JP5429483B2 - Photosensitive composition, optical member, photoelectric conversion element, and method for producing photoelectric conversion element - Google Patents

Description

  The present invention relates to a photosensitive composition, an optical member, a photoelectric conversion element, and a method for producing a photoelectric conversion element.

  In fields such as sealing materials such as light-emitting elements, optical members such as optical waveguides and lenses of optical elements, and optical functional films such as antireflection films, it has a high refractive index and facilitates precise molding. There is a need for materials that can be used.

  For example, conventionally, a sealing material having a purpose of protecting a light emitting element such as a light emitting diode and a purpose of changing the color of light emitted from the light emitting element is generally formed of an epoxy resin ( (See Patent Document 1 and Patent Document 2). It is known that an epoxy resin has a higher refractive index than other resins, and for example, the light extraction efficiency from a light emitting element is improved.

  However, the epoxy resin may be yellowed by light emitted from the light emitting element, or may be thermally deteriorated due to heat generation of the light emitting element, so that the chemical stability is insufficient. In recent optical members, a higher refractive index is required, and it is difficult to meet the demand with an epoxy resin alone.

  Silicone resin has been studied as a material to replace epoxy resin. For example, Patent Document 3 and Patent Document 4 disclose a silicone resin composition containing a silicone resin having an alkenyl group bonded to a silicon atom and an organohydrogenpolysiloxane having a Si—H bond. Silicone resins are less susceptible to yellowing due to light and have heat resistance, but the refractive index is not necessarily high yet.

  On the other hand, as one of the methods for increasing the refractive index of an optical member, in an optical functional film such as an antireflection film, it has been studied to add a material having a high refractive index to the resin constituting the film. Examples of such a high refractive index substance include fine particles of metal oxides such as titanium oxide and zirconium oxide. For example, Patent Document 5 discloses a high refractive index layer made of a cured product of metal oxide fine particles and a silicone compound. Patent Document 6 discloses a high refractive index layer using a binder composed of inorganic fine particles, vinyl group-containing polysiloxane, and a thermosetting resin.

  The composition used for the optical functional film is considered to have improved chemical stability because it contains a silicone-based resin, but the refractive index is still at most 1.6 even if metal fine particles are added. It cannot be said that it is high enough. In addition, heating and a catalyst are required in the polymerization, and further, a precise mold is required at the time of polymerization, and it is necessary to process into a desired shape after the polymerization. In the molding of optical members in recent years, there is a demand for easy molding that can be patterned, for example, like a resist.

JP 2000-281868 A JP 2004-339319 A JP 2004-186168 A JP 2004-221308 A JP 2004-117704 A JP 2003-240906 A

  As one method for improving the moldability of the optical member, it is conceivable to use a photocurable resin. An optical member having a high refractive index and excellent chemical stability and moldability is obtained by selecting a resin having a high chemical stability as such a resin and blending as many fine particles having a high refractive index as possible. Is considered to be obtained.

  However, when a large amount of fine particles are blended with the photocurable resin, it may be difficult to cure the photocurable resin. For example, when a large amount of particles of titanium dioxide as fine particles having a high refractive index are blended in an ultraviolet curable resin, the particles have absorption in the ultraviolet region, so that the resin is not sufficiently cured by ultraviolet rays and is going to be molded. The optical member may be deformed or dropped from the substrate.

  One of the objects according to some embodiments of the present invention is to provide a photoelectric conversion element having an optical member that is easy to mold and has a high refractive index and chemical stability after curing, and a method for manufacturing the photoelectric conversion element. is there. Another object of some embodiments of the present invention is to provide a photosensitive composition that is easy to mold and has a high refractive index and chemical stability after curing.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following aspects or application examples.

[Application Example 1]
One aspect of the photoelectric conversion element according to the present invention is:
On the light emitting / receiving element,
Inorganic particles having a refractive index of 2.0 or more at a wavelength of 589 nm mainly composed of a metal oxide;
A polymerizable compound having a plurality of (meth) acryloyl groups in the molecule;
An alkali-soluble polymer having at least one of a hydroxyl group and a carboxyl group in the molecule;
A photo-radical polymerization initiator having an oxime ester structure;
And a cured film of the photosensitive composition.

  The photoelectric conversion element of this application example has a cured film (optical member) that is easily alkali-developed and has a high refractive index and chemical stability after curing. Therefore, the photoelectric conversion element of this application example has a high refractive index and is excellent in chemical stability and moldability.

[Application Example 2]
One aspect of the method for producing a photoelectric conversion element according to the present invention is:
On the light emitting / receiving element,
Inorganic particles having a refractive index of 2.0 or more at a wavelength of 589 nm mainly composed of a metal oxide;
A polymerizable compound having a plurality of (meth) acryloyl groups in the molecule;
An alkali-soluble polymer having at least one of a hydroxyl group and a carboxyl group in the molecule;
A photo-radical polymerization initiator having an oxime ester structure;
The photosensitive composition containing is applied, and exposure processing and development processing with an alkali developer are performed.

  In the manufacturing method of the photoelectric conversion element of this application example, a cured film (optical member) having a high refractive index and chemical stability after curing is performed by exposure and development with an alkaline developer. Therefore, according to the method for producing a photoelectric conversion element of this application example, a photoelectric conversion element having a cured film having a high refractive index and good chemical stability can be easily produced.

[Application Example 3]
One aspect of the photosensitive composition according to the present invention is:
A negative photosensitive composition developed with an alkaline developer,
Inorganic particles having a refractive index of 2.0 or more at a wavelength of 589 nm mainly composed of a metal oxide;
A polymerizable compound having a plurality of (meth) acryloyl groups in the molecule;
An alkali-soluble polymer having at least one of a hydroxyl group and a carboxyl group in the molecule;
A photo-radical polymerization initiator having an oxime ester structure;
An organic solvent,
including.

  The photosensitive composition of this application example contains a polymerizable compound, a radical photopolymerization initiator having an oxime ester structure, and an alkali-soluble polymer and inorganic particles. Since the photosensitive composition of this application example contains at least an alkali-soluble polymer, the alkali developability is good, the patterning by light is easy, and the moldability is excellent. Moreover, since it contains the radical photopolymerization initiator which has an oxime ester structure, even if it contains inorganic particle | grains, it can fully harden | cure by being irradiated with light. Furthermore, since it contains inorganic particles containing a metal oxide as a main component, a cured product having a high refractive index after curing can be obtained. And since the hardened | cured body after hardening has the structure which the polymeric compound which has a some (meth) acryloyl group in a molecule | numerator bridge | crosslinked, it is chemically stable and it is hard to raise | generate a deformation | transformation, a quality change, etc.

[Application Example 4]
In application example 3,
The inorganic particles can be mainly composed of an oxide of at least one metal selected from titanium, zirconium, hafnium, niobium, tantalum, tungsten, cerium, indium and tin.

  In addition to the characteristics of the photosensitive composition of Application Example 3, the photosensitive composition of this application example has a high refractive index and transparency in the cured product after curing.

[Application Example 5]
In application example 4,
The inorganic particles include titanium dioxide having an anatase type crystal structure, and the number average particle diameter may be 1 nm or more and 100 nm or less.

  In addition to the characteristics of the photosensitive composition of Application Example 4, the photosensitive composition of this application example has a high refractive index and transparency in the cured product after curing.

[Application Example 6]
In any one of Application Examples 3 to 5,
The compounding amount of the inorganic particles may be 50% by mass or more and 90% by mass or less with respect to all components excluding the organic solvent.

  In addition to the characteristics of the photosensitive composition of the above application example, the photosensitive composition of this application example has a high refractive index in the cured product after curing.

[Application Example 7]
In any one of Application Example 3 to Application Example 6,
The alkali-soluble polymer may have a weight average molecular weight of 1000 or more and 50000 or less.

  In addition to the characteristics of the photosensitive composition of the above application example, the photosensitive composition of this application example has good alkali developability in patterning.

[Application Example 8]
In any one of Application Example 3 to Application Example 7,
A surfactant may further be included.

  In addition to the characteristics of the photosensitive composition of the above application example, the photosensitive composition of this application example further easily forms a photosensitive film for patterning.

[Application Example 9]
In any one of Application Example 3 to Application Example 8,
A polymerization inhibitor may be further included.

  In addition to the characteristics of the photosensitive composition of the above application example, the photosensitive composition of this application example has high shape accuracy during patterning.

[Application Example 10]
One aspect of the optical member according to the present invention is:
A coating film is formed using the photosensitive composition described in any one of Application Examples 3 to 9, and the coating film is formed by exposure treatment and alkali development treatment.

  Since the optical member of this application example is formed using the photosensitive composition of the above application example, it has a high refractive index, is chemically stable, and hardly undergoes deformation or alteration.

  The photosensitive composition according to the present invention has good alkali developability, is easily patterned by light, and has excellent moldability. Moreover, the photosensitive composition concerning this invention can fully harden | cure by irradiation of light. Furthermore, the photosensitive composition concerning this invention can become a hardening body which has a high refractive index after hardening. Moreover, the optical member which hardened | cured the photosensitive composition concerning this invention is chemically stable, and does not raise | generate a deformation | transformation, a quality change, etc. easily. Such an optical member can be applied to a photoelectric conversion element, and the photoelectric conversion element according to the present invention has a high refractive index and excellent chemical stability and moldability.

The result of having observed the patterned hardening body of Example 1 with an optical microscope. The result of having observed the hardened | cured material patterned of the comparative example 1 with the optical microscope. The result of having observed the patterned hardening object of comparative example 2 with an optical microscope.

  Hereinafter, preferred embodiments of the present invention will be described. Embodiment described below demonstrates an example of this invention. In addition, the present invention is not limited to the following embodiments, and includes various modifications that are implemented within a range that does not change the gist of the present invention.

  The photosensitive composition according to this embodiment is a negative photosensitive composition that is developed with an alkali developer, and has inorganic particles, a polymerizable compound, an alkali-soluble polymer, and a light having an oxime ester structure. A radical polymerization initiator and an organic solvent.

1. Inorganic particles The photosensitive composition of this embodiment contains the inorganic particle which has a metal oxide as a main component. One of the functions of the inorganic particles is to increase the refractive index of the cured photosensitive composition (hereinafter sometimes referred to as a cured product) when the photosensitive composition is cured. It is done.

  As a metal oxide which becomes a main component of the inorganic particles of the present embodiment, a metal oxide having a refractive index of 2 or more, for example, titanium oxide (refractive index 2.2 to 2.7), zirconium oxide (refractive index 2). 0.1), hafnium oxide (refractive index 2.0), niobium oxide (refractive index 2.1 to 2.3), tantalum oxide (refractive index 2.0 to 2.3), tungsten oxide (refractive index 2.2) ), Cerium oxide (refractive index 2.2), indium oxide (refractive index 2.0), and tin oxide (refractive index 2.0). These metal oxides may be used in combination of two or more.

  The metal oxide that is the main component of the inorganic particles of the present embodiment is preferably a metal oxide having a high refractive index, and among those exemplified above as those that are relatively easy to be microparticulated (manufactured). Group element oxides are preferred, ie titanium oxide, zirconium oxide, and hafnium oxide. Further, among these, as the metal oxide that is the main component of the inorganic particles of the present embodiment, particularly preferably, titanium oxide is used because it has a high refractive index and is easily available due to many types of commercial products. Can be mentioned.

  When the inorganic particles are formed with titanium oxide as a main component, it is more preferable to include titanium dioxide having an anatase type crystal structure. Since such inorganic particles can have a high refractive index and better dispersibility in the photosensitive composition, for example, the content of the inorganic particles in the photosensitive composition can be reduced, and For example, the refractive index of the cured body can be increased efficiently.

Note that the valence of the metal element of the metal oxide may be a stoichiometric valence or may deviate from the stoichiometric valence. For example, in this specification, the expression titanium oxide not only refers to titanium dioxide (TiO ₂ ) but also includes TiO x (x is a value in the vicinity of 2). In this specification, the expression titanium oxide includes hydrates of titanium oxide.

  Moreover, in this specification, a refractive index shall mean the refractive index measured at wavelength 633nm and 23 degreeC. In the present specification, “high refractive index” refers to a refractive index of 1.8 or more.

  The inorganic particles of the present embodiment may be surface-modified, for example, within a range in which the metal oxide is a main component. Examples of the surface modification include coating with silicon oxide and coating with various organic compounds. Such surface modification can be performed, for example, for the purpose of improving dispersibility of inorganic particles in the photosensitive composition.

  The size of the inorganic particles of the present embodiment is preferably 1 nm or more and 100 nm or less as the number average particle diameter. When the number average particle diameter of the inorganic particles is 100 nm or less, the refractive index of the cured product of the photosensitive composition can be increased and the transparency can be increased. In addition, when the number average particle diameter of the inorganic particles is less than 1 nm, a quantum effect may be manifested, which may affect the characteristics when the cured body is formed. Further, the more preferable size of the inorganic particles is in the range of 5 nm to 50 nm in the number average particle diameter.

  The number average particle diameter of the inorganic particles can be measured, for example, from a particle size frequency distribution by a particle size distribution meter. For example, in the method using a particle size distribution meter, the particle size frequency distribution can be obtained by measuring a solution in which inorganic particles are dispersed using a laser diffraction method or a scattering method. “The number average particle size is 1 nm or more and 100 nm or less” is a range in which the central particle size (volume-based median diameter: d50) with a cumulative frequency of 50% is 1 nm or more and 100 nm or less in the particle size frequency distribution. Means that

  Moreover, the number average particle diameter of the inorganic particles can also be obtained by observation using an electron microscope. In this method, inorganic particles are photographed with a transmission electron microscope or a scanning electron microscope, and the particle size of the photographed particles is measured. Then, a simple average (number average) of the particle diameters, that is, a value of [total particle diameter measured] / [number of measured particles] is defined as a number average particle diameter. At this time, it is preferable to obtain an average particle diameter by measuring about 200 or more inorganic particles.

  The shape of the inorganic particles is not particularly limited, and may be, for example, a spherical shape, a spheroid shape, a hollow shape, a porous shape, a rod shape, a plate shape, a fiber shape, or an indefinite shape, and is preferably a spherical shape. In any of these shapes, the number average particle diameter can be measured by the method described above.

  As the inorganic particles, for example, titanium oxide particles (for example, available as trade name “Nanotek” from C.I. Kasei Co., Ltd.) are pulverized or dispersed by a device such as a ball mill to produce a powder or a dispersion. it can. In addition, the inorganic particles can be procured as a dispersion. Examples of commercially available particles that can be used as inorganic particles include, for example, silicon oxide-coated anatase-type titanium oxide-methanol dispersion sol (manufactured by Catalyst Kasei Kogyo Co., Ltd., Optolake Series), silicon oxide-coated tin oxide-containing rutile Type titanium oxide-methanol dispersion sol (manufactured by Teika Co., Ltd., TS series), zirconium oxide-methyl ethyl ketone dispersion sol (manufactured by Sumitomo Osaka Cement Co., Ltd., HXU-120JC), nSol-101-20PM (manufactured by NanoGram, USA) It is done.

  The content of inorganic particles in the photosensitive composition of the present embodiment is preferably 50% by mass or more and 90% by mass or less with respect to the photosensitive composition. Moreover, it is preferable that they are 50 mass% or more and 90 mass% or less with respect to the whole quantity of the component except an organic solvent. When the content of the inorganic particles is out of the above range, the photosensitive composition may be insufficiently cured by light, or the refractive index of the cured body may be insufficient.

  The photosensitive composition of this embodiment contains the above-mentioned inorganic particles. Therefore, a cured product obtained by curing the photosensitive composition has a high refractive index and can have good transparency. Here, the transparency of the cured product refers to the property of transmitting electromagnetic waves such as infrared rays, near infrared rays, visible rays, and ultraviolet rays, and is evaluated by visual observation, and quantitatively measured by a spectrophotometer or the like. Can be done.

2. Polymerizable compound The photosensitive composition of this embodiment contains the polymeric compound which has several (meth) acryloyl group in a molecule | numerator. One of the functions of the polymerizable compound is to polymerize to form a high molecular weight or to form a crosslinked structure when the photosensitive composition is irradiated with light. Thereby, the whole photosensitive composition can be hardened. The “(meth) acryloyl group” means an acryloyl group or a methacryloyl group, and “having a plurality of (meth) acryloyl groups in the molecule” means an acryloyl group and a meta group present in the molecule. It means that the total of acryloyl groups is 2 or more (either acryloyl group or methacryloyl group may not be present).

  Examples of the polymerizable compound having a plurality of (meth) acryloyl groups in the molecule include the following.

  Examples of the polymerizable compound having two (meth) acryloyl groups in the molecule include 1,3-butanediol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di ( (Meth) acrylate, 1,10-decanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 2,4-dimethyl-1,5-pentanediol di (meth) acrylate, butylethylpropanediol (meth) Acrylate, ethoxylated cyclohexanemethanol di (meth) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, oligoethylene Recall di (meth) acrylate, dipropylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, 2-ethyl-2-butyl-butanediol di (meth) acrylate, full orange (meth) acrylate, hydroxypivalic acid Neopentyl glycol di (meth) acrylate, EO-modified bisphenol A di (meth) acrylate, bisphenol F polyethoxydi (meth) acrylate, oligopropylene glycol di (meth) acrylate, 2-ethyl-2-butyl-propanediol di (meth) Acrylate, 1,9-nonanediol di (meth) acrylate, propoxylated ethoxylated bisphenol A di (meth) acrylate, tricyclodecane di (meth) acrylate, bis (2-hydride) Kishiechiru) isocyanurate di (meth) acrylate.

  Examples of polymerizable compounds having three (meth) acryloyl groups in the molecule include trimethylolpropane tri (meth) acrylate, trimethylolethane tri (meth) acrylate, trimethylolpropane alkylene oxide-modified tri (meth) acrylate, penta Erythritol tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, trimethylolpropane tri ((meth) acryloyloxypropyl) ether, glycerin tri (meth) acrylate, tris (2-hydroxyethyl) isocyanurate tri ( (Meth) acrylate, isocyanuric acid alkylene oxide modified tri (meth) acrylate, propionate dipentaerythritol tri (meth) acrylate, tri ((meth) acryloyloxy Chill) isocyanurate, hydroxypivalaldehyde-modified dimethylol propane tri (meth) acrylate, sorbitol tri (meth) acrylate, propoxylated trimethylolpropane tri (meth) acrylate, and ethoxylated glycerin triacrylate.

  Polymerizable compounds having four (meth) acryloyl groups in the molecule include pentaerythritol tetra (meth) acrylate, sorbitol tetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, and dipentaerythritol tetrapropionate (meth). ) Acrylate, ethoxylated pentaerythritol tetra (meth) acrylate, and the like.

  Examples of the polymerizable compound having five (meth) acryloyl groups in the molecule include sorbitol penta (meth) acrylate and dipentaerythritol penta (meth) acrylate.

  Examples of polymerizable compounds having six (meth) acryloyl groups in the molecule include dipentaerythritol hexa (meth) acrylate, sorbitol hexa (meth) acrylate, phosphazene alkylene oxide-modified hexa (meth) acrylate, and caprolactone-modified dipentaerythritol. Examples include hexa (meth) acrylate.

  The polymerizable compound of the present embodiment may further be a compound having 7 or more (meth) acryloyl groups. In addition, the polymerizable compound of the present embodiment may be (meth) acrylates having a hydroxyl group, and poly (meth) acrylates of ethylene oxide or propylene oxide adducts to these hydroxyl groups among the polymerizable compounds. Good. Furthermore, as a polymerizable compound of this embodiment, as long as it is a compound having two or more (meth) acryloyl groups, oligoester (meth) acrylates, oligoether (meth) acrylates, and oligoepoxy (meth) Acrylates and the like can be used.

  Among these, as the polymerizable compound of the present embodiment, pentaerythritol tri (meth) acrylate, full orange (meth) acrylate, oligoester (meth) acrylate (dendrimer (meth) acrylate) is excellent in polymerizability. And more preferable.

  As a commercial item of the polymeric compound illustrated above, Toagosei Co., Ltd. Aronix M-400, M-404, M-408, M-450, M-305, M-309, M-310, M- 315, M-320, M-350, M-360, M-208, M-210, M-215, M-220, M-225, M-233, M-240, M-245, M-260, M-270, M-1100, M-1200, M-1210, M-1310, M-1600, M-221, M-203, TO-924, TO-1270, TO-1231, TO-595, TO- 756, TO-1343, TO-902, TO-904, TO-905, TO-1330, KAYARAD D-310, D-330, DPHA, DPCA-20, DPCA manufactured by Nippon Kayaku Co., Ltd. 30, DPCA-60, DPCA-120, DN-0075, DN-2475, SR-295, SR-355, SR-399E, SR-494, SR-9041, SR-368, SR-415, SR-444, SR-454, SR-492, SR-499, SR-502, SR-9020, SR-9035, SR-111, SR-212, SR-213, SR-230, SR-259, SR-268, SR- 272, SR-344, SR-349, SR-601, SR-602, SR-610, SR-9003, PET-30, T-1420, GPO-303, TC-120S, HDDA, NPGDA, TPGDA, PEG400DA, MANDA, HX-220, HX-620, R-551, R-712, R-167, R-526, R-5 51, R-712, R-604, R-684, TMPTA, THE-330, TPA-320, TPA-330, KS-HDDA, KS-TPGDA, KS-TMPTA, Kyoeisha Chemical Co., Ltd. light acrylate PE-4A , DPE-6A, DTMP-4A, Osaka Organic Chemical Co., Ltd. biscoat # 802; a mixture of tripentaerythritol octaacrylate and tripentaerythritol heptaacrylate, and the like.

  As for the compounding quantity of the polymeric compound in the photosensitive composition of this embodiment, 1 to 20 mass% is preferable with respect to the whole photosensitive composition. Moreover, the compounding quantity of the polymeric compound in the photosensitive composition of this embodiment exists in the range of 5 mass% or more and 50 mass% or less with respect to the sum total of the component except an organic solvent, and 10 mass% or more and 40 mass%. More preferably within the following range. By blending the polymerizable compound in the above range, a cured film or cured body having high hardness can be obtained.

3. Alkali-soluble polymer The photosensitive composition of this embodiment contains the alkali-soluble polymer which has at least one of a hydroxyl group and a carboxyl group in a molecule | numerator. One of the functions of the alkali-soluble polymer is to impart alkali developability to the photosensitive composition. Thereby, the site | part which is not exposed of the photosensitive composition can be removed with an alkali developing solution. That is, negative patterning property can be imparted to the photosensitive composition by the function of the alkali-soluble polymer. That is, the alkali-soluble polymer has a function of allowing an unexposed portion of the photosensitive composition to be removed with an alkali developer after the photosensitive composition is exposed.

  The alkali-soluble polymer is not particularly limited as long as it is soluble in an alkali developer, but is usually a polymer having an acidic functional group such as a carboxyl group or a phenolic hydroxyl group. Among them, a polymer having a carboxyl group is preferable, and in particular, an ethylenically unsaturated monomer having one or more carboxyl groups (hereinafter referred to as “carboxyl group-containing unsaturated monomer”) and other copolymers. A copolymer with a possible ethylenically unsaturated monomer (hereinafter referred to as “copolymerizable unsaturated monomer”) (hereinafter referred to as “carboxyl group-containing copolymer”) is preferred.

  Examples of the carboxyl group-containing unsaturated monomer include unsaturated monocarboxylic acids such as (meth) acrylic acid, crotonic acid, α-chloroacrylic acid, cinnamic acid; maleic acid, maleic anhydride, fumaric acid, itacone Acid, itaconic anhydride, citraconic acid, citraconic anhydride, mesaconic acid and other unsaturated dicarboxylic acids or anhydrides thereof; succinic acid mono [2- (meth) acryloyloxyethyl], phthalic acid mono [2- (meth) A mono [(meth) acryloyloxyalkyl] ester of a polyvalent carboxylic acid having two or more valences such as acryloyloxyethyl]; a carboxy group and a hydroxyl group at both ends of ω-carboxypolycaprolactone mono (meth) acrylate, etc. Examples thereof include mono (meth) acrylates of polymers having the same.

  The said carboxyl group-containing unsaturated monomer can be used individually or in mixture of 2 or more types.

  In the present embodiment, as the carboxyl group-containing unsaturated monomer, (meth) acrylic acid, succinic acid mono [2- (meth) acryloyloxyethyl], ω-carboxypolycaprolactone mono (meth) acrylate and the like are preferable. In particular, (meth) acrylic acid is preferred.

  In the carboxyl group-containing copolymer, the copolymerization ratio of the carboxyl group-containing unsaturated monomer is preferably 5 to 50% by weight, more preferably 10 to 40% by weight. In this case, if the copolymerization ratio is less than 5% by weight, the solubility of the resulting photosensitive composition in an alkaline developer tends to decrease, whereas if it exceeds 50% by weight, the solubility in an alkaline developer is excessive. Thus, when developing with an alkali developer, the pixel tends to drop off from the substrate or the pixel surface becomes rough.

  Examples of the copolymerizable unsaturated monomer include maleimide; N-phenylmaleimide, N-o-hydroxyphenylmaleimide, Nm-hydroxyphenylmaleimide, Np-hydroxyphenylmaleimide, and N-benzylmaleimide. N-substituted maleimides such as N-cyclohexylmaleimide; styrene, α-methylstyrene, o-vinyltoluene, m-vinyltoluene, p-vinyltoluene, p-chlorostyrene, o-methoxystyrene, m-methoxystyrene, p-methoxystyrene, o-vinylphenol, m-vinylphenol, p-vinylphenol, p-hydroxy-α-methylstyrene, o-vinylbenzyl methyl ether, m-vinylbenzyl methyl ether, p-vinylbenzyl methyl ether, o-vinyl benz Aromatic vinyl compounds such as luglycidyl ether, m-vinylbenzyl glycidyl ether, p-vinylbenzyl glycidyl ether; indenes such as indene and 1-methylindene; methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (Meth) acrylate, i-propyl (meth) acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, sec-butyl (meth) acrylate, t-butyl (meth) acrylate, 2-ethylhexyl (meta ) Unsaturated carboxylic acid esters such as acrylate and 2-hydroxyethyl (meth) acrylate; Unsaturated carboxylic acid glycidyl esters such as glycidyl (meth) acrylate; Calories such as vinyl acetate, vinyl propionate, vinyl butyrate and vinyl benzoate Acid vinyl ester; other unsaturated ethers such as vinyl methyl ether, vinyl ethyl ether, allyl glycidyl ether; vinyl cyanide compounds such as (meth) acrylonitrile, α-chloroacrylonitrile, vinylidene cyanide; (meth) acrylamide, α -Unsaturated amides such as chloroacrylamide and N-2-hydroxyethyl (meth) acrylamide; aliphatic conjugated dienes such as 1,3-butadiene, isoprene and chloroprene; polystyrene, polymethyl (meth) acrylate, poly-n-butyl ( Examples thereof include a macromonomer having a mono (meth) acryloyl group at the end of a polymer molecular chain such as (meth) acrylate and polysiloxane.

  These copolymerizable unsaturated monomers can be used alone or in admixture of two or more.

  In the present embodiment, the copolymerizable unsaturated monomer includes N-substituted maleimide, aromatic vinyl compound, unsaturated carboxylic acid ester, and macromonomer having a mono (meth) acryloyl group at the end of the polymer molecular chain. In particular, N-phenylmaleimide, N-cyclohexylmaleimide, styrene, α-methylstyrene, p-hydroxy-α-methylstyrene, methyl (meth) acrylate, n-butyl (meth) acrylate, 2-ethylhexyl (meta ) Acrylate, 2-hydroxyethyl (meth) acrylate, allyl (meth) acrylate, benzyl (meth) acrylate, glycerol mono (meth) acrylate, 4-hydroxyphenyl (meth) acrylate, ethylene oxide modification of paracumylphenol (meth) Accel Relay , Polystyrene macromonomer, polymethyl methacrylate macromonomer and the like are preferable.

  Moreover, for example, an unsaturated isocyanate such as 2- (meth) acryloyloxyethyl isocyanate is added to an alkali-soluble resin obtained by copolymerizing a copolymerizable unsaturated monomer having a hydroxyl group such as 2-hydroxyethyl (meth) acrylate. By reacting the compound, a polymerizable unsaturated bond can be introduced into the side chain of the alkali-soluble resin, and such an alkali-soluble polymer can also be suitably used for the photosensitive composition of the present embodiment. .

  The polystyrene-converted weight average molecular weight (hereinafter sometimes referred to as “Mw”) measured by gel permeation chromatography (GPC, elution solvent: tetrahydrofuran) of the alkali-soluble polymer in the present embodiment is preferably 1000 or more and 50000 or less. Especially preferably, it is 3000 or more and 30000 or less.

  The polystyrene-equivalent number average molecular weight (hereinafter referred to as “Mn”) measured by GPC (elution solvent: tetrahydrofuran) of the alkali-soluble polymer in this embodiment is preferably 1000 or more and 50000 or less, and preferably 3000 or more and 30000 or less. is there.

  Moreover, the ratio (Mw / Mn) of Mw and Mn of the alkali-soluble polymer in the present embodiment is preferably 1 or more and 5 or less, more preferably 1 or more and 4 or less. In this case, if the Mw is less than 1000, the alkali developability of the photosensitive composition decreases, the reproducibility of the pattern shape imparted by patterning decreases, or the cured photosensitive composition has heat resistance and the like. On the other hand, if it exceeds 50000, the resolution of the pattern shape imparted by patterning may be reduced, the shape may be impaired, and the fluidity of the photosensitive composition may be impaired. . Moreover, when Mw exceeds 50000, when a photosensitive composition is apply | coated to the target object by a slit nozzle system etc., there exists a possibility that the foreign material etc. which the component dried may generate | occur | produce easily.

  The alkali-soluble polymer in the present embodiment is obtained by, for example, using an unsaturated monomer as a constituent component of 2,2′-azobisisobutyronitrile, 2,2′-azobis (2) in an appropriate solvent. , 4-dimethylvaleronitrile), 2,2′-azobis (4-methoxy-2,4-dimethylvaleronitrile) and the like in the presence of a radical polymerization initiator.

  In addition, the alkali-soluble polymer in the present invention, each unsaturated monomer as a constituent component, in the presence of the radical polymerization initiator in an inert solvent, the reaction temperature is usually 0 to 150 ° C., Preferably, it can be produced by polymerization at 50 to 120 ° C.

  The alkali-soluble polymer can also be obtained, for example, from Toa Synthetic Chemical Co., Ltd. as “ARUFON-UP1000 series, UH2000 series, UC3000 series (trade name)”. The alkali-soluble polymer is available, for example, as “ORGA series, AGOR series (trade name)” from Osaka Organic Chemical Industry Co., Ltd., for example, the ORGA series includes the following general formula (1), AGOR series. Has the structure of the following general formula (2).

  In the above general formulas (1) and (2), R represents an alkyl group, and l, m, and n represent natural numbers.

  The alkali-soluble polymer also has a function as a leveling agent. For example, when a coating film is formed from the photosensitive composition, the alkali-soluble polymer can also contribute to planarization of the surface of the coating film.

  In this embodiment, an alkali-soluble polymer can be used individually or in mixture of 2 or more types. In this embodiment, the content of the alkali-soluble polymer is 1% by mass or more and 50% by mass or less, preferably 2% by mass, when the component excluding the organic solvent contained in the photosensitive composition is 100% by mass. It is 45 mass% or less. In this case, when the content of the alkali-soluble resin is less than 1% by mass, for example, the alkali developability may be lowered, or a residue or background stain may occur on the unexposed substrate or the light-shielding layer. When it exceeds mass%, the content of the polymerizable compound is relatively lowered, and it may be difficult to achieve the desired strength as a thin film.

4). Photoradical polymerization initiator having an oxime ester structure The photoradical polymerization initiator used in the present embodiment is a compound having an oxime ester structure. A compound having an oxime ester structure is highly active with respect to irradiated light. For example, it is a shadow of a member that does not easily transmit light such as a wiring or a black matrix, and is not directly irradiated with ultraviolet rays, particles or ultraviolet absorption. Even when an agent or the like is blended, the photosensitive composition of the present embodiment can be cured by reflected light, scattered light, diffracted light, or the like.

  In addition, the photosensitive composition concerning this embodiment has a property hardened | cured with light, and has a property photopolymerized with the photoradical polymerization initiator which has an oxime ester structure. Here, light refers to electromagnetic waves such as far infrared rays, infrared rays, near infrared rays, visible rays, ultraviolet rays, vacuum ultraviolet rays, X rays and γ rays, and particle rays such as electron rays, α rays and ion rays. Curing refers to the fact that molecules in the photosensitive composition react due to receiving light to react, polymerize, form a crosslink, and the like, resulting in a decrease in fluidity. The cured product has a specific cross-linked structure derived from the polymerizable compound used.

  The radical photopolymerization initiator having an oxime ester structure is more preferably a compound represented by the following general formula (3).

In Formula (3), R1 is preferably a hydrogen atom, a phenyl group, or an alkyl group having 1 to 10 carbon atoms. In Formula (3), R2 is preferably a hydrogen atom, a phenyl group, or an alkyl group having 1 to 10 carbon atoms. In Formula (3), R3 is a monovalent organic group containing a substituted or unsubstituted carbazole group, a Ph—S—Ph—CO— group (Ph represents a phenyl group or a phenylene group), or the like. preferable.

  Moreover, an O-acyl oxime type compound can be mentioned as a radical photopolymerization initiator which has a preferable oxime ester structure as this embodiment. As the O-acyloxime compound, a carbazole-based O-acyloxime polymerization initiator is preferable. For example, 1- [9-ethyl-6-benzoylcarbazol-3-yl] -nonane-1,2-nonane-2-oxime-O-benzoate, 1- [9-ethyl-6-benzoylcarbazole-3- Yl] -nonane-1,2-nonane-2-oxime-O-acetate, 1- [9-ethyl-6-benzoylcarbazol-3-yl] -pentane-1,2-pentane-2-oxime-O- Acetate, 1- [9-ethyl-6-benzoylcarbazol-3-yl] -octane-1-one oxime-O-acetate, 1- [9-ethyl-6- (2-methylbenzoyl) carbazol-3-yl] -Ethan-1-one oxime-O-benzoate, 1- [9-ethyl-6- (2-methylbenzoyl) carbazol-3-yl] -ethane-1-one oxime- -Acetate, 1- [9-ethyl-6- (1,3,5-trimethylbenzoyl) carbazol-3-yl] -ethane-1-one oxime-O-benzoate, 1- [9-butyl-6- ( 2-ethylbenzoyl) carbazol-3-yl] -ethane-1-one oxime-O-benzoate, 1- [9-ethyl-6- (2-methyl-4-tetrahydropyranylmethoxybenzoyl) carbazol-3-yl ] -Ethane-1-one oxime-O-acetate, 1- [9-ethyl-6- (2-methyl-4-tetrahydrofuranylmethoxybenzoyl) carbazol-3-yl] -ethane-1-one oxime-O-acetate, 1- [9-Ethyl-6- [2-methyl-4- (2,2-dimethyl-1,3-dioxolanyl) methoxybenzoyl] carba Can be exemplified Lumpur 3-yl]-1-(O-acetyl oxime) or the like.

  Of these O-acyloxime compounds, in particular 1- [9-ethyl-6- (2-methylbenzoyl) carbazol-3-yl] -ethane-1-one oxime-O-acetate, 1- [9-ethyl- 6- [2-Methyl-4- (2,2-dimethyl-1,3-dioxolanyl) methoxybenzoyl] carbazol-3-yl] -1- (O-acetyloxime), an ethanone represented by the following formula (2) , 1- [9-ethyl-6- (2-methylbenzoyl) -9H-carbazol-3-yl]-, 1- (O-acetyloxime), and 1,2-octane represented by the following formula (3) Dione, 1- [4- (phenylthio) -2- (O-benzoyloxime)] is preferred because of its high sensitivity.

  Examples of commercially available compounds having an oxime ester structure include, for example, trade name: Irgacure OXE02 (CGI242) as the compound of the above formula (4), and trade name: Irgacure OXE01 as the compound of the above formula (5). (As described above, Ciba Japan Co., Ltd.) and other suitable compounds include trade name: N-1919 (manufactured by Adeka Co., Ltd.) and the like.

  Moreover, the radical photopolymerization initiator of this embodiment may be used individually by 1 type, and may be used in combination of 2 or more type. Moreover, you may combine an appropriate sensitizer and a chain transfer agent. Furthermore, what provided the crosslinkable group to radical photopolymerization initiator itself can also be used.

  The blending amount of the photo radical polymerization initiator having an oxime ester structure in the photosensitive composition of the present embodiment is 0.01% by mass or more and 20% by mass or less when the entire photosensitive composition is 100% by mass. Preferably they are 0.1 mass% or more and 15 mass% or less, More preferably, they are 0.1 mass% or more and 10 mass% or less. If the blending amount of the radical photopolymerization initiator having an oxime ester structure is smaller than the lower limit, the crosslinkability of the acrylic group may be insufficient, and sufficient hardness and dimensional stability may not be obtained. If it is larger than the range, the strength and weather resistance of the cured product after curing may be impaired.

5. Organic solvent The photosensitive composition of this embodiment contains an organic solvent. Some functions of the organic solvent include adjusting the viscosity of the photosensitive composition before curing, for example, improving applicability to a substrate, etc., and improving operability and moldability. It is done. For example, when a cured product of a photosensitive composition is used as an optical functional film, the photosensitive composition before curing may be applied to a substrate or the like on which the film is formed. The viscosity of the product is, for example, preferably 0.1 mPa · s or more and 50000 mPa · s (25 ° C.), more preferably 0.5 mPa · s or more and 10,000 mPa · s (25 ° C.).

  Examples of the organic solvent include alcohols such as methanol, ethanol, isopropanol, butanol, and octanol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; ethyl acetate, butyl acetate, ethyl lactate, γ-butyrolactone, and propylene glycol. Esters such as monomethyl ether acetate and propylene glycol monoethyl ether acetate; ethers such as polyoxyethylene lauryl ether, ethylene glycol monomethyl ether, diethylene glycol monobutyl ether and propylene glycol monomethyl ether; aromatic hydrocarbons such as benzene, toluene and xylene Amides such as dimethylformamide, dimethylacetamide, N-methylpyrrolidone, etc. It is.

  Moreover, the said organic solvent may be used individually by 1 type in the photosensitive composition of this embodiment, and may be used in combination of 2 or more type. The blending amount of the organic solvent used in the photosensitive composition of the present embodiment can be appropriately determined in consideration of the viscosity of the photosensitive composition. In addition, when handling an inorganic particle as a dispersion liquid, it can be set as the organic solvent of this embodiment including the dispersion medium in the said dispersion liquid.

6). Other Compounds The photosensitive composition of the present embodiment may contain other substances other than those described above in order to change the properties of the photosensitive composition or to impart other functions.

6.1. Surfactant The photosensitive composition of the present embodiment may contain a surfactant. Examples of the surfactant include silicone surfactants such as silicones and organopolysiloxanes, fluorine surfactants, polyoxyethylene lauryl ether, polyoxyethylene oleyl ether, polyoxyethylene octylphenyl ether, polyoxy Nonionic surfactants such as ethylene nonylphenyl ether, polyethylene glycol dilaurate, and polyethylene glycol distearate, and surfactants made of acrylic or methacrylic polymers are exemplified.

  As a preferable surfactant, a silicon-based surfactant can be exemplified. Examples of silicon surfactants include silicon surfactants having a siloxane structure, such as organopolysiloxane surfactants and silicon surfactants having a dimethylpolysiloxane-polyoxyalkylene copolymer structure. it can. A dimethylpolysiloxane-polyoxyalkylene copolymer having polydimethylsiloxane as a basic skeleton and having a polyoxyalkylene group added thereto is, for example, a trade name: SH190, SH28PA, Paintad 19, 54 from Toray Dow Corning Co., Ltd. It can be obtained as SF8428 or the like.

  Preferred fluorosurfactants include perfluoroethylene oxide surfactants or perfluoroalkyl group-containing oligomer surfactants copolymerized mainly with fluorine atom-containing ethylenically unsaturated monomers. it can.

  Further, as a perfluoroalkyl group-containing oligomer surfactant obtained by copolymerizing a fluorine atom-containing ethylenically unsaturated monomer as a main component, a bridged bond with a fluorine atom-containing ethylenically unsaturated monomer is particularly preferable. Perfluoroalkyl group-containing oligomer obtained by copolymerization of an ethylenically unsaturated monomer contained, and optionally a crosslinkable ethylenically unsaturated monomer and a polyorganosiloxyl group-containing ethylenically unsaturated monomer A system surfactant can also be suitably used for the photosensitive composition of the present embodiment.

  Examples of the fluorosurfactant include, for example, MegaFuck F-114, F410, F411, F450, F493, F494, F443, F444, F445, F446, F470, F471, F472SF, F474, F475, R30, F477. F478, F479, F480SF, F482, F483, F484, F486, F487, F553, F172D, F178K, F178RM, ESM-1, MCF350SF, BL20, R08, R61, R90 (manufactured by Dainippon Ink & Chemicals, Inc.) .

  When a surfactant is added to the photosensitive composition of the present embodiment, the above-described surfactants may be used alone or in combination of two or more.

  When a surfactant is blended in the photosensitive composition of the present embodiment, the preferable content of the surfactant is 0.0005% by mass or more and 2% by mass or less, preferably based on the total amount of the photosensitive composition. Is 0.005 mass% or more and 1 mass% or less. The preferable content of the surfactant is 0.01% by mass or more and 5% by mass or less, preferably 0.1% by mass or more when the total solid content excluding the organic solvent of the photosensitive composition is 100% by mass. It is 3 mass% or less, More preferably, it is 0.5 mass% or more and 2 mass% or less. When the blending amount of the surfactant is less than the preferable blending amount, for example, the photosensitive composition may not be able to sufficiently exhibit functions such as applicability and wettability. Moreover, when the compounding quantity of surfactant exceeds the said preferable compounding quantity, there exists a possibility that the intensity | strength of a hardening body may fall by the non-crosslinking component of a photosensitive composition increasing.

6.2. Polymerization inhibitor The photosensitive composition of this embodiment may contain a polymerization inhibitor. The polymerization inhibitor can be used, for example, to adjust the sensitivity of the photosensitive composition to light.

  Examples of the polymerization inhibitor that can be used in the photosensitive composition of the present embodiment include phenol, hydroquinone, p-methoxyphenol, benzoquinone, methoxybenzoquinone, 1,2-naphthoquinone, cresol, and pt-butylcatechol. Catechols, alkylphenols, alkylbisphenols, phenothiazine, 2,5-di-t-butylhydroquinone, 2,6-di-t-butylphenol, octadecyl-3- (3,5-di-t-butyl-4- Hydroxyphenyl) propionate, N, N′-hexamethylene bis (3,5-di-tert-butyl-4-hydroxy-hydrocinnamide), 2,2 ′ methylene bis (4-methyl-6-tert-butylphenol), 4,4'methylenebis (2,6-di-t-butylphenol), 4,4'butylide Bis (3-methyl-6-tert-butylphenol), 2,6-bis (2′-hydroxy-3′-tert-butyl-5′-methylbenzyl) 4-methylphenol, 1,1,3-tris ( 2'-methyl-5'-t-butyl-4'-hydroxyphenyl) butane, 1,3,5-trimethyl-2,4,6-tris (3'-5'-di-t-butyl-4 ' -Hydroxybenzyl) benzene, triethylene glycol bis [3- (3-t-butyl-5-methyl-4-hydroxyphenyl) propionate], pentaerythrityltetrakis [3- (3,5-di-t-butyl- 4-hydroxyphenyl) propionate], 2-t-butyl-6- (3-t-butyl-2-hydroxy-5-methylbenzyl) -4-methylphenyl acrylate, 2,4-dimethyl- phenols such as 2-t-butylphenol and 2-t-butyl-4-methoxyphenol, 6-t-butyl-m-cresol, 2,6-di-t-butyl-p-cresol, 2-t-butyl Hydroquinone, methylene blue, copper dimethyldithiocarbamate, diethyldithiocarbamate, copper dipropyldithiocarbamate, copper dibutyldithiocarbamate, copper dibutyldithiocarbamate, copper salicylate, thiodipropionates, mercaptobenzimidazole, and phosphine Among the fights, at least one kind can be mentioned. An oxygen-containing gas such as air may be used in combination. The amount of these polymerization inhibitors used is not particularly limited, but for example, 0.000005% by mass to 0.2% by mass, preferably 0.00005% by mass to 0.1%, based on the total amount of the photosensitive composition. It is as follows. The amount of the polymerization inhibitor used is 0.0001% by mass or more and 0.5% by mass or less, preferably 0.001% by mass or more, when the component excluding the organic solvent of the photosensitive composition is 100% by mass. It is 0.2 mass% or less.

7). Alkali Developability and Development Mode The photosensitive composition of the present embodiment is a negative photosensitive composition developed with an alkaline developer. The photosensitive composition of this embodiment has negative alkali developability as a result of containing at least the polymerizable compound, an alkali-soluble polymer, and a photoradical polymerization initiator having an oxime ester structure.

  The photosensitive composition of the present embodiment forms a cured body when irradiated with light. Therefore, the site | part of the photosensitive composition which was not irradiated with light with an alkali developing solution can be melt | dissolved with an alkali developing solution. Since the part irradiated with light remains by development, the photosensitive composition of this embodiment can be said to be a negative type.

  The photosensitive composition of the present embodiment can be applied, for example, in the form of a thin film or film on a substrate, and patterning is performed by irradiating the applied photosensitive composition with light in a desired pattern. A thin film (film) of the cured body can be formed. Moreover, the photosensitive composition of this embodiment does not need to be formed in a thin film before curing, and the shape of the photosensitive composition before curing may be a bulk. As a method of forming the photosensitive composition before curing in a bulk shape, for example, it may be formed by holding it in an arbitrary mold or may be formed by holding it in an appropriate container. Furthermore, when the viscosity etc. of the photosensitive composition before hardening are moderately large, you may shape | mold in arbitrary shapes. And by irradiating light to the site | part which wants to harden the photosensitive composition before hardening of such a shape, by melt | dissolving the site | part which is not hardened (light is not irradiated) with an alkali developing solution after that. A cured product having a desired shape can be obtained. Therefore, in this specification, developing has a meaning including planar patterning and three-dimensional patterning.

  The photosensitive composition of the present embodiment can be used in negative photolithography because, for example, the irradiated portion can be dissolved with an alkali developer after being irradiated with light. In this case, examples of the light source used for light irradiation include a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a low pressure mercury lamp, a metal halide lamp, a xenon lamp, a fluorescent lamp, a tungsten lamp, an argon laser, a helium cadmium laser, and various semiconductor lasers. Furthermore, other radiation generators may be used.

  The alkali developer used for developing the photosensitive composition irradiated with light is not particularly limited as long as it is a solution capable of dissolving a portion not irradiated with light. As such an alkali developer, it is sufficient that the alkali-soluble polymer contained in the photosensitive composition of the present embodiment can be dissolved, and examples thereof include an alkaline aqueous solution in which a compound exhibiting alkalinity is dissolved. Can do. As the compound exhibiting alkalinity dissolved in the alkali developer, either an inorganic compound or an organic compound may be used.

  Examples of such inorganic compounds include lithium hydroxide, sodium hydroxide, potassium hydroxide, diammonium hydrogen phosphate, dipotassium hydrogen phosphate, disodium hydrogen phosphate, lithium silicate, sodium silicate, and metasilicate. Examples thereof include sodium, potassium silicate, lithium carbonate, sodium carbonate, potassium carbonate, lithium borate, sodium borate, potassium borate, and ammonia.

  Examples of the organic compound include tetramethylammonium hydroxide, tetraethylammonium hydroxide, trimethylhydroxyethylammonium hydroxide, methylamine, dimethylamine, trimethylamine, monoethylamine, diethylamine, triethylamine, n-propylamine, and di-n. -Propylamine, isopropylamine, diisopropylamine, di-n-butylamine, methyldiethylamine, dimethylethanolamine, ethanolamine, triethanolamine, tetramethylammonium hydroxide, tetraethylammonium hydroxide, pyrrole, pihelidine and the like.

  The alkalinity (pH, concentration, etc.) and development time of the alkali developer can be appropriately adjusted according to the pattern to be formed. Furthermore, water-soluble organic solvents such as methanol, ethanol, propanol, and ethylene glycol, surfactants, storage stabilizers, and substances that adjust the dissolution of the resin are added to the alkaline developer as necessary. Can do. The density | concentration of the compound which exhibits the alkalinity in an alkali developing solution can be 0.01 mass% or more and 20 mass% or less, for example. The pH of the alkaline developer can be, for example, 10 or more and 15 or less. The processing time with the alkali developer can be, for example, from 10 seconds to 600 seconds.

  Examples of the developing method using an alkali developer include spray development, immersion development, and paddle development.

  In this specification, alkali developability refers to the performance when removing a portion of the photosensitive composition that is not irradiated with light by an alkali developer. That is, high alkali developability means that when the photosensitive composition is developed by irradiating light, the boundary between the part irradiated with light and the part not irradiated with light is clear, and It means that at least one of the photosensitive composition of the part which was not irradiated with light is completely removed is sufficient. In addition, low alkali developability means that, when the photosensitive composition is developed by irradiating light, the boundary between the part irradiated with light and the part not irradiated with light is unclear, and This means that at least one of the photosensitive composition in the portion where the irradiation was not completely removed (generation of residue) is sufficient. Further, in the aspect in which the photosensitive composition is applied to a substrate or the like and planar patterning is performed, the alkali developability can be obtained even when the photosensitive composition in the portion irradiated with light is peeled off or dropped off from the substrate. Is low.

  After processing with an alkaline developer, for example, a rinsing step can be performed. Examples of the rinsing liquid used in the rinsing step include pure water, and an appropriate amount of a surfactant or the like can be added and used. Further, after the alkali development treatment or the rinse treatment, a treatment for removing the developer or the rinse solution adhering to the formed cured body with a supercritical fluid may be performed. Furthermore, a heat treatment may be performed after the rinsing treatment or the treatment with the supercritical fluid in order to remove moisture remaining in the cured body.

8). Action Effect The photosensitive composition of the present embodiment contains a polymerizable compound, a radical photopolymerization initiator having an oxime ester structure, and an alkali-soluble polymer and inorganic particles. Therefore, since the photosensitive composition of this embodiment contains an alkali-soluble polymer at least, the alkali developability is good, the patterning by light is easy, and the moldability is excellent. Moreover, since the photosensitive composition of this embodiment contains the radical photopolymerization initiator which has an oxime ester structure, even if it contains an inorganic particle, it can fully harden | cure by light irradiation. Furthermore, since the photosensitive composition of this embodiment contains the inorganic particle which has a metal oxide as a main component, it can become a hardening body which has a high refractive index after hardening. And since the hardening body after the photosensitive composition of this embodiment hardened | cured has the structure where the polymeric compound which has a some (meth) acryloyl group in a molecule | numerator was bridge | crosslinked, it is chemically stable, a deformation | transformation and Less likely to cause alteration.

9. Optical functional film, optical member, and photoelectric conversion element The photosensitive composition of the present embodiment has a high refractive index and excellent transparency, and is excellent in alkali developability, and thus can be used in a wide range of applications. . For example, the optical functional film can be easily formed by applying and pre-baking the photosensitive composition of the present embodiment to a glass substrate or the like to form a photosensitive film and patterning it into an arbitrary shape. Such an optical functional film can be suitably used, for example, when a high refractive index layer is formed on the antireflection film. Moreover, since the photosensitive composition of the present embodiment has a high refractive index and excellent transparency, and is excellent in alkali developability, for example, the bulk photosensitive composition is patterned into an arbitrary shape. Thus, the optical member can be easily formed. Such an optical member is suitable for a sealing material such as a photoelectric conversion element, an optical member such as an optical waveguide and a lens of the photoelectric conversion element, and a thin-film optical member formed on a light receiving and emitting element of the photoelectric conversion element. Can be used. Such a photoelectric conversion element is easily developed with an alkali and has a cured film (optical member) having a high refractive index and chemical stability after curing. Therefore, the photoelectric conversion element has a high refractive index, chemical stability and moldability. Is excellent. Furthermore, in the manufacture of such a photoelectric conversion element, since a cured film (optical member) having a high refractive index and chemical stability after curing is performed by exposure and development with an alkali developer, the refractive index is low. A photoelectric conversion element having a cured film that is high and has good chemical stability can be easily produced.

10. Examples and Comparative Examples Examples and Comparative Examples are shown below to describe the present invention more specifically, but they do not limit the scope of the present invention.

10.1. Photosensitive Composition of Examples The photosensitive compositions of Examples 1 to 8 having the formulations shown in Table 1 were prepared.

  In each example, titanium oxide particles were used as inorganic particles. The titanium oxide particles used were prepared as follows.

  50 g of dimethylpolysiloxane-polyoxyalkylene copolymer and 3950 g of propylene glycol monomethyl ether (PGME) were placed in a container and sufficiently mixed and stirred. Next, 1000 g of titanium dioxide particles (trade name “Nanotek”, manufactured by C-I Kasei Co., Ltd.) was gradually added over about 10 minutes while stirring the mixture with a homogenizer. After all the titanium dioxide particles were added, the mixture was further stirred for about 15 minutes to obtain 5 kg of slurry. 5 kg of the obtained slurry and zirconia beads (bead diameter: 0.1 mm) were filled in “Picomill” manufactured by Asada Tekko Co., Ltd. so that the volume filling rate would be 70%, treated at a peripheral speed of 15 m / sec for 12 hours, and number averaged A dispersion of titanium dioxide particles having a particle diameter of 21 nm was obtained. The content of titanium dioxide in the titanium dioxide particle dispersion was 20% by mass. As a result of measuring the X-ray diffraction pattern of the titanium dioxide particles, it was found to have an anatase structure. In addition, content of the titanium oxide particle described in Table 1 is content as solid content of a titanium oxide particle.

  In each Example, as a polymerizable compound, full orange acrylate (A-BPEF: manufactured by Shin-Nakamura Chemical Co., Ltd.), dendrimer acrylate (Biscoat # 802; a mixture of tripentaerythritol octaacrylate and tripentaerythritol heptaacrylate: Osaka Organic Chemical Industry Co., Ltd.) and pentaerythritol triacrylate (PET-30: Shin-Nakamura Chemical Co., Ltd.) were used in the formulations shown in Table 1, respectively. Table 1 shows the fraction of each solid (mass fraction in solid) and the volatile component (organic) when the total amount of solid formed after the photosensitive composition is cured is 100% by mass. The blending amount of the solid content in a state including the solvent etc. is also shown.

  Moreover, in each Example, as an alkali-soluble polymer, an acrylic polymer having a carboxyl group (ARUFON UC-3910: manufactured by Toagosei Co., Ltd.), an acrylic polymer having a hydroxyl group (ARUFON UH-2032: Toagosei) And a polymer having a carboxyl group and an acrylic group (ORGA-3100: manufactured by Osaka Organic Chemical Industry Co., Ltd.) were used in the formulations shown in Table 1, respectively.

  Further, in each example, as a photo radical polymerization initiator, a compound having an oxime ester structure, 1,2-octanedione, 1- [4- (phenylthio) -2- (O-benzoyloxime)] (Irgacure OXE01: Ciba Japan Co., Ltd.), ethanone, 1- [9-ethyl-6- (2-methylbenzoyl) -9H-carbazol-3-yl]-, 1- (O-acetyloxime) (Irgacure OXE02 (CGI242) : Manufactured by Ciba Japan Co., Ltd.) and Adeka Optomer N series (N-1919: manufactured by Adeka Co., Ltd.) were used in the formulations shown in Table 1, respectively.

  In each example, dimethylpolysiloxane-polyoxyalkylene copolymer is used as the surfactant, p-methoxyphenol is used as the polymerization inhibitor, and propylene glycol monomethyl ether acetate, propylene glycol monomethyl is used as the organic solvent. Each ether was used in the formulation of Table 1.

  The photosensitive composition of each example was added to the above-mentioned dispersion of titanium dioxide particles so that the above-mentioned compounds were blended as shown in Table 1, and the organic solvent described in Table 1 was added. Prepared by stirring.

10.2. Photosensitive Composition of Comparative Example Compositions of Comparative Example 1 and Comparative Example 2 having the formulation shown in Table 1 were prepared.

  The compositions of the comparative examples were prepared in the same manner as the compositions of the examples. In Comparative Example 1, photoradical polymerization without an oxime ester structure was used instead of the photoradical polymerization initiator having an oxime ester structure. An initiator (1-hydroxy-cyclohexyl-phenyl-ketone: Irgacure 184: manufactured by Ciba Japan Co., Ltd.) was used, and in Comparative Example 2, an alkali-soluble polymer was not blended.

10.3. Evaluation Sample An evaluation sample was prepared using the composition of each Example and each Comparative Example. As an evaluation sample, one in which each composition was applied on a silicon wafer and one in which each composition was applied on a glass wafer were prepared. The composition was applied to each wafer using a spin coater manufactured by Mikasa Corporation. Each sample was pre-baked (120 ° C./60 seconds), and the one formed on the silicon wafer was used for the evaluation of alkali developability and refractive index, and the one formed on the glass wafer was transparent (transmittance). Used for evaluation. In all samples, the film thickness of the photosensitive composition after pre-baking was about 0.6 μm.

10.4. Evaluation of Alkali Developability A sample of each example and each comparative example formed on a silicon wafer was exposed to a square unexposed portion having a side of 50 μm by an exposure apparatus having a high-pressure mercury lamp as a light source (mask aligner manufactured by SUSS). It exposed so that two or more may be formed. The exposure conditions at this time were such that the illuminance was 20 mW / cm ² and the amount of light emitted from the exposed portion was 1 J / cm ² .

  In order to remove the unexposed part of each exposed sample, it is immersed (dip method) for 60 seconds in an alkaline developer (trade name CD-200CR: JSR Corporation diluted 20 times with pure water). And then washed (rinsed) with pure water for 60 seconds.

  Each sample obtained was observed with an optical microscope, and there was no residue in the unexposed part of the square, and it was judged that the cured body of the exposed part was not peeled from the silicon wafer. In Table 1, x is shown in Table 1 because there is a residue in the unexposed area or the cured body of the exposed area is peeled off from the silicon wafer.

10.5. Evaluation of Refractive Index and Transparency The refractive index of each example and each comparative example was measured on a portion of each sample formed on a silicon wafer that was not peeled off from the silicon wafer after curing. Refractive index measurement was performed using light with a wavelength of 633 nm using a device made by Metricon, a prism color Model 2010. The measurement results of the refractive index of each sample are shown in Table 1.

10.6. Evaluation of Transparency The transparency of each Example and each Comparative Example was performed by measuring the light transmittance of each sample. The light transmittance was measured for each sample deposited on a glass wafer on a portion that was not peeled off from the silicon wafer after curing. The transmittance measurement was performed using a spectrophotometer manufactured by JASCO Corporation. The light transmittance was measured with light having a wavelength of 400 nm, and the light transmittance of 90% or more is indicated as ◯, and the light transmittance of less than 90% is indicated as x.

10.7. Evaluation Results The photosensitive compositions of Examples 1 to 8 were all found to have excellent alkali developability, excellent transparency even after curing, and a high refractive index of 1.86 or more. did.

  On the other hand, the composition of Comparative Example 1 using a photoradical polymerization initiator having no oxime ester structure and the composition of Comparative Example 2 not containing an alkali-soluble polymer are both poor in alkali developability. Met.

  FIG. 1 is a result of observing a state after curing and development of the photosensitive composition of Example 1 with an optical microscope. 2 and 3 are results of observing the cured and developed states of the compositions of Comparative Examples 1 and 2 with an optical microscope.

  When FIG. 1 was seen, it turned out that the photosensitive composition of Example 1 shows favorable alkali developability. The observation results of the other photosensitive compositions of Examples 2 to 8 with the optical microscope were the same as those of Example 1. When FIG. 2 was seen, it turned out that the part of the exposure part has peeled from the silicon wafer in alkali development in the composition of the comparative example 1, and it turned out that alkali developability is unsatisfactory. When FIG. 3 was seen, the composition of the comparative example 2 turned out that the removal of an unexposed part is inadequate in alkali image development (there is a residue), and alkali developability is unsatisfactory.

  The photosensitive composition of the present invention can be used in fields such as sealing materials such as light emitting elements, optical members such as optical waveguides and lenses of optical elements, and optical functional films such as antireflection films. Since the photosensitive composition of the present invention has a high refractive index and can be easily precisely molded, it is extremely suitable for the above field.

Claims (9)

On the light emitting / receiving element,
Inorganic particles having a refractive index of 2.0 or more at a wavelength of 589 nm mainly composed of a metal oxide;
A polymerizable compound having a plurality of (meth) acryloyl groups in the molecule;
An alkali-soluble polymer having at least one of a hydroxyl group and a carboxyl group in the molecule;
A photo-radical polymerization initiator having an oxime ester structure;
A photoelectric conversion element comprising a cured film of a photosensitive composition comprising: the cured film having a content of the inorganic particles of 50% by mass or more and 90% by mass or less based on the total amount of the cured film. On the light emitting / receiving element,
Inorganic particles having a refractive index of 2.0 or more at a wavelength of 589 nm mainly composed of a metal oxide;
A polymerizable compound having a plurality of (meth) acryloyl groups in the molecule;
An alkali-soluble polymer having at least one of a hydroxyl group and a carboxyl group in the molecule;
A photo-radical polymerization initiator having an oxime ester structure;
An organic solvent,
Only including, the amount of the inorganic particles, wherein the total components except the organic solvent, coating the photosensitive composition is not more than 50 wt% to 90 wt%, the exposure process and developed with an alkaline developing solution The manufacturing method of the photoelectric conversion element which processes. A negative photosensitive composition developed with an alkaline developer,
Inorganic particles having a refractive index of 2.0 or more at a wavelength of 589 nm mainly composed of a metal oxide;
A polymerizable compound having a plurality of (meth) acryloyl groups in the molecule;
An alkali-soluble polymer having at least one of a hydroxyl group and a carboxyl group in the molecule;
A photo-radical polymerization initiator having an oxime ester structure;
An organic solvent,
Including
The photosensitive composition which the compounding quantity of the said inorganic particle is 50 to 90 mass% with respect to all the components except the said organic solvent . In claim 3,
The photosensitive composition whose main component is an oxide of at least one metal selected from titanium, zirconium, hafnium, niobium, tantalum, tungsten, cerium, indium and tin. In claim 4,
The said inorganic particle is a photosensitive composition containing the titanium dioxide which has an anatase type crystal structure, and a number average particle diameter is 1 nm or more and 100 nm or less. In any one of Claims 3 thru | or 5 ,
The photosensitive composition whose weight average molecular weights of the said alkali-soluble polymer are 1000 or more and 50000 or less. In any one of Claims 3 thru | or 6 ,
A photosensitive composition further comprising a surfactant. In any one of Claims 3 thru | or 7 ,
A photosensitive composition further comprising a polymerization inhibitor. The optical member formed by shape | molding a coating film using the photosensitive composition as described in any one of Claim 3 thru | or 8 , and carrying out the exposure process and the alkali image development process of the said coating film.