「IRGACURE 369」)0.3部及びPGMAc78.2部を撹拌混合した後、孔径1.0μmのフィルターを用いてろ過し、顔料分散レジスト組成物(R−3)を得た。   60 parts of the green pigment dispersion (DG-1) obtained above, 40 parts of the yellow pigment dispersion (DY-1), an acrylic binder resin solution (product name “Exedic Binder, manufactured by Dainippon Ink and Chemicals, Inc.”) LC-295 ", solid content 40%) 17.5 parts, DPHA 7.0 parts, photopolymerization initiator (product name" IRGACURE 369 "manufactured by Ciba Specialty Chemicals) 0.3 parts and PGMac 78.2 parts After stirring and mixing, the mixture was filtered using a filter having a pore size of 1.0 μm to obtain a pigment-dispersed resist composition (R-3).

(実施例4)
実施例3で用いたグリーン顔料分散液(DG−1)60部を70部に、イエロー顔料分散液(DY−1)40部を実施例2で得られたイエロー顔料分散液(DY−2)30部にした以外は実施例3と同様にして、顔料分散レジスト組成物(R−4)を得た。
Example 4
70 parts of the green pigment dispersion (DG-1) used in Example 3 is 70 parts, and 40 parts of the yellow pigment dispersion (DY-1) is the yellow pigment dispersion (DY-2) obtained in Example 2. A pigment-dispersed resist composition (R-4) was obtained in the same manner as in Example 3 except that the amount was 30 parts.

(比較例1)
C.I.ピグメントイエロー138(BASF社製の製品名「パリオトールイエロー0961HD」)をソルベントソルトミリング法で微粒子化し、微粒子化顔料(PY−3)を得た。この微粒子化顔料(PY−3)の1次粒子径は10〜70nmであった。
(Comparative Example 1)
C. I. Pigment Yellow 138 (product name “Pariotol Yellow 0961HD” manufactured by BASF) was finely divided by a solvent salt milling method to obtain a finely divided pigment (PY-3). The primary particle diameter of the micronized pigment (PY-3) was 10 to 70 nm.

次に、直径0.5mmのジルコニアビーズを仕込んだ高速分散機(五十嵐機械製造社製の製品名「TSG−6H」)に、上記で得られた微粒子化顔料(PY−3)15部、アクリル系分散剤(D−1)(ビックケミー社製の製品名「BYK−2001」)4.5部及びPGMAc80.5部を仕込み、毎分2000回転で8時間分散させて、イエロー顔料分散液(DY−3)を得た。このイエロー顔料分散液(DY−3)中の顔料の平均粒子径は90nmで、式1における(d84−d16)の値は65nmであった。 Next, in a high-speed disperser (product name “TSG-6H” manufactured by Igarashi Machinery Co., Ltd.) charged with zirconia beads having a diameter of 0.5 mm, 15 parts of the finely divided pigment (PY-3) obtained above, acrylic System dispersant (D-1) (product name “BYK-2001” manufactured by Big Chemie Co., Ltd.) 4.5 parts and PGMac 80.5 parts were charged and dispersed at 2000 rpm for 8 hours to obtain a yellow pigment dispersion (DY -3) was obtained. The average particle diameter of the pigment in this yellow pigment dispersion (DY-3) was 90 nm, and the value of (d 84 -d 16 ) in Formula 1 was 65 nm.

上記で得られたイエロー顔料分散液(DY−3)100部、アクリル系バインダー樹脂溶液(大日本インキ化学工業株式会社製の製品名「エクセディック バインダー LC−295」、固形分40%)17.5部、DPHA7.0部、光重合開始剤(チバ・スペシャルティ・ケミカルズ社製の「IRGACURE 369」)0.3部及びPGMAc78.2部を撹拌混合した後、孔径1.0μmのフィルターを用いてろ過し、顔料分散レジスト組成物(R−C1)を得た。   16. 100 parts of the yellow pigment dispersion (DY-3) obtained above, an acrylic binder resin solution (product name “Exec Binder LC-295” manufactured by Dainippon Ink & Chemicals, Inc., solid content 40%) 5 parts, 7.0 parts of DPHA, 0.3 part of photopolymerization initiator (“IRGACURE 369” manufactured by Ciba Specialty Chemicals) and 78.2 parts of PGMAc were stirred and mixed, and then a filter having a pore size of 1.0 μm was used. Filtration was performed to obtain a pigment-dispersed resist composition (R-C1).

(比較例2)
比較例1で用いたC.I.ピグメントイエロー138に代えて、C.I.ピグメントイエロー150(バイエル社製の製品名「イエローピグメントE4GN」)を用いた以外は比較例1と同様にして、微粒子化顔料(PY−4)、イエロー顔料分散液(DY−4)及び顔料分散レジスト組成物(R−C2)を得た。この微粒子化顔料(PY−4)の1次粒子径は25〜75nmであった。また、イエロー顔料分散液(DY−4)中の顔料の平均粒子径は90nmで、式1における(d84−d16)の値は75nmであった。
(Comparative Example 2)
C. used in Comparative Example 1 I. In place of Pigment Yellow 138, C.I. I. Pigment Yellow 150 (product name “Yellow Pigment E4GN” manufactured by Bayer) was used in the same manner as in Comparative Example 1 except that finely divided pigment (PY-4), yellow pigment dispersion (DY-4), and pigment dispersion were used. A resist composition (R-C2) was obtained. The primary particle diameter of the finely divided pigment (PY-4) was 25 to 75 nm. Moreover, the average particle diameter of the pigment in the yellow pigment dispersion (DY-4) was 90 nm, and the value of (d 84 -d 16 ) in Formula 1 was 75 nm.

(比較例3)
比較例1で用いたC.I.ピグメントイエロー138に代えて、C.I.ピグメントグリーン36(大日本インキ化学工業株式会社製の製品名「ファーストゲン グリーン 2YK」)を用いた以外は比較例1と同様にして、微粒子化顔料(PG−2)及びグリーン顔料分散液(DG−2)を得た。微粒子化顔料(PG−2)の1次粒子径は30〜75nmであった。また、このグリーン顔料分散液(DG−2)中の顔料の平均粒子径は90nmで、式1における(d84−d16)の値は80nmであった。
(Comparative Example 3)
C. used in Comparative Example 1 I. In place of Pigment Yellow 138, C.I. I. Pigment Green 36 (product name “Fastgen Green 2YK” manufactured by Dainippon Ink and Chemicals, Inc.) was used in the same manner as in Comparative Example 1, except that the finely divided pigment (PG-2) and the green pigment dispersion (DG -2) was obtained. The primary particle diameter of the micronized pigment (PG-2) was 30 to 75 nm. Further, the average particle size of the pigment in the green pigment dispersion (DG-2) is 90 nm, the value of the formula 1 (d 84 -d 16) was 80 nm.

次に、上記で得られたグリーン顔料分散液(DG−2)60部、実施例1で得られたイエロー顔料分散液(DY−1)40部、アクリル系バインダー樹脂(大日本インキ化学工業株式会社製の製品名「エクセディック バインダー LC−295」)17.5部、DPHA7.0部、光重合開始剤(チバ・スペシャルティ・ケミカルズ社製の製品名「IRGACURE 369」)0.3部及びPGMAc78.2部を撹拌混合した後、孔径1.0μmのフィルターを用いてろ過し、顔料分散レジスト組成物(R−C3)を得た。   Next, 60 parts of the green pigment dispersion (DG-2) obtained above, 40 parts of the yellow pigment dispersion (DY-1) obtained in Example 1, acrylic binder resin (Dainippon Ink Chemical Co., Ltd.) 17.5 parts of product name “Exec Binder LC-295” manufactured by the company, 7.0 parts of DPHA, 0.3 part of photopolymerization initiator (product name “IRGACURE 369” manufactured by Ciba Specialty Chemicals) and PGMac 78 After stirring and mixing 2 parts, the mixture was filtered using a filter having a pore size of 1.0 μm to obtain a pigment dispersion resist composition (R-C3).

(比較例4)
比較例3で用いたイエロー顔料分散液(DY−1)40部を実施例2で得られたイエロー顔料分散液(DY−2)30部に、グリーン顔料分散液(DG−2)60部を70部にした以外は比較例3と同様にして、顔料分散レジスト組成物(R−C4)を得た。
(Comparative Example 4)
40 parts of the yellow pigment dispersion liquid (DY-1) used in Comparative Example 3 was added to 30 parts of the yellow pigment dispersion liquid (DY-2) obtained in Example 2, and 60 parts of the green pigment dispersion liquid (DG-2) was added. A pigment-dispersed resist composition (R-C4) was obtained in the same manner as in Comparative Example 3 except that the amount was 70 parts.

(比較例5)
C.I.ピグメントイエロー138(BASF社製の製品名「パリオトールイエロー0961HD」)をソルベントソルトミリング法で微粒子化し、微粒子化顔料(PY−5)を得た。この微粒子化顔料(PY−5)の1次粒子径は50〜120nmであった。
(Comparative Example 5)
C. I. Pigment Yellow 138 (product name “Paliotol Yellow 0961HD” manufactured by BASF) was finely divided by a solvent salt milling method to obtain a finely divided pigment (PY-5). The primary particle diameter of the micronized pigment (PY-5) was 50 to 120 nm.

上記で得られた微粒子化顔料(PY−5)を、比較例1と同様の方法で分散し、イエロー顔料分散液(DY−5)を得た。このイエロー顔料分散液(DY−5)中の顔料の平均粒子径は80nmで、式1における(d84−d16)の値は50nmであった。 The finely divided pigment (PY-5) obtained above was dispersed by the same method as in Comparative Example 1 to obtain a yellow pigment dispersion (DY-5). The average particle diameter of the pigment in this yellow pigment dispersion (DY-5) was 80 nm, and the value of (d 84 -d 16 ) in Formula 1 was 50 nm.

次に、実施例3で得られたグリーン顔料分散液(DG−1)60部、上記で得られたイエロー顔料分散液(DY−5)40部、アクリル系バインダー樹脂(大日本インキ化学工業株式会社製の製品名「エクセディック バインダー LC−295」)17.5部、DPHA7.0部、光重合開始剤(チバ・スペシャルティ・ケミカルズ社製の製品名「IRGACURE 369」)0.3部及びPGMAc78.2部を撹拌混合した後、孔径1.0μmのフィルターを用いてろ過し、顔料分散レジスト組成物(R−C5)を得た。   Next, 60 parts of the green pigment dispersion (DG-1) obtained in Example 3, 40 parts of the yellow pigment dispersion (DY-5) obtained above, acrylic binder resin (Dainippon Ink and Chemicals Inc.) 17.5 parts of product name “Exec Binder LC-295” manufactured by the company, 7.0 parts of DPHA, 0.3 part of photopolymerization initiator (product name “IRGACURE 369” manufactured by Ciba Specialty Chemicals) and PGMac 78 Then, 2 parts were mixed with stirring, followed by filtration using a filter having a pore size of 1.0 μm to obtain a pigment-dispersed resist composition (R-C5).

(比較例6)
比較例5で得られたイエロー微粒子化顔料(PY−5)を用いて、比較例1の分散条件を毎分2000回転で8時間から、毎分2000回転で2時間に変更して分散し、イエロー顔料分散液(DY−6)を得た。このイエロー顔料分散液(DY−6)中の顔料の平均粒子径は100nmで、式1における(d84−d16)の値は100nmであった。
(Comparative Example 6)
Using the yellow micronized pigment (PY-5) obtained in Comparative Example 5, the dispersion condition of Comparative Example 1 was changed from 2000 hours per minute at 8 hours to 2000 hours per minute for 2 hours and dispersed. A yellow pigment dispersion (DY-6) was obtained. The average particle diameter of the pigment in this yellow pigment dispersion (DY-6) was 100 nm, and the value of (d 84 -d 16 ) in Formula 1 was 100 nm.

イエロー顔料分散液(DY−1)を上記で得られたイエロー顔料分散液(DY−6)に代えた以外は比較例3と同様にして、顔料分散レジスト組成物(R−C6)を得た。   A pigment dispersion resist composition (R-C6) was obtained in the same manner as in Comparative Example 3 except that the yellow pigment dispersion (DY-1) was replaced with the yellow pigment dispersion (DY-6) obtained above. .

上記の実施例及び比較例で得られた顔料分散液及び顔料分散レジスト組成物の評価は、以下の方法で行った。   The pigment dispersions and pigment dispersion resist compositions obtained in the above examples and comparative examples were evaluated by the following methods.

(微粒子化顔料の1次粒子径)
顔料の電子顕微鏡写真を撮り、その写真より測定した。
(Primary particle diameter of micronized pigment)
An electron micrograph of the pigment was taken and measured from the photograph.

(顔料分散液中の顔料の平均粒子径及び粒度分布)
光散乱型粒度分布計(LEEDS&NORTHRUP社製の製品名「Microtrac UPA」)を用いて、平均粒子径及び粒度分布を測定した。
(Average particle size and particle size distribution of the pigment in the pigment dispersion)
The average particle size and the particle size distribution were measured using a light scattering type particle size distribution meter (product name “Microtrac UPA” manufactured by LEEDS & NORTH UP).

(顔料分散液及び顔料分散レジスト組成物の保存安定性試験)
トキメック社製のE型粘度計を用いて、顔料分散液及び顔料分散レジスト組成物の初期粘度を測定した。測定後、当該組成物をガラス容器中で密閉し、40℃で24時間保存した後、同様の方法で粘度を測定した。得られた初期粘度と40℃で24時間保存後の粘度から、下式を用いて、粘度の変化率を算出した。この変化率から、以下の基準で保存安定性を評価した。
○:変化率が10.0%未満、×:変化率が10.0%以上
(Storage stability test of pigment dispersion and pigment dispersion resist composition)
The initial viscosity of the pigment dispersion and the pigment dispersion resist composition was measured using an E-type viscometer manufactured by Tokimec. After the measurement, the composition was sealed in a glass container and stored at 40 ° C. for 24 hours, and then the viscosity was measured by the same method. From the obtained initial viscosity and the viscosity after storage at 40 ° C. for 24 hours, the rate of change in viscosity was calculated using the following formula. From this rate of change, storage stability was evaluated according to the following criteria.
○: Change rate is less than 10.0%, ×: Change rate is 10.0% or more

Figure 2005195941
Figure 2005195941

(評価用着色硬化塗膜の作製)
上記の実施例及び比較例で得られた顔料分散レジスト組成物をガラス板上に滴下し、スピンコーター(回転数1000/分で9秒間回転)を用いて塗布した後、60℃で5分間予備乾燥して、厚さ1.5μmの塗膜を形成させた。得られた塗膜に線幅50μmのパターンが得られるマスクを用い、高圧水銀灯で1000J/mの照射量で露光した後、アルカリ現像液(株式会社アイテス製の製品名「ID19A1」、ジエタノールアミン)を純水で30倍希釈した現像液(pH=10.82)を使用し、30℃で現像を行った。現像した後、得られた塗膜を純水で洗浄し、評価用着色硬化塗膜を得た。
(Preparation of colored cured coating film for evaluation)
The pigment-dispersed resist compositions obtained in the above examples and comparative examples are dropped on a glass plate and applied using a spin coater (rotated for 9 seconds at a rotation speed of 1000 / min), and then preliminarily reserved at 60 ° C. for 5 minutes. It dried and formed the coating film with a thickness of 1.5 micrometers. The resulting coating film was exposed to a high-pressure mercury lamp at a dose of 1000 J / m 2 using a mask capable of obtaining a pattern with a line width of 50 μm, and then an alkaline developer (product name “ID19A1” manufactured by AITES Co., Ltd., diethanolamine) Development was performed at 30 ° C. using a developer (pH = 10.82) diluted 30 times with pure water. After development, the resulting coating film was washed with pure water to obtain a colored cured coating film for evaluation.

(塗膜現像性試験)
上記で得られた評価用着色硬化塗膜の線幅50μmのパターンを光学顕微鏡で観察し、その結果から以下の基準で塗膜現像性を評価した。
◎:パターン化が非常に良好、○:パターン化が可能、×:パターン化不可
(Coating film developability test)
A pattern with a line width of 50 μm of the colored cured coating film for evaluation obtained above was observed with an optical microscope, and the coating film developability was evaluated based on the results based on the following criteria.
◎: Very good patterning, ○: Can be patterned, ×: Unpatternable

(透明性試験及び色度の測定)
上記で得られた評価用着色硬化塗膜を顕微分光測定装置(オリンパス社製の製品名「OSP−SP−200」)を用いて測定し、CIE表色系におけるY値から、以下の基準で透明性を評価した。また、CIE表色系における色度(x、y値)も測定した。
[イエロー硬化塗膜の評価基準]
○:Y値が87.0以上、×:Y値が87.0未満
[グリーン硬化塗膜の評価基準]
○:Y値が58.0以上、×:Y値が58.0未満
(Transparency test and chromaticity measurement)
The colored cured coating film for evaluation obtained above was measured using a microspectrophotometer (product name “OSP-SP-200” manufactured by Olympus Corporation), and from the Y value in the CIE color system, the following criteria were used. Transparency was evaluated. Further, the chromaticity (x, y value) in the CIE color system was also measured.
[Evaluation criteria for yellow cured coating film]
○: Y value is 87.0 or more, X: Y value is less than 87.0 [Evaluation criteria of green cured coating film]
○: Y value is 58.0 or more, X: Y value is less than 58.0

(耐熱性試験)
上記で得られた評価用着色硬化塗膜を280℃で30分間加熱後、透明性の評価と同様にして、CIE表色系における透明性(Y値)を測定した。この加熱後のY値と透明性の評価で得られたY値との差(△Y値)から、以下の基準で耐熱性を評価した。
◎:△Yが0.3未満、○:△Yが0.3以上0.5未満、×:△Yが0.5以上
(Heat resistance test)
The colored cured coating film for evaluation obtained above was heated at 280 ° C. for 30 minutes, and the transparency (Y value) in the CIE color system was measured in the same manner as the evaluation of transparency. From the difference (ΔY value) between the Y value after heating and the Y value obtained in the evaluation of transparency, the heat resistance was evaluated according to the following criteria.
A: ΔY is less than 0.3, B: ΔY is 0.3 or more and less than 0.5, X: ΔY is 0.5 or more.

(耐光性試験)
上記で得られた評価用着色硬化塗膜にキセノンフェードメーター(スガ試験機社製の製品名「WEL−25AX−HC−B・EL」)を用いて300時間照射した。次に、照射前後の着色硬化塗膜の測色を顕微分光測定装置(オリンパス社製の製品名「OSP−SP−200」)を用いて行い、その測定値から△Eを算出し、以下の基準で耐光性を評価した。
○:△Eが3.0未満、×:△E3.0以上
(Light resistance test)
The colored cured coating film for evaluation obtained above was irradiated for 300 hours using a xenon fade meter (product name “WEL-25AX-HC-B • EL” manufactured by Suga Test Instruments Co., Ltd.). Next, color measurement of the colored cured coating film before and after irradiation is performed using a microspectrophotometer (product name “OSP-SP-200” manufactured by Olympus), ΔE is calculated from the measured value, and The light resistance was evaluated according to the standard.
○: ΔE is less than 3.0, ×: ΔE3.0 or more

実施例及び比較例で得られた微粒子化顔料の1次粒子径、顔料分散液中の顔料の平均粒子径及び式1における(d84−d16)の値を表1に示す。また、実施例及び比較例で得られたイエロー顔料分散レジスト組成物の評価結果を表2に、グリーン顔料分散レジスト組成物の評価結果を表3に示す。 Table 1 shows the primary particle diameter of the micronized pigment obtained in Examples and Comparative Examples, the average particle diameter of the pigment in the pigment dispersion, and the value of (d 84 -d 16 ) in Formula 1. Table 2 shows the evaluation results of the yellow pigment-dispersed resist compositions obtained in Examples and Comparative Examples, and Table 3 shows the evaluation results of the green pigment-dispersed resist compositions.

Figure 2005195941
Figure 2005195941

表1中の略号は、以下のものを表す。
Y138:C.I.ピグメントイエロー138
Y150:C.I.ピグメントイエロー150
G36:C.I.ピグメントグリーン36
The abbreviations in Table 1 represent the following.
Y138: C.I. I. Pigment Yellow 138
Y150: C.I. I. Pigment Yellow 150
G36: C.I. I. Pigment Green 36

Figure 2005195941
Figure 2005195941

表2中の略号は、以下のものを表す。
LC−295:エクセディック バインダー LC−295
Irg.369:IRGACURE 369
Abbreviations in Table 2 represent the following.
LC-295: EXEDIC Binder LC-295
Irg. 369: IRGACURE 369

Figure 2005195941
Figure 2005195941

表1に示した結果から、本発明の顔料分散液(DY−1、DY−2及びDG−1)は、優れた保存安定性を有していることが分かった。   From the results shown in Table 1, it was found that the pigment dispersions (DY-1, DY-2, and DG-1) of the present invention have excellent storage stability.

また、表2及び表3に示した結果から、実施例1〜4の本発明のカラーフィルター用顔料分散レジスト組成物は、保存安定性に優れ、かつ優れた塗膜現像性を有していることが分かった。さらに、本発明のカラーフィルター用顔料分散レジスト組成物の着色硬化塗膜は、透明性、耐熱性及び耐光性に優れていることが分かった。   Further, from the results shown in Tables 2 and 3, the pigment dispersed resist compositions for color filters of the present invention of Examples 1 to 4 are excellent in storage stability and have excellent coating film developability. I understood that. Furthermore, it turned out that the colored cured coating film of the pigment dispersion resist composition for color filters of this invention is excellent in transparency, heat resistance, and light resistance.

表1で示した顔料分散液DY−3は、用いた顔料の1次粒子径は10〜80nmの範囲に入るが、分散後の顔料分散液中の顔料の平均粒子径が80nmを超え、粒度分布が式1の条件を満たしていない例である。この顔料分散液は、保存安定性が不充分であった。   In the pigment dispersion DY-3 shown in Table 1, the primary particle diameter of the pigment used is in the range of 10 to 80 nm, but the average particle diameter of the pigment in the pigment dispersion after dispersion exceeds 80 nm, and the particle size This is an example in which the distribution does not satisfy the condition of Equation 1. This pigment dispersion had insufficient storage stability.

表1で示した顔料分散液DY−4は、用いた顔料の1次粒子径は10〜80nmの範囲に入るが、分散後の顔料分散液中の顔料の平均粒子径が80nmを超え、粒度分布が式1の条件を満たしていない例である。この顔料分散液は、保存安定性が不充分であった。   In the pigment dispersion DY-4 shown in Table 1, the primary particle diameter of the pigment used falls within the range of 10 to 80 nm, but the average particle diameter of the pigment in the pigment dispersion after dispersion exceeds 80 nm, and the particle size This is an example in which the distribution does not satisfy the condition of Equation 1. This pigment dispersion had insufficient storage stability.

表1で示した顔料分散液DY−5は、用いた顔料の1次粒子径は10〜80nmの範囲を外れるが、分散後の顔料分散液中の顔料の平均粒子径が80nm以下で、粒度分布が式1の条件を満たした例である。この顔料分散液は、保存安定性が不充分であった。   In the pigment dispersion DY-5 shown in Table 1, the primary particle diameter of the pigment used is out of the range of 10 to 80 nm, but the average particle diameter of the pigment in the pigment dispersion after dispersion is 80 nm or less, This is an example in which the distribution satisfies the condition of Equation 1. This pigment dispersion had insufficient storage stability.

表1で示した顔料分散液DY−6は、用いた顔料の1次粒子径は10〜80nmの範囲を外れ、分散後の顔料分散液中の顔料の平均粒子径が80nmを超え、粒度分布が式1の条件を満たしていない例である。この顔料分散液は、保存安定性が不充分であった。   In the pigment dispersion DY-6 shown in Table 1, the primary particle diameter of the pigment used was out of the range of 10 to 80 nm, the average particle diameter of the pigment in the pigment dispersion after dispersion exceeded 80 nm, and the particle size distribution Is an example that does not satisfy the condition of Equation 1. This pigment dispersion had insufficient storage stability.

表1で示した顔料分散液DG−2は、用いた顔料の1次粒子径は10〜80nmの範囲に入るが、分散後の顔料分散液中の顔料の平均粒子径が80nmを超え、粒度分布が式1の条件を満たしていない例である。この顔料分散液は、保存安定性が不充分であった。   In the pigment dispersion DG-2 shown in Table 1, the primary particle diameter of the pigment used falls within the range of 10 to 80 nm, but the average particle diameter of the pigment in the pigment dispersion after dispersion exceeds 80 nm, and the particle size This is an example in which the distribution does not satisfy the condition of Equation 1. This pigment dispersion had insufficient storage stability.

表2で示した比較例1は、顔料分散液中の顔料の平均粒子径が80nmを超え、粒度分布が式1の条件を満たしていないイエロー顔料分散液を用いた顔料分散レジスト組成物の例である。このイエロー顔料分散液は、保存安定性が不充分であった。また、この顔料分散レジスト組成物は、塗膜現像性は良好であったが、保存安定性が不充分であった。さらに、この顔料分散レジスト組成物の着色硬化塗膜の透明性、耐熱性及び耐光性は不充分であった。   Comparative Example 1 shown in Table 2 is an example of a pigment dispersion resist composition using a yellow pigment dispersion in which the average particle diameter of the pigment in the pigment dispersion exceeds 80 nm and the particle size distribution does not satisfy the condition of Formula 1. It is. This yellow pigment dispersion had insufficient storage stability. Further, this pigment-dispersed resist composition had good coating film developability but was insufficient in storage stability. Furthermore, the transparency, heat resistance and light resistance of the colored cured coating film of this pigment-dispersed resist composition were insufficient.

表2で示した比較例2は、顔料分散液中の顔料の平均粒子径が80nmを超え、粒度分布が式1の条件を満たしていないイエロー顔料分散液を用いた顔料分散レジスト組成物の例である。このイエロー顔料分散液は、保存安定性が不充分であった。また、この顔料分散レジスト組成物は、塗膜現像性及び保存安定性が不充分であった。さらに、この顔料分散レジスト組成物の着色硬化塗膜の透明性、耐熱性及び耐光性は不充分であった。   Comparative Example 2 shown in Table 2 is an example of a pigment dispersion resist composition using a yellow pigment dispersion in which the average particle diameter of the pigment in the pigment dispersion exceeds 80 nm and the particle size distribution does not satisfy the condition of Formula 1. It is. This yellow pigment dispersion had insufficient storage stability. Further, this pigment-dispersed resist composition was insufficient in coating film developability and storage stability. Furthermore, the transparency, heat resistance and light resistance of the colored cured coating film of this pigment-dispersed resist composition were insufficient.

表3で示した比較例3は、顔料分散液中の顔料の平均粒子径が80nm以下で、粒度分布が式1の条件を満たしているイエロー顔料分散液と、顔料分散液中の顔料の平均粒子径が80nmを超え、粒度分布が式1の条件を満たしていないグリーン顔料分散液とを用いた顔料分散レジスト組成物の例である。このグリーン顔料分散液は、保存安定性が不充分であった。また、この顔料分散レジスト組成物は、透明性は良好であったが、現像性及び保存安定性が不充分であった。さらに、この顔料分散レジスト組成物の着色硬化塗膜の耐熱性及び耐光性は不充分であった。   In Comparative Example 3 shown in Table 3, the average particle diameter of the pigment in the pigment dispersion is 80 nm or less, and the average particle size distribution of the yellow pigment dispersion satisfying the condition of Formula 1 and the average of the pigment in the pigment dispersion It is an example of the pigment dispersion resist composition using the green pigment dispersion liquid whose particle diameter exceeds 80 nm and whose particle size distribution does not satisfy the condition of Formula 1. This green pigment dispersion had insufficient storage stability. Further, this pigment-dispersed resist composition had good transparency but was insufficient in developability and storage stability. Furthermore, the heat resistance and light resistance of the colored cured coating film of this pigment-dispersed resist composition were insufficient.

表3で示した比較例4は、顔料分散液中の顔料の平均粒子径が80nm以下で、粒度分布が式1の条件を満たしているイエロー顔料分散液と、顔料分散液中の顔料の平均粒子径が80nmを超え、粒度分布が式1の条件を満たしていないグリーン顔料分散液とを用いた顔料分散レジスト組成物の例である。このグリーン顔料分散液は、保存安定性が不充分であった。また、この顔料分散レジスト組成物は、現像性及び保存安定性が不充分であった。さらに、この顔料分散レジスト組成物の着色硬化塗膜の透明性、耐熱性及び耐光性は不充分であった。   In Comparative Example 4 shown in Table 3, the average particle diameter of the pigment in the pigment dispersion is 80 nm or less, and the average particle size distribution of the yellow pigment dispersion satisfying the condition of Formula 1 is the average of the pigment in the pigment dispersion. It is an example of the pigment dispersion resist composition using the green pigment dispersion liquid whose particle diameter exceeds 80 nm and whose particle size distribution does not satisfy the condition of Formula 1. This green pigment dispersion had insufficient storage stability. Moreover, this pigment-dispersed resist composition was insufficient in developability and storage stability. Furthermore, the transparency, heat resistance and light resistance of the colored cured coating film of this pigment-dispersed resist composition were insufficient.

表3で示した比較例5は、顔料分散液中の顔料の平均粒子径が80nm以下で、粒度分布が式1の条件を満たしているが、分散前の顔料の1次粒子径が10〜80nmの範囲から外れるイエロー顔料分散液と、顔料分散液中の顔料の平均粒子径が80nm以下で、粒度分布が式1の条件を満たしているグリーン顔料分散液とを用いた顔料分散レジスト組成物の例である。このイエロー顔料分散液は、保存安定性が不充分であった。また、この顔料分散レジスト組成物は、現像性及び保存安定性が不充分であった。さらに、この顔料分散レジスト組成物の着色硬化塗膜の透明性、耐熱性及び耐光性は不充分であった。   In Comparative Example 5 shown in Table 3, the average particle diameter of the pigment in the pigment dispersion is 80 nm or less, and the particle size distribution satisfies the condition of Formula 1, but the primary particle diameter of the pigment before dispersion is 10 to 10 nm. A pigment-dispersed resist composition using a yellow pigment dispersion outside the range of 80 nm and a green pigment dispersion in which the average particle diameter of the pigment in the pigment dispersion is 80 nm or less and the particle size distribution satisfies the condition of Formula 1 It is an example. This yellow pigment dispersion had insufficient storage stability. Moreover, this pigment-dispersed resist composition was insufficient in developability and storage stability. Furthermore, the transparency, heat resistance and light resistance of the colored cured coating film of this pigment-dispersed resist composition were insufficient.

表3で示した比較例6は、顔料分散液中の顔料の平均粒子径が80nmを超え、粒度分布が式1の条件を満たしていないイエロー顔料分散液と、顔料分散液中の顔料の平均粒子径が80nmを超え、粒度分布が式1の条件を満たしていないグリーン顔料分散液とを用いた顔料分散レジスト組成物の例である。このイエロー顔料分散液及びグリーン顔料分散液は、保存安定性が不充分であった。また、この顔料分散レジスト組成物は、現像性及び保存安定性が不充分であった。さらに、この顔料分散レジスト組成物の着色硬化塗膜の透明性、耐熱性及び耐光性は不充分であった。



Comparative Example 6 shown in Table 3 shows that the average particle diameter of the pigment in the pigment dispersion exceeds 80 nm and the average particle size distribution of the yellow pigment dispersion that does not satisfy the condition of Formula 1 and the average of the pigment in the pigment dispersion. It is an example of the pigment dispersion resist composition using the green pigment dispersion liquid whose particle diameter exceeds 80 nm and whose particle size distribution does not satisfy the condition of Formula 1. The yellow pigment dispersion and the green pigment dispersion were insufficient in storage stability. Moreover, this pigment-dispersed resist composition was insufficient in developability and storage stability. Furthermore, the transparency, heat resistance and light resistance of the colored cured coating film of this pigment-dispersed resist composition were insufficient.



Claims (3)

1次粒子径が10〜80nmである顔料(A)を、分散剤(B)の存在下で、有機溶剤(C)中に分散させた顔料分散液であって、前記顔料分散液中の顔料の平均粒子径が80nm以下で、かつ顔料の粒度分布が下記の式1を満足することを特徴とするカラーフィルター用顔料分散液。
5(nm)≦(d84−d16)≦50(nm) ……(式1)
(式中、d84は、粒度分布の累積曲線が84質量%となる点の粒子径(nm)を表し、d16は、粒度分布の累積曲線が16質量%となる点の粒子径(nm)を表す。)
A pigment dispersion in which a pigment (A) having a primary particle size of 10 to 80 nm is dispersed in an organic solvent (C) in the presence of a dispersant (B), wherein the pigment in the pigment dispersion A pigment dispersion for a color filter, wherein the average particle size is 80 nm or less and the particle size distribution of the pigment satisfies the following formula 1.
5 (nm) ≦ (d 84 −d 16 ) ≦ 50 (nm) (Formula 1)
(Where d 84 represents the particle size (nm) at which the cumulative curve of particle size distribution is 84% by mass, and d 16 is the particle size (nm at which the cumulative curve of particle size distribution is 16% by mass). )
請求項1記載のカラーフィルター用顔料分散液を含有することを特徴とするカラーフィルター用顔料分散レジスト組成物。 A pigment dispersion resist composition for a color filter, comprising the pigment dispersion for a color filter according to claim 1. 透明基板上に着色画素部を有し、該着色画素部が請求項2記載のカラーフィルター用顔料分散レジスト組成物の硬化塗膜からなることを特徴とするカラーフィルター。

A color filter comprising a colored pixel portion on a transparent substrate, and the colored pixel portion comprising a cured coating film of the pigment-dispersed resist composition for a color filter according to claim 2.

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