TWI798378B - functional components - Google Patents

Abstract

The purpose of the present invention is to improve the adhesion between the substrate (10) and the easy-adhesive layer (20) and the adhesion between the easy-adhesive layer (20) and the functional layer (30), even in harsh environments such as high temperature and high humidity It can also maintain sufficient adhesion even after being exposed for a long time. In order to achieve this goal, the functional component of the present invention is a functional component that is laminated on at least one side of the substrate (10) in the order of the easy-bonding layer (20) and the functional layer (30), forming the aforementioned easy-bonding layer (20) The composition used includes a polyester-acrylic composite resin with a glycidyl group, and the acid value of the solid content of the composition is 2.5~6.0mgKOH/g, and the composition used to form the aforementioned functional layer (30) includes A compound having a glycidyl group and a reactive functional group, and the acid value of the solid component of the composition is 4.0 mgKOH/g or less.

Description

functional components

The present invention relates to functional components, films, sheets, etc., which are sequentially laminated with substrates, easy-adhesive layers, and functional layers. More specifically, the present invention relates to maintaining Sufficient adhesion of functional components, films, sheets, etc.

Plastic materials are widely used as materials for electronic devices because of their light weight, processing suitability, and productivity. Plastic materials may also be used as a single substance, but in most cases, a functional layer with a specific function is added to the surface layer, and a function according to the application is added. Especially in recent years, instead of glass or metal materials, plastic materials are used in fields that have not been used before. Along with this, plastic materials are also required to have high interlayer adhesion stability under severe environments such as high temperature and high humidity. [Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Patent Application Laid-Open No. 09-176518 [Patent Document 2] International Publication No. 2015/170560

[Problem to be Solved by the Invention]

However, thermoplastic resins such as polyester, polyamide, polystyrene, polyolefin, polycarbonate, and polyimide, which are raw materials for plastic materials, are usually melted to form fibers, films, sheets, etc., but their surfaces are crystallized. In many cases, there is a lack of adhesion of inks, adhesives, etc. Among them, in the case of thin films, the crystals are highly oriented through the steps of stretching and heat setting, so the level of adhesion is very low, and it is known that the adhesion is generally poor.

This situation can be solved by using a material with high affinity with the plastic film for the functional layer, but the material of the functional layer is extremely limited, and necessary functions may be impaired. Therefore, as in Patent Document 1 or Patent Document 2, an easy-adhesive layer with high affinity to the two layers is provided between the base material and the functional layer to improve the adhesion between the base material and the easy-adhesive layer and the adhesion between the easy-adhesive layer and the functional layer. The method of the adhesion of the functional layer. However, although the functional plastic film provided with an easy-adhesive layer has good initial adhesion, when the film is exposed to a harsh environment such as high temperature and humidity for a long time, the adhesion between the substrate and the easy-adhesive layer and the /or the adhesiveness between the easy-adhesive layer and the functional layer decreases, resulting in adverse situations such as peeling of the easily-adhesive layer and/or the functional layer.

As mentioned above, fields that have not been used in recent years, such as transparent conductive substrates for touch panels, flexible circuit boards, substrates for flexible displays, substrates for organic EL, substrates for LED lighting, etc. Plastic materials are also used as materials for electronic devices, and require high initial adhesion and adhesion stability over time in harsh environments such as high temperature and high humidity, which have not been required before.

The purpose of the present invention is to improve the adhesion between the substrate and the easy-adhesive layer and the adhesion between the easy-adhesive layer and the functional layer, so that sufficient adhesion can be maintained even when exposed to harsh environments such as high temperature and high humidity for a long time sex. [Means to solve the problem]

The functional member of the present invention is characterized in that it is a functional member that is laminated on at least one side of the substrate in the order of an easy-adhesive layer and a functional layer, and is characterized in that the composition for forming the aforementioned easy-adhesive layer includes a glycidyl group-containing polymer. An ester-acrylic composite resin, and the acid value of the solid content of the composition is 2.5~6.0mgKOH/g, the composition used to form the aforementioned functional layer includes a compound having a functional group reactive with glycidyl groups, and the composition The acid value of the solid content is below 4.0mgKOH/g.

In addition, in the functional member of the present invention, it is preferable that the composition for forming the aforementioned easy-adhesive layer contains the aforementioned polyester-acrylic composite resin as a main component.

In addition, in the functional member of the present invention, it is preferable that the content of the acrylic resin component in the total solid content of the composition for forming the easy-adhesive layer is 20 to 50% by weight.

Also, in the functional member of the present invention, it is preferable that the functional group reactive with the aforementioned glycidyl group is a hydroxyl group.

In addition, in the functional member of the present invention, it is preferable that the surface of the substrate on which the easy-adhesive layer is laminated is introduced with a functional group reactive with a glycidyl group by surface treatment.

Also, in the functional member of the present invention, it is preferable that the functional group reactive with the glycidyl group introduced by the aforementioned surface treatment is a hydroxyl group. [Invention effect]

According to the present invention, the adhesion between the base material and the easy-adhesive layer of the aforementioned functional member and the adhesion between the easy-adhesive layer and the functional layer can be improved. In particular, even under severe environments such as high temperature and high humidity, there is little change in the adhesion of the functional member, and good adhesion can be maintained.

Referring to Fig. 1 and Fig. 2, an embodiment of the functional member of the present invention will be described below.

The basic structure of the functional member of the present invention is as shown in FIG. 1 , which has a base material 10 , an easy-adhesive layer 20 and a functional layer 30 . The functional member may not only be as shown in FIG. 1 but also have a back coat layer 40 ( FIG. 2 ) on the surface opposite to the surface on which the organic functional layer 30 is laminated.

First, the substrate 10 will be described. The substrate 10 is suitable to use a plastic film. Plastic film such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, polystyrene, triacetyl fiber Base material can be selected according to the application such as transparency, heat resistance, mechanical strength, dimensional stability, color tone, etc. Among them, stretched, especially biaxially stretched polyethylene terephthalate film is suitable because of its excellent mechanical strength and dimensional stability.

The thickness of the base material 10 is not particularly limited, and the material used can be appropriately selected. In consideration of workability, it is generally not less than 1 μm and not more than 300 μm, preferably not less than 23 μm and not more than 188 μm.

Depending on the situation, the substrate 10 may be subjected to surface treatment such as plasma treatment, corona discharge treatment, and extreme ultraviolet irradiation treatment. By giving these surface treatments, the wettability of the easily-adhesive layer 20 to the base material 10 becomes better, and adhesiveness can be improved. In particular, when the functional group introduced by plasma treatment or corona discharge treatment is a functional group reactive with glycidyl group, it will undergo an addition reaction with the glycidyl group of the easy-adhesive layer 20 to further improve the adhesion. .

Here, the functional group reactive with the glycidyl group introduced by the aforementioned surface treatment includes, for example, hydroxyl group, carboxyl group, hydroperoxy group, carbonyl group, epoxy group, etc., preferably hydroxyl group.

Next, the easy-adhesive layer 20 is demonstrated. The composition for forming the easy-adhesive layer 20 is not particularly limited as long as it contains a glycidyl group-containing polyester-acrylic composite resin and has a specific acid value of the solid content, and the ionizing radiation-curable resin can be Compounds such as thermosetting resins and thermoplastic resins are used alone or in combination of 2 or more, depending on the purpose.

Although the adhesion mechanism is not clear, the composition used to form the easy-adhesive layer 20 has a specific acid value of solid content and contains a glycidyl group polyester-acrylic composite resin. In addition, the composition used to form the functional layer 30 described later The composition has a specific solid component acid value, and since it contains a compound having a reactive functional group with a glycidyl group, an addition reaction occurs between the easy-adhesive layer 20 and the functional layer 30, thereby improving the adhesion between the easy-adhesive layer 20 and the functional layer 30. Adhesion of the functional layer 30 . Also, the adhesion to the base material 10 varies depending on the material of the base material 10, but if the adhesion is insufficient, the adhesion can be improved by applying the aforementioned surface treatment to the base material 10. In addition, when the polar group introduced into the base material 10 through the above-mentioned surface treatment is the specific functional group mentioned above, an addition reaction occurs between the base material 10 and the easy-adhesive layer 20 to further improve the adhesion.

The acid value of the solid content of the composition for forming the easy-adhesive layer 20 is preferably 2.5 mgKOH/ g or more, more preferably 3.0 mgKOH/g or more, preferably 6.0 mgKOH/g or less, and more preferably 4.5 mgKOH/g or less. When the acid value is less than 2.5 mgKOH/g, the addition reaction between the functional group reactive with the glycidyl group and the glycidyl group does not proceed sufficiently, so the adhesion between the substrate 10 and the easy-adhesive layer 20 and the ease of adhesion The adhesion between the subsequent layer 20 and the functional layer 30 may decrease, and when it is greater than 6.0 mgKOH/g, the side reactions such as the ring-opening polymerization of the aforementioned glycidyl groups are prioritized, the aforementioned addition reactions are hindered, and the base material may be generated. 10. The unfavorable situation where the adhesion between the easy-bonding layer 20 and the adhesion between the easy-bonding layer 20 and the functional layer 30 is reduced. The solid content acid value in the present invention is a value calculated from the acid value obtained by the indicator titration method specified in JIS K 2501:2003 and the solid content concentration.

The acid value of the composition for forming the easy-adhesive layer 20 can be adjusted by introducing functional groups such as carboxyl group, sulfonic acid group, phosphoric acid group, phenolic hydroxyl group, etc. into the compound constituting the composition.

It is preferable that the aforementioned composition is mainly composed of polyester-acrylic composite resin. By using the polyester-acrylic composite resin as the main component, the adhesion between the base material 10 and the easy-adhesive layer 20 and the adhesion between the easy-adhesive layer 20 and the functional layer 30 can be improved. The main component of the present invention means that when the total solid content of the components constituting the composition is 100 parts by weight, the component exceeds 50 parts by weight.

The polyester-acrylic composite resin may be a mixture of a polyester resin and an acrylic resin, or a compound containing both a polyester component and an acrylic component as constituent components, or may be a composite thereof. As a compound containing both a polyester component and an acrylic component, a polyester-acrylic copolymer etc. are mentioned, for example. In consideration of the storage stability of the composition and the transparency or smoothness of the film, it is preferable to use a compound containing both a polyester component and an acrylic component as constituent components.

The component ratio of the composition used to form the easy-adhesive layer 20 is not necessarily limited, and when the content of the acrylic resin component occupied in the entire solid component is within the range of 20 to 50% by weight, the substrate 10 and the substrate 10 can be further improved. Adhesion of the easily bonding layer 20 and the bonding between the easily bonding layer 20 and the functional layer 30 .

The content of the glycidyl group in the aforementioned polyester-acrylic composite resin is represented by the number of grams of the compound containing 1 gram equivalent of epoxy group, that is, it can be represented by epoxy equivalent. The epoxy equivalent in the aforementioned polyester-acrylic composite resin is preferably 100 g/eq. or more, more preferably 120 g/eq. or more, and most preferably 120 g/eq. More than 150g/eq., less than 100000g/eq., more preferably less than 10000g/eq., most preferably less than 5000g/eq. By satisfying this range, sufficient adhesiveness can be maintained even after prolonged exposure in severe environments such as initial adhesiveness and high temperature and high humidity. When the aforementioned epoxy equivalent is less than 100 g/eq., the rigidity or toughness of the easy-adhesive layer 20 is insufficient, and the adhesion between the substrate 10 and the easily-adhesive layer 20 and/or the adhesion between the easily-adhesive layer 20 and the functional layer 30 reduced sex. Also, when it exceeds 100,000 g/eq., the glycidyl content is too small, and the amount of chemical bonds formed by addition reactions between the substrate 10 and the easy-adhesive layer 20 and between the easy-adhesive layer 20 and the functional layer 30 Insufficient, when exposed to harsh environments such as high temperature and high humidity for a long time, peeling between the base material 10 and the easy-adhesive layer 20 and/or between the easy-adhesive layer 20 and the functional layer 30 may occur. The epoxy equivalent can be obtained by the method stipulated in JIS K 7236:2009.

In addition, the easy-adhesive layer 20 may also suitably contain antistatic agents, antioxidants, leveling agents, antiblocking agents, slip agents, flame retardants, ultraviolet absorbers, dispersants, Additives for coagulants, pigments, dyes, lubricants, etc.

The thickness of the easily-adhesive layer 20 is not less than 0.01 μm and not more than 50 μm, preferably not less than 0.1 μm and not more than 5 μm, more preferably not less than 0.5 μm and not more than 2 μm. By having such a thickness, the adhesion between the substrate 10 and the easy-adhesive layer 20 and the adhesion between the easy-adhesive layer 20 and the functional layer 30 can be improved, even when exposed to harsh environments such as high temperature and high humidity for a long time , can also maintain sufficient adhesion.

The thickness of the easily bonding layer 20 can be measured, for example, by a reflection spectrometer (FE-300UV: Otsuka Electronics Co., Ltd.).

Next, the functional layer 30 will be described. The composition for forming the functional layer 30 is not particularly limited as long as it is a functional group reactive with a glycidyl group and has a specific acid value in solid content, and ionizing radiation curable resins, thermosetting resins, Compounds such as thermoplastic resins are used individually or in combination of 2 or more, depending on the purpose.

This ionizing radiation-curable resin can be cured by irradiating ionizing radiation (ultraviolet rays or electron beams) to an ionizing radiation-curable coating material mixed with one or more kinds of photopolymerizable prepolymers or photopolymerizable monomers. By. Here, a photopolymerizable prepolymer, for example, an acrylic prepolymer having one or more (meth)acryl groups in one molecule is particularly suitable for use. Examples of the acrylic prepolymer include urethane acrylate, polyester acrylate, epoxy acrylate, melamine acrylate, polyperfluoroalkyl acrylate, and silicone acrylate.

In addition, a photopolymerizable monomer, for example, an acrylic monomer having one or more (meth)acryl groups in one molecule is particularly suitably used. Examples thereof include 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and 2-butoxyethyl acrylate. Functional acrylic monomers; e.g. 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, diethylene glycol diacrylate, polyethylene glycol diacrylate, neopentyl glycol dihydroxypivalate Bifunctional acrylic monomers such as acrylates; multifunctional (more than trifunctional) acrylic monomers such as dipentaerythritol hexaacrylate, trimethylolpropane triacrylate, and pentaerythritol triacrylate; etc. These photopolymerizable monomers can be used individually or in combination of 2 or more types. The mixing ratio of the photopolymerizable prepolymer and the photopolymerizable monomer is not particularly limited, and can be appropriately set according to the purpose and application.

In addition, examples of thermosetting resins include polyester acrylate resins, polyurethane acrylate resins, epoxy acrylate resins, epoxy resins, melamine resins, phenol resins, silicone resins, etc. Department of resin, etc.

Further, thermoplastic resins include, for example, polyester resins, acrylic resins, polycarbonate resins, cellulose resins, acetal resins, vinyl resins, polyethylene resins, polystyrene resins, polypropylene resins, resins, polyamide resins, polyimide resins, fluorine resins, etc.

The functional group reactive with the glycidyl group of the easily-adhesive layer 20 contained in the composition for forming the functional layer 30 is not particularly limited, for example, a hydroxyl group, an amine group, a carboxyl group, carboxylic anhydride, an imidazole group, a mercapto group, and an isocyanate group can be used. Base etc.

In consideration of easiness of reaction control during production, a hydroxyl group is particularly preferred.

The solid component acid value of the composition for forming the functional layer 30 is preferably 4.0 mgKOH/g or less, and more preferably 3.0 mgKOH/g or less in order to improve the adhesion between the easily bonding layer 20 and the functional layer 30 . When the acid value exceeds 4.0 mgKOH/g, side reactions such as ring-opening polymerization of the glycidyl group in the easily-adhesive layer 20 take precedence, and an undesirable situation in which the addition reaction exhibiting the above-mentioned adhesiveness is hindered occurs. The acid value of the solid content is obtained by the same method as the acid value of the solid content of the composition for forming the easy-adhesive layer 20 described above.

The functional layer 30 may further depend on the curing method, and may also include a photoinitiator, a curing agent, and the like. Photoinitiators include acetophenones, benzophenones, Michler's ketones, benzoin, benzyl methyl acetal, benzoyl benzoate, α-acyl oxime ester, sulfur Photoradical polymerization initiators such as thioxanthones or photocationic polymerization initiators such as onium salts, sulfonate esters, and organometallic complexes. Among them, side reactions such as the ring-opening polymerization of the glycidyl group in the easy-adhesive layer 20 are not likely to occur, and the photopolymerizable prepolymer or photopolymerizable monomer having a (meth)acryl group is effectively polymerized. Free-radical polymerization initiators are particularly suitable for use. In addition, the curing agent can be suitably used in combination with resins suitable for compounds such as polyisocyanate, amino resin, epoxy resin, and carboxylic acid.

In addition, the functional layer 30 may suitably contain an antistatic agent, an antioxidant, a leveling agent, an antiblocking agent, a slip agent, a flame retardant, an ultraviolet absorber, a dispersant, and a coagulant within the range that does not hinder the functions of the present invention. , pigments, dyes, lubricants and other additives.

The thickness of the functional layer 30 is not less than 0.01 μm and not more than 100 μm, preferably not less than 1 μm and not more than 10 μm, more preferably not less than 2 μm and not more than 5 μm. By having such a thickness, the adhesion between the functional layer 30 and the easy-adhesive layer 20 is improved, and sufficient adhesion can be maintained even when exposed to severe environments such as high temperature and high humidity for a long time. The thickness of the functional layer 30 is measured, for example, by a reflection spectrometer (FE-300UV: Otsuka Electronics Co., Ltd.).

The function of the functional layer 30 is not particularly limited, for example, it can be based on anti-glare layer, hard coating layer, anti-reflection layer, anti-fouling layer, antibacterial layer, barrier layer, light-shielding layer, index matching layer (index matching layers), antistatic layer Suitable choice for other purposes. Such as the hard coating, due to the large shrinkage of the film, the situation that does not damage the function of the adhesion is selected. By satisfying the conditions of the easy-adhesive layer 20 and the functional layer 30 of the present invention, the adhesion can be effectively improved. Attachment.

Next, the back coat layer 40 will be described. The functional components of the present invention are laminated on at least one side of the base material in the order of the easy-adhesive layer 20 and the functional layer 30 , but a back coat 40 may also be provided if necessary. The back coat layer 40 is not particularly limited, and a layer having necessary functions can be appropriately used depending on the application. The easy-adhesive layer 20 and the functional layer 30 may be provided as the back coat layer 40 , and surface treatment may be applied between the substrate 10 and the back coat layer 40 .

Next, an example of the production method of the functional member of the present invention will be described. The method of making the functional component of the present invention is not particularly limited. For example, on any substrate 10, the above-mentioned easy-adhesive layer 20 material is dissolved or dispersed in a suitable solvent by a known method and coated with a coating solution for the easy-adhesive layer. Fabricated on the substrate 10, dried, and then irradiated with ionizing radiation such as ultraviolet rays as necessary. Then, on the easy-adhesive layer 20, apply a coating solution for a functional layer by dissolving or dispersing the above-mentioned materials for the functional layer 30 in a suitable solvent by a known method, dry it, and if necessary, irradiate it with ionizing radiation such as ultraviolet rays. make.

In addition, when there is a back coat layer 40, on the surface opposite to the functional layer 30 of the base material 10 provided with the organic functional layer 30, a back coat layer that is dissolved or dispersed in a suitable solvent is applied by a known method. Liquid is dried and, if necessary, irradiated with ionizing radiation such as ultraviolet rays.

The coating method (film-forming method) of the above-mentioned easy-adhesive layer 20, functional layer 30, and backside coating layer 40 is not particularly limited, for example, spin coating method, extrusion die coating method, knife coating method, bar coating method can be used , screen printing method, stencil printing method, roll coating method, spray coating method, dip coating method, inkjet method and other known coating methods.

At this time, the coating order of the easily bonding layer 20 , the functional layer 30 and the back coat layer 40 can be appropriately selected from the viewpoint of productivity and the like. Also, if necessary, a functional layer may be laminated and coated on the functional layer 30 or the back coat layer 40 .

Next, the characteristics of the functional member of the present invention will be described. The characteristics of functional components are initial adhesion and adhesion after long-term exposure to severe environments such as high temperature and high humidity.

The adhesion is based on the checkerboard peeling test stipulated in JIS K 5400. After the functional member is produced, the state without any treatment (hereinafter referred to as the "initial adhesion test") and the accelerated weather resistance test are at a temperature of 85 ℃ and humidity 85% (humidification is implemented with pure water) after exposure for a certain period of time (hereinafter referred to as "adhesion test after high temperature and high humidity exposure"). Among the 100 grids of the checkerboard, more than 80 grids, no more than 1/4 of the stripped state is considered qualified.

According to the functional member of the present invention, the adhesion between the substrate 10 and the easy-adhesive layer 20 and the adhesion between the easy-adhesive layer 20 and the functional layer 30 can be improved. In particular, there is little change over time due to long-term exposure to severe environments such as high temperature and high humidity, and good adhesion is maintained. [Example]

Examples and comparative examples of the functional member of the present invention will be described below. In addition, in the following examples and comparative examples, unless otherwise stated, "%" and "parts" are based on weight.

[Example 1] Corona discharge treatment was applied to one side of a polyethylene terephthalate film (lumirror T60: Toray Corporation) with a thickness of 100 μm, and the coating solution for the easy-adhesive layer shown in Table 1 was applied to the surface-treated side. A, an easy-adhesive layer with a thickness of 1.5 μm is formed after drying. Next, the functional layer coating liquid A in the formula shown in Table 2 was coated on the easy-adhesive layer, and after drying, it was cured by irradiating ultraviolet rays to form a functional layer with a thickness of 3 μm, and the functional member of Example 1 was produced.

＜Manufacture of polyester resin A water dispersion＞ Put 83 parts of terephthalic acid, 36 parts of isophthalic acid, 32 parts of ethylene glycol and 46 parts of neopentyl glycol into a flask equipped with a nitrogen introduction tube, a thermometer, a stirrer and a distiller, and heat at 260°C for 4 hours carry out esterification reaction. Next, 0.1 part of antimony trioxide was added as a catalyst, the temperature of the system was raised to 280° C., and the pressure of the system was gradually reduced to 0.1 mmHg after 1.5 hours. Under these conditions, the polycondensation reaction was carried out for another 4 hours, and polyester resin A with a molecular weight of 18,400 was obtained as a result. Put the obtained polyester resin A (25 parts) into a mixed solution of 15 parts of isopropanol and 60 parts of ion-exchanged water, and stir at 70~80°C for 3 hours to obtain a polyester resin A with a solid content concentration of 25%. water dispersion. The acid value of the solid content of the polyester resin A aqueous dispersion was 1.0 mgKOH/g.

＜Manufacture of Polyester Resin B Aqueous Dispersion＞ 77 parts of dimethyl terephthalate, 50 parts of dimethyl isophthalate, 47 parts of ethylene glycol, 73 parts of neopentyl glycol, 0.1 part of zinc acetate as a catalyst and antimony trioxide 0.1 part was put into a flask equipped with a nitrogen introduction tube, a thermometer, a stirrer and a distiller, and heated at 140-220°C for 3 hours to carry out a transesterification reaction. Next, under reduced pressure (10-0.2mmHg) at 240-270°C, the polycondensation reaction takes 30 minutes. Next, 15 parts of trimellitic anhydride was added at 170~190°C under normal pressure, and the addition reaction was carried out for 30 minutes. As a result, polyester resin B with a molecular weight of 5,700 was obtained. Put the obtained polyester resin B (25 parts) into a mixed solution of 15 parts of isopropanol and 60 parts of ion-exchanged water, and stir at 70~80°C for 3 hours to obtain polyester resin B with a solid content concentration of 25%. water dispersion. The acid value of the solid content of the polyester resin B aqueous dispersion was 42 mgKOH/g.

＜Manufacture of Polyester Resin C Water Dispersion＞ Put 83 parts of terephthalic acid, 83 parts of isophthalic acid, 62 parts of ethylene glycol, 21 parts of diethylene glycol and 0.1 part of zinc acetate as a catalyst into a machine equipped with a nitrogen introduction pipe, a thermometer, a mixer and a distiller. In the flask, heat at 190~220°C for 13 hours to carry out esterification reaction to obtain polyester glycol. Put 100 parts of the obtained polyester diol, 100 parts of xylene, and 28 parts of pyromellitic anhydride into a flask equipped with the same equipment as above, and react at 140°C for 1 hour, then distill off the xylene, and the temperature of the system takes After 2 hours, the temperature was raised to 180° C., and the temperature was maintained for another 1 hour. As a result, polyester resin C having a molecular weight of 18,000 was obtained. Put the obtained polyester resin C (25 parts) into a mixed solution of 15 parts of isopropanol and 60 parts of ion-exchanged water, and stir at 70~80°C for 3 hours to obtain polyester resin C with a solid content concentration of 25%. water dispersion. The acid value of the solid content of the polyester resin C aqueous dispersion was 110 mgKOH/g.

＜Manufacture of Acrylic Resin A Water Dispersion＞ 18 parts of ion-exchanged water and 3 parts of ELEMINOL RS-3000 (Sanyo Chemical Industry Co., Ltd., anionic surfactant, solid content concentration 50%) were put into a beaker, and 40 parts of glycidyl methyl acrylate were added while stirring to prepare a single Body emulsion. Next, 37.5 parts of ion-exchanged water, ELEMINOL RS-3000 (1 part) and 0.5 parts of potassium persulfate were put into a flask equipped with a condenser, a monomer dropping funnel, a thermometer, and a stirrer, and nitrogen substitution was performed while stirring. , heating was started, and the aforementioned monomer emulsion was dropped at 75° C. over 4 hours. After completion of the dropping, the mixture was stirred at a liquid temperature of 75 to 85° C. for 4 hours, and then cooled. After cooling, ion-exchange water was added to obtain an aqueous dispersion of acrylic resin A having a glycidyl group with a solid content concentration of 25%. The solid content acid value of the acrylic resin A aqueous dispersion was 0.33 mgKOH/g. ＜Manufacture of Acrylic Resin B Water Dispersion＞ Put 18 parts of ion-exchanged water and 3 parts of ELEMINOL RS-3000 (Sanyo Chemical Industry Co., Ltd., anionic surfactant, solid content concentration 50%) into a beaker, and stir while adding 71 parts of methyl methacrylate and butyl acrylate. 29 parts, making monomer emulsion. Next, 37.5 parts of ion-exchanged water, ELEMINOL RS-3000 (1 part) and 0.5 parts of potassium persulfate were put into a flask equipped with a condenser, a monomer dropping funnel, a thermometer, and a stirrer, and nitrogen substitution was performed while stirring. , heating was started, and the aforementioned monomer emulsion was dropped at 75° C. over 4 hours. After completion of the dropping, the mixture was stirred at a liquid temperature of 75 to 85° C. for 4 hours, and then cooled. After cooling, ion-exchange water was added to obtain an aqueous dispersion of acrylic resin B without a glycidyl group with a solid content concentration of 25%. The solid content acid value of the acrylic resin B aqueous dispersion was 0.50 mgKOH/g.

[Example 2] The functional component of Example 2 was produced in the same manner as in Example 1, except that the corona discharge treatment of Example 1 was not applied.

[Example 3] The functional member of Example 3 was produced in the same manner as in Example 1, except that the coating solution A for an easily bonding layer in Example 1 was changed to the coating solution B for an easily bonding layer described in Table 1.

[Example 4] The functional member of Example 4 was fabricated in the same manner as in Example 1, except that the coating solution A for an easily bonding layer in Example 1 was changed to the coating solution C for an easily bonding layer described in Table 1.

[Example 5] The functional member of Example 5 was produced in the same manner as in Example 1, except that the functional layer coating solution A in Example 1 was changed to the functional layer coating solution B described in Table 2.

[Example 6] The functional member of Example 6 was produced in the same manner as in Example 1, except that the functional layer coating solution A in Example 1 was changed to the functional layer coating solution C described in Table 2.

[Example 7] The functional member of Example 7 was produced in the same manner as in Example 1, except that the functional layer coating solution A in Example 1 was changed to the functional layer coating solution D described in Table 2.

[Example 8] The functional member of Example 8 was fabricated in the same manner as in Example 1, except that the functional layer coating solution A in Example 1 was changed to the functional layer coating solution E described in Table 2.

[Comparative example 1] The functional member of Comparative Example 1 was produced in the same manner as in Example 1, except that the coating solution A for an easily bonding layer in Example 1 was changed to the coating solution D for an easily bonding layer described in Table 1.

[Comparative example 2] The functional member of Comparative Example 2 was fabricated in the same manner as in Example 1, except that the functional layer coating solution A in Example 1 was changed to the functional layer coating solution F described in Table 2.

[Comparative example 3] The functional member of Comparative Example 3 was produced in the same manner as in Example 1, except that the coating solution A for an easily bonding layer in Example 1 was changed to the coating solution E for an easily bonding layer described in Table 1.

[Comparative example 4] A functional member of Comparative Example 4 was produced in the same manner as in Example 1, except that the coating solution A for an easily bonding layer in Example 1 was changed to the coating solution F for an easily bonding layer described in Table 1.

[Comparative Example 5] A functional member of Comparative Example 5 was produced in the same manner as in Example 1, except that the coating solution A for an easily bonding layer in Example 1 was changed to the coating solution G for an easily bonding layer described in Table 1.

[Comparative Example 6] The functional member of Comparative Example 6 was produced in the same manner as in Example 1, except that the coating solution A for an easily bonding layer in Example 1 was changed to the coating solution H for an easily bonding layer described in Table 1.

The following characteristics were evaluated about the coating liquid for an easily-adhesive layer, the coating liquid for a functional layer, and a functional member produced in the said Example and the comparative example.

＜Calculation of acid value of solid content＞ For the coating liquids for the easy-adhesive layer and the coating liquids for the functional layer of Examples 1-8 and Comparative Examples 1-6 described above, the acids obtained by the indicator titration method specified in JIS K 2501:2003 The value calculated from the value and the respective solid content concentration is taken as the solid content acid value. The calculated results are shown in Table 3.

＜Adhesion test＞ 1. Initial adhesion test The functional aspects of the functional members produced in the above-mentioned examples and comparative examples were tested in accordance with the checkerboard peeling test stipulated in JIS K 5400, and evaluated on the basis shown below. In all the 100 squares of the chessboard, no more than a quarter of the peeling state is seen, and the evaluation is "◎". Among the 100 squares, no quarters are seen in the 80 or more squares The state of one or more peelings was evaluated as "O", and the state of not seeing more than one-fourth of the peeled squares out of 100 squares was evaluated as "X". The measurement results are shown in Table 3.

2. Adhesion test after high temperature and high humidity exposure The functional components produced in the above-mentioned examples and comparative examples were exposed for 500 hours in an environment with a temperature of 85°C and a humidity of 85% (humidification was implemented with pure water). Then, the functional layer was tested according to the checkerboard peeling test stipulated in JIS K 5400, and evaluated by the following criteria. In all the 100 squares of the chessboard, no more than a quarter of the peeling state is seen, and the evaluation is "◎". Among the 100 squares, no quarters are seen in the 80 or more squares The state of one or more peelings was evaluated as "O", and the state of not seeing more than one-fourth of the peeled squares out of 100 squares was evaluated as "X". The measurement results are shown in Table 3.

From the results in Table 3, it can be known that the functional components of Examples 1-8 are formed because the composition used to form the easy-adhesive layer on the substrate is a polyester-acrylic composite resin with a glycidyl group, and the solid content of the composition is The acid value is 2.5~6.0 mgKOH/g, the composition for forming the aforementioned functional layer contains a compound having a functional group reactive with glycidyl groups, and the acid value of the solid component of the composition is less than 4.0 mgKOH/g, Therefore, the initial adhesion test and the adhesion test after exposure to high temperature and high humidity are all evaluated well, and the adhesion between the base material and the easy-bonding layer and the adhesion between the easy-bonding layer and the functional layer are excellent.

In Comparative Example 1 and Comparative Example 6, because the composition used to form the easy-adhesive layer did not contain a compound with a glycidyl group, there was no adhesion between the base material and the easy-adhesive layer and the adhesion between the easy-adhesive layer and the functional layer. Addition reaction of adhesion, initial adhesion and adhesion after exposure to high temperature and high humidity are poorer. In Comparative Example 1 and Comparative Example 4, the acid value of the solid content of the composition for forming an easy-to-adhesive layer was less than 2.5 mgKOH/g, so the addition reaction showing the aforementioned adhesion did not proceed sufficiently, and the initial adhesion and Poor adhesion after exposure to high temperature and humidity. Comparative example 3 and comparative example 5 are because the acid value of the solid content of the composition used to form the easy-to-adhesive layer exceeds 6.0 mgKOH/g, so the side reactions such as the ring-opening polymerization of the glycidyl group are prioritized, and the above-mentioned increase in adhesion is exhibited. The formation reaction is hindered, and the initial adhesion and/or the adhesion after exposure to high temperature and high humidity are poor. In Comparative Example 2, although the acid value of the solid content of the composition for forming the easy-adhesive layer is within a good range, the acid value of the solid content of the composition for forming the functional layer exceeds 4.0 mgKOH/g, so the above-mentioned adhesiveness is exhibited. The addition reaction did not proceed sufficiently, so the adhesiveness was poor after exposure to high temperature and high humidity. In addition, Comparative Example 1 is due to the low concentration of acryl group in the composition for forming an easy-adhesive layer, so the initial adhesion and adhesion after exposure to high temperature and high humidity are poor. Comparative Example 5 is a composition for forming an easily-adhesive layer. The concentration of the acryl group component in the product is too high, so the adhesion is poor after exposure to high temperature and high humidity.

10‧‧‧Substrate 20‧‧‧Easy bonding layer 30‧‧‧Functional layer 40‧‧‧Back coating

[Fig. 1] The basic form of the functional member of the present invention. [ Fig. 2 ] In the functional member of the present invention, a back coat is applied to the surface opposite to the surface on which the organic functional layer is formed of the substrate.

10‧‧‧Substrate

20‧‧‧Easy bonding layer

30‧‧‧Functional layer

Claims (6)

A functional member, characterized in that it is a functional member laminated on at least one side of a substrate in the order of an easy-adhesive layer and a functional layer, and the composition for forming the aforementioned easy-adhesive layer includes a glycidyl-containing polyester-acrylic composite resin The content of the acrylic resin component in the solid components of the composition for forming the above-mentioned easy-adhesive layer is 20 to 50% by weight, and the acid value of the solid content of the composition is 2.5 to 6.0 mgKOH/g, forming The composition for the aforementioned functional layer contains a compound having at least one functional group selected from hydroxyl group, amino group, carboxyl group, carboxylic anhydride group, imidazole group, mercapto group, and isocyanate group, and the acid value of the solid content of the composition is 4.0 mgKOH/g or less. The functional member according to claim 1, wherein the composition for forming the aforementioned easy-adhesive layer is one mainly composed of the aforementioned polyester-acrylic composite resin. The functional component according to claim 1, wherein the functional group reactive with the glycidyl group is a hydroxyl group. The functional component according to claim 2, wherein the functional group reactive with the glycidyl group is a hydroxyl group. The functional component according to any one of claims 1 to 4, wherein the aforementioned base material The surface of the laminate having the above-mentioned easy-adhesive layer is one in which a functional group reactive with a glycidyl group has been introduced by surface treatment. The functional component according to claim 5, wherein the functional group reactive with the glycidyl group introduced by the aforementioned surface treatment is a hydroxyl group.

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