CN113861854B - Adhesive film for image display device and image display device - Google Patents
Adhesive film for image display device and image display device Download PDFInfo
- Publication number
- CN113861854B CN113861854B CN202111127894.7A CN202111127894A CN113861854B CN 113861854 B CN113861854 B CN 113861854B CN 202111127894 A CN202111127894 A CN 202111127894A CN 113861854 B CN113861854 B CN 113861854B
- Authority
- CN
- China
- Prior art keywords
- acrylate
- adhesive film
- image display
- meth
- display device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
- C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/10—Adhesives in the form of films or foils without carriers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/35—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being liquid crystals
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
Abstract
The invention discloses an adhesive film for an image display device and the image display device, the glass transition temperature of the adhesive film is-23-0 ℃, and the tan delta at 25-100 ℃ is 0.42-0.84, the glass transition temperature is the temperature at which the tan delta shows the peak value within-40-80 ℃, the tan delta is the value obtained by dividing the loss modulus by the storage modulus, and the adhesive film comprises the following components: 1) An acrylic derivative polymer comprising the following raw materials: C4-C18 acrylate monomer, hydrophilic monomer and alkaline monomer; 2) The photoinitiator comprises a hydrogen abstraction type ultraviolet photoinitiator and a cracking type ultraviolet photoinitiator. The adhesive film has good filling property and storage stability, good reliability after ultraviolet post-curing, and can inhibit high temperature and high humidity (85) o C/85% RH), air bubbles, floating, peeling, etc.
Description
Technical Field
The invention relates to an adhesive film for an image display device and an image display device.
Background
As an example of a typical image display device (fig. 1), a Liquid Crystal Display (LCD) or LED display device is exemplified, and as can be seen from fig. 1, in order to obtain a good display effect, the adhesive film should have a good filling capability to fill the ink level difference without generating bubbles. Meanwhile, the adhesive film should not overflow during long-term storage, thereby causing defects. Further, when the display device is used for a vehicle, an outdoor measuring instrument, a mobile phone, a personal computer, or the like, the use environment in which the adhesive film is adhered becomes very severe, and the adhesive force of the adhesive film is reduced when the members are bonded, and bubbles, peeling, or the like are likely to occur. Therefore, there is an increasing demand for highly durable pressure-sensitive adhesive sheets that do not generate bubbles, peeling, and the like in the application environment.
In response to this requirement, JP20040279833, JP20070284292, CN103403119B and CN104254583B exemplify adhesive material compositions which are exposed to high temperature and high humidity for a long time, and in which foaming, lifting, peeling, and the like do not occur at the bonding interface, but the resulting adhesive film is difficult to achieve both good filling properties and storage stability.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an adhesive film for an image display device, which has good filling property and storage stability.
In order to achieve the purpose, the invention adopts the technical scheme that: an adhesive film for an image display device, the adhesive film having a glass transition temperature of-23 to 0 ℃ and a tan δ of 0.42 to 0.84 at 25 to 100 ℃, the glass transition temperature being a temperature at which tan δ shows a peak within-40 to 80 ℃, the tan δ being a value obtained by dividing a loss modulus by a storage modulus, the adhesive film comprising the following components:
1) An acrylic derivative polymer comprising the following raw materials: C4-C18 acrylate monomer, hydrophilic monomer and alkaline monomer;
2) A photoinitiator which comprises a hydrogen abstraction type ultraviolet initiator and a cracking type ultraviolet initiator,
wherein the adding amount of the alkaline monomer is 0.5-15% of the mass of the acrylic derivative polymer raw material.
Here, the adhesive film is obtained by polymerizing an acrylic derivative polymer and a photoinitiator, and the polymerization method includes, but is not limited to, uv curing without solvent, thermal curing, and thermal polymerization with solvent.
In the ultraviolet curing process, the light source can be, but is not limited to, LED lamp, low-pressure mercury lamp, medium-pressure mercury lamp, high-pressure mercury lamp, etc., and the ultraviolet irradiation device is used for irradiating ultraviolet rays with intensity of 0.65-1mW/cm 2 。
Preferably, the acrylic derivative polymer comprises the following raw materials in percentage by mass: 75-89.5% of C4-C18 acrylate monomer, 10% of hydrophilic monomer and the balance of alkaline monomer.
As a specific embodiment, the C4-C18 acrylate monomer includes, but is not limited to, one or more of butyl (meth) acrylate, isooctyl (meth) acrylate, isobornyl (meth) acrylate, isobutyl (meth) acrylate, tert-butyl (meth) acrylate, cyclohexyl (meth) acrylate, n-octyl (meth) acrylate, dodecyl (meth) acrylate, stearyl (meth) acrylate, and isostearyl (meth) acrylate, and the C4-C18 acrylate monomer is added in an amount of 50-95% by mass of the raw material of the acrylic derivative polymer.
As a specific embodiment, the hydrophilic monomer includes but is not limited to one or more of hydroxyethyl acrylate, 2-hydroxypropyl acrylate and 4-hydroxybutyl acrylate, and the amount of the hydrophilic monomer added is 5-30%, preferably 10% of the mass of the acrylic derivative polymer raw material.
As a specific embodiment, the basic monomer includes but is not limited to one or more of (meth) acrylamide, (meth) acryloyl morpholine, N-dimethylacrylamide, and the addition amount of the basic monomer is 0.5-15% of the mass of the acrylic derivative polymer raw material.
As a specific embodiment, the hydrogen abstraction type ultraviolet light initiator includes but is not limited to one or more of 4-methyl benzophenone, 4-acrylyl oxybenzoic acid benzophenone, and the amount of the hydrogen abstraction type ultraviolet light initiator is 0.1-1% of the amount of the acrylic derivative polymer.
As a specific embodiment, the cleavage type uv initiator includes, but is not limited to, one or more of benzoin derivatives, benzil ketal derivatives, dialkoxyacetophenones, α -hydroxyalkylphenylketones, α -aminoalkylphenones, acylphosphine hydrides, esterified oxime ketone compounds, aryl peroxy ester compounds, halogenated methyl aryl ketones, organic sulfur-containing compounds, and benzoyl formate, and is used in an amount of 0.1 to 2%, preferably 0.5%, based on the mass of the acrylic derivative polymer.
As a specific embodiment, the adhesive film comprises the following components:
1) The acrylic acid derivative polymer comprises the following raw materials in percentage by mass: 75-89.5% of C4-C18 acrylate monomer, 10% of hydrophilic monomer and the balance of alkaline monomer;
2) The photoinitiator adopts a hydrogen abstraction type ultraviolet initiator and a cracking type ultraviolet initiator, wherein the cracking type ultraviolet initiator adopts benzil dimethyl ether, the hydrogen abstraction type ultraviolet initiator adopts 4-acrylyl oxybenzoic acid benzophenone or 4-methyl benzophenone, and the adding amount of the hydrogen abstraction type ultraviolet initiator is 0.1-1% of the mass of the acrylic derivative polymer;
and the glass transition temperature of the adhesive film is-23 to 0 ℃, and the tan delta at 25 to 100 ℃ is 0.42 to 0.84, the glass transition temperature is the temperature at which the tan delta shows a peak value in-40 to 80 ℃, and the tan delta is the value obtained by dividing the loss modulus by the storage modulus. Here, the amount of the cleavage type UV initiator added is preferably 0.5% of the mass of the acrylic derivative polymer.
A second object of the present invention is to provide an image display device having a layer on the visible side to which the image display device is adhered with an adhesive film.
A third object of the present invention is to provide an image display device having the adhesive film for an image display device between a transparent protective plate and a touch panel or between a transparent protective plate and an image display unit.
There is also provided a method of manufacturing an image display device, comprising: the adhesive sheet for an image display device is used to bond the transparent protective plate to the touch panel, the touch panel to the image display unit, or the transparent protective plate to the image display unit.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the adhesive film for image display device of the present invention is polymerized by acrylic derivative polymer and photoinitiator, has a glass transition temperature of-23-0 ℃, and a tan delta of 0.42-0.84 at 25-100 ℃, so that the adhesive film has good filling property and storage stability, and after ultraviolet post-curing, the adhesive film has good reliability, and can inhibit bubbles, floating, peeling and the like under high temperature and high humidity (85 ℃/85%.
Drawings
Fig. 1 is a schematic diagram showing a cross-sectional structure of an example of a conventional image display device;
wherein: 1. a transparent protective plate (glass or plastic substrate); 2. the adhesive layer is used for attaching the transparent protective plate and the display module; 3. a display module (LCD module or LED module).
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
An adhesive film for an image display device, the adhesive film comprising the following components:
1) An acrylic derivative polymer comprising the following raw materials: C4-C18 acrylate monomer, hydrophilic monomer and alkaline monomer;
2) A photoinitiator, which comprises a hydrogen abstraction type ultraviolet initiator and a cracking type ultraviolet initiator,
wherein the adding amount of the alkaline monomer is 0.5-15% of the mass of the acrylic derivative polymer raw material,
the adhesive film has a glass transition temperature of-23 to 0 ℃ and a tan delta of 0.42 to 0.84 at 25 to 100 ℃, the glass transition temperature is a temperature at which tan delta shows a peak value within-40 to 80 ℃, and the tan delta is a value obtained by dividing a loss modulus by a storage modulus.
Specifically, the C4-C18 acrylate monomer includes, but is not limited to, one or more of butyl (meth) acrylate, isooctyl (meth) acrylate, isobornyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, cyclohexyl (meth) acrylate, n-octyl (meth) acrylate, dodecyl (meth) acrylate, octadecyl (meth) acrylate, and isooctyl (meth) acrylate, and the amount of the added monomer is 50-95% of the mass of the raw material of the acrylic derivative polymer.
The hydrophilic monomer comprises one or more of 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate and 4-hydroxybutyl acrylate, and the adding amount of the hydrophilic monomer is 5-30% of the mass of the acrylic derivative polymer raw material.
The basic monomer includes but is not limited to one or more of (meth) acrylamide, (meth) acryloyl morpholine and N, N-dimethylacrylamide, and the adding amount of the basic monomer is 0.5-15% of the mass of the acrylic derivative polymer raw material.
< preparation of acrylic derivative Polymer >
Production example 1
75.5g of isooctyl acrylate, 14g of isobornyl acrylate, 10g of hydroxyethyl acrylate, and 0.5g of (meth) acrylamide were charged into a reaction vessel equipped with a cooling tube, a thermometer, a stirring device, a dropping funnel, and a nitrogen injection tube, and heated from room temperature (25 ℃) to 50 ℃ for 15 minutes while replacing with nitrogen gas with an air volume of 100 mL/minute. Then, while maintaining the temperature at 50 ℃, 0.06g of azobisisoheptonitrile was dissolved in 15.1g of isooctyl acrylate, 2.8g of isobornyl acrylate, 2g of hydroxyethyl acrylate, and 0.1g of (meth) acrylamide as additional monomers to prepare a solution, and the solution was added to the reaction vessel 4 to 6 times in 1 hour, and after the addition was completed, the reaction was further carried out for 1 hour to obtain an acrylic ester polymer a.
Production example 2
75.5g of isooctyl acrylate, 7g of isobornyl acrylate, 10g of hydroxyethyl acrylate, 2.5g of (meth) acrylamide and 5g of (meth) acryloylmorpholine were charged into a reaction vessel equipped with a cooling tube, a thermometer, a stirrer, a dropping funnel and a nitrogen-injecting tube, and heated from room temperature (25 ℃) to 50 ℃ for 15 minutes while replacing with nitrogen gas with an air volume of 100 mL/minute. Then, while maintaining the temperature at 50 ℃, 0.06g of azobisisoheptonitrile was dissolved in 15.1g of isooctyl acrylate, 1.4g of isobornyl acrylate, 2g of hydroxyethyl acrylate, 0.5g of (meth) acrylamide and 1g of (meth) acryloylmorpholine as additional monomers to prepare a solution, and the solution was added to the reaction vessel 4 to 6 times within 1 hour, and after the addition was completed, the reaction was further carried out for 1 hour to obtain an acrylate polymer B.
Production example 3
A reaction vessel equipped with a cooling tube, a thermometer, a stirring device, a dropping funnel and a nitrogen injection tube was charged with 70g of isooctyl acrylate, 5g of isobornyl acrylate, 10g of hydroxyethyl acrylate, 1g of (meth) acrylamide and 14g of (meth) acryloylmorpholine, and heated from room temperature (25 ℃) to 50 ℃ for 15 minutes while replacing with nitrogen gas with an air volume of 100 mL/minute. Thereafter, while maintaining the temperature at 50 ℃, a solution prepared by dissolving azobisisoheptonitrile in an amount of 0.06g was used as additional monomers including isooctyl acrylate 14g, isobornyl acrylate 1g, hydroxyethyl acrylate 2g, (meth) acrylamide 0.2g and (meth) acryloylmorpholine 2.8g, and the solution was charged into a reaction vessel 4 to 6 times in 1 hour, and after the completion of the charging, the reaction was further carried out for 1 hour to obtain an acrylic ester polymer C.
Production example 4
A reaction vessel equipped with a cooling tube, a thermometer, a stirring device, a dropping funnel and a nitrogen injection tube was charged with 66g of isooctyl acrylate, 10g of isobornyl acrylate, 10g of hydroxyethyl acrylate, 2g of (meth) acrylamide and 12g of (meth) acryloylmorpholine, and heated from room temperature (25 ℃) to 50 ℃ for 15 minutes while replacing with nitrogen gas with an air volume of 100 mL/minute. Then, while maintaining the temperature at 50 ℃, using 13.2g of isooctyl acrylate, 2g of isobornyl acrylate, 2g of hydroxyethyl acrylate, 0.4g of (meth) acrylamide and 2.4g of (meth) acryloylmorpholine as additional monomers, 0.06g of azobisisoheptonitrile was dissolved therein to prepare a solution, and the solution was added to the reaction vessel 4 to 6 times within 1 hour, and after the addition was completed, the reaction was further carried out for 1 hour to obtain an acrylic ester polymer D.
Production example 5
76g of isooctyl acrylate, 14g of isobornyl acrylate, and 10g of hydroxyethyl acrylate were charged into a reaction vessel equipped with a cooling tube, a thermometer, a stirring device, a dropping funnel, and a nitrogen-injecting tube, and the mixture was heated from room temperature (25 ℃ C.) to 50 ℃ for 15 minutes while replacing the nitrogen with an air volume of 100 mL/minute. Then, while maintaining the temperature at 50 ℃, 0.06g of azobisisoheptonitrile was dissolved in 15.2g of isooctyl acrylate, 2.8g of isobornyl acrylate, and 2g of hydroxyethyl acrylate as additional monomers to prepare a solution, and the solution was added to the reaction vessel 4 to 6 times in 1 hour, and after the addition was completed, the reaction was further carried out for 1 hour to obtain an acrylic ester polymer E.
Production example 6
A reaction vessel equipped with a cooling tube, a thermometer, a stirrer, a dropping funnel and a nitrogen injection tube was charged with 66g of isooctyl acrylate, 10g of hydroxyethyl acrylate, 4g of (meth) acrylamide and 20g of (meth) acryloylmorpholine, and heated from room temperature (25 ℃) to 50 ℃ for 15 minutes while replacing the nitrogen with 100 mL/minute of air flow. Thereafter, using 13.2g of isooctyl acrylate, 2g of hydroxyethyl acrylate, (meth) acrylamide, and 4g of (meth) acryloylmorpholine as additional monomers while maintaining the temperature at 50 ℃, 0.06g of azobisisoheptonitrile was dissolved to prepare a solution, and this solution was added to the reaction vessel 4 to 6 times in 1 hour, and after the addition was completed, the reaction was further carried out for 1 hour to obtain an acrylate polymer F.
Production example 7
Adding 75.5G of isooctyl acrylate, 7G of isobornyl acrylate, 10G of hydroxyethyl acrylate and 2.5G of (methyl) acrylamide into a reaction vessel with a stirring device and a nitrogen injection tube, uniformly stirring, performing nitrogen replacement with the air volume of 100 mL/min, irradiating by using a 365nm LED lamp until the viscosity reaches about 10000cp, then closing the nitrogen, and introducing compressed air for 2min to obtain the acrylate polymer G.
Production example 8
0.3g of isooctyl thioglycolate, 75.5g of isooctyl acrylate, 7g of isobornyl acrylate, 10g of hydroxyethyl acrylate, 2.5g of (meth) acrylamide, and 5g of (meth) acryloylmorpholine were charged into a reaction vessel equipped with a cooling tube, a thermometer, a stirring device, a dropping funnel, and a nitrogen gas injection tube, and heated from room temperature (25 ℃) to 50 ℃ for 15 minutes while replacing with nitrogen gas with an air flow of 100 mL/minute. Then, while maintaining the temperature at 50 ℃, 0.06g of azobisisoheptonitrile was dissolved in 15.1g of isooctyl acrylate, 1.4g of isobornyl acrylate, 2g of hydroxyethyl acrylate, 0.5g of (meth) acrylamide and 1g of (meth) acryloylmorpholine as additional monomers to prepare a solution, and the solution was added to the reaction vessel 4 to 6 times within 1 hour, and after the addition was completed, the reaction was further carried out for 1 hour to obtain an acrylic ester polymer H.
< sample matching and adhesive sheet production >
Example 1
100g of the acrylic derivative polymer A obtained in production example 1, 0.5g of benzil dimethyl ether and 0.3g of 4-acryloyloxybenzoic acid phenone (4 ABP) were weighed, and dissolved uniformly under stirring and then degassed under a vacuum of 0.95MPa for 2 hours to obtain an adhesive resin composition for adhesive sheets.
Then, the adhesive resin composition for adhesive sheet obtained in the above was dropped on a polyethylene terephthalate (PET) release film (release surface contact adhesive resin composition), and then another PET release film was covered thereon (release surface contact adhesive resin composition), and the adhesive resin composition for adhesive sheet was coated in a sheet form with a roll, and irradiated with ultraviolet rays (intensity of 1 mW/cm) using an ultraviolet ray irradiation apparatus 2 The energy is 600mJ/cm 2 ) To obtain a transparent adhesive sheet.
Examples 2 to 6 and comparative examples 1 to 6
As shown in the following table, all the steps were the same as in example 1 except that the kind and amount of the acrylic derivative polymer added or the hydrogen abstraction-type initiator added were different.
Example 7
As shown in the following Table, the ultraviolet intensity for the coating curing step was reduced to 0.65mW/cm except that the acrylic derivative polymer B was added 2 Except that, all the steps were the same as in example 1.
Example 8
As shown in the following table, all the steps were the same as in example 1 except that the acrylic derivative polymer added was G.
Comparative example 7
100g of the acrylic derivative polymer B obtained in production example 2, 0.5g of benzildimethyl ether, 0.2g of 1, 6-hexanediol diacrylate (HDDA), and 0.3g of 4-acryloyloxybenzophenone (4 ABP) were weighed, stirred and dissolved uniformly, and then degassed under a vacuum of 0.95MPa for 2 hours to obtain an adhesive resin composition for an adhesive sheet.
The procedure for preparing an adhesive sheet was as in example 1.
Comparative example 8
100g of the acrylic derivative polymer B obtained in production example 2, 0.5g of benzildimethyl ether, 0.3g of 1, 6-hexanediol diacrylate (HDDA), and 0.3g of 4-acryloyloxybenzophenone (4 ABP) were weighed, and after uniformly stirred and dissolved, the mixture was degassed under a vacuum of 0.95MPa for 2 hours to obtain an adhesive resin composition for an adhesive sheet.
The procedure for preparing an adhesive sheet was as in example 1.
Comparative example 9
As shown in the following Table, the intensity of ultraviolet ray for the coating curing step was increased to 50mW/cm except that the acrylic derivative polymer added was H 2 Except that, all the steps were the same as in example 1.
The adhesive sheets obtained in the above examples and comparative examples were evaluated in the following manner, and the evaluation results are shown in the following table.
(ii) measurement of glass transition temperature, loss modulus of elasticity and storage modulus of elasticity
An adhesive sheet having a thickness of 0.5mm, a width of 10mm and a length of 10mm was prepared, and the measurement was carried out in a share sandwich mode at a frequency of 1.0Hz, a measurement temperature range of-40 to 80 ℃ and a temperature rise rate of 5 ℃/min by using a wide-range dynamic viscoelasticity measuring apparatus (solid Analyzer RSA-II, manufactured by Pheometry Scientific Co., ltd.).
The glass transition temperature (Tg) in the present application is a temperature at which tan δ exhibits a peak within the above measurement temperature range. When 2 or more tan δ peaks are observed in this temperature range, the glass transition temperature is defined as the temperature at which the tan δ value becomes maximum.
(II) evaluation of filling Property
The prepared adhesive sheet (adhesive film thickness: 150 μm) was attached to a glass cover plate (ink step difference: 30 μm) of a mobile phone in an appropriate size, and was adhered at 25 ℃ under atmospheric pressure with a rubber roller (roller diameter: 50mm, roller width: 210 mm) under a load of 2 kg. Next, the display module and the glass cover were bonded together in a bonding machine (lakawa TPL-0512 MH) at room temperature and 1000Pa under a press condition of 0.2mpa and 10s. Then, defoaming was performed at 45 ℃ and 0.4MPa for 15min, and the mixture was allowed to stand at room temperature for 24 hours. Whether or not there was any adhesion failure such as air bubbles was observed. If there are bubbles, the filling property is considered to be poor, and if there are no bubbles, the filling property is considered to be passed.
(III) evaluation of storage stability
The storage stability means that the adhesive film does not overflow in the storage process, and the specific evaluation method comprises the following steps:
sandwiching the adhesive film between two release films, and applying 200N/m on the upper release film 2 And (3) placing the film in an oven at 40 ℃ for 7 days, and observing the change of the marginal position of the adhesive film before and after aging, wherein if the change distance is more than 0.15mm, the film is marked as poor storage stability, and if the change distance is not more than 0.15mm, the film is marked as pass.
(IV) evaluation of reliability
The reliability refers to the capability of a finished product after the adhesive film is pasted to resist bubbles, floating and peeling under different environmental conditions, and the specific evaluation method comprises the following steps:
the (glass-adhesive film-display module) assembly was set at 3000mJ/cm 2 After post-curing at 85 ℃ and 85% RH for 500 hours, the mixture was cooled to room temperature and then observed for the occurrence of blisters. If the bubble is present, the bubble is considered to be bad, otherwise, the bubble is recorded as passing.
Adhesive sheets were obtained in the same manner as in example 1, except that the compounding amounts were as shown in tables 1, 2 and 3. The results of the evaluation in the same manner as in example 1 are shown in tables 1, 2 and 3.
1. The effect of varying amounts of basic monomer on the adhesive sheet properties is shown in Table 1.
TABLE 1
In Table 1, examples 1 to 4 and comparative examples 1 to 2, the content of the basic monomer in the acrylic derivative polymer material was 0.5%, 7.5%, 15%, 14%, 0%, 24%, respectively, and the coating curing intensity was 1mW/cm in the same photoinitiator 2 When the content of the basic monomer in the acrylic derivative polymer is lower than 0.5%, the glass transition temperature of the product is lower than-23 ℃, so that the storage stability and reliability of the product are poor; when the content of the basic monomer in the acrylic derivative polymer is more than 15%, or when the glass transition temperature of the product is more than 0 ℃, the filling property of the product is affected.
2. The effect of different types and amounts of hydrogen abstraction-type UV initiators on the performance of the adhesive sheets is shown in Table 2.
TABLE 2
As can be seen from Table 2, under otherwise comparable conditions, the absence of the hydrogen abstraction-type UV initiator such as 4ABP or 4MBP results in poor reliability of the adhesive sheet, and if the amount of 4ABP or 4MBP added exceeds 1% of the amount of acrylic derivative polymer, the filling properties of the adhesive sheet will be poor.
3. The effect of different Tan δ on the performance of the adhesive sheets is shown in Table 3.
TABLE 3
From table 3, it can be seen that under the condition that other components are not changed, the addition of HDDA causes the tan δ value to be reduced, and further causes the reliability of the product to be lengthened, and the more the addition amount is, the more the tan δ value between 25 ℃ and 55 ℃ is reduced, and further causes the influence on the filling property of the product, and from table 3 in combination with tables 1 and 2, it can be seen that the tan δ value between 25 ℃ and 100 ℃ of the product needs to be controlled to be 0.42 to 0.84 while the glass transition temperature of the product is controlled to be-23 ℃ to 0 ℃, otherwise, the reliability, the storage stability and the filling property of the adhesive sheet are influenced.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (9)
1. An adhesive film for an image display device, characterized in that the adhesive film has a glass transition temperature of-23 to 0 ℃ and a tan δ of 0.42 to 0.84 at 25 to 100 ℃, the glass transition temperature being a temperature at which tan δ shows a peak within-40 to 80 ℃, the tan δ being a value obtained by dividing a loss modulus by a storage modulus, the adhesive film comprising the following components:
1) An acrylic derivative polymer comprising the following raw materials: C4-C18 acrylate monomer, hydrophilic monomer and alkaline monomer;
2) A photoinitiator which comprises a hydrogen abstraction type ultraviolet initiator and a cracking type ultraviolet initiator,
wherein the adding amount of the alkaline monomer is 0.5-15% of the mass of the acrylic derivative polymer raw material, and the using amount of the hydrogen abstraction type ultraviolet initiator is 0.1-1% of the mass of the acrylic derivative polymer.
2. The adhesive film for image display device according to claim 1, wherein the C4-C18 acrylate monomer is one or more selected from the group consisting of butyl (meth) acrylate, isooctyl (meth) acrylate, isobornyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, cyclohexyl (meth) acrylate, n-octyl (meth) acrylate, dodecyl (meth) acrylate, stearyl (meth) acrylate and isostearyl (meth) acrylate, and the amount of the C4-C18 acrylate monomer added is 50 to 95% by mass of the raw material of the acrylic derivative polymer.
3. The adhesive film for image display device according to claim 1, wherein the hydrophilic monomer is one or more selected from the group consisting of hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and 4-hydroxybutyl acrylate, and is added in an amount of 5 to 30% by mass based on the mass of the acrylic derivative polymer raw material.
4. The adhesive film for image display device according to claim 1, wherein the basic monomer is one or more selected from the group consisting of (meth) acrylamide, (meth) acryloylmorpholine, and N, N-dimethylacrylamide.
5. The adhesive film for image display device according to claim 1, wherein the hydrogen abstraction-type ultraviolet photoinitiator is one or more selected from the group consisting of 4-methylbenzophenone, benzophenone, and 4-acryloyloxybenzophenone.
6. The adhesive film for image display device according to claim 1, wherein the cleavage type ultraviolet light initiator is selected from one or more of benzoin derivatives, benzil ketal derivatives, dialkoxyacetophenones, α -hydroxyalkylphenylketones, α -aminoalkylphenones, acylphosphine oxides, esterified oxime ketone compounds, aryl peroxy ester compounds, halogenated methyl aryl ketones, organic sulfur compounds, and benzoyl esters, and is used in an amount of 0.1 to 2% by mass based on the acrylic derivative polymer.
7. The adhesive film for image display device according to claim 1, wherein the adhesive film comprises the following components:
1) The acrylic acid derivative polymer comprises the following raw materials in percentage by mass: 75-89.5% of C4-C18 acrylate monomer, 10% of hydrophilic monomer and the balance of alkaline monomer;
2) The photoinitiator adopts a hydrogen abstraction type ultraviolet initiator and a cracking type ultraviolet initiator, wherein the cracking type ultraviolet initiator adopts benzil dimethyl ether, the hydrogen abstraction type ultraviolet initiator adopts 4-acrylyl oxybenzoic acid benzophenone or 4-methyl benzophenone, and the adding amount of the hydrogen abstraction type ultraviolet initiator is 0.1-1% of the mass of the acrylic derivative polymer;
and the adhesive film has a glass transition temperature of-23 to 0 ℃ and a tan delta of 0.42 to 0.84 at 25 to 100 ℃, the glass transition temperature being a temperature at which tan delta shows a peak value within-40 to 80 ℃, the tan delta being a value obtained by dividing a loss modulus by a storage modulus.
8. An image display device, wherein a layer to which the image display device according to claim 1 is adhered with an adhesive film is provided on a visible side.
9. The image display device according to claim 8, which has the adhesive film for an image display device according to claim 1 between a transparent protective plate and a touch panel or between a transparent protective plate and an image display unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111127894.7A CN113861854B (en) | 2021-12-08 | 2021-12-08 | Adhesive film for image display device and image display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111127894.7A CN113861854B (en) | 2021-12-08 | 2021-12-08 | Adhesive film for image display device and image display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113861854A CN113861854A (en) | 2021-12-31 |
| CN113861854B true CN113861854B (en) | 2023-03-31 |
Family
ID=78994353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111127894.7A Active CN113861854B (en) | 2021-12-08 | 2021-12-08 | Adhesive film for image display device and image display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113861854B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115536774A (en) * | 2022-10-11 | 2022-12-30 | 博立尔化工（扬州）有限公司 | Method for reducing residual monomers in amino-containing acrylic resin |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103249796A (en) * | 2010-12-10 | 2013-08-14 | 日立化成株式会社 | Optical adhesive resin composition, optical adhesive sheet, image display device, method for producing optical adhesive sheet, and method for producing image display device |
| CN110168035A (en) * | 2017-02-08 | 2019-08-23 | 日东电工株式会社 | Polarizing coating adhesive composite, polarizing coating, optical film and image display device |
| CN112625623A (en) * | 2020-09-27 | 2021-04-09 | 新纶科技（常州）有限公司 | Adhesive for flexible display and flexible display assembly layer |
| WO2021199571A1 (en) * | 2020-03-31 | 2021-10-07 | 三菱ケミカル株式会社 | Active energy ray-curable adhesive sheet, adhesive sheet, laminate for image display device, image display device, and method for producing laminate for constituting image display device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006088099A1 (en) * | 2005-02-16 | 2006-08-24 | The Nippon Synthetic Chemical Industry Co., Ltd. | Adhesive for optical member and method for producing adhesive for optical member |
| CN101490194A (en) * | 2006-07-18 | 2009-07-22 | 日本合成化学工业株式会社 | Resin composition, adhesive for temporary surface protection, adhesive sheet, and method for producing adhesive sheet |
| US20130300954A1 (en) * | 2010-12-10 | 2013-11-14 | Hitachi Chemical Company, Ltd | Adhesive sheet for image display device, image display device, and adhesive resin composition |
| JP2016069529A (en) * | 2014-09-30 | 2016-05-09 | 日立化成株式会社 | Adhesive sheet for image display unit, manufacturing method of image display unit and image display unit |
| JP6757479B2 (en) * | 2019-01-30 | 2020-09-16 | 日東電工株式会社 | Adhesive sheets, optical films with adhesive layers, laminates, and image displays |
-
2021
- 2021-12-08 CN CN202111127894.7A patent/CN113861854B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103249796A (en) * | 2010-12-10 | 2013-08-14 | 日立化成株式会社 | Optical adhesive resin composition, optical adhesive sheet, image display device, method for producing optical adhesive sheet, and method for producing image display device |
| CN110168035A (en) * | 2017-02-08 | 2019-08-23 | 日东电工株式会社 | Polarizing coating adhesive composite, polarizing coating, optical film and image display device |
| WO2021199571A1 (en) * | 2020-03-31 | 2021-10-07 | 三菱ケミカル株式会社 | Active energy ray-curable adhesive sheet, adhesive sheet, laminate for image display device, image display device, and method for producing laminate for constituting image display device |
| CN112625623A (en) * | 2020-09-27 | 2021-04-09 | 新纶科技（常州）有限公司 | Adhesive for flexible display and flexible display assembly layer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113861854A (en) | 2021-12-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102099432B (en) | Pressure-sensitive adhesive composition, polarization plate, and liquid crystal display | |
| JP6479856B2 (en) | Pressure-sensitive adhesive sheet, method for producing the same, and method for producing an optical member using the same | |
| JP5599177B2 (en) | Optical pressure-sensitive adhesive composition, optical pressure-sensitive adhesive, and optical film | |
| JP5596262B2 (en) | Adhesive sheet | |
| KR20120056176A (en) | Pressure-sensitive adhesive composition for touch panel, pressure-sensitive adhesive film and touch panel | |
| KR20140116444A (en) | Adhesive tape composition and adhesive tape prepared from same | |
| WO2011043269A1 (en) | Process for production of pressure-sensitive adhesive composition, process for production of pressure-sensitive adhesive film, raw material composition for pressure-sensitive adhesive, and pressure-sensitive adhesive film | |
| JP7282687B2 (en) | OPTICAL TRANSPARENT ADHESIVE SHEET, COMPOSITION FOR MANUFACTURING THE SAME AND FLAT DISPLAY DEVICE USING THE SAME | |
| CN108463526A (en) | Curable compositions, contact adhesive, adhesive tape and attachment product | |
| JP6490802B2 (en) | Adhesive composition for touch screen panel, optical adhesive film, and touch screen panel | |
| JP2014025073A (en) | Pressure-sensitive adhesive sheet | |
| WO2023123747A1 (en) | Hydrogen abstraction photoinitiator, preparation method therefor, and use thereof | |
| CN113861854B (en) | Adhesive film for image display device and image display device | |
| CN115124928A (en) | OCA optical glue for curved surface screen, adhesive film and preparation method thereof | |
| KR20120056175A (en) | Pressure-sensitive adhesive composition for touch panel, pressure-sensitive adhesive film and touch panel | |
| CN112760044B (en) | High-dielectric optical cement | |
| JP7278967B2 (en) | Optical transparent adhesive sheet | |
| KR20080093508A (en) | Manufacturing method of acryl pressure sensitive adhesive for polarizing film | |
| KR20170116900A (en) | Adhesive composition for optical use, method of producing the same, and adhesive film for optical use | |
| TW202026385A (en) | Adhesive composition for surface protection sheet and surface protective sheet | |
| CN115895468A (en) | Adhesive film for curved-surface image display device, preparation method of adhesive film and image display device | |
| CN116285760B (en) | Touch screen double-sided optical tape and preparation method thereof | |
| CN115537124B (en) | Post-curable optical adhesive, OCA optical adhesive and preparation method thereof | |
| CN114231217B (en) | Optically transparent adhesive composition and optically transparent adhesive film | |
| CN115895494A (en) | Adhesive film for plastic image display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |