JPWO2020158360A1 - Adhesive composition containing dimer diol copolymerized polyimide urethane resin - Google Patents

Abstract

Provided is an adhesive composition having excellent adhesiveness, humidifying solder heat resistance and low dielectric properties. A polyimide urethane resin (A) containing a polycarboxylic acid derivative component (a1) having an acid anhydride group, a dimerdiol component (a2), and an isocyanate component (a3) as copolymerization components.

Description

The present invention relates to an adhesive composition containing a dimer diol copolymerized polyimide urethane resin. More specifically, the present invention relates to an adhesive composition used for adhering a resin base material to a resin base material or a metal base material. In particular, the present invention relates to an adhesive composition for a flexible printed wiring board (hereinafter abbreviated as FPC).

Since the flexible printed wiring board (FPC) has excellent flexibility, it can be used for multi-functionality and miniaturization of personal computers (PCs) and smartphones, and therefore, an electronic circuit board is incorporated in a narrow and complicated interior. It is often used for. In recent years, electronic devices have become smaller, lighter, higher in density, and have higher output, and due to these trends, the demand for the performance of wiring boards (electronic circuit boards) has become more and more sophisticated.

In recent years, high-frequency electric signals have been used in these products in order to transmit and process a large amount of information at high speed. However, since high-frequency signals are very easily attenuated, transmission loss is also transmitted to the multilayer wiring board and the like. Ingenuity is required to suppress.

The transmission loss can be distinguished into a "dielectric loss" derived from the insulating material around the dielectric, that is, the conductor (copper circuit), and a "conductor loss" derived from the copper circuit itself, and both must be suppressed.

The dielectric loss depends on the frequency and the relative permittivity and dielectric loss tangent of the insulating material around the copper circuit. The higher the frequency, the more it is necessary to use a material having a low dielectric constant and a low dielectric loss tangent as the insulating material.

On the other hand, the conductor loss is caused by the skin effect, that is, the phenomenon that the AC current density on the surface of the copper circuit becomes high and the resistance becomes high, and becomes remarkable when the frequency exceeds 5 GHz. The main countermeasure for conductor loss is smoothing of the copper circuit surface.

In order to suppress the dielectric loss, as described above, it is preferable to use a material having a low dielectric constant and a low dielectric loss tangent as the insulating material, and as such, a biphenyl structure as in Patent Documents 1 and 2 is used. Polyamide-imide resins polymerized using the monomers have been studied.

Japanese Unexamined Patent Publication No. 2005-68226 JP-A-2007-204714

However, although the resins disclosed in Patent Documents 1 and 2 have good dielectric properties and solder heat resistance, there is a problem that compounds having a biphenyl structure are limited and the raw material cost of the compounds is high.

The present invention is a new polyimide urethane-based adhesive composition that exhibits excellent adhesive strength and heat resistance to humidified solder, and has low relative permittivity and dielectric loss tangent (hereinafter, both may be collectively referred to as dielectric properties). The main issue is to provide goods at low cost.

As a result of diligent studies to achieve the above target, the present inventors have good adhesive strength and humidified solder heat resistance by copolymerizing a dimerdiol component with a polyimide urethane resin as a softening component, and further have low dielectric properties. It has been found that an adhesive composition can be obtained.

That is, the present invention has the following configuration.

As the copolymerization component, a polyimide urethane resin (A) containing a polycarboxylic acid derivative component (a1) having an acid anhydride group, a dimerdiol component (a2), and an isocyanate component (a3), and a cross-linking agent (B) are used. Polyimide urethane adhesive composition containing.

The cross-linking agent (B) is preferably an epoxy resin.

Since the adhesive composition of the present invention is excellent in adhesiveness, humidifying solder heat resistance and low dielectric property, it can be suitably used in an electronic component having an interlayer insulating layer or an adhesive layer.

Hereinafter, the polyimide urethane adhesive composition of the present invention will be described in detail. The polyimide urethane adhesive composition of the present invention is an adhesive composition containing a polyimide urethane resin (A) containing dimerdiol as an essential component.

<Polyimide urethane resin (A)>
The polyimide urethane resin (A) of the present invention is a resin containing at least a polycarboxylic acid derivative component (a1) having an acid anhydride group, a dimerdiol component (a2), and an isocyanate component (a3) as a copolymerization component. It is preferably a resin containing only a polycarboxylic acid derivative component (a1) having an acid anhydride group, a dimerdiol component (a2), and an isocyanate component (a3) as a copolymerization component. The polyimide urethane resin (A) has at least one imide bond and at least one urethane bond in the repeating unit. Further, it may have an amide bond as long as the effect of the present invention is not impaired. In this case, it is a polyamide-imide urethane resin.

<Polycarboxylic acid derivative component having an acid anhydride group (a1)>
The component (a1) (hereinafter, also simply referred to as the component (a1)) constituting the polyimide urethane-based adhesive composition of the present invention has a role as a rigid component of the polyimide urethane resin (A). Specifically, it is a polycarboxylic acid derivative having an acid anhydride group that reacts with an isocyanate component to form a polyimide resin, and is, for example, an aromatic polycarboxylic acid derivative, an aliphatic polycarboxylic acid derivative, or an alicyclic poly. A carboxylic acid derivative can be used. These can be used alone or in combination of two or more. Of these, aromatic polycarboxylic acid derivatives are preferable. Further, the valence of the polycarboxylic acid derivative is not particularly limited. The acid anhydride group preferably has one or two in one molecule, and one or more carboxyl groups may be contained in the polycarboxylic acid derivative having an acid anhydride. In this case, the obtained resin is a polyamide-imide urethane resin.

The aromatic polycarboxylic acid derivative is not particularly limited, but for example, trimellitic anhydride (TMA), 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] propanoic hydride ( BisDA), p-phenylene bis (trimeritate anhydride) (TAHQ), 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA), 2,2-bis [4- (2,3-dicarboxy) Phenoxy) phenyl] propanoic acid dianhydride, pyromellitic dianhydride, ethylene glycol bisamhydrotrimeritate, propylene glycol bisanhydrotrimeritate, 1,4-butanediol bisuanhydrotrimeritate, hexamethylene Alkylene glycol bisanhydro trimellitate such as glycol bisanhydro trimellitate, polyethylene glycol bisanhydrotrimerite, polypropylene glycol bisanhydrotrimerite, 3,3'-4,4'-benzophenone tetracarboxylic acid Dianhydride, 3,3'-4,4'-biphenyltetracarboxylic acid dianhydride, 1,2,5,6-naphthalenetetracarboxylic acid dianhydride, 1,4,5,8-naphthalenetetracarboxylic acid Dianhydride, 2,3,5,6-pyridinetetracarboxylic acid dianhydride, 3,4,9,10-perylenetetracarboxylic acid dianhydride, 3,3', 4,4'-diphenylsulfonetetra Carboxyl dianhydride, m-terphenyl-3,3', 4,4'-tetracarboxylic hydride, 4,4'-oxydiphthalic hydride, 1,1,1,3,3,3 -Hexafluoro-2,2-bis (2,3- or 3,4-dicarboxyphenyl) propane dianhydride, 2,2-bis (2,3- or 3,4-dicarboxyphenyl) propane dianhydride 1,1,1,3,3,3-hexafluoro-2,2-bis [4- (2,3- or 3,4-dicarboxyphenoxy) phenyl] propane dianhydride, or 1,3 -Bis (3,4-dicarboxyphenyl) -1,1,3,3-tetramethyldisiloxane dianhydride and the like can be mentioned.

The aliphatic polycarboxylic acid derivative or the alicyclic polycarboxylic acid derivative is not particularly limited, and for example, butane-1,2,3,4-tetracarboxylic acid dianhydride, pentane-1,2,4,5 -Tetracarboxylic acid dianhydride, cyclobutane tetracarboxylic acid dianhydride, hexahydropyromellitic dianhydride, cyclohexa-1-ene-2,3,5,6-tetracarboxylic acid dianhydride, 3-ethylcyclohexyl Sa-1-ene-3- (1,2), 5,6-tetracarboxylic dianhydride, 1-methyl-3-ethylcyclohexane-3- (1,2), 5,6-tetracarboxylic acid Dianhydride, 1-methyl-3-ethylcyclohexa-1-ene-3- (1,2), 5,6-tetracarboxylic acid dianhydride, 1-ethylcyclohexane-1- (1,2) , 3,4-Tetracarboxylic dianhydride, 1-propylcyclohexane-1- (2,3), 3,4-Tetracarboxylic dianhydride, 1,3-dipropylcyclohexane-1- (2,3), 3- (2,3) -Tetracarboxylic Acid Dianhydride, Dicyclohexyl-3,4,3', 4'-Tetracarboxylic Acid Dianhydride, Bicyclo [2,2,1] Heptane-2,3,5,6-tetracarboxylic acid dianhydride, bicyclo [2,2,2] octane-2,3,5,6-tetracarboxylic acid dianhydride, bicyclo [2,2,2] Examples thereof include octo-7-ene-2,3,5,6-tetracarboxylic acid dianhydride, hexahydrotrimeric acid anhydride and the like.

These polycarboxylic acid derivatives having an acid anhydride group may be used alone or in combination of two or more. Considering low dielectric properties, cost, etc., trimellitic anhydride, 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] propanoic hydride, p-phenylene bis (trimeritate anhydride) (Product) 4,4'-(hexafluoroisopropylidene) diphthalic anhydride, pyromellitic anhydride, ethylene glycol bisamhydrotrimeritate, 3,3', 4,4'-benzophenone tetracarboxylic dianhydride , Or 3,3', 4,4'-biphenyltetracarboxylic hydride is preferred, trimellitic anhydride, or 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] propanoic acid. Dianhydride, p-phenylenebis (trimeritate anhydride), 4,4'-(hexafluoroisopropylidene) diphthalic anhydride are particularly preferred.

The content of the component (a1) is preferably 1% by mass or more, more preferably 2% by mass or more, and further preferably 5% by mass or more in the polyimide urethane resin (A). Further, it is preferably 40% by mass or less, more preferably 35% by mass or less, and further preferably 30% by mass or less. Within the above range, excellent adhesiveness, humidifying solder heat resistance and low dielectric properties can be exhibited.

<Dimerdiol component (a2)>
The component (a2) constituting the polyimide urethane resin (A) of the present invention has a role as a flexible component of the polyimide urethane resin (A) (hereinafter, also simply referred to as the component (a2)), and is a dimerdiol. There is no particular limitation. The dimer diol is preferably a reduction reaction product derived from a polymer fatty acid. Polymer fatty acids are also called dimer acids, and are 18-carbon (C18) unsaturated fatty acids such as oleic acid, linoleic acid, and linolenic acid, drying oil fatty acids or semi-drying oil fatty acids, and lower monoalcohols of these fatty acids. It is a binary polymer of an ester in the presence or absence of a catalyst. The dimer diol may contain a residual unsaturated bond and trimer triol as an impurity in the molecule. The non-limiting structural formula of the dimer diol is shown below. In the general formulas (1) to (5), the sum of m and n (m + n) is preferably 6 to 17 independently. More preferably, it is 7 to 16. Further, the sum of p and q (p + q) is preferably 8 to 19 and more preferably 9 to 18 independently of each other. The broken line portion in the general formulas (1) to (3) means a carbon-carbon single bond or a carbon-carbon double bond. The broken line portion is preferably a carbon-carbon single bond. The compounds of the general formulas (1) to (5) may be contained alone or may contain two or more kinds.

Examples of the dimer diol component (a2) include, for example, CRODA, trade name Pripol 2033 (mixture of general formula (2), general formula (3) and general formula (5) having a double bond), and prepole 2030 (double). (1) and a mixture of general formulas (4) having no bond), manufactured by BASF Japan, trade names Sobamol 650NS, Sobamol 908, etc. may be mentioned, and these may be used alone or in combination of two or more. You may use them in combination.

By using the component (a2) of the present invention, the polyimide urethane resin (A) can be made less dielectric. The content of the component (a2) is preferably 10% by mass or more, more preferably 20% by mass or more, and further preferably 30% by mass or more in the polyimide urethane resin (A). Further, it is preferably 90% by mass or less, more preferably 80% by mass or less, and further preferably 70% by mass or less. When it is at least the lower limit value, sufficient low dielectric properties are ensured, and when it is at least the upper limit value, heat resistance is improved.

<Isocyanate compound (a3)>
The component (a3) constituting the polyimide urethane resin (A) of the present invention is not particularly limited as long as it is an isocyanate compound (hereinafter, also simply referred to as the component (a3)), for example, an aromatic polyisocyanate compound or an aliphatic poly. Examples thereof include isocyanate compounds and alicyclic polyisocyanate compounds. More preferably, an aromatic diisocyanate compound is used. The aromatic polyisocyanate compound is not particularly limited, and is, for example, diphenylmethane-2,4'-diisocyanate, 3,2'-or 3,3'-or 4,2'-or 4,3'-or 5, 2'-or 5,3'-or 6,2'-or 6,3'-dimethyldiphenylmethane-2,4'-diisocyanate, 3,2'-or 3,3'-or 4,2'-or 4 , 3'-or 5,2'-or 5,3'-or 6,2'-or 6,3'-diethyldiphenylmethane-2,4'-diisocyanate, 3,2'-or 3,3'-or 4,2'-or 4,3'-or 5,2'-or 5,3'-or 6,2'-or 6,3'-dimethoxydiphenylmethane-2,4'-diisocyanate, diphenylmethane-4,4 '-Diisocyanate (MDI), diphenylmethane-3,3'-diisocyanate, diphenylmethane-3,4'-diisocyanate, diphenyl ether-4,4'-diisocyanate, benzophenone-4,4'-diisocyanate, diphenylsulfone-4,4' -Diisocyanate, Trilen-2,4-diisocyanate (TDI), Trilen-2,6-diisocyanate, m-xylylene diisocyanate, p-xylylene diisocyanate, Naphthalene-2,6-diisocyanate, 4,4'-[2 2 Bis (4-phenoxyphenyl) propane] diisocyanate, 3,3'-or 2,2'-dimethylbiphenyl-4,4'-diisocyanate, 3,3'-or 2,2'-diethylbiphenyl-4,4 Examples thereof include'-diisocyanate, 3,3'-dimethoxybiphenyl-4,4'-diisocyanate, 3,3'-diethoxybiphenyl-4,4'-diisocyanate and the like. Considering heat resistance, adhesiveness, solubility, cost, etc., diphenylmethane-4,4'-diisocyanate, tolylen-2,4-diisocyanate, m-xylylene diisocyanate, 3,3'-or 2,2'-Dimethylbiphenyl-4,4'-diisocyanate is preferable, and diphenylmethane-4,4'-diisocyanate and trilen-2,4-diisocyanate are more preferable. In addition, these can be used alone or in combination of two or more. In the present invention, since an isocyanate compound is used, an imide bond can be synthesized in one pot, whereas in a method using a general amine compound, it is necessary to pass through an amic acid (two pots), so that an isocyanate compound is industrially used. The isocyanate method using is advantageous.

The content of the component (a3) is preferably 10% by mass or more, more preferably 20% by mass, and further preferably 30% by mass or more in the polyimide urethane resin (A). Further, it is preferably 70% by mass or less, more preferably 60% by mass or less, and further preferably 50% by mass or less.

The blending amount of the component (a1), the component (a2), and the component (a3) is such that the ratio of the total number of acid anhydride groups + carboxyl groups + hydroxyl groups to the number of isocyanate groups is the number of isocyanate groups / (number of acid anhydride groups + number of carboxyl groups). The number of + hydroxyl groups) is preferably 0.7 to 1.3, and more preferably 0.8 to 1.2. By setting the value to the lower limit or more, the molecular weight of the polyimide urethane resin (A) can be increased, and the coating film can be prevented from becoming brittle. Further, by setting the value to the upper limit or less, the viscosity of the polyimide urethane resin (A) is suppressed, and the leveling property when applying the adhesive solution is improved.

The polymerization reaction of the polyimide urethane resin (A) used in the present invention is carried out by heat-condensing in the presence of one or more kinds of organic solvents while removing carbon dioxide gas freely generated from the reaction system, for example, in the isocyanate method. Is preferable.

As the polymerization solvent, any solvent having low reactivity with the isocyanate group can be used, and for example, a solvent containing no basic compound such as amine is preferable. Examples of such an organic solvent include toluene, xylene, ethylbenzene, nitrobenzene, cyclohexane, isophorone, diethylene glycol dimethyl ether, ethylene glycol diethyl ether, propylene glycol methyl ether acetate, propylene glycol ethyl ether acetate, dipropylene glycol methyl ether acetate, and diethylene glycol. Ethyl ether acetate, methyl methoxypropionate, ethyl methoxypropionate, methyl ethoxypropionate, ethyl ethoxypropionate, ethyl acetate, n-butyl acetate, isoamyl acetate, ethyl lactate, acetone, methyl ethyl ketone, cyclohexanone, N, N-dimethylformamide , N, N-Dimethylacetamide, N-methylpyrrolidone, N-ethylpyrrolidone, γ-butyrolactone, dimethylsulfoxide, chloroform, methylene chloride and the like. These may be used alone or in combination of two or more.

The polymerization solvent is preferably N, N-dimethylacetamide, N-methylpyrrolidone, N-ethylpyrrolidone, γ-butyrolactone, or cyclohexanone because of its volatility during drying, polymer polymerizable property, and good solubility. More preferably, it is N, N-dimethylacetamide. They can also be used as diluents for polyimide urethane adhesive compositions.

The amount of the solvent used is preferably 0.8 to 5.0 times (mass ratio) of the generated polyimide urethane resin (A), and more preferably 1.0 to 3.0 times. By setting the amount used to be equal to or higher than the lower limit, the increase in viscosity during synthesis is suppressed and the stirring property is improved. Further, by setting the value to the upper limit or less, the decrease in the reaction rate can be suppressed.

The reaction temperature is preferably 60 to 200 ° C, more preferably 100 to 180 ° C. The reaction time can be shortened by setting the reaction temperature to the lower limit or higher. Further, by setting the value to the upper limit or less, the decomposition of the monomer component can be suppressed, and the gelation due to the three-dimensional reaction can be further suppressed. The reaction temperature may be carried out in multiple steps. The reaction time can be appropriately selected depending on the scale of the batch and the reaction conditions adopted, particularly the reaction concentration.

Triethylamine, rutidin, picolin, undecene, triethylenediamine (1,4-diazabicyclo [2,2,2] octane), DBU (1,8-diazabicyclo [5,4,0] -7-undecene) to promote the reaction ) Etc., lithium methylate, sodium methylate, sodium ethylate, potassium butoxide, potassium fluoride, sodium fluoride and other alkali metals, alkaline earth metal compounds or titanium, cobalt, tin, zinc, aluminum The reaction may be carried out in the presence of a catalyst such as a metal such as or a semi-metal compound.

<Manufacturing of polyimide urethane resin (A)>
The polyimide urethane resin (A) can be produced by a conventionally known method, and can be obtained, for example, by subjecting a component (a1), a component (a2), and a component (a3) to a condensation reaction (polyimide). Hereinafter, the method for producing the polyimide urethane resin (A) of the present invention will be exemplified, but the present invention is not limited thereto.

After adding the component (a1), the component (a2), the component (a3), the polymerization catalyst, and the polymerization solvent to the reaction vessel and dissolving them, the temperature is 80 to 190 ° C., preferably 100 to 160 ° C. while stirring under a nitrogen stream. After reacting with the above for 6 hours or more, the desired polyimide urethane resin (A) can be obtained by diluting with a polymerization solvent to an appropriate solvent viscosity and cooling.

The polyimide urethane resin (A) of the present invention preferably has a molecular weight corresponding to a logarithmic viscosity of 0.3 to 0.8 dl / g at 30 ° C., and more preferably a logarithm of 0.4 to 0.7 dl / g. It has a molecular weight corresponding to the viscosity. By setting the logarithmic viscosity to the lower limit or more, it is possible to suppress an increase in the functional group concentration and exhibit good dielectric properties. Further, by setting the value to the upper limit or less, it is possible to suppress a decrease in the acid value at which the cross-linking agent (B) is cross-linked.

The acid value of the polyimide urethane resin (A) of the present invention is preferably 60 equivalents / 10 ⁶ g or more, more preferably 80 equivalents / 10 ⁶ g or more, and further preferably 100 equivalents / 10 ⁶ g or more. is there. Further, it is preferably 400 equivalents / 10 ⁶ g or less, more preferably 380 equivalents / 10 ⁶ g or less, and further preferably 360 equivalents / 10 ⁶ g or less. By setting the acid value within the above range, it can be appropriately crosslinked with the cross-linking agent (B), and excellent adhesiveness, humidified solder heat resistance and low dielectric properties can be exhibited.

<Crosslinking agent (B) component>
The cross-linking agent (B) of the present invention is not particularly limited as long as it functions as a cross-linking agent for the polyimide urethane resin (A). It is preferably a compound having two or more functional groups in one molecule, and examples of the functional group include an epoxy group, a carbodiimide group, an isocyanate group, an amino group, a methylol group, an alkoxymethyl group, an imino group and an alidinyl group. .. These cross-linking agents may be used alone or in combination of two or more. Of these, an epoxy group is preferable.

As an example of the cross-linking agent (B), the epoxy resin is not particularly limited as long as it has one or more epoxy groups per molecule. An epoxy resin having two or more epoxy groups per molecule is preferable. For example, it may be modified with silicone, urethane, polyimide, polyamide or the like, or may contain sulfur atoms, nitrogen atoms or the like in the molecular skeleton. Specifically, bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type, or hydrogenated products thereof, glycidyl ether type epoxy resin such as phenol novolac type epoxy resin, cresol novolac type epoxy resin, hexahydro Examples include glycidyl ester-based epoxy resins such as phthalic acid glycidyl ester and dimer acid glycidyl ester, linear aliphatic epoxy resins such as epoxidized polybutadiene and epoxidized soybean oil, and alicyclic epoxy resins such as dicyclopentadiene type epoxy resin. Be done. These may be used alone or in combination of two or more. Further, the solid epoxy resin may be dissolved in an arbitrary solvent and used for compounding, if necessary. A monofunctional epoxy resin having one epoxy group per molecule can be used as a diluent.

Among these cross-linking agents, in order to improve the heat resistance of the humidified solder, it is preferable to increase the cross-linking density of the cured coating film, and a resin having more than 2 cross-linking points in one molecule is preferable. Further, an epoxy resin liquid at room temperature is preferable from the viewpoint of imparting film temporary attachment property of the B-stage adhesive, and as an example, a phenol novolac type epoxy resin such as trade name jER152 manufactured by Mitsubishi Chemical Corporation is particularly preferable. Further, it is preferable that the resin has an alicyclic skeleton in the structure and is excellent in low dielectric properties, and as an example, a dicyclopentadiene type epoxy such as the trade name HP-7200H manufactured by DIC Corporation is particularly preferable.

The content of the cross-linking agent (B) of the present invention is preferably 5 parts by mass or more, more preferably 8 parts by mass or more, and further preferably 10 parts by mass with respect to 100 parts by mass of the polyimide urethane resin (A). It is more than a part by mass. Further, it is preferably 30 parts by mass or less, more preferably 25 parts by mass or less, and further preferably 20 parts by mass or less. A sufficient cross-linking density can be obtained by setting the value to the lower limit value or more, and the heat resistance of the humidified solder is improved by setting the value to the upper limit value or less so that the epoxy resin does not remain excessively. If an excessive amount of epoxy resin remains, hydroxyl groups are generated from the epoxy groups during curing, which may adversely affect the dielectric properties.

The total amount of the polyimide urethane resin (A) and the cross-linking agent (B) in the solid content of the polyimide urethane adhesive composition is preferably 60% by mass or more. It is more preferably 70% by mass or more, further preferably 80% by mass or more, particularly preferably 90% by mass or more, and may be 100% by mass or more. Within the above range, excellent adhesiveness, humidifying solder heat resistance and low dielectric properties can be exhibited.

<Other ingredients>
A flame retardant may be added to the polyimide urethane adhesive composition of the present invention, if necessary, as long as the effects of the present invention are not impaired. Examples of the flame retardant include bromine-based, phosphorus-based, nitrogen-based, and metal hydroxide compounds. Of these, phosphorus-based flame retardants are preferable, and examples thereof include phosphoric acid esters such as trimethyl phosphate, triphenyl phosphate, and tricresyl phosphate. Further, for example, a phosphate such as aluminum phosphinate or a known phosphorus-based flame retardant such as phosphazene can be used. Further, a phosphorus-based flame retardant having a phenolic hydroxyl group or the like may be used. When a phosphorus-based flame retardant having a phenolic hydroxyl group or the like is used in combination, the compound having a phenolic hydroxyl group acts as a thermosetting agent for the cross-linking agent (B), similarly to the polyimide urethane resin (A). Therefore, it is possible to increase the crosslink density of the coating film after thermosetting to improve the heat resistance of the humidified solder and the insulation reliability.

These flame retardants may be used alone or in combination of two or more. When the flame retardant is contained, the flame retardant is preferably contained in the range of 1 to 200 parts by mass, more preferably 5 to 150 parts by mass, and 10 to 10 parts by mass with respect to 100 parts by mass of the polyimide urethane resin (A). The range of 100 parts by mass is more preferable. When it is at least the above lower limit value, good flame retardancy can be exhibited, and when it is at least the above upper limit value, good adhesiveness, humidifying solder heat resistance and dielectric properties can be exhibited.

In addition to the polyimide urethane resin (A) and the cross-linking agent (B), the polyimide urethane adhesive composition of the present invention is cured in order to further improve properties such as adhesiveness, chemical resistance, and heat resistance. An accelerator (polymerization catalyst) can be added. The curing accelerator used in the present invention is not particularly limited as long as it can accelerate the curing reaction of the above-mentioned polyimide urethane resin (A) and cross-linking agent (B).

Specific examples of such a curing accelerator include imidazole derivatives, guanamines such as acetoguanamine and benzoguanamine, diaminodiphenylmethane, m-phenylenediamine, m-xylenediamine, diaminodiphenylsulfone, diocyandiamide, urea, urea derivatives and melamine. , Polyamines such as polybasic hydrazides, their organic acid salts and / or epoxy adducts, amine complexes of boron trifluoride, ethyldiamino-S-triazine, 2,4-diamino-S-triazine, 2,4-diamino Triazine derivatives such as -6-xylyl-S-triazine, trimethylamine, triethanolamine, N, N-dimethyloctylamine, N-benzyldimethylamine, pyridine, N-methylmorpholin, hexa (N-methyl) melamine, 2 , 4,6-Tris (dimethylaminophenol), tetramethylguanidine, DBU (1,8-diazabicyclo [5,4,0] -7-undecene), DBN (1,5-diazabicyclo [4,3,0] Tertiary amines such as -5-nonen), organic acid salts thereof and / or organic phosphines such as tetraphenylboroate, polyvinylphenol, polyvinylphenol bromide, tributylphosphine, triphenylphosphine, tris-2-cyanoethylphosphine, etc. , Tri-n-butyl (2,5-dihydroxyphenyl) phosphonium bromide, hexadecyltributylphosphonium chloride, tetraphenylphosphonium tetraphenylboroate and other quaternary phosphonium salts, benzyltrimethylammonium chloride, phenyltributylammonium chloride and the like. Photocationic polymerization catalysts such as class ammonium salts, the polycarboxylic acid anhydride, diphenyliodonium tetrafluoroboroate, triphenylsulfonium hexafluoroantimonate, 2,4,6-triphenylthiopyrylium hexafluorophosphate, styrene-anhydrous. Examples thereof include an equimolar reaction product of maleic acid resin, phenylisocyanate and dimethylamine, and an equimolar reaction product of organic polyisocyanate such as tolylene diisocyanate and isophorone diisocyanate and dimethylamine. These may be used alone or in combination of two or more types. A curing accelerator having latent curability is preferable, and examples thereof include organic acid salts of DBU and DBN and / or tetraphenylboroate, and photocationic polymerization catalysts.

The amount of the curing accelerator used is preferably 0 to 20 parts by mass with respect to 100 parts by mass of the polyimide urethane resin (A). By setting the content to 20 parts by mass or less, it is possible to suppress a decrease in storage stability and humidification solder heat resistance of the polyimide urethane adhesive composition.

The polyimide urethane adhesive composition of the present invention is phenolic for the purpose of increasing the crosslink density of the coating film after thermosetting and improving the insulation reliability and the heat resistance of the humidified solder as long as the effects of the present invention are not impaired. A compound having a hydroxyl group can be added. The compound having a phenolic hydroxyl group is not particularly limited as long as it contains a phenolic hydroxyl group in its structure.

The blending amount of the compound having a phenolic hydroxyl group is preferably 3 to 20 parts by mass with respect to 100 parts by mass of the polyimide urethane resin (A). The effect of improving the crosslink density can be obtained by containing 3 parts by mass or more, and the embrittlement of the B stage sheet can be suppressed by containing 20 parts by mass or less.

A highly heat-resistant resin can be added to the polyimide urethane adhesive composition of the present invention for the purpose of suppressing outflow during thermocompression bonding as long as the effects of the present invention are not impaired. The highly heat-resistant resin is preferably a resin having a glass transition temperature of 160 ° C. or higher. Specific examples thereof include, but are not limited to, a polyimide resin, a polyetherimide resin, and a polyetheretherketone resin. Further, the highly heat-resistant resin is preferably dissolved in a solvent. As a resin satisfying these conditions, a resin in which the anhydride content of the polycarboxylic acid having an aromatic ring is 90 mol% or more is preferable when the structural unit derived from the total acid component is 100 mol%. The blending amount of these highly heat-resistant resins is preferably 5 to 60 parts by mass, and more preferably 6 to 50 parts by mass with respect to 100 parts by mass of the polyimide urethane resin (A). If the blending amount is too small, it is difficult to obtain the effect of suppressing the outflow, and if it is too large, the temporary attachment property of the B stage adhesive sheet and the adhesiveness may be lowered.

In addition to the above-mentioned cross-linking agent (B), glycidylamine can be added to the polyimide urethane adhesive composition of the present invention for the purpose of reducing the outflow of the adhesive during lamination as long as the effects of the present invention are not impaired. .. The amount of glycidylamine to be added is preferably 0.01 to 5% by mass, preferably 0.05 to 2% by mass, based on the total mass of the polyimide urethane resin (A) and the cross-linking agent (B) in the adhesive composition. Is even more preferable. If the amount of glycidylamine added is too large, the fluidity of the adhesive composition at the time of laminating becomes too small and the embedding property of the circuit may be deteriorated, and if the amount added is too small, a sufficient flow-out suppressing effect can be obtained. It may not be possible. The glycidylamine may be used alone or in combination of two or more.

An acid-modified polyolefin can be added to the polyimide urethane adhesive composition of the present invention for the purpose of exhibiting low dielectric properties without impairing the effects of the present invention.

The amount of the acid-modified polyolefin added is preferably 5 to 20 parts by mass with respect to 100 parts by mass of the polyimide urethane resin (A). If it is less than 5 parts by mass, it is difficult to obtain the effect of improving the dielectric properties, and if it exceeds 20 parts by mass, the compatibility with the polyimide urethane resin is poor, and there is a concern that a uniform solution cannot be obtained.

A silane coupling agent can be added to the polyimide urethane adhesive composition of the present invention for the purpose of improving adhesiveness, and the silane coupling agent is not particularly limited as long as it is a conventionally known silane coupling agent. Specific examples thereof include aminosilane, mercaptosilane, vinylsilane, epoxysilane, methacrylsilane, isocyanatesilane, ketiminesilane, a mixture or reactant thereof, or a compound obtained by reacting these with polyisocyanate. Examples of such a silane coupling agent include 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropylmethyldimethoxysilane, 3-aminopropylethyldiethoxysilane, and bistrimethoxysilylpropylamine. , Bistriethoxysilylpropylamine, Bismethoxydimethoxysilylpropylamine, Bisethoxydiethoxysilylpropylamine, N-2- (aminoethyl) -3-aminopropyltrimethoxysilane, N-2- (aminoethyl) -3- Aminosilanes such as aminopropylmethyldimethoxysilane, N-2- (aminoethyl) -3-aminopropyltriethoxysilane, N-2- (aminoethyl) -3-aminopropylethyldiethoxysilane, γ-mercaptopropyltrimethoxy Mercaptosilanes such as silane, γ-mercaptopropyltriethoxysilane, γ-mercaptopropylmethyldimethoxysilane, γ-mercaptopropylmethyldiethoxysilane, γ-mercaptopropylethyldiethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, Vinyl silanes such as tris- (2-methoxyethoxy) vinyl silane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyldimethylethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, β- (3,4) -Epoxycyclohexyl) ethylmethyldimethoxysilane, γ-glycidoxypropyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane and other epoxysilanes, 3-methacryloxypropylmethyldimethoxysilane, 3-methacry Methacrylic silanes such as loxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane, isocyanatesilanes such as isocyanatepropyltriethoxysilane and isocyanatepropyltrimethoxysilane, ketiminated propyltrimethoxy Examples thereof include ketimine silanes such as silane and ketiminated propyltriethoxysilane, and these may be used alone or in combination of two or more. Of these silane coupling agents, epoxysilane has a reactive epoxy group, so that it can react with a polyimide urethane resin, which is preferable in terms of improving heat resistance and moisture heat resistance. The blending amount of the silane coupling agent is preferably 0 to 10% by mass, more preferably 0 to 5% by mass, when the total non-volatile content of the adhesive composition is 100% by mass. If the blending amount exceeds the above range, the heat resistance of the humidified solder may decrease.

An organic / inorganic filler can be added to the polyimide urethane adhesive composition of the present invention for the purpose of improving the heat resistance of the humidified solder as long as the effects of the present invention are not impaired. Examples of the inorganic filler include silica (SiO ₂ ), alumina (Al ₂ O ₃ ), titania (TIO ₂ ), tantalum oxide (Ta ₂ O ₅ ), zirconia (ZrO ₂ ), and silicon nitride (Si ₃ N ₄ ). , Barium titanate (BaO · TiO ₂ ), barium carbonate (BaCO ₃ ), lead titanate (PbO · TiO ₂ ), lead zirconate titanate (PZT), lead lanthanum nitrite (PLZT), gallium oxide Ga ₂ O _3), spinel _{(MgO · Al 2 O 3)} , mullite _{(3Al 2 O 3 · 2SiO 2} ), cordierite _{(2MgO · 2Al 2 O 3 ·} 5SiO 2), talc (3MgO · 4SiO ₂ · H ₂ O), aluminum titanate _{(TiO 2 -Al 2 O 3)} , yttria-containing zirconia _{(Y 2 O 3 -ZrO 2)} , barium silicate (BaO · 8SiO _2), boron nitride (BN), calcium carbonate (CaCO ₃ ), Calcium sulfate (CaSO ₄ ), Zirconium oxide (ZnO), Magnesium titanate (MgO / TiO ₂ ), Barium sulfate (BaSO ₄ ), Organic bentonite, Carbon (C), Organic smectite, etc. These can be used alone or in combination of two or more.

The inorganic filler used in the present invention preferably has an average particle diameter of 50 μm or less and a maximum particle diameter of 100 μm or less, more preferably an average particle diameter of 20 μm or less, and most preferably an average particle diameter of 10 μm or less. The average particle diameter (median diameter) referred to here is a value obtained on a volume basis using a laser diffraction / scattering type particle size distribution measuring device. If the average particle size exceeds 50 μm, the B-stage adhesive film may become embrittled or the appearance may be poor.

Examples of the organic filler used in the present invention include polyimide resin particles, benzoguanamine resin particles, epoxy resin particles and the like.

The polyimide urethane adhesive composition of the present invention contains a silicone-based, fluorine-based, polymer-based defoaming agent for the purpose of improving leveling property and defoaming property at the time of application without impairing the effect of the present invention. , A leveling agent can be added.

<Polyimide urethane adhesive composition (adhesive)>
The polyimide urethane adhesive composition (adhesive) of the present invention is a composition containing at least the above-mentioned polyimide urethane resin (A) component and the cross-linking agent (B) component.

The cured product of the polyimide urethane adhesive composition preferably has a dielectric loss tangent of 0.01 or less at a frequency of 10 GHz. It is more preferably 0.008 or less, still more preferably 0.007 or less. The lower limit is not particularly limited, and if it is 0.0002 or more, there is no problem in practical use. When it is within the above range, excellent dielectric properties can be exhibited. The relative permittivity of the cured product is preferably 3.0 or less, more preferably 2.8 or less, and even more preferably 2.6 or less. The lower limit is not particularly limited, and if it is 2.0 or more, there is no problem in practical use. When it is within the above range, excellent dielectric properties can be exhibited. The curing condition of the polyimide urethane adhesive composition is 150 ° C. for 4 hours.

The cured product of the polyimide urethane adhesive composition preferably has a strength of 0.3 N / mm or more in an adhesive strength test described later. It is more preferably 0.5 or more, still more preferably 0.7 N / mm or more. The upper limit is not particularly limited, but there is no practical problem if it is 2.0 N / mm or less. Within the above range, excellent adhesive strength can be exhibited.

<Adhesive solution>
The adhesive solution is a solution of the polyimide urethane adhesive composition (A) of the present invention in the polymerization solvent. The viscosity of the adhesive solution on the B-type viscometer is preferably in the range of 3 dPa · s to 40 dPa · s at 25 ° C., and more preferably in the range of 4 dPa · s to 30 dPa · s. If the viscosity is less than the above range, the amount of the solution flowing out during coating tends to be large, and the film thickness tends to be thin. If the viscosity exceeds the above range, the leveling property to the substrate tends to decrease during coating.

<Adhesive film>
For the adhesive solution, for example, the solvent can be distilled off as follows to obtain an adhesive film. That is, the above-mentioned adhesive solution is applied to the release film with a film thickness of 5 to 80 μm by a method such as a screen printing method, a spray method, a roll coating method, an electrostatic coating method, a curtain coating method, etc. Dry at ~ 150 ° C. for 3-10 minutes to distill off the solvent. Drying may be in the air or in an inert atmosphere.

Further, for the purpose of adjusting the fluidity of the polyimide urethane adhesive composition during thermocompression bonding, heat treatment may be performed after solvent drying to partially react the polyimide urethane resin (A) with the cross-linking agent (B). The state before thermocompression bonding is called a B stage.

Examples of the part where the adhesive is used in the FPC include a CL film, an adhesive film, and a three-layer copper-clad laminate.

In CL films and adhesive films, it is common to perform processing such as winding, storage, cutting, and punching in the B stage state, and flexibility in the B stage state is also required. On the other hand, in a three-layer copper-clad laminate, it is common to perform thermocompression bonding and thermosetting immediately after forming the B stage state.

Further, in any of the above applications, the adhesive film in the B stage state is thermocompression bonded to the adherend and subjected to thermosetting treatment before use.

The CL film is composed of an insulating plastic film / adhesive layer or an insulating plastic film / adhesive layer / protective film. The insulating plastic film is a film having a thickness of 1 to 200 μm made of a plastic such as polyimide, polyimide urethane, polyester, polyphenylene sulfide, polyethersulfone, polyetheretherketone, aramid, polycarbonate, polyallylate, etc., and is selected from these. A plurality of films may be laminated. The protective film is not particularly limited as long as it can be peeled off without impairing the properties of the adhesive, but for example, plastics such as polyethylene, polypropylene, polyolefin, polyester, polymethylpentene, polyvinyl chloride, polyvinylidene fluoride, and polyphenylene sulfide. Examples thereof include films, films coated with silicone, fluoride or other release agents, papers laminated with these, and papers impregnated or coated with a peelable resin.

The adhesive film has a structure in which a protective film is provided on at least one side of an adhesive layer made of a polyimide urethane adhesive composition, and is composed of a protective film / adhesive layer or a protective film / adhesive / protective film. An insulating plastic film layer may be provided in the adhesive layer. The adhesive film can be used for multilayer printed circuit boards.

The three-layer copper-clad laminate has a structure in which a copper foil is bonded to at least one side of an insulating plastic film with a polyimide urethane adhesive composition. The copper foil is not particularly limited, but rolled copper foil and electrolytic copper foil conventionally used for flexible printed wiring boards can be used.

The polyimide urethane resin layer of FPC thus obtained becomes a solder resist layer, a surface protective layer, an interlayer insulating layer or an adhesive layer of a flexible printed wiring board. As described above, the polyimide urethane resin composition of the present invention is useful as a film forming material for semiconductor elements, overcoat inks for various electronic components, solder resist inks, interlayer insulating films, paints, coating agents, adhesives and the like. Can also be used as. Here, the solder resist layer is a film formed on the entire surface of the circuit conductor excluding the soldered portion, so that when electronic components are wired to the printed wiring board, the solder adheres to unnecessary portions. It is used as a protective film to prevent the circuit from being directly exposed to the air. The surface protective layer is attached to the surface of a circuit member and used to mechanically and chemically protect the electronic member from the processing process and the usage environment. The interlayer insulating layer is used to prevent energization between layers in the package substrate on which fine wiring is formed. The adhesive layer is mainly used when the metal layer and the film layer are bonded and bonded.

In order to explain the present invention more specifically, examples are given below, but the present invention is not limited thereto. The characteristic values in the examples were evaluated by the following methods.

<Logarithmic viscosity (η)>
The polyimide urethane resin (A) was dissolved in N, N-dimethylacetamide so that the polymer concentration was 0.6 g / dl. The solution viscosity and solvent viscosity of the solution were measured at 30 ° C. with an Ubbelohde type viscosity tube, and calculated by the following formula.
Logarithmic viscosity (dl / g) = [ln (V1 / V2)] / V3
V1: Calculated from the time when the solvent (N, N-dimethylacetamide) passes through the capillary of the Ubbelohde viscous tube V2: Calculated from the time when the polymer solution passes through the capillary of the Ubbelohde viscous tube V3: Polymer concentration (g / dl)

<Acid value (AV)>
Dissolving a polyimide urethane resin (A) 0.2 g in N- methylpyrrolidone 20 ml, was titrated with potassium hydroxide solution in ethanol 0.1 N, (A) a carboxyl group equivalent per component 10 ⁶ g (equivalents / 10 ⁶ g) was calculated.

<Adhesive strength>
The adhesive solution is applied to a polyimide (PI) film (trade name: Kapton EN50 manufactured by Toray DuPont) so that the thickness after drying is 25 μm, dried at 140 ° C. for 3 minutes in a hot air dryer, and in a B stage state. An adhesive film was obtained. The adhesive-coated surface of the adhesive film in the B-stage state and the glossy surface of the copper foil (BHY thickness 18 μm manufactured by JX Nippon Oil) are thermocompression-bonded at 160 ° C., 3 MPa, and under reduced pressure for 30 seconds with a vacuum press laminating machine. Then, it was heat-cured at 150 ° C. for 4 hours. The cured laminate (PI film / adhesive layer / copper foil) was subjected to a polyimide film in a 90 ° direction of 50 mm / in an atmosphere of 25 ° C using a tensile tester (Shimadzu Autograph AG-X plus). It was peeled off at a speed of min, and the adhesive strength was measured.

<Humidifying solder heat resistance>
A laminate (PI film / adhesive layer / copper foil) that was heat-cured in the same manner as the adhesiveness evaluation was prepared, cut into 20 mm squares, and allowed to stand in an environment of a temperature of 40 ° C. and a humidity of 80% RH for 2 days. , The film was floated in a solder bath at a predetermined temperature for 30 seconds with the polyimide side facing up. Specifically, it was floated at 260 ° C. for 30 seconds, and if there was no swelling or peeling, it was floated at 280 ° C. for 30 seconds as the next step. If there was no swelling or peeling even at this temperature, the next step was to float at 300 ° C. for 30 seconds. If there was swelling or peeling, it was stopped at that temperature.
Evaluation criteria ◎: No swelling or peeling at 300 ° C for 30 seconds.
◯: No swelling or peeling at 280 ° C. × 30 seconds, but swelling or peeling at 300 ° C. × 30 seconds.
Δ: No swelling or peeling at 260 ° C. × 30 seconds, but swelling or peeling at 280 ° C. × 30 seconds.
X: There is swelling or peeling at 260 ° C. × 30 seconds.

Ｖ：体積 ｆ：共振周波数 Ｑ：Ｑ値
インデックスｃ：空の空洞共振器の場合
インデックスｓ：サンプルが装着された場合<Relative permittivity / dielectric loss tangent>
The adhesive solution is applied to a polytetrafluoroethylene (PTFE) sheet (Skived Tape MSF-100 manufactured by Chuko Kasei Co., Ltd., relative permittivity 2.07 at 10 GHz, dielectric loss tangent 0.0025), and applied at 140 ° C. for 3 minutes. After drying, it was cured at 150 ° C. for 4 hours to obtain a cured product sheet having a thickness of 25 μm. Next, the relative permittivity and dielectric loss tangent at 10 GHz of the cured product sheet were measured using a commercially available permittivity measuring device (cavity resonator type, ShockLine VNA series MS46122B manufactured by Anritsu Co., Ltd.). The measurement was carried out with the cured product sheet as it was without peeling the PTFE sheet. The relative permittivity and dielectric loss tangent of only the PTFE sheet were separately measured, and the measured value of PTFE was subtracted from the measured value of the cured product sheet. The relative permittivity and dielectric properties obtained by the cavity resonator method were obtained by the following equations.

V: Volume f: Resonance frequency Q: Q value Index c: In the case of an empty cavity resonator Index s: When a sample is mounted

Manufacturing example 1
Trimellitic anhydride (manufactured by Polynt) 37.0 g, dimerdiol (manufactured by CRODA, trade name Pripol 2033) 80.4 g, as an isocyanate component 4,4'-diphenylmethane diisocyanate (MDI) (manufactured by Tosoh, trade name Millionate MT) 83. 4 g was placed in a flask and dissolved in 275.7 g of N, N-dimethylacetamide. Then, after reacting at 140 ° C. for 6 hours with stirring under a nitrogen stream, 153.2 g of N, N-dimethylacetamide was added to dilute the mixture, and the mixture was cooled to room temperature to obtain 30% by mass of non-volatile content (solid content). , A brown and viscous polyimide urethane resin solution (A-1) having an acid value of 325 [equivalent / 10 ⁶ g] and a logarithmic viscosity of 0.540 [dl / g] was obtained.

Manufacturing example 2
Trimellitic acid anhydride (manufactured by Polynt) 16.0 g, 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] propanoic acid dianhydride (trade name BisDA1000 manufactured by SABIC) 43.3 g, dimerdiol 95.2 g (CRODA trade name Pripole 2033) and 83.4 g of 4,4'-diphenylmethane diisocyanate (MDI) (Tosoh trade name Millionate MT) as an isocyanate component are placed in a flask, and N, N-dimethylacetamide 334.8 g. Dissolved in. Then, after reacting by the method described in Production Example 1, 186.0 g of N, N-dimethylacetamide was added to dilute the mixture, and the mixture was cooled to room temperature to obtain 30% by mass of non-volatile content (solid content) and an acid value of 149 [. A brown and viscous polyimide urethane resin solution (A-2) having an equivalent value of 10 ⁶ g] and a logarithmic viscosity of 0.433 [dl / g] was obtained.

Manufacturing example 3
2,2-Bis [4- (3,4-dicarboxyphenoxy) phenyl] propanoic anhydride (SABIC product name BisDA1000) 57.3 g, dimerdiol (CRODA product name Pripol 2033) 79.8 g, isocyanate As a result, 62.6 g of 4,4'-diphenylmethane diisocyanate (MDI) (trade name: Millionate MT manufactured by Tosoh) was placed in a flask and dissolved in 284.9 g of N, N-dimethylacetamide. Thereafter, those were allowed to react in the manner described in Preparation Example 1, N, N-dimethylacetamide 158.3g diluted by adding, by cooling to room temperature, non-volatile content of 30%, acid value 162 [eq / 10 ⁶ A brown and viscous polyimide urethane resin solution (A-3) having a logarithmic viscosity of 0.484 [dl / g] was obtained.

Manufacturing example 4
Trimellitic acid anhydride (manufactured by Polynt) 26.9 g, dimerdiol (manufactured by CRODA, trade name Pripol 2033) 110.2 g, and 4,4'-diphenylmethane diisocyanate (MDI) (manufactured by Tosoh, trade name Millionate MT) 83. 4 g was placed in a flask and dissolved in 312.3 g of N, N-dimethylacetamide. Thereafter, those were allowed to react in the manner described in Preparation Example 1, N, N-dimethylacetamide 173.5g diluted by adding, by cooling to room temperature, non-volatile content of 30%, acid value 130 [eq / 10 ⁶ A brown and viscous polyimide urethane resin solution (A-4) having a logarithmic viscosity of 0.470 [dl / g] was obtained.

Production example 5
Trimellitic acid anhydride (manufactured by Polynt) 14.5 g, dimerdiol (manufactured by CRODA, trade name Pripol 2033) 146.9 g, as an isocyanate component 4,4'-diphenylmethane diisocyanate (MDI) (manufactured by Tosoh, trade name Millionate MT) 83. 4 g was placed in a flask and dissolved in 357.2 g of N, N-dimethylacetamide. Thereafter, those were allowed to react in the manner described in Preparation Example 1, N, N-dimethylacetamide 198.5g diluted by adding, by cooling to room temperature, non-volatile content of 30%, acid value 106 [eq / 10 ⁶ A brown and viscous polyimide urethane resin solution (A-5) having a logarithmic viscosity of 0.460 [dl / g] was obtained.

Production example 6
Trimellitic anhydride (manufactured by Polynt) 37.0 g, dimerdiol (manufactured by CRODA, trade name Pripol 2030) 80.4 g, as an isocyanate component 4,4'-diphenylmethane diisocyanate (MDI) (manufactured by Tosoh, trade name Millionate MT) 83. 4 g was placed in a flask and dissolved in 275.7 g of N, N-dimethylacetamide. Then, after reacting by the method described in Production Example 1, 153.2 g of N, N-dimethylacetamide was added to dilute the mixture, and the mixture was cooled to room temperature to have a non-volatile content of 30% by mass and an acid value of 270 [equivalent / 10 ^6]. A brown and viscous polyimide urethane resin solution (A-6) having a logarithmic viscosity of 0.584 [dl / g] was obtained.

Production example 7
Trimellitic anhydride (manufactured by Polynt) 26.9 g, dimerdiol (manufactured by CRODA, trade name Pripol 2030) 110.2 g, 4,4'-diphenylmethane diisocyanate (MDI) as an isocyanate component (manufactured by Tosoh, trade name Millionate MT) 83. 4 g was placed in a flask and dissolved in 312.3 g of N, N-dimethylacetamide. Then, after reacting by the method described in Production Example 1, 173.5 g of N, N-dimethylacetamide was added to dilute the mixture, and the mixture was cooled to room temperature to have a non-volatile content of 30% by mass and an acid value of 177 [equivalent / 10 ^6]. A brown and viscous polyimide urethane resin solution (A-7) having a logarithmic viscosity of 0.560 [dl / g] was obtained.

Production Example 8
Trimellitic anhydride (manufactured by Polynt) 14.5 g, dimerdiol (manufactured by CRODA, trade name Pripol 2030) 146.9 g, 4,4'-diphenylmethane diisocyanate (MDI) as an isocyanate component (manufactured by Tosoh, trade name Millionate MT) 83. 4 g was placed in a flask and dissolved in 357.2 g of N, N-dimethylacetamide. Thereafter, those were allowed to react in the manner described in Preparation Example 1, N, N-dimethylacetamide 198.5g diluted by adding, by cooling to room temperature, non-volatile content of 30%, acid value 133 [eq / 10 ⁶ A brown and viscous polyimide urethane resin solution (A-8) having a logarithmic viscosity of 0.490 [dl / g] was obtained.

Manufacturing example 9
Trimellitic anhydride (manufactured by Polynt) 50.0 g, dimerdiol (manufactured by CRODA, trade name Pripol 2033) 79.8 g, tolylene diisocyanate (TDI) (manufactured by Tosoh, trade name Coronate T-80) 69.7 g. It was placed in a flask and dissolved in 264.8 g of N, N-dimethylacetamide. Thereafter, those were allowed to react in the manner described in Preparation Example 1, N, N-dimethylacetamide 147.1g diluted by adding, by cooling to room temperature, non-volatile content of 30%, acid value 203 [eq / 10 ⁶ A brown and viscous polyimide urethane resin solution (A-9) having a logarithmic viscosity of 0.504 [dl / g] was obtained.

Production Example 10
4,4'-(Hexafluoroisopropylidene) diphthalic anhydride (6FDA) (manufactured by Daikin) 46.6 g, dimerdiol (trade name Pripol 2033 manufactured by CRODA) 111.2 g, 4,4'-diphenylmethane diisocyanate as an isocyanate component 75.1 g of (MDI) (trade name: Millionate MT manufactured by Tosoh) was placed in a flask and dissolved in 378.6 g of N-methyl-2-pyrrolidone. Thereafter, those were allowed to react in the manner described in Production Example 1, it was diluted with cyclohexanone 210.4G, by cooling to room temperature, non-volatile content of 30%, acid value 203 [eq / 10 6 ^g], inherent viscosity A brown and viscous polyimide urethane resin solution (A-10) of 0.643 [dl / g] was obtained.

Production Example 11
2,2-Bis [4- (3,4-dicarboxyphenoxy) phenyl] propanoic acid dianhydride (manufactured by SABIC, trade name BisDA1000) 12.5 g, p-phenylene bis (trimeritate anhydride) (TAHQ) (manufactured by Manac) ) 11.0 g, dimerdiol (CRODA trade name Pripol 2033) 63.8 g, and 4,4'-diphenylmethane diisocyanate (MDI) (Tosoh trade name Millionate MT) 40.0 g as an isocyanate component are placed in a flask and N- It was dissolved in 184.7 g of methyl-2-pyrrolidone. Thereafter, those were allowed to react in the manner described in Production Example 1, it was diluted with cyclohexanone 148.2 g, by cooling to room temperature, non-volatile content of 30%, acid value 620 [eq / 10 6 ^g], inherent viscosity A brown and viscous polyimide urethane resin solution (A-11) of 0.531 [dl / g] was obtained.

Comparative manufacturing example 1
Trimellitic acid anhydride (manufactured by Polynt) 8.3 g, NBR (manufactured by PIT Japan trade name CTBN 1300 x 13NA) 140.0 g, 4,4'-diphenylmethane diisocyanate (MDI) as an isocyanate component (trade name Millionate MT manufactured by Tosoh) 20.9 g was placed in a flask and dissolved in 248.0 g of N, N-dimethylacetamide. Thereafter, those were allowed to react in the manner described in Preparation Example 1, N, N-dimethylacetamide 137.8g diluted by adding, by cooling to room temperature, non-volatile content of 30%, acid value 440 [eq / 10 ⁶ A brown and viscous polyimide urethane resin solution (A-12) having a logarithmic viscosity of 0.600 [dl / g] was obtained.

Comparative manufacturing example 2
Trimellitic acid anhydride (manufactured by Polynt) 36.8 g, dimer acid (manufactured by CRODA, trade name Pripol 1004) 80.2 g, 4,4'-diphenylmethane diisocyanate (MDI) as an isocyanate component (manufactured by Tosoh, trade name Millionate MT) 83. 4 g was placed in a flask and dissolved in 256.6 g of N, N-dimethylacetamide. Then, after reacting by the method described in Production Example 1, 142.6 g of N, N-dimethylacetamide was added to dilute the mixture, and the mixture was cooled to room temperature to have a non-volatile content of 30% by mass and an acid value of 288 [equivalent / 10 ^6]. A brown and viscous polyimide urethane resin solution (A-13) having a logarithmic viscosity of 0.610 [dl / g] was obtained.

Comparative manufacturing example 3
Trimellitic anhydride (manufactured by Polynt) 55.2 g, dimer ester (manufactured by CRODA, trade name Preplast 3199) 92.3 g, as an isocyanate component 4,4'-diphenylmethane diisocyanate (MDI) (manufactured by Tosoh, trade name Millionate MT) 83. 4 g was placed in a flask and dissolved in 308.5 g of N, N-dimethylacetamide. Then, after reacting by the method described in Production Example 1, 171.4 g of N, N-dimethylacetamide was added to dilute the mixture, and the mixture was cooled to room temperature to have a non-volatile content of 30% by mass and an acid value of 287 [equivalent / 10 ^6]. A brown and viscous polyimide urethane resin solution (A-14) having a logarithmic viscosity of 0.410 [dl / g] was obtained.

Details of Production Examples 1 to 11 and Comparative Production Examples 1 to 3 are shown in Table 1. The numerical values described in the raw material line indicate the molar ratio (mol%) of each component in the resin, and the numbers in parentheses indicate the mass ratio (mass%).

Subsequently, the polyimide urethane resin (A) and the cross-linking agent (B) were mixed according to the blending ratios shown in Table 2, an adhesive solution was prepared, and the above characteristics were evaluated. The numerical values shown in the rows of the polyimide urethane resin and the epoxy resin shown in Table 2 represent mass fractions [mass%] with respect to the resin content.

The cross-linking agent (B) used in Table 2 is as follows.
jER152: Phenolic novolac type epoxy resin (manufactured by Mitsubishi Chemical Corporation)
HP-7200H: Dicyclopentadiene type epoxy resin (manufactured by DIC)

As is clear from Table 2, Examples 1 to 18 were excellent in dielectric properties, adhesive strength, and heat resistance to humidified solder, and were able to achieve both low dielectric properties and adhesive strength.

On the other hand, Comparative Example 1 was excellent in adhesive strength and heat resistance of humidified solder, but had poor dielectric properties. Comparative Example 2 was excellent in dielectric properties, but had poor adhesive strength. Comparative Example 3 had poor dielectric properties and adhesive strength.

As described above, the polyimide urethane adhesive of the present invention is excellent in low dielectric properties while having adhesiveness and heat resistance to humidified solder, and is therefore particularly suitable for use in electronic parts having an interlayer insulating layer or an adhesive layer. is there. Therefore, it can be used in a wide range of fields of electronic devices as an adhesive for various electronic parts such as flexible printed wiring boards, and is expected to greatly contribute to the industrial world.

Claims (6)

A polyimide urethane resin (A) containing a polycarboxylic acid derivative component (a1) having an acid anhydride group, a dimerdiol component (a2), and an isocyanate component (a3) as copolymerization components. A polyimide urethane adhesive composition containing the polyimide urethane resin (A) and the cross-linking agent (B) according to claim 1. The polyimide urethane adhesive composition according to claim 1, wherein the cross-linking agent (B) is an epoxy resin. The polyimide urethane adhesive composition according to claim 2 or 3, further containing an organic solvent. A laminate containing a cured product of the polyimide urethane adhesive composition according to claim 2 or 3. A flexible printed wiring board including the laminated body of claim 5 as a component.