JP4128116B2 - Positive photosensitive resin composition - Google Patents

Description

  The present invention relates to a positive-type photosensitive resin composition used as a surface protective film and an interlayer insulating film of a semiconductor device, a method for producing a heat-resistant cured relief pattern using the positive-type photosensitive resin composition, and The present invention relates to a semiconductor device having a cured relief pattern.

Conventionally, a polyimide resin having excellent heat resistance, electrical characteristics, mechanical characteristics, and the like has been used for a surface protective film and an interlayer insulating film of a semiconductor device. This polyimide resin is generally provided in the form of a photosensitive polyimide precursor composition. By applying, patterning with actinic rays, development, thermal imidization treatment, etc., a surface protective film and interlayer insulation are formed on a semiconductor device. A film or the like can be easily formed, and the process can be significantly shortened as compared with the conventional non-photosensitive polyimide precursor composition.
However, the photosensitive polyimide precursor composition needs to use a large amount of an organic solvent such as N-methyl-2-pyrrolidone as a developing solution in the development process. Solvent measures have been demanded. In response to this, recently, various proposals have been made on heat-resistant photosensitive resin materials that can be developed with an alkaline aqueous solution, as with photoresists.

Among them, a PBO precursor composition obtained by mixing an aqueous alkali-soluble hydroxypolyamide, such as polybenzoxazole (hereinafter also referred to as PBO) precursor, with a photoactive component such as a photosensitive diazoquinone compound is used as a positive photosensitive resin composition. A method to be used has been attracting attention in recent years (see, for example, Patent Document 1).
The development mechanism of this positive photosensitive resin is that the photosensitive diazoquinone compound in the unexposed area is insoluble in the alkaline aqueous solution, but when exposed, the photosensitive diazoquinone compound undergoes a chemical change to become an indenecarboxylic acid compound. It makes use of being soluble in an alkaline aqueous solution. By using the difference in dissolution rate with respect to the developer between the exposed portion and the unexposed portion, a relief pattern of only the unexposed portion can be created.

The PBO precursor composition described above can form a positive relief pattern by exposure and development with an alkaline aqueous solution, and the cured PBO film has the same thermosetting film characteristics as a polyimide film. It attracts attention as a promising alternative material for solvent-developed polyimide precursors. However, the PBO precursor composition obtained by the methods disclosed so far still has many problems.
For example, when a PBO precursor composition is actually used, a particularly serious problem is the amount of film loss in the unexposed area during development. When the amount of film reduction in the unexposed area is large, the shape of the relief pattern after development is remarkably deteriorated and sufficient performance cannot be obtained. As a countermeasure for this, if the molecular weight of the PBO precursor, which is the base resin, is increased, the amount of film loss in the unexposed area can be reduced. However, in this case, there is a drawback in that a development residue (scum) is generated in an exposed portion which should be completely dissolved and removed with a developer, and resolution is deteriorated. There is also a problem that the developing time of the exposed portion becomes long.

In response to this problem, it has been reported that the amount of film loss in the unexposed area during development can be suppressed by adding a specific phenol compound to the PBO precursor composition (see Patent Document 2 and Patent Document 3). However, the effect is inadequate. In particular, when the molecular weight of the PBO precursor is high, there has been a demand for a film exhibiting an effect of suppressing film reduction without generating a development residue (scum).
In addition, the relief pattern composed of the PBO precursor after the development is converted into a cured relief pattern composed of a heat-resistant PBO resin by heat treatment. In the course of this heat treatment, an uncured PBO precursor is converted. There was also a problem that the body flowed and the relief pattern shape changed greatly.
Furthermore, when this composition is stored at room temperature or the like, various performances such as sensitivity and development time are greatly changed, and there is a problem that it is difficult to use it by a process under the same conditions.
Japanese Examined Patent Publication No. 63-96162 JP-A-9-302221 JP 2000-292913 A

  The present invention is excellent in sensitivity, resolution and residue removal property, and further has a cured relief pattern shape and a small change in performance due to storage, a novel positive photosensitive resin composition, and production of a cured relief pattern using the composition It is an object of the present invention to provide a method and a semiconductor device having the cured relief pattern.

As a result of intensive studies to solve the above-mentioned problems, the present inventor has obtained a positive photosensitive resin that solves the above-mentioned problems by combining a hydroxypolyamide having a specific structure with a phenol compound having a specific structure. The inventors have found that a composition can be obtained, and have made the present invention .

That is, the present invention relates to 100 parts by mass of a hydroxypolyamide having a repeating unit represented by the general formula (1), 1 to 30 parts by mass of a phenol compound selected from the group consisting of the following compounds, and 1 to 100 parts by mass of a photosensitive diazoquinone compound. The positive photosensitive resin composition characterized by including a part is provided.

(Where X ₁ Is a tetravalent organic group having at least 2 carbon atoms, X ₂ , Y ₁ And Y ₂ Is a divalent organic group having at least 2 carbon atoms, m is an integer of 2 to 1000, n is an integer of 0 to 500, and m / (m + n)> 0.5. X ₁ And Y ₁ M dihydroxydiamide units containing X and X ₂ And Y ₂ The order of arrangement of n diamide units including is not limited. )

In the positive photosensitive resin composition of the present invention, the phenol compound is more preferably a compound selected from the group consisting of the following compounds.

The present invention also includes (1) forming the above-mentioned positive photosensitive resin composition on a substrate in the form of a layer or a film, and (2) exposing with actinic radiation through a mask, There is provided a method for producing a cured relief pattern, characterized by directly irradiating an ion beam, (3) eluting or removing an exposed portion or an irradiated portion, and (4) heat-treating the obtained relief pattern.
Furthermore, this invention provides the semiconductor device which has the above-mentioned hardening relief pattern layer.

  According to the present invention, a positive photosensitive resin composition excellent in sensitivity and resolution, excellent in residue removal, and having a good cured relief pattern shape with little deterioration due to storage, the positive photosensitive resin composition is provided. A method for producing a cured relief pattern used, and a semiconductor device having the cured relief pattern are provided.

<Positive photosensitive resin composition of the present invention>
Each component constituting the positive photosensitive resin composition of the present invention will be specifically described below.
(1) Hydroxypolyamide Hydroxypolyamide, which is the base polymer of the positive photosensitive resin composition of the present invention, is a polymer containing m dihydroxydiamide units of the following general formula (1). The dihydroxydiamide unit consists of a bisaminophenol having a structure of X ₁ (NH ₂ ) ₂ (OH) ₂ and a dicarboxylic acid having a structure of Y ₁ (COOH) ₂ . Here, the two amino groups and the hydroxy group of the bisaminophenol are each in the ortho position, and the hydroxypolyamide is closed by heating at about 300 to 400 ° C., and is a heat resistant resin. Changes to polybenzoxazole. m is preferably in the range of 2 to 1000, and more preferably in the range of 3 to 50.

If necessary, the hydroxypolyamide may be condensed with n diamide units of the following general formula (1). The diamide unit is composed of a diamine having a structure of X ₂ (NH ₂ ) ₂ and a dicarboxylic acid having a structure of Y ₂ (COOH) ₂ . n is preferably in the range of 0 to 500, and more preferably in the range of 0 to 10. If the ratio of the diamide unit in the hydroxy polyamide is too high, the solubility in an alkaline aqueous solution used as a developer is lowered. Therefore, the value of m / (m + n) is preferably 0.5 or more, 0.7 More preferably, it is more preferably 0.8 or more.

Examples of the bisaminophenol having the structure of X ₁ (NH ₂ ) ₂ (OH) ₂ include 3,3′-dihydroxybenzidine, 3,3′-diamino-4,4′-dihydroxybiphenyl, and 4,4 ′. -Diamino-3,3'-dihydroxybiphenyl, 3,3'-diamino-4,4'-dihydroxydiphenylsulfone, 4,4'-diamino-3,3'-dihydroxydiphenylsulfone, bis- (3-amino- 4-hydroxyphenyl) methane, 2,2-bis- (3-amino-4-hydroxyphenyl) propane, 2,2-bis- (3-amino-4-hydroxyphenyl) hexafluoropropane, 2,2-bis -(4-amino-3-hydroxyphenyl) hexafluoropropane, bis- (4-amino-3-hydroxyphenyl) methane, 2,2-bis -(4-amino-3-hydroxyphenyl) propane, 4,4'-diamino-3,3'-dihydroxybenzophenone, 3,3'-diamino-4,4'-dihydroxybenzophenone, 4,4'-diamino- 3,3′-dihydroxydiphenyl ether, 3,3′-diamino-4,4′-dihydroxydiphenyl ether, 1,4-diamino-2,5-dihydroxybenzene, 1,3-diamino-2,4-dihydroxybenzene, 1 , 3-diamino-4,6-dihydroxybenzene and the like, but are not limited thereto. These diamines may be used alone or in combination.
Particularly preferred among these bisaminophenols is when X ₁ is an aromatic group selected from the following.

_As the diamine having a structure of X _{2 (NH 2)} 2, an aromatic diamine, such as silicon diamine.
Among these, examples of the aromatic diamine include m-phenylenediamine, p-phenylenediamine, 2,4-tolylenediamine, 3,3′-diaminodiphenyl ether, 3,4′-diaminodiphenyl ether, and 4,4′-diamino. Diphenyl ether, 3,3'-diaminodiphenylsulfone, 4,4'-diaminodiphenylsulfone, 3,4'-diaminodiphenylsulfone, 3,3'-diaminodiphenylmethane, 4,4'-diaminodiphenylmethane, 3,4'- Diaminodiphenylmethane, 4,4′-diaminodiphenyl sulfide, 3,3′-diaminodiphenyl ketone, 4,4′-diaminodiphenyl ketone, 3,4′-diaminodiphenyl ketone, 2,2′-bis (4-aminophenyl) ) Propane, 2,2'-bis (4-aminophenyl) hexa Fluoropropane, 1,3-bis (3-aminophenoxy) benzene, 1,3-bis (4-aminophenoxy) benzene, 1,4-bis (4-aminophenoxy) benzene, 4-methyl-2,4-bis ( 4-aminophenyl) -1-pentene, 4-methyl-2,4-bis (4-aminophenyl) -2-pentene, 1,4-bis (α, α-dimethyl-4-aminobenzyl) benzene, imino- Di-p-phenylenediamine, 1,5-diaminonaphthalene, 2,6-diaminonaphthalene, 4-methyl-2,4-bis (4-aminophenyl) pentane, 5 (or 6) -amino-1- (4- Aminophenyl) -1,3,3-trimethylindane, bis (p-aminophenyl) phosphine oxide, 4,4′-diaminoazobenzene, 4,4′-diamino Phenylurea, 4,4′-bis (4-aminophenoxy) biphenyl, 2,2-bis [4- (4-aminophenoxy) phenyl] propane, 2,2-bis [4- (4-aminophenoxy) phenyl ] Hexafluoropropane, 2,2-bis [4- (3-aminophenoxy) phenyl] benzophenone, 4,4'-bis (4-aminophenoxy) diphenylsulfone, 4,4'-bis [4- (α, α-dimethyl-4-aminobenzyl) phenoxy] benzophenone, 4,4′-bis [4- (α, α-dimethyl-4-aminobenzyl) phenoxy] diphenylsulfone, 4,4′-diaminobiphenyl, 4,4 '-Diaminobenzophenone, phenylindanediamine, 3,3'-dimethoxy-4,4'-diaminobiphenyl, 3,3'-dimethyl-4,4'-di Aminobiphenyl, o-toluidine sulfone, 2,2-bis (4-aminophenoxyphenyl) propane, bis (4-aminophenoxyphenyl) sulfone, bis (4-aminophenoxyphenyl) sulfide, 1,4- (4-amino) Phenoxyphenyl) benzene, 1,3- (4-aminophenoxyphenyl) benzene, 9,9-bis (4-aminophenyl) fluorene, 4,4′-di- (3-aminophenoxy) diphenylsulfone, 4,4 At least one selected from the group consisting of a chlorine atom, a fluorine atom, a bromine atom, a methyl group, a methoxy group, a cyano group, and a phenyl group, wherein the hydrogen atom of the aromatic nucleus of these aromatic diamines, such as' -diaminobenzanilide, etc. Examples include, but are not limited to, compounds substituted by groups or atoms. There.

In addition, silicon diamine can be selected in order to improve the adhesion to the substrate. Examples of this include bis (4-aminophenyl) dimethylsilane, bis (4-aminophenyl) tetramethylsiloxane, and bis (p -Aminophenyl) tetramethyldisiloxane, bis (γ-aminopropyl) tetramethyldisiloxane, 1,4-bis (γ-aminopropyldimethylsilyl) benzene, bis (4-aminobutyl) tetramethyldisiloxane, bis ( (γ-aminopropyl) tetraphenyldisiloxane and the like, but are not limited thereto.
Moreover, as preferable dicarboxylic acid, the case where Y < ₁ >, Y < ₂ > is the aromatic group chosen from the following is mention | raise | lifted.

Wherein A is a divalent group selected from the group consisting of —CH ₂ —, —O—, —S—, —SO ₂ —, —CO—, —NHCO—, —C (CF ₃ ) ₂ —. Means a group.)
In the hydroxypolyamide having the repeating unit represented by the general formula (1), it is also included in the scope of the present invention to seal the terminal group with a specific organic group.
Examples of such a sealing group include a group having an unsaturated bond as described in JP-A-5-197153, and when sealed with these, the coating film machine after heat curing is used. It is expected that the physical properties (particularly elongation) and the cured relief pattern shape will be good. Preferable examples of such a sealing group include, but are not limited to, the following.

(2) Photosensitive diazoquinone compound The photosensitive diazoquinone compound used in the present invention is a compound having a 1,2-benzoquinonediazide structure or a 1,2-naphthoquinonediazide structure. US Pat. No. 2,772,972, No. No. 2,797,213, No. 3,669,658 and the like. As an example of a preferable thing, the following are mentioned, for example.

(In the formula, Q is a hydrogen atom or a naphthoquinone diazide sulfonate group shown below, and all Qs are not hydrogen atoms at the same time.)

Among these, the following are particularly preferable.

  The blending amount of the photosensitive diazoquinone compound into the hydroxypolyamide is preferably 1 to 100 parts by mass with respect to 100 parts by mass of the hydroxypolyamide. When the blending amount of the photosensitive diazoquinone compound is less than 1 part by mass, the patterning property of the resin is poor. On the contrary, when it exceeds 100 parts by mass, the tensile elongation of the cured film is remarkably lowered, and the development residue in the exposed part ( Scum) becomes extremely intense.

(3) Phenol compound In the positive photosensitive resin composition of the present invention, it is important to further contain a phenol compound represented by the general formula (2).

(In the formula, R ₁ represents a group or atom selected from the group consisting of a hydrogen atom, an alkyl group, a halogen atom, a hydroxyl group, an alkoxyl group, an alkylcarbonyl group, an alkylcarbonyloxy group, and a urea group. And a may be an integer of 0 to 5.)

  The phenol compound is more preferably a phenol compound represented by the general formula (3).

(In the formula, R ₂ represents a group or atom selected from the group consisting of a hydrogen atom, an alkyl group, a halogen atom, a hydroxyl group, an alkoxyl group, an alkylcarbonyl group, an alkylcarbonyloxy group, and a urea group. And each b may be different, and b is an integer of 0 to 4.)

  When the phenol compound represented by the general formula (2) or the general formula (3) is added to the positive photosensitive resin composition composed of the above-mentioned hydroxypolyamide and the photosensitive diazoquinone compound, the dissolution rate in the exposed area increases, and the sensitivity Will improve. In addition, the amount of film loss in the unexposed area as seen when the molecular weight of the PBO precursor, which is the base resin, is reduced to increase the sensitivity is very small (the dissolution rate of the unexposed area is not greatly increased). Also, when the molecular weight of the PBO precursor is increased to reduce the amount of film loss in the unexposed area, the development residue (scum) in the exposed area is hardly observed when the phenol compound is added, and the resolution is reduced. Greatly improved. Preferred examples of the phenol compound include the following.

  Among these, the following phenol compounds are particularly preferable.

  As addition amount of a phenol compound, 1-30 mass parts is preferable with respect to 100 mass parts of hydroxy polyamide. If the addition amount is less than 1 part by mass, the effects of high sensitivity and high resolution cannot be obtained. On the other hand, if the addition amount exceeds 30 parts by mass, the film loss during development increases and the practicality is lacking.

(4) Other components In the positive photosensitive resin composition of the present invention, a dye, a surfactant, a stabilizer, and a substrate, which are conventionally used as additives for photosensitive resin compositions, are added to the positive photosensitive resin composition of the present invention. It is also possible to add an adhesion aid, a crosslinking agent or the like for improving the adhesion.

  More specifically about the additive, the dye is, for example, methyl violet, crystal violet, malachite green and the like, and the surfactant is, for example, polyglycols such as polypropylene glycol or polyoxyethylene lauryl ether or Nonionic surfactants composed of the derivatives, for example, fluorine such as Fluorard (trade name, manufactured by Sumitomo 3M), MegaFac (trade name, manufactured by Dainippon Ink and Chemicals), or Sulflon (trade name, manufactured by Asahi Glass) Organic siloxane surfactants such as KP341 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), DBE (trade name, manufactured by Chisso), granol (trade name, manufactured by Kyoeisha Chemical Co., Ltd.) For example, alkyl imidazoline, butyric acid, alkyl acid, polyhydroxy Styrene, polyvinyl methyl ether, t- butyl novolac, epoxysilane, epoxy polymers, and various silane coupling agents.

  Specific preferred examples of the silane coupling agent include, for example, N-phenyl-3-aminopropyltrialkoxysilane, 3-mercaptopropyltrialkoxysilane, 2- (trialkoxysilylethyl) pyridine, and 3-methacryloxypropyl. Trialkoxysilane, 3-methacryloxypropyl dialkoxyalkylsilane, 3-glycidoxypropyltrialkoxysilane, 3-glycidoxypropyl dialkoxyalkylsilane, 3-aminopropyltrialkoxysilane or 3-aminopropyl dialkoxyalkyl Silane and acid anhydride or acid dianhydride reactant, 3-aminopropyltrialkoxysilane or 3-aminopropyl dialkoxyalkylsilane amino group converted to urethane group or urea group And the like of. In this case, methyl group, ethyl group, butyl group, etc. as the alkyl group, maleic anhydride, phthalic anhydride, etc. as the acid anhydride, pyromellitic dianhydride as the acid dianhydride, 3,3 ′, 4,4′-benzophenonetetracarboxylic dianhydride, 4,4′-oxydiphthalic dianhydride, etc., t-butoxycarbonylamino group as a urethane group, phenylamino as a urea group Examples thereof include a carbonylamino group.

  1,1,2,2-tetra (p-hydroxyphenyl) ethane, tetraglycidyl ether, glycerol triglycidyl ether, ortho-secondary butylphenyl glycidyl ether, 1,6-bis (2,3-epoxypropoxy) Epoxy compounds such as naphthalene, diglycerol polyglycidyl ether, polyethylene glycol glycidyl ether, acetylacetone aluminum (III) salt, acetylacetone titanium (IV) salt, acetylacetone chromium (III) salt, acetylacetone magnesium (II) salt, acetylacetone nickel (II) Salt, trifluoroacetylacetone aluminum (III) salt, trifluoroacetylacetone titanium (IV) salt, trifluoroacetylacetone chromium (III) salt, Metal chelating agents such as uroacetylacetone magnesium (II) salt and trifluoroacetylacetone nickel (II) salt, Nicalak MW-30MH, MW-100LH (trade name, manufactured by Sanwa Chemical Co., Ltd.), Cymel 300, Cymel 303 (trade name) There are alkylated melamine resins such as Mitsui Cytec.

  In the present invention, these components are dissolved in a solvent to form a varnish and used as a positive photosensitive resin composition. Examples of such a solvent include N-methyl-2-pyrrolidone, γ-butyrolactone, N, N-dimethylacetamide, dimethyl sulfoxide, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether. , Propylene glycol monomethyl ether acetate, methyl lactate, ethyl lactate, butyl lactate, methyl-1,3-butylene glycol acetate, 1,3-butylene glycol-3-monomethyl ether, methyl pyruvate, ethyl pyruvate, methyl-3- Methoxypropionate or the like can be used alone or in combination. Of these solvents, non-amide solvents are preferable from the viewpoint of little influence on photoresists, and specific more preferable examples include γ-butyrolactone, cyclopentanone, cyclohexanone, isophorone and the like.

<Method for producing cured relief pattern using positive photosensitive resin composition of the present invention>
Next, a method for producing a cured relief pattern by applying the positive photosensitive resin composition of the present invention to a substrate will be specifically described below.
First, the positive photosensitive resin composition of the present invention is applied to a substrate such as a silicon wafer, a ceramic substrate, or an aluminum substrate by spin coating using a spinner or a roll coater. This is dried at 50 to 140 ° C. using an oven or a hot plate to remove the solvent.
Second, exposure with actinic radiation is performed through a mask using a contact aligner or a stepper, or light, electron beam, or ion beam is directly irradiated.
Third, the irradiated portion is dissolved and removed with a developer, and then rinsed with a rinse solution to obtain a desired relief pattern. As a developing method, methods such as spray, paddle, dip, and ultrasonic can be used. As the rinsing liquid, distilled water, deionized water or the like can be used.

The developer used for developing the photosensitive resin film formed with the positive photosensitive resin composition of the present invention is an alkaline aqueous solution in which an alkali-soluble polymer is dissolved and removed, and an alkali compound is dissolved. is required. The alkali compound dissolved in the developer may be either an inorganic alkali compound or an organic alkali compound.
Examples of the inorganic alkali compound include lithium hydroxide, sodium hydroxide, potassium hydroxide, diammonium hydrogen phosphate, dipotassium hydrogen phosphate, disodium hydrogen phosphate, lithium silicate, sodium silicate, potassium silicate. Lithium carbonate, sodium carbonate, potassium carbonate, lithium borate, sodium borate, potassium borate, ammonia and the like.

Examples of the organic alkali compound include tetramethylammonium hydroxide, tetraethylammonium hydroxide, trimethylhydroxyethylammonium hydroxide, methylamine, dimethylamine, trimethylamine, monoethylamine, diethylamine, triethylamine, n-propylamine, diethylamine. -N-propylamine, isopropylamine, diisopropylamine, methyldiethylamine, dimethylethanolamine, ethanolamine, triethanolamine and the like.
Furthermore, if necessary, an appropriate amount of a water-soluble organic solvent such as methanol, ethanol, propanol, or ethylene glycol, a surfactant, a storage stabilizer, a resin dissolution inhibitor, or the like can be added to the alkaline aqueous solution.
Finally, the obtained relief pattern can be heat-treated to form a heat-resistant cured relief pattern having a polybenzoxazole structure.

  The cured relief pattern created by the above-described manufacturing method is used to manufacture a known semiconductor device as a surface protective film, an interlayer insulating film, a rewiring insulating film, a flip chip device protective film, or a protective film for a device having a bump structure. A semiconductor device can be manufactured by combining with the method. It is also useful as interlayer insulation for multilayer circuits, cover coats for flexible copper-clad plates, solder resist films, liquid crystal alignment films, and the like.

The present invention will be described based on reference examples and examples.
<Synthesis of hydroxy polyamide>
[Reference Example 1]
In a 3 L separable flask, 183.1 g (0.5 mol) of 2,2-bis (3-amino-4-hydroxyphenyl) -hexafluoropropane, 640.9 g of N, N-dimethylacetamide (DMAC) Then, 63.3 g (0.8 mol) of pyridine was mixed and stirred at room temperature (25 ° C.) to obtain a uniform solution. A solution prepared by dissolving 118.0 g (0.4 mol) of 4,4′-diphenyl ether dicarbonyl chloride in 354 g of diethylene glycol dimethyl ether (DMDG) was added dropwise thereto from a dropping funnel. At this time, the separable flask was cooled in a water bath at 15 to 20 ° C. The time required for dropping was 40 minutes, and the temperature of the reaction solution was 30 ° C. at the maximum.

3 hours after completion of dropping, 30.8 g (0.2 mol) of 1,2-cyclohexyldicarboxylic acid anhydride was added to the reaction solution, and the mixture was allowed to stir at room temperature for 15 hours, and 99% of all amine end groups of the polymer chain were carboxylated. Sealed with a cyclohexylamide group. The reaction rate at this time can be easily calculated by tracking the remaining amount of 1,2-cyclohexyldicarboxylic anhydride added by HPLC. Thereafter, the above reaction solution is dropped into 2 L of water under high-speed stirring to disperse and precipitate the polymer, and this is recovered, appropriately washed with water and dehydrated, and then vacuum-dried to give a GPC molecular weight of 9000 (polystyrene equivalent) hydroxypolyamide (P -1) was obtained.
In addition, when further purification of the polymer is necessary, it can be carried out by the following method. That is, after the polymer obtained above is redissolved in γ-butyrolactone (GBL), this is treated with a cation exchange resin and an anion exchange resin, and the resulting solution is poured into ion exchange water. A purified polymer can be obtained by filtering the precipitated polymer, washing with water, and vacuum drying.

[Reference Example 2]
In a separable flask having a capacity of 2 L, 2,7-bis (3-amino-4-hydroxyphenyl) -hexafluoropropane (197.8 g, 0.54 mol), pyridine (75.9 g, 0.96 mol), and DMAc (692 g) were added. The mixture was stirred and dissolved at room temperature (25 ° C.). A solution obtained by dissolving 19.7 g (0.12 mol) of 5-norbornene-2,3-dicarboxylic anhydride in 88 g of DMDG was added dropwise thereto from a dropping funnel. The time required for the dropwise addition was 40 minutes, and the maximum reaction solution temperature was 28 ° C.
After completion of the dropwise addition, the mixture was heated to 50 ° C. with a hot water bath and stirred for 18 hours, and then the IR spectrum of the reaction solution was measured to confirm that characteristic absorption of imide groups at 1385 and 1772 cm ⁻¹ appeared.

  Next, this was cooled to 8 ° C. with a water bath, and a solution prepared by dissolving 142.3 g (0.48 mol) of 4,4′-diphenyl ether dicarboxylic acid dichloride in 398 g of DMDG was added dropwise from the dropping funnel. The time required for the dropping was 80 minutes, and the maximum reaction solution temperature was 12 ° C. 3 hours after the completion of dropping, the above reaction solution was dropped into 12 L of water under high-speed stirring to disperse and precipitate the polymer, and this was recovered, appropriately washed with water, dehydrated and then vacuum-dried to obtain hydroxypolyamide (P-2) Got. The weight average molecular weight of the thus synthesized hydroxypolyamide by GPC was 14,000 in terms of polystyrene.

<Preparation of positive photosensitive resin composition>
100 parts by mass of the hydroxypolyamide (P-1 or P-2) obtained in each of the above reference examples, 20 parts by mass of a photosensitive diazoquinone compound having the structure of the following formula Q-1, and the following formulas F-1 to F- After dissolving 10 parts by mass of the phenolic compound having the structure of 4 in 170 parts by mass of GBL, it was filtered through a 0.2 μm filter, and positive photosensitives of Examples 1 to 3 and Comparative Examples 1 and 2 described in Table 1 were used. A functional resin composition was prepared.

<Evaluation of positive photosensitive resin composition>
(1) Evaluation of patterning characteristics The positive photosensitive resin composition is spin-coated on a 5-inch silicon wafer with a spin coater (Dspin 636) manufactured by Dainippon Screen Mfg. Co., Ltd., and pre-baked at 130 ° C. for 180 seconds on a hot plate. A 10.7 μm coating film was formed. The film thickness was measured with a film thickness measuring device (Lambda Ace) manufactured by Dainippon Screen Mfg.
This coating film was exposed through a reticle with a test pattern by using a Nikon stepper (NSR2005i8A) having an exposure wavelength of i-line (365 nm) while changing the exposure stepwise. Using an alkali developer (AZ300MIF developer, 2.38 mass% tetramethylammonium hydroxide aqueous solution) manufactured by Clariant Japan, the development time was adjusted so that the film thickness after development was 9.1 μm at 23 ° C. Development was then performed to form a positive relief pattern. Table 2 shows the sensitivity, resolution, and residue removability of the positive photosensitive resin composition.

The sensitivity and resolution of the positive photosensitive resin composition were evaluated as follows.
[Sensitivity (mJ / cm ² )]
The minimum exposure amount that can completely dissolve and remove the exposed portion of the coating film during the development time.
[Resolution (μm)]
Minimum resolution pattern size at the above exposure.
Furthermore, the obtained relief pattern was subjected to curing (heat curing treatment) at 320 ° C. for 1 hour in a vertical curing furnace (manufactured by Koyo Lindberg) to obtain polybenzoxazole (PBO) which is a heat-resistant film. ) Membrane. Table 2 also shows the result of observing with an optical microscope how much the shape of the relief pattern changed from the shape of the relief pattern before curing by curing.

  From Table 2, it can be seen that a cured relief pattern with high sensitivity and high resolution can be formed by using the positive photosensitive resin composition of the present invention. Furthermore, the generation of a residue after development is not observed, and there is almost no change in the relief pattern shape due to curing. On the other hand, the compositions of Comparative Examples 1 and 2 that did not contain a phenol compound that satisfies the requirements of the present invention had low sensitivity and resolution, and a residue was generated after development, and the relief pattern shape was greatly changed by curing.

(2) Storage stability evaluation After the positive photosensitive resin composition prepared as described above was filtered, the above-mentioned patterning characteristics evaluation was performed after being left at 25 ° C. for 2 weeks. At this time, the coating rotation speed and development time were the same as those before standing for 2 weeks, and Table 3 shows the rate of change of the coating film thickness, the film thickness after development, and the sensitivity over time. The rate of change was calculated as follows.
(Change rate) = {(value after leaving for 2 weeks) − (initial value)} / (initial value) × 100
From Table 3, it can be seen that the positive photosensitive resin composition of the present invention exhibits excellent storage stability. On the other hand, in the compositions of Comparative Examples 1 and 2 that did not contain a phenol compound that satisfies the requirements of the present invention, the coating film thickness, post-development film thickness, and sensitivity changed greatly.

  The positive photosensitive resin composition of the present invention includes a surface protective film for a semiconductor device, an interlayer insulating film, a rewiring insulating film, a protective film for a flip chip device, a protective film for a device having a bump structure, and an interlayer of a multilayer circuit. It can be suitably used as an insulating film, a cover coat of a flexible copper-clad plate, a solder resist film, a liquid crystal alignment film, and the like.

Claims (4)

It contains 100 parts by mass of a hydroxypolyamide having a repeating unit represented by the general formula (1), 1 to 30 parts by mass of a phenol compound selected from the group consisting of the following compounds, and 1 to 100 parts by mass of a photosensitive diazoquinone compound. A positive photosensitive resin composition.

Wherein X ₁ is a tetravalent organic group having at least 2 carbon atoms, X ₂ , Y ₁ and Y ₂ are divalent organic groups having at least 2 carbon atoms, m is 2 to 2 An integer of 1000, n is an integer of 0 to 500, and m / (m + n)> 0.5, where m dihydroxydiamide units including X ₁ and Y ₁ , and X ₂ and Y ₂ are (The order of arrangement of the n diamide units contained is not limited.)

The positive photosensitive resin composition according to claim 1 , wherein the phenol compound is a compound selected from the group consisting of the following compounds .

(1) The positive photosensitive resin composition according to claim 1 or 2 is formed on a substrate in the form of a layer or a film, and (2) exposure with actinic radiation through a mask, A method for producing a cured relief pattern, comprising directly irradiating an electron beam or an ion beam, (3) elution or removal of an exposed portion or an irradiated portion, and (4) heat-treating the obtained relief pattern. The semiconductor device which has a hardening relief pattern layer obtained by the manufacturing method of Claim 3.