JP2002348150A - Self-adhesive sheet for intermediate film and transparent laminated body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-adhesive sheet for intermediate film with which a transparent laminated body can be made at room temperature without requiring high temperature high pressure treatment with an autoclave. SOLUTION: The self-adhesive sheet 1 for intermediate film is constituted of an self-adhesive layer 2 and release films 3 attached to both the front and back surfaces thereof. The self-adhesive layer 2 is formed so as to be able to be cured with ultraviolet light, and has viscoelasticities shown in (a), (b) in the condition before being cured with ultraviolet light and (c), (d) in the condition after being cured with ultraviolet light. (a) The storage elasticity G' (1 Hz) is 5×10<3> to 5×10<5> Pa at a measuring temperature of 20 deg.C and frequency of 1 Hz. (b) The storage elasticity G' (10<-7> Hz) is 5×10<1> to 5×10<3> Pa at standard temperature of 20 deg.C and frequency of 10<-7> Hz. (c) The storage elasticity G' (1 Hz) is 1×10<4> to 1×10<6> Pa at a measuring temperature of 20 deg.C and frequency of 1 Hz. (d) The storage elasticity G' (10<-7> Hz) is 1×10<4> Pa or more at standard temperature of 20 deg.C and frequency of 10<-7> Hz. A glass panel 4 and a synthetic resin panel 5 is laminated via the self-adhesive layer 2 to form a laminated glass 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent laminated body used for windows such as automobiles, railway cars, ships, aircraft, buildings, and machinery, or for display displays such as liquid crystal displays, plasma displays, touch panels, etc., using an autoclave. The present invention relates to a pressure-sensitive adhesive sheet for an intermediate film which can be produced at room temperature without requiring high-temperature and high-pressure treatment, and a transparent laminate using the sheet.

[0002]

2. Description of the Related Art It is common to use glass sheets as windows for vehicles, ships, and buildings. Improved impact resistance of these window glasses. In order to prevent penetration of colliding objects, polyvinyl butyral (PV
A laminated laminated glass sandwiching a film made of B) or the like is generally used. However, since such a laminated glass is heavy, it is difficult for the laminated glass to penetrate in the event of an impact, but cracks or the like may occur on the glass plate.

[0003] Therefore, a synthetic resin plate / glass plate combined structure that reduces damage by using a synthetic resin plate typified by a polycarbonate (PC) plate as a hard-to-break material has been proposed.

As a method of obtaining a laminate of a synthetic resin plate / glass plate, a thermoplastic resin such as a PVB film, an ethylene-vinyl acetate copolymer (EVA) film, or a urethane film is sandwiched between the synthetic resin plate and the glass plate. It is common to use an autoclave under high temperature and high pressure conditions.

[0005]

However, the use of a thermoplastic resin generally requires heating at a temperature of 80 ° C. or higher.
When the laminate after the thermocompression bonding returns to room temperature, there is a problem that warpage or cracks occur.

On the other hand, a method of injecting an ultraviolet-curable liquid resin between transparent plates and then curing the resin with ultraviolet (Japanese Patent Laid-Open No. 7-129)
No. 0647) has been proposed, but the method using a liquid resin has a problem that the resin injection method and the film thickness control are not easy.

The present invention has been made in view of the above-mentioned conventional problems, and a first object of the present invention is to provide an intermediate which can produce a laminate at room temperature without requiring high-temperature and high-pressure treatment by an autoclave. An object of the present invention is to provide a pressure-sensitive adhesive sheet for a membrane. A second object is to provide a transparent laminate using the pressure-sensitive adhesive sheet for an intermediate film.

[0008]

In order to achieve the first object, the pressure-sensitive adhesive sheet for an intermediate film according to the first aspect of the present invention has at least one UV-curable pressure-sensitive adhesive layer. In the present invention, the pressure-sensitive adhesive sheet for an intermediate film is used for processing of a plate material at room temperature in a state before ultraviolet curing,
Thereafter, the pressure-sensitive adhesive layer is cured by ultraviolet irradiation. Therefore, a laminate can be formed without requiring high-temperature and high-pressure treatment by an autoclave, and practical durability can be ensured.

According to a second aspect of the present invention, in the first aspect of the invention, the ultraviolet-curable pressure-sensitive adhesive layer has the following viscoelastic properties before curing (a) and (b). (A) The storage elastic modulus G ′ (1 Hz) at a measurement temperature of 20 ° C. and a frequency of 1 Hz is 5 × 10 ^{3 to} 5 × 10 ⁵ Pa (Pascal). (B) Storage elastic modulus G ′ (10 ⁻⁷ Hz) at a reference temperature of 20 ° C. and a frequency of 10 ⁻⁷ Hz is 5 × 10 ^{1 to} 5 × 10 ^3.
Pa.

The viscoelastic properties were measured under the following conditions using a dynamic analyzer RDAII, a viscoelasticity measuring device manufactured by Rheometrics.・ Temperature: 20 to 150 ° C. ・ Angular frequency: ω = 0.005 to 500 rad / sec ・ Parallel plate: 25 mmφ ・ Amount of strain: 3% Create a master curve converted from temperature to time using RADII at 20 ° C. as a reference temperature. , (A) and (b) were calculated from f (Hz) = ω / (2π), and the storage elastic modulus G ′ was read.

In the present invention, the dimensional stability of the sheet shape is ensured because the pressure-sensitive adhesive layer before the ultraviolet curing has the above-mentioned predetermined viscoelastic properties. In addition, the flow (wetting) of the pressure-sensitive adhesive layer filling the unevenness of the interface with the plate material proceeds while being sandwiched between the two plate materials to be laminated, and a laminated appearance without bubbles can be obtained.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the ultraviolet-curable pressure-sensitive adhesive layer has the following viscosity (c) and (d) in a cured state. Has elastic properties. (C) Measurement temperature 20 ° C, frequency 1H
The storage elastic modulus G ′ (1 Hz) at z is 1 × 10 ⁴ to 1 × 1
0 ⁶ Pa (Pascal). (D) Storage elastic modulus G ′ (10 ⁻⁷ Hz) at a reference temperature of 20 ° C. and a frequency of 10 ⁻⁷ Hz is 1 × 1
0 ⁴ Pa or more.

According to the present invention, since the pressure-sensitive adhesive sheet cured by ultraviolet light has the above-mentioned predetermined viscoelastic properties, practical durability can be imparted. In the invention according to claim 4, in the invention according to any one of claims 1 to 3, the pressure-sensitive adhesive layer contains a (meth) acrylic acid ester containing an α, β unsaturated carboxylic acid. An organic functional group-containing (meth) acrylate monomer, which is mainly composed of a polymer and reacts with the unsaturated carboxylic acid, a photopolymerization initiator and a metal compound are added.

According to the present invention, the predetermined viscoelastic property before the ultraviolet curing can be imparted to the pressure-sensitive adhesive layer relatively easily by using the metal ion crosslinking by the metal compound. Further, ultraviolet curability can be imparted by grafting an acrylic monomer.

According to a fifth aspect of the present invention, there is provided a transparent laminate using the pressure-sensitive adhesive sheet for an intermediate film according to any one of the first to fourth aspects of the invention, wherein the glass sheets are made of glass sheets and a synthetic resin. After laminating at least two plates or synthetic resin plates,
The pressure-sensitive adhesive layer is cured by ultraviolet rays.

In the present invention, the transparent laminate is described in claims 1 to
After laminating at least two glass plates, a glass plate and a synthetic resin plate or two synthetic resin plates using the pressure-sensitive adhesive sheet for an intermediate film according to any one of claims 4, the pressure-sensitive adhesive layer is cured by ultraviolet light. It is formed by doing. Therefore, high temperature
Since high pressure treatment is not required, it can be formed without using an autoclave.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will be described below with reference to FIGS. As shown in FIG. 1A, the pressure-sensitive adhesive sheet 1 for an intermediate film includes a pressure-sensitive adhesive layer 2 and release films 3 attached to both front and back surfaces thereof. The pressure-sensitive adhesive layer 2 is configured to be capable of being cured by ultraviolet light, and has a viscoelastic property of the following (a) and (b) before being cured by ultraviolet light. (A) Storage elastic modulus G ′ (1 Hz) at a measurement temperature of 20 ° C. and a frequency of 1 Hz
Is 5 × 10 ^{3 to} 5 × 10 ⁵ Pa. (B) Reference temperature 20
° C, storage elastic modulus G '(10 ^-7 Hz) at a frequency of 10 ^-7 Hz
Is 5 × 10 ^{1 to} 5 × 10 ³ Pa. Further, it is configured to have the following viscoelastic properties (c) and (d) in a state after ultraviolet curing. (C) Storage elastic modulus G ′ (1 Hz) at a measurement temperature of 20 ° C. and a frequency of 1 Hz is 1 × 10 ⁴ to 1 ×
10 ⁶ Pa. (D) Reference temperature 20 ° C., frequency 10 ⁻⁷ Hz
Elastic modulus G ′ (10 ⁻⁷ Hz) at 1 × 10 ⁴ Pa or more.

The viscoelastic properties were measured under the above conditions using a dynamic analyzer RDAII, a viscoelasticity measuring device manufactured by Rheometrics. The composition of the pressure-sensitive adhesive layer 2 is an acrylic pressure-sensitive adhesive, and is mainly composed of a (meth) acrylate copolymer containing an α, β unsaturated carboxylic acid. An organic functional group-containing (meth) acrylate monomer that reacts with the unsaturated carboxylic acid, a photopolymerization initiator, and a metal compound are added to the main component, and a (meth) acryloyl group is added to the (meth) acrylate-based copolymer. At the same time as grafting, the main component is cross-linked with metal ions,
The pressure-sensitive adhesive sheet 1 for an intermediate film, which can be laminated at room temperature and curable by ultraviolet rays, is obtained.

By using metal ion crosslinking, it is possible to relatively easily impart a predetermined viscoelastic property before the ultraviolet curing, and it is possible to impart ultraviolet curing properties by grafting an acrylic monomer.

The organic functional group-containing (meth) acrylate monomer includes a glycidyl group-containing (meth) acrylate monomer, a hydroxy group-containing (meth) acrylate monomer, and an isocyanate group-containing (meth) acrylate monomer. What is necessary is just to have the functional group shown below.

As the photopolymerization initiator, it is preferable to select a photopolymerization initiator having little coloring property and odor. As the metal compound, an acetylacetone metal complex having a zinc ion, a sodium ion, or the like, a metal oxide, a fatty acid metal salt, or the like is used.

Next, a method for producing a laminated glass using the pressure-sensitive adhesive sheet 1 for an intermediate film configured as described above will be described. Although there are various methods for laminating the laminated glass, the following method that can laminate without using an autoclave is preferable. Laminated glass may be a stack of glass plates or a laminate of a glass plate and a synthetic resin plate or a synthetic resin plate. FIG. 2 illustrates a case of laminating a glass plate and a synthetic resin plate.

As shown in FIG. 2A, first, the adhesive sheet 1 for an intermediate film, from which the release film 3 on one side has been peeled off, before curing with an ultraviolet ray, is brought into contact with the glass plate 4 for the first time between the nip roll 6 and the driving rubber roll 7. Thus, the pressure-sensitive adhesive layer 2 is carried between the two rolls 6 and 7 and the pressure-sensitive adhesive layer 2 is attached to the surface of the glass plate 4. Next, the remaining release film 3 is peeled off, and as shown in FIG. 2B, the glass plate 4 to which the pressure-sensitive adhesive layer 2 is adhered faces the synthetic resin plate 5 via the pressure-sensitive adhesive layer 2 without coming into contact therewith. Match. Then, the end portions of the glass plate 4 and the synthetic resin plate 5 are carried between the two rolls 6 and 7 so as to be brought into contact between the two rolls 6 and 7 for the first time. By laminating the synthetic resin plate 5 and FIG.
The laminated glass 8 shown in (b) is formed.

Next, the laminated glass 8 as a transparent laminated plate laminated as described above is irradiated with ultraviolet rays using an ultraviolet irradiation device such as a mercury lamp or a metal halide lamp.
The pressure-sensitive adhesive layer 2 is cured. As a result, the laminated glass 8 is completed with the viscoelastic properties of the pressure-sensitive adhesive layer 2 falling within the ranges (c) and (d).

A conventional transparent laminate such as a laminated glass is of a hot melt type in which an intermediate film is heated and melted to fill irregularities between two glass plates, whereas an intermediate film (adhesive film) of the present invention is used. The agent layer 2) uses a pressure-sensitive adhesive having viscoelastic properties that can be bonded at room temperature. In order to be able to laminate a plate material such as a glass plate at room temperature, it is necessary to relax the pressure-sensitive adhesive layer 2 so that the unevenness of the thickness between the plate materials is adapted during lamination. Then, before the pressure-sensitive adhesive layer 2 is cured by ultraviolet rays,
By having the viscoelastic property of (b), during the laminating process of the plate materials, it becomes accustomed to the unevenness of the thickness between the plate materials, is relaxed, and a laminated appearance without bubbles can be obtained. In other words, the pressure-sensitive adhesive layer 2 is designed to be both soft enough to fit into the thickness irregularities and hard enough to maintain dimensional stability.

The storage elastic modulus G ′ (10 ⁻⁷ H) of the pressure-sensitive adhesive layer 2
When z) is less than 5 × 10 ¹ Pa, there is a problem that the creep property is poor and the sheet shape is poor in long-term dimensional stability. If the storage elastic modulus G ′ (10 ⁻⁷ Hz) exceeds 5 × 10 ³ Pa, there is a problem that, during laminating, it is too hard to relax and bubbles are generated in the recess due to a slight thickness unevenness between the plates. is there.

Further, the storage elastic modulus G 'at a frequency of 1 Hz
(1 Hz) in the range of 5 × 10 ^{3 to} 5 × 10 ⁵ Pa is also important in normal-temperature lamination. That is, when the storage elastic modulus G ′ (1 Hz) is 5 × 10 ³ Pa or less, the sheet itself or the handling at the time of laminating is not easy because the adhesiveness is very high. Storage modulus G '(1H
When z) is 5 × 10 ⁵ Pa or more, on the contrary, the tackiness becomes poor, and there is a problem that a sufficient adhesive strength to the plate material cannot be secured.

If the pressure-sensitive adhesive layer 2 is in the state of the viscoelastic properties before the ultraviolet curing, the cohesive force is not sufficient, and the pressure-sensitive adhesive layer 2 is laminated under a practical use environment (high-temperature / humidity, low-temperature to high-temperature cycle, etc.). There is a problem that the body plate is displaced or bubbles are generated in the lamination plane. However, after laminating the plate material at room temperature, the pressure-sensitive adhesive layer 2 is cured by ultraviolet rays so that the viscoelastic properties satisfy the conditions (c) and (d), so that it can withstand a practical use environment. Can provide a cohesive force.
As a result, the laminated glass 8 as a transparent laminate can ensure durability in a practical use environment.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. (Example 1) An adhesive sheet for an intermediate film contains an organic functional group-containing (meth) based on 100 parts by weight of an acrylate copolymer.
2-isocyanatoethyl methacrylate: 2.0 parts by weight as an acrylate monomer, 1 as a photopolymerization initiator
-Hydroxy-cyclohexyl-phenyl ketone: 2.
0 parts by weight, zinc salt of acetylacetone as a metal compound:
After melt-stirring 2.0 parts by weight, the resultant was molded into a sheet having a thickness of 0.5 mm between the release films to obtain an intermediate film adhesive sheet.

Using the above-mentioned sheet, a transparent laminate was produced by the following method. The production method is such that an intermediate film obtained by peeling a release film on one side from one side of a commercially available float glass plate (thickness 3 mm, width 200 mm, length 300 mm) is brought into contact between a nip roll and a driving rubber roll for the first time. Carried between the rolls, linear pressure: 9.8 N / cm, speed:
After sticking at 5 m / min, the remaining template film was peeled off.

Next, a glass plate on which the above-mentioned intermediate film was adhered was placed on a commercially available polycarbonate plate (thickness: 2 mm, width: 2 mm) through the intermediate film.
Nip rolls (line pressure: 196 N / cm, speed: 0.1 mm) so that the ends of the two plates contact each other for the first time between the nip roll and the drive roll. (5 m / min), and the laminate was irradiated from the glass side of the laminate at 160 w / cm at 5 m / min using an ultraviolet irradiation device of a high pressure mercury lamp to obtain a transparent laminate.

The composition of the acrylate copolymer used in the pressure-sensitive adhesive sheet for the intermediate film was n-butyl acrylate: 7
8.4% by weight, 2-ethylhexyl acrylate: 1
9.6% by weight and acrylic acid: 2.0% by weight were copolymerized. The molecular weight and molecular weight distribution of the acrylate copolymer measured by GPC were determined by the weight average molecular weight (M
W): 2.27 × 10 ⁶ , weight average molecular weight (MW) / number average molecular weight (MN): 3.6.

Example 2 The pressure-sensitive adhesive sheet for an intermediate film contained 5.0 parts by weight of 2-isocyanatoethyl methacrylate as a (meth) acrylate monomer having an organic functional group, based on 100 parts by weight of an acrylate ester copolymer. After melt-stirring 2.0 parts by weight of 1-hydroxy-cyclohexyl-phenyl ketone as a polymerization initiator and 2.0 parts by weight of zinc acetylacetone salt as a metal compound, a sheet having a thickness of 0.5 mm is formed between the release films. It was molded to obtain an interlayer adhesive sheet.

A transparent laminate was obtained by the method prepared in Example 1 using the thus obtained pressure-sensitive adhesive sheet for an intermediate film. (Comparative Example 1) Using the same pressure-sensitive adhesive sheet for an intermediate film as in Example 1, the laminate was laminated under the same conditions as in Example 1, and then a transparent laminate was obtained without UV curing.

(Comparative Example 2) The pressure-sensitive adhesive sheet for an intermediate film was composed of 10.0 parts by weight of 2-isocyanatoethyl methacrylate as a (meth) acrylate monomer having an organic functional group, based on 100 parts by weight of an acrylate copolymer. After melt-stirring 2.0 parts by weight of 1-hydroxy-cyclohexyl-phenyl ketone as a polymerization initiator and 2.0 parts by weight of zinc acetylacetone salt as a metal compound, a sheet having a thickness of 0.5 mm is formed between the release films. It was molded to obtain an adhesive sheet for an intermediate film.

Using the adhesive sheet for an intermediate film thus obtained, a transparent laminate was obtained in the same manner as in Example 1. Table 1 shows the results of the evaluation of the following items using the laminated glasses obtained in the above Examples and Comparative Examples. Those with no problem are indicated by (○).

[Moisture and Heat Resistance Test] 1 at 60 ° C. × 90% RH
After holding for 4 days, the presence or absence of bubbles and peeling was observed.

[Heat cycle test] After holding at -20 ° C for 2 hours, holding at 80 ° C for 2 hours, raising and lowering the temperature by 1 each.
After repeating the time-consuming heat cycle four times a day for 14 days, the presence or absence of occurrence of bubbles and peeling was observed.

[0039]

[Table 1] As is clear from the results in Table 1, when the pressure-sensitive adhesive sheet for an intermediate film of the present invention is used, a laminate that can be laminated at room temperature and is satisfactory in appearance can be obtained. It can be seen that a sheet (comparative example) outside the range of storage modulus measured at the frequency of the present invention cannot satisfy any of the observation items.

This embodiment has the following effects. (1) The pressure-sensitive adhesive sheet 1 for an intermediate film has at least one pressure-sensitive adhesive layer 2 which can be cured with ultraviolet light, and is used at room temperature in a state before curing with ultraviolet light at room temperature. Is cured. Therefore, a laminate can be formed without requiring high-temperature and high-pressure treatment by an autoclave, and practical durability can be ensured. As a result, it can be suitably used for applications that dislike heating.

(2) Since the storage elastic modulus (the storage elastic modulus G ′ (10 ⁻⁷ Hz) at a frequency of 10 ⁻⁷ Hz) of the pressure-sensitive adhesive layer 2 before curing with ultraviolet light in a long time range is within a specific range, The pressure-sensitive adhesive layer 2 adapts to the unevenness of the thickness at the time of the joining process of the plate material and is relaxed, so that a joined appearance without bubbles can be obtained.

(3) Since the storage elastic modulus of the pressure-sensitive adhesive layer 2 after ultraviolet curing in a long time range is within a specific range, practical durability can be imparted. (4) The pressure-sensitive adhesive layer 2 is mainly composed of a (meth) acrylate copolymer containing an α, β unsaturated carboxylic acid, and contains an organic functional group-containing (meth) acrylate monomer that reacts with the unsaturated carboxylic acid. , A photopolymerization initiator and a metal compound. Therefore, by using metal ion crosslinking by a metal compound, it is possible to relatively easily impart a predetermined viscoelastic property to the pressure-sensitive adhesive layer 2 in a state before the ultraviolet curing. Further, ultraviolet curability can be imparted by grafting an acrylic monomer.

(5) Since the pressure-sensitive adhesive layer 2 is an acrylic pressure-sensitive adhesive, weather resistance and transparency are improved. (6) Since the pressure-sensitive adhesive layer 2 has a structure in which the release film 3 is bonded to both the front and back adhesive surfaces, it can be first bonded to one of the plate materials with good workability in a state where one of the release films 3 is peeled off, and then to the other. The release film 3 can be peeled off and attached to the other of the plate members with good workability. Further, it is easier to form the adhesive layer to a predetermined thickness as compared with the case where the adhesive is directly applied to the plate material to form the adhesive layer.

The embodiment is not limited to the above, and may be embodied as follows, for example. The pressure-sensitive adhesive sheet 1 for an intermediate film is not limited to a single pressure-sensitive adhesive layer 2 and may have, for example, a structure in which a pressure-sensitive adhesive layer 2 is formed on both surfaces of a core material formed of a film, a sheet, or a woven fabric. In this case, when a highly rigid biaxially stretched polyethylene terephthalate film or the like is used as the core material, the handling property (workability) of the pressure-sensitive adhesive sheet 1 for an intermediate film is particularly improved.

When laminating glass plates, or between a glass plate and a synthetic resin plate or between synthetic resin plates, the number of plate materials to be laminated is 2
The number is not limited to three, and may be three or more. The release film 3 that holds the pressure-sensitive adhesive layer 2 is formed of a material that suppresses transmission of ultraviolet rays. In this case, there is no fear that the pressure-sensitive adhesive layer 2 will be cured before using the pressure-sensitive adhesive sheet 1 for an intermediate film, that is, before the release film 3 is peeled off.

A crosslinking agent other than a metal compound may be used as a crosslinking agent contained in the pressure-sensitive adhesive layer 2. As shown in FIGS. 3 (a) and 3 (b), on one or both sides of the UV-curable pressure-sensitive adhesive layer 2, a pressure-sensitive adhesive that is not UV-curable, for example, an acrylic resin is an isocyanate type, an epoxy type, A relatively hard pressure-sensitive adhesive layer 21 that has already been cured with a melamine-based curing agent or ultraviolet light may be laminated.

As a result, the unevenness of the thickness is propagated to the pressure-sensitive adhesive layer 2 before being cured by the ultraviolet rays through the relatively hard pressure-sensitive adhesive layer 21 at the time of joining the plate materials, and the pressure-sensitive adhesive layer 2 is relaxed. Familiarized with the adhesive sheet for interlayer 1 as a whole,
An air-free appearance can be obtained.

The technical ideas (inventions) that can be grasped from the above embodiment will be described below. (1) In the invention according to any one of claims 1 to 4, the pressure-sensitive adhesive layer is formed on both surfaces of a film-shaped core material. In this case, the handleability (workability) of the pressure-sensitive adhesive sheet for an intermediate film is improved.

(2) In the invention according to any one of claims 1 to 4, the pressure-sensitive adhesive layer is sandwiched between two release films, and the release film suppresses transmission of ultraviolet rays. Is formed.

[0050]

As described in detail above, claims 1 to 5 are provided.
According to the invention described in (1), a laminate can be manufactured at room temperature without requiring high-temperature and high-pressure treatment by an autoclave.

[Brief description of the drawings]

FIG. 1A is a schematic sectional view of an adhesive sheet for an intermediate film,
(B) is a schematic sectional view of a laminated glass.

FIG. 2 is a schematic process diagram illustrating an example of a method for manufacturing a laminated glass.

FIG. 3 is a schematic cross-sectional view of an adhesive sheet for an intermediate film according to another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Adhesive sheet for intermediate films, 2 ... Adhesive layer, 3 ... Release film, 4 ... Glass plate, 5 ... Synthetic resin plate, 8 ... Laminated glass as a transparent laminated body.

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) C09J 151/00 C09J 151/00 F term (reference) 4F100 AG00A AG00C AK01A AK01C AK25B AK45 BA03E BA06 BA07 BA10A BA10C CA30B EJ19 EJ52 JB14B JL13B JN01 4G061 AA02 AA04 BA02 BA03 CA02 CB03 CB16 CD02 CD12 CD18 DA23 DA36 DA46 4J004 AA10 AA17 AA18 AB07 BA02 BA03 DB02 FA08 4J040 DF031 DL121 FA141 GA05 GA11 GA20 HA076 HD41 HD43 JA09 JB08 KA13 LA06 MA05 PA32

Claims (5)

[Claims] 1. A pressure-sensitive adhesive sheet for an intermediate film, comprising at least one UV-curable pressure-sensitive adhesive layer. 2. The pressure-sensitive adhesive sheet for an intermediate film according to claim 1, wherein the ultraviolet-curable pressure-sensitive adhesive layer has the following viscoelastic properties before curing (a) and (b). (A) Storage elastic modulus G ′ (1 Hz) at a measurement temperature of 20 ° C. and a frequency of 1 Hz is 5 × 10 ^{3 to} 5 × 10 ⁵ Pa (Pascal). (B) The storage elastic modulus G ′ (10 ⁻⁷ Hz) at a reference temperature of 20 ° C. and a frequency of 10 ⁻⁷ Hz is 5 × 10 ^{1 to} 5 × 10 ³ P
a. 3. The pressure-sensitive adhesive sheet for an intermediate film according to claim 1, wherein the UV-curable pressure-sensitive adhesive layer has the following viscoelastic properties in the cured state. (C) The storage elastic modulus G ′ (1 Hz) at a measurement temperature of 20 ° C. and a frequency of 1 Hz is 1 × 10 ⁴ to 1 × 10 ⁶ Pa (Pascal). (D) Storage elastic modulus G ′ (10 ⁻⁷ Hz) at a reference temperature of 20 ° C. and a frequency of 10 ⁻⁷ Hz is 1 × 10 ⁴ Pa or more. 4. The pressure-sensitive adhesive layer contains a (meth) acrylate copolymer containing an α, β unsaturated carboxylic acid as a main component and contains an organic functional group (meth) that reacts with the unsaturated carboxylic acid. The pressure-sensitive adhesive sheet for an interlayer according to any one of claims 1 to 3, further comprising an acrylate monomer, a photopolymerization initiator, and a metal compound. 5. After laminating at least two glass plates, or between a glass plate and a synthetic resin plate or between synthetic resin plates, using the pressure-sensitive adhesive sheet for an intermediate film according to any one of claims 1 to 4. And a transparent laminate obtained by curing the pressure-sensitive adhesive layer with ultraviolet rays.