JP2009204864A - Radiation-sensitive resin composition, interlayer dielectric and microlens, and methods for producing those - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiation-sensitive resin composition which has high radiation sensitivity and enables a patterned thin film excellent in adhesion to be easily formed. <P>SOLUTION: The radiation-sensitive resin composition includes: [A] a copolymer of (a1) at least one selected from the group consisting of unsaturated carboxylic acids and unsaturated carboxylic acid anhydrides and (a2) a copolymer of an unsaturated compound comprising at least one selected from the group consisting of unsaturated compounds having an oxetanyl group and unsaturated compounds having the oxetanyl group; and [B] a 1,2-quinonediazide compound having a specific structure. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a radiation-sensitive resin composition, an interlayer insulating film and a microlens, and methods for producing them.

  In general, in an electronic component such as a thin film transistor (hereinafter referred to as “TFT”) type liquid crystal display element, magnetic head element, integrated circuit element, and solid-state imaging element, an interlayer is used to insulate between wirings arranged in layers. An insulating film is provided. As a material for producing an interlayer insulating film, a radiation-sensitive resin composition characterized in that an interlayer insulating film having a sufficient number of steps and sufficient flatness can be obtained to obtain an interlayer insulating film having a required pattern shape The thing is widely used (refer patent document 1 and patent document 2).

In general, microlenses having a lens diameter of about 5 to 100 μm, or those microlenses are used as an optical system material for an on-chip color filter such as a facsimile, an electronic copying machine, a solid-state image sensor, or an optical fiber connector. A regularly arranged microlens array is used. In manufacturing a microlens or microlens array, after forming a lens pattern, the pattern is melt-flowed by heat treatment and used as it is as a lens, or by dry etching using the melt-flowed lens pattern as a mask. A method for transferring a lens shape to a base is known. For the formation of the lens pattern, a radiation sensitive resin composition having a feature that a microlens having a desired radius of curvature is obtained is widely used (see Patent Document 3 and Patent Document 4).

  These interlayer insulating films and microlenses or microlens arrays are required to have various performances such as high heat resistance, high solvent resistance, high transparency, and adhesion to the substrate. In recent years, TFT-type liquid crystal display elements have been trended toward larger screens, and high sensitivity is required as a composition for producing an interlayer insulating film used therefor. On the other hand, when manufacturing a microlens, a good melt shape (desired radius of curvature) is required as a microlens.

JP 2001-354822 A JP 2001-343743 A JP-A-6-18702 JP-A-6-136239

The present invention has been made based on the above situation. Therefore, an object of the present invention is to provide a radiation-sensitive resin composition having a high radiation sensitivity and capable of easily forming a patterned thin film having excellent adhesion.
Another object of the present invention is to produce an interlayer insulating film having high heat resistance, high solvent resistance, high transmittance, and low dielectric constant when used for manufacturing an interlayer insulating film. When using, it is providing the radiation sensitive resin composition which can form the micro lens which has a high transmittance | permeability and a favorable melt shape.
Still another object of the present invention is to provide a method for producing an interlayer insulating film and a microlens using the above radiation sensitive resin composition.
Still another object of the present invention is to provide an interlayer insulating film and a microlens manufactured using the radiation-sensitive resin composition.
Still other objects and advantages of the present invention will become apparent from the following description.

According to the present invention, the above objects and advantages of the present invention are firstly
[A] (a1) at least one selected from the group consisting of unsaturated carboxylic acids and unsaturated carboxylic acid anhydrides, and (a2) from the group consisting of unsaturated compounds having an oxiranyl group and unsaturated compounds having an oxetanyl group A copolymer of an unsaturated compound containing at least one selected (hereinafter sometimes referred to as “copolymer [A]”), and [B] a compound represented by the following general formula (1) It is achieved by a radiation sensitive resin composition characterized by containing a 1,2-quinonediazide compound comprising

(In the general formula (1), R is independently an organic group having a hydrogen atom or a 1,2-quinonediazide group, provided that at least one of them is an organic group having a 1,2-quinonediazide group. X is independently a methylene group or a substituted or unsubstituted alkylene group having 2 to 8 carbon atoms, Y is independently a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, 10 substituted or unsubstituted alkenyl groups, substituted or unsubstituted alkynyl groups having 2 to 10 carbon atoms, substituted or unsubstituted aralkyl groups having 7 to 10 carbon atoms, substituted or unsubstituted alkoxy groups having 1 to 10 carbon atoms Or a substituted or unsubstituted phenoxy group, and q is 0 or 1 independently of each other.)

Secondly, the objects and advantages of the present invention are:
This is achieved by a method for manufacturing an interlayer insulating film or a microlens, which includes the following steps in the order described below.
(1) The process of forming the coating film of said radiation sensitive composition on a board | substrate,
(2) A step of irradiating at least a part of the coating film with radiation,
(3) Development step, and (4) Heating step.

According to the radiation sensitive resin composition of the present invention, it is possible to easily form a patterned thin film having high radiation sensitivity and excellent adhesion.
The interlayer insulating film of the present invention formed from the above composition has good adhesion to the substrate, excellent solvent resistance and heat resistance, high transmittance, low dielectric constant, It can be suitably used as an interlayer insulating film for parts.
Further, the microlens of the present invention formed from the upper composition has good adhesion to the substrate, excellent solvent resistance and heat resistance, and has a high transmittance and a good melt shape, It can be suitably used as a microlens for a solid-state image sensor.

  Hereinafter, the radiation sensitive resin composition of this invention is explained in full detail.

Copolymer [A]
The copolymer [A] used in the present invention is (a1) at least one selected from the group consisting of an unsaturated carboxylic acid and an unsaturated carboxylic acid anhydride (hereinafter referred to as “compound (a1)”). (A2) An unsaturated compound containing at least one selected from the group consisting of an unsaturated compound having an oxiranyl group and an unsaturated compound having an oxetanyl group (hereinafter referred to as “compound (a2)”) in a solvent It can be produced by radical polymerization in the presence of a polymerization initiator.

The compound (a1) is an unsaturated carboxylic acid and / or unsaturated carboxylic acid anhydride having radical polymerizability, such as monocarboxylic acid, dicarboxylic acid, dicarboxylic acid anhydride, polyvalent carboxylic acid mono [(meth)]. Acryloyloxyalkyl] ester, mono (meth) acrylate of a polymer having a carboxyl group and a hydroxyl group at both ends, a polycyclic compound having a carboxyl group, and anhydrides thereof.
Specific examples thereof include monocarboxylic acids such as acrylic acid, methacrylic acid, and crotonic acid;
Examples of dicarboxylic acids include maleic acid, fumaric acid, citraconic acid, mesaconic acid, itaconic acid and the like;
As anhydrides of dicarboxylic acids, for example, anhydrides of the compounds exemplified as the above dicarboxylic acids;
Examples of mono [(meth) acryloyloxyalkyl] esters of polyvalent carboxylic acids such as succinic acid mono [2- (meth) acryloyloxyethyl] and phthalic acid mono [2- (meth) acryloyloxyethyl];
Examples of the mono (meth) acrylate of a polymer having a carboxyl group and a hydroxyl group at both ends, such as ω-carboxypolycaprolactone mono (meth) acrylate;
Examples of the polycyclic compound having a carboxyl group and anhydrides thereof include 5-carboxybicyclo [2.2.1] hept-2-ene, 5,6-dicarboxybicyclo [2.2.1] hept-2- Ene, 5-carboxy-5-methylbicyclo [2.2.1] hept-2-ene, 5-carboxy-5-ethylbicyclo [2.2.1] hept-2-ene, 5-carboxy-6- Methylbicyclo [2.2.1] hept-2-ene, 5-carboxy-6-ethylbicyclo [2.2.1] hept-2-ene, 5,6-dicarboxybicyclo [2.2.1] And hept-2-ene anhydride.
Of these, monocarboxylic acid and dicarboxylic acid anhydrides are preferably used. In particular, acrylic acid, methacrylic acid, and maleic anhydride are preferably used from the viewpoint of copolymerization reactivity, solubility in an alkali developer, and availability. It is done. These compounds (a1) are used alone or in combination of two or more.

  The compound (a2) is a radically polymerizable unsaturated compound having an oxiranyl group and / or a radically polymerizable unsaturated compound having an oxetanyl group. Examples of the radically polymerizable unsaturated compound having an oxiranyl group include glycidyl acrylate, methacrylic acid Glycidyl acid, glycidyl α-ethyl acrylate, glycidyl α-n-propyl acrylate, glycidyl α-n-butyl acrylate, 3,4-epoxybutyl acrylate, 3,4-epoxybutyl methacrylate, acrylic acid -6,7-epoxyheptyl, methacrylic acid-6,7-epoxyheptyl, α-ethylacrylic acid-6,7-epoxyheptyl, acrylic acid-3,4-epoxycyclohexyl, methacrylic acid-3,4-epoxycyclohexyl , Acrylic acid-3,4-epoxy Black hexyl methyl methacrylate-3,4-epoxy cyclohexylmethyl, o- vinylbenzyl glycidyl ether, m- vinylbenzyl glycidyl ether, p- vinylbenzyl glycidyl ether. Among these, glycidyl methacrylate, methacrylic acid-6,7-epoxyheptyl, o-vinylbenzyl glycidyl ether, m-vinylbenzyl glycidyl ether, p-vinylbenzyl glycidyl ether, methacrylic acid-3,4-epoxycyclohexyl, methacryl Acid-3,4-epoxycyclohexylmethyl is preferably used from the viewpoint of increasing the copolymerization reactivity and the heat resistance and surface hardness of the resulting interlayer insulating film or microlens.

Examples of the radical polymerizable unsaturated compound having an oxetanyl group include 3- (acryloyloxymethyl) oxetane, 3- (acryloyloxymethyl) -2-methyloxetane, 3- (acryloyloxymethyl) -3-ethyloxetane, 3 -(Acryloyloxymethyl) -2-trifluoromethyloxetane, 3- (acryloyloxymethyl) -2-pentafluoroethyloxetane, 3- (acryloyloxymethyl) -2-phenyloxetane, 3- (acryloyloxymethyl)- 2,2-difluorooxetane, 3- (acryloyloxymethyl) -2,2,4-trifluorooxetane, 3- (acryloyloxymethyl) -2,2,4,4-tetrafluorooxetane, 3- (2- Acryloyloxyethyl) Oki Tan, 3- (2-acryloyloxyethyl) -2-ethyloxetane, 3- (2-acryloyloxyethyl) -3-ethyloxetane, 3- (2-acryloyloxyethyl) -2-trifluoromethyloxetane, 3 -(2-acryloyloxyethyl) -2-pentafluoroethyloxetane, 3- (2-acryloyloxyethyl) -2-phenyloxetane, 3- (2-acryloyloxyethyl) -2,2-difluorooxetane, 3- Acrylic esters such as (2-acryloyloxyethyl) -2,2,4-trifluorooxetane, 3- (2-acryloyloxyethyl) -2,2,4,4-tetrafluorooxetane,
3- (methacryloyloxymethyl) oxetane, 3- (methacryloyloxymethyl) -2-methyloxetane, 3- (methacryloyloxymethyl) -3-ethyloxetane, 3- (methacryloyloxymethyl) -2-trifluoromethyloxetane, 3- (methacryloyloxymethyl) -2-pentafluoroethyloxetane, 3- (methacryloyloxymethyl) -2-phenyloxetane, 3- (methacryloyloxymethyl) -2,2-difluorooxetane, 3- (methacryloyloxymethyl) -2,2,4-trifluorooxetane, 3- (methacryloyloxymethyl) -2,2,4,4-tetrafluorooxetane, 3- (2-methacryloyloxyethyl) oxetane, 3- (2-methacryloyloxyethyl) 2-ethyloxetane, 3- (2-methacryloyloxyethyl) -3-ethyloxetane, 3- (2-methacryloyloxyethyl) -2-tolylolomethyloxetane, 3- (2-methacryloyloxyethyl) -2- Pentafluoroethyloxetane, 3- (2-methacryloyloxyethyl) -2-phenyloxetane, 3- (2-methacryloyloxyethyl) -2,2-difluorooxetane, 3- (2-methacryloyloxyethyl) -2,2 , 4-trifluorooxetane, methacrylic acid esters such as 3- (2-methacryloyloxyethyl) -2,2,4,4-tetrafluorooxetane, and the like.
Of these, 3- (acryloyloxymethyl) -2-methyloxetane, 3- (acryloyloxymethyl) -3-ethyloxetane, 3- (methacryloyloxymethyl) -2-methyloxetane, 3- (methacryloyloxymethyl) -3-Ethyloxetane or the like is preferably used from the viewpoint of polymerizability.
These compounds (a2) are used alone or in combination.

  The copolymer [A] used in the present invention is a copolymer of the above-mentioned compounds (a1) and (a2) and another unsaturated compound copolymerizable with these compounds (hereinafter referred to as “compound (a3)”). Such a compound (a3) is not particularly limited as long as it is an unsaturated compound having radical polymerizability, and examples thereof include methacrylic acid alkyl esters, methacrylic acid cyclic alkyl esters, and acrylic compounds. Acid alkyl ester, acrylic acid cyclic alkyl ester, methacrylic acid aryl ester, acrylic acid aryl ester, unsaturated dicarboxylic acid diester, methacrylic acid ester having a hydroxyl group, bicyclounsaturated compound, maleimide compound, unsaturated aromatic compound, conjugated diene, Tetrahydrofuran skeleton, furan skeleton, tetrahydropyran skeleton, Down skeleton, and (poly) unsaturated compound having an alkylene glycol unit, a phenolic hydroxyl group-containing unsaturated compound represented by the following formula (I) and other unsaturated compounds.

Here, R ⁴ is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, R ^{6 to} R ¹⁰ are the same or different, and are a hydrogen atom, a hydroxyl group or an alkyl group having 1 to 4 carbon atoms, and R ⁵ is A single bond, —COO—, or —CONH—, and s is an integer of 0 to 3, provided that at least one of R ^{6 to} R ¹⁰ is a hydroxyl group.

Specific examples thereof include methacrylic acid alkyl esters such as methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, sec-butyl methacrylate, t-butyl methacrylate, 2-ethylhexyl methacrylate, isodecyl methacrylate, and n-lauryl methacrylate. , Tridecyl methacrylate, n-stearyl methacrylate and the like; cyclic esters of methacrylic acid such as cyclohexyl methacrylate, 2-methylcyclohexyl methacrylate, tricyclo [5.2.1.0 ^2,6 ] decan-8-yl methacrylate ( Hereinafter, referred to as “dicyclopentanyl methacrylate”), tricyclo [5.2.1.0 ^2,6 ] decan-8-yloxyethyl methacrylate, isoboronyl meta. Examples of acrylic acid alkyl esters include, for example, methyl acrylate, ethyl acrylate, n-propyl acrylate, i-propyl acrylate, n-butyl acrylate, sec-butyl acrylate, t-butyl acrylate, and the like; cyclic esters of acrylic acid As, for example, cyclohexyl acrylate, 2-methylcyclohexyl acrylate, tricyclo [5.2.1.0 ^2,6 ] decan-8-yl acrylate (hereinafter referred to as “dicyclopentanyl acrylate”), tricyclo [5. 2.1.0 ^2,6 ] decan-8-yloxyethyl acrylate, isobornyl acrylate and the like; acrylic acid aryl esters such as phenyl acrylate and benzyl acrylate; Examples of ester esters include phenyl methacrylate and benzyl methacrylate; unsaturated dicarboxylic acid diesters such as diethyl maleate, diethyl fumarate and diethyl itaconate; and methacrylates having a hydroxyl group such as hydroxymethyl methacrylate, 2 -Hydroxyethyl methacrylate, 3-hydroxypropyl methacrylate, 4-hydroxybutyl methacrylate, diethylene glycol monomethacrylate, 2,3-dihydroxypropyl methacrylate, 2-methacryloxyethylglycoside, etc .;

  Examples of the bicyclo unsaturated compound include bicyclo [2.2.1] hept-2-ene, 5-methylbicyclo [2.2.1] hept-2-ene, 5-ethylbicyclo [2.2.1]. Hept-2-ene, 5-hydroxybicyclo [2.2.1] Hept-2-ene, 5-carboxybicyclo [2.2.1] Hept-2-ene, 5-hydroxymethylbicyclo [2.2. 1] Hept-2-ene, 5- (2-hydroxyethyl) bicyclo [2.2.1] Hept-2-ene, 5-methoxybicyclo [2.2.1] Hept-2-ene, 5-ethoxy Bicyclo [2.2.1] hept-2-ene, 5,6-dihydroxybicyclo [2.2.1] hept-2-ene, 5,6-dicarboxybicyclo [2.2.1] hept-2 -Ene, 5,6-di (hydroxymethyl) bicyclo [2.2 .1] Hept-2-ene, 5,6-di (2-hydroxyethyl) bicyclo [2.2.1] Hept-2-ene, 5,6-dimethoxybicyclo [2.2.1] Hept-2 -Ene, 5,6-diethoxybicyclo [2.2.1] hept-2-ene, 5-hydroxy-5-methylbicyclo [2.2.1] hept-2-ene, 5-hydroxy-5 Ethylbicyclo [2.2.1] Hept-2-ene, 5-carboxy-5-methylbicyclo [2.2.1] Hept-2-ene, 5-carboxy-5-ethylbicyclo [2.2.1] ] Hept-2-ene, 5-hydroxymethyl-5-methylbicyclo [2.2.1] hept-2-ene, 5-carboxy-6-methylbicyclo [2.2.1] hept-2-ene, 5-carboxy-6-ethylbicyclo [2.2.1] hept-2-ene 5,6-dicarboxybicyclo [2.2.1] hept-2-ene anhydride (hymic acid anhydride), 5-t-butoxycarbonylbicyclo [2.2.1] hept-2-ene, 5- Cyclohexyloxycarbonylbicyclo [2.2.1] hept-2-ene, 5-phenoxycarbonylbicyclo [2.2.1] hept-2-ene, 5,6-di (t-butoxycarbonyl) bicyclo [2. 2.1] hept-2-ene, 5,6-di (cyclohexyloxycarbonyl) bicyclo [2.2.1] hept-2-ene and the like;

  Examples of unsaturated dicarbonylimide derivatives include N-phenylmaleimide, N-cyclohexylmaleimide, N-benzylmaleimide, N- (4-hydroxyphenyl) maleimide, N- (4-hydroxybenzyl) maleimide, N-succinimidyl- 3-maleimidobenzoate, N-succinimidyl-4-maleimidobutyrate, N-succinimidyl-6-maleimidocaproate, N-succinimidyl-3-maleimidopropionate, N- (9-acridinyl) maleimide and the like;

As unsaturated aromatic compounds, for example, styrene, α-methylstyrene, m-methylstyrene, p-methylstyrene, vinyltoluene, p-methoxystyrene, etc .; as conjugated dienes, for example, 1,3-butadiene, isoprene, 2 As unsaturated compounds containing a tetrahydrofuran skeleton, for example, tetrahydrofurfuryl (meth) acrylate, 2-methacryloyloxy-propionic acid tetrahydrofurfuryl ester, 3- (meth) acryloyl As unsaturated compounds containing a furan skeleton, for example, 2-methyl-5- (3-furyl) -1-penten-3-one, furfuryl (meth) acrylate, 1-furan- 2-butyl-3-en-2-one, 1 Furan-2-butyl-3-methoxy-3-en-2-one, 6- (2-furyl) -2-methyl-1-hexen-3-one, 6-furan-2-yl-hex-1- En-3-one, acrylic acid 2-furan-2-yl-1-methyl-ethyl ester, 6- (2-furyl) -6-methyl-1-hepten-3-one, etc .; containing tetrahydropyran skeleton Examples of unsaturated compounds include (tetrahydropyran-2-yl) methyl methacrylate, 2,6-dimethyl-8- (tetrahydropyran-2-yloxy) -oct-1-en-3-one, and tetrahydropyran 2-methacrylate. 2-yl ester, 1- (tetrahydropyran-2-oxy) -butyl-3-en-2-one, etc .; unsaturated compounds containing a pyran skeleton include, for example, 4- (1, 4-dioxa-5-oxo-6-heptenyl) -6-methyl-2-pyrone, 4- (1,5-dioxa-6-oxo-7-octenyl) -6-methyl-2-pyrone, etc .;
Examples of unsaturated compounds having a (poly) alkylene glycol unit include polyethylene glycol (n = 2 to 10) mono (meth) acrylate, polypropylene glycol (n = 2 to 10) mono (meth) acrylate, and the like;
Examples of the unsaturated compound containing a phenol skeleton include compounds represented by the following formulas (I-1) to (I-5) from the compound represented by the above formula (I) according to the definitions of R ⁵ and s;

(In formula (I-1), t is an integer of 1 to 3, and the definitions of R ⁴ , R ⁶ , R ⁷ , R ⁸ , R ⁹ , and R ¹⁰ are the same as in formula (I).)

(In formula (I-2), the definitions of R ⁴ , R ⁶ , R ⁷ , R ⁸ , R ⁹ , and R ¹⁰ are the same as those in formula (I) above.)

(In formula (I-3), t is an integer of 1 to 3. The definitions of R ⁴ , R ⁶ , R ⁷ , R ⁸ , R ⁹ , and R ¹⁰ are the same as those in formula (I) above. )

（式（Ｉ−４）中、Ｒ^４、Ｒ^６、Ｒ^７、Ｒ^８、Ｒ^９、およびＲ^１０の定義は上記式（Ｉ）に同じである。）

(In formula (I-4), the definitions of R ⁴ , R ⁶ , R ⁷ , R ⁸ , R ⁹ , and R ¹⁰ are the same as those in formula (I) above.)

(In formula (I-5), the definitions of R ⁴ , R ⁶ , R ⁷ , R ⁸ , R ⁹ , and R ¹⁰ are the same as those in formula (I) above.)

Examples of other unsaturated compounds include acrylonitrile, methacrylonitrile, vinyl chloride, vinylidene chloride, acrylamide, methacrylamide, and vinyl acetate.

Among these, methacrylic acid alkyl ester, methacrylic acid cyclic alkyl ester, maleimide compound, tetrahydrofuran skeleton, furan skeleton, tetrahydropyran skeleton, pyran skeleton, unsaturated compound having a (poly) alkylene glycol unit, represented by the above formula (I) The phenolic hydroxyl group-containing unsaturated compounds are preferably used, particularly styrene, t-butyl methacrylate, tricyclo [5.2.1.0 ^2,6 ] decan-8-yl methacrylate, p-methoxystyrene, 2-methyl. Cyclohexyl methacrylate, N-phenylmaleimide, N-cyclohexylmaleimide, tetrahydrofurfuryl (meth) acrylate, polyethylene glycol (n = 2 to 10) mono (meth) acrylate, 3- (meth) acryloyloxytetrahydride Furan-2-one, 4-hydroxybenzyl (meth) acrylate, 4-hydroxyphenyl (meth) acrylate, o-hydroxystyrene, p-hydroxystyrene, α-methyl-p-hydroxystyrene are copolymerized and alkali developed. It is preferable from the viewpoint of solubility in the liquid.
These compounds (a3) are used alone or in combination of two or more.

Preferable specific examples of the copolymer [A] used in the present invention include, for example, methacrylic acid / tricyclo [5.2.1.0 ^2,6 ] decan-8-yl methacrylate / glycidyl methacrylate / 2-methyl. Cyclohexyl acrylate / N- (3,5-dimethyl-4-hydroxybenzyl) methacrylamide copolymer, methacrylic acid / glycidyl methacrylate / 1- (tetrahydropyran-2-oxy) -butyl-3-en-2-one / N-cyclohexylmaleimide / p-methoxystyrene / 3-ethyl-3-methacryloyloxymethyloxetane / N- (3,5-dimethyl-4-hydroxybenzyl) methacrylamide copolymer, methacrylic acid / tricyclo [5.2 1.0 ^2,6 ] decan-8-yl methacrylate / styrene / N-phenylmer Reimide / N- (4-hydroxyphenyl) methacrylamide copolymer, methacrylic acid / glycidyl methacrylate / tricyclo [5.2.1.0 ^2,6 ] decan-8-yl methacrylate / n-lauryl methacrylate / 3- Methacryloyloxytetrahydrofuran-2-one / N- (4-hydroxyphenyl) methacrylamide copolymer, methacrylic acid / glycidyl methacrylate / styrene / 2-methylcyclohexyl acrylate / 1- (tetrahydropyran-2-oxy) -butyl- 3-en-2-one / 4-hydroxybenzyl methacrylate copolymer, methacrylic acid / glycidyl methacrylate / tricyclo [5.2.1.0 ^2,6 ] decan-8-yl methacrylate / p-methoxystyrene / 4 -Hydroxybenzyl methacrylate Polymer, methacrylic acid / tricyclo [5.2.1.0 ^2,6 ] decan-8-yl methacrylate / glycidyl methacrylate / styrene / p-vinylbenzyl glycidyl ether / tetrahydrofurfuryl methacrylate / 4-hydroxyphenyl methacrylate Polymer, methacrylic acid / glycidyl methacrylate / N-cyclohexylmaleimide / α-methyl-p-hydroxystyrene / tetrahydrofurfuryl methacrylate copolymer, methacrylic acid / glycidyl methacrylate / N-cyclohexylmaleimide / 3-ethyl-3- Methacryloyloxymethyloxetane / 3-methacryloyloxytetrahydrofuran-2-one / tetrahydrofurfuryl methacrylate / 4-hydroxyphenyl methacrylate copolymer, methacrylic acid / meth Glycidyl tacrylate / 3-ethyl-3-methacryloyloxymethyloxetane / tetrahydrofurfuryl methacrylate / N-phenylmaleimide / α-methyl-p-hydroxystyrene copolymer, methacrylic acid / glycidyl methacrylate / 3-ethyl-3- And methacryloyloxymethyloxetane / tricyclo [5.2.1.0 ^2,6 ] decan-8-yl methacrylate / N-cyclohexylmaleimide / n-lauryl methacrylate / α-methyl-p-hydroxystyrene copolymer. .

The copolymer [A] used in the present invention is preferably a structural unit derived from the compound (a1) based on the total of repeating units derived from the compounds (a1), (a2) and (a3). 5 to 40% by weight, particularly preferably 5 to 25% by weight. When a copolymer having a constitutional unit of less than 5% by weight is used, it is difficult to dissolve in an alkaline aqueous solution during the development step, while a copolymer exceeding 40% by weight tends to be too soluble in an aqueous alkaline solution. .
In addition, the copolymer [A] used in the present invention has a structural unit derived from the compound (a2) based on the total of repeating units derived from the compounds (a1), (a2) and (a3). , Preferably 10 to 80% by weight, particularly preferably 30 to 80% by weight. When this structural unit is less than 10% by weight, the heat resistance, surface hardness and stripping solution resistance of the obtained interlayer insulating film and microlens tend to decrease, while when the amount of this structural unit exceeds 80% by weight. The storage stability of the radiation sensitive resin composition tends to decrease.

The copolymer [A] used in the present invention has a polystyrene-reduced weight average molecular weight (hereinafter referred to as “Mw”), preferably 2 × 10 ³ to 1 × 10 ⁵ , more preferably 5 × 10 ^{3 to} 5 × 10. ⁴ . If the Mw is less than 2 × 10 ³ , the development margin may not be sufficient, the remaining film ratio of the resulting film may decrease, the pattern shape of the resulting interlayer insulating film or microlens, heat resistance, etc. On the other hand, if it exceeds 1 × 10 ⁵ , the sensitivity may be lowered or the pattern shape may be inferior. The molecular weight distribution (hereinafter referred to as “Mw / Mn”) is preferably 5.0 or less, more preferably 3.0 or less. If Mw / Mn exceeds 5.0, the pattern shape of the resulting interlayer insulating film or microlens may be inferior. The radiation-sensitive resin composition containing the copolymer [A] can easily form a predetermined pattern shape without causing a development residue during development.

[A] The copolymer is synthesized, for example, by polymerizing the unsaturated compound (a1), the unsaturated compound (a2), and the unsaturated compound (a3) in an appropriate solvent in the presence of a radical polymerization initiator. can do.
Examples of the solvent used for the polymerization include alcohol, ether, glycol ether, ethylene glycol alkyl ether acetate, diethylene glycol, propylene glycol monoalkyl ether, propylene glycol alkyl ether acetate, propylene glycol alkyl ether propionate, and aromatic hydrocarbon. , Ketones, esters and the like.

  Specific examples of these solvents include alcohols such as methanol, ethanol, benzyl alcohol, 2-phenylethanol, and 3-phenyl-1-propanol; ethers such as tetrahydrofuran; ethylene glycol ethers such as ethylene glycol monomethyl. Ether, ethylene glycol monoethyl ether, etc .; ethylene glycol alkyl ether acetates, ethylene glycol methyl ether acetate, ethylene glycol ethyl ether acetate, ethylene glycol n-propyl ether acetate, ethylene glycol n-butyl ether acetate, etc .; diethylene glycols, diethylene glycol Monomethyl ether, diethylene glycol monoethyl ether, Ethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol ethyl methyl ether,

  As propylene glycol ethers, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol mono-n-propyl ether, propylene glycol mono-n-butyl ether, etc .; as propylene glycol alkyl ether acetates, propylene glycol methyl ether acetate, propylene Glycol ethyl ether acetate, propylene glycol n-propyl ether acetate, propylene glycol n-butyl ether acetate, etc .; as propylene glycol alkyl ether propionates, propylene glycol methyl ether propionate, propylene glycol ethyl ether propionate, propylene glycol n -Propyl A Rupuropioneto, propylene glycol n- butyl ether propionate; aromatic hydrocarbons, toluene, xylene and the like; as ketones, methyl ethyl ketone, cyclohexanone, 4-hydroxy-4-methyl-2-pentanone and the like;

  Examples of esters include methyl acetate, ethyl acetate, propyl acetate, butyl acetate, ethyl 2-hydroxypropionate, methyl 2-hydroxy-2-methylpropionate, ethyl 2-hydroxy-2-methylpropionate, methyl hydroxyacetate, hydroxy Ethyl acetate, hydroxybutyl acetate, methyl lactate, ethyl lactate, propyl lactate, butyl lactate, methyl 3-hydroxypropionate, ethyl 3-hydroxypropionate, propyl 3-hydroxypropionate, butyl 3-hydroxypropionate, 2-hydroxy -3-methylbutanoate, methyl methoxyacetate, ethyl methoxyacetate, propyl methoxyacetate, butyl methoxyacetate, methyl ethoxyacetate, ethyl ethoxyacetate, propyl ethoxyacetate, butyl ethoxyacetate, propoxy Methyl acetate, ethyl propoxyacetate, propyl propoxyacetate, butyl propoxyacetate, methyl butoxyacetate, ethyl butoxyacetate, propyl butoxyacetate, butylbutoxyacetate, methyl 2-methoxypropionate, ethyl 2-methoxypropionate, 2-methoxypropionic acid Propyl, butyl 2-methoxypropionate, methyl 2-ethoxypropionate, ethyl 2-ethoxypropionate, propyl 2-ethoxypropionate, butyl 2-ethoxypropionate, methyl 2-butoxypropionate, ethyl 2-butoxypropionate Propyl 2-butoxypropionate, butyl 2-butoxypropionate, methyl 3-methoxypropionate, ethyl 3-methoxypropionate, propyl 3-methoxypropionate, 3-methoxypropyl Butyl pionate, methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate, propyl 3-ethoxypropionate, butyl 3-ethoxypropionate, methyl 3-propoxypropionate, ethyl 3-propoxypropionate, 3-propoxypropionate Examples thereof include esters such as propyl acid, butyl 3-propoxypropionate, methyl 3-butoxypropionate, ethyl 3-butoxypropionate, propyl 3-butoxypropionate, and butyl 3-butoxypropionate.

  Of these, ethylene glycol alkyl ether acetate, diethylene glycol, propylene glycol monoalkyl ether, and propylene glycol alkyl ether acetate are preferable. Particularly, diethylene glycol dimethyl ether, diethylene glycol ethyl methyl ether, propylene glycol methyl ether, propylene glycol ethyl ether, propylene glycol methyl ether. Acetate and methyl 3-methoxypropionate are preferred.

As the polymerization initiator used for the production of the copolymer [A], those generally known as radical polymerization initiators can be used. For example, 2,2′-azobisisobutyronitrile, 2,2′-azobis- (2,4-dimethylvaleronitrile), 2,2′-azobis- (4-methoxy-2,4-dimethylvaleronitrile) Azo compounds such as benzoyl peroxide, lauroyl peroxide, t-butyl peroxypivalate, organic peroxides such as 1,1′-bis- (t-butylperoxy) cyclohexane, and hydrogen peroxide. When a peroxide is used as the radical polymerization initiator, the peroxide may be used together with a reducing agent to form a redox initiator.
In the production of the copolymer [A], a molecular weight modifier can be used to adjust the molecular weight. Specific examples thereof include halogenated hydrocarbons such as chloroform and carbon tetrabromide; mercaptans such as n-hexyl mercaptan, n-octyl mercaptan, n-dodecyl mercaptan, tert-dodecyl mercaptan and thioglycolic acid; dimethylxanthogen Xanthogens such as sulfide and diisopropylxanthogen disulfide; terpinolene, α-methylstyrene dimer and the like.

[B] Component The [B] component used in the present invention is a 1,2-quinonediazide compound that generates a carboxylic acid upon irradiation with radiation, and is a compound represented by the above general formula (1) (hereinafter referred to as “compound ( B) "may be included.) By including such a component, the sensitivity of the radiation-sensitive resin composition is improved, and an interlayer insulating film having excellent solvent resistance and adhesion and a low dielectric constant can be produced.

In addition, the said general formula (1) can also be shown like the following general formula (1-1).

(In the general formula (1-1), R, X, Y and q have the same meanings as R, X, Y and q in the general formula (1), respectively.)
Among the compounds represented by the general formula (1), a compound represented by the following general formula (2) is preferable. That is, in the general formula (1), it is preferable that X is a propylene group and q is 0. The compound represented by the following general formula (2) is a compound that can be produced with high yield among the compounds represented by the general formula (1).

（一般式（２）において、Ｒは一般式（１）におけるＲと同義である。）

(In General Formula (2), R has the same meaning as R in General Formula (1).)

In the general formula (1), at least one of R is preferably a hydrogen atom. When all Rs in the general formula (1) are groups other than hydrogen atoms, the storage stability of the resulting radiation-sensitive composition solution tends to decrease.

In the present invention, the ratio of the organic group having a 1,2-naphthoquinonediazide group out of all R in the compound represented by the general formula (1) is particularly preferably 30 to 85 mol%. 50 to 70 mol% is most preferable. When the ratio is less than 30 mol%, the solubility in the radiation-sensitive composition solution tends to decrease. On the other hand, when it exceeds 85 mol%, the storage stability of the resulting radiation-sensitive composition solution tends to be lowered. Here, the ratio of the organic group having a 1,2-naphthoquinonediazide group out of all R in the compound represented by the general formula (1) is a value calculated from the result of ¹ H-NMR analysis.

  Examples of the organic group having a 1,2-quinonediazide group of R include 1,2-benzoquinonediazide-4-sulfonyl group, 1,2-naphthoquinonediazide-4-sulfonyl group, and 1,2-naphthoquinonediazide-5. A 1,2-quinonediazidosulfonyl group such as a -sulfonyl group can be mentioned. Of these, 1,2-naphthoquinonediazido-4-sulfonyl group and 1,2-naphthoquinonediazide-5-sulfonyl group are preferable, and 1,2-naphthoquinonediazide-5-sulfonyl group is particularly preferable.

  For example, the compound (B) is obtained by subjecting a compound represented by the following general formula (1-2) and a compound represented by the following general formula (1-3) to a condensation reaction by the following general formula (1-4). After obtaining the precursor represented, it can be obtained by introducing at least one organic group having a 1,2-quinonediazide group into the precursor represented by the following general formula (1-4).

（一般式（１−２）において、Ｙは、炭素数１〜１０の置換若しくは非置換のアルキル基、炭素数２〜１０の置換若しくは非置換のアルケニル基、炭素数２〜１０の置換若しくは非置換のアルキニル基、炭素数７〜１０の置換若しくは非置換のアラルキル基、炭素数１〜１０の置換若しくは非置換のアルコキシ基、または置換若しくは非置換のフェノキシ基であり、ｑは０または１である。）

(In General Formula (1-2), Y represents a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 10 carbon atoms, a substituted or non-substituted group having 2 to 10 carbon atoms. A substituted alkynyl group, a substituted or unsubstituted aralkyl group having 7 to 10 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 10 carbon atoms, or a substituted or unsubstituted phenoxy group, and q is 0 or 1 is there.)

（一般式（１−３）において、Ｘは炭素数１〜８の置換または非置換のアルキレン基である。）

(In General Formula (1-3), X represents a substituted or unsubstituted alkylene group having 1 to 8 carbon atoms.)

（一般式（１−４）において、Ｘは相互に独立にメチレン基または炭素数２〜８の置換もしくは非置換のアルキレン基であり、Ｙは相互に独立に炭素数１〜１０の置換若しくは非置換のアルキル基、炭素数２〜１０の置換若しくは非置換のアルケニル基、炭素数２〜１０の置換若しくは非置換のアルキニル基、炭素数７〜１０の置換若しくは非置換のアラルキル基、炭素数１〜１０の置換若しくは非置換のアルコキシ基、または置換若しくは非置換のフェノキシ基である。ｑは相互に独立に０または１である。）

(In the general formula (1-4), X is independently a methylene group or a substituted or unsubstituted alkylene group having 2 to 8 carbon atoms, and Y is independently a substituted or non-substituted group having 1 to 10 carbon atoms. Substituted alkyl group, substituted or unsubstituted alkenyl group having 2 to 10 carbon atoms, substituted or unsubstituted alkynyl group having 2 to 10 carbon atoms, substituted or unsubstituted aralkyl group having 7 to 10 carbon atoms, carbon number 1 A substituted or unsubstituted alkoxy group of 10 to 10 or a substituted or unsubstituted phenoxy group, q is 0 or 1 independently of each other.)

  The conditions (methods) of the condensation reaction are not particularly limited, and a conventionally known method can be adopted. For example, a method of reacting at 60 to 90 ° C. for 12 to 50 hours in the presence of a catalyst such as an acid catalyst. Can be mentioned.

  The conditions (method) for introducing the organic group having a 1,2-quinonediazide group into the precursor represented by the general formula (1-4) are not particularly limited, and a conventionally known method can be adopted. For example, 1,2-quinonediazidosulfonyl chloride such as 1,2-naphthoquinonediazide-4-sulfonyl chloride, 1,2-naphthoquinonediazide-5-sulfonyl chloride is esterified in the presence of a basic catalyst. A method can be mentioned.

  The amount of the organic group having a 1,2-naphthoquinonediazide group out of all the R in the compound represented by the general formula (1) is represented by the above general formula (1-4). It can adjust by adjusting the total amount of the compound for introduce | transducing the organic group which has a 1, 2- naphthoquinone diazide group added with respect to a precursor.

  In addition, as a method for producing the compound represented by the general formula (2), first, a compound represented by the following formula (5) and a compound represented by the following formula (6) are mixed in a solvent in a catalyst. Precursor (precursor (hereinafter referred to as “precursor (1-4)”) in which q is 0 in general formula (1-4) by dehydration condensation for 12 to 50 hours at 60 to 90 ° C. in the presence. Sometimes get :)). As said catalyst, an acid catalyst etc. can be mentioned, for example. Conditions (methods) for introducing an organic group having a 1,2-naphthoquinonediazide group into the precursor (1-4) are as described above.

  The compound represented by the above formula (5) (hereinafter may be referred to as “compound (5)”) and the compound represented by the above formula (6) (hereinafter referred to as “compound (6)”). The mixing ratio (molar ratio) is not particularly limited, but from the viewpoint of increasing the yield of the compound of the present embodiment to be obtained, the compound (5) is added to 1.00 mol of the compound (6). Is preferably 1.00 to 8.00 mol, more preferably 2.00 to 6.00 mol, and particularly preferably 3.00 to 5.00 mol. There exists a possibility that the yield of the precursor (1-4) obtained as the mixing ratio of a compound (5) is less than 1.00 may fall. On the other hand, if it exceeds 8.00, the yield of the resulting precursor (1-4) may be reduced.

  The substrate concentration in the reaction solution (the total concentration of the compound (5) and the compound (6)) is not particularly limited, but from the viewpoint of increasing the yield of the obtained precursor (1-4), 2 mol / It is preferably L or more, more preferably 4 mol / L or more, and particularly preferably 4 to 10 mol / L. There exists a possibility that the yield of the obtained precursor (1-4) may fall that a substrate concentration is less than 2 mol / L.

In the present invention, the sensitivity of the radiation-sensitive composition can be further improved by using another 1,2-quinonediazide compound together with the compound (B). Examples of other 1,2-quinonediazide compounds include phenolic compounds or alcoholic compounds (hereinafter referred to as “mother nucleus”) other than the compounds represented by the formula (1-4), and 1, A condensate of 2-naphthoquinonediazide sulfonic acid halide can be used.
Examples of the mother nucleus include trihydroxybenzophenone, tetrahydroxybenzophenone, pentahydroxybenzophenone, hexahydroxybenzophenone, (polyhydroxyphenyl) alkane, and other mother nuclei.

Specific examples thereof include trihydroxybenzophenone such as 2,3,4-trihydroxybenzophenone and 2,4,6-trihydroxybenzophenone;
As tetrahydroxybenzophenone, 2,2 ′, 4,4′-tetrahydroxybenzophenone, 2,3,4,3′-tetrahydroxybenzophenone, 2,3,4,4′-tetrahydroxybenzophenone, 2,3,4 2,2'-tetrahydroxy-4'-methylbenzophenone, 2,3,4,4'-tetrahydroxy-3'-methoxybenzophenone, etc .;
Examples of pentahydroxybenzophenone include 2,3,4,2 ′, 6′-pentahydroxybenzophenone and the like;
Examples of hexahydroxybenzophenone include 2,4,6,3 ′, 4 ′, 5′-hexahydroxybenzophenone, 3,4,5,3 ′, 4 ′, 5′-hexahydroxybenzophenone and the like;
Examples of (polyhydroxyphenyl) alkanes include bis (2,4-dihydroxyphenyl) methane, bis (p-hydroxyphenyl) methane, tri (p-hydroxyphenyl) methane, and 1,1,1-tri (p-hydroxyphenyl). ) Ethane, bis (2,3,4-trihydroxyphenyl) methane, 2,2-bis (2,3,4-trihydroxyphenyl) propane, 1,1,3-tris (2,5-dimethyl-4) -Hydroxyphenyl) -3-phenylpropane, 4,4 '-[1- [4- [1- [4-hydroxyphenyl] -1-methylethyl] phenyl] ethylidene] bisphenol, bis (2,5-dimethyl- 4-hydroxyphenyl) -2-hydroxyphenylmethane, 3,3,3 ′, 3′-tetramethyl-1,1′-spirobiindene-5 6,7,5 ′, 6 ′, 7′-hexanol, 2,2,4-trimethyl-7,2 ′, 4′-trihydroxyflavan and the like;

As other mother nucleus, for example, 2-methyl-2- (2,4-dihydroxyphenyl) -4- (4-hydroxyphenyl) -7-hydroxychroman, 2- [bis {(5-isopropyl-4-hydroxy- 2-methyl) phenyl} methyl], 1- [1- (3- {1- (4-hydroxyphenyl) -1-methylethyl} -4,6-dihydroxyphenyl) -1-methylethyl] -3- ( 1- (3- {1- (4-hydroxyphenyl) -1-methylethyl} -4,6-dihydroxyphenyl) -1-methylethyl) benzene, 4,6-bis {1- (4-hydroxyphenyl) -1-methylethyl} -1,3-dihydroxybenzene.
Further, 1,2-naphthoquinone diazide sulfonic acid amides in which the ester bond of the mother nucleus exemplified above is changed to an amide bond, for example, 2,3,4-trihydroxybenzophenone-1,2-naphthoquinone diazide-4-sulfonic acid amide Etc. are also preferably used.

  Among these mother nuclei, 2,3,4,4′-tetrahydroxybenzophenone, 1,1,1-tri (p-hydroxyphenyl) methane, 1,1,1-tri (p-hydroxyphenyl) ethane, 4,4 ′-[1- [4- [1- [4-hydroxyphenyl] -1-methylethyl] phenyl] ethylidene] bisphenol is preferred.

The 1,2-naphthoquinone diazide sulfonic acid halide is preferably 1,2-naphthoquinone diazide sulfonic acid chloride. Specific examples thereof include 1,2-naphthoquinone diazide-4-sulfonic acid chloride and 1,2-naphthoquinone diazide. -5-sulfonic acid chloride can be mentioned, and among these, 1,2-naphthoquinonediazide-5-sulfonic acid chloride is preferably used.
In the condensation reaction, 1,2-naphthoquinonediazide sulfonic acid halide corresponding to 30 to 85 mol%, more preferably 50 to 70 mol% is used with respect to the number of OH groups in the phenolic compound or alcoholic compound. be able to.
The condensation reaction can be carried out by a known method.
These [B] components can be used alone or in combination of two or more.

  [B] The usage-amount of a component becomes like this. Preferably it is 5-100 weight part with respect to 100 weight part of copolymers [A], More preferably, it is 10-50 weight part. When this ratio is less than 5 parts by weight, the difference in solubility between the irradiated portion and the unirradiated portion in the alkali developer is small, and patterning may be difficult, and the resulting interlayer insulating film or microlens May have insufficient heat resistance and solvent resistance. On the other hand, when this ratio exceeds 100 parts by weight, the solubility in the alkaline aqueous solution may be insufficient in the radiation irradiated portion, and development may be difficult.

  Moreover, when using together a compound (B) and another 1, 2- quinonediazide compound, the usage-amount of the compound (B) in [B] component becomes like this. Preferably it is 5-70 weight%, More preferably, it is 10-60 weight %. By using the compound (B) at such a ratio, the difference in solubility between the irradiated portion and the unirradiated portion in the alkali developer is increased, and a more sensitive radiation-sensitive resin composition can be obtained. it can.

Other Components The radiation-sensitive resin composition of the present invention contains the above-mentioned copolymer [A] and [B] components as essential components, but [C] a thermosensitive acid-generating compound, [ D] A polymerizable compound having at least one ethylenically unsaturated double bond, an epoxy resin other than [E] copolymer [A], [F] a surfactant, or [G] an adhesion assistant. be able to.
[C] The heat-sensitive acid generating compound can be used to improve heat resistance and hardness. Specific examples thereof include known onium salts such as sulfonium salts, benzothiazonium salts, ammonium salts, and phosphonium salts.
The proportion of component [C] used is preferably 20 parts by weight or less, more preferably 5 parts by weight or less with respect to 100 parts by weight of copolymer [A]. When the amount used exceeds 20 parts by weight, precipitates may be deposited in the coating film forming step, which may hinder the coating film formation.
Examples of the polymerizable compound having at least one ethylenically unsaturated double bond as the component [D] include monofunctional (meth) acrylate, bifunctional (meth) acrylate, and trifunctional or higher (meth) acrylate. Preferably, it can be mentioned.
Of these, trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, and dipentaerythritol hexa (meth) acrylate are particularly preferable.

The proportion of the component [D] used is preferably 50 parts by weight or less, more preferably 30 parts by weight or less with respect to 100 parts by weight of the copolymer [A].
By including the component [D] at such a ratio, the heat resistance and surface hardness of the interlayer insulating film or microlens obtained from the radiation-sensitive resin composition of the present invention can be improved. When the amount used exceeds 50 parts by weight, film roughening may occur in the step of forming a coating film of the radiation sensitive resin composition on the substrate.
The epoxy resin other than the copolymer [A] as the [E] component is not limited as long as the compatibility is not affected. Preferably, bisphenol A type epoxy resin, phenol novolak type epoxy resin, cresol novolak type epoxy resin, cyclic aliphatic epoxy resin, glycidyl ester type epoxy resin, glycidyl amine type epoxy resin, heterocyclic epoxy resin, glycidyl methacrylate ) Polymerized resins and the like can be mentioned. Of these, bisphenol A type epoxy resins, cresol novolac type epoxy resins, glycidyl ester type epoxy resins and the like are particularly preferable.

[E] The usage-amount of a component becomes like this. Preferably it is 30 weight part or less with respect to 100 weight part of copolymers [A]. By containing the component [E] at such a ratio, the heat resistance and surface hardness of the protective film or insulating film obtained from the radiation-sensitive resin composition of the present invention can be further improved. When this ratio exceeds 30 parts by weight, the film thickness uniformity of the coating film may be insufficient when a coating film of the radiation sensitive resin composition is formed on the substrate.
The copolymer [A] can also be referred to as an “epoxy resin”, but differs from the component [E] in that it has alkali solubility. [E] component is alkali-insoluble.

In the radiation sensitive resin composition of the present invention, a surfactant which is the above-mentioned [F] component can be used to further improve the coating property. As the [F] surfactant that can be used here, fluorine-based surfactants, silicone-based surfactants, and nonionic surfactants can be suitably used.
Specific examples of the fluorosurfactant include 1,1,2,2-tetrafluorooctyl (1,1,2,2-tetrafluoropropyl) ether, 1,1,2,2-tetrafluorooctylhexyl ether. , Octaethylene glycol di (1,1,2,2-tetrafluorobutyl) ether, hexaethylene glycol (1,1,2,2,3,3-hexafluoropentyl) ether, octapropylene glycol di (1,1 , 2,2-tetrafluorobutyl) ether, hexapropylene glycol di (1,1,2,2,3,3-hexafluoropentyl) ether, sodium perfluorododecyl sulfonate, 1,1,2,2,8 , 8,9,9,10,10-decafluorododecane, 1,1,2,2,3,3-hexafluorodecane, etc. Sodium sulfonates; fluoroalkyloxyethylene ethers; fluoroalkylammonium iodides, fluoroalkylpolyoxyethylene ethers, perfluoroalkylpolyoxyethanols; perfluoroalkylalkoxylates; fluorinated alkyl esters be able to. These commercial products include BM-1000, BM-1100 (manufactured by BM Chemie), MegaFuck F142D, F172, F173, F183, F178, F191, F191 (and above, Dainippon Ink). Chemical Industries, Ltd.), Fluorad FC-170C, FC-171, FC-430, FC-431 (above, manufactured by Sumitomo 3M), Surflon S-112, S-113, S-131, S-141, S-145, S-382, SC-101, SC-102, SC-103, SC-104, SC-105, SC-106 (manufactured by Asahi Glass Co., Ltd.) ), F-top EF301, 303, and 352 (manufactured by Shin-Akita Kasei Co., Ltd.).
Examples of the silicone surfactant include DC3PA, DC7PA, FS-1265, SF-8428, SH11PA, SH21PA, SH28PA, SH29PA, SH30PA, SH-190, SH-193, SZ-6032 (above, Toray Dow Corning) -Silicone Co., Ltd.), TSF-4440, TSF-4300, TSF-4445, TSF-4446, TSF-4460, TSF-4442 (above, GE Toshiba Silicone Co., Ltd.) are commercially available. You can list what you have.
Examples of the nonionic surfactant include polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, and polyoxyethylene oleyl ether; polyoxyethylene octyl phenyl ether, polyoxyethylene nonyl phenyl ether Polyoxyethylene aryl ethers such as polyoxyethylene dilaurate, polyoxyethylene dialkyl esters such as polyoxyethylene distearate, etc .; (meth) acrylic acid copolymer polyflow Nos. 57 and 95 (Kyoeisha Chemical Co., Ltd.) ))) Can be used.
These surfactants can be used alone or in combination of two or more.
These [F] surfactants are preferably used in an amount of 5 parts by weight or less, more preferably 2 parts by weight or less based on 100 parts by weight of the copolymer [A]. [F] When the amount of the surfactant used exceeds 5 parts by weight, the coating film may be easily formed when the coating film is formed on the substrate.

  In the radiation sensitive resin composition of the present invention, an adhesion assistant as the [G] component can also be used in order to improve the adhesion to the substrate. As such [G] adhesion assistant, a functional silane coupling agent is preferably used, and examples thereof include a silane coupling agent having a reactive substituent such as a carboxyl group, a methacryloyl group, an isocyanate group, and an epoxy group. . Specifically, trimethoxysilylbenzoic acid, γ-methacryloxypropyltrimethoxysilane, vinyltriacetoxysilane, vinyltrimethoxysilane, γ-isocyanatopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane and the like. Such [G] adhesion assistant is preferably used in an amount of 20 parts by weight or less, more preferably 10 parts by weight or less, based on 100 parts by weight of the copolymer [A]. In the case where the amount of the adhesion assistant exceeds 20 parts by weight, there may be a case where development residue is likely to occur in the development process.

Radiation-sensitive resin composition The radiation-sensitive resin composition of the present invention is prepared by uniformly mixing the above-mentioned copolymer [A] and [B] components and other components optionally added as described above. Is done. Usually, the radiation-sensitive resin composition of the present invention is preferably used in a solution state after being dissolved in an appropriate solvent. For example, the radiation sensitive resin composition in a solution state can be prepared by mixing the copolymer [A] and [B] components and other optionally added components in a predetermined ratio.
As a solvent used for the preparation of the radiation sensitive resin composition of the present invention, each component of the copolymer [A] and [B] components and other components optionally blended is uniformly dissolved, and each component Those that do not react with.

As such a solvent, the thing similar to what was illustrated as a solvent which can be used in order to manufacture copolymer [A] mentioned above can be mentioned.
Among such solvents, alcohol, glycol ether, ethylene glycol alkyl ether acetate, ester and diethylene glycol are preferably used from the viewpoints of solubility of each component, reactivity with each component, ease of film formation, and the like. . Among these, benzyl alcohol, 2-phenylethyl alcohol, 3-phenyl-1-propanol, ethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol diethyl ether, diethylene glycol ethyl methyl ether, diethylene glycol dimethyl ether, propylene glycol monomethyl ether, Purpylene glycol monomethyl ether acetate, methyl methoxypropionate, and ethyl ethoxypropionate can be particularly preferably used.
Furthermore, in order to improve the in-plane uniformity of the film thickness together with the solvent, a high boiling point solvent can be used in combination. Examples of the high boiling point solvent that can be used in combination include N-methylformamide, N, N-dimethylformamide, N-methylformanilide, N-methylacetamide, N, N-dimethylacetamide, N-methylpyrrolidone, dimethylsulfoxide, and benzylethyl ether. , Dihexyl ether, acetonyl acetone, isophorone, caproic acid, caprylic acid, 1-octanol, 1-nonanol, benzyl acetate, ethyl benzoate, diethyl oxalate, diethyl maleate, γ-butyrolactone, ethylene carbonate, propylene carbonate, phenyl Examples include cellosolve acetate. Of these, N-methylpyrrolidone, γ-butyrolactone, and N, N-dimethylacetamide are preferable.
When a high boiling point solvent is used in combination as the solvent of the radiation sensitive resin composition of the present invention, the amount used is 50% by weight or less, preferably 40% by weight or less, more preferably 30% by weight or less, based on the total amount of the solvent. can do. If the amount of the high-boiling solvent used exceeds this amount, the coating film thickness uniformity, sensitivity, and residual film rate may decrease.
When the radiation-sensitive resin composition of the present invention is prepared in a solution state, components other than the solvent in the solution (that is, the total of the copolymer [A] and [B] components and other components optionally added) The ratio of (amount) can be arbitrarily set according to the purpose of use, the value of the desired film thickness, etc., but is preferably 5 to 50% by weight, more preferably 10 to 40% by weight, and still more preferably 15 to 35% by weight.
The composition solution thus prepared can be used after being filtered using a Millipore filter having a pore size of about 0.2 μm.

Production of Interlayer Insulating Film and Microlens Next, a method for producing the interlayer insulating film and microlens of the present invention using the radiation sensitive resin composition of the present invention will be described. The method for manufacturing an interlayer insulating film or microlens of the present invention includes the following steps in the order described below.
(1) The process of forming the coating film of the radiation sensitive composition of this invention on a board | substrate,
(2) A step of irradiating at least a part of the coating film with radiation,
(3) Development step, and (4) Heating step.

(1) Step of forming a coating film of the radiation-sensitive composition of the present invention on a substrate In the step (1), the composition solution of the present invention is applied to the substrate surface, preferably by pre-baking. The solvent is removed to form a coating film of the radiation sensitive resin composition.
Examples of the types of substrates that can be used include glass substrates, silicon wafers, and substrates on which various metals are formed.
The method of applying the composition solution is not particularly limited, and an appropriate method such as a spray method, a roll coating method, a spin coating method (spin coating method), a slit die coating method, a bar coating method, an ink jet method, or the like is employed. In particular, a spin coating method and a slit die coating method are preferable. Prebaking conditions vary depending on the type of each component, the proportion of use, and the like. For example, it can be set at 60 to 110 ° C. for about 30 seconds to 15 minutes.
The film thickness of the coating film to be formed is, for example, 3 to 6 μm when the interlayer insulating film is formed, and 0.5 to 3 μm, for example, when the microlens is formed, as the value after pre-baking. preferable.

(2) Step of irradiating at least a part of the coating film In the step (2), the developer is irradiated with radiation through a mask having a predetermined pattern on the formed coating film. The patterning is performed by removing the irradiated portion using the development process. Examples of the radiation used at this time include ultraviolet rays, far ultraviolet rays, X-rays, and charged particle beams.
Examples of the ultraviolet rays include g-line (wavelength 436 nm), i-line (wavelength 365 nm), and the like. Examples of the far ultraviolet light include KrF excimer laser. Examples of X-rays include synchrotron radiation. Examples of the charged particle beam include an electron beam.
Among these, ultraviolet rays are preferable, and radiation containing g-line and / or i-line is particularly preferable.
The exposure amount, 50~1,500J / ^{m 2} In the case of forming an interlayer insulating film, in the case of forming a micro-lens is preferably set to 50~2,000J / ^{m 2.} According to the radiation sensitive resin composition of the present invention, when an interlayer insulating film is formed, an exposure amount of 700 J / m ² or less is 1,500 J when a microlens is formed. A pattern can be formed even with an exposure amount of / m ² or less.

(3) Development process Examples of the developer used in the development process include sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, ammonia, ethylamine, n-propylamine, diethylamine, diethylaminoethanol, di-acid. N-propylamine, triethylamine, methyldiethylamine, dimethylethanolamine, triethanolamine, tetramethylammonium hydroxide, tetraethylammonium hydroxide, pyrrole, piperidine, 1,8-diazabicyclo [5,4,0] -7-undecene An aqueous solution of an alkali (basic compound) such as 1,5-diazabicyclo [4,3,0] -5-nonane can be used. In addition, an aqueous solution obtained by adding an appropriate amount of a water-soluble organic solvent such as methanol or ethanol or a surfactant to the aqueous alkali solution described above, or various organic solvents that dissolve the composition of the present invention can be used as a developing solution. Furthermore, as a developing method, for example, an appropriate method such as a liquid piling method, a dipping method, a rocking dipping method, a shower method, or the like can be used. The development time at this time varies depending on the composition of the composition, but can be, for example, 30 to 120 seconds.

(4) Heating step (3) Performed as described above (3) After the development step, the patterned thin film is preferably rinsed, for example, by washing with running water, and more preferably irradiated with radiation from a high-pressure mercury lamp or the like. (After post-exposure), the 1,2-quinonediadito compound remaining in the thin film is decomposed, and then the thin film is heated (post-baked) with a heating device such as a hot plate or an oven. Then, the thin film is cured. The exposure amount in the post-exposure step is preferably about 2,000 to 5,000 J / m ² . Moreover, the baking temperature in this hardening process is 120-250 degreeC, for example. Although heating time changes with kinds of heating apparatus, for example, when performing heat processing on a hotplate, it can be set to 30 to 90 minutes when performing heat processing in oven, for example. At this time, a step baking method or the like in which a heating process is performed twice or more can also be used.
In this manner, a patterned thin film corresponding to the target interlayer insulating film or microlens can be formed on the surface of the substrate.
The interlayer insulating film and the microlens manufactured as described above are excellent in adhesion, heat resistance, solvent resistance, transparency, and the like, as will be apparent from examples described later.

Interlayer Insulating Film The interlayer insulating film of the present invention produced as described above has good adhesion to the substrate, excellent solvent resistance and heat resistance, high transmittance, and low dielectric constant. Therefore, it can be suitably used as an interlayer insulating film of electronic parts.

Microlens of the present invention produced as described above has good adhesion to a substrate, excellent solvent resistance and heat resistance, and has high transmittance and good melt shape. It can be suitably used as a microlens for a solid-state imaging device.
The shape of the microlens of the present invention is a semi-convex lens shape as shown in FIG.

Synthesis Examples, Examples and Comparative Examples are shown below to describe the present invention more specifically. However, the present invention is not limited to the following examples.
Synthesis example of copolymer [A] Synthesis example 1
A flask equipped with a condenser and a stirrer was charged with 7 parts by weight of 2,2′-azobis (2,4-dimethylvaleronitrile) and 200 parts by weight of diethylene glycol ethyl methyl ether. Subsequently, 16 parts by weight of methacrylic acid, 16 parts by weight of tricyclo [5.2.1.0 ^2,6 ] decan-8-yl methacrylate, 20 parts by weight of 2-methylcyclohexyl acrylate, 40 parts by weight of glycidyl methacrylate, 10 parts by weight of styrene After 3 parts by weight of α-methylstyrene dimer was charged and purged with nitrogen, stirring was started gently. The temperature of the solution was raised to 70 ° C., and this temperature was maintained for 4 hours to obtain a polymer solution containing the copolymer [A-1].
The copolymer [A-1] had a polystyrene equivalent weight average molecular weight (Mw) of 8,000 and a molecular weight distribution (Mw / Mn) of 2.3. The solid content concentration of the polymer solution obtained here was 34.4% by weight.

Synthesis example 2
A flask equipped with a condenser and a stirrer was charged with 8 parts by weight of 2,2′-azobis (2,4-dimethylvaleronitrile) and 220 parts by weight of diethylene glycol ethyl methyl ether. Subsequently, 11 parts by weight of methacrylic acid, 12 parts by weight of tetrahydrofurfuryl methacrylate, 40 parts by weight of glycidyl methacrylate, 15 parts by weight of N-cyclohexylmaleimide, 10 parts by weight of lauryl methacrylate, 10 parts by weight of α-methyl-p-hydroxystyrene, and α -After 3 parts by weight of methylstyrene dimer was charged and purged with nitrogen, stirring was started gently. The temperature of the solution was raised to 70 ° C., and this temperature was maintained for 5 hours to obtain a polymer solution containing the copolymer [A-2].
The copolymer [A-2] had a polystyrene equivalent weight average molecular weight (Mw) of 8,000 and a molecular weight distribution (Mw / Mn) of 2.3. Moreover, the solid content concentration of the polymer solution obtained here was 31.9% by weight.

Synthesis example 3
A flask equipped with a condenser and a stirrer was charged with 8 parts by weight of 2,2′-azobis (2,4-dimethylvaleronitrile) and 220 parts by weight of diethylene glycol ethyl methyl ether. Subsequently, 10 parts by weight of styrene, 20 parts by weight of methacrylic acid, 40 parts by weight of glycidyl methacrylate, 10 parts by weight of (3-ethyloxetane-3-yl) methacrylate and tricyclo [5.2.1.0 ^2,6 ] decane-8. -After 20 parts by weight of yl methacrylate was charged and purged with nitrogen, stirring was started gently. The temperature of the solution was raised to 70 ° C., and this temperature was maintained for 5 hours to obtain a polymer solution containing the copolymer [A-3].
The copolymer [A-3] had a polystyrene equivalent weight average molecular weight (Mw) of 7,900 and a molecular weight distribution (Mw / Mn) of 2.4. The solid content concentration of the polymer solution obtained here was 31.6% by weight.

Synthesis example 4
A flask equipped with a condenser and a stirrer was charged with 8 parts by weight of 2,2′-azobis (2,4-dimethylvaleronitrile) and 220 parts by weight of diethylene glycol ethyl methyl ether. Subsequently, 5 parts by weight of styrene, 16 parts by weight of methacrylic acid, 40 parts by weight of glycidyl methacrylate, and 10 parts by weight of N- (4-hydroxyphenyl) methacrylamide were charged with nitrogen, and then 5 parts by weight of 1,3-butadiene was added. Then, the stirring was started gently. The temperature of the solution was raised to 70 ° C., and this temperature was maintained for 5 hours to obtain a polymer solution containing the copolymer [A-4].
The copolymer [A-4] had a polystyrene equivalent weight average molecular weight (Mw) of 7,900 and a molecular weight distribution (Mw / Mn) of 2.4. Further, the solid content concentration of the polymer solution obtained here was 31.5% by weight.

Synthesis example of compound (B) The following compound (B-1) was synthesized.
Synthesis example 5
Resorcinol (22.0 g, 200 mmol) was dissolved in ethanol (45 mL) and hydrochloric acid (15 mL) was added. This solution was ice-cooled to 5 ° C. while stirring, and 10.0 g (50 mmol) of a 50% aqueous solution of glutaraldehyde was slowly added dropwise. Then, it heated at 80 degreeC for 48 hours, and the cloudy yellow solution was obtained. The suspension was poured into methanol and filtered to obtain a precipitate. Thereafter, the obtained precipitate was washed with methanol three times. The washed precipitate was dried under reduced pressure at room temperature for 24 hours to obtain a powdery pale yellow solid (n) (yield: 11.2 g (yield: 79%)).

The structure of the obtained pale yellow solid (n) was confirmed by MALDI-TOF-MS (model number SHIMAZU / KRATOS matrix-assisted laser ionization time-of-flight mass spectrometer KOMPACT MALDI IV tDE, manufactured by Shimadzu Corporation), IR (model number FT- IR 420 type, manufactured by JASCO Corporation), and ¹ H-NMR (model number JNM-ECA-500 type, manufactured by JEOL Ltd.). These results are shown below.

  MALDI-TOF-MS: It was shown that only a compound with a molecular weight of 1705 was obtained.

IR (film method): (cm ⁻¹ )
3406 (ν _OH ); 2931 (ν _C—H ); 1621, 1505, 1436 (ν _{C = C (aromatic)} )

¹ H-NMR (500 MHz, solvent DMSO-d ₆ , internal standard TMS): δ (ppm) = 0.86 to 2.35 (b, 12.0 H), 3.98 to 4.22 (m, 4. 0H), 6.09-7.42 (m, 8.0H), 8.65-9.56 (m, 8.0H)

After adding 35.0 g (20.5 mmol, OH equivalent 492 mmol) of the obtained pale yellow solid (n) to 100 g of dioxane, 7.5 g (40.5 mmol) of 1,2-naphthoquinonediazide-5-sulfonic acid chloride was added. Charged and dissolved with stirring. Next, the flask was immersed in a water bath controlled at 30 ° C. When the internal temperature became constant at 30 ° C., 2.3 g (42.0 mmol) of triethylamine was added to the solution so that the internal temperature did not exceed 35 ° C. The solution was slowly dropped using a dropping funnel. Thereafter, the precipitated triethylamine hydrochloride was removed by filtration, and the filtrate was poured into a large amount of diluted hydrochloric acid to precipitate it. Next, the precipitate was filtered and dried for a whole day and night with a heating vacuum dryer controlled at 40 ° C. to obtain a compound (B-1).

Example 1
Preparation of radiation-sensitive resin composition 100 parts by weight (in terms of solid content) of copolymer [A-1] as component [A] synthesized in Synthesis Example 1 and compound (B-) as component [B] 1) 20 parts by weight was mixed and dissolved in diethylene glycol ethyl methyl ether so that the solid content concentration was 30% by weight, and then filtered through a membrane filter having a diameter of 0.2 μm to obtain a radiation-sensitive resin composition. Solution (S-1) was prepared.
In Example 1, a solution of the radiation-sensitive resin composition was carried out in the same manner as in Example 1 except that the types and amounts shown in Table 1 were used as the [A] component and the [B] component. (S-2) to (S-12) and (s-1) were prepared.
In Examples 2, 3, 5, 6, 8, and 10, the description of the component [B] represents that two types of 1,2-quinonediazide compounds were used in combination.

In Table 1, the abbreviations of the components indicate the following compounds.
B-2: 4,4 ′-[1- [4- [1- [4-hydroxyphenyl] -1-methylethyl] phenyl] ethylidene] bisphenol (1.0 mol) and 1,2-naphthoquinonediazide-5 -Condensate B-3 of sulfonic acid chloride (2.0 mol): 2,3,4,4'-tetrahydroxybenzophenone (1.0 mol) and 1,2-naphthoquinonediazide-5-sulfonic acid ester (2 .44 mol)

Examples 13 to 24, Comparative Example 2
<Performance evaluation as interlayer insulation film>
Using the radiation-sensitive resin composition prepared as described above, various characteristics as an interlayer insulating film were evaluated as follows. The results are shown in Table 2.
[Evaluation of sensitivity]
On the silicon substrate, for Examples 18 to 24 and Comparative Example 2, the composition described in Table 2 was applied using a spinner, and then prebaked on a hot plate at 90 ° C. for 2 minutes to obtain a film thickness of 3. A 0 μm coating film was formed. The resulting coating film was exposed to light by changing the exposure time with a PLA-501F exposure machine (extra-high pressure mercury lamp) manufactured by Canon Inc. through a pattern mask having a predetermined pattern, and then listed in Table 2. When using a developer solution having a concentration of tetramethylammonium hydroxide at 25 ° C. and a concentration of 0.4%, 80 seconds when using a developer solution having a concentration of 0.4%, 50 seconds when using a developer solution having a concentration of 2.38% Developed with. The substrate was washed with ultrapure water for 1 minute and dried to form a pattern on the wafer. The amount of exposure required to completely dissolve the 3.0 μm line-and-space (10 to 1) space pattern was measured. This value is shown in Table 2 as sensitivity. It can be said that the sensitivity is good when this value is 1,000 J / m ² or less.

[Evaluation of solvent resistance]
On the recon substrate, Examples 18 to 24 and Comparative Example 2 were coated with the composition shown in Table 2 using a spinner, and then pre-baked on a hot plate at 90 ° C. for 2 minutes to form a coating film. did. The obtained coating film was exposed to a cumulative irradiation amount of 3,000 J / m ² with a PLA-501F exposure machine (extra-high pressure mercury lamp) manufactured by Canon Inc., and this silicon substrate was exposed to 220 in a clean oven. Heated at 0 ° C. for 1 hour to obtain a cured film having a thickness of 3.0 μm. The film thickness (T1) of the obtained cured film was measured. And after immersing the silicon substrate in which this cured film was formed in dimethyl sulfoxide temperature-controlled at 70 degreeC for 20 minutes, the film thickness (t1) of the said cured film was measured, and the film thickness change rate by immersion { | T1-T1 | / T1} × 100 [%] was calculated. The results are shown in Table 2. When this value is 5% or less, the solvent resistance is good.
In the evaluation of solvent resistance, patterning of the film to be formed is unnecessary, so the development process was omitted, and only the coating film forming process, the radiation irradiation process, and the post-baking process were performed for evaluation.

[Evaluation of heat resistance]
A cured film was formed in the same manner as the evaluation of the solvent resistance, and the film thickness (T2) of the obtained cured film was measured. Next, after this cured film substrate was additionally baked in a clean oven at 240 ° C. for 1 hour, the film thickness (t2) of the cured film was measured, and the rate of change in film thickness by additional baking {| t2-T2 | / T2 } × 100 [%] was calculated. The results are shown in Table 2. When this value is 5% or less, the heat resistance is good.

[Evaluation of cured film adhesion]
A cured film is formed in the same manner as the evaluation of the solvent resistance, and an aluminum stat pin (manufactured by QUAD) having a circular adhesive surface with a diameter of 0.27 cm, to which an epoxy resin is applied in advance, is attached to the substrate. The pin was adhered onto the cured film so as to be vertical, and baked at 150 ° C. for 1 hour in a clean oven to cure the epoxy resin. Then, the force at the time of peeling a board | substrate and a cured film was measured by pulling a stat pin using the tensile tester "Motorized Standard SDMS-0201-100SL (made by Imada Manufacturing Co., Ltd.)". Table 2 shows the force values at that time. When this value is 150 N or more, it can be said that the adhesion to the substrate is good.

[Evaluation of transparency]
In the evaluation of the solvent resistance, a cured film was formed on the glass substrate in the same manner except that a glass substrate “Corning 7059 (manufactured by Corning)” was used instead of the silicon substrate. The light transmittance of the glass substrate having this cured film was measured at a wavelength in the range of 400 to 800 nm using a spectrophotometer “150-20 type double beam (manufactured by Hitachi, Ltd.)”. Table 2 shows the values of the minimum light transmittance at that time. When this value is 90% or more, it can be said that the transparency is good.

[Evaluation of relative permittivity]
After applying the composition shown in Table 2 on a polished SUS304 substrate using Examples 18-24 and Comparative Example 2 using a spinner, the film was prebaked on a hot plate at 90 ° C. for 2 minutes. A coating film having a thickness of 3.0 μm was formed. The obtained coating film was exposed with a PLA-501F exposure machine (extra-high pressure mercury lamp) manufactured by Canon Co., Ltd. so that the integrated irradiation amount was 3,000 J / m ^2, and this substrate was 220 ° C. in a clean oven. The cured film was obtained by baking for 1 hour. About this cured film, the Pt / Pd electrode pattern was formed by the vapor deposition method, and the sample for dielectric constant measurement was created. The relative dielectric constant of the substrate was measured at a frequency of 10 kHz by a CV method using an HP16451B electrode manufactured by Yokogawa-Hewlett-Packard Co., Ltd. and an HP4284A precision LCR meter. The results are shown in Table 2. When this value is 3.9 or less, the dielectric constant is good.
In the evaluation of the dielectric constant, since the patterning of the film to be formed is unnecessary, the development process was omitted, and only the coating film forming process, the radiation irradiation process, and the post-baking process were performed for evaluation.

Examples 25-36, Comparative Example 3
<Performance evaluation as a micro lens>
Using the radiation-sensitive resin composition prepared as described above, various characteristics as a microlens were evaluated as follows. The results are shown in Table 3. For the evaluation of solvent resistance, evaluation of heat resistance, and evaluation of transparency, refer to the results of performance evaluation as the interlayer insulating film.

[Evaluation of sensitivity]
On the silicon substrate, the compositions shown in Table 3 were applied using Examples 25-36 and Comparative Example 3 using a spinner, and then prebaked on a hot plate at 90 ° C. for 2 minutes. A 0 μm coating film was formed. The obtained coating film was exposed with a NSR1755i7A reduction projection exposure machine (NA = 0.50, λ = 365 nm) manufactured by Nikon Corporation through a pattern mask having a predetermined pattern, and exposed in Table 3. Development was carried out with a tetramethylammonium hydroxide aqueous solution having the stated concentration at 25 ° C. for 1 minute. It was rinsed with water and dried to form a pattern on the wafer. The exposure time required for the space line width of the 0.8 μm line and space pattern (1 to 1) to be 0.8 μm was measured. This value is shown in Table 3 as sensitivity. It can be said that the sensitivity is good when this value is 2,000 J / m ² or less.

[Formation of microlenses]
For Examples 25 to 36 and Comparative Example 3 on a silicon substrate, the composition described in Table 3 was applied using a spinner, and then prebaked on a hot plate at 90 ° C. for 2 minutes to obtain a film thickness of 2.0 μm. The coating film was formed. The obtained coating film was passed through a pattern mask having 4.0 [mu] m dots and 2.0 [mu] m space pattern with a NSR1755i7A reduction projection exposure machine (NA = 0.50, [lambda] = 365 nm) manufactured by Nikon Corporation. Exposure is performed with an exposure amount corresponding to the sensitivity value measured in [Evaluation of Sensitivity], and 25 ° C. is applied with a tetramethylammonium hydroxide aqueous solution having the concentration described as the developer concentration in the sensitivity evaluation in Table 3. Development was carried out by a liquid pouring method for a minute. It was rinsed with water and dried to form a pattern on the wafer. Then, it exposed so that an integrated irradiation amount might be set to 3,000 J / m < ² > with the PLA-501F exposure machine (extra-high pressure mercury lamp) by Canon. Thereafter, the pattern was melt-flowed by heating at 160 ° C. for 10 minutes on a hot plate and further at 230 ° C. for 10 minutes to form a microlens.
Table 3 shows the size (diameter) and cross-sectional shape of the bottom (surface in contact with the substrate) of the formed microlens. It can be said that the microlens bottom portion is good when it is larger than 4.0 μm and smaller than 5.0 μm. In addition, when this dimension is 5.0 μm or more, the adjacent lenses are in contact with each other, which is not preferable. Further, the cross-sectional shape is good when it is a semi-convex lens shape as shown in (a) in the schematic diagram shown in FIG. 1, and it is bad when it is on a substantially trapezoidal shape as shown in (b).

It is a schematic diagram of the cross-sectional shape of a micro lens.

Claims (6)

[A] (a1) at least one selected from the group consisting of unsaturated carboxylic acids and unsaturated carboxylic acid anhydrides, and (a2) from the group consisting of unsaturated compounds having an oxiranyl group and unsaturated compounds having an oxetanyl group It contains a copolymer of an unsaturated compound containing at least one selected, and [B] a 1,2-quinonediazide compound containing a compound represented by the following general formula (1). A radiation sensitive resin composition.

(In the general formula (1), R is independently an organic group having a hydrogen atom or a 1,2-quinonediazide group, provided that at least one of them is an organic group having a 1,2-quinonediazide group. X is independently a methylene group or a substituted or unsubstituted alkylene group having 2 to 8 carbon atoms, Y is independently a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, 10 substituted or unsubstituted alkenyl groups, substituted or unsubstituted alkynyl groups having 2 to 10 carbon atoms, substituted or unsubstituted aralkyl groups having 7 to 10 carbon atoms, substituted or unsubstituted alkoxy groups having 1 to 10 carbon atoms Or a substituted or unsubstituted phenoxy group, and q is 0 or 1 independently of each other.) The radiation-sensitive resin composition according to claim 1, wherein, in the general formula (1), X is a propylene group and q is 0. The radiation-sensitive resin composition according to claim 1, which is used for producing an interlayer insulating film. The manufacturing method of the interlayer insulation film characterized by including the following processes in order of description below.
(1) The process of forming the coating film of the radiation sensitive composition of Claim 3 on a board | substrate,
(2) A step of irradiating at least a part of the coating film with radiation,
(3) Development step, and (4) Heating step. The radiation-sensitive resin composition according to claim 1 or 2, which is used for producing a microlens. The manufacturing method of the micro lens characterized by including the following processes in order of description below.
(1) The process of forming the coating film of the radiation sensitive composition of Claim 5 on a board | substrate,
(2) A step of irradiating at least a part of the coating film with radiation,
(3) Development step, and (4) Heating step.

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