CN111601709A

CN111601709A - Functional member

Info

Publication number: CN111601709A
Application number: CN201980008786.2A
Authority: CN
Inventors: 船桥洋平; 佐濑辉弘; 岸幸生; 奈良英明
Original assignee: Kimoto Co Ltd
Current assignee: Kimoto Co Ltd
Priority date: 2018-03-20
Filing date: 2019-03-11
Publication date: 2020-08-28
Anticipated expiration: 2039-03-11
Also published as: JP7138459B2; WO2019181616A1; JP2019162807A; KR20200133723A; CN111601709B; TW201940343A

Abstract

The invention aims to improve the adhesion between a base material and an easy-bonding layer and the adhesion between the easy-bonding layer and a functional layer, and maintain sufficient adhesion even exposed to severe environments such as high temperature and high humidity for a long time. In order to achieve the object, a 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 substrate, wherein a solid acid value of a composition for forming the easy-adhesion layer is 10.0mgKOH/g or more, and a solid acid value of a composition for forming the functional layer is 4.0 to 12.0 mgKOH/g.

Description

Functional member

Technical Field

The present invention relates to a functional member, film, sheet, and the like, in which a substrate, an easy-adhesion layer, and a functional layer are sequentially laminated, and more particularly, to a functional member, film, sheet, and the like, which can maintain sufficient adhesion even in a severe environment such as high temperature and high humidity.

Background

Plastic materials are widely used as materials for electronic devices because of their lightweight properties, processability, and productivity. Plastic materials may be used alone, but in many cases, a functional layer having a specific function is laminated on a surface thereof, and a function according to a use is added. In particular, in recent years, plastic materials have been used in fields that have not been used so far, instead of glass or metal materials, and accordingly, plastic materials are also required to have high interlayer adhesion stability in severe environments such as high temperature and high humidity.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. H09-176518

Patent document 2: international publication No. 2015/170560

Disclosure of Invention

Problems to be solved by the invention

However, although thermoplastic resins such as polyesters, polyamides, polystyrenes, polyolefins, polycarbonates, and polyimides, which are raw materials for plastic materials, are usually formed into fibers, films, sheets, and the like by melting, the surfaces thereof are often crystallized, and the adhesiveness of inks, adhesives, and the like is poor. Among them, it is known that in the case of a film, since crystal orientation is highly performed by the steps of stretching and heat-setting, the level of adhesiveness is very low and adhesiveness is generally poor.

This problem can be solved by using a material having high affinity with the plastic film for the functional layer, but the material of the functional layer is extremely limited, and the necessary functions are sometimes impaired. Therefore, as in patent documents 1 and 2, a method is employed in which an easy-adhesion layer having a high affinity for both layers is provided between a base material and a functional layer, thereby improving the adhesion between the base material and the easy-adhesion layer and the adhesion between the easy-adhesion layer and the functional layer. However, although the functional plastic film provided with the easy-adhesion layer as described above has good initial adhesion, when the film is exposed to a severe environment such as high temperature and high humidity for a long time, the adhesion between the base material and the easy-adhesion layer and/or the adhesion between the easy-adhesion layer and the functional layer are reduced, and a problem such as peeling of the easy-adhesion layer and/or the functional layer occurs.

As described above, in recent years, plastic materials have been used in fields that have not been used so far, for example, materials for electronic devices such as transparent conductive substrates for touch panels, flexible circuit substrates, substrates for flexible displays, substrates for organic EL, and substrates for LED lighting, and high initial adhesion and adhesion stability with time under severe environments such as high temperature and high humidity, which have not been required so far, have been required.

The invention aims to improve the adhesion between a base material and an easy-bonding layer and the adhesion between the easy-bonding layer and a functional layer, and maintain sufficient adhesion even exposed to severe environments such as high temperature and high humidity for a long time.

Means for solving the problems

The functional member is characterized in that an easy-adhesion layer and a functional layer are sequentially laminated on at least one surface of a substrate, wherein the solid acid value of a composition for forming the easy-adhesion layer is 10.0mgKOH/g or more, and the solid acid value of a composition for forming the functional layer is 4.0 to 12.0 mgKOH/g.

In addition, 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.

In the functional member of the present invention, the constituent component of the acrylic resin is preferably more than the constituent component of the polyester resin in the polyester-acrylic composite resin on a weight basis.

In the functional member of the present invention, it is preferable that the surface of the base material on which the easy-adhesion layer is laminated is surface-treated to introduce a polar group.

The functional member of the present invention is preferably characterized in that the polar group is at least one group selected from the group consisting of a hydroxyl group, a carboxyl group and a sulfonic acid group.

Effects of the invention

According to the present invention, the adhesion between the base material of the functional member and the easy-adhesion layer and the adhesion between the easy-adhesion layer and the functional layer can be improved. In particular, even in a severe environment such as high temperature and high humidity, the functional member has little change in adhesion, and can maintain good adhesion.

Drawings

Fig. 1 shows a basic form of the functional member of the present invention.

Fig. 2 shows a functional member according to the present invention, wherein a back coating layer is applied to the surface of the substrate opposite to the surface on which the functional layer is formed.

Detailed Description

Embodiments of the functional member according to the present invention will be described below with reference to fig. 1 and 2.

As shown in fig. 1, the basic structure of the functional member of the present invention includes a substrate 10, an easy-adhesion layer 20, and a functional layer 30. The functional member may be provided with a back surface coating layer 40 (fig. 2) on the surface opposite to the surface on which the functional layer 30 is laminated, in addition to the functional member shown in fig. 1.

First, the substrate 10 is explained. As the substrate 10, a plastic film is suitably used. Examples of the plastic film include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, polystyrene, triacetyl cellulose, polymethyl methacrylate, polyvinyl chloride, polynorbornene, and polyimide compounds, and a substrate can be selected depending on the use such as transparency, heat resistance, mechanical strength, dimensional stability, and color tone. Among them, a polyethylene terephthalate film subjected to stretching processing, particularly biaxial stretching, is suitable for use because it is excellent in mechanical strength and dimensional stability.

The thickness of the substrate 10 is not particularly limited, and may be suitably selected depending on the material to be used, and is generally 1 μm to 300 μm, preferably 23 μm to 188 μm in consideration of workability.

The substrate 10 may be subjected to a surface treatment such as a plasma treatment, a corona discharge treatment, or a far ultraviolet irradiation treatment. By applying these surface treatments, the wettability of the easy-adhesion layer 20 to the substrate 10 becomes good, and the adhesion can be improved. In particular, when the polar group introduced by the plasma treatment or the corona discharge treatment is a specific functional group, hydrogen bonds are formed with a composition having a specific solid acid value for forming the easy-adhesion layer 20 described later, and the adhesion is further improved.

Examples of the polar group introduced by the surface treatment include a carboxyl group, an epoxy group, a hydroxyl group, a carbonyl group, a hydroperoxy group (hydroxyl group), a sulfonic acid group, and the like, and it is preferably at least one selected from the group consisting of a hydroxyl group, a carboxyl group, and a sulfonic acid group.

Next, the easy adhesion layer 20 will be described. The easy-adhesion layer 20 is not particularly limited as long as it is formed of a composition having a specific solid acid value, and compounds such as an ionizing radiation curable resin, a thermosetting resin, and a thermoplastic resin may be used singly or in combination of 2 or more, and may be used separately according to the purpose.

The mechanism of adhesion is not clear, but it is considered that: the composition for forming the easy-adhesion layer 20 has a specific solid acid value, and the composition for forming the functional layer 30, which will be described later, has a specific solid acid value, whereby hydrogen bonds are formed between the easy-adhesion layer 20 and the functional layer 30, and adhesion is improved.

Further, although the adhesion to the substrate 10 varies depending on the material of the substrate 10, when the adhesion is insufficient, the adhesion can be improved by subjecting the substrate 10 to the surface treatment.

When the polar group introduced into the substrate 10 by the surface treatment is the specific functional group as described above, a hydrogen bond is also formed between the substrate 10 and the easy-adhesion layer 20, and adhesion is further improved.

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

The solid acid value of the composition for forming the easy-adhesive layer 20 is preferably 10.0mgKOH/g or more, more preferably 10.5mgKOH/g or more, and most preferably 11.0mgKOH/g or more, in order 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. When the solid acid value is less than 10.0mgKOH/g, a sufficient amount of hydrogen bonds for exhibiting the above-described adhesion cannot be formed, and 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 may be reduced.

The acid value of the solid content in the present invention is determined by the following equation in accordance with JIS K2501: a value calculated from the acid value and the solid content concentration thereof obtained by the indicator titration method specified in 2003.

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 amount of the component exceeds 50 parts by weight per 100 parts by weight of the total solid content of the components constituting the composition.

The polyester-acrylic composite resin may be a mixture of a polyester resin and an acrylic resin, or a compound containing at least both of a polyester component and an acrylic component as constituent components, or may be a composite of these. Examples of the compound containing both a polyester component and an acrylic component as constituent components include polyester-acrylic copolymers and the like. In view of the storage stability of the composition and the transparency or smoothness of the film, a compound containing both a polyester component and an acrylic component as constituent components is preferred.

The ratio of the polyester to the acrylic component in the polyester-acrylic composite resin is not necessarily limited, but the acrylic resin preferably accounts for a larger amount of the polyester resin than the acrylic 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.

The easy-adhesion layer 20 may contain additives such as antistatic agents, antioxidants, leveling agents, antiblocking agents, slip agents, flame retardants, ultraviolet absorbers, dispersants, flocculants, pigments, dyes, and lubricants as appropriate within a range not to impair the function of the present invention.

The thickness of the easy adhesion layer 20 is 0.01 μm to 50 μm, preferably 0.1 μm to 5 μm, and more preferably 0.5 μm to 2 μm. By having such a thickness, the adhesion between the base 10 and the easy-adhesion layer 20 and the adhesion between the easy-adhesion layer 20 and the functional layer 30 can be improved, and sufficient adhesion can be maintained even when exposed to a severe environment such as high temperature and high humidity for a long time.

The thickness of the easy-adhesion layer 20 can be measured by a reflection spectrophotometer (FE-300 UV: Otsuka electronics Co., Ltd.), for example.

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 acid value, and compounds such as ionizing radiation curable resins, thermosetting resins, thermoplastic resins, and the like may be used alone or in combination of 2 or more, and may be used separately according to the purpose.

As such an ionizing radiation curable resin, one obtained by irradiating 1 or 2 or more types of ionizing radiation curable coating materials mixed with a photopolymerizable prepolymer, a photopolymerizable monomer, or the like with ionizing radiation (ultraviolet rays or electron beams) and curing the coating materials can be used. Here, as the photopolymerizable prepolymer, an acrylic prepolymer having 1 or 2 or more (meth) acryloyl groups in 1 molecule is particularly preferably used. Examples of the acrylic prepolymer include urethane acrylate, polyester acrylate, epoxy acrylate, melamine acrylate, polyperfluoroalkyl acrylate, and silicone acrylate.

In addition, as the photopolymerizable monomer, an acrylic monomer having 1 or 2 or more (meth) acryloyl groups in 1 molecule is particularly preferably used. Examples thereof include monofunctional acrylic monomers such as 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate and 2-butoxyethyl acrylate; 2-functional acrylic monomers such as 1, 6-hexanediol diacrylate, neopentyl glycol diacrylate, diethylene glycol diacrylate, polyethylene glycol diacrylate, hydroxypivalic acid neopentyl glycol diacrylate, and the like; polyfunctional (3-or more-functional) acrylic monomers such as dipentaerythritol hexaacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, etc.; and the like. These photopolymerizable monomers may be used alone or in combination of 2 or more. The blending ratio of the photopolymerizable prepolymer and the photopolymerizable monomer is not particularly limited, and may be appropriately set according to the purpose and the use.

Examples of the thermosetting resin include polyester acrylate resin, urethane acrylate resin, epoxy resin, melamine resin, phenol resin, and silicone resin.

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, polyimide resins, and fluorine resins.

The solid acid value of the composition for forming the functional layer 30 is preferably 4.0mgKOH/g or more, more preferably 4.5mgKOH/g or more, most preferably 5.0mgKOH/g or more, and preferably 12.0mgKOH/g or less, more preferably 11.0mgKOH/g or less, most preferably 9.0mgKOH/g or less, in order to improve the adhesion between the easy-adhesion layer 20 and the functional layer 30. When the solid acid value is less than 4.0mgKOH/g, a sufficient amount of hydrogen bonds for exhibiting adhesion are not formed between the easy-adhesion layer 20 and the functional layer 30, and thus the adhesion between the easy-adhesion layer 20 and the functional layer 30 may be reduced, and when the solid acid value is greater than 12.0mgKOH/g, for example, a side reaction such as hydrolysis of an ester occurs, and the amount of hydrogen bonds formed between the easy-adhesion layer 20 and the functional layer 30 is reduced, and thus the adhesion between the easy-adhesion layer 20 and the functional layer 30 may be reduced.

The solid acid value can be determined by the same method as the solid acid value of the composition for forming the easy-adhesion layer 20.

The acid value of the composition for forming the functional layer 30 can be adjusted by introducing a functional group such as a carboxyl group, a sulfonic acid group, a phosphoric acid group, or a phenolic hydroxyl group into the components constituting the composition.

The functional layer 30 may further include a photoinitiator, a curing agent, etc., depending on the curing method.

Examples of the photoinitiator include photo radical polymerization initiators such as acetophenones, benzophenones, michael ketone, benzoin, benzyl methyl acetal, benzoyl benzoate, α -acyloxime esters, and thioxanthones, and photo cation polymerization initiators such as onium salts, sulfonic acid esters, and organic metal complexes.

The curing agent may be suitably used according to a resin suitable for a compound such as polyisocyanate, amino resin, epoxy resin, or carboxylic acid.

The functional layer 30 may contain additives such as antistatic agents, antioxidants, leveling agents, antiblocking agents, slip agents, flame retardants, ultraviolet absorbers, dispersants, flocculants, pigments, dyes, and lubricants as appropriate within a range not to impair the functions of the present invention.

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, and more preferably 2 μm or more and 5 μm or less. By having such a thickness, the adhesion between the functional layer 30 and the easy-adhesion layer 20 can be improved, and sufficient adhesion can be maintained even when exposed to a severe environment such as high temperature and high humidity for a long time.

The thickness of the functional layer 30 is measured by, for example, a reflection spectroscopic film thickness meter (FE-300 UV: Otsuka electronics Co.).

The function of the functional layer 30 is not particularly limited, and can be appropriately selected depending on the purpose, 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, a refractive index matching layer, an antistatic layer, and the like. Even when a function that impairs adhesion due to large shrinkage of the film, such as a hard coat layer, is selected, adhesion can be effectively improved by satisfying the conditions of the easy-adhesion layer 20 and the functional layer 30 of the present invention.

Next, the back surface coating layer 40 is 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 base material, but the back surface coating layer 40 may be provided as needed. The back surface coating layer 40 is not particularly limited, and a layer having a necessary function may be suitably used depending on the use. The back coat layer 40 may be provided with the easy-adhesion layer 20 and the functional layer 30, or a surface treatment may be applied between the substrate 10 and the back coat layer 40.

Next, an example of the method for producing a functional member according to the present invention will be described. The method for producing the functional member of the present invention is not particularly limited, and for example, any substrate 10 can be produced by applying a coating liquid for an easy-adhesion layer, which is obtained by dissolving or dispersing the material of the easy-adhesion layer 20 in an appropriate solvent, onto the substrate 10 by a known method, drying the coating liquid, and irradiating the coating liquid with ionizing radiation such as ultraviolet rays as necessary. Further, the easy-adhesion layer 20 may be prepared by applying a functional layer coating solution prepared by dissolving or dispersing the material of the functional layer 30 in an appropriate solvent by a known method, drying the coating solution, and irradiating the coating solution with ionizing radiation such as ultraviolet rays as necessary.

In the case of the back coating layer 40, a back coating layer coating solution dissolved or dispersed in an appropriate solvent is applied to the surface of the substrate 10 opposite to the functional layer 30 provided with the functional layer 30 by a known method, dried, and irradiated with ionizing radiation such as ultraviolet rays as necessary.

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

In this case, the order of application of the easy-adhesion layer 20, the functional layer 30, and the back coat layer 40 may be appropriately selected from the viewpoint of productivity and the like.

Further, if necessary, a functional layer may be further 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 functional member should have characteristics of initial adhesion and adhesion after being exposed for a long time in a severe environment such as high temperature and high humidity.

The adhesion was a cross-cut peel test specified in JIS K5400, and after the production of a functional member, the test was performed in 2 states of a state without any treatment (hereinafter referred to as "initial adhesion test") and a state after exposure for a certain period of time in an environment at a temperature of 85 ℃ and a humidity of 85% (humidification was performed with pure water) as a weather resistance test (hereinafter referred to as "post-high-temperature and high-humidity exposure adhesion test"), and it was satisfactory that one-fourth or more of the squares of 80 or more out of the squares 100 of the cross-cut of each test piece was not peeled.

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, the adhesive composition shows little change with time due to long-term exposure in a severe environment such as high temperature and high humidity, and maintains good adhesion.

Examples

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

[ example 1]

One surface of a polyethylene terephthalate film (lumirror t 60: dongli corporation) having a thickness of 100 μm was subjected to corona discharge treatment, and coating liquid a for an easy adhesion layer having the formulation shown in table 1 was applied to the surface-treated surface, followed by drying to form an easy adhesion layer having a thickness of 1.5 μm. Next, coating liquid a for a functional layer 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, thereby producing a functional member of example 1.

< preparation of aqueous Dispersion of polyester resin A >

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 put into a flask equipped with a nitrogen inlet tube, a thermometer, a stirrer and a distiller, and heated at 190 to 220 ℃ for 13 hours to perform an esterification reaction, thereby obtaining a polyester glycol. 100 parts of the obtained polyester diol, 100 parts of xylene and 35 parts of pyromellitic anhydride were put into a flask equipped with the same apparatus as described above, reacted at 140 ℃ for 1 hour, and then xylene was distilled off, and the temperature of the system was raised to 180 ℃ over 2 hours, and further kept at that temperature for 1 hour. As a result, a polyester resin A having a molecular weight of 18000 was obtained. The obtained polyester resin A25 parts was put into a mixed solution of 15 parts of isopropyl alcohol and 60 parts of ion-exchanged water, and stirred at 70 to 80 ℃ for 3 hours to obtain an aqueous polyester resin A dispersion having a solid content of 25%. The solid acid value of the aqueous dispersion of polyester resin A was 130 mgKOH/g.

< preparation of aqueous Dispersion of polyester resin B >

83 parts of terephthalic acid, 36 parts of isophthalic acid, 32 parts of ethylene glycol and 46 parts of neopentyl glycol were put into a flask equipped with a nitrogen inlet tube, a thermometer, a stirrer and a distiller, and heated at 260 ℃ for 4 hours to effect esterification reaction. Next, 0.1 part of antimony trioxide was added as a catalyst, the temperature of the system was raised to 280 ℃ and the pressure of the system was gradually reduced to 0.1mmHg after 1.5 hours. Under these conditions, polycondensation reaction was further conducted for 4 hours, resulting in a polyester resin B having a molecular weight of 18400. 25 parts of the obtained polyester resin B was put into a mixed solution of 15 parts of isopropyl alcohol and 60 parts of ion-exchanged water, and stirred at 70 to 80 ℃ for 3 hours to obtain an aqueous dispersion of polyester resin B having a solid content of 25%. The solid acid value of the aqueous dispersion of polyester resin B was 1.0 mgKOH/g.

< production of acrylic resin aqueous Dispersion >

In a beaker, 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, and 71 parts of methyl methacrylate and 29 parts of butyl acrylate were put while stirring to prepare a monomer emulsion. Then, 37.5 parts of ion-exchanged water, 1 part of ELEMINOL RS-3000(1 part) and 0.5 part of potassium persulfate were put into a flask equipped with a condenser, a funnel for dropping monomer, a thermometer and a stirrer, nitrogen substitution was carried out while stirring, heating was started, and the monomer emulsion was dropped at 75 ℃ for 4 hours. After the dripping is finished, stirring the mixture for 4 hours at the liquid temperature of 75-85 ℃, and then cooling the mixture. As a result, an acrylic resin having a molecular weight of 400000 was obtained. Further, ion-exchanged water was added thereto to obtain an acrylic resin aqueous dispersion having a solid content of 25%. The solid 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 in example 1, except that the corona discharge treatment of example 1 was not applied.

[ example 3]

A functional member of example 3 was produced in the same manner as in example 1, except that the coating liquid a for a functional layer in example 1 was changed to the coating liquid B for a functional layer described in table 2.

[ example 4]

A functional member of example 4 was produced in the same manner as in example 1, except that the coating liquid a for a functional layer in example 1 was changed to the coating liquid C for a functional layer described in table 2.

[ example 5]

A functional member of example 5 was produced in the same manner as in example 1, except that coating liquid a for an easy adhesion layer in example 1 was changed to coating liquid B for an easy adhesion layer shown in table 1, and coating liquid a for a functional layer was changed to coating liquid D for a functional layer shown in table 2.

[ example 6]

A functional member of example 6 was produced in the same manner as in example 1, except that coating liquid a for an easy adhesion layer in example 1 was changed to coating liquid C for an easy adhesion layer shown in table 1 and coating liquid a for a functional layer was changed to coating liquid D for a functional layer shown in table 2.

[ example 7]

A functional member of example 7 was produced in the same manner as in example 1, except that coating liquid a for an easy adhesion layer in example 1 was changed to coating liquid D for an easy adhesion layer shown in table 1 and coating liquid a for a functional layer was changed to coating liquid D for a functional layer shown in table 2.

[ example 8]

A functional member of example 8 was produced in the same manner as in example 1, except that coating liquid a for an easy adhesion layer in example 1 was changed to coating liquid E for an easy adhesion layer shown in table 1, and coating liquid a for a functional layer was changed to coating liquid D for a functional layer shown in table 2.

[ example 9]

A functional member of example 9 was produced in the same manner as in example 1, except that coating liquid a for an easy adhesion layer in example 1 was changed to coating liquid F for an easy adhesion layer shown in table 1 and coating liquid a for a functional layer was changed to coating liquid D for a functional layer shown in table 2.

[ example 10]

A functional member of example 10 was produced in the same manner as in example 1, except that coating liquid a for an easy adhesion layer in example 1 was changed to coating liquid G for an easy adhesion layer described in table 1, and coating liquid a for a functional layer was changed to coating liquid D for a functional layer described in table 2.

[ example 11]

A functional member of example 11 was produced in the same manner as in example 1, except that coating liquid a for an easy adhesion layer in example 1 was changed to coating liquid H for an easy adhesion layer shown in table 1 and coating liquid a for a functional layer was changed to coating liquid D for a functional layer shown in table 2.

Comparative example 1

A functional member of comparative example 1 was produced in the same manner as in example 1, except that the coating liquid a for a functional layer in example 1 was changed to the coating liquid E for a functional layer described 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 an easy adhesion layer in example 1 was changed to the coating liquid I for an easy adhesion layer 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 coating liquid a for a functional layer in example 1 was changed to the coating liquid F for a functional layer described 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 coating liquid a for a functional layer in example 1 was changed to the coating liquid G for a functional layer described 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 coating liquid a for an easy adhesion layer in example 1 was changed to coating liquid J for an easy adhesion layer shown in table 1.

TABLE 1

TABLE 2

Urethane acrylate, solid content concentration 80%, solid content acid value 0.9mgKOH/g

Epoxy acrylate, solid content concentration of 100%, solid content acid value of 35mgKOH/g

Photoinitiator, solid content 100%, solid content acid value 0.0mgKOH/g

The coating liquids for an easy adhesion layer, the coating liquids for a functional layer, and the functional members prepared in the examples and comparative examples were evaluated for the following characteristics.

< calculation of acid value of solid content >

The coating liquids for an easy-adhesion layer and the coating liquids for a functional layer of examples 1 to 11 and comparative examples 1 to 5 described above were prepared in accordance with JIS K2501: the acid value obtained by the indicator titration method specified in 2003 and the value calculated from the solid content concentration of each coating liquid are used as the solid content acid value. The calculation results are shown in Table 3.

< adhesion test >

1. Initial adhesion test

The functional layers of the functional members produced in the above examples and comparative examples were tested according to the peel test specified in JIS K5400, and evaluated according to the criteria shown below. In all the squares in the 100 squares, a state in which one-fourth or more peeling was not observed was evaluated as "excellent", in all the squares in the 100 squares, a state in which one-fourth or more peeling was not observed was evaluated as "o", and in all the squares in the 100 squares, a state in which one-fourth or more peeling was not observed was less than 80 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 members prepared in the above examples and comparative examples were exposed to an atmosphere having a temperature of 85 ℃ and a humidity of 85% (humidified to be carried out with pure water) for 500 hours. Then, the functional layer was tested according to the cross-cut peel test defined in JIS K5400 and evaluated according to the following criteria. In all the squares in the 100 squares, a state in which one-fourth or more peeling was not observed was evaluated as "excellent", in all the squares in the 100 squares, a state in which one-fourth or more peeling was not observed was evaluated as "o", and in all the squares in the 100 squares, a state in which one-fourth or more peeling was not observed was less than 80 squares was evaluated as "x". The measurement results are shown in table 3.

TABLE 3

From the results in table 3, it is understood that the functional members of examples 1 to 11 have good initial adhesion test and adhesion test after exposure to high temperature and high humidity, and excellent adhesion between the substrate and the easy-adhesion layer and adhesion between the easy-adhesion layer and the functional layer, because the solid acid value of the composition for forming the easy-adhesion layer on the substrate is 10.0mgKOH/g or more and the solid acid value of the composition for forming the functional layer is 4.0 to 12.0 mgKOH/g.

On the other hand, in comparative examples 2 and 5, the solid acid value of the composition for forming the easy-adhesion layer was less than 10.0mgKOH/g, and in comparative examples 1, 3, and 4, the solid acid value of the composition for forming the functional layer was less than 4.0mgKOH/g or more than 12.0mgKOH/g, so that the initial adhesion between the substrate and the easy-adhesion layer and/or the easy-adhesion layer and the functional layer and/or the adhesion after exposure to high temperature and high humidity were poor.

Description of the reference numerals

10. substrate, 20. easy-to-bond layer, 30. functional layer, 40. back coating

Claims

1. A functional member comprising a substrate and an easy-adhesion layer and a functional layer laminated on at least one surface of the substrate in this order, wherein the acid value of the solid content of a composition for forming the easy-adhesion layer is 10.0mgKOH/g or more, and the acid value of the solid content of a composition for forming the functional layer is 4.0 to 12.0 mgKOH/g.

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, characterized in that, in the polyester-acrylic composite resin, a constituent component of the acrylic resin accounts for much more than a constituent component of the polyester resin on a weight basis.

4. The functional member according to any one of claims 1 to 3, wherein a polar group is introduced into a surface of the base material on which the easy adhesion layer is laminated by surface treatment.

5. The functional member according to claim 4, wherein the polar group is any one or more groups selected from a hydroxyl group, a carboxyl group and a sulfonic acid group.