Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making
Reexamination Certificate
2001-03-01
2002-04-23
McPherson, John A. (Department: 1756)
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
Reexamination Certificate
active
06376153
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a novel photopolymerizable composition for a color filter and a process for producing the color filter. More particularly, it relates to a photopolymerizable composition which is suitable for manufacturing a spectral filter of each color such as blue, green and red, and a black matrix for a plasma display, a liquid crystal display, etc. and which has excellent heat resistance, high electrical insulation resistance and high storage stability, and a process for producing a color filter with the use of the composition.
BACKGROUND OF THE INVENTION
In manufacturing a display device such as a plasma display and a liquid crystal display, it has been a practice to use spectral filters of various colors such as blue, green and red for spectrally classifying back light, etc. or to provide a black filter as a black matrix to enhance the contrast. To produce these color filters, use is made of photopolymerizable compositions for color filters containing various organic color pigments such as phthalocyanine pigments and azo pigments or light-screening pigments such as carbon black. Color filters are produced by applying the above-mentioned photopolymerizable compositions for color filters, which each has been preferably dissolved in a solvent, on substrates, and drying the same followed by pattern-making by photolithography.
In recent years, it has been desired to use plasma display devices (hereinafter referred to simply as “PDP”) in practice. This is because PDPs are usable as displays having an emission luminance comparable to that of CRT displays and a relatively simple structure, which makes it possible to provide large-scaled PDPs and compact apparatuses. It is expected that PDPs provided with color filters of blue, green and red or a black matrix can show an enhanced contrast similar to that of CRT displays. However, the process for manufacturing PDPs includes the step of baking at a temperature of 350 to 750° C. at which the conventional photopolymerizable compositions containing organic pigments or carbon black as the major components would undergo decomposition or volatilization of the pigments or carbon black. Thus, it is difficult to form any satisfactory color filters. To solve this problem, attempts have been made to add inorganic pigments to photopolymerizable compositions for color filters so as to impart heat resistance thereto. In these cases, however, there arises another problem that the photopolymerizable compositions containing inorganic pigments would gel within a short period of time, thus showing poor storage stability.
SUMMARY OF THE INVENTION
Under these circumstances, the present inventors have conducted extensive studies. As a result, they have found out that the rapid gelation of the above-mentioned photopolymerizable composition for a color filter is caused by the presence of halogen atoms and a photopolymerizable composition for a color filter which is substantially free from any halogen atom can achieve good heat resistance, high electrical insulation resistance and high storage stability, thus completing the present invention.
Accordingly, an object of the present invention is to provide a photopolymerizable composition for a color filter which has good heat resistance, high electrical insulation resistance and high storage stability.
Another object of the present invention is to provide a process for producing a color filter by using the photopolymerizable composition for a color filter.
DETAILED DESCRIPTION OF THE INVENTION
To achieve the above-mentioned objects, the present invention relates to a photopolymerizable composition for a color filter containing an addition-polymerizable compound having at least one ethylenically unsaturated double bond, a photopolymerization initiator and metal oxide(s) as a coloring material and being substantially free from any halogen atom and a process for producing a color filter with the use of the same.
The term “an addition-polymerizable compound having at least one ethylenically unsaturated double bond” (hereinafter referred to simply as an “ethylenic compound”) as used herein means a compound having at least one ethylenically unsaturated double bond to cause addition-polymerization and curing under the action of the photopolymerization initiator, when the photopolymerizable composition is irradiated with energy radiation. Namely, it means a monomer having the above-mentioned ethylenically unsaturated double bond or a polymer having the ethylenically unsaturated double bond in the side chain or the main chain thereof. The term “monomer” as used herein means those to be distinguished from “polymer” and includes not only “monomers” in a narrow sense but also dimers, trimers and oligomers. Examples of the monomer include unsaturated carboxylic acids; esters of aliphatic (poly)hydroxy compounds with unsaturated carboxylic acids; esters of aromatic (poly)hydroxy compounds with unsaturated carboxylic acids; esters obtained by esterification reaction of an unsaturated carboxylic acid, a polyvalent carboxylic acid and a polyvalent hydroxy compound such as the above-mentioned aliphatic (poly)hydroxy compounds and aromatic (poly)hydroxy compounds; unsaturated carboxylic acid amides; and unsaturated carboxylic acid nitriles. More particularly, useful examples thereof include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, isobutyl acrylate, isobutyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, ethylene glycol monomethyl ether acrylate, ethylene glycol monomethyl ether methacrylate, ethylene glycol monoethyl ether acrylate, ethylene glycol monoethyl ether methacrylate, glycerol acrylate, glycerol methacrylate, acrylamide, methacrylamide, acrylonitrile, methacrylonitrile, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, benzyl acrylate, benzyl methacrylate, ethylene glycol diacrylate, ethylene glycol dimethacrylate, triethylene glycol diacrylate, triethylene glycol dimethacrylate, tetraethylene glycol diacrylate, tetraethylene glycol dimethacrylate, butylene glycol dimethacrylate, propylene glycol diacrylate, propylene glycol dimethacrylate, trimethylolethane triacrylate, trimethylolethane trimethacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, tetramethylolpropane tetracrylate, tetramethylolpropane tetramethacrylate, pentaerythritol triacrylate, pentaerythritol trimethacrylate, pentaerythritol tetracrylate, pentaerythritol tetramethacrylate, dipentaerythritol pentacrylate, dipentaerythritol pentamethacrylate, dipentaerythritol hexacrylate, dipentaerythritol hexamethacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, cardoepoxy diacrylate, cardoepoxy dimethacrylate, the compounds in which the acrylate or methacrylate in the above-exemplified compounds is replaced with fumarate, maleate, crotonate or itaconate, acrylic acid, methacrylic acid, fumaric acid, maleic acid, crotonic acid, itaconic acid, hydroquinone monoacrylate, hydroquinone monomethacrylate, hydroquinone diacrylate, hydroquinone dimethacrylate, resorcin diacrylate, resorcin dimethacrylate, pyrogallol diacrylate, pyrogallol triacrylate, condensation products of diethylene glycol with acrylic acid or maleic acid, condensation products of diethylene glycol with phthalic acid, condensation products of pentaerythritol with methacrylic acid or terephthalic acid, condensation products of butanediol or glycerol with acrylic acid or adipic acid, ethylenebisacrylamide, ethylenebismethacrylamide, allyl esters such as diallyl phthalate, and divinyl phthalate.
Examples of the polymers having the ethylenically unsaturated double bond in the side chain or main chain thereof include polyesters obtained by the polycondensation between unsaturated divalent carboxylic acids with dihydroxy compounds; polyamides obtained by the polycondensation between unsaturated divalent carboxylic acids with a diamine; polyesters obtained by the polycondensation between itaconic acid, propylidenesuccinic acid or ethylidenemalonic acid with a dihydroxy
Komano Hiroshi
Shida Masaru
Uchikawa Kiyoshi
McPherson John A.
Tokyo Ohka Kogyo Co. Ltd.
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