KR102547339B1 - Anti-scattering film, and electronic display and electronic device including the same - Google Patents

Abstract

An anti-shattering film and an electronic display and electronic device including the same are disclosed. The anti-scattering film is a base layer; a first color layer containing a reversible pigment; and an adhesive layer in this order, and the reversible pigment may be a pigment whose color changes depending on temperature.

Description

Anti-scattering film, and electronic display and electronic device including the same {Anti-scattering film, and electronic display and electronic device including the same}

It relates to an anti-shattering film and an electronic display and electronic device including the same.

The anti-shattering film is, for example, an adhesive film for decoration applied to a smartphone back cover. It is an adhesive film that maintains the unique gloss and texture and high surface hardness of tempered glass by applying printing technology to the film, which is difficult to express on tempered glass substrates, and has various decorative effects and the effect of preventing glass fragments from scattering from impact. The anti-scattering film (Anti-Scattering Film, ASF) is also called a decoration film.

Recently, various designs are required for electronic displays, for example, smartphone back covers, and the demand for anti-shattering films is rapidly increasing.

Until now, various designs have been implemented through processes such as gradation coating, UV molding, color coating, and deposition using transparent anti-shattering films, but the demand for new designs is increasing.

Therefore, there is still a need for an anti-shattering film capable of implementing various designs and an electronic display and electronic device including the same.

One aspect is to provide an anti-shattering film that can implement designs of various colors by changing color depending on temperature, has high adhesion to glass, and excellent bubble removal ability, and has no orange peel or adhesive transfer.

Another aspect is provided with an electronic display including the anti-shattering film.

In another aspect, an electronic device including the electronic display is provided.

According to one aspect,

base layer;

a first color layer containing a reversible pigment; and

Including an adhesive layer; in this order,

The reversible pigment is a pigment that changes color depending on temperature, and an anti-scattering film is provided.

The reversible pigment may include a zion pigment that changes to a transparent color at 40° C. or higher.

The thickness of the first color layer may be 5 to 13 μm.

The adhesive layer may have a thickness of 15 to 50 μm.

The glass transition temperature (T _g ) of the adhesive layer may be -15 to 0 °C.

The adhesive strength of the adhesive layer to glass may be 15 N/inch or more.

A primer layer may be further included between the base layer and the first color layer.

The thickness of the primer layer may be 0.1 to 3 μm.

A second color layer may be further included on the first color layer.

The second color layer may have a thickness of 2 μm to 10 μm.

A release film may be further included on the adhesive layer.

According to other aspects,

An electronic display comprising the aforementioned anti-shattering film is provided.

According to another aspect,

An electronic device including the aforementioned electronic display is provided.

The anti-scattering film according to one aspect includes a first color layer including a reversible pigment whose color changes according to temperature between the base layer and the adhesive layer. The anti-shattering film can implement designs of various colors, has high adhesion to glass, and excellent bubble removal ability, and can provide an anti-shattering film without orange peel and adhesive transfer. The anti-shattering film is suitable for application as a decoration film for a smartphone back cover.

1 is a schematic cross-sectional view of an anti-shattering film according to one embodiment.
Figure 2 is a schematic cross-sectional view of an anti-shattering film according to another embodiment.
Figure 3 is a schematic cross-sectional view of an anti-shattering film according to another embodiment.
Figure 4 is a schematic cross-sectional view of an anti-shattering film according to another embodiment.
5 is a photograph showing color visibility at room temperature after peeling off the release film and attaching it to glass with respect to the anti-scattering film produced by Example 1.
6 is a photograph showing color visibility at 40 ° C. after peeling off the release film and attaching it to glass with respect to the anti-scattering film produced by Example 1.

Hereinafter, with reference to the embodiments and drawings of the present invention, an anti-shattering film, and an electronic display and electronic device including the same will be described in detail. These examples are only presented as examples to explain the present invention in more detail, and it will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples. .

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.

Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, suitable methods and materials are described herein.

In this specification, the term "include" means that other components may be further included without excluding other components unless otherwise stated.

The term "combination of these" as used herein means a mixture or combination of one or more of the recited elements.

The term “and/or” as used herein is meant to include any and all combinations of one or more of the items listed in relation to it. The term "or" as used herein means "and/or". The expression "at least one" or "one or more" in front of elements in this specification does not mean that the list of entire elements can be supplemented and individual elements of the description can be supplemented.

In this specification, when an element is referred to as being disposed “on” or “above” another element, one element may be directly disposed on the other element, or elements intervened between the elements may be present. may exist. On the other hand, when an element is referred to as being disposed “directly on” or “directly over” another element, intervening elements may not be present.

In the present specification, "~ polymer" or "~ copolymer" is a broad concept including "~ polymer", "~ copolymer", or/and "~ polymer or derivative of copolymer".

Anti-shattering film according to one embodiment is a base layer; a first color layer containing a reversible pigment; and an adhesive layer in this order, and the reversible pigment may be a pigment whose color changes depending on temperature.

The anti-shattering film can implement designs of various colors, has high adhesion to glass, and excellent bubble removal ability, and can provide an anti-shattering film without orange peel and adhesive transfer.

1 is a schematic cross-sectional view of an anti-shattering film according to one embodiment.

As shown in FIG. 1, the anti-shattering film 10 includes a base layer 1, a first color layer 2, and an adhesive layer 3 in this order.

The base layer 1 may be in the form of a film or sheet. The substrate layer 1 may be a polymer film of a polycarbonate-based resin, a polyolefin-based resin, a polyvinyl-based resin, a polyester-based resin, or a combination thereof. For example, the base layer 1 may be a polyester-based resin film. The base layer 1 may use a synthetic linear polyester film, for example, a polymer film having high light transmittance such as a polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) film having both light transmittance and thermal stability. there is.

The thickness of the base layer 1 may be 38 to 75 μm. For example, the thickness of the base layer 1 may be 40 to 70 μm. When the thickness of the base layer 1 is out of the above range, handling defects such as stamping or folding may increase during handling of the anti-shattering film 10, and it affects the light transmittance of the visible light wavelength range to prevent scattering of the film. After decorating, the initially intended design cannot be realized.

The first color layer 2 may include a reversible pigment. The reversible pigment is a pigment whose color changes with temperature. The reversible pigment may include a Zion pigment that changes to a transparent color at a temperature of 40 °C or higher. The Zion pigment is a micro-sized capsule particle that changes to a transparent color at a temperature of 40 °C or higher.

The reason why the zion pigment is discolored according to the temperature change will be explained in more detail below, but this is to help the understanding of the present invention, and the scope of the present invention is not limited to the scope of the description below.

The Zion pigment has a structure in which a discoloration material that changes color depending on the temperature is encapsulated together with a solid solvent in a micro-sized capsule. The solid solvent is dissolved and changed into a liquid as the temperature rises. At this time, the two materials representing the color, that is, the color former that determines the color and the color developer that determines the density of the color, are separated and become transparent. indicates

The first color layer 2 may be formed by curing a composition for forming a first color layer including a UV acrylic resin binder, zion pigment, a dispersant, and a solvent by irradiating with a UV lamp. As the UV acrylic resin binder, all UV acrylic resin binders usable in the art may be used.

The content of the Zion pigment may be 5 to 20 parts by weight based on 100 parts by weight of the UV acrylic resin binder. For example, the content of the zion pigment may be 5 to 15 parts by weight or 5 to 10 parts by weight based on 100 parts by weight of the UV acrylic resin binder. When the content of the Zion pigment is less than 5 parts by weight, the color becomes pale and visibility is reduced. When the content of the Zion pigment exceeds 20 parts by weight, curing of the UV acrylic resin binder is hindered, so that the first color layer 2 is easily separated or the Zion pigment is agglomerated, which has a fatal effect on the appearance.

Examples of the dispersant include acrylate-based dispersants such as butyl (meth)acrylate and N,N-dimethylaminoethyl (meth)acrylate; Styrene-acrylic acid resin, styrene-methacrylic acid resin, styrene-acrylic acid-acrylic acid ester resin, styrene-maleic acid resin, styrene-acrylic acid-acrylic acid ester resin, styrene-maleic acid ester resin, methacrylic acid-methacrylic acid ester resin, acrylic acid - Resins containing ethylenic double bonds such as acrylic acid ester resins, isobutylene-maleic acid resins, and vinyl-ester resins; Polyurethane, polycarboxylic acid ester, unsaturated polyamide, polycarboxylic acid, polysiloxane, (meth)acrylic acid-styrene copolymer, (meth)acrylic acid-(meth)acrylate ester copolymer, polyvinyl alcohol, polyvinylpy resin-type dispersants such as rolidone, polyester, modified polyacrylate, phosphate ester, and polycarboxylic acid; and mixtures thereof, but are not limited thereto.

The dispersant may be used alone or in combination of two or more. The content of the dispersant may be appropriately used within a range not deteriorating the effect of the present invention, but may be, for example, 0.1 to 10 parts by weight based on 100 parts by weight of the UV acrylic resin binder.

Examples of the solvent include (poly)alkylene glycol monoalkyl ethers such as diethylene glycol monoethyl ether, propylene glycol monomethyl ether, and propylene glycol monoethyl ether; (poly)alkylene glycol monoalkyl ether acetates such as ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, propylene glycol monomethyl ether acetate, and propylene glycol monoethyl ether acetate; ethers such as diethylene glycol diethyl ether, diethylene glycol methyl ethyl ether, and tetrahydrofuran; ketones such as methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, 2-heptanone, and 3-heptanone; alcohols such as ethanol, propanol, butanol, hexanol, cyclohexanol, ethylene glycol, diethylene glycol, and glycerin; and mixtures thereof, but are not limited thereto. These solvents may be used alone or in combination of two or more. The amount of the solvent may be appropriately used within a range not deteriorating the effect of the present invention, but may be, for example, 5 to 50 parts by weight based on 100 parts by weight of the UV acrylic resin binder.

If necessary, the composition for forming the first color layer further includes a dispersing aid that assists the action of the dispersant to shorten the dispersion time of the pigment dispersion and more stably maintains the viscosity of the composition for forming the first color layer. can do. As the dispersing aid, those commonly used may be used. Also, the composition for forming the first color layer may include a dispersing aid in an amount of 1 to 10 parts by weight based on 100 parts by weight of the cyan pigment.

The thickness of the first color layer 2 may be 5 to 13 μm. If the first color layer 2 is within the above thickness range, color change due to temperature change may be observed with the naked eye, and a problem of adhesion to glass may not occur.

The adhesive used in the adhesive layer 3 is not particularly limited and can be used as long as it can be re-peelably adhered without contamination of the adhesive transfer on the glass or tempered glass to be adhered. The pressure-sensitive adhesive may include an acrylic polymer, a rubber polymer, a vinyl polymer, an ester polymer, a styrenic polymer, an alkylene polymer, a urethane polymer, an ester polymer, a combination thereof, or a copolymer thereof. For example, the pressure-sensitive adhesive may include acrylic, natural rubber, synthetic rubber, ethylene-vinyl acetate copolymer, ethylene-acrylic acid ester, styrene-isoprene block copolymer, styrene-butadiene block copolymer, polyurethane, or polyester. can

For example, as the pressure-sensitive adhesive, an acrylic polymer having high transparency and good adhesion to the optical sheet may be used.

The acrylic polymer may be formed by polymerization of at least one acrylic monomer and at least one carboxyl group-containing unsaturated monomer. The acrylic monomer is, for example, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, isobutyl (meth) acrylate, t -butyl ( meth)acrylate, cyclohexyl (meth)acrylate, ethylhexyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate , 2-hydroxy-3-chloropropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, glycerol (meth)acrylate, methyl α-hydroxymethyl acrylate, ethyl α-hydroxymethyl acrylate Rate, propyl α-hydroxymethyl acrylate, butyl α-hydroxymethyl acrylate, 2-methoxyethyl (meth) acrylate, 3-methoxybutyl (meth) acrylate, ethoxydiethylene glycol (meth) acrylate Latex, methoxytriethylene glycol (meth)acrylate, methoxytripropylene glycol (meth)acrylate, poly(ethylene glycol) methyl ether (meth)acrylate, tetrafluoropropyl (meth)acrylate, 1,1 ,1,3,3,3-hexafluoroisopropyl (meth)acrylate, octafluoropentyl (meth)acrylate, heptadecafluorodecyl (meth)acrylate, isobornyl (meth)acrylate, dicy clofentanyl(meth)acrylate, dicyclopentenyl(meth)acrylate, dicyclopentanyloxyethyl(meth)acrylate, dicyclopentenyloxyethyl(meth)acrylate, and mixtures thereof. For example, the acrylic monomer may include methyl (meth)acrylate, butyl (meth)acrylate, and mixtures thereof. The carboxyl group-containing unsaturated monomer is, for example, acrylic acid, methacrylic acid, 2-(meth)acryloyloxy acetic acid, 3-(meth)acryloyloxy propyl acid, 4-(meth)acryloyloxy butyric acid , acrylic acid duplexes, itaconic acid, maleic acid, maleic anhydride, and mixtures thereof.

The thickness of the adhesive layer 3 may be 15 to 50 μm. If the thickness of the adhesive layer 3 is within the above range, defects due to pressing can be prevented and the adhesive strength of the adhesive layer can be properly maintained.

The adhesive layer 3 may have a glass transition temperature (T _g ) of -15 to 0 °C in order to remove air bubbles after being laminated to glass and to suppress pressing by external foreign substances.

The adhesive layer 3 may have an adhesive strength of 15 N/inch or more to glass in order to prevent glass from scattering when the glass is broken. For example, the adhesion of the adhesive layer 3 to glass may be 15 to 30 N/inch. When the adhesion of the adhesive layer 3 to the glass is within the above range, a sufficient anti-scattering effect may be obtained, and a rework process for glass recycling may be facilitated when the process is defective.

The adhesive layer 3 may further include a curing agent. The curing agent is not particularly limited as long as it is a material capable of curing the polymer resin. For example, the curing agent may be an isocyanate-based curing agent, an epoxy-based curing agent, an aziridine-based curing agent, or a combination thereof. The curing agent may be included in an amount of 0.5 to 1.0% by weight based on the total weight of the adhesive layer 3 . If the content of the curing agent is within the above range, the adhesive strength does not decrease, and durability does not decrease in a heat-resistant and moisture-resistant environment and pressing when winding the product does not occur.

Figure 2 is a schematic cross-sectional view of an anti-shattering film according to another embodiment.

As shown in FIG. 2, the anti-scattering film 20 is arranged in the order of the base layer 11, the first color layer 12, the adhesive layer 13, and the release film 14.

The release film 14 may be a polyester film, but is not limited thereto, and all release film materials available in the art may be used.

Figure 3 is a schematic cross-sectional view of an anti-shattering film according to another embodiment.

As shown in FIG. 3, the anti-scattering film 30 is arranged in the order of the base layer 21, the first color layer 22, the adhesive layer 23, and the release film 24, and the base layer ( 21) and the first color layer 22, a primer layer 25 is additionally disposed.

The primer layer 25 is formed by applying a primer coating composition including a prepolymer and a curing agent onto the base layer 21 and then curing the primer layer 25 .

As an example of the prepolymer, a urethane prepolymer obtained by reacting a polyisocyanate and a polyol according to a known method may be used. The urethane prepolymer may have an isocyanate group or a hydroxyl group at a molecular terminal. The urethane prepolymer having an isocyanate group at the molecular terminal can be obtained by reacting a polyol and polyisocyanate under the condition that the equivalent ratio of polyisocyanate/polyol exceeds 1, and the urethane prepolymer having a hydroxyl group at the molecular terminal has the equivalence ratio of 1 It can be obtained by reacting under conditions below.

As an example of the curing agent, an oxazoline curing agent may be used. Examples of the oxazoline curing agent include 2,2'-bis(2-oxazoline), bis(2-oxazolinyl)methane, 1,2-bis(2-oxazolinyl)ethane, 1,3-bis( 2-oxazolinyl)propane or 1,4-bis(2-oxazolinyl)butane, especially 1,4-bis(2-oxazolinyl)benzene, 1,2-bis(2-oxazolinyl)benzene or bisoxazolines such as 1,3-bis(2-oxazolinyl)benzene. The content of the oxazoline curing agent may be 10 to 200 parts by weight based on 100 parts by weight of the urethane prepolymer. If the content of the oxazoline curing agent is less than 10 parts by weight, adhesion and bath resistance are not improved, and if it exceeds 200 parts by weight, the tackiness of the prepared coating layer is increased, as well as poor coating of the crude liquid from the viewpoint of workability there is a problem.

The curing agent may additionally use an isocyanate curing agent in addition to the oxazoline curing agent. The amount of the isocyanate curing agent may be 50 parts by weight or less or 30 parts by weight or less based on 100 parts by weight of the prepolymer. If the content of the isocyanate curing agent exceeds 50 parts by weight, the surface tacky property increases and a blocking phenomenon occurs.

Examples of the solvent used in the primer coating composition include cyclohexanone, methyl ethyl ketone, benzyl alcohol, diethylene glycol alkyl ether, phenoxypropanol, propylene glycol methyl ether acetate, tetrahydrofuran, N-methyl Pyrrolidone etc. can be used individually or in mixture of 2 or more types. If necessary, an aromatic or aliphatic hydrocarbon solvent such as toluene, xylene, or hexane may be added as a diluent in order to improve coating defects and adhesion to the base film. The amount of diluent should not exceed 40% of the solvent.

The solid content in the primer coating composition may be preferably 1 to 50% by weight. If the solid content does not reach 1% by weight, coating appearance may be defective, and if it exceeds 50% by weight, resin coatability and adhesion stability may be lowered.

The primer coating composition may further include silica particles subjected to surface treatment for the purpose of imparting anti-blocking properties.

In addition, antioxidants, stabilizers, additives for adjusting adhesion with other layers, and the like may be optionally added to the primer coating composition.

The primer coating composition is applied on the support film according to known methods such as gravure coating, micro gravure coating, knife coating, bar coating, roll coating, nip coating, and spin coating. Meanwhile, the application may be performed by offline coating or in-line coating depending on timing. Drying temperature can be adjusted back and forth according to drying equipment, wind direction conditions and line speed. In general, it can be sufficiently dried under the conditions of 130 ° C./30 s.

After drying the coating layer formed by thermal curing in the above-described method, the thickness of the primer layer may be 0.1 to 3 μm or 0.5 to 2 μm. If the thickness is less than 0.1 μm, the moisture resistance may be reduced, and if the thickness exceeds 3 μm, the appearance may deteriorate and adhesion may be deteriorated due to a severe rainbow phenomenon.

Figure 4 is a schematic cross-sectional view of an anti-shattering film according to another embodiment.

As shown in FIG. 4, the anti-scattering film 40 includes a base layer 31, a first color layer 32, a second color layer 33, an adhesive layer 34, and a release film 35 in order. is placed as A second color layer 33 is further disposed on the first color layer 32 . A release film 35 is additionally disposed on the adhesive layer 34 .

The second color layer 32 may be formed from a composition of R, G, B, Y, and K nano color pigments, an acrylic resin binder, and a dispersant. The pigment is not limited as long as it implements a color in the visible light range usable in the art. Examples of the pigments include carbon black, titanium black, oxides based on Cu-Fe-Mn, synthetic iron black, aniline black, lactam black, perylene black, C.I. pigment blue, C.I. pigment red, C.I. pigment green and these mixtures, but are not limited thereto. Examples of the composition and content of the acrylic resin binder, the dispersant, and the dispersing aid included as needed are the same as those of the UV acrylic resin binder, the dispersing agent, and the dispersing aid described in the composition for forming the first color layer, so the description below is omitted. .

The second color layer 33 may have a thickness of 2 to 10 μm.

The release film 35 may be a polyester-based film, but is not limited thereto, and all release film materials available in the art may be used.

An electronic display according to another embodiment may include the aforementioned anti-shattering film 10 . Examples of the electronic display may include an indoor and outdoor video display device, a portable personal terminal, a vehicle navigation device, a remote controller, an unmanned vehicle driving display device, or a drone control panel.

An electronic device according to another embodiment may include the aforementioned anti-shattering film 10 . The electronic device may include a mobile device or a communication electronic device.

Hereinafter, the configuration of the present invention and its effects will be described in more detail through Examples and Comparative Examples. However, these examples are intended to explain the present invention in more detail, and it will be obvious that the scope of the present invention is not limited to these examples.

[Example]

Example 1: Anti-shattering film

As a substrate layer, a polyethylene phthalate (PET) substrate film (thickness: 50 um, XG7PS8, Toray Advanced Materials) coated with a primer layer of about 1 um thickness was prepared on both sides. Separately, 100 parts by weight of UV acrylic resin binder (LCH-2243, TOYOINK), 25 parts by weight of a mixed solvent of methyl ethyl ketone (MEK) and propylene glycol monomethyl ether acetate mixed in a ratio of 2:8, Zion pigment (Thermochromic Micro Capsule -Color40, NANO I&C) 10 parts by weight and dispersant (BYK-104S, BYK) 1 part by weight were added and mixed to prepare a Zion pigment dispersion.

The Zion pigment dispersion was applied on the PET base film to a thickness of 10 μm. The coated zion pigment dispersion was cured by irradiation of 300 mJ/cm ² light by a UV lamp to form a first color layer. An adhesive layer was formed by coating an optically transparent adhesive (OCA, T _g : -5 ° C, OC-3000, SAIDEN) to a thickness of 25 um on the first color layer. A shatterproof film was prepared as shown in FIG. 3 by laminating a polyethylene terephthalate (PET) release film (RPKQ21, Toray Advanced Materials) with a thickness of 125 um on the adhesive layer.

Comparative Example 1: Anti-shattering film

An anti-scattering film was prepared in the same manner as in Example 1, except that the first color layer was formed by applying it on a PET base film to a thickness of 4 μm.

Comparative Example 2: Shatterproof Film

An anti-scattering film was manufactured in the same manner as in Example 1, except that the first color layer was formed by applying it on a PET base film to a thickness of 16 μm.

Comparative Example 3: Shatterproof Film

Scattering prevention in the same manner as in Example 1, except that an adhesive layer was formed by coating an optically transparent adhesive (OCA, T _g : -5 ° C, OC-3000, SAIDEN) on the first color layer to a thickness of 14 um film was made.

Comparative Example 4: Shatterproof Film

Scattering prevention in the same manner as in Example 1, except that an adhesive layer was formed by coating an optically transparent adhesive (OCA, T _g : -5 ℃, OC-3000, SAIDEN) on the first color layer to a thickness of 51 um film was made.

Comparative Example 5: Shatterproof Film

Anti-shattering film in the same manner as in Example 1, except that an adhesive layer was formed by coating an optically transparent adhesive (OCA, T _g : 1 ℃, OC-3000, SAIDEN) on the first color layer to a thickness of 25 um. was produced.

Comparative Example 6: Shatterproof Film

Scattering prevention in the same manner as in Example 1, except that an adhesive layer was formed by coating an optically transparent adhesive (OCA, T _g : -16 ° C, OC-3000, SAIDEN) on the first color layer to a thickness of 25 um film was made.

Evaluation Example 1: Evaluation of physical properties

The physical properties of the anti-shattering films prepared in Example 1 and Comparative Examples 1 to 6 were evaluated in the following manner, and the results are shown in Table 2 and FIGS. 5 to 6.

(1) Measurement of thickness (㎛)

The thicknesses of the base film, primer layer, first color layer, adhesive layer, and release film used in the anti-scattering films prepared in Example 1 and Comparative Examples 1 to 6 were measured using a Nikon MS-11C Micrometer, respectively. .

(2) Measurement of adhesion to glass (N/inch)

For each of the anti-scattering films prepared in Example 1 and Comparative Examples 1 to 6, the release film was peeled off and attached to glass, and then peeled at a speed of 0.3 m/min and at 180 degrees using a Cheminstrument AR-1000 to measure the adhesive strength. .

(3) Color visibility, bubble removal, orange peel, and adhesive transfer at room temperature and 40 ° C

For each of the anti-shattering films prepared in Example 1 and Comparative Examples 1 to 6, the release film was peeled off and attached to glass, and then color visibility at room temperature and 40 ° C., bubble removal, orange peel, and adhesive transfer were visually confirmed, respectively. 5 and 6 show pictures of color visibility at room temperature and 40 °C.

Color visibility at room temperature, 40℃ adhesiveness
(N/inch) remove air bubbles orange peel
(orange peel) adhesive transfer Example 1 ◎ 22 OK OK OK Comparative Example 1 X 22 OK OK OK Comparative Example 2 ◎ 24 OK OK NG Comparative Example 3 ◎ 14 OK OK OK Comparative Example 4 ◎ 32 OK OK NG Comparative Example 5 ◎ 24 NG OK OK Comparative Example 6 ◎ 18 OK NG OK

<Judgment Criteria>

◎: Good color visibility at room temperature and 40 ° C.

X: Poor color visibility at room temperature and 40°C

OK: good bubble removal, no orange peel, no adhesive transfer

NG: Poor bubble removal, orange peel, adhesive transfer

Referring to Table 2 and FIGS. 5 and 6, the anti-shattering film prepared in Example 1 has excellent color visibility at room temperature and 40 ° C., high adhesion to glass, and excellent bubble removal, and orange peel and adhesive transition. It can be confirmed that there is no From this, it can be seen that the anti-shattering film prepared by Example 1 is suitable for application as a decoration film for a smartphone back cover.

In comparison, the anti-scattering film prepared by Comparative Example 1 including the thin first color layer could not visually distinguish color change at room temperature and 40 ° C. In the anti-shattering film prepared by Comparative Example 2 including the thick first color layer, it was confirmed that the adhesive was transferred to the glass when measuring the adhesion to glass (N/inch). The anti-shattering film prepared by Comparative Example 3 including the thin adhesive layer had low adhesive strength to glass. In the anti-shattering film prepared in Comparative Example 4 including the thick adhesive layer, orange peel and adhesive transfer occurred. After the anti-shattering film produced in Comparative Example 5 including the adhesive layer having a high glass transition temperature was attached to the glass, air bubbles did not escape. In the anti-shattering film prepared by Comparative Example 6 including the adhesive layer having a low glass transition temperature, the adhesive became soft, resulting in orange peel and adhesive transition.

1. 11, 21, 31: base layer, 2, 12, 22, 32: first color layer
3, 13, 23, 34: adhesive layer, 4, 14, 24, 35: release film
25: primer layer, 33: second color layer
10, 20, 30, 40: anti-shattering film

Claims (13)

base layer;
a first color layer containing a reversible pigment; and
Including an adhesive layer; in this order,
The reversible pigment is a pigment whose color changes with temperature,
The thickness of the first color layer is 5 to 13㎛, anti-shattering film. According to claim 1,
The reversible pigment is a shatterproof film comprising a Zion pigment that changes to a transparent color at 40 ° C or higher. delete According to claim 1,
The thickness of the adhesive layer is 15 to 50 ㎛, anti-shattering film. According to claim 1,
The glass transition temperature (T _g ) of the adhesive layer is -15 to 0 ℃, the shatterproof film. According to claim 1,
The adhesive force of the adhesive layer to the glass is 15 N / inch or more, the shatterproof film. According to claim 1,
Further comprising a primer layer between the base layer and the first color layer, anti-shattering film. According to claim 7,
The thickness of the primer layer is 0.1 to 3 ㎛, shatterproof film. According to claim 1,
Further comprising a second color layer on the first color layer, anti-shattering film. According to claim 9,
The thickness of the second color layer is 2 to 10 ㎛, anti-shattering film. According to claim 1,
Further comprising a release film on the adhesive layer, anti-shattering film. An electronic display comprising the anti-shattering film according to any one of claims 1, 2, and 4 to 11. An electronic device comprising an electronic display according to claim 12 .

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