JP2019162807A - Functional member - Google Patents

Abstract

To improve adhesion between a base material and an easy adhesion layer and adhesion between the easy adhesion layer and a function layer, and keep sufficient adhesion even in long-time exposure under severe environment such as high temperature and high humidity.SOLUTION: A functional member has an easy adhesion layer and a function layer laminated in this order on at least one surface of a base material, in which a solid content acid value of the composition for forming the easy adhesion layer is 10.0 mgKOH/g or more, and a solid content acid value of the composition for forming the function layer is 4.0-12.0 mgKOH/g.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a functional member, a film, a sheet, and the like in which a base material, an easy-adhesion layer, and a functional layer are laminated in this order, and more specifically, a function that maintains sufficient adhesion even under severe environments such as high temperature and high humidity. The present invention relates to sex members, films, sheets and the like.

  Plastic materials are widely used as materials for electronic devices due to their light weight, proper processing, and productivity. In some cases, a plastic material is used alone, but in many cases, a functional layer having a specific function is laminated on the surface, and a function according to the application is added. Particularly in recent years, plastic materials have been used in fields that have not been used in the past as replacements for glass and metal materials, and plastic materials also have high interlayer adhesion stability in severe environments such as high temperature and high humidity. It has come to be required.

JP 09-176518 A 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 to form fibers, films, sheets, etc., but the surface is crystallized. In many cases, the adhesiveness of ink, adhesive, etc. is poor. In particular, in the case of a film, since it is highly crystallized by stretching and heat setting processes, it is known that its adhesion level is very low and adhesion is generally inferior.

  In such a case, a material having a high affinity with the plastic film can be solved by using it for the functional layer. However, the material of the functional layer is extremely limited and a necessary function may be impaired. Therefore, the adhesion between the base material and the easy-adhesion layer and the function of the easy-adhesion layer are provided by providing an easy-adhesion layer having high affinity with both layers between the base material and the functional layer as in Patent Document 1 and Patent Document 2. Techniques have been taken to improve layer adhesion. However, even in the functional plastic film provided with an easy-adhesion layer in this way, the initial adhesion is good, but when the film is exposed for a long time in a severe environment such as high temperature and high humidity, The adhesiveness of a base material and an easily bonding layer and / or the adhesiveness of an easily bonding layer and a functional layer falls, and malfunctions, such as peeling of an easily bonding layer and / or a functional layer, have occurred.

  As described above, in recent years, fields such as transparent conductive substrates for touch panels, flexible circuit boards, flexible display substrates, organic EL substrates, LED lighting substrates, etc. A plastic material is also used as a material of the device, and high initial adhesiveness that has not been conventionally required and stability over time in a severe environment such as high temperature and high humidity 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 sufficient adhesion is maintained even when exposed for a long time in a severe environment 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 acid value of the composition for forming the easy adhesion layer Is 10.0 mgKOH / g or more, and the solid content acid value of the composition for forming the functional layer is 4.0 to 12.0 mgKOH / g.

  The functional member of the present invention is preferably characterized in that the composition for forming the easy-adhesion layer is mainly composed of a polyester-acrylic composite resin.

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

  The functional member of the present invention is preferably characterized in that a polar group is introduced into the surface of the substrate on which the easy-adhesion layer is laminated by surface treatment.

  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 this invention, the adhesiveness of the base material of the said functional member and an easily bonding layer and the adhesiveness of an easily bonding layer and a functional layer can be improved. In particular, the functional member has little change in adhesion even under severe environments such as high temperature and high humidity, and good adhesion is maintained.

Basic form of 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 opposite to the surface on which the functional layer of the substrate is formed

  Hereinafter, with reference to FIG.1 and FIG.2, embodiment of the functional member which is this invention is described.

  As shown in FIG. 1, the functional member of the present invention has a base material 10, an easy adhesion layer 20, and a functional layer 30 as a basic configuration. The functional member is not limited to the one shown in FIG. 1, but may include a backcoat layer 40 (FIG. 2) on the surface opposite to the surface on which the functional layer 30 is laminated.

  First, the substrate 10 will be described. As the substrate 10, a plastic film is preferably used. As the plastic film, for example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, polystyrene, triacetyl cellulose, polymethyl methacrylate, polyvinyl chloride, polynorbornene, polyimide compound, and the like can be used. The substrate can be selected according to applications such as heat resistance, mechanical strength, dimensional stability, and tint. Among them, a polyethylene terephthalate film stretched, particularly biaxially stretched, is preferably used because of its excellent mechanical strength and dimensional stability.

  The thickness of the substrate 10 is not particularly limited and can be appropriately selected depending on the applied material. However, in consideration of handleability, the thickness is generally 1 μm or more and 300 μm or less, and preferably 23 μm or more and 188 μm or less.

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

  Here, examples of the polar group introduced by the surface treatment include a carboxy group, an epoxy group, a hydroxy group, a carbonyl group, a hydroperoxy group, and a sulfo group, and preferably a hydroxy group, a carboxy group, or a sulfo group. It is desirable to select any one or more of these.

  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 acid value, and a compound such as an ionizing radiation curable resin, a thermosetting resin, or a thermoplastic resin is used alone or in combination. These 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. It is considered that a hydrogen bond is formed between the easy-adhesion layer 20 and the functional layer 30 and the adhesion is improved by having a valence.
Moreover, although adhesiveness with the base material 10 changes with the raw materials of the base material 10, when adhesiveness is not enough, adhesiveness can be improved by performing the surface treatment mentioned above to the base material 10. FIG.
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 formed between the base material 10 and the easy-adhesion layer 20, and the adhesion is further 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, or a phenolic hydroxy group into the 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 / in order to improve 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. g or more is desirable, more preferably 10.5 mgKOH / g or more, and most preferably 11.0 mgKOH / g or more. When the solid content acid value is less than 10.0 mgKOH / g, a sufficient amount of hydrogen bonds for expressing the initial adhesion is not formed, and the adhesion between the substrate 10 and the easy-adhesion layer 20 and the easy-adhesion layer 20 In some cases, the adhesion of the functional layer 30 may decrease.
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.

It is desirable that the composition has a polyester-acrylic composite resin as a main component. By using the polyester-acrylic composite resin as a 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 either 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 they may be combined. Examples of the compound containing both a polyester component and an acrylic component as constituent components include a polyester-acrylic copolymer. Considering the storage stability of the composition and the transparency and smoothness of the film, it is desirable that the composition contains both a polyester component and an acrylic component as constituent components.

  Moreover, the component ratio of polyester and acrylic in the polyester-acrylic composite resin is not necessarily limited, but it is desirable that the constituent components of the acrylic resin occupy more than the constituent components of the polyester resin on a weight basis. For example, the content of the main acrylic resin component is preferably 51 to 99% by weight, and more preferably 60 to 97% by weight. Within this range, 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 further improved.

  Furthermore, the easy-adhesion layer 20 has an antistatic agent, an antioxidant, a leveling agent, an antiblocking agent, a slip agent, a flame retardant, an ultraviolet absorber, a dispersant, an aggregating agent, and a pigment within the range not impairing the functions of the present invention. Additives such as dyes and lubricants can be appropriately contained.

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, more preferably 0.5 μm or more and 2 μm or less. By having such a thickness, 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 improved, and in a long-time exposure in a severe environment such as high temperature and high humidity. However, sufficient adhesion is maintained.
The thickness of the easy-adhesion layer 20 is measured by, for example, a reflection spectral film thickness meter (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 has a specific solid acid value, and a compound such as an ionizing radiation curable resin, a thermosetting resin, or a thermoplastic resin may be used alone or in combination. These can be combined, and can be used properly according to the purpose.

  As such an ionizing radiation curable resin, an ionizing radiation (ultraviolet ray or electron beam) is irradiated to an ionizing radiation curable coating material in which one or more of a photopolymerizable prepolymer or a photopolymerizable monomer is mixed. Can be used. Here, as the photopolymerizable prepolymer, an acrylic prepolymer having one or more (meth) acryloyl groups in one molecule is particularly preferably used. Examples of the acrylic prepolymer 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; for example, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, diethylene glycol diacrylate Bifunctional acrylic monomers such as acrylate, polyethylene glycol diacrylate, and hydroxypivalate neopentyl glycol diacrylate; for example, polyfunctional (3 or more functional) 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 the thermosetting resin include polyester acrylate resins, polyurethane acrylate resins, epoxy acrylate resins, epoxy resins, melamine resins, phenol resins, and silicone resins.

  Examples of the thermoplastic resin include polyester resins, acrylic resins, polycarbonate resins, cellulose resins, acetal resins, vinyl resins, polyethylene resins, polystyrene resins, polypropylene resins, polyamide resins, and polyimides. Resin, fluorine resin 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 described above, it is most preferably 5.0 mgKOH / g or more, preferably 12.0 mgKOH / g or less, more preferably 11.0 mgKOH / g or less, and most preferably 9.0 mgKOH / g or less. If the solid content acid value is less than 4.0 mgKOH / g, a sufficient amount of hydrogen bonds for expressing adhesion between the easy-adhesion layer 20 and the functional layer 30 is not formed. The adhesion of the layer 30 may be reduced, and if it is larger than 12.0 mgKOH / g, for example, side reactions such as ester hydrolysis occur, and hydrogen bonds formed between the easy-adhesion layer 20 and the functional layer 30 The amount may decrease, and the adhesion between the easy-adhesion layer 20 and the functional layer 30 may decrease.
The solid content acid value can be determined 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 carboxy group, a sulfo group, a phosphoric acid group, or a phenolic hydroxy group into the components constituting the composition. be able to.

The functional layer 30 may further contain a photoinitiator, a curing agent, or the like depending on the curing method.
As photoinitiators, photo radical polymerization initiators such as acetophenones, benzophenones, Michler's ketone, benzoin, benzylmethyl ketal, benzoylbenzoate, α-acyloxime esters, thioxanthones, onium salts, sulfonate esters, organometallic complexes, etc. Photocationic polymerization initiators of
Moreover, as a hardening | curing agent, compounds, such as polyisocyanate, an amino resin, an epoxy resin, and a carboxylic acid, can be suitably used according to the resin which suits.

  Furthermore, the functional layer 30 has an antistatic agent, an antioxidant, a leveling agent, an anti-blocking agent, a slip agent, a flame retardant, an ultraviolet absorber, a dispersant, an aggregating agent, a pigment, within a range that does not impair the function of the present invention. Additives such as dyes and lubricants can be appropriately contained.

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 the adhesion with the easy-adhesion layer 20, and sufficient adhesion is maintained even when exposed for a long time in a severe environment such as high temperature and high humidity.
The thickness of the functional layer 30 is measured by, for example, a reflection spectral film thickness meter (FE-300UV: Otsuka Electronics Co., Ltd.).

  The function of the functional layer 30 is not particularly limited. For example, an antiglare layer, a hard coat layer, an antireflection layer, an antifouling layer, an antibacterial layer, a barrier layer, a light shielding layer, an index matching layer, an antistatic layer, etc. Can be selected as appropriate. Even when a function such that the adhesion is impaired due to the large shrinkage of the film such as a hard coat layer is selected, the adhesion can be effectively achieved by satisfying the conditions of the easy adhesion layer 20 and the functional layer 30 of the present invention. Can be improved.

  Next, the back coat layer 40 will be described. 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 base material, respectively, but a backcoat layer 40 may be provided as necessary. . The back coat layer 40 is not particularly limited, and a layer having a necessary function can be appropriately used depending on the application. The easy-adhesion layer 20 and the functional layer 30 may be provided as the back coat layer 40, or a surface treatment may be performed between the substrate 10 and the back coat layer 40.

  Next, an example of a 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. For example, a coating solution for an easy adhesion layer in which the material of the easy adhesion layer 20 described above is dissolved or dispersed in an arbitrary base material 10 is publicly known. It can be produced by coating and drying on the substrate 10 by the method described above, and irradiating with ionizing radiation such as ultraviolet rays as necessary. Further, a functional layer coating solution obtained by dissolving or dispersing the above-described functional layer 30 material in an appropriate solvent is applied and dried on the easy adhesion layer 20 by a known method, and ionization such as ultraviolet rays is performed as necessary. Can be produced by irradiation.

  When the backcoat layer 40 is provided, a backcoat layer coating solution dissolved or dispersed in a suitable solvent is known on the surface of the substrate 10 provided with the functional layer 30 on the side opposite to the functional layer 30. It can be prepared by applying and drying by the above method, and irradiating with ionizing radiation such as ultraviolet rays if necessary.

  The coating method (film forming method) for the easy-adhesion layer 20, the functional layer 30, and the back coat layer 40 is not particularly limited. For example, a spin coating method, an extrusion die coating method, a blade coating method, a bar coating method, a screen printing method. A known coating method such as a stencil printing method, a roll coating method, a spray coating method, a dip coating method, or an ink jet method can be used.

At this time, the order of application of the easy-adhesion layer 20, the functional layer 30, and the backcoat layer 40 can be appropriately selected from the viewpoint of productivity and the like.
Further, if necessary, a functional layer may be further laminated 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 characteristic that the functional member should have is initial adhesion and adhesion after being exposed for a long time in a severe environment such as high temperature and high humidity.

  Adhesion is based on a cross-cut peel test specified in JIS K 5400, with no treatment after the functional member is fabricated (hereinafter referred to as “initial adhesion test”), and accelerated weathering test. The test is conducted in two conditions: after exposure for a certain period in an environment of 85 ° C and 85% humidity (humidification is performed in pure water) (hereinafter referred to as "adhesion test after exposure to high temperature and high humidity"). In addition, a state in which peeling of more than a quarter is not observed in 80 squares or more out of 100 square grids of various test pieces is regarded as 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 with time due to long-term exposure in a severe environment such as high temperature and high humidity, and good adhesion is maintained.

  Examples of the functional member of the present invention and comparative examples will be described below. In the following examples and comparative examples, “%” and “parts” are based on weight unless otherwise specified.

[Example 1]
One surface of a 100 μm thick polyethylene terephthalate film (Lumirror T60: Toray Industries, Inc.) is subjected to corona discharge treatment, and the surface treatment surface is coated with the coating liquid A for the easy adhesion layer shown in Table 1 and dried. An easy adhesion layer of 1.5 μm was formed. Next, the functional layer coating solution A having the formulation shown in Table 2 was applied onto 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 prepared.

<Manufacture 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 introduction tube, a thermometer, a stirrer and a distiller at 190 to 220 ° C. Esterification reaction was performed by heating for 13 hours 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 device as described above, and reacted at 140 ° C. for 1 hour. The temperature was raised to 180 ° C. over 2 hours and further kept for 1 hour. As a result, a polyester resin A having a molecular weight of 18000 was obtained. 25 parts of the obtained polyester resin A was charged into a mixed solution of 15 parts of isopropanol and 60 parts of ion-exchanged water and stirred at 70 to 80 ° C. for 3 hours to obtain a polyester resin A aqueous dispersion having a solid content concentration of 25%. The solid content acid value of the polyester resin A aqueous dispersion was 130 mgKOH / g.

<Manufacture of polyester resin B aqueous dispersion>
Esterification reaction by charging 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 inlet tube, thermometer, stirrer and distiller and heating at 260 ° C. for 4 hours. Went. 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. As a result of further polycondensation reaction for 4 hours under these conditions, a polyester resin B having a molecular weight of 18400 was obtained. 25 parts of the obtained polyester resin B was charged into a mixed solution of 15 parts of isopropanol and 60 parts of ion-exchanged water and stirred at 70 to 80 ° C. for 3 hours to obtain a polyester resin B aqueous dispersion having a solid content concentration of 25%. The solid content acid value of the polyester resin B aqueous dispersion was 1.0 mgKOH / g.

<Manufacture of acrylic resin aqueous dispersion>
In a beaker, 18 parts of ion-exchanged water and 3 parts of Eleminol RS-3000 (Sanyo Kasei Kogyo Co., Ltd., anionic surfactant, solid content concentration 50%) were charged, and 71 parts of methyl methacrylate and 29 parts of butyl acrylate were added while stirring. A monomer emulsion was prepared. Next, a flask equipped with a condenser, a monomer dropping funnel, a thermometer and a stirrer was charged with 37.5 parts of ion-exchanged water, 1 part of Eleminol RS-3000 and 0.5 part of potassium persulfate, and replaced with nitrogen while stirring. Thereafter, heating was started and the monomer emulsion was added dropwise 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. As a result, an acrylic resin having a molecular weight of 400,000 was obtained. Further, ion exchange water was added to obtain an acrylic resin aqueous dispersion having a solid content concentration of 25%. The solid content acid value of the acrylic resin aqueous dispersion was 0.5 mgKOH / g.

[Example 2]
A functional member of Example 2 was produced in the same manner as 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 liquid A of Example 1 was changed to the functional layer coating liquid B shown in Table 2.

[Example 4]
A functional member of Example 4 was produced in the same manner as in Example 1 except that the functional layer coating liquid A of Example 1 was changed to the functional layer coating liquid C shown in Table 2.

[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 Example 1.

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

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

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

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

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

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

[Comparative Example 1]
A functional member of Comparative Example 1 was produced in the same manner as in Example 1 except that the functional layer coating liquid A of Example 1 was changed to the functional layer coating liquid E shown in Table 2.

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

[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 liquid A of Example 1 was changed to the functional layer coating liquid G shown in Table 2.

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

Table 1

Table 2

  The following characteristics were evaluated about the coating liquid for easily bonding layers, the coating liquid for functional layers, and the functional member which were produced by the Example and comparative example which were mentioned above.

<Calculation of solid content acid value>
The acid values determined by the indicator titration method defined in JIS K 2501: 2003 for the easy-adhesion layer coating solution and the functional layer coating solution of Examples 1 to 11 and Comparative Examples 1 to 5 described above, respectively. The value calculated from the solid content concentration of each coating solution was defined as the solid content acid value. The calculation results are shown in Table 3.

<Adhesion test>
1. Initial adhesion test The functional layer surfaces of the functional members prepared in the above-described examples and comparative examples were tested based on a cross-cut peel test defined by JIS K 5400, and evaluated according to the following criteria. “◎” indicates that no more than a quarter of the 100 squares are peeled off, and “80” indicates that no more than a quarter of the 100 squares is peeled. “◯” represents a state in which 100% of squares in which no more than a quarter of peeling was observed was less than 80 squares. The measurement results are shown in Table 3.

2. Adhesion test after exposure to high temperature and high humidity The functional members prepared in the examples and comparative examples described above were exposed for 500 hours in an environment of a temperature of 85 ° C. and a humidity of 85% (humidification was performed in pure water). Thereafter, the functional layer surface was tested based on a cross-cut peel test defined by JIS K 5400 and evaluated according to the following criteria. “◎” indicates that no more than a quarter of the 100 squares are peeled off, and “80” indicates that no more than a quarter of the 100 squares is peeled. “◯” represents a state in which 100% of squares in which no more than a quarter of peeling was observed was less than 80 squares. The measurement results are shown in Table 3.

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 in the composition for forming an easy-adhesion layer on the substrate. Since the solid content acid value of the composition for forming the layer was 4.0 to 12.0 mg KOH / g, both the initial adhesion test and the adhesion test after exposure to high temperature and high humidity were evaluated well, and easily adhered to the substrate. The adhesion between the layers 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 Example 1, Comparative Example 3, and Comparative Example 4 are functional layers. Since the solid content acid value of the composition for forming an aqueous solution was less than 4.0 mgKOH / g or more than 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 Or it was inferior to adhesiveness after high temperature, high humidity exposure.

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 substrate, and the solid content acid value of the composition for forming the easy-adhesion layer is 10.0 mgKOH / g or more The functional member having a solid content acid value of 4.0 to 12.0 mgKOH / g for forming the functional layer.   The functional member according to claim 1, wherein the composition for forming the easy-adhesion layer is mainly composed of a polyester-acrylic composite resin.   The functional member according to claim 2, wherein the polyester-acrylic composite resin occupies more constituent components of the acrylic resin than the constituent components of the polyester resin on a weight basis.   The functional member according to claim 1, wherein a polar group is introduced into the surface of the base material on which the easy adhesion layer is laminated by surface treatment.   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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