JP7138459B2 - Functional material - Google Patents

Description

The present invention relates to a functional member, a film, a sheet, etc., in which a base material, an easy-adhesion layer, and a functional layer are laminated in this order. It relates to flexible materials, films, sheets, and the like.

Plastic materials are widely used as materials for electronic devices due to their light weight, suitability for processing, and productivity. A plastic material may be used alone, but in many cases, a functional layer having a specific function is laminated on the surface to add a function according to the application. Especially in recent years, the use of plastic materials has progressed in areas where they were not used in the past as a replacement for glass and metal materials. It's become a demand.

JP-A-09-176518 International Publication No. 2015/170560

However, thermoplastic resins such as polyester, polyamide, polystyrene, polyolefin, polycarbonate, and polyimide, which are raw materials for plastic materials, are usually melted and formed into fibers, films, sheets, etc., but their surfaces are crystallized. In many cases, the adhesiveness of inks, adhesives, etc. is poor. Especially, in the case of film, it is known that the level of adhesiveness is very low and the adhesion is generally poor because the crystal orientation is highly oriented by the process of stretching and heat setting.

In such a case, the problem can be solved by using a material that has a high affinity with the plastic film for the functional layer, but the materials for the functional layer are extremely limited, and the necessary functions may be impaired. Therefore, as in Patent Document 1 and Patent Document 2, an easy-adhesion layer that has a high affinity with both layers is provided between the base material and the functional layer, so that the adhesion between the base material and the easy-adhesion layer and the function of the easy-adhesion layer are improved. Techniques have been taken to improve the adhesion of the layers. However, even with such a functional plastic film provided with an easy-adhesion layer, although the initial adhesiveness is good, if the film is exposed to severe environments such as high temperature and high humidity for a long time, it will deteriorate. Adhesion between the base material and the easy-adhesion layer and/or adhesion between the easy-adhesion layer and the functional layer is reduced, causing problems such as peeling of the easy-adhesion layer and/or the functional layer.

As mentioned above, in recent years, electronic fields such as transparent conductive substrates for touch panels, flexible circuit substrates, flexible display substrates, organic EL substrates, LED lighting substrates, etc. Plastic materials are also used as materials for devices, and high initial adhesion and long-term adhesion stability under harsh environments such as high temperature and high humidity, which have not been required in the past, are required.

The present invention improves the adhesion between the base material and the easy-adhesion layer and the adhesion between the easy-adhesion layer and the functional layer, and maintains sufficient adhesion even after long-term exposure in severe environments such as high temperature and high humidity. for the purpose.

The functional member of the present invention is a functional member in which an easy-adhesion layer and a functional layer are laminated in this order on at least one surface of a base material, and the solid content of the composition for forming the easy-adhesion layer is value is 10. 0 mgKOH/g or more, the composition for forming the functional layer has a solid content acid value of 4.0 to 12.0 mgKOH/g, and constitutes the composition for forming the functional layer It is characterized by including components having one or more functional groups selected from a carboxy group, a sulfo group, a phosphoric acid group, and a phenolic hydroxy group .

Further, the functional member of the present invention is preferably characterized in that the composition for forming the easy-adhesion layer contains a polyester-acrylic composite resin as a main component.

Further, the functional member of the present invention is preferably characterized in that the polyester-acrylic composite resin contains more acrylic resin components than polyester resin components on a weight basis. .

Moreover, the functional member of the present invention is preferably characterized in that the surface of the base material on which the easy-adhesion layer is laminated has a polar group introduced by surface treatment.

Moreover, the functional member of the present invention is preferably characterized in that the polar group is selected from one or more of a hydroxy group, a carboxy group and a sulfo group.

According to the present invention, it is possible to improve the adhesion between the substrate and the easy-adhesion layer and the adhesion between the easy-adhesion layer and the functional layer of the functional member. In particular, even in severe environments such as high temperature and high humidity, the functional member hardly changes in adhesion and maintains good adhesion.

Basic form of the functional member of the present invention In the functional member of the present invention, a form in which a back coat layer is applied to the surface of the substrate opposite to the surface on which the functional layer is formed

An embodiment of the functional member of the present invention will be described below with reference to FIGS. 1 and 2. FIG.

The functional member of the present invention has a base material 10, an easily bonding layer 20 and a functional layer 30 as shown in FIG. 1 as a basic structure. The functional member is not limited to the one shown in FIG. 1, and may have a back coat layer 40 (FIG. 2) on the side opposite to the side on which the functional layer 30 is laminated.

First, the base material 10 will be described. A plastic film is preferably used as the substrate 10 . Examples of plastic films that can be used include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, polystyrene, triacetyl cellulose, polymethyl methacrylate, polyvinyl chloride, polynorbornene, and polyimide compounds. , heat resistance, mechanical strength, dimensional stability, color, and the like. Among them, stretched, particularly biaxially stretched polyethylene terephthalate film is preferably used because of its excellent mechanical strength and dimensional stability.

The thickness of the base material 10 is not particularly limited and can be appropriately selected according to the material to be applied. Considering handleability, the thickness is generally 1 μm or more and 300 μm or less, preferably 23 μm or more and 188 μm or less.

In some cases, the base material 10 is subjected to surface treatment such as plasma treatment, corona discharge treatment, far-ultraviolet irradiation treatment, and the like. By applying these surface treatments, the wettability of the easy-adhesion layer 20 to the substrate 10 is improved, and the adhesion is improved. In particular, when the polar group introduced by plasma treatment or corona discharge treatment is a specific functional group, it forms a hydrogen bond with a composition having a specific solid content acid value for forming the easy adhesion layer 20 described later, Improve adhesion.

Here, the polar group introduced by the surface treatment includes, for example, a carboxy group, an epoxy group, a hydroxy group, a carbonyl group, a hydroperoxy group, a sulfo group, etc., preferably a hydroxy group, a carboxy group, or a sulfo group. It is desirable to select from one or more of

Next, the easy-adhesion layer 20 will be described. The easy-adhesion layer 20 is not particularly limited as long as it is formed from a composition having a specific solid content acid value. The above can be combined and can be used properly according to the purpose.

Although the adhesion mechanism is not certain, the composition for forming the easy adhesion layer 20 has a specific solid content acid value, and the composition for forming the functional layer 30 described later has a specific solid content acid value. It is considered that the hydrogen bond is formed between the easy-adhesion layer 20 and the functional layer 30 by having the valency, thereby improving the adhesion.
The adhesion to the substrate 10 varies depending on the material of the substrate 10, but if the adhesion is not sufficient, the adhesion can be improved by subjecting the substrate 10 to the surface treatment described above.
Furthermore, when the polar group introduced into the base material 10 by the surface treatment is a specific functional group as described above, a hydrogen bond is also formed between the base material 10 and the easy-adhesion layer 20, and adhesion is improved. Improve.

The acid value of the composition for forming the easy adhesion layer 20 is adjusted by introducing a functional group such as a carboxy group, a sulfo group, a phosphoric acid group, a phenolic hydroxy group, etc. into a compound constituting the composition. can do.

The solid content acid value of the composition for forming the easy-adhesion layer 20 is 10.0 mgKOH/10.0 mgKOH/ in order to improve the adhesion between the substrate 10 and the easy-adhesion layer 20 and the adhesion between the easy-adhesion layer 20 and the functional layer 30. g or more, more preferably 10.5 mg KOH/g or more, most preferably 11.0 mg KOH/g or more. When the solid content acid value is less than 10.0 mgKOH/g, a sufficient amount of hydrogen bonds for exhibiting the adhesion is not formed, and the adhesion between the substrate 10 and the easy adhesion layer 20 and the easy adhesion layer 20 and the adhesion of the functional layer 30 may deteriorate.
The solid content acid value in the present invention is a value calculated from the acid value determined by the indicator titration method defined in JIS K 2501:2003 and the solid content concentration.

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

The polyester-acrylic composite resin may be a mixture of a polyester resin and an acrylic resin, or a compound containing at least both a polyester component and an acrylic component as constituent components, or a composite of them. A compound containing both a polyester component and an acrylic component as constituent components includes, for example, a polyester-acrylic copolymer. Considering the storage stability of the composition and the transparency and smoothness of the film, a compound containing both a polyester component and an acrylic component as constituent components is desirable.

Also, the ratio of the polyester and acrylic components in the polyester-acrylic composite resin is not necessarily limited, but it is desirable that the acrylic resin component accounts for more than the polyester resin component on a weight basis. For example, the content of the main acrylic resin component is preferably 51 to 99% by weight, more preferably 60 to 97% by weight. Within this range, the adhesion between the base material 10 and the easy-adhesion layer 20 and the adhesion between the easy-adhesion layer 20 and the functional layer 30 are further improved.

Further, the easy adhesion layer 20 may contain antistatic agents, antioxidants, leveling agents, antiblocking agents, slip agents, flame retardants, ultraviolet absorbers, dispersants, flocculants, and pigments within a range that does not impede the functions of the present invention. , dyes, lubricants and the like can be contained as appropriate.

The thickness of the easy adhesion layer 20 is 0.01 μm or more and 50 μm or less, preferably 0.1 μm or more and 5 μm or less, and more preferably 0.5 μm or more and 2 μm or less. By having such a thickness, the adhesion between the substrate 10 and the easy-adhesion layer 20 and the adhesion between the easy-adhesion layer 20 and the functional layer 30 are improved, and in long-term exposure under severe environments such as high temperature and high humidity. Sufficient adhesion is maintained.
The thickness of the easy-adhesion layer 20 is measured by, for example, a reflection spectroscopic film thickness meter (FE-300UV: Otsuka Electronics Co., Ltd.).

Next, the functional layer 30 will be explained. The composition for forming the functional layer 30 is not particularly limited as long as it has a specific solid content acid value. The above can be combined and can be used properly according to the purpose.

As such an ionizing radiation curable resin, an ionizing radiation curable paint mixed with one or more of photopolymerizable prepolymers or photopolymerizable monomers is irradiated with ionizing radiation (ultraviolet rays or electron beams). can be used. As the photopolymerizable prepolymer, an acrylic prepolymer having one or more (meth)acryloyl groups in one molecule is particularly preferably used. Examples of acrylic prepolymers include urethane acrylate, polyester acrylate, epoxy acrylate, melamine acrylate, polyperfluoroalkyl acrylate, and silicone acrylate.

As the photopolymerizable monomer, an acrylic monomer having one or more (meth)acryloyl groups in one molecule is particularly preferably used. For example, monofunctional acrylic monomers such as 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-butoxyethyl acrylate; Bifunctional acrylic monomers such as acrylates, polyethylene glycol diacrylate, and neopentyl glycol hydroxypivalate diacrylate; polyfunctional (trifunctional or higher) acrylics such as dipentaerythritol hexaacrylate, trimethylolpropane triacrylate, and pentaerythritol triacrylate monomer; and the like. These photopolymerizable monomers can be used alone or in combination of two or more. The mixing ratio of the photopolymerizable prepolymer and the photopolymerizable monomer is not particularly limited, and is appropriately set according to the purpose and application.

Examples of thermosetting resins include polyester acrylate-based resins, polyurethane acrylate-based resins, epoxy acrylate-based resins, epoxy-based resins, melamine-based resins, phenol-based resins, and silicone-based resins.

Examples of thermoplastic resins include polyester-based resins, acrylic-based resins, polycarbonate-based resins, cellulose-based resins, acetal-based resins, vinyl-based resins, polyethylene-based resins, polystyrene-based resins, polypropylene-based resins, polyamide-based resins, and polyimides. resins, fluorine-based resins, and the like.

The solid content acid value of the composition for forming the functional layer 30 is preferably 4.0 mgKOH/g or more, more preferably 4.5 mgKOH/g, in order to improve the adhesion between the easy adhesion layer 20 and the functional layer 30. As mentioned above, it is most preferably 5.0 mgKOH/g or more, preferably 12.0 mgKOH/g or less, further preferably 11.0 mgKOH/g or less, and most preferably 9.0 mgKOH/g or less. When the solid content acid value is less than 4.0 mgKOH/g, a sufficient amount of hydrogen bonds for exhibiting adhesion between the easy-adhesion layer 20 and the functional layer 30 is not formed. The adhesion of the layer 30 may decrease, and if it exceeds 12.0 mgKOH/g, a side reaction such as hydrolysis of ester may occur, and the hydrogen bond formed between the easy-adhesion layer 20 and the functional layer 30 may be lost. The amount may decrease, and the adhesion between the easy-adhesion layer 20 and the functional layer 30 may deteriorate.
The solid content acid value can be obtained by the same method as the solid content acid value of the composition for forming the easy adhesion layer 20 described above.

The acid value of the composition for forming the functional layer 30 is adjusted by introducing a functional group such as a carboxyl group, a sulfo group, a phosphoric acid group, a phenolic hydroxy group, etc. into the components constituting the composition. be able to.

The functional layer 30 may further contain a photoinitiator, a curing agent, etc. depending on the curing method.
Photoinitiators include photoradical polymerization initiators such as acetophenones, benzophenones, Michler's ketone, benzoin, benzyl methyl ketal, benzoyl benzoate, α-acyloxime esters, thioxanthones, onium salts, sulfonic acid esters, organometallic complexes, etc. of photocationic polymerization initiators.
As a curing agent, compounds such as polyisocyanate, amino resin, epoxy resin, and carboxylic acid can be appropriately used in accordance with the compatible resin.

Further, the functional layer 30 contains antistatic agents, antioxidants, leveling agents, antiblocking agents, slip agents, flame retardants, ultraviolet absorbers, dispersants, flocculants, pigments, Additives such as dyes and lubricants can be contained as appropriate.

The thickness of the functional layer 30 is 0.01 μm or more and 100 μm or less, preferably 1 μm or more and 10 μm or less, more preferably 2 μm or more and 5 μm or less. By having such a thickness, the functional layer 30 improves adhesion with the easy-adhesion layer 20, and maintains sufficient adhesion even after long-term exposure under harsh environments such as high temperature and high humidity.
The thickness of the functional layer 30 is measured by, for example, a reflection spectroscopic film thickness meter (FE-300UV: Otsuka Electronics Co., Ltd.).

The function of the functional layer 30 is not particularly limited. can be selected as appropriate. Even when a function such as a hard coat layer that impairs adhesion due to the large contraction of the film is selected, by satisfying the conditions of the easy adhesion layer 20 and the functional layer 30 of the present invention, the adhesion can be effectively improved. can be improved.

Next, the back coat layer 40 will be explained. In the functional member of the present invention, the easy-adhesion layer 20 and the functional layer 30 are laminated in this order on at least one surface of the substrate, but the back coat layer 40 may be provided as necessary. . The backcoat layer 40 is not particularly limited, and a layer having necessary functions can be appropriately used depending on the application. The easy-adhesion layer 20 and the functional layer 30 may be provided as the backcoat layer 40 , and surface treatment may be performed between the substrate 10 and the backcoat layer 40 .

Next, an example of the method for producing the functional member of the present invention will be described. The method for producing the functional member of the present invention is not particularly limited. It can be produced by coating the base material 10 by the method described above, drying it, and irradiating it with ionizing radiation such as ultraviolet rays as necessary. Furthermore, on the easy adhesion layer 20, the functional layer coating liquid obtained by dissolving or dispersing the material of the functional layer 30 described above in an appropriate solvent is applied by a known method, dried, and if necessary, ionized by ultraviolet rays or the like. It can be produced by irradiating radiation.

When the back coat layer 40 is provided, a back coat layer coating liquid dissolved or dispersed in an appropriate solvent is applied to the surface of the substrate 10 having the functional layer 30 on the side opposite to the functional layer 30. It can be produced by applying and drying by the method of (1) and, if necessary, irradiating ionizing radiation such as ultraviolet rays.

The coating method (film formation method) of the easy-adhesion layer 20, the functional layer 30, and the back coat layer 40 is not particularly limited, and examples thereof include spin coating, extrusion die coating, blade coating, bar coating, and screen printing. , a stencil printing method, a roll coating method, a spray coating method, a dip coating method, an inkjet method, and the like can be used.

At this time, the application order of the easy-adhesion layer 20, the functional layer 30, and the back coat layer 40 can be appropriately selected from the viewpoint of productivity and the like.
Further, a functional layer may be laminated and applied on the functional layer 30 or the back coat layer 40 as necessary.

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

Adhesion is based on the cross-cut peeling test specified in JIS K 5400, in which no treatment is performed after the functional member is produced (hereinafter referred to as "initial adhesion test"), and an accelerated weather resistance test. After exposure for a certain period of time in an environment with a temperature of 85°C and a humidity of 85% (humidification is performed with pure water) (hereinafter referred to as "adhesion test after exposure to high temperature and high humidity"). A condition in which 1/4 or more of the 80 or more squares out of 100 squares in the cross-cut pattern of each test piece are free from peeling is determined to be acceptable.

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

Examples and comparative examples of the functional member of the present invention are described below. In the following examples and comparative examples, "%" and "parts" are by weight unless otherwise specified.

[Example 1]
One surface of a polyethylene terephthalate film (Lumirror T60: Toray Industries, Inc.) having a thickness of 100 μm was subjected to a corona discharge treatment, and the easy-adhesion layer coating solution A having the formulation shown in Table 1 was applied to the surface-treated surface, dried, and the thickness was reduced. An easy-adhesion layer of 1.5 μm was formed. Next, the functional layer coating liquid A having the formulation shown in Table 2 was applied on the easy adhesion layer, dried, and then cured by irradiation with ultraviolet rays to form a functional layer having a thickness of 3 μm. A member was produced.

<Production of polyester resin A aqueous dispersion>
83 parts of terephthalic acid, 83 parts of isophthalic acid, 93 parts of ethylene glycol, 32 parts of diethylene glycol and 0.1 part of zinc acetate as a catalyst were charged into a flask equipped with a nitrogen inlet tube, a thermometer, a stirrer and a still at 190 to 220°C. The mixture was heated for 13 hours for an esterification reaction to obtain polyester glycol. 100 parts of the obtained polyester glycol, 100 parts of xylene and 35 parts of pyromellitic anhydride were charged into a flask equipped with the same equipment as above and reacted at 140° C. for 1 hour. The temperature was raised to 180°C over 2 hours and held for an additional hour. As a result, a polyester resin A having a molecular weight of 18,000 was obtained. 25 parts of the obtained polyester resin A was added to a mixed solution of 15 parts of isopropanol and 60 parts of ion-exchanged water, and the mixture was stirred at 70 to 80° C. for 3 hours to obtain an aqueous dispersion of polyester resin A having a solid concentration of 25%. The solid content acid value of the polyester resin A aqueous dispersion was 130 mgKOH/g.

<Production of polyester resin B aqueous dispersion>
83 parts of terephthalic acid, 36 parts of isophthalic acid, 32 parts of ethylene glycol and 46 parts of neopentyl glycol are charged into a flask equipped with a nitrogen inlet tube, a thermometer, a stirrer and a still, and heated at 260° C. for 4 hours for an esterification reaction. did 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. A polycondensation reaction was further carried out under these conditions for 4 hours, resulting in a polyester resin B having a molecular weight of 18,400. 25 parts of the obtained polyester resin B was added to a mixed solution of 15 parts of isopropanol and 60 parts of deionized water, and the mixture was stirred at 70 to 80° C. for 3 hours to obtain an aqueous polyester resin B dispersion with a solid concentration of 25%. The solid content acid value of the polyester resin B aqueous dispersion was 1.0 mgKOH/g.

<Production of aqueous acrylic resin dispersion>
18 parts of ion-exchanged water and 3 parts of Eleminol RS-3000 (Sanyo Chemical Industries, Ltd., anionic surfactant, solid content concentration 50%) were charged in a beaker, and 71 parts of methyl methacrylate and 29 parts of butyl acrylate were added while stirring. , to prepare a monomer emulsion. Next, 37.5 parts of ion-exchanged water, 1 part of eleminol RS-3000 and 0.5 parts of potassium persulfate are charged in a flask equipped with a condenser, a funnel for dropping monomers, a thermometer and a stirrer, and the mixture is replaced with nitrogen while stirring. Thereafter, heating was started, and the monomer emulsion was added dropwise at 75° C. over 4 hours. After the completion of dropping, the mixture was stirred at a liquid temperature of 75 to 85°C for 4 hours and then cooled. As a result, an acrylic resin with a molecular weight of 400,000 was obtained. Further, ion-exchanged water was added to obtain an aqueous acrylic resin dispersion having a solid concentration of 25%. The solid content acid value of the aqueous acrylic resin dispersion was 0.5 mgKOH/g.

[Example 2]
A functional member of Example 2 was produced in the same manner as in Example 1, except that the corona discharge treatment of Example 1 was not performed.

[Example 3]
A functional member of Example 3 was produced in the same manner as in Example 1 except that the functional layer coating solution B shown in Table 2 was used instead of the functional layer coating solution A of Example 1.

[Example 4]
A functional member of Example 4 was produced in the same manner as in Example 1, except that the functional layer coating solution C shown in Table 2 was used instead of the functional layer coating solution A of Example 1.

[Example 5]
Except for changing the easy-adhesion layer coating solution A of Example 1 to the easy-adhesion layer coating solution B shown in Table 1 and changing the functional layer coating solution A to the functional layer coating solution D shown in Table 2, A functional member of Example 5 was produced in the same manner as in Example 1.

[Example 6]
Except for changing the easy-adhesion layer coating solution A of Example 1 to the easy-adhesion layer coating solution C shown in Table 1 and changing the functional layer coating solution A to the functional layer coating solution D shown in Table 2, A functional member of Example 6 was produced in the same manner as in Example 1.

[Example 7]
Except for changing the easy-adhesion layer coating solution A of Example 1 to the easy-adhesion layer coating solution D shown in Table 1 and changing the functional layer coating solution A to the functional layer coating solution D shown in Table 2, A functional member of Example 7 was produced in the same manner as in Example 1.

[Example 8]
Except for changing the easy-adhesion layer coating solution A of Example 1 to the easy-adhesion layer coating solution E shown in Table 1 and changing the functional layer coating solution A to the functional layer coating solution D shown in Table 2, A functional member of Example 8 was produced in the same manner as in Example 1.

[Example 9]
Except for changing the easy-adhesion layer coating solution A of Example 1 to the easy-adhesion layer coating solution F shown in Table 1 and changing the functional layer coating solution A to the functional layer coating solution D shown in Table 2, A functional member of Example 9 was produced in the same manner as in Example 1.

[Example 10]
Except for changing the easy-adhesion layer coating solution A of Example 1 to the easy-adhesion layer coating solution G shown in Table 1 and changing the functional layer coating solution A to the functional layer coating solution D shown in Table 2, A functional member of Example 10 was produced in the same manner as in Example 1.

[Example 11]
Except for changing the easy-adhesion layer coating solution A of Example 1 to the easy-adhesion layer coating solution H shown in Table 1 and changing the functional layer coating solution A to the functional layer coating solution D shown in Table 2, A functional member of Example 11 was produced in the same manner as in Example 1.

[Comparative Example 1]
A functional member of Comparative Example 1 was prepared in the same manner as in Example 1, except that the functional layer coating solution E shown in Table 2 was used instead of the functional layer coating solution A of Example 1.

[Comparative Example 2]
A functional member of Comparative Example 2 was produced in the same manner as in Example 1, except that the easy-adhesion layer coating solution A in Example 1 was changed to the easy-adhesion layer coating solution I shown in Table 1.

[Comparative Example 3]
A functional member of Comparative Example 3 was produced in the same manner as in Example 1 except that the functional layer coating solution F in Table 2 was used instead of the functional layer coating solution A of Example 1.

[Comparative Example 4]
A functional member of Comparative Example 4 was produced in the same manner as in Example 1 except that the functional layer coating solution G shown in Table 2 was used instead of the functional layer coating solution A of Example 1.

[Comparative Example 5]
A functional member of Comparative Example 5 was produced in the same manner as in Example 1, except that the easy-adhesion layer coating solution A of Example 1 was changed to the easy-adhesion layer coating solution J shown in Table 1.

Table 1

Table 2

The following characteristics were evaluated for the easy-adhesion layer coating liquid, the functional layer coating liquid, and the functional member prepared in the above Examples and Comparative Examples.

<Calculation of solid content acid value>
The acid value and the , and the solid content acid value was calculated from the solid content concentration of each coating liquid. Table 3 shows the calculation results.

<Adhesion test>
1. Initial Adhesion Test The functional layer surfaces of the functional members produced in the above-described Examples and Comparative Examples were tested based on the cross-cut peel test specified in JIS K 5400 and evaluated according to the following criteria. "A" indicates a state in which no peeling of 1/4 or more is observed in any of the 100 squares in the grid, and a state in which 1/4 or more of peeling is not observed in 80 or more of the 100 squares. "O" was given, and "X" was given when less than 80 squares out of 100 squares did not show peeling in 1/4 or more of the squares. Table 3 shows the measurement results.

2. Adhesion Test after Exposure to High Temperature and High Humidity The functional members produced in the above Examples and Comparative Examples were exposed for 500 hours in an environment at a temperature of 85° C. and a humidity of 85% (humidification was performed with pure water). After that, the surface of the functional layer was tested based on the cross-cut peeling test specified in JIS K 5400 and evaluated according to the following criteria. "A" indicates a state in which no peeling of 1/4 or more is observed in any of the 100 squares in the grid, and a state in which 1/4 or more of peeling is not observed in 80 or more of the 100 squares. "O" was given, and "X" was given when less than 80 squares out of 100 squares did not show peeling in 1/4 or more of the squares. Table 3 shows the measurement results.

Table 3

As is clear from the results in Table 3, the functional members of Examples 1 to 11 had a solid content acid value of 10.0 mgKOH/g or more of the composition for forming an easy-adhesion layer on the substrate, and functioned Since the solid content acid value of the composition for forming the layer was 4.0 to 12.0 mgKOH / g, both the initial adhesion test and the adhesion test after exposure to high temperature and high humidity were evaluated well, and easy adhesion to the substrate. The layer adhesion and the adhesion between the easy-adhesion layer and the functional layer were excellent.

On the other hand, in Comparative Examples 2 and 5, the solid content acid value of the composition for forming the easy adhesion layer is less than 10.0 mgKOH / g, and Comparative Examples 1, 3 and 4 are functional layers Since the solid content acid value of the composition for forming is less than 4.0 mgKOH / g or exceeds 12.0 mgKOH / g, the initial adhesion between the substrate and the easy adhesion layer and / or the easy adhesion layer and the functional layer and / Or, it was inferior in adhesion after exposure to high temperature and high humidity.

DESCRIPTION OF SYMBOLS 10... Base material, 20... Easy adhesion layer, 30... Functional layer, 40... Backcoat layer

Claims (5)

A functional member in which an easy-adhesion layer and a functional layer are laminated in this order on at least one surface of a base material, wherein the solid content acid value of the composition for forming the easy-adhesion layer is 10.0 mgKOH/g or more. , the solid content acid value of the composition for forming the functional layer is 4.0 to 12.0 mgKOH/g, and the components constituting the composition for forming the functional layer include a carboxy group, a sulfo A functional member comprising one or more functional groups selected from groups, phosphoric acid groups, and phenolic hydroxy groups . 2. The functional member according to claim 1, wherein the composition for forming the easy-adhesion layer contains a polyester-acrylic composite resin as a main component. 3. The functional member according to claim 2, wherein the polyester-acrylic composite resin contains more acrylic resin components than polyester resin components on a weight basis. 4. The functional member according to any one of claims 1 to 3, wherein the surface of the base material on which the easy-adhesion layer is laminated has a polar group introduced by surface treatment. 5. The functional member according to claim 4, wherein the polar group is selected from one or more of a hydroxy group, a carboxy group and a sulfo group.

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