JP4577507B2 - Resin composition, protective film and method for forming protective film - Google Patents

Description

The present invention, dendritic fat composition, to a method and a protective film to form a protective film from the composition. More specifically, a composition suitable as a material for forming a protective film used in a color filter for a liquid crystal display element (LCD) and a color filter for a charge coupled device (CCD), and formation of a protective film using the composition The present invention relates to a method and a protective film formed from the composition.

Radiation devices such as LCD and CCD are soaked in a display element with a solvent, acid or alkali solution during the manufacturing process, and when the wiring electrode layer is formed by sputtering, the element surface is localized. Exposed to high temperatures. Therefore, in order to prevent the element from being deteriorated or damaged by such treatment, a protective film made of a thin film having resistance to these treatments is provided on the surface of the element.
Such a protective film has high adhesion to the substrate or lower layer on which the protective film is to be formed, and further to the layer formed on the protective film, the film itself is smooth and tough, transparent It has excellent heat resistance and light resistance, does not cause deterioration such as coloring, yellowing, and whitening over a long period of time, and has excellent water resistance, solvent resistance, acid resistance, and alkali resistance. Performance is required. As a material for forming a protective film satisfying these various properties, for example, a thermosetting composition containing a polymer having a glycidyl group is known (see Patent Document 1 and Patent Document 2).

In addition, when such a protective film is used as a protective film for a color liquid crystal display device or a color filter of a charge coupled device, it is generally required that the step formed by the color filter formed on the base substrate can be flattened. The
Further, in a color liquid crystal display device, for example, a STN (Super Twisted Nematic) type or TFT (Thin Film Transistor) type color liquid crystal display element, a bead-like spacer is provided on the protective film in order to uniformly maintain the cell gap of the liquid crystal layer. The panels are pasted together after spraying. After that, the liquid crystal cell is sealed by thermocompression bonding with a sealing material, but the heat and pressure applied at that time show a phenomenon that the protective film in the part where the beads exist is recessed, and the cell gap may be distorted. It is a problem.
In particular, when manufacturing STN color liquid crystal display elements, the accuracy of bonding between the color filter and the counter substrate must be extremely strict, and the protective film has a very high leveling flatness and heat resistance. Performance is required.

  In recent years, a wiring electrode (indium tin oxide: ITO or indium zinc oxide: IZO) is formed on the protective film of the color filter by sputtering, and ITO or IZO is patterned with a strong acid or strong alkali. ing. For this reason, the surface of the color filter protective film is locally exposed to high temperatures during sputtering, and various chemical treatments are performed. Therefore, it is required to withstand these treatments and to adhere to the wiring electrodes so that ITO or IZO does not peel off from the protective film during chemical treatment.

For the formation of such a protective film, it is convenient to use a thermosetting composition having an advantage that a protective film having excellent hardness can be formed by a simple method. The protective film resin composition of the present invention has a reactive crosslinking group or catalyst that forms strong crosslinks, and therefore there is a problem that the shelf life of the composition itself is very short, and handling is very troublesome. Met. That is, not only the coating performance of the composition itself deteriorates with time, but also frequent maintenance and washing of the coating machine are required, and the operation is complicated.
A material that can easily form a protective film that satisfies the above-mentioned general performance requirements as a protective film, such as transparency, and that has excellent storage stability as a composition is still known. Absent.
Patent Document 3 discloses a thermosetting composition containing a latent carboxyl compound used for paints, inks, adhesives, and molded articles, but does not disclose any color filter protective film. Absent.
JP-A-5-78453 JP 2001-91732 A JP-A-4-218561

  The present invention has been made on the basis of the above circumstances, and its object is to form a cured film having high flatness on the substrate even if the substrate has low surface flatness. In addition, it is suitable for forming a protective film for optical devices having high transparency and surface hardness, and excellent resistance to various properties such as heat and pressure resistance, acid resistance, alkali resistance, sputtering resistance and etching resistance. An object of the present invention is to provide a composition that is used and has excellent storage stability as a composition, a method for forming a protective film using the composition, and a protective film formed from the composition.

  According to the present invention, the above object of the present invention is as follows. First, [A-1] (a1) a polymer unit derived from a polymerizable unsaturated compound having an oxiranyl group or an oxetanyl group and (a2) the following formula (01 )

Here, R is a tertiary alkyl group having 5 or more carbon atoms, a tertiary alkyl group having 4 or more carbon atoms substituted with an alkoxy group having 1 to 4 carbon atoms, oxygen bonded to R in the above-described formula A cycloalkyl group having 3 or more ring carbon atoms bonded to the atom (—O—) with a tertiary carbon atom or a tertiary atom to an oxygen atom (—O—) bonded to R in the above-described formula A lactone ring or a lactam ring of 4 or more members bonded by a carbon atom,
In structural Ru copolymer polymer name contains a polymerized unit derived from a polymerizable unsaturated compound having a represented, and
[B] Cationic polymerizable compound
It is achieved by the resin composition characterized by containing .

The above object of the present invention, secondly, the coating film was formed by using each resin composition, and then characterized by heat treatment, the method of forming the protective film of the color filter, it is accomplished by.

Thirdly , the above object of the present invention is achieved by a color filter protective film formed from the above resin composition.
Still other objects and advantages of the present invention will become apparent from the following description.

  According to the present invention, even a substrate having low surface flatness can form a cured film having high flatness on the substrate, and has high transparency and surface hardness, heat resistance and pressure resistance, A resin composition that is suitably used for forming a protective film for optical devices excellent in various resistances such as acid resistance, alkali resistance, sputtering resistance, and etching resistance, and excellent in storage stability as a composition, A method for forming a protective film using the resin composition and a protective film formed from the composition are provided.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, each component of the resin composition of this invention is demonstrated.
Copolymer [A-1]
The copolymer [A-1] of the present invention comprises (a1) a polymer unit derived from a polymerizable unsaturated compound having an oxiranyl group or an oxetanyl group, (a2) the above formula (01)
And (a3) polymerized units derived from a polymerizable unsaturated compound other than the polymerized units of (a1) and (a2).

R in the formula (01) is a tertiary alkyl group having 5 or more carbon atoms, a tertiary alkyl group having 4 or more carbon atoms substituted with an alkoxy group having 1 to 4 carbon atoms, R in the represented formula (01) A cycloalkyl group having 3 or more ring carbon atoms bonded to a bonded oxygen atom (—O—) by a tertiary carbon atom or an oxygen atom bonded to R in the represented formula (01) ( It is a lactone ring or a lactam ring having a 4-membered ring or more which is bonded to -O-) with a tertiary carbon atom.
When R is a tertiary aralkyl key Le group has been having 4 or more carbon atoms substituted with a tertiary alkyl group or an alkoxy group having 1 to 4 carbon atoms or 5 carbon atoms, the formula (01), the following formula (1)

Here, R ¹ and R ² are each independently a C 1-8 alkyl group substituted with a C 1-8 alkyl group or a C 1-4 alkoxyl group, and R ³ Is represented by a C 1-8 alkyl group substituted with a C 2-8 alkyl group or a C 1-4 alkoxy group.
When R is a cycloalkyl group having 3 or more ring carbon atoms, the formula (01) is represented by the following formula (2):

Here, the definition of R ¹ is the same as in the above formula (1), n is an integer of 1 to 8, and R ⁴ , R ⁵ , R ⁶ and R ⁷ are each independently a hydrogen atom, or An alkyl group having 1 to 8 carbon atoms, an alkyl group having 1 to 8 carbon atoms having an alkoxy group having 1 to 4 carbon atoms at the terminal or side chain of the alkyl group, or an alkoxy group having 1 to 4 carbon atoms, Alternatively, R ⁴ , R ⁵ , R ⁶ and R ⁷ are combined with the carbon atom to which at least two are bonded and the carbon atom to which they are bonded and the carbon atom to which R ¹ is bonded to form a total number of carbon atoms of 7 ˜16 dicycloalkane or tricycloalkane structures may be formed. However, when n = 2 to 8, the plurality of R ⁶ and R ⁷ may be the same or different.
It is represented by

  When R is a lactone ring or lactam ring having 4 or more members, the above formula (01) is represented by the following formula (3):

Here, the definition of R ¹ is the same as in the above formula (1), l is 0, 1 or 2, m is an integer of 1 to 4, X is an oxygen atom or a nitrogen atom, and R ⁸ , R ⁹ , R ¹⁰ and R ¹¹ are each independently a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a carbon having an alkoxy group having 1 to 4 carbon atoms at the terminal or side chain of the alkyl group. An alkyl group having 1 to 8 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, provided that two R ⁸ and two R ⁹ when l = 2 and a plurality when m is an integer of 2 to 4 R ¹⁰ and the plurality of R ¹¹ may be the same or different.
It is a structure represented by.

R ¹ in the formula (1), (2) or (3) and R ² in the formula (1) are an alkyl group having 1 to 8 carbon atoms, or a terminal group or a side chain of the alkyl group having 1 to 4 carbon atoms. The C1-C8 alkyl group which has the alkoxy group of this is shown. Examples of the alkyl group having 1 to 8 carbon atoms include methyl, ethyl, (iso) propyl, (iso) butyl, (iso) pentyl, (iso) hexyl, (iso) heptyl, and (iso) octyl. Examples of the alkoxy group having 1 to 4 carbon atoms include methoxy, ethoxy, (iso) propoxy, (iso) butoxy and the like.
R ³ represents an alkyl group having 2 to 8 carbon atoms, or an alkyl group having 1 to 8 carbon atoms having an alkoxy group having 1 to 4 carbon atoms at the terminal or side chain of the alkyl group. Examples of the alkyl group having 2 to 8 carbon atoms include ethyl, (iso) propyl, (iso) butyl, (iso) pentyl, (iso) hexyl, (iso) heptyl, and (iso) octyl. Examples of the alkoxy group having 1 to 4 carbon atoms include methoxy, ethoxy, (iso) propoxy, (iso) butoxy and the like.

The cyclic structure in formula (2) represents a cycloalkane structure of n = 1-8. Examples of the cycloalkane include cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, cyclooctane, cyclononane, and cyclodecane.
R ^{4 to} R ⁷ are a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, an alkyl group having 1 to 8 carbon atoms having an alkoxy group having 1 to 4 carbon atoms at the terminal or side chain of the alkyl group, or the number of carbon atoms 1-4 alkoxy groups are shown. A plurality of R ⁶ and R ⁷ on the cyclic alkane are not necessarily the same when n = 2 or more, but they are not necessarily the same, a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a terminal or side chain of the alkyl group Either an alkyl group having 1 to 8 carbon atoms having an alkoxy group having 1 to 4 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms may be used. Examples of the alkyl group having 1 to 8 carbon atoms include methyl, ethyl, (iso) propyl, (iso) butyl, (iso) pentyl, (iso) hexyl, (iso) heptyl, (iso) octyl and the like. Examples of the alkoxy group having 1 to 4 carbon atoms include methoxy, ethoxy, (iso) propoxy, (iso) butoxy and the like.

R ^{4 to} R ⁷ are dicycloalkanes having a total ring carbon number of 7 to 16 together with the carbon atom to which at least two of them are bonded and the carbon atom to which R ¹ is bonded. Alternatively, a tricycloalkane structure can be formed. Examples of the dichlorolucan or tricycloalkane include 2-ethyltricyclo [3.3.1.1 ^3,7 ] decan-2-yl group, 2-methyltricyclo [3.3.1.1 ^{3, 7} ] Decan-2-yl group, 1-ethyltricyclo [3.3.1.1 ^3,7 ] decan-1-yl group, 1-ethyltricyclo [3.3.1.1 ^3,7 ] Examples include a decan-1-yl group and a 3-hydroxytricyclo [3.3.1.1 ^3,7 ] decan-1-yl group.
As R < ⁸ > -R < ¹¹ > in Formula (3), the same group as the group mentioned above about R < ⁴ > -R < ⁷ > can be illustrated.

  Examples of the lactone ring in the formula (3) when X is an oxygen atom include 2-ethyl-γ-butyrolactone-2-yl group, 2-methyl-γ-butyrolactone-2-yl group, and 2-ethyl- γ-butyrolactone-3-yl group, 2-methyl-γ-butyrolactone-3-yl group, 2-ethyl-γ-butyrolactone-4-yl group, 2-methyl-γ-butyrolactone-4-yl group, 2- Ethyl-δ-valerolactone-2-yl group, 2-ethyl-δ-valerolactone-2-yl group, 2-ethyl-δ-valerolactone-3-yl group, 2-ethyl-δ-valerolactone-3 -Yl group, 2-ethyl-δ-valerolactone-4-yl group, 2-ethyl-δ-valerolactone-4-yl group, 2-ethyl-δ-valerolactone-5-yl group and 2-ethyl- δ-valerolactone A 5-yl group etc. can be mentioned.

  Moreover, as a lactam ring in Formula (3) when X is a nitrogen atom, 2-ethyl-γ-butyrolactam-2-yl group, 2-methyl-γ-butyrolactam-2-yl group, 2-ethyl -Γ-butyrolactam-3-yl group, 2-methyl-γ-butyrolactam-3-yl group, 2-ethyl-γ-butyrolactam-4-yl group, 2-methyl-γ-butyrolactam-4-yl group, 2 -Ethyl-δ-valerolactam-2-yl group, 2-ethyl-δ-valerolactam-2-yl group, 2-ethyl-δ-valerolactam-3-yl group and 2-ethyl-δ-valerolactam- 3-yl group, 2-ethyl-δ-valerolactam-4-yl group, 2-ethyl-δ-valerolactam-4-yl group, 2-ethyl-δ-valerolactam-5-yl group and 2-ethyl -Δ-valerolacta Examples thereof include a mu-5-yl group.

In the copolymer [A-1], the polymerizable unsaturated compound (a1) is not particularly limited as long as it has an oxiranyl group or an oxetanyl group and a polymerizable unsaturated group. For example, a polymerizable unsaturated compound containing an oxiranyl group can be used. Examples of the saturated compound include glycidyl acrylate, glycidyl methacrylate, glycidyl α-ethyl acrylate, glycidyl α-n-propyl acrylate, glycidyl α-n-butyl acrylate, 3,4-epoxybutyl acrylate, methacryl Acid 3,4-epoxybutyl, acrylic acid-6,7-epoxyheptyl, methacrylic acid-6,7-epoxyheptyl, α-ethylacrylic acid-6,7-epoxyheptyl, o-vinylbenzylglycidyl ether, m -Vinyl benzyl glycidyl ether, p-vinyl benzyl glycidyl ether Tel and the like.
Examples of the oxetanyl group-containing polymerizable unsaturated compound include 3-methyl-3- (meth) acryloxymethyloxetane, 3-ethyl-3- (meth) acryloxymethyloxetane and the like.

  Among these, glycidyl methacrylate, methacrylic acid-6,7-epoxyheptyl, o-vinyl benzyl glycidyl ether, m-vinyl benzyl glycidyl ether, p-vinyl benzyl glycidyl ether are copolymerized and the protective film obtained or It is preferably used from the viewpoint of increasing the heat resistance and surface hardness of the insulating film.

  In the copolymer [A-1], the polymerizable unsaturated compound (a2) is not particularly limited as long as it is a polymerizable unsaturated compound having the structure of the above chemical formula (1) or (2). (1) Examples of the polymerizable unsaturated polymer having a structure include 1-dimethyl (iso) propyl (meth) acrylate, 1-dimethyl (iso) butyl (meth) acrylate, and 1-dimethyl (iso) octyl (meth). Acrylate, 1-methyl-1-ethylethyl (meth) acrylate, 1-methyl-1-ethyl (iso) propyl (meth) acrylate, 1-methyl-1-ethyl (iso) butyl (meth) acrylate, 1-methyl- 1-ethyl (iso) octyl acrylate, 1-diethyl (iso) propyl (meth) acrylate, 1-diethyl (iso) butyl (meth) acrylate Rate, 1-diethyl (iso) can be mentioned octyl (meth) acrylate.

Examples of the polymerizable unsaturated polymer having the structure of formula (2) include 1-methylcyclopropane (meth) acrylate, 1-methylcyclobutane (meth) acrylate, 1-methylcyclopentyl (meth) acrylate, and 1-methyl. Cyclohexyl (meth) acrylate, 1-methylcycloheptane (meth) acrylate, 1-methylcyclooctane (meth) acrylate, 1-methylcyclononane (meth) acrylate, 1-ethylcyclodecane (meth) acrylate, 1-ethylcyclo Propane (meth) acrylate, 1-ethylcyclobutane (meth) acrylate, 1-ethylcyclopentyl (meth) acrylate, 1-ethylcyclohexyl (meth) acrylate, 1-ethylcycloheptane (meth) acrylate, 1-ethylcyclo Kutan (meth) acrylate, 1-ethylcyclononane (meth) acrylate, 1-ethylcyclodecane (meth) acrylate, 1- (iso) propylcyclopropane (meth) acrylate, 1- (iso) propylcyclobutane (meth) acrylate 1- (iso) propylcyclopentyl (meth) acrylate, 1- (iso) propylcyclohexyl (meth) acrylate, 1- (iso) propylcycloheptane (meth) acrylate, 1- (iso) propylcyclooctane (meth) acrylate 1- (iso) propylcyclononane (meth) acrylate, 1- (iso) propylcyclodecane (meth) acrylate, 1- (iso) butylcyclopropane (meth) acrylate, 1- (iso) butylcyclobutane (meth) Acrylate, -(Iso) butylcyclopentyl (meth) acrylate, 1- (iso) butylcyclohexyl (meth) acrylate, 1- (iso) butylcycloheptane (meth) acrylate, 1- (iso) butylcyclooctane (meth) acrylate, 1 -(Iso) -butylcyclononane (meth) acrylate, 1- (iso) butylcyclodecanyl (meth) acrylate, 1- (iso) pentylcyclopropanyl (meth) acrylate, 1- (iso) pentylcyclobutanyl (Meth) acrylate, 1- (iso) pentylcyclopentyl (meth) acrylate, 1- (iso) pentylcyclohexyl (meth) acrylate, 1- (iso) pentylcycloheptanyl (meth) acrylate, 1- (iso) pentylcyclo Octanyl (meth) acrylate, 1 -(Iso) pentylcyclononanyl (meth) acrylate, 1- (iso) pentylcyclodecanyl (meth) acrylate,
1- (iso) hexylcyclopropanyl (meth) acrylate, 1- (iso) hexylcyclobutanyl (meth) acrylate, 1- (iso) hexylcyclohexyl (meth) acrylate, 1- (iso) hexylcycloheptanyl ( (Meth) acrylate, 1- (iso) hexylcyclooctanyl (meth) acrylate, 1- (iso) hexylcyclononanyl (meth) acrylate, 1- (iso) hexylcyclodecanyl (meth) acrylate,
1- (iso) heptylcyclopropanyl (meth) acrylate, 1- (iso) heptylcyclobutanyl (meth) acrylate, 1- (iso) heptylcycloheptyl (meth) acrylate, 1- (iso) heptylcycloheptyl ( (Meth) acrylate, 1- (iso) heptylcycloheptanyl (meth) acrylate, 1- (iso) heptylcyclooctanyl (meth) acrylate, 1- (iso) heptylcyclononanyl (meth) acrylate, 1- (iso ) Heptylcyclodecanyl (meth) acrylate,
1- (iso) octylcyclopropanyl (meth) acrylate, 1- (iso) octylcyclobutanyl (meth) acrylate, 1- (iso) octylcyclooctyl (meth) acrylate, 1- (iso) octylcyclooctyl ( (Meth) acrylate, 1- (iso) octylcycloheptanyl (meth) acrylate, 1- (iso) octylcyclooctanyl (meth) acrylate, 1- (iso) octylcyclononanyl (meth) acrylate, 1- (iso ) Octylcyclodecanyl (meth) acrylate,
2-ethyltricyclo [3.3.1.1 ^3,7 ] decan-2-yl- (meth) acrylate, 2-methyltricyclo [3.3.1.1 ^3,7 ] decan-2-yl -(Meth) acrylate, 1-ethyltricyclo [3.3.1.1 ^3,7 ] decan-1-yl- (meth) acrylate, 1-ethyltricyclo [3.3.1.1 ^3,7 ] Decan-1-yl- (meth) acrylate 3-hydroxytricyclo [3.3.1.1 ^3,7 ] decan-1-yl- (meth) acrylate and the like.

  Among these, 1-diethylpropyl (meth) acrylate, 1-ethylcyclopentyl (meth) acrylate, 1-ethylcyclohexyl (meth) acrylate, 1- (iso) propylcyclopentyl (meth) acrylate, 1- (iso) propylcyclohexyl It is preferable to use (meth) acrylate, 1- (iso) butylcyclopentyl (meth) acrylate, 1- (iso) butylcyclohexyl (meth) acrylate, more preferably 1-diethylpropyl (meth) acrylate, 1-ethyl. Cyclopentyl (meth) acrylate and 1-ethylcyclohexyl (meth) acrylate are preferable, and 1-ethylcyclopentyl (meth) acrylate and 1-ethylcyclohexyl (meth) acrylate are particularly preferable. These are preferably used from the viewpoint of enhancing the copolymerization reactivity, the heat resistance and surface hardness of the protective film or insulating film to be obtained.

Examples of the polymerizable unsaturated compound having the structure of formula (3) include 2-ethyl-γ-butyrolactone-2-yl- (meth) acrylate and 2-methyl-γ-butyrolactone-2-yl- (meth). Acrylate, 2-ethyl-γ-butyrolactone-3-yl- (meth) acrylate, 2-methyl-γ-butyrolactone-3-yl- (meth) acrylate, 2-ethyl-γ-butyrolactone-4-yl- (meth) ) Acrylate, 2-methyl-γ-butyrolactone-4-yl- (meth) acrylate, 2-ethyl-δ-valerolactone-2-yl- (meth) acrylate, 2-ethyl-δ-valerolactone-2-yl -(Meth) acrylate, 2-ethyl-δ-valerolactone-3-yl- (meth) acrylate, 2-ethyl-δ-valerolactone-3- Ru- (meth) acrylate, 2-ethyl-δ-valerolactone-4-yl- (meth) acrylate, 2-ethyl-δ-valerolactone-4-yl- (meth) acrylate, 2-ethyl-δ-valero Lactones such as lactone-5-yl- (meth) acrylate and 2-ethyl-δ-valerolactone-5-yl- (meth) acrylate:
2-ethyl-γ-butyrolactam-2-yl- (meth) acrylate, 2-methyl-γ-butyrolactam-2-yl- (meth) acrylate, 2-ethyl-γ-butyrolactam-3-yl- (meth) acrylate 2-methyl-γ-butyrolactam-3-yl- (meth) acrylate, 2-ethyl-γ-butyrolactam-4-yl- (meth) acrylate, 2-methyl-γ-butyrolactam-4-yl- (meth) Acrylate, 2-ethyl-δ-valerolactam-2-yl- (meth) acrylate, 2-ethyl-δ-valerolactam-2-yl- (meth) acrylate, 2-ethyl-δ-valerolactam-3-yl -(Meth) acrylate, 2-ethyl-δ-valerolactam-3-yl- (meth) acrylate, 2-ethyl-δ-valerolactam-4 -Yl- (meth) acrylate, 2-ethyl-δ-valerolactam-4-yl- (meth) acrylate, 2-ethyl-δ-valerolactam-5-yl- (meth) acrylate, 2-ethyl-δ- Mention may be made of lactams such as valerolactam-5-yl- (meth) acrylate.

  In addition to (a1) and (a2), copolymer [A-1] can further contain polymerized units derived from polymerizable unsaturated compounds other than (a3), (a1) and (a2). The polymerizable unsaturated compound (a3) includes, for example, (meth) acrylic acid alkyl ester, (meth) acrylic acid cyclic alkyl ester, methacrylic acid aryl ester, acrylic acid aryl ester, unsaturated dicarboxylic acid diester, and bicyclounsaturated compounds. And maleimide compounds, unsaturated aromatic compounds, conjugated diene compounds, unsaturated monocarboxylic acids, unsaturated dicarboxylic acids, unsaturated dicarboxylic acid anhydrides, and other unsaturated compounds.

Specific examples of these include, for example, hydroxymethyl methacrylate, 2-hydroxyethyl methacrylate, 3-hydroxypropyl methacrylate, 4-hydroxybutyl methacrylate, diethylene glycol monomethacrylate, 2,3-dihydroxypropyl methacrylate, and alkylmethacrylate. -Methacryloxyethylglycoside, 4-hydroxyphenyl methacrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, sec-butyl methacrylate, 2-ethylhexyl methacrylate, isodecyl methacrylate, n-lauryl methacrylate, tridecyl methacrylate, n-stearyl Methacrylate, etc .;
Methyl acrylate, isopropyl acrylate, etc. as alkyl acrylate ester;
As cyclic alkyl esters of methacrylic acid, cyclohexyl methacrylate, 2-methylcyclohexyl methacrylate, tricyclo [5.2.1.0 ^2,6 ] decan-8-yl methacrylate, tricyclo [5.2.1.0 ^2,6 ] decane. -8-yloxyethyl methacrylate, isobornyl methacrylate and the like;
As cyclic alkyl ester of acrylic acid, cyclohexyl acrylate, 2-methylcyclohexyl acrylate, tricyclo [5.2.1.0 ^2,6 ] decan-8-yl acrylate, tricyclo [5.2.1.0 ^2,6 ] decane -8-yloxyethyl acrylate, isobornyl acrylate, etc .;
As methacrylic acid aryl ester, phenyl methacrylate, benzyl methacrylate, etc .;
As acrylic acid aryl ester, phenyl acrylate, benzyl acrylate, etc .;
As unsaturated dicarboxylic acid diesters, diethyl maleate, diethyl fumarate, diethyl itaconate, etc . ;
As bicyclo unsaturated compounds bicyclo [2.2.1] hept-2-ene, 5- methylbicyclo [2.2.1] hept-2-ene, 5- ethylbicyclo [2.2.1] Hept-2-ene, 5-methoxybicyclo [2.2.1] hept-2-ene, 5-ethoxybicyclo [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- (2′-hydroxyethyl) bicyclo [2.2.1] hept-2- Ene, 5,6-dihydroxybicyclo [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 Hydroxy-5-methylbicyclo [2.2.1] hept-2-ene, 5-hydroxy-5-ethylbicyclo [2.2.1] hept-2-ene, 5-hydroxymethyl-5-methylbicyclo [ 2.2.1] hept-2-ene and the like;
As maleimide compounds, phenylmaleimide, cyclohexylmaleimide, benzylmaleimide, N-succinimidyl-3-maleimidobenzoate, N-succinimidyl-4-maleimidobutyrate, N-succinimidyl-6-maleimidocaproate, N-succinimidyl-3- Maleimide propionate, N- (9-acridinyl) maleimide and the like;
Examples of unsaturated aromatic compounds include styrene, α-methylstyrene, m-methylstyrene, p-methylstyrene, vinyltoluene, p-methoxystyrene, and the like;
As conjugated diene compounds, 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene and the like;
As unsaturated monocarboxylic acid, acrylic acid, methacrylic acid, crotonic acid, etc .;
As unsaturated dicarboxylic acid, maleic acid, fumaric acid, citraconic acid, mesaconic acid, itaconic acid and the like;
As unsaturated dicarboxylic acid anhydrides, the anhydrides of the above unsaturated dicarboxylic acids;
Examples of other unsaturated compounds include acrylonitrile, methacrylonitrile, vinyl chloride, vinylidene chloride, acrylamide, methacrylamide, and vinyl acetate.

Of these, styrene, tricyclo [5.2.1.0 ^2,6 ] decan-8-yl methacrylate, p-methoxystyrene, 2-methylcyclohexyl acrylate, 1,3-butadiene, bicyclo [2.2.1. Hept-2-ene, N-cyclohexylmaleimide and the like are preferable from the viewpoints of copolymerization reactivity and heat resistance.
These may be used alone or in combination.

  The copolymer [A-1] is preferably a structural unit derived from a polymerizable unsaturated compound monomer (a1) 5 to 95% by weight, (a2) 5 to 95% by weight, and (a3) 0 to 90%. %, More preferably (a1) 20-80%, (a2) 20-80%, and (a3) 0-60%, most preferably (a1) 30-60%, (a2) 30 -60 wt% and (a3) 10-40 wt%. When the content falls within this range, good planarization performance and heat resistance can be realized.

As a preferable specific example of the copolymer (A-1), for example,
Styrene / 1-diethylpropyl methacrylate / tricyclo [5.2.1.0 ^2,6 ] decan-8-yl methacrylate / glycidyl methacrylate copolymer,
Styrene / 1-diethylpropyl methacrylate / N-phenylmaleimide / glycidyl methacrylate copolymer,
Styrene / 1-diethylpropyl methacrylate / N-cyclohexylmaleimide / glycidyl methacrylate copolymer,
Styrene / 1-ethylcyclohexyl methacrylate / tricyclo [5.2.1.0 ^2,6 ] decane-8-yl / glycidyl methacrylate copolymer,
Styrene / 1-ethylcyclohexyl methacrylate / N-phenylmaleimide / glycidyl methacrylate copolymer,
Styrene / 1-ethylcyclohexyl methacrylate / N-cyclohexylmaleimide / glycidyl methacrylate copolymer,
Styrene / 1-ethylcyclopentyl methacrylate / tricyclomethacrylate [5.2.1.0 ^2,6 ] decan-8-yl / glycidyl methacrylate copolymer,
Styrene / 1-ethylcyclopentyl methacrylate / N-phenylmaleimide / glycidyl methacrylate copolymer,
Styrene / 1-ethylcyclopentyl methacrylate / N-cyclohexylmaleimide / glycidyl methacrylate copolymer,
Styrene / 1-diethylpropyl methacrylate / tricyclo [5.2.1.0 ^2,6 ] decane-8-yl / glycidyl methacrylate / methacrylic acid copolymer,
Styrene / 1-diethylpropyl methacrylate / N-phenylmaleimide / glycidyl methacrylate / methacrylic acid copolymer,
Styrene / 1-diethylpropyl methacrylate / N-cyclohexylmaleimide / glycidyl methacrylate / methacrylic acid copolymer,
Styrene / 1-ethylcyclohexyl methacrylate / tricyclo [5.2.1.0 ^2,6 ] decane-8-yl / glycidyl methacrylate / methacrylic acid copolymer,
Styrene / 1-ethylcyclohexyl methacrylate / N-phenylmaleimide / glycidyl methacrylate / methacrylic acid copolymer,
Styrene / 1-ethylcyclohexyl methacrylate / N-cyclohexylmaleimide / glycidyl methacrylate / methacrylic acid copolymer,
Styrene / 1-ethylcyclopentyl methacrylate / tricyclo [5.2.1.0 ^2,6 ] decane-8-yl / glycidyl methacrylate / methacrylic acid copolymer,
Styrene / 1-ethylcyclopentyl methacrylate / N-phenylmaleimide / glycidyl methacrylate / methacrylic acid copolymer,
Examples thereof include styrene / 1-ethylcyclopentyl methacrylate / N-cyclohexylmaleimide / glycidyl methacrylate / methacrylic acid copolymer.

(Co) polymer [A-2]
The (co) polymer [A-2] is a (co) polymer obtained by polymerizing the component containing the polymerizable unsaturated compound (a1) (excluding the above-mentioned copolymer [A-1]). It is.
The (co) polymer [A-2] can be made into a copolymer with the polymerizable unsaturated compound (a3) in addition to the polymerizable unsaturated compound (a1).
The (co) polymer [A-2] is preferably a structural unit derived from a polymerizable unsaturated compound monomer (a1) 5 to 100% by weight, and (a3) 0 to 95% by weight, more preferably ( a1) 20 to 100% by weight, and (a3) 0 to 80% by weight, most preferably (a1) 30 to 90% by weight, and (a3) 10 to 70% by weight. When the content falls within this range, good planarization performance and heat resistance can be realized.

As a preferable specific example of the copolymer [A-2], for example,
Styrene / 1-diethylpropyl methacrylate / tricyclo [5.2.1.0 ^2,6 ] decan-8-yl / methacrylic acid copolymer,
Styrene / 1-diethylpropyl methacrylate / N-phenylmaleimide / methacrylic acid copolymer,
Styrene / 1-diethylpropyl methacrylate / N-cyclohexylmaleimide / methacrylic acid copolymer,
Styrene / 1-ethylcyclohexyl methacrylate / tricyclo [5.2.1.0 ^2,6 ] decane-8-yl / methacrylic acid copolymer,
Styrene / 1-ethylcyclohexyl methacrylate / N-phenylmaleimide / methacrylic acid copolymer,
Styrene / 1-ethylcyclohexyl methacrylate / N-cyclohexylmaleimide / methacrylic acid copolymer,
Styrene / 1-ethylcyclopentyl methacrylate / tricyclo [5.2.1.0 ^2,6 ] decane-8-yl / methacrylic acid copolymer,
Styrene / 1-ethylcyclopentyl methacrylate / N-phenylmaleimide / methacrylic acid copolymer,
Examples thereof include styrene / 1-ethylcyclopentyl methacrylate / N-cyclohexylmaleimide / methacrylic acid copolymer.

(Co) polymer [A-3]
(Co) polymer [A-3] is a (co) polymer obtained by polymerizing the component containing the polymerizable unsaturated compound (a2) (excluding the above-mentioned copolymer [A-1]). It is.
The (co) polymer [A-3] can be made into a copolymer with the polymerizable unsaturated compound (a3) in addition to the polymerizable unsaturated compound (a2).
The (co) polymer [A-3] is preferably a structural unit derived from a polymerizable unsaturated compound monomer (a2) 5 to 100% by weight, and (a3) 0 to 95% by weight, more preferably ( a2) 20 to 100 wt%, and (a3) 0 to 80 wt%, most preferably (a2) 30 to 90 wt%, and (a3) 10 to 70 wt%. When the content falls within this range, good planarization performance and heat resistance can be realized.

As a preferable specific example of the copolymer [A-3], for example,
Styrene / 1-diethylpropyl methacrylate / tricyclo [5.2.1.0 ^2,6 ] decan-8-yl copolymer,
Styrene / 1-diethylpropyl methacrylate / N-phenylmaleimide copolymer,
Styrene / 1-diethylpropyl methacrylate / N-cyclohexylmaleimide copolymer,
Styrene / 1-ethylcyclohexyl methacrylate / tricyclo [5.2.1.0 ^2,6 ] decan-8-yl copolymer,
Styrene / 1-ethylcyclohexyl methacrylate / N-phenylmaleimide copolymer,
Styrene / 1-ethylcyclohexyl methacrylate / N-cyclohexylmaleimide copolymer,
Styrene / 1-ethylcyclopentyl methacrylate / tricyclo [5.2.1.0 ^2,6 ] decan-8-yl copolymer,
Styrene / 1-ethylcyclopentyl methacrylate / N-phenylmaleimide copolymer,
Examples thereof include styrene / 1-ethylcyclopentyl methacrylate / N-cyclohexylmaleimide copolymer.

Copolymers [A-1], [A-2] and [A-3] may be referred to as polystyrene-reduced weight average molecular weight (hereinafter referred to as “Mw”) measured by gel permeation chromatography (elution solvent tetrahydrofuran). .) Is preferably 1,000 to 100,000, more preferably 2,000 to 50,000, and particularly preferably 3,000 to 40,000. In this case, if the Mw is less than 1,000, the coating property of the composition may be insufficient, or the heat resistance of the protective film to be formed may be insufficient. On the other hand, if the Mw exceeds 100,000, the composition may be flat. In some cases, the conversion performance becomes insufficient.
Furthermore, the molecular weight distribution (Mw / Mn) of the copolymers [A-1], [A-2] and [A-3] is preferably 5.0 or less, more preferably 3.0 or less.

  Such a copolymer includes the polymerizable unsaturated compounds (a1) and (a2) in the copolymer [A-1], and the polymerizable unsaturated compound (a-2) in the polymer [A-2]. In the polymer [A-3], the polymerizable unsaturated compound (a2) can be synthesized by a known method such as radical polymerization in the presence of a suitable solvent and a suitable polymerization initiator. .

Cationic polymerizable compound [B]
The cationically polymerizable compound [B] used in the present invention is a compound having two or more oxiranyl groups or oxetanyl groups in the molecule (excluding the above-mentioned copolymers [A-1] [A-2]. ). Examples of the compound having two or more oxiranyl groups or oxetanyl groups in the molecule include compounds having two or more epoxy groups in the molecule, or compounds having 3,4-epoxycyclohexyl groups.

Examples of the compound having two or more epoxy groups in the molecule include bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, bisphenol S diglycidyl ether, hydrogenated bisphenol A diglycidyl ether, and hydrogenated bisphenol F diglycidyl. Diglycidyl ethers of bisphenol compounds such as ether, hydrogenated bisphenol AD diglycidyl ether, brominated bisphenol A diglycidyl ether, brominated bisphenol F diglycidyl ether, brominated bisphenol S diglycidyl ether;
Polyhydric alcohols such as 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, glycerin triglycidyl ether, trimethylolpropane triglycidyl ether, polyethylene glycol diglycidyl ether, and polypropylene glycol diglycidyl ether Glycidyl ethers;
Polyglycidyl ethers of polyether polyols obtained by adding one or more alkylene oxides to aliphatic polyhydric alcohols such as ethylene glycol, propylene glycol and glycerin;
Phenol novolac type epoxy resin;
Cresol novolac type epoxy resin;
Polyphenol type epoxy resin;
Diglycidyl esters of aliphatic long-chain dibasic acids;
Glycidyl esters of higher fatty acids;
Examples include epoxidized soybean oil and epoxidized linseed oil.

Commercially available compounds having two or more epoxy groups in the molecule include, for example, Epicoat 1001, 1002, 1003, 1004, 1007, 1009, 1010, and the like as bisphenol A type epoxy resins. 828 (above, manufactured by Japan Epoxy Resin Co., Ltd.) and the like;
As bisphenol F type epoxy resin, Epicoat 807 (manufactured by Japan Epoxy Resin Co., Ltd.) and the like;
As a phenol novolac type epoxy resin, Epicoat 152, 154, 157S65 (above, manufactured by Japan Epoxy Resin Co., Ltd.), EPPN 201, 202 (above, manufactured by Nippon Kayaku Co., Ltd.), etc .;
As cresol novolac type epoxy resin, EOCN102, 103S, 104S, 1020, 1025, 1027 (above, manufactured by Nippon Kayaku Co., Ltd.), Epicoat 180S75 (manufactured by Japan Epoxy Resin Co., Ltd.) and the like;
As a polyphenol type epoxy resin, Epicoat 1032H60, XY-4000 (above, manufactured by Japan Epoxy Resin Co., Ltd.) and the like;
As cycloaliphatic epoxy resins, CY-175, 177, 179, Araldite CY-182, 192, 184 (above, manufactured by Ciba Specialty Chemicals Co., Ltd.), ERL-4234, 4299, 4221, 4206 ( As described above, manufactured by U.C.C. Co., Ltd., Shodyne 509 (manufactured by Showa Denko KK), Epicron 200, 400 (above, manufactured by Dainippon Ink Co., Ltd.), Epicoat 871, 872 (above, Japan Epoxy) Resin Co., Ltd.), ED-5661, 5562 (above, Celanese Coating Co., Ltd.), etc .;
Examples of the aliphatic polyglycidyl ether include Epolite 100MF (manufactured by Kyoeisha Chemical Co., Ltd.) and Epiol TMP (manufactured by Nippon Oil & Fats Co., Ltd.).

Examples of the compound having two or more 3,4-epoxycyclohexyl groups in the molecule include 3,4-epoxycyclohexylmethyl-3 ′, 4′-epoxycyclohexanecarboxylate, 2- (3,4-epoxy Cyclohexyl-5,5-spiro-3,4-epoxy) cyclohexane-meta-dioxane, bis (3,4-epoxycyclohexylmethyl) adipate, bis (3,4-epoxy-6-methylcyclohexylmethyl) adipate, 3, 4-epoxy-6-methylcyclohexyl-3 ′, 4′-epoxy-6′-methylcyclohexanecarboxylate, methylenebis (3,4-epoxycyclohexane), dicyclopentadiene diepoxide, di (3,4-ethylene glycol) Epoxycyclohexylmethyl) ether, Chirenbisu (3,4-epoxycyclohexane carboxylate), lactone-modified 3,4-epoxycyclohexylmethyl-3 ', may be mentioned 4'-epoxycyclohexane carboxylate.
Of such cationically polymerizable compounds [B], phenol novolac type epoxy resins and polyphenol type epoxy resins are preferred.

  The amount of the cationic polymerizable compound [B] used in the resin composition of the present invention is preferably 3 per 100 parts by weight of the total amount of the polymers [A-1], [A-2] and [A-3]. It is -200 weight part, More preferably, it is 5-100 weight part, Especially 10-50 weight part. When the amount of the cationic polymerizable compound [B] used is more than 200 parts by weight, there may be a problem in the coating property of the composition. On the other hand, when the amount is less than 3 parts by weight, the resulting protective film has insufficient hardness. There is a case.

Thermosensitive acid generator [C]
Examples of the thermal acid generator include sulfonium salts, benzothiazonium salts, ammonium salts, phosphonium salts, etc. Among these, sulfonium salts and benzothiazonium salts are preferably used.

Specific examples of the sulfonium salts include 4-acetophenyldimethylsulfonium hexafluoroantimonate, 4-acetoxyphenyldimethylsulfonium hexafluoroarsenate, dimethyl-4- (benzyloxycarbonyloxy) phenylsulfonium hexafluoroantimonate, dimethyl- Alkylsulfonium salts such as 4- (benzoyloxy) phenylsulfonium hexafluoroantimonate, dimethyl-4- (benzoyloxy) phenylsulfonium hexafluoroarsenate, dimethyl-3-chloro-4-acetoxyphenylsulfonium hexafluoroantimonate;
Benzyl-4-hydroxyphenylmethylsulfonium hexafluoroantimonate, benzyl-4-hydroxyphenylmethylsulfonium hexafluorophosphate, 4-acetoxyphenylbenzylmethylsulfonium hexafluoroantimonate, benzyl-4-methoxyphenylmethylsulfonium hexafluoroantimonate, Such as benzyl-2-methyl-4-hydroxyphenylmethylsulfonium hexafluoroantimonate, benzyl-3-chloro-4-hydroxyphenylmethylsulfonium hexafluoroarsenate, 4-methoxybenzyl-4-hydroxyphenylmethylsulfonium hexafluorophosphate, etc. Benzylsulfonium salt;
Dibenzyl-4-hydroxyphenylsulfonium hexafluoroantimonate, dibenzyl-4-hydroxyphenylsulfonium hexafluorophosphate, 4-acetoxyphenyldibenzylsulfonium hexafluoroantimonate, dibenzyl-4-methoxyphenylsulfonium hexafluoroantimonate, dibenzyl-3 -Chloro-4-hydroxyphenylsulfonium hexafluoroarsenate, dibenzyl-3-methyl-4-hydroxy-5-tert-butylphenylsulfonium hexafluoroantimonate, benzyl-4-methoxybenzyl-4-hydroxyphenylsulfonium hexafluorophosphate Dibenzylsulfonium salts such as;
p-chlorobenzyl-4-hydroxyphenylmethylsulfonium hexafluoroantimonate, p-nitrobenzyl-4-hydroxyphenylmethylsulfonium hexafluoroantimonate, p-chlorobenzyl-4-hydroxyphenylmethylsulfonium hexafluorophosphate, p-nitro Benzyl-3-methyl-4-hydroxyphenylmethylsulfonium hexafluoroantimonate, 3,5-dichlorobenzyl-4-hydroxyphenylmethylsulfonium hexafluoroantimonate, o-chlorobenzyl-3-chloro-4-hydroxyphenylmethylsulfonium Examples thereof include substituted benzylsulfonium salts such as hexafluoroantimonate.

  Among these, 4-acetoxyphenyldimethylsulfonium hexafluoroarsenate, benzyl-4-hydroxyphenylmethylsulfonium hexafluoroantimonate, 4-acetoxyphenylbenzylmethylsulfonium hexafluoroantimonate, dibenzyl-4-hydroxyphenylsulfonium hexafluoroantimonate Nate, 4-acetoxyphenylbenzylsulfonium hexafluoroantimonate and the like are preferably used.

Examples of the benzothiazonium salts include 3-benzylbenzothiazonium hexafluoroantimonate, 3-benzylbenzothiazonium hexafluorophosphate, 3-benzylbenzothiazonium tetrafluoroborate, and 3- (p-methoxybenzyl). Benzylbenzothiazonium salts such as benzothiazonium hexafluoroantimonate, 3-benzyl-2-methylthiobenzothiazonium hexafluoroantimonate, 3-benzyl-5-chlorobenzothiazonium hexafluoroantimonate It is done.
Of these, 3-benzylbenzothiazonium hexafluoroantimonate and the like are preferably used.

Examples of commercially available acid generators that can be suitably used as thermal acid generators include, as alkylsulfonium salts, trade names: Adeka Opton CP-66 and CP-77 manufactured by Asahi Denka Kogyo Co., Ltd.
Moreover, as a benzyl sulfonium salt, the Sanshin Chemical Co., Ltd. product name: SI-60, SI-80, SI-100, SI-110, SI-145, SI-150, SI-80L, SI-100L, SI-110L can be mentioned.
Of these, SI-80, SI-100, and SI-110 are preferred because the resulting protective film has a high surface hardness.

When the resin composition of the present invention contains a [C] heat-sensitive acid generator, the amount used is 100 weights of the total amount of the polymers [A-1], [A-2] and [A-3]. Preferably it is 0.05-20 weight part with respect to part, More preferably, it is 0.1-10 weight part. By setting the amount used in this range, a protective film having sufficient hardness can be obtained.
[C] The heat-sensitive acid generator can be replaced with a radiation-sensitive acid generator.
A radiation-sensitive acid generator is a compound capable of generating an acid upon irradiation with radiation such as visible light, ultraviolet light, far ultraviolet light, electron beam, and X-ray.
Examples of such a radiation sensitive acid generator include diaryl iodonium salts, triaryl sulfonium salts, diaryl phosphonium salts, and the like, which can be preferably used.

  Examples of the diaryliodonium salts include diphenyliodonium tetrafluoroborate, diphenyliodonium hexafluorophosphonate, diphenyliodonium hexafluoroarsenate, diphenyliodonium trifluoromethanesulfonate, diphenyliodonium trifluoroacetate, diphenyliodonium-p-toluenesulfonate, 4 -Methoxyphenylphenyliodonium tetrafluoroborate, 4-methoxyphenylphenyliodonium hexafluorophosphonate, 4-methoxyphenylphenyliodonium hexafluoroarsenate, 4-methoxyphenylphenyliodonium trifluoromethanesulfonate, 4-methoxyphenylphenyliodonium trifluoro Cetate, 4-methoxyphenylphenyl iodonium-p-toluenesulfonate, bis (4-tert-butylphenyl) iodonium tetrafluoroborate, bis (4-tert-butylphenyl) iodonium hexafluoroarsenate, bis (4-tert- Examples thereof include butylphenyl) iodonium trifluoromethanesulfonate, bis (4-tert-butylphenyl) iodonium trifluoroacetate, and bis (4-tert-butylphenyl) iodonium-p-toluenesulfonate. Of these, diphenyliodonium hexafluorophosphonate is preferably used.

Examples of the triarylsulfonium salts include triphenylsulfonium tetrafluoroborate, triphenylsulfonium hexafluorophosphonate, triphenylsulfonium hexafluoroarsenate, triphenylsulfonium trifluoromethanesulfonate, triphenylsulfonium trifluoroacetate, triphenylsulfonium- p-toluenesulfonate, 4-methoxyphenyldiphenylsulfonium tetrafluoroborate, 4-methoxyphenyldiphenylsulfonium hexafluorophosphonate, 4-methoxyphenyldiphenylsulfonium hexafluoroarsenate, 4-methoxyphenyldiphenylsulfonium trifluoromethanesulfonate, 4- Methoxyphenyl diphenyl Rufonium trifluoroacetate, 4-methoxyphenyldiphenylsulfonium-p-toluenesulfonate, 4-phenylthiophenyldiphenyltetrafluoroborate, 4-phenylthiophenyldiphenylhexafluorophosphonate, 4-phenylthiophenyldiphenylhexafluoroarsenate, Examples include 4-phenylthiophenyl diphenyl trifluoromethane sulfonate, 4-phenyl thiophenyl diphenyl trifluoroacetate, 4-phenyl thiophenyl diphenyl-p-toluene sulfonate, and the like. Of these, triphenylsulfonium trifluoromethanesulfonate is preferably used.
Examples of the diarylphosphonium salts include (1-6-η-cumene) (η-cyclopentadienyl) iron hexafluorophosphonate.

Commercially available products of acid generators preferably used as radiation-sensitive acid generators are diaryl iodonium salts manufactured by Union Carbide, Inc. Trade names: UVI-6950, UVI-6970, UVI-6974, UVI-6990, Midori Chemical Product name: MPI-103, BBI-103, etc. can be mentioned.
Moreover, as a triarylsulfonium salt, Asahi Denka Kogyo Co., Ltd. product name: Adeka optomer SP-150, SP-151, SP-170, SP-171, Nippon Soda Co., Ltd. product name: CI-2481, CI-2624, CI-2639, CI-2064, manufactured by Midori Chemical Co., Ltd. Trade names: DTS-102, DTS-103, NAT-103, NDS-103, TPS-103, MDS-103, manufactured by Sartomer : CD-1010, CD-1011, CD-1012 and the like.

Moreover, Ciba Specialty Chemicals Co., Ltd. brand name: Irgacure 261, Nippon Kayaku Co., Ltd. brand name: PCI-061T, PCI-062T, PCI-020T, PCI-022T, etc. are mentioned as diarylphosphonium salts. be able to.
Among these, Union Carbide make brand name: UVI-6970, UVI-6974, UVI-6990, Asahi Denka Kogyo Co., Ltd. trade name: Adeka optomer SP-170, SP-171, Sartomer brand name: CD-1012, manufactured by Midori Chemical Co., Ltd., trade name: MPI-103 is preferred because the resulting protective film has a high surface hardness.

  When the resin composition of the present invention contains a radiation sensitive acid generator, the amount used is 100 parts by weight of the total amount of the polymers [A-1], [A-2] and [A-3]. The amount is preferably 0.05 to 20 parts by weight, more preferably 0.1 to 10 parts by weight. By setting the amount used in this range, a protective film having sufficient hardness can be obtained.

[D] Adhesion aid The above [D] adhesion aid can be added to improve the adhesion between the protective film to be formed and the substrate.
As such [D] adhesion assistant, for example, a functional silane coupling agent having a reactive substituent can be used. Examples of the reactive substituent include a carboxyl group, a methacryloyl group, an isocyanate group, and an epoxy group.
[D] Specific examples of the adhesion assistant include, for example, trimethoxysilylbenzoic acid, γ-methacryloxypropyltrimethoxysilane, vinyltriacetoxysilane, vinyltrimethoxysilane, γ-isocyanatopropyltriethoxysilane, γ- Examples thereof include glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, and the like.
Such [D] adhesion assistant is preferably 30 parts by weight or less, more preferably 25 parts per 100 parts by weight of the total amount of the copolymers [A-1], [A-2] and [A-3]. It is used in an amount of parts by weight or less. [D] When the amount of the adhesion assistant exceeds 30 parts by weight, the heat resistance of the obtained protective film may be insufficient.

[E] Surfactant The above surfactant can be added to improve the coating performance of the resin composition of the present invention.
Examples of such surfactants include fluorine surfactants, silicone surfactants, nonionic surfactants, and other surfactants.
Examples of the fluorosurfactant include BM CHIMIE, trade names: BM-1000, BM-1100, Dainippon Ink & Chemicals, Inc. trade names: MegaFuck F142D, F172, F173, and the like. F183, manufactured by Sumitomo 3M Co., Ltd. Product names: Florard FC-135, FC-170C, FC-430, FC-431, manufactured by Asahi Glass Co., Ltd. Product names: 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 And other commercial products.

As said silicone type surfactant, for example, Toray Dow Corning Silicone Co., Ltd. product name: SH-28PA, SH-190, SH-193, SZ-6032, SF-8428, DC-57, DC -190, Shin-Etsu Chemical Co., Ltd. product name: KP341, Shin-Akita Kasei Co., Ltd. product name: Ftop EF301, EF303, EF352, etc.
Examples of the nonionic surfactant include polyoxyethylene alkyl ethers, polyoxyethylene aryl ethers, polyoxyethylene dialkyl esters, and the like.
Examples of the polyoxyethylene alkyl ethers include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, and polyoxyethylene oleyl ether. Examples of polyoxyethylene aryl ethers include polyoxyethylene octylphenyl. Examples include ether and polyoxyethylene nonylphenyl ether. Examples of polyoxyethylene dialkyl esters include polyoxyethylene dilaurate and polyoxyethylene distearate.

As said other surfactant, Kyoeisha Chemical Co., Ltd. brand name: (meth) acrylic acid type copolymer polyflow No. 57, no. 90 etc. can be mentioned.
The addition amount of these [E] surfactant is preferably 5 parts by weight or less, more preferably 100 parts by weight or less, more preferably 100 parts by weight of the total amount of the polymers [A-1], [A-2] and [A-3]. Used in 2 parts by weight or less. When the amount of the surfactant exceeds 5 parts by weight, the coating film may be easily roughened in the coating process.

Embodiments of Resin Composition Preferred embodiments of the resin composition of the present invention include (A) among the following ( A) to (C).
(A) A resin composition containing a copolymer [A-1] , a cationic polymerizable compound [B], and a thermosensitive acid generator [C].
(B) A resin composition containing the polymer [A-2] and the polymer [A-3] and optionally a cationic polymerizable compound [B] and a heat-sensitive acid generator [C]. In the composition (b), the amount of the polymer [A-3] used is 10 to 90 parts by weight per 100 parts by weight of the total amount of the polymers [A-2] and [A-3]. The amount is preferably 20 to 80 parts by weight. When the amount of the copolymer [A-3] is less than 10 parts by weight, curing may be insufficient, and when it exceeds 90 parts by weight, heat resistance may be deteriorated.
(C) A resin composition containing a copolymer [A-3] and a cationic polymerizable compound [B] and optionally a heat-sensitive acid generator [C].

The resin composition of the present invention is prepared by uniformly dissolving or dispersing each of the above components in an appropriate solvent. As the solvent to be used, a solvent in which each component of the composition is dissolved or dispersed and does not react with each component is preferably used.
Such solvents include alcohols, ethers, glycol ethers, ethylene glycol alkyl ether acetates, diethylene glycol monoalkyl ethers, diethylene glycol dialkyl ethers, propylene glycol monoalkyl ethers, propylene glycol alkyl ether acetates, propylene Examples include glycol alkyl ether propionates, aromatic hydrocarbons, ketones, and esters.

Specific examples thereof include, for example, alcohols such as methanol, ethanol, benzyl alcohol and the like;
Ethers such as tetrahydrofuran;
Examples of glycol ethers include ethylene glycol monomethyl ether and ethylene glycol monoethyl ether;
Examples of ethylene glycol alkyl ether acetates include methyl cellosolve acetate, ethyl cellosolve acetate, ethylene glycol monobutyl ether acetate, and diethylene glycol monoethyl ether acetate;
Examples of diethylene glycol monoalkyl ethers include diethylene glycol monomethyl ether and diethylene glycol monoethyl ether;
As diethylene glycol dialkyl ethers, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol ethyl methyl ether, etc .;
As propylene glycol monoalkyl ethers, propylene glycol methyl ether, propylene glycol ethyl ether, propylene glycol propyl ether, propylene glycol butyl ether, etc .;
As propylene glycol alkyl ether acetates, propylene glycol methyl ether acetate, propylene glycol ethyl ether acetate, propylene glycol propyl ether acetate, propylene glycol butyl ether acetate, etc .;
As propylene glycol alkyl ether propionates, propylene glycol methyl ether propionate, propylene glycol ethyl ether propionate, propylene glycol propyl ether propionate, propylene glycol butyl ether propionate and the like;
Aromatic hydrocarbons such as toluene and xylene ;
As Ke ton class, methyl ethyl ketone, cyclohexanone, 4-hydroxy-4-methyl-2-pentanone, methyl isoamyl ketone;
As an ester include methyl acetate, ethyl acetate, propyl acetate, butyl acetate, ethyl 2-hydroxypropionate, 2-hydroxy-2-methylpropionic acid methyl, 2-hydroxy-2-methylpropionic acid ethyl, hydroxy methyl acetate, Ethyl hydroxyacetate, butyl hydroxyacetate, methyl lactate, ethyl lactate, propyl lactate, butyl lactate, methyl 3-hydroxypropionate, ethyl 3-hydroxypropionate, propyl 3-hydroxypropionate, butyl 3-hydroxypropionate, 2- Methyl hydroxy-3-methylbutanoate, methyl methoxyacetate, ethyl methoxyacetate, propyl methoxyacetate, butyl methoxyacetate, methyl ethoxyacetate, ethyl ethoxyacetate, propyl ethoxyacetate, butyl ethoxyacetate, propoxyvinegar Methyl, ethyl propoxyacetate, propyl propoxyacetate, butyl propoxyacetate, methyl butoxyacetate, ethyl butoxyacetate, propyl butoxyacetate, butylbutoxyacetate, methyl 2-methoxypropionate, ethyl 2-methoxypropionate, propyl 2-methoxypropionate 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-methoxypropionate Butylate, methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate, propyl 3-ethoxypropionate, butyl 3-ethoxypropionate, methyl 3-propoxypropionate, ethyl 3-propoxypropionate, 3-propoxypropionate Examples thereof include propyl acid, butyl 3-propoxypropionate, methyl 3-butoxypropionate, ethyl 3-butoxypropionate, propyl 3-butoxypropionate, and butyl 3-butoxypropionate.

Among these, alcohols, diethylene glycols, propylene glycol alkyl acetates, ethylene glycol alkyl ether acetates, diethylene glycol dialkyl ethers are preferable, and benzyl alcohol, diethylene glycol ethyl methyl ether, propylene glycol methyl ether acetate, propylene glycol ethyl ether are particularly preferable. Acetate, diethylene glycol dimethyl ether, ethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, and diethylene glycol diethyl ether are preferred.
The amount of the solvent used is preferably 1 to 50% by weight, more preferably 5% by weight, based on the total solid content in the composition of the present invention (the amount obtained by removing the amount of the solvent from the total amount of the composition including the solvent). It is the range which becomes -40 weight%.

A high boiling point solvent can be used in combination with the above solvent. Examples of the high boiling point solvent that can be used in combination here include N-methylformamide, N, N-dimethylformamide, N-methylformanilide, N-methylacetamide, N, N-dimethylacetamide, N-methylpyrrolidone, dimethylsulfoxide, and benzyl. Ethyl 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 cellosolve acetate and the like.
The amount of the high-boiling solvent used in combination is preferably 90% by weight or less, more preferably 80% by weight or less based on the total amount of the solvent.
The composition prepared as described above can be used after being filtered using a Millipore filter having a pore size of 0.2 to 3.0 μm, preferably about 0.2 to 0.5 μm. .

Formation of Color Filter Protective Film Next, a method for forming a color filter protective film using the composition of the present invention will be described.
After applying the resin composition solution of the present invention to the substrate surface, pre-baking to remove the solvent to form a coating film, a heat treatment can be performed to form a protective film for the target color filter. .

  Examples of the substrate that can be used include substrates such as glass, quartz, silicon, and resin. Examples of the resin include resins such as polyethylene terephthalate, polybutylene terephthalate, polyethersulfone, polycarbonate, polyimide, and cyclic olefin ring-opening polymers and hydrogenated products thereof.

  As a coating method, for example, an appropriate method such as a spray method, a roll coating method, a spin coating method, a bar coating method, an ink jet method or the like can be adopted, and in particular, coating using a spin coater, a spinless coater, or a slit die coater. Can be suitably used.

  The pre-baking conditions vary depending on the types and blending ratios of the components, but conditions of usually about 70 to 90 ° C. for about 1 to 15 minutes can be employed. The thickness of the coating film is preferably 0.15 to 8.5 μm, more preferably 0.15 to 6.5 μm, and still more preferably 0.15 to 4.5 μm. In addition, the thickness of a coating film here should be understood as thickness after solvent removal.

The heat treatment after the coating film is formed can be carried out by an appropriate heating device such as a hot plate or a clean oven. The processing temperature is preferably about 150 to 250 ° C., and the heating time can be 5 to 30 minutes when using a hot plate, and 30 to 90 minutes when using an oven.
In addition, when a radiation sensitive acid generator is used for the resin composition, the resin composition is applied to the substrate surface, the solvent is removed by pre-baking to form a coating film, and then a radiation irradiation treatment (exposure treatment). The target protective film can be formed by applying. If necessary, a heat treatment may be further performed after the exposure processing.

Examples of the radiation that can be used in the radiation irradiation treatment include visible light, ultraviolet light, far ultraviolet light, electron beams, X-rays, and the like, and ultraviolet light including light having a wavelength of 190 to 450 nm is preferable.
Energy of exposure generally 100~20,000J / ^{m 2,} preferably 150~10,000J / ^{m 2.}
A heat treatment may be optionally further performed after irradiation. As heating temperature at this time, about 150-250 degreeC is preferable, and appropriate apparatuses, such as a hotplate and a clean oven, can be used as a heating apparatus, for example. As the heating time, a processing time of 5 to 30 minutes can be employed when using a hot plate, and 30 to 90 minutes when using an oven.

Color filter protective film The protective film formed in this manner preferably has a thickness of 0.1 to 8 μm, more preferably 0.1 to 6 μm, and still more preferably 0.1 to 4 μm. In addition, when the protective film of this invention is formed on the board | substrate which has the level | step difference of a color filter, said film thickness should be understood as the thickness from the uppermost part of a color filter.
As is clear from the examples described below, the protective film of the present invention satisfies adhesiveness, surface hardness, transparency, heat resistance, light resistance, solvent resistance, and the like, and also with a load in a heated state. It is suitable as a protective film for an optical device that is excellent in performance of flattening the step of the color filter formed on the base substrate without being recessed.
In particular, since the protective film of the present invention may be exposed to heating exceeding 250 ° C. in the panel manufacturing process, sufficient dimensional stability at 270 ° C. has sufficient heat resistance even in that case. Guaranteed by having.

  The present invention will be described more specifically with reference to synthesis examples and examples. However, the present invention is not limited to the following examples.

Production of (co) polymer Synthesis Example 1
A flask equipped with a condenser and a stirrer was charged with 5 parts by weight of 2,2′-azobis (2,4-dimethylvaleronitrile) and 200 parts by weight of propylene glycol monomethyl ether acetate. Subsequently, after 50 parts by weight of glycidyl methacrylate and 50 parts by weight of 1-ethylcyclopentyl methacrylate were charged and purged with nitrogen, stirring was started gently. The solution temperature was raised to 70 ° C., and this temperature was maintained for 5 hours to obtain a polymer solution containing the copolymer (A1-1). The solid content concentration of the obtained polymer solution was 32.9%.

Synthesis example 2
A flask equipped with a condenser and a stirrer was charged with 5 parts by weight of 2,2′-azobis (2,4-dimethylvaleronitrile) and 200 parts by weight of propylene glycol monomethyl ether acetate. Subsequently, 40 parts by weight of glycidyl methacrylate, 40 parts by weight of 1-diethylpropyl methacrylate, 10 parts by weight of styrene, and 10 parts by weight of tricyclo [5.2.1.0 ^2,6 ] decan-8-yl methacrylate were charged. After the replacement, 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 (A1-2). The solid content concentration of the obtained polymer solution was 33.0%.

Synthesis example 3
A flask equipped with a condenser and a stirrer was charged with 5 parts by weight of 2,2′-azobis (2,4-dimethylvaleronitrile) and 200 parts by weight of propylene glycol monomethyl ether acetate. Subsequently, 40 parts by weight of glycidyl methacrylate, 40 parts by weight of 1-ethylcyclohexyl methacrylate, 10 parts by weight of styrene, and 10 parts by weight of cyclohexylmaleimide were charged, and the mixture was purged with nitrogen. The solution temperature was raised to 70 ° C., and this temperature was maintained for 5 hours to obtain a polymer solution containing a copolymer (A1-3). The solid content concentration of the obtained polymer solution was 33.0%.

Synthesis example 4
A flask equipped with a condenser and a stirrer was charged with 5 parts by weight of 2,2′-azobis (2,4-dimethylvaleronitrile) and 200 parts by weight of propylene glycol monomethyl ether acetate. Subsequently, 40 parts by weight of glycidyl methacrylate, 40 parts by weight of 1-ethylcyclopentyl methacrylate, 10 parts by weight of styrene, and 10 parts by weight of N-cyclohexylmaleimide were charged and the mixture was purged with nitrogen. The solution temperature was raised to 70 ° C., and this temperature was maintained for 5 hours to obtain a polymer solution containing a copolymer (A1-4). The solid content concentration of the obtained polymer solution was 32.7%.

Synthesis example 5
A flask equipped with a condenser and a stirrer was charged with 5 parts by weight of 2,2′-azobis (2,4-dimethylvaleronitrile) and 200 parts by weight of diethylene glycol ethyl methyl ether. Subsequently, 40 parts by weight of glycidyl methacrylate, 40 parts by weight of 1-ethylcyclopentyl methacrylate, 10 parts by weight of methacrylic acid, 5 parts by weight of styrene, and 5 parts by weight of N-cyclohexylmaleimide were charged, and the mixture was gently stirred. The solution temperature was raised to 70 ° C., and this temperature was maintained for 5 hours to obtain a polymer solution containing the copolymer (A1-5). The resulting polymer solution had a solid content concentration of 32.8%.

Synthesis Example 6
A flask equipped with a condenser and a stirrer was charged with 5 parts by weight of 2,2′-azobis (2,4-dimethylvaleronitrile) and 200 parts by weight of diethylene glycol ethyl methyl ether. Subsequently, 40 parts by weight of glycidyl methacrylate, 40 parts by weight of 2-methyl-γ-lactone-4-yl-methacrylate, 10 parts by weight of styrene, and 10 parts by weight of N-cyclohexylmaleimide were charged with nitrogen, and then gently stirred. It was. The solution temperature was raised to 70 ° C., and this temperature was maintained for 5 hours to obtain a polymer solution containing a copolymer (A1-6). The solid content concentration of the obtained polymer solution was 31.9%.

The following synthesis examples 7 to 10 are reference synthesis examples.
Synthesis example 7
A flask equipped with a condenser and a stirrer was charged with 5 parts by weight of 2,2′-azobis (2,4-dimethylvaleronitrile) and 200 parts by weight of propylene glycol monomethyl ether acetate. Subsequently, after 100 parts by weight of glycidyl methacrylate was charged and purged with nitrogen, stirring was started gently. The solution temperature was raised to 70 ° C., and this temperature was maintained for 5 hours to obtain a polymer solution containing the copolymer (A2-1). The resulting polymer solution had a solid content concentration of 33.2%.

Synthesis example 8
A flask equipped with a condenser and a stirrer was charged with 5 parts by weight of 2,2′-azobis (2,4-dimethylvaleronitrile) and 200 parts by weight of propylene glycol monomethyl ether acetate. Subsequently, after 80 parts by weight of glycidyl methacrylate and 20 parts by weight of styrene were charged and purged with nitrogen, stirring was started gently. The solution temperature was raised to 70 ° C., and this temperature was maintained for 5 hours to obtain a polymer solution containing a copolymer (A2-2). The solid content concentration of the obtained polymer solution was 33.3%.

Synthesis Example 9
A flask equipped with a condenser and a stirrer was charged with 5 parts by weight of 2,2′-azobis (2,4-dimethylvaleronitrile) and 200 parts by weight of propylene glycol monomethyl ether acetate. Subsequently, 100 parts by weight of 1-ethylcyclohexyl methacrylate was charged and purged with nitrogen, and then gently stirred. The solution temperature was raised to 70 ° C., and this temperature was maintained for 5 hours to obtain a polymer solution containing the copolymer (A3-1). The solid content concentration of the obtained polymer solution was 33.0%.

Synthesis Example 10
A flask equipped with a condenser and a stirrer was charged with 5 parts by weight of 2,2′-azobis (2,4-dimethylvaleronitrile) and 200 parts by weight of propylene glycol monomethyl ether acetate. Subsequently, 80 parts by weight of 1-ethylcyclohexyl methacrylate, 10 parts by weight of styrene, and 10 parts by weight of tricyclo [5.2.1.0 ^2,6 ] decan-8-yl methacrylate were charged, and the mixture was purged with nitrogen, followed by gentle stirring. I started. The solution temperature was raised to 70 ° C., and this temperature was maintained for 5 hours to obtain a polymer solution containing a copolymer (A3-2). The solid content concentration of the obtained polymer solution was 33.3%.

Comparative Synthesis Example 1
A flask equipped with a condenser and a stirrer was charged with 5 parts by weight of 2,2′-azobis (2,4-dimethylvaleronitrile) and 200 parts by weight of diethylene glycol ethyl methyl ether. Subsequently, 25 parts by weight of styrene, 20 parts by weight of methacrylic acid, 45 parts by weight of glycidyl methacrylate, and 10 parts by weight of tricyclo [5.2.1.0 ^2,6 ] decan-8-yl methacrylate were charged, and after the nitrogen substitution, Stirring was started. 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-1). The solid content concentration of the obtained polymer solution was 33.0%.

Comparative Synthesis Example 2
A flask equipped with a condenser and a stirrer was charged with 5 parts by weight of 2,2′-azobis (2,4-dimethylvaleronitrile) and 200 parts by weight of propylene glycol monomethyl ether acetate. Subsequently, 40 parts by weight of glycidyl methacrylate, 10 parts by weight of styrene, 40 parts by weight of t-butyl methacrylate, and 10 parts by weight of cyclohexylmaleimide were charged, and the mixture was purged with nitrogen. The solution temperature was raised to 70 ° C., and this temperature was maintained for 5 hours to obtain a polymer solution containing the copolymer (a-2). The solid content concentration of the obtained polymer solution was 33.0%.

Preparation and Evaluation of Resin Composition Example 1 (Reference Example)
A solution containing the copolymer (A1-1) obtained in Synthesis Example 1 (an amount corresponding to 100 parts by weight (solid content) of the copolymer (A1-1)) and (E) SH- After adding 0.1 parts by weight of 28PA (Toray Dow Corning Silicone Co., Ltd.) and further adding propylene glycol monomethyl ether acetate so that the solid content concentration becomes 20%, it is filtered with a Millipore filter with a pore size of 0.5 μm. A resin composition was prepared by filtration.
After applying the above composition on a SiO ₂ dip glass substrate using a spinner, pre-baking is performed on a hot plate at 80 ° C. for 5 minutes to form a coating film, and further, heat treatment is performed in an oven at 230 ° C. for 60 minutes. Thus, a protective film having a thickness of 2.0 μm was formed.

After applying the above composition on a SiO ₂ dip glass substrate using a spinner, pre-baking is performed on a hot plate at 80 ° C. for 5 minutes to form a coating film, and further, heat treatment is performed in an oven at 230 ° C. for 60 minutes. Thus, a protective film having a thickness of 2.0 μm was formed.

Evaluation of Protective Film (1) Evaluation of Transparency About the substrate having the protective film formed as described above, using a spectrophotometer (150-20 type double beam (manufactured by Hitachi, Ltd.)), 400 to 800 nm. The transmittance of was measured. Table 1 shows the minimum transmittance of 400 to 800 nm. When this value is 95% or more, it can be said that the transparency of the protective film is good.

(2) Evaluation of heat-resistant dimensional stability About the board | substrate which has a protective film formed as mentioned above, it heated on 250 degreeC in oven for 1 hour conditions, and measured the film thickness before and behind a heating. The heat-resistant dimensional stability calculated according to the following formula is shown in Table 1. When this value is 95% or more, it can be said that the heat-resistant dimensional stability is good.
Heat-resistant dimensional stability = (film thickness after heating) / (film thickness before heating) × 100 (%)

(3) Evaluation of heat-resistant color change About the board | substrate which has a protective film formed as mentioned above, it heated at 250 degreeC in oven for 1 hour, and the transparency before and behind a heating was measured similarly to said (1). The heat discoloration calculated according to the following formula is shown in Table 1. When this value is 5% or less, the heat discoloration is good.
Heat discoloration property = transmittance before heating−transmittance after heating (%)

(4) Measurement of surface hardness About the board | substrate which has a protective film formed as mentioned above, the surface hardness of the protective film was measured by the 8.4.1 pencil scratch test of JISK-5400-1990. This value is shown in Table 1. When this value is 4H or higher, the surface hardness is good.

(5) Measurement of dynamic micro hardness About a substrate having a protective film formed as described above, a ridge angle 115 ° triangular indenter (Helkovic type) using a Shimadzu dynamic micro hardness meter DUH-201 (manufactured by Shimadzu Corporation) As a result of the indentation test, the dynamic microhardness of the protective film was determined as follows: load: 0.1 gf, speed: 0.0145 gf / sec. , Holding time: 5 sec. The temperature was measured under the measurement conditions of 23 ° C and 140 ° C. The results are shown in Table 1.

(6) Evaluation of adhesion After performing a pressure cooker test (120 ° C., humidity 100%, 4 hours) on the substrate having the protective film formed as described above, 8.5 of JIS K-5400-1990. .3 Adhesiveness Adhesiveness of the protective film (adhesiveness to SiO ₂ ) was evaluated by a cross-cut tape method. Table 2 shows the number of remaining grids out of 100 grids.
In addition, as an evaluation of adhesion to Cr, a protective film having a film thickness of 2.0 μm was formed in the same manner as above except that a Cr substrate was used instead of the SiO ₂ dip glass substrate, and the same was performed by the cross-cut tape method. Evaluated. The results are shown in Table 1.

(7) Evaluation of ITO etching resistance With respect to the substrate having the protective film formed as described above, a high rate sputtering device SH-550-C12 manufactured by Japan Vacuum Technology Co., Ltd. was used. ₂ O ₃ / SnO ₂ = 90/10 weight ratio), and ITO sputtering was performed at 60 ° C. The atmosphere at this time was a degree of vacuum of 1.0 × 10 ⁻⁵ Pa, an Ar gas flow rate of 3.12 × 10 ⁻³ m ³ / h, and an O ₂ gas flow rate of 1.2 × 10 ⁻⁵ m ³ / h). The sputtered substrate was heated at 240 ° C. for 60 minutes in the above-described clean oven and annealed. Next, the substrate was set on a spinner, and a JSR G-line positive resist PFR3650-21cp was dropped onto the substrate and applied at 3500 rpm × 30 sec. The substrate was heated on a hot plate at 90 ° C. for 2 minutes to remove the solvent. After that, using an exposure machine Canon PLA501F (manufactured by Canon Inc.) through a pattern mask of 10 μm / 10 μm, intensity ratio of ghi line (wavelength 436 nm, 405 nm, 365 nm = 2.7: 2.5: 4.8). ) At an illuminance of 23 mW / m ² and 25 mJ / m ² in terms of i-line, immersed in a 2.4% TMAH aqueous solution for 60 seconds at room temperature, and rinsed in ultrapure water for 60 seconds. After that, it was air-dried. Thereafter, it was post-baked in a clean oven at 150 ° C. for 60 minutes. The etchant was prepared by mixing nitric acid / hydrochloric acid at a weight ratio of 1/3. Immerse the substrate in an etchant, take out the substrate every 10 seconds, determine the just etching time for forming a 10 μm ITO line, measure the ITO line width at 1.2 times the just etching time with an optical microscope, The results are shown in Table 1. The higher the retention rate of the 10 μm ITO line, the better the ITO etching resistance.

(8) Evaluation of planarization property A pigment-based color resist (trade names “JCR RED 689”, “JCR GREEN 706”, “CR 8200B”, above, manufactured by JSR Corporation) is applied to a spinner on a SiO ₂ dip glass substrate. And prebaked at 90 ° C. for 150 seconds on a hot plate to form a coating film. Thereafter, ghi line (intensity ratio of wavelengths 436 nm, 405 nm, 365 nm = 2.7: 2.5: 4.8) is used through a predetermined pattern mask using an exposure machine Canon PLA501F (manufactured by Canon Inc.). Irradiated with an exposure dose of 2,000 J / m ^{2 in} terms of i-line, developed with 0.05% aqueous potassium hydroxide solution, rinsed with ultrapure water for 60 seconds, and further in an oven at 230 ° C. Heat treatment was performed for 30 minutes to form a striped color filter (stripe width 100 μm) of three colors of red, green, and blue.

The unevenness on the surface of the substrate on which the color filter was formed was measured with a surface roughness meter “α-step” (trade name: manufactured by Tencor), and found to be 1.0 μm. However, the measurement was performed with a measurement length of 2,000 μm, a measurement range of 2,000 μm square, and a measurement point n = 5. That is, the measurement direction is two directions of the stripe line minor axis direction of red, green and blue directions and the stripe axis major axis direction of red, red, green, green, blue and blue, and n = 5 for each direction. Measured (total n number is 10).
On this, the composition for forming a protective film is applied with a spinner, pre-baked on a hot plate at 90 ° C. for 5 minutes to form a coating film, and further heated in an oven at 230 ° C. for 60 minutes. A protective film having a thickness of 2.0 μm from the upper surface of the color filter was formed. However, the film thickness mentioned here means the thickness from the uppermost surface of the color filter formed on the substrate.

  About the board | substrate which has a protective film on the color filter formed as mentioned above, the unevenness | corrugation on the surface of a protective film was measured with the contact-type film thickness measuring apparatus alpha-step (made by Tencor Japan Co., Ltd.). However, the measurement was performed with a measurement length of 2,000 μm, a measurement range of 2,000 μm square, and a number of measurement points n = 5. That is, the measurement direction is two directions of the stripe line minor axis direction of red, green and blue directions and the stripe axis major axis direction of red, red, green, green, blue and blue, and n = 5 for each direction. Measured (total n number is 10). Table 1 shows the average value of 10 times of the difference in height (nm) between the highest and lowest portions for each measurement. When this value is 300 nm or less, it can be said that the flatness is good.

(9) Evaluation of Storage Stability The viscosity of the resin composition for forming a protective film prepared in Example 1 was measured using an ELD viscometer manufactured by Tokyo Keiki Co., Ltd. Thereafter, the solution viscosity at 25 ° C. was measured every day while the composition was allowed to stand at 25 ° C. The number of days required to increase the viscosity by 5% based on the viscosity immediately after the preparation was determined, and the number of days is shown in Table 1. When this number of days is 20 days or more, it can be said that the storage stability is good.

Examples 2 to 28 and Comparative Examples 1 and 2
The type and amount of each component of the composition are as described in Tables 1 and 2, except that the solvents described in Tables 1 and 2 were used to match the solids concentrations in Tables 1 and 2, A resin composition was prepared in the same manner as in Example 1.
Using the protective film-forming resin composition prepared as described above, a protective film was formed and evaluated in the same manner as in Example 1. The results are shown in Tables 1 and 2.
Examples 2 to 7, 14 to 19, 27 and 28 are reference examples.

Examples 29-32
Resin composition in the same manner as in Example 1 except that the types and amounts of each component of the composition are as shown in Table 2, and the solvents shown in Table 2 were used to match the solid content concentrations shown in Table 2. A product was prepared.
A resin composition was prepared in the same manner as in Example 1 except that coating was performed using a slit die coater instead of a spin coater, and a protective film was formed and evaluated. The results are shown in Table 2.

In Tables 1 and 2, the abbreviations of the cationic polymerizable compound (B), the heat-sensitive acid generator (C), the adhesion assistant (D), and the solvent (S) represent the following.
B-1: Bisphenol A novolak type epoxy resin (trade name: Epicoat 157S65 manufactured by Japan Epoxy Resin Co., Ltd.)
C-1: Triphenylsulfonium trifluoromethanesulfonate D-1: γ-glycidoxypropyltrimethoxysilane D-2: γ-glycidoxypropyltriethoxysilane E-1: Silicone surfactant (Toray Dow Corning Silicone Co., Ltd. product name: SH-28PA)
S-1: Propylene glycol monomethyl ether acetate S-2: Diethylene glycol dimethyl ether

Claims (6)

[A-1] (a1) Polymerized units derived from a polymerizable unsaturated compound having an oxiranyl group or an oxetanyl group, and (a2) the following formula (01)

Here, R is a tertiary alkyl group having 5 or more carbon atoms, a tertiary alkyl group having 4 or more carbon atoms substituted with an alkoxy group having 1 to 4 carbon atoms, oxygen bonded to R in the above-described formula A cycloalkyl group having 3 or more ring carbon atoms bonded to the atom (—O—) with a tertiary carbon atom or a tertiary atom to an oxygen atom (—O—) bonded to R in the above-described formula A lactone ring or a lactam ring of 4 or more members bonded by a carbon atom,
In structural Ru copolymer polymer name contains a polymerized unit derived from a polymerizable unsaturated compound having a represented, and
[B] Cationic polymerizable compound
A resin composition comprising: [C] resin composition according to claim 1, further comprising a heat-sensitive acid precursor. The structure represented by the above formula (01) is represented by the following formula (1)

Here, R ¹ and R ² are each independently a C 1-8 alkyl group substituted with a C 1-8 alkyl group or a C 1-4 alkoxyl group, and R ³ Is a structure represented by an alkyl group having 1 to 8 carbon atoms substituted with an alkyl group having 2 to 8 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, the following formula (2)

Here, the definition of R ¹ is the same as in the above formula (1), n is an integer of 1 to 8, and R ⁴ , R ⁵ , R ⁶ and R ⁷ are each independently a hydrogen atom, or An alkyl group having 1 to 8 carbon atoms, an alkyl group having 1 to 8 carbon atoms having an alkoxy group having 1 to 4 carbon atoms at the terminal or side chain of the alkyl group, or an alkoxy group having 1 to 4 carbon atoms, Alternatively, R ⁴ , R ⁵ , R ⁶ and R ⁷ are combined with the carbon atom to which at least two are bonded and the carbon atom to which they are bonded and the carbon atom to which R ¹ is bonded to form a total number of carbon atoms of 7 ˜16 dicycloalkane or tricycloalkane structures may be formed. However, when n = 2 to 8, the plurality of R ⁶ and R ⁷ may be the same or different.
Or a structure represented by the following formula (3)

Here, the definition of R ¹ is the same as in the above formula (1), l is 0, 1 or 2, m is an integer of 1 to 4, X is an oxygen atom or a nitrogen atom, and R ⁸ , R ⁹ , R ¹⁰ and R ¹¹ are each independently a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a carbon having an alkoxy group having 1 to 4 carbon atoms at the terminal or side chain of the alkyl group. An alkyl group having 1 to 8 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, provided that two R ⁸ and two R ⁹ when l = 2 and a plurality when m is an integer of 2 to 4 R ¹⁰ and the plurality of R ¹¹ may be the same or different.
The resin composition of Claim 1 or 2 which is a structure represented by these . The resin composition according to any one of claims 1 to 3, a protective film formed of the color filter. A method for forming a protective film for a color filter, comprising: forming a coating film of the resin composition according to claim 2 on a substrate; and then performing heat treatment. A protective film for a color filter formed from the resin composition according to claim 4 .