JP2021096953A - Lighting device, movable body, laminate film, and method for constructing laminate film - Google Patents

Abstract

To provide a laminate film that can readily add and remove a snow accretion prevention function to and from a lighting device which is mounted to an outer peripheral part of a movable body, and to provide a lighting device using the same, a movable body and a method for constructing a laminate film.SOLUTION: A lighting device includes: a light source; a cover disposed at a front surface of the light source and having transparency; and a laminate film affixed at a front surface of the cover and having transparency, and is installed in an outer peripheral part of a movable body. The laminate film 10 includes: a pressure-sensitive adhesion layer 13 and a snow accretion prevention layer 12 in this order from a cover side. The pressure-sensitive adhesion layer has adhesive force capable of detaching the laminate film from the cover.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a laminated film having a snow accretion prevention layer, a lighting device and a moving body using the laminated film, and a method of constructing the laminated film.

Conventionally, lighting devices such as headlights and taillights mounted on the outer periphery of a moving body such as an automobile or a railroad vehicle do not impair the lighting function due to the adhesion of snow or ice when used in a snowy area. Measures have been taken.

By the way, in recent years, HID lamps, LEDs and the like have become widespread as light sources in the above-mentioned lighting devices. Compared to conventional halogen lamps, HID lamps and LEDs can not only significantly reduce power consumption while improving visibility with high brightness, but also can reduce the amount of heat generated during lighting and have a long life. And has excellent durability. On the other hand, HID lamps and LEDs generate less heat when lit and dissipate less heat from the light source than conventional halogen lamps. Therefore, when snow or ice adheres to the lighting device, snow or ice Is hard to melt and easy to adhere. Therefore, measures to prevent snow accretion are important.

Examples of the snow accretion prevention technique include a method of providing a heater on the cover of the lighting device (see, for example, Patent Documents 1 and 2) and a method of applying a coating agent for preventing snow accretion on the cover of the lighting device (for example, Patent Documents). 3) is known.

Japanese Unexamined Patent Publication No. 2018-100011 Japanese Unexamined Patent Publication No. 2008-177054 JP-A-2018-0441553

However, when a lighting device equipped with a heater as described in Patent Document 1, for example, is adopted as a standard specification of a moving body, it is also installed in a product sold to a customer who is not expected to be used in a snowfall area. Therefore, the cost increases. Further, it is conceivable to replace the lighting device of the moving body with a lighting device provided with a heater, if necessary, but the replacement of the lighting device is costly and troublesome.

Further, Patent Document 2 describes a cover housing which is a lens cover of a vehicle lamp that can be attached to a vehicle lamp and which can be retrofitted by covering the outer lens of the vehicle lamp, and wiring on the inner surface of the cover housing. A lens cover for a vehicle lamp equipped with a resistance heating element for a heater has been proposed. According to such a lens cover, a lamp having no antifreeze function can be easily converted into a lamp with an antifreeze function. It is said that it can be changed. However, it is necessary to connect the resistance heating element of the lens cover to the power supply on the vehicle body side via the control circuit, and if the seal packing is damaged, rainwater may enter, so it is troublesome to attach the lens cover. Requires skill. Further, when the moving body includes a plurality of vehicle lighting fixtures, it is necessary to prepare a lens cover according to the size and shape of each vehicle lighting fixture, which is costly.

Further, in the case of the method of applying the coating agent to the cover of the lighting device as described in Patent Document 3, for example, the adhesive force of the coating film is weak, so that the durability may be inferior. In addition, in the case of this method, coating is difficult depending on the arrangement of the lighting device, uneven coating, unapplied coating, dripping occurs, it takes time to dry the coating film, and if uneven coating occurs, the snow accretion prevention effect is reduced. There are problems such as

The present disclosure has been made in view of the above circumstances, and uses a laminated film capable of easily imparting and removing a snow accretion prevention function to a lighting device mounted on an outer peripheral portion of a moving body. The main purpose is to provide a method of constructing a lighting device and a moving body, and a laminated film.

One embodiment of the present disclosure includes a light source, a cover arranged in front of the light source and having transparency, and a laminated film arranged in front of the cover and having transparency, and has an outer periphery of a moving body. A lighting device installed in a unit, the laminated film has a pressure-sensitive adhesive layer and a snow-prevention layer in this order from the cover side, and the pressure-sensitive adhesive layer is the same as the laminated film. Provided is a lighting device having an adhesive force that can be peeled off from a cover.

In the present disclosure, the surface of the snow accretion prevention layer preferably has a contact angle with water of 90 ° or more.

Further, in the present disclosure, it is preferable that the laminated film has a base material layer between the pressure-sensitive adhesive layer and the snow accretion prevention layer.

Further, in the present disclosure, the snow accretion prevention layer preferably contains a cured product of an ionizing radiation curable resin composition containing a water repellent additive. In this case, the ionizing radiation curable resin composition is preferably an electron beam curable resin composition. In this case, the water-repellent additive is preferably a silicone compound.

Another embodiment of the present disclosure provides a mobile body comprising the above-mentioned lighting device on an outer peripheral portion.

Another embodiment of the present disclosure has a pressure-sensitive adhesive layer and a snow accretion prevention layer in this order, and the pressure-sensitive adhesive layer has an adhesive force that enables peeling after being attached to an adherend. However, a laminated film having transparency is provided.

Another embodiment of the present disclosure provides a method for constructing a laminated film, which comprises a step of attaching the above-mentioned laminated film to a cover of a lighting device installed on an outer peripheral portion of a moving body.

In the present disclosure, it is possible to easily add and remove the snow accretion prevention function to the lighting device mounted on the outer peripheral portion of the moving body.

It is a schematic diagram which illustrates the moving body in this disclosure. It is schematic cross-sectional view which illustrates the lighting apparatus in this disclosure. It is a partially enlarged view of FIG. It is a partially enlarged view of FIG. It is a schematic plan view which illustrates the lighting apparatus in this disclosure. It is the schematic cross-sectional view which illustrates the laminated film in this disclosure. It is the schematic cross-sectional view which illustrates the laminated film in this disclosure. It is the schematic cross-sectional view which illustrates the laminated film in this disclosure. It is the schematic cross-sectional view which illustrates the laminated film in this disclosure.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings and the like. However, the present disclosure can be implemented in many different embodiments and is not construed as limited to the description of the embodiments illustrated below. In addition, in order to clarify the explanation, the drawings may schematically represent the width, thickness, shape, etc. of each part as compared with the actual form, but this is just an example and the interpretation of the present disclosure is limited. It's not something to do. Further, in the present specification and each figure, the same elements as those described above with respect to the above-mentioned figures may be designated by the same reference numerals, and detailed description thereof may be omitted as appropriate.

In the present specification, when expressing the mode of arranging another member on a certain member, when simply expressing "above" or "below", unless otherwise specified, the member is in contact with the certain member. Including the case where another member is arranged directly above or directly below, and the case where another member is arranged above or below a certain member via another member. Further, in the present specification, when expressing the mode of arranging another member on the surface of a certain member, when simply expressing "on the surface", unless otherwise specified, directly above the member so as to be in contact with the certain member. Alternatively, it includes both a case where another member is arranged directly below and a case where another member is arranged above or below a certain member via another member.

Further, in the present specification, terms such as "film", "sheet", and "board" are not distinguished from each other based only on the difference in designation. For example, "laminated film" is a concept that includes members that can also be called sheets, boards, and the like.

Hereinafter, the lighting device, the moving body, the laminated film, and the method of constructing the laminated film in the present disclosure will be described in detail.

A. Lighting device The lighting device in the present disclosure includes a light source, a cover arranged in front of the light source and having transparency, and a laminated film arranged in front of the cover and having transparency, and is of a moving body. A lighting device installed on an outer peripheral portion, the laminated film has a pressure-sensitive adhesive layer and a snowfall prevention layer in this order from the cover side, and the pressure-sensitive adhesive layer includes the laminated film. It has an adhesive force that can be peeled off from the cover.

FIG. 1 is a schematic view showing an example of a moving body in the present disclosure, in which the moving body is an automobile and the lighting device is a headlight. FIG. 2 is a schematic cross-sectional view showing an example of the lighting device in the present disclosure, and FIG. 3 is a partially enlarged view of FIG. As shown in FIG. 1, the lighting device 1 is installed on the outer peripheral portion of the automobile 100. Further, as shown in FIG. 2, the lighting device 1 is arranged in front of the light source 2, the housing 3, and the light source 2, and is arranged in front of the transparent cover 4 and the cover 4 to provide transparency. It has the laminated film 10 and the laminated film 10. As shown in FIG. 3, the laminated film 10 has a pressure-sensitive adhesive layer 13, a base material layer 11, and a snow accretion prevention layer 12 in this order from the cover 4 side, and the pressure-sensitive adhesive layer 13 is provided. It is attached to the cover 4 via the cover 4. The pressure-sensitive adhesive layer 13 has an adhesive force that allows the laminated film 10 to be peeled off from the cover 4.

In the example shown in FIG. 3, the laminated film 10 has a base material layer 11 between the pressure-sensitive adhesive layer 13 and the snow accretion prevention layer 12, but as shown in FIG. 4, the laminated film 10 is It may have a pressure-sensitive adhesive layer 13 and a snow accretion prevention layer 12.

In the present disclosure, the laminated film has a snow accretion prevention layer and a pressure-sensitive adhesive layer, and can be attached to the cover of the lighting device of the moving body via the pressure-sensitive adhesive layer. A snow accretion prevention function can be easily added to the device. Further, since the pressure-sensitive adhesive layer has an adhesive force that allows the laminated film to be peeled off from the cover and can be peeled off again from the cover, the laminated film can be easily peeled off from the cover of the moving lighting device. Can be peeled off. Therefore, by attaching and peeling the laminated film, it is possible to easily add and remove the snow accretion prevention function to the lighting device of the moving body. Therefore, for example, in winter when the snow accretion prevention function is required, a laminated film is attached to the cover of the lighting device of the moving body, and in spring, summer, and autumn when the snow accretion prevention function is not required, the moving body is attached. The laminated film can also be peeled off from the cover of the luminaire.

Further, the laminated film in the present disclosure can be easily attached to the cover of the lighting device of a moving body, and can be cut into an arbitrary size and shape according to the size and shape of the cover of the lighting device. It can be easily applied to various lighting devices. Therefore, it is possible to more easily add the snow accretion prevention function to the lighting device of the moving body.

Further, since the laminated film in the present disclosure is in the form of a film, it is easy to handle, and coating is difficult depending on the arrangement of the lighting device of the moving body as in the case of the conventional method of applying a coating agent. It is possible to suppress the occurrence of problems such as uneven coating, unapplied coating, dripping, taking time to dry the coating film, and reducing the snow accretion prevention effect when uneven coating occurs.

Hereinafter, each configuration of the lighting device in the present disclosure will be described.

1. 1. Laminated film The laminated film in the present disclosure is a transparent member arranged on the front surface of a cover. The laminated film has a pressure-sensitive adhesive layer and a snow accretion prevention layer in this order from the cover side.

Here, "transparency" refers to the transparency required for the cover of the lighting device of a moving body.

Hereinafter, each configuration of the laminated film will be described.

(1) Snow accretion prevention layer The snow accretion prevention layer in the present disclosure is a layer having transparency and a snow accretion prevention function.

(A) Characteristics of the snow accretion prevention layer The snow accretion prevention function of the snow accretion prevention layer can be evaluated by, for example, wettability, and specifically, the snow accretion prevention layer preferably has water repellency. More specifically, the snow accretion prevention function of the snow accretion prevention layer can be evaluated by the contact angle with water. The contact angle of the surface of the snow accretion prevention layer with water is, for example, preferably 90 ° or more, more preferably 95 ° or more, and further preferably 100 ° or more. When the contact angle is within the above range, the snow accretion prevention layer can exhibit a good snow accretion prevention function. On the other hand, the contact angle of the surface of the snow accretion prevention layer with water is usually 120 ° or less, and may be 110 ° or less.

Further, in the snow accretion prevention layer, the contact angle of the surface of the snow accretion prevention layer with water after the following weather resistance test is preferably, for example, 85 ° or more, more preferably 90 ° or more, and 95 ° More preferably, it is greater than or equal to °. When the contact angle is within the above range, the snow accretion prevention layer can exhibit a good snow accretion prevention function for a long period of time. On the other hand, the contact angle of the surface of the snow accretion prevention layer with water after the weather resistance test is usually 105 ° or less.

The weather resistance test is carried out in accordance with JIS K 5600-7-7. Specifically, using an Atlas weather meter Ci5000 manufactured by Toyo Seiki Seisakusho Co., Ltd., using a xenon arc lamp as a light source, the average irradiance of the light that hits the test piece is 60 W / m ² (wavelength 300 nm to 400 nm), and the black panel temperature. Is set to 63 ± 3 ° C. The 1500 cycle (3000 hours) test is performed with 120 minutes of 102-minute irradiation only, 102-minute irradiation, 18-minute irradiation, and shower as one cycle.

The contact angle of the snow accretion prevention layer with water is a value measured by the θ / 2 method. For example, 1.0 μL of pure water is dropped on the snow accretion prevention layer, and 10 seconds after the drop is applied. It can be obtained by measuring the contact angle. As the measuring device, for example, a contact angle meter DMs-401 manufactured by Kyowa Interface Science Co., Ltd. can be used.

As for the transparency of the snow accretion prevention layer, for example, the total light transmittance is preferably 80% or more, more preferably 85% or more, and further preferably 90% or more. When the total light transmittance of the snow accretion prevention layer is within the above range, a laminated film having good transparency can be obtained.

The total light transmittance can be measured according to JIS K7361-1. The same applies to the method for measuring the total light transmittance of other members, which will be described later.

Further, as the transparency of the snow accretion prevention layer, for example, the haze is preferably 2.0 or less, more preferably 1.5 or less, and further preferably 1.0 or less. If the haze of the snow accretion prevention layer is within the above range, a laminated film having good transparency can be obtained.

The haze can be measured in accordance with JIS K7136. The same applies to the method for measuring the haze of other members, which will be described later.

Further, the snow accretion prevention layer preferably has chemical resistance. Specifically, the snow accretion prevention layer preferably has acid resistance and alkali resistance. Further, the snow accretion prevention layer preferably has resistance to a cleaning liquid used when cleaning a moving body. When the snow accretion prevention layer has such chemical resistance, it is possible to suppress deterioration of the snow accretion prevention function due to cleaning of the moving body. In addition, the snow accretion prevention layer preferably has resistance to gasoline.

(B) Material of snow accretion prevention layer The material of the snow accretion prevention layer is not particularly limited as long as it can obtain the snow accretion prevention layer having the above-mentioned snow accretion prevention function, transparency and chemical resistance.

The snow accretion prevention layer preferably contains a cured product of the curable resin composition. Examples of the curable resin composition include an ionizing radiation curable resin composition, a thermosetting resin composition, a room temperature curable resin composition, a one-component reaction-curable resin composition, a two-component reaction-curable resin composition, and the like. Can be mentioned. Of these, an ionizing radiation curable resin composition is preferable. This is because a snow accretion prevention layer having excellent scratch resistance, scratch resistance, weather resistance and the like can be obtained.

In addition, ionizing radiation means electromagnetic waves or charged particles having energy capable of polymerizing or cross-linking molecules, and for example, all ultraviolet rays (UV-A, UV-B, UV-C), visible rays, gamma rays, and the like. Examples include X-rays and electron beams (EB).

Examples of the ionizing radiation curable resin composition include an ultraviolet curable resin composition and an electron beam curable resin composition. Of these, an electron beam curable resin composition is preferable. This is because the hardness of the snow accretion prevention layer can be increased, and scratch resistance, scratch resistance, abrasion resistance, and the like can be improved. As a result, it is possible to suppress a decrease in transparency and a decrease in the snow accretion prevention function due to scratches. Further, the electron beam curable resin composition does not need to use a polymerization initiator and usually does not contain a polymerization initiator. Therefore, when the electron beam curable resin composition contains a weathering agent as described later, the content of the weathering agent can be relatively increased. Therefore, the weather resistance of the snow accretion prevention layer can be improved. Further, as will be described later, when the snowfall prevention layer contains an ultraviolet absorber, the electron beam curable resin composition is insufficiently cured by the action of the ultraviolet absorber. Can be avoided.

(I) Ionizing Radiation Curable Resin Component The ionizing radiation curable resin composition contains an ionizing radiation curable resin component. Examples of the ionizing radiation curable resin component include monomers, oligomers, prepolymers and the like having a polymerizable functional group in the molecule. Examples of the polymerizable functional group include an ethylenically unsaturated bond such as a (meth) acryloyl group, a vinyl group and an allyl group, and an epoxy group.

Examples of the above-mentioned monomers, oligomers, and prepolymers include (meth) acrylates having a polymerizable functional group in the molecule, and specifically, monofunctional (meth) acrylates and polyfunctional (meth) acrylates. Can be mentioned. Of these, polyfunctional (meth) acrylate is preferable. The polyfunctional (meth) acrylate is a (meth) acrylate having two or more polymerizable functional groups in the molecule.

The number of functional groups of the polyfunctional (meth) acrylate is not particularly limited, and can be, for example, 2 or more and 50 or less, preferably 2 or more and 8 or less, and more preferably 2 or more and 6 or less.

Specific examples of the polyfunctional (meth) acrylate include urethane (meth) acrylate, caprolactone-modified urethane (meth) acrylate, (meth) acrylate having an alicyclic or aliphatic heterocycle, polycarbonate (meth) acrylate, and penta. Examples thereof include erythritol-based (meth) acrylate, epoxy (meth) acrylate, polyester (meth) acrylate, polyether (meth) acrylate, polybutadiene (meth) acrylate, silicone (meth) acrylate, and aminoplast resin (meth) acrylate.

Here, the urethane (meth) acrylate can be obtained, for example, by esterifying a polyurethane oligomer obtained by reacting a polyol such as a polyether polyol, a polyester polyol, or a polycarbonate polyol with a polyisocyanate with (meth) acrylic acid. it can. The caprolactone-modified urethane (meth) acrylate can be obtained, for example, by reacting a caprolactone-modified polyol with a polyisocyanate and a hydroxy (meth) acrylate. Polycarbonate (meth) acrylate can be obtained, for example, by esterifying some or all of the hydroxyl groups of the polycarbonate polyol with (meth) acrylic acid. The pentaerythritol-based (meth) acrylate can be obtained, for example, by esterifying a part or all of the hydroxyl groups of pentaerythritol or a polymer thereof with (meth) acrylic acid. Epoxy (meth) acrylate can be obtained, for example, by reacting (meth) acrylic acid with the oxylan ring of a relatively low molecular weight bisphenol type epoxy resin or novolak type epoxy resin to esterify it. Further, a carboxyl-modified epoxy (meth) acrylate in which this epoxy (meth) acrylate is partially modified with a dibasic carboxylic acid anhydride can also be used. Polyester (meth) acrylate can be obtained, for example, by esterifying the hydroxyl groups of a polyester oligomer having hydroxyl groups at both ends obtained by condensation of a polyvalent carboxylic acid and a polyhydric alcohol with (meth) acrylic acid, or to a polyvalent carboxylic acid. It can be obtained by esterifying the hydroxyl group at the end of the oligomer obtained by adding an alkylene oxide with (meth) acrylic acid. The polyether (meth) acrylate can be obtained by esterifying the hydroxyl group of the polyether polyol with (meth) acrylic acid. Polybutadiene (meth) acrylate can be obtained by adding (meth) acrylate acid to the side chain of the polybutadiene oligomer. Silicone (meth) acrylate can be obtained by modifying silicone having a polysiloxane bond in the main chain with (meth) acrylic acid. Aminoplast resin (meth) acrylate can be obtained by modifying an aminoplast resin having many reactive groups in a small molecule with (meth) acrylic acid.

These polyfunctional (meth) acrylates may be used alone or in combination of two or more.

Hereinafter, preferred embodiments of the ionizing radiation curable resin component will be described.

(I-1) Preferred Aspect 1
Among the above-mentioned polyfunctional (meth) acrylates, a combination of a trifunctional or higher functional (meth) acrylate and a bifunctional (meth) acrylate is preferably mentioned from the viewpoint of weather resistance and abrasion resistance.

When a trifunctional or higher functional (meth) acrylate and a bifunctional (meth) acrylate are used in combination, the ratio thereof may be appropriately set according to the type of each (meth) acrylate to be combined, for example, 3 1 part by mass or more and 150 parts by mass or less of bifunctional (meth) acrylate, preferably 5 parts by mass or more and 120 parts by mass or less, and more preferably 10 parts by mass or more and 100 parts by mass with respect to 100 parts by mass of functional or higher (meth) acrylate. It can be less than or equal to parts by mass.

Examples of the trifunctional or higher functional (meth) acrylate include urethane (meth) acrylate, caprolactone-modified urethane (meth) acrylate, polycarbonate (meth) acrylate, pentaerythritol-based (meth) acrylate, epoxy (meth) acrylate, and polyester (meth). ) Acrylate, polyether (meth) acrylate, polybutadiene (meth) acrylate, silicone (meth) acrylate, aminoplast resin (meth) acrylate and the like can be mentioned. These trifunctional or higher functional (meth) acrylates may be used alone or in combination of two or more.

The number of functional groups of the trifunctional or higher functional (meth) acrylate is not particularly limited, but from the viewpoint of weather resistance, abrasion resistance, etc., for example, 3 or more and 50 or less, preferably 3 or more and 8 or less, more preferably 4 or more and 6 or less. Can be.

The average molecular weight of the trifunctional or higher functional (meth) acrylate varies depending on the type, but can be, for example, 200 or more and 100,000 or less, preferably 500 or more and 50,000 or less, and more preferably 1000 or more and 30,000 or less. Here, the average molecular weight of the trifunctional or higher functional (meth) acrylate indicates the weight average molecular weight measured by GPC analysis and converted with standard polystyrene.

Among these trifunctional or higher functional (meth) acrylates, from the viewpoint of weather resistance and abrasion resistance, urethane (meth) acrylate is preferable, and urethane (meth) having a skeleton such as polyether, polyester, or polycarbonate is more preferable. Acrylate can be mentioned.

As the bifunctional (meth) acrylate, a bifunctional (meth) acrylate may be appropriately selected from the above-mentioned (meth) acrylates.

Preferable examples of the bifunctional (meth) acrylate include caprolactone-modified urethane acrylate from the viewpoint of weather resistance and wear resistance.

The bifunctional caprolactone-modified urethane (meth) acrylate can be obtained by reacting the caprolactone-modified diol with the polyisocyanate and the hydroxy (meth) acrylate.

The caprolactone-modified diol preferably has two hydroxyl groups and has a weight average molecular weight of preferably 500 or more and 3000 or less, and more preferably 750 or more and 2000 or less. Further, diols other than caprolactone-modified diols, for example, diols such as ethylene glycol, diethylene glycol, 1,4-butanediol, and 1,6-hexanediol can be used by mixing one or more diols in an arbitrary ratio. ..

As the polyisocyanate, a diisocyanate having two isocyanate groups is preferable, and isophorone diisocyanate, hexamethylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, trimethylhexamethylene diisocyanate and the like are preferably mentioned from the viewpoint of suppressing yellowing. Further, as the hydroxy (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, caprolactone-modified -2-hydroxyethyl (meth) acrylate and the like are preferably mentioned.

The bifunctional caprolactone-modified urethane (meth) acrylate can be synthesized by reacting these polycaprolactone-based diols with polyisocyanate and hydroxy (meth) acrylate. As a synthetic method, a polycaprolactone-modified diol is reacted with a polyisocyanate to form a polyurethane prepolymer containing a −NCO group (isocyanate group) at both ends, and then reacted with a hydroxy (meth) acrylate. The method of causing is preferable. The reaction conditions and the like may be in accordance with a conventional method.

The average molecular weight of the bifunctional caprolactone-modified urethane (meth) acrylate can be, for example, 1000 or more and 12000 or less, preferably 1000 or more and 10000 or less. Here, the average molecular weight of the bifunctional (meth) acrylate indicates the weight average molecular weight measured by GPC analysis and converted with standard polystyrene.

In addition, in this specification, (meth) acryloyl represents acryloyl and / or meta-acryloyl, and (meth) acrylate represents acrylate and / or methacrylate.

(I-2) Preferred Aspect 2
As the ionizing radiation curable resin component, a urethane compound which is a reaction product of the compound (a1) represented by the following general formula (1) and the isocyanate (a2) having an isocyanurate ring represented by the following general formula (2) ( A combination of A) and the compound (B) having an isocyanurate ring represented by the following general formula (3) is also preferable.

（式中、Ｚ^１は、重合性炭素−炭素二重結合含有基である。Ｒ^１は、酸素原子を含んでもよい２価の炭化水素基である。Ｒ^２は、水素原子又は１価の炭化水素基である。Ｒ^３は、単結合又は２価の炭化水素基である。ｎは１〜３の整数であり、ｍは１〜３の整数であり、ｎ＋ｍは２〜４を満たす数である。ｎが２以上のとき、２つ以上のＺ^１及びＲ^１は同一であっても異なってもよい。ｍが２以上のとき、２つ以上のＲ^３は同一であっても異なってもよい。４−ｎ−ｍが２のとき、２つのＲ^２は同一であっても異なってもよい。）

(In the formula, Z ¹ is a polymerizable carbon-carbon double bond-containing group. R ¹ is a divalent hydrocarbon group that may contain an oxygen atom. R ² is a hydrogen atom or a monovalent group. It is a hydrocarbon group. R ³ is a single bond or divalent hydrocarbon group. N is an integer of 1 to 3, m is an integer of 1 to 3, and n + m is a number satisfying 2 to 4. When n is 2 or more, two or more Z ¹ and R ¹ may be the same or different. When m is 2 or more, two or more R ³ may be the same or different. when it may be .4-n-m is 2, the two R ² may be the same or different.)

（式中、Ｒ^４はそれぞれ独立に、同一又は異種の、酸素原子を含んでもよい２価の炭化水素基である。）

(In the formula, R ⁴ is a divalent hydrocarbon group that may contain an oxygen atom, which is the same or different from each other, independently of each other.)

（式中、Ｚ^２はそれぞれ独立に、同一又は異種の、重合性炭素−炭素二重結合含有基である。Ｒ^５はそれぞれ独立に、同一又は異種の、酸素原子を含んでもよい２価の炭化水素基である。）

(In the formula, Z ² is an independently identical or heterogeneous polymerizable carbon-carbon double bond-containing group. R ⁵ is a divalent group which may independently contain the same or dissimilar oxygen atoms. It is a hydrocarbon group.)

When the ionizing radiation curable resin composition contains the urethane compound (A) and the compound (B) having the above-mentioned isocyanurate ring, the intermolecular cohesive force can be improved. Furthermore, hydrophobicity can be imparted by the group between the isocyanurate ring and the polymerizable carbon-carbon double bond-containing group. Therefore, excellent extensibility and chemical resistance can be imparted to the snow accretion prevention layer.

(A) Urethane compound (A)
The urethane compound (A) is a reaction product of the compound (a1) represented by the general formula (1) and the isocyanate (a2) having an isocyanurate ring represented by the general formula (2).

(A-1) Compound (a1) represented by the general formula (1)
In the compound (a1) represented by the general formula (1), Z ¹ is a polymerizable carbon-carbon double bond-containing group. The polymerizable carbon-carbon double bond-containing group is not particularly limited as long as it contains a polymerizable carbon-carbon double bond, and is, for example, a vinyl group, a (meth) acryloyl group, or a (meth) acryloyloxy. Examples include a group and an allyl group. n is 2 or more (i.e., 2 or 3) when two or three of Z ¹ may be the same as or different from each other or different.

R ¹ is a divalent hydrocarbon group that may contain an oxygen atom, for example, a linear, branched, or cyclic divalent aliphatic hydrocarbon group having 1 to 3 carbon atoms, or the aliphatic. Examples thereof include groups containing one or more ether bonds, ester bonds, carbonyl groups, etc. between the carbon-carbon bonds of the hydrocarbon groups. A linear alkylene group having 1 to 3 carbon atoms is preferable, and a methylene group, an ethylene group, and a propylene group are particularly preferable. n is 2 or more (i.e., 2 or 3) when the two or three R ¹ may be the same as or different from each other or different.

R ² is a hydrogen atom or a monovalent hydrocarbon group, preferably a hydrogen atom or a linear, branched or cyclic alkyl group having 1 to 3 carbon atoms, and particularly preferably a hydrogen atom or a hydrogen atom or a cyclic alkyl group. It is a methyl group. When 4-n-m is 2, the two R ² may be respectively the same as or different from each other or different.

R ³ is a single bond or divalent hydrocarbon group, preferably a single bond or a linear, branched or cyclic alkylene group having 1-3 carbon atoms, particularly preferably a single bond or a single bond or a cyclic alkylene group. It is a methylene group. m is 2 or more (i.e., 2 or 3) when the two or three R ³ may be the same as or different from each other or different.

n is an integer of 1 to 3, m is an integer of 1 to 3, and n + m is a number satisfying 2 to 4. That is, the combination of n and m is (n, m) = (1, 1), (1, 2), (2, 1), (3, 1), (2, 2) or (1, 3). Is.

As the compound (a1), pentaerythritol is modified with (meth) acrylic, that is, one, two, or three hydroxyl groups of the four hydroxy groups contained in pentaerythritol are (meth) acrylic acid. It is preferable that it has reacted with. One hydroxy group reacted with (meth) acrylic acid is pentaerythritol monoacrylate, n = 1, m = 3, Z ¹ = (meth) acryloyloxy group, R ¹ and R ³ are methylene groups. .. The reaction of two hydroxy groups with (meth) acrylic acid is pentaerythritol diacrylate, n = 2, m = 2, Z ¹ = (meth) acryloyloxy group, and R ¹ and R ³ are methylene groups. .. Pentaerythritol triacrylate (PETA) is obtained by reacting three hydroxy groups with (meth) acrylic acid, n = 3, m = 1, Z ¹ = (meth) acryloyloxy group, and R ¹ and R ³ are methylene. It is a group.

In particular, the compound (a1) is preferably composed mainly of pentaerythritol triacrylate (PETA) in which three hydroxyl groups in pentaerythritol are modified with (meth) acrylic acid. This is urethane, which is a reaction product when the amount ratio of pentaerythritol monoacrylate or pentaerythritol diacrylate is large, and when it reacts with isocyanate (a2) having an isocyanurate ring represented by the general formula (2) described later. The compound (A) may be polymerized, and the dispersibility between the urethane compound (A) which is a reactant and the compound (B) described later may be lowered, which may adversely affect various physical properties. Because there is.

Therefore, the main component of the compound (a1) is a compound in which n is 3, m is 1, Z ¹ is a (meth) acryloyloxy group, and R ¹ and R ³ are methylene groups in the above general formula (1). That is preferable.

Here, as described above, the main component includes pentaerythritol monoacrylate and pentaerythritol diacrylate to the extent that the urethane compound (A) is not polymerized and does not adversely affect various physical properties. It means that it is also good.

The above compound (a1) may be used alone or in combination of two or more.

Further, as the compound (a1), 2-hydroxypropyl acrylate (HPA) is also preferable. In this case, n = 1, m = 1, Z ¹ = (meth) acryloyloxy group, R ¹ and R ³ are methylene groups, and two R ² are hydrogen atoms and methyl groups.

(A-2) Isocyanate (a2) having an isocyanurate ring represented by the general formula (2).
In the general formula (2), R ⁴ is a divalent hydrocarbon group that may independently contain the same or different oxygen atoms.

The R ⁴ includes, for example, a linear, branched, or cyclic divalent aliphatic hydrocarbon group having 6 to 13 carbon atoms, one or more ether bonds, an ester bond, a carbonyl group, and the like. Examples thereof include divalent aliphatic hydrocarbon groups having 7 to 13 carbon atoms.

As described above, when R ⁴ is an isocyanate (a2) which is an aliphatic hydrocarbon group having a predetermined carbon number, hydrophobicity can be imparted to obtain a snow accretion prevention layer having excellent chemical resistance. be able to. Furthermore, since the mobility of the isocyanurate ring in the snow accretion prevention layer can be improved, it is presumed that the bond between the isocyanurate rings due to the intermolecular cohesive force can be improved.

Of these, an alkylene group having 6 to 8 carbon atoms is preferable, and a hexylene group and a cyclohexylene group are more preferable.

Such an isocyanate having an isocyanurate ring is derived from a diisocyanate having two isocyanate groups in the molecule. Examples of the diisocyanate include hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, dicyclohexylmethane-2,4'-diisocyanate, 2,4-tolylene diisocyanate, and 2,5-toluene diisocyanate. Examples thereof include diisocyanates such as 1,3-xylylene diisocyanate, 1,4-xylylene diisocyanate, diphenylmethane-4,4'-diisocyanate, 3-methyldiphenylmethane diisocyanate, and lysine diisocyanate. In particular, hexamethylene diisocyanate and isophorone diisocyanate are preferable.

(A-3) Others In the urethane compound (A), the compound (a1) represented by the general formula (1) and the isocyanate (a2) having an isocyanurate ring represented by the general formula (2) are urethaneized. It is a compound obtained by reacting. In particular, the compound (a1) in which n is 3, m is 1, Z ¹ is a (meth) acryloyloxy group, and R ¹ and R ³ are methylene groups in the above general formula (1), and the above general formula (2). R ⁴ is linear in the middle, branched, or is preferably a reaction product of an isocyanate (a2) a bivalent cyclic aliphatic hydrocarbon group.

The method for obtaining the urethane compound (A) is not particularly limited, and the urethane compound (A) can be produced according to a generally known method. For example, in the reaction vessel, the compound (a1) represented by the general formula (1) and the isocyanate (a2) having an isocyanurate ring represented by the general formula (2) are charged with a urethanization catalyst and polymerization, if necessary. A banning agent and an organic solvent are added, and the reaction is carried out while maintaining a predetermined temperature.

The reaction ratio of each component is such that the hydroxyl group contained in the compound (a1) represented by the general formula (1) and the isocyanate (a2) having an isocyanurate ring represented by the general formula (2) are equivalent. It is preferable to react with. Specifically, the reaction is usually carried out at an equivalent ratio of hydroxyl groups / isocyanate groups of 0.8 or more and 1.1 or less.

As for the isocyanate (a2) and the compound (a1), one of the raw materials may be added in advance, and then a raw material other than the previously added raw material may be added dropwise to cause the reaction. The urethanization reaction is usually carried out at 60 ° C. or higher and 120 ° C. or lower. The end point of the urethanization reaction ^{can be confirmed by the disappearance of the infrared absorption spectrum of 2270 cm-1} showing an isocyanate group and the determination of the isocyanate group content by the method described in JIS K 7301. As the urethanization catalyst, a tin compound such as dibutyltin dilaurate or an amine such as triethylamine can be used.

Regarding the molecular weight of the urethane compound (A), the weight average molecular weight is 1000 or more and 25,000 in that the dispersibility between the urethane compound (A) which is a reactant and the compound (B) described later is improved and uniform physical properties are obtained. The following is preferable.

Here, the weight average molecular weight (Mw) in the present specification is determined as a standard polystyrene-equivalent value by gel permeation chromatography (GPC). For example, a GPC HLC-8220 manufactured by Tosoh Corporation is used as a measuring device, Shodex LF-404 × 2 are connected in series to a column, a differential refractive index (RI) detector is used as a detector, and Agilent is used as standard polystyrene. Basic Type PS-2 polystyrene (molecular weight range 580 to 364,000) manufactured by Agilents can be used.

The content of the urethane compound (A) in the ionizing radiation curable resin composition is not particularly limited, but for example, 18 parts by mass or more and 60 parts by mass or less in 100 parts by mass of the solid content of the ionizing radiation curable resin composition. It can be preferably 36 parts by mass or more and 54 parts by mass or less.

When the urethane compound (A) is blended in the state of a mixture of the urethane compound (D) described later, the blending amount of the mixture of the urethane compound (A) and the urethane compound (D) described later is determined. For example, the solid content of the ionizing radiation curable resin composition can be 10 parts by mass or more and 90 parts by mass or less, preferably 20 parts by mass or more and 70 parts by mass or less, based on 100 parts by mass of the solid content.

(A) Compound having an isocyanurate ring (B)
Compound (B) is a compound having an isocyanurate ring represented by the above general formula (3). By containing the compound (B), the balance between the crosslink density of the cured product of the ionizing radiation curable resin composition and the density of the isocyanate ring can be improved, and the chemical resistance is improved without impairing the extensibility. Can be improved.

In the above general formula (3), Z ² is a polymerizable carbon-carbon double bond-containing group that is the same or different from each other independently. Examples of the polymerizable carbon-carbon double bond-containing group include the same groups as those exemplified by ^{Z 1 in the general formula (1).} In particular, from the viewpoint of polymerizable property, (meth) acryloyl group and (meth) acryloyloxy group are preferable.

R ⁵ is a divalent hydrocarbon group that may independently contain the same or different oxygen atoms. Of these, an alkylene group having 2 to 7 carbon atoms or a divalent aliphatic hydrocarbon group having 5 to 15 carbon atoms containing an ester group is preferable. By making it hydrophobic, the chemical resistance can be improved, and the mobility of the isocyanurate rings in the cured product of the ionizing radiation curable resin composition can be improved. Therefore, the molecules of the isocyanurate rings are linked to each other. This is because it is presumed that the binding due to the intermolecular cohesive force can be improved.

In particular at least one of three R ^5, but is preferably a compound which is a divalent aliphatic hydrocarbon group having 5 to 15 carbon atoms containing an ester group. In this case, the other R ⁵ is preferably a linear alkylene group having 2 to 7 carbon atoms.

At least one of the three R ⁵ but, as the compound is a divalent aliphatic hydrocarbon group having 5 to 15 carbon atoms containing an ester group, for example, a commercially available product can be used. Specific examples thereof include ε-caprolactone-modified tris- (2-acryloxyethyl) isocyanurate (NK ester A9300-1CL, NK ester A9300-3CL (manufactured by Shin Nakamura Chemical Industry Co., Ltd.)) represented by the following formula. Examples of the other compound (B) include tris- (2-acryloxyethyl) isocyanurate (NK ester A9300 (manufactured by Shin-Nakamura Chemical Industry Co., Ltd.)) which is not modified with ε-caprolactone and is represented by the following formula.

また、このような３つのＲ^５のうち少なくとも１つが、エステル基を含む炭素数５〜１５の２価の脂肪族炭化水素基である化合物は、ヒドロキシ基を有するイソシアヌル酸トリスヒドロキシアルキル（例えば、イソシアヌル酸トリスヒドロキシエチル）に、ε−カプロラクトンを付加し、さらにその後アクリル酸を付加するといった２段階で合成することができる。

Further, at least one of these three R ^5, compound a divalent aliphatic hydrocarbon group having 5 to 15 carbon atoms including ester groups, isocyanurate tris hydroxyalkyl having a hydroxy group (e.g., It can be synthesized in two steps, such as adding ε-caprolactone to trishydroxyethyl isocyanurate) and then adding acrylic acid.

The content of the compound (B) is not particularly limited, but is, for example, 36 parts by mass or more and 82 parts by mass or less, preferably 46 parts by mass or more and 72 parts by mass or less in 100 parts by mass of the solid content of the ionizing radiation curable resin composition. Can be.

(C) Other components When the ionizing radiation curable resin composition contains the above-mentioned urethane compound (A) and compound (B), the compound (a1) represented by the above general formula (1) and an isocyanurate structure are used. It is preferable that the urethane compound (D), which is a reaction product with an isocyanate having an alicyclic structure, is further contained. As described above, it is preferable to contain a urethanization reaction product different from the urethane compound (A) because it becomes a cured product having further excellent extensibility.

Examples of the isocyanate which does not contain an isocyanurate structure and has an alicyclic structure include isophorone diisocyanate (IPDI).

(Ii) Water-repellent additive The snow accretion prevention layer preferably contains a water-repellent additive. That is, the snow accretion prevention layer preferably contains a cured product of a curable resin composition containing a water-repellent additive. Examples of the water-repellent additive include silicone-based compounds and fluorine-based compounds. The water-repellent additive may be used alone or in combination of two or more.

Examples of the silicone-based compound include silicone-based surfactants and silicone oils.

Examples of the fluorine-based compound include a fluorine-based surfactant and a fluorine-based silane coupling agent.

Further, the silicone-based compound and the fluorine-based compound may have a reactive functional group. When the silicone compound and the fluorine compound have a reactive functional group, they can be fixed to the surface of the snow accretion prevention layer by forming a covalent bond with the above-mentioned ionizing radiation curable resin component by a chemical reaction. .. As a result, water repellency can be stably imparted to the surface of the snow accretion prevention layer, and water repellency can be maintained for a long period of time. Examples of the reactive functional group include a (meth) acryloyl group and an epoxy group.

Of these, silicone compounds are preferable. This is because the hardness of the snow accretion prevention layer can be increased, and scratch resistance, scratch resistance, abrasion resistance, and the like can be improved. As a result, it is possible to suppress a decrease in the snow accretion prevention function due to scratches.

The content of the water-repellent additive in the snow accretion prevention layer is not particularly limited as long as the desired snow accretion prevention function can be obtained, and is, for example, 0.1% by mass or more and 5% by mass or less. It may be 0.1% by mass or more and 2% by mass or less, or 0.1% by mass or more and 1% by mass or less. When the content of the water-repellent additive is within the above range, a sufficient snow accretion prevention function can be obtained.

(Iii) Weatherproofing agent The snow accretion prevention layer preferably contains a weatherproofing agent. Examples of the weather resistant agent include an ultraviolet absorber, a light stabilizer, an antioxidant and the like. For example, when the snow accretion prevention layer contains an ultraviolet ray inhibitor, deterioration of the cover due to ultraviolet ray absorption can be suppressed, and deterioration of transparency can be suppressed. Further, when the base material layer is arranged between the snow accretion prevention layer and the pressure-sensitive adhesive layer as described later, deterioration of the base material layer due to ultraviolet absorption can be suppressed, and the laminated film is transparent. It is possible to suppress the deterioration of sex.

The ultraviolet absorber is not particularly limited, and a general ultraviolet absorber can be used. For example, a triazine-based ultraviolet absorber, a benzotriazole-based ultraviolet absorber, a benzophenone-based ultraviolet absorber, and a cyanoacrylate-based agent. Examples thereof include ultraviolet absorbers, salicylate-based ultraviolet absorbers, oxalic acid anilide-based ultraviolet absorbers, and acrylonitrile-based ultraviolet absorbers. Among these, a triazine-based ultraviolet absorber, a benzotriazole-based ultraviolet absorber, and more preferably a triazine-based ultraviolet absorber are preferable. The ultraviolet absorber may be used alone or in combination of two or more.

The content of the ultraviolet absorber in the snow accretion prevention layer may be, for example, 0.1% by mass or more and 10% by mass or less, 0.3% by mass or more and 8% by mass or less, and may be 0. It may be 0.5% by mass or more and 5% by mass or less. When the content of the ultraviolet absorber is within the above range, a sufficient ultraviolet shielding effect can be obtained. When the snow-prevention layer contains a cured product of the UV-curable resin composition, it is difficult to add many UV absorbers because the curing reaction may be hindered, but the snow-prevention layer may be used. When a cured product of the electron beam curable resin composition is contained, many UV absorbers can be added.

Moreover, as a light stabilizer, for example, a hindered amine-based light stabilizer (HALS) can be mentioned.

The content of the light stabilizer in the snow accretion prevention layer may be, for example, 0.05% by mass or more and 5% by mass or less, 0.1% by mass or more and 3% by mass or less, and 0. . It may be 2% by mass or more and 2% by mass or less.

(Iv) Inorganic particles The snow accretion prevention layer preferably contains inorganic particles. A snow accretion prevention layer having excellent wear resistance can be obtained.

As the inorganic particles, for example, inorganic particles having an average primary particle size of 10 nm or more and 100 nm or less can be used.

As the inorganic particles, for example, metal oxide particles such as silica (colloidal silica, fumed silica, precipitated silica, etc.), alumina, zirconia, titania, zinc oxide and the like are preferably mentioned. Of these, silica particles or alumina particles are preferable from the viewpoint of improving transparency and wear resistance.

The particle shape is not particularly limited, and examples thereof include a sphere, an ellipsoid, a polyhedron, and a scaly shape. Above all, a spherical shape is preferable in that high hardness can be obtained.

The inorganic particles may be non-reactive or reactive inorganic particles having a reactive functional group on the surface. Preferred examples of the reactive functional group include a vinyl group, a (meth) acryloyl group, an allyl group, an epoxy group, a silanol group and the like. Of these, vinyl groups, (meth) acryloyl groups, and allyl groups are more preferable from the viewpoint of improving hardness and scratch resistance.

The inorganic particles may form a group of inorganic particles (variant inorganic particles) that are connected and aggregated with an average number of connected 2 or more and 20 or less. The articulated agglomeration may be regular or irregular.

Further, the deformed inorganic particles may have a reactive functional group on the surface. Preferred examples of the reactive functional group include a vinyl group, a (meth) acryloyl group, an allyl group, an epoxy group, a silanol group and the like.

The content of the inorganic particles in the snow accretion prevention layer is not particularly limited, and can be, for example, 5% by mass or more and 20% by mass or less, preferably 10% by mass or more and 15% by mass or less. When the content of the inorganic particles is within the above range, excellent wear resistance can be obtained.

(V) Other components The snow accretion prevention layer may contain various additives as necessary, as long as the snow accretion prevention function, transparency, chemical resistance and the like are not impaired. Examples of such additives include polymerization initiators, polymerization inhibitors, cross-linking agents, abrasion resistance improvers, infrared absorbers, antistatic agents, adhesive improvers, leveling agents, coupling agents, and slipperies. Examples thereof include antifouling agents, plasticizers, antifoaming agents, fillers, colorants, fillers and the like. The content of the additive can be arbitrarily set according to the purpose.

Further, it is preferable that the snow accretion prevention layer does not substantially contain fluorine atoms. Since the fluorine component is relatively soft, the snow accretion prevention layer substantially does not contain fluorine atoms, thereby increasing the hardness of the snow accretion prevention layer and improving scratch resistance, scratch resistance, abrasion resistance, etc. Because it can be done. As a result, it is possible to suppress a decrease in the snow accretion prevention function due to scratches. Further, some fluorine-based resins are decomposed by irradiation with ionizing radiation, and hydrofluoric acid may be generated by the decomposition. Therefore, it is preferable that the snow accretion prevention layer does not substantially contain fluorine atoms. In particular, the snow accretion prevention layer preferably does not contain fluorine atoms, that is, the content of the fluorine component in the snow accretion prevention layer is preferably 0% by mass.

(C) Thickness of snow accretion prevention layer The thickness of the snow accretion prevention layer is not particularly limited as long as it can exhibit the desired snow accretion prevention function, transparency, chemical resistance and the like. For example, it is preferably 2 μm or more and 20 μm or less, more preferably 3 μm or more and 15 μm or less, and further preferably 4 μm or more and 10 μm or less. If the snow accretion prevention layer is too thin, it may not be possible to exhibit sufficient snow accretion prevention function and chemical resistance, and sufficient hardness may not be obtained, resulting in deterioration of scratch resistance, scratch resistance, abrasion resistance, etc. In some cases. Further, if the snow accretion prevention layer is too thick, the transparency may be lowered, and cracks or warpage may occur.

(D) Method for Forming Snow Accretion Prevention Layer As a method for forming the snow accretion prevention layer, for example, a method of applying a curable resin composition and curing it can be mentioned.

The method for applying the curable resin composition is not particularly limited as long as it can uniformly apply the curable resin composition. For example, a gravure coating method, a bar coating method, a roll coating method, etc. Various methods such as a reverse roll coating method, a comma coating method, a spin coating method, a dip coating method, a spray coating method, a slide coating method, a flexographic printing method, and a screen printing method can be used. The amount of the curable resin composition applied is adjusted so that a snow accretion prevention layer having a desired thickness can be obtained.

Further, after applying the curable resin composition, it may be dried. Examples of the drying method include vacuum drying, heat drying, and a combination thereof.

As the curing method, at least one of irradiation with ionizing radiation and heating can be used. For irradiation of ionizing radiation, for example, an electron beam, ultraviolet rays, visible light or the like can be used. Among them, an electron beam is preferably used. This is because a high hardness snow accretion prevention layer can be obtained.

(2) Pressure-sensitive adhesive layer The pressure-sensitive adhesive layer in the present disclosure has transparency and is a member for adhering a laminated film to a cover, and has an adhesive force that enables the laminated film to be peeled off from the cover.

The pressure-sensitive adhesive layer in the present disclosure has an adhesive force that enables the laminated film to be peeled off from the cover. In other words, the pressure-sensitive adhesive layer is removable with respect to the cover. Here, the fact that the pressure-sensitive adhesive layer can be peeled off from the cover means that the laminated film can be closely fixed to the cover by the pressure-sensitive adhesive layer, and the cover is peeled off from the cover. It means that it can be peeled off by suppressing the generation of adhesive residue on the cover surface without destroying the cover.

Such pressure-sensitive adhesive layers include a pressure-sensitive adhesive layer having removability (first aspect of the pressure-sensitive adhesive layer) and a pressure-sensitive adhesive layer (pressure-sensitive adhesive layer) whose adhesive strength is reduced by a weak adhesive treatment. The second aspect of the layer). Hereinafter, each aspect will be described separately.

(A) First Aspect of Pressure Sensitive Adhesive Layer The first aspect of the pressure sensitive adhesive layer is a pressure sensitive adhesive layer having removability. The pressure-sensitive adhesive layer of this embodiment can be peeled off again without performing a weak adhesive treatment. Since the pressure-sensitive adhesive layer of this embodiment has re-peelability, when the laminated film is peeled from the cover, the peelability to the cover is good, the generation of adhesive residue on the cover surface is suppressed, and the laminated film is easily peeled off. It is possible to do. Further, although the pressure-sensitive adhesive layer of this embodiment has removability, the laminated film can be closely fixed to the cover.

The pressure-sensitive adhesive layer of this embodiment has removability and has an adhesive force that enables the laminated film to be peeled off from the cover. Specifically, the adhesive force of the pressure-sensitive adhesive layer to the cover is preferably 1N / 25mm or more and 50N / 25mm or less, more preferably 3N / 25mm or more and 30N / 25mm or less, and 5N / 25mm. It is more preferably 10 N / 25 mm or less. If the adhesive strength of the pressure-sensitive adhesive layer is within the above range, the laminated film can be adhered and fixed to the cover, and when the laminated film is peeled from the cover, the generation of adhesive residue on the cover surface is suppressed and peeled. can do.

Here, the adhesive force of the pressure-sensitive adhesive layer to the cover can be measured by a 180-degree peeling test method based on JIS Z0237. Specifically, a strip-shaped test piece having a width of 25 mm and a length of 150 mm is cut from the laminated film, and the test piece of the laminated film is attached to a cover in accordance with the JIS Z0237 standard, and the test piece is attached. Can be measured by peeling in the length direction of the test piece under the conditions of a peeling angle of 180 °, a peeling speed of 300 mm / min, and a room temperature. Further, for the measurement of the adhesive force, for example, a universal testing machine 5565 manufactured by Instron can be used.

The material of the pressure-sensitive adhesive layer of this embodiment is not particularly limited as long as it is a material capable of obtaining the pressure-sensitive adhesive layer having the above-mentioned adhesive strength. Above all, the pressure-sensitive adhesive layer preferably contains an acrylic resin. This is because the acrylic resin is hard to be brittle and has excellent transparency. In particular, the pressure-sensitive adhesive layer preferably contains an acrylic resin and a cured resin. This is because the pressure-sensitive adhesive layer can have removability because it contains an acrylic resin and a cured resin.

Here, the fact that the pressure-sensitive adhesive layer of this embodiment contains an acrylic resin means that the acrylic resin may exist alone in the layer without being crosslinked, and may be present between the acrylic resins or between the acrylic resins and others. It may exist as a crosslinked body formed by being crosslinked with the resin of the above, and both a single body and a crosslinked body may be present.

Further, the cured resin contained in the pressure-sensitive adhesive layer of this embodiment means a thermosetting resin or a photocurable resin cured by receiving heat or light irradiation.

The acrylic resin is not particularly limited, and for example, a (meth) acrylic acid ester polymer obtained by copolymerizing a (meth) acrylic acid ester, a (meth) acrylic acid ester containing (meth) acrylic acid ester as a main component, and others. Examples thereof include a (meth) acrylic acid ester copolymer obtained by copolymerizing the above-mentioned monomer. In addition, in this specification, (meth) acrylic acid means acrylic acid and / or methacrylic acid.

The thickness of the pressure-sensitive adhesive layer of this embodiment is not particularly limited as long as it can have a desired adhesive force, and is preferably 10 μm or more and 80 μm or less, and 15 μm or more and 60 μm or less. It is more preferable that it is 20 μm or more and 50 μm or less.

Examples of the method for forming the pressure-sensitive adhesive layer include a method of arranging a film-shaped pressure-sensitive adhesive layer and a method of applying a pressure-sensitive adhesive composition.

(B) Second Aspect of Pressure Sensitive Adhesive Layer The second aspect of the pressure sensitive adhesive layer is a pressure sensitive adhesive layer whose adhesive strength is reduced by a weak adhesive treatment. In the pressure-sensitive adhesive layer of this embodiment, the laminated film can be sufficiently adhered and fixed to the cover by the initial adhesive force. Further, when the laminated film is peeled from the cover, the pressure-sensitive adhesive layer is subjected to a weak adhesive treatment to reduce the adhesive force of the pressure-sensitive adhesive layer and improve the peelability. It is possible to suppress the generation of the residue and easily peel off the laminated film.

The pressure-sensitive adhesive layer of this embodiment has an adhesive force that reduces the adhesive force due to the weak adhesive treatment and enables the laminated film to be peeled off from the cover. Specifically, the adhesive force of the pressure-sensitive adhesive layer before the weak adhesive treatment to the cover is preferably 10 N / 25 mm or more and 20 N / 25 mm or less. Further, the adhesive force of the pressure-sensitive adhesive layer to the cover after the weak adhesive treatment is preferably 5N / 25 mm or less.

Here, the adhesive force of the pressure-sensitive adhesive layer to the cover can be measured by a 180-degree peeling test method based on JIS Z0237. The specific measurement method can be the same as the method described in the section of the first aspect of the pressure-sensitive adhesive layer described above.

Examples of the weak adhesive treatment include energy ray irradiation treatment, heat treatment, heat generation treatment by energy ray irradiation, and the like.

Hereinafter, the pressure-sensitive adhesive layer whose adhesive strength is reduced by the energy ray irradiation treatment will be described.

Examples of the energy rays to irradiate the pressure-sensitive adhesive layer include rays such as far ultraviolet rays, ultraviolet rays, near ultraviolet rays and infrared rays, electromagnetic waves such as X-rays and γ rays, as well as electron beams, proton rays and neutron rays. .. Of these, ultraviolet rays are preferable from the viewpoint of versatility and the like.

The material of the pressure-sensitive adhesive layer is not particularly limited as long as it has a predetermined adhesive force before and after irradiation with energy rays. The pressure-sensitive adhesive layer can contain, for example, a resin as a main agent, an energy ray-polymerizable oligomer, and a polymerization initiator. When the pressure-sensitive adhesive layer contains such a material, the energy ray-polymerizable oligomer contained in the pressure-sensitive adhesive layer is cured by irradiation with energy rays, and the adhesive force can be reduced. Since the cohesive force of the pressure-bonded layer is increased, transfer to the cover is less likely to occur, and peeling is facilitated.

Examples of the resin as the main agent include resins generally used as the main agent of pressure-sensitive adhesives such as acrylic resins, polyester resins, polyimide resins, and silicone resins. Of these, acrylic resins are preferable. This is because the acrylic resin is hard to be brittle and has excellent transparency.

Here, in the pressure-sensitive adhesive layer, the acrylic resin usually exists as a crosslinked body formed by cross-linking between the acrylic resins with a cross-linking agent, but even if a single acrylic resin is contained together with the cross-linked body. Good.

The acrylic resin is not particularly limited, and for example, a (meth) acrylic acid ester polymer obtained by copolymerizing a (meth) acrylic acid ester, a (meth) acrylic acid ester containing (meth) acrylic acid ester as a main component, and others. Examples thereof include a (meth) acrylic acid ester copolymer obtained by copolymerizing the above-mentioned monomer.

The energy ray-polymerizable oligomer is not particularly limited as long as it polymerizes by irradiation with energy rays, and examples thereof include photoradical polymerizable, photocationic polymerizable, and photoanionic polymerizable oligomers. Of these, photoradical polymerizable oligomers are preferable. This is because the curing rate is high, the compound can be selected from a wide variety of compounds, and the physical properties such as the adhesive force before curing and the peelability after curing can be easily controlled.

As the polymerization initiator, a general photopolymerization initiator can be used.

The pressure-sensitive adhesive layer may contain an energy ray-polymerizable monomer in addition to the energy ray-polymerizable oligomer. When irradiated with energy rays, the pressure-sensitive adhesive layer can be cured by three-dimensional cross-linking to reduce the adhesive force, and the cohesive force of the pressure-sensitive adhesive layer can be increased to prevent the pressure-sensitive adhesive layer from being transferred to the cover. Is.

As the energy ray-polymerizable monomer, a photoradical-polymerizable monomer is preferable, and among them, a polyfunctional acrylate having three or more (meth) acryloyl groups in one molecule and a polyfunctional methacrylate are preferable.

The pressure-sensitive adhesive layer may be a silane coupling agent, a tackifier, a metal chelating agent, a surfactant, an antioxidant, an ultraviolet absorber, a pigment, a dye, a colorant, an antistatic agent, a preservative, as required. It may contain various additives such as a defoaming agent and a wettability adjusting agent. Further, the pressure-sensitive adhesive layer may contain a fluorine-based resin or the like in order to improve the removability.

The thickness of the pressure-sensitive adhesive layer is not particularly limited as long as it has a desired adhesive force and allows energy rays to pass through to the inside, and is, for example, 10 μm or more and 80 μm or less. It is more preferable, it is more preferably 15 μm or more and 60 μm or less, and further preferably 20 μm or more and 50 μm or less.

Examples of the method for forming the pressure-sensitive adhesive layer include a method of arranging a film-shaped pressure-sensitive adhesive layer and a method of applying a pressure-sensitive adhesive composition.

(3) Base Material Layer The laminated film in the present disclosure preferably has a base material layer between the pressure-sensitive adhesive layer and the snow accretion prevention layer. Since the laminated film has a base material layer, workability when peeling the laminated film from the cover is improved. Further, for example, when the snow accretion prevention layer contains a water repellent additive, the water repellency on the surface of the snow accretion prevention layer is improved by bleeding the water repellent additive on the surface when the snow accretion prevention layer is formed. By forming a snow accretion prevention layer on the base material layer, a snow accretion prevention layer having an excellent snow accretion prevention function can be obtained.

The base material layer is not limited to the case where it has transparency and can support the above-mentioned snow accretion prevention layer and pressure-sensitive adhesive layer, and for example, a resin base material or a glass base material may be used. Can be done. As the material of the resin base material, for example, a general-purpose resin can be used, and specifically, a polyester resin such as polyethylene terephthalate (PET), a polyolefin resin such as polypropylene (PP), and triacetyl cellulose (TAC). Such as cellulose resin, acrylic resin such as polymethyl methacrylate (PMMA), vinyl resin such as polyvinyl chloride (PVC), polycarbonate (PC), cycloolefin polymer (COP) and the like. Of these, polyethylene terephthalate (PET) is preferably used from the viewpoint of transparency and cost.

The base material layer may be surface-treated in order to improve the adhesion to the snow accretion prevention layer.

The thickness of the base material layer is not particularly limited, and may be, for example, 15 μm or more and 250 μm or less, 20 μm or more and 125 μm or less, or 38 μm or more and 50 μm or less.

(4) Other Structures The laminated film in the present disclosure may have an arbitrary layer between the above layers. For example, a primer layer may be arranged between the snow accretion prevention layer and the base material layer. By arranging the primer layer, the adhesion between the snow accretion prevention layer and the base material layer can be improved.

(5) Arrangement of Laminated Film In the present disclosure, the laminated film may be arranged on the front surface of the cover on the path of the light emitted from the light source, and may be arranged on the entire front surface of the cover, for example. Often, it may be partially located on the front surface of the cover. When the laminated film is arranged on the entire front surface of the cover, it is possible to suppress the adhesion of snow on the entire cover. Further, when the laminated film is partially arranged on the front surface of the cover, the amount of the laminated film used can be reduced and the laminated film can be easily attached to the cover. Especially when the cover has a three-dimensional shape with a large curvature, it may be difficult to attach the laminated film to the entire surface of the cover. In such a case, the laminated film can be partially arranged on the front surface of the cover. The laminated film can be easily attached to the cover. 5 (a) and 5 (b) are examples of the lighting device having a plurality of light sources. In FIG. 5 (a), the laminated film 10 is arranged on the entire front surface of the cover 4, and FIG. 5 (b) shows. In, the laminated film 10 is arranged at least in the region 21 which is the path of the light emitted from the light source on the front surface of the cover 4, and is partially arranged on the front surface of the cover 4.

The path of the light emitted from the light source means a region on the front surface of the cover through which the light emitted from the light source passes.

Further, when the laminated film is partially arranged on the front surface of the cover, as described above, the laminated film may be arranged on the front surface of the cover on the path of the light emitted from the light source, for example. It may be arranged only in the region serving as the path of the light emitted from the light source, or may be arranged in the region serving as the path of the light emitted from the light source and the region located above this region.

Above all, it is preferable that the laminated film is arranged at least in a region serving as a path for light emitted from the light source and a region located above this region on the front surface of the cover. By also arranging the laminated film in a region located above the region that is the path of the light emitted from the light source, for example, on the front surface of the cover, the upper part of the region that is the path of the light emitted from the light source. This is because when snow adheres to the region located in, it is possible to prevent the irradiation light from the light source from being blocked by the snow sliding down.

Further, when there are a plurality of light sources and the laminated film is partially arranged on the front surface of the cover, the laminated film may be arranged for each region which is a path of light emitted from each light source. It may be arranged over a plurality of regions that serve as a path for light emitted from the light source.

(6) Aspects of Laminated Film The laminated film in the present disclosure has transparency.

As for the transparency of the laminated film, for example, the total light transmittance is preferably 80% or more, more preferably 85% or more, and further preferably 90% or more. When the total light transmittance of the laminated film is within the above range, a laminated film having good transparency can be obtained.

The total light transmittance can be measured according to JIS K7361-1.

Further, as the transparency of the laminated film, for example, the haze is preferably 2.0 or less, more preferably 1.5 or less, and further preferably 1.0 or less. If the haze of the laminated film is within the above range, a laminated film having good transparency can be obtained.

The haze can be measured in accordance with JIS K7136.

When the laminated film in the present disclosure has a pressure-sensitive adhesive layer, a base material layer, and a snow accretion prevention layer in order from the cover side, when the laminated film is peeled off from the cover due to the arrangement of the base material layer. Workability is improved. Further, for example, when the snow accretion prevention layer contains a water repellent additive, the water repellency on the surface of the snow accretion prevention layer is improved by bleeding the water repellent additive on the surface when the snow accretion prevention layer is formed. By forming a snow accretion prevention layer on the base material layer, a snow accretion prevention layer having an excellent snow accretion prevention function can be obtained.

When the laminated film has a pressure-sensitive adhesive layer, a base material layer, and a snow accretion prevention layer in this order, for example, a snow accretion prevention layer is formed on one surface of the base material layer, and a separator is formed on the other surface of the base material. A laminated film can be manufactured by arranging a pressure-sensitive adhesive sheet on which a pressure-sensitive adhesive layer is formed.

Further, when the laminated film in the present disclosure has a pressure-sensitive adhesive layer and a snow accretion prevention layer in this order from the cover side, and does not have a base material layer between the pressure-sensitive adhesive layer and the snow accretion prevention layer. , It is possible to avoid a decrease in transparency due to deterioration of the base material layer.

When the laminated film has a pressure-sensitive adhesive layer and a snow accretion prevention layer in this order, for example, a snow accretion prevention layer is formed on a support layer having a mold releasability, and a pressure sensitive layer is formed on the snow accretion prevention layer and on a separator. A laminated film can be manufactured by arranging the pressure-sensitive adhesive sheet on which the adhesive layer is formed. The laminated film thus produced can be used by peeling the support layer from the snow accretion prevention layer after attaching it to the cover.

2. Cover The cover in the present disclosure is a transparent member arranged in front of a light source.

The material of the cover is not particularly limited as long as it has transparency, and examples thereof include glass and resin. Examples of the resin include polyethylene, polypropylene, acrylonitrile-butadiene-styrene (ABS) resin, polyamide, acrylic resin, polyvinylidene chloride, polycarbonate, polyurethane, epoxy resin, cyclic polyolefin, polyethylene terephthalate, fiber reinforced plastic (FRP) and the like. Can be mentioned.

Of these, a resin cover is preferable. When the cover is made of resin, the resin has a relatively low thermal conductivity, and therefore, when snow or ice adheres to the lighting device, the snow or ice does not melt easily and easily adheres, so that the effect of the present disclosure can be enjoyed. Cheap.

Further, the cover may have a lens function.

The shape, thickness, etc. of the cover can be the same as that of a cover in a general moving body lighting device.

3. 3. Light Source The light source in the present disclosure is not particularly limited, and for example, a halogen lamp, a HID lamp, an LED, or the like can be used. Among them, LEDs are preferably used. The LED has a small amount of heat generation, and when snow or ice adheres to the lighting device, the snow or ice does not melt easily and easily adheres. Therefore, in the case of the LED, the effect of the present disclosure can be easily enjoyed.

The number of light sources may be one or more, for example, one or a plurality of light sources.

4. Other Configurations The lighting device in the present disclosure may have other configurations, if necessary, in addition to the above-mentioned light source, cover, and laminated film. Other configurations include, for example, lenses, reflectors, shades, housings, and the like.

5. Lighting device The lighting device in the present disclosure is installed on the outer peripheral portion of a moving body. Examples of the moving body include automobiles, railroad vehicles, aircraft and the like. Lighting devices in the present disclosure include, for example, automobile headlights, taillights, fog lights, turn signal lights, brake lights, high mount stoplights; railway vehicle headlights, taillights, exterior indicators, vehicle side lights; aircraft Collision prevention lights, aviation lights, landing lights, taxi lights, logo lights, etc.

B. Mobile body The mobile body in the present disclosure includes the above-mentioned lighting device on the outer peripheral portion. Since the moving body and the lighting device have been described above, the description thereof will be omitted here.

C. Laminated film The laminated film in the present disclosure is a transparent laminated film, which has a pressure-sensitive adhesive layer and a snow accretion prevention layer in this order, and the pressure-sensitive adhesive layer is attached to an adherend. It has an adhesive force that allows it to be peeled off.

FIG. 6 is a schematic cross-sectional view showing an example of the laminated film in the present disclosure. As shown in FIG. 6, the laminated film 10 has a pressure-sensitive adhesive layer 13, a base material layer 11, and a snow accretion prevention layer 12 in this order. The pressure-sensitive adhesive layer 13 has an adhesive force that allows it to be peeled off after being attached to the adherend.

In the example shown in FIG. 6, the laminated film 10 has a base material layer 11 between the pressure-sensitive adhesive layer 13 and the snow accretion prevention layer 12, but as shown in FIG. 7, the laminated film 10 has. , The pressure-sensitive adhesive layer 13 and the snow accretion prevention layer 12 may be provided.

In the present disclosure, the laminated film has a snow accretion prevention layer and a pressure-sensitive adhesive layer, and can be attached to, for example, a cover of a moving body lighting device via the pressure-sensitive adhesive layer. A snow accretion prevention function can be easily added to the lighting device. Further, since the pressure-sensitive adhesive layer has an adhesive force that can be peeled off after being attached to the adherend and can be peeled off again with respect to the adherend, for example, a laminated film is used to illuminate a moving body. When attached to the cover of the device, the laminated film can be easily peeled off from the cover of the lighting device of the moving body. Therefore, by attaching and peeling the laminated film, it is possible to easily add and remove the snow accretion prevention function to the lighting device of the moving body. Therefore, for example, in winter when the snow accretion prevention function is required, a laminated film is attached to the cover of the lighting device of the moving body, and in spring, summer, and autumn when the snow accretion prevention function is not required, the moving body is attached. The laminated film can also be peeled off from the cover of the luminaire.

Further, the laminated film in the present disclosure can be easily attached to the cover of the lighting device of a moving body, and can be cut into an arbitrary size and shape according to the size and shape of the cover of the lighting device. It can be easily applied to various lighting devices. Therefore, it is possible to more easily add the snow accretion prevention function to the lighting device of the moving body.

Further, since the laminated film in the present disclosure is in the form of a film, it is easy to handle, and coating is difficult depending on the arrangement of the lighting device of the moving body as in the case of the conventional method of applying a coating agent. It is possible to suppress the occurrence of problems such as uneven coating, unapplied coating, dripping, taking time to dry the coating film, and reducing the snow accretion prevention effect when uneven coating occurs.

Hereinafter, the structure of the laminated film in the present disclosure will be described.

(1) Snow accretion prevention layer The snow accretion prevention layer in the present disclosure is a layer having transparency and a snow accretion prevention function. The snow accretion prevention layer can be the same as that described in the above section "A. Lighting device 1. Laminated film (1) Snow accretion prevention layer", and thus the description thereof is omitted here.

(2) Pressure-sensitive adhesive layer The pressure-sensitive adhesive layer in the present disclosure is a transparent member for adhering a laminated film to an adherend, and can be peeled off after being attached to the adherend. Have power.

The pressure-sensitive adhesive layer in the present disclosure has an adhesive force that allows it to be peeled off after being attached to an adherend. In other words, the pressure-sensitive adhesive layer can be re-peelable to the adherend. Here, the fact that the pressure-sensitive adhesive layer can be re-peelable to the adherend means that the laminated film can be adhered and fixed to the adherend by the pressure-sensitive adhesive layer, and the laminated film can be removed from the adherend. It means that the adherend can be peeled off without destroying the adherend and suppressing the generation of adhesive residue on the surface of the adherend.

Such pressure-sensitive adhesive layers include a pressure-sensitive adhesive layer having removability (first aspect of the pressure-sensitive adhesive layer) and a pressure-sensitive adhesive layer (pressure-sensitive adhesive layer) whose adhesive strength is reduced by a weak adhesive treatment. The second aspect of the layer). Hereinafter, each aspect will be described separately.

(A) First Aspect of Pressure Sensitive Adhesive Layer The first aspect of the pressure sensitive adhesive layer is a pressure sensitive adhesive layer having removability. The pressure-sensitive adhesive layer of this embodiment can be re-peeled without performing a weak adhesive treatment. Since the pressure-sensitive adhesive layer of this embodiment has re-peelability, when the laminated film is peeled from the adherend, the peelability to the adherend is good, and adhesive residue is generated on the surface of the adherend. Can be easily peeled off. Further, although the pressure-sensitive adhesive layer of this embodiment has removability, the laminated film can be closely fixed to the adherend.

The pressure-sensitive adhesive layer of this embodiment has removability and has an adhesive force that enables peeling after being attached to an adherend. Specifically, the adhesive force of the pressure-sensitive adhesive layer is preferably 1N / 25mm or more and 20N / 25mm or less, more preferably 3N / 25mm or more and 15N / 25mm or less, and 5N / 25mm or more. It is more preferably 10 N / 25 mm or less. If the adhesive strength of the pressure-sensitive adhesive layer is within the above range, the laminated film can be adhered and fixed to the adherend, and when the laminated film is peeled from the adherend, adhesive residue on the surface of the adherend can be obtained. Can be peeled off while suppressing the occurrence of.

Here, the adhesive strength of the pressure-sensitive adhesive layer can be measured by a 180-degree peeling test method based on JIS Z0237. Specifically, a strip-shaped test piece having a width of 25 mm and a length of 150 mm is cut from the laminated film, and the test piece of the laminated film is attached to a polycarbonate plate in accordance with the JIS Z0237 standard for testing. The measurement can be performed by peeling the piece in the length direction of the test piece under the conditions of a peeling angle of 180 °, a peeling speed of 300 mm / min, and a room temperature. Further, for the measurement of the adhesive force, for example, a universal testing machine 5565 manufactured by Instron can be used. Further, for the polycarbonate plate, for example, a Lexan Margard sheet manufactured by SABIC can be used.

The material, thickness, forming method, etc. of the pressure-sensitive adhesive layer are described in the above section "A. Lighting device 1. Laminated film (2) Pressure-sensitive adhesive layer (a) First aspect of pressure-sensitive adhesive layer". Since it can be the same as that of the above, the description here is omitted.

(B) Second Aspect of Pressure Sensitive Adhesive Layer The second aspect of the pressure sensitive adhesive layer is a pressure sensitive adhesive layer whose adhesive strength is reduced by a weak adhesive treatment. The pressure-sensitive adhesive layer of this embodiment can sufficiently adhere and fix the laminated film to the adherend by the initial adhesive force. Further, when the laminated film is peeled from the adherend, the pressure-sensitive adhesive layer is subjected to a weak adhesive treatment to reduce the adhesive force of the pressure-sensitive adhesive layer and improve the peelability. It is possible to easily peel off the laminated film by suppressing the generation of adhesive residue on the surface.

The pressure-sensitive adhesive layer of this embodiment has an adhesive force that can be peeled off after being attached to the adherend by reducing the adhesive force by the weak adhesive treatment. Specifically, the adhesive strength of the pressure-sensitive adhesive layer before the weak adhesive treatment is preferably 10 N / 25 mm or more and 20 N / 25 mm or less. Further, the adhesive strength of the pressure-sensitive adhesive layer after the weak adhesive treatment is preferably 5N / 25 mm or less.

Here, the adhesive strength of the pressure-sensitive adhesive layer can be measured by a 180-degree peeling test method based on JIS Z0237. The specific measurement method can be the same as the method described in the section of the first aspect of the pressure-sensitive adhesive layer described above.

Regarding the weak adhesive treatment, the material, thickness, forming method, etc. of the pressure-sensitive adhesive layer, the above-mentioned "A. Lighting device 1. Laminated film (2) Pressure-sensitive adhesive layer (b) Second aspect of the pressure-sensitive adhesive layer" Since it can be the same as that described in the section of "", the description here is omitted.

(3) Base Material Layer The laminated film in the present disclosure preferably has a base material layer between the pressure-sensitive adhesive layer and the snow accretion prevention layer. The base material layer can be the same as that described in the above section "A. Lighting device 1. Laminated film (3) Base material layer", and thus the description thereof is omitted here.

(4) Other Structures The laminated film in the present disclosure may have an arbitrary layer between the above layers. For example, a primer layer may be arranged between the snow accretion prevention layer and the base material layer. By arranging the primer layer, the adhesion between the snow accretion prevention layer and the base material layer can be improved.

As shown in FIGS. 8 and 9, the laminated film in the present disclosure may have a separator 14 on the surface of the pressure-sensitive adhesive layer 13 opposite to the snow accretion prevention layer 12. The separator can be peeled off from the pressure-sensitive adhesive layer, and is peeled off from the pressure-sensitive adhesive layer when the laminated film is attached to the adherend. By arranging the separator on the surface of the pressure-sensitive adhesive layer, the surface of the pressure-sensitive adhesive layer becomes dirty or damaged before the laminated film is attached to the adherend via the pressure-sensitive adhesive layer. , It is possible to suppress a decrease in the initial adhesive force of the pressure-sensitive adhesive layer.

As the separator, a general separator used for the pressure-sensitive adhesive layer can be used, and examples thereof include a release film and a release paper. The separator is preferably subjected to an easy peeling treatment on the surface in contact with the pressure-sensitive adhesive layer.

As shown in FIG. 8, for example, the laminated film in the present disclosure may have a protective layer 15 on a surface of the snow accretion prevention layer 12 opposite to the base material layer 11. The protective layer can be peeled off from the snow accretion prevention layer, and after the laminated film is attached to the adherend, it is peeled off from the snow accretion prevention layer. By arranging the protective layer on the surface of the snow accretion prevention layer, the snow accretion prevention layer can be protected until the laminated film is attached to the adherend.

As shown in FIG. 9, for example, the laminated film in the present disclosure may have a support layer 16 on a surface of the snow accretion prevention layer 12 opposite to the pressure-sensitive adhesive layer 13. For example, by forming a snow accretion prevention layer on the support layer and arranging a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed on a separator on the snow accretion prevention layer, the pressure-sensitive adhesive layer and snow accretion prevention are provided. It is possible to produce a laminated film having a layer and having no base material layer between the pressure-sensitive adhesive layer and the snow accretion prevention layer. The support layer can be peeled off from the snow accretion prevention layer, and after the laminated film is attached to the adherend, it is peeled off from the snow accretion prevention layer.

(5) Aspects of Laminated Film When the laminated film in the present disclosure has a pressure-sensitive adhesive layer, a base material layer, and a snow accretion prevention layer in this order, the adherend is formed by arranging the base material layer. Workability when peeling the laminated film from the above is improved. Further, for example, when the snow accretion prevention layer contains a water repellent additive, the water repellency on the surface of the snow accretion prevention layer is improved by bleeding the water repellent additive on the surface when the snow accretion prevention layer is formed. By forming a snow accretion prevention layer on the base material layer, a snow accretion prevention layer having an excellent snow accretion prevention function can be obtained.

Further, when the laminated film in the present disclosure has a pressure-sensitive adhesive layer and a snow accretion prevention layer in this order and does not have a base material layer between the pressure-sensitive adhesive layer and the snow accretion prevention layer, the base film is used. It is possible to avoid a decrease in transparency due to deterioration of the material layer.

D. Laminated film construction method The laminated film construction method in the present disclosure includes a step of attaching the above-mentioned laminated film to a cover of a lighting device installed on an outer peripheral portion of a moving body.

The method of attaching the laminated film to the cover of the lighting device installed on the outer peripheral portion of the moving body is not particularly limited, and examples thereof include a method of attaching the laminated film to the cover while crimping it. Be done.

The laminated film may be arranged on the front surface of the cover on the path of the light emitted from the light source. For example, the laminated film may be attached to the entire front surface of the cover, or may be partially attached to the front surface of the cover. May be good. When the laminated film is attached to the entire front surface of the cover, it is possible to suppress the adhesion of snow on the entire cover. Further, when the laminated film is partially attached to the front surface of the cover, the amount of the laminated film used can be reduced and the laminated film can be easily attached to the cover. Especially when the cover has a three-dimensional shape with a large curvature, it may be difficult to attach the laminated film to the entire surface of the cover. In such a case, the laminated film can be partially attached to the front surface of the cover. , The laminated film can be easily attached to the cover.

When the laminated film is partially attached to the front surface of the cover, the laminated film may be attached to the front surface of the cover on the path of light emitted from the light source, for example, from the light source. It may be attached only to the region which is the path of the irradiated light, or may be attached to the region which is the path of the light emitted from the light source and the region located above this region.

Above all, it is preferable that the laminated film is attached at least to the region serving as the path of the light emitted from the light source and the region located above this region on the front surface of the cover. By attaching the laminated film to the region located above the region that is the path of the light emitted from the light source, for example, on the front surface of the cover, the upper part of the region that is the path of the light emitted from the light source. This is because when snow adheres to the located region, it is possible to prevent the irradiation light from the light source from being blocked due to the snow sliding down.

Further, the laminated film can be cut into an arbitrary size and shape according to the size and shape of the cover and the like.

The present disclosure is not limited to the above embodiment. The above embodiment is an example, and any object having substantially the same structure as the technical idea described in the claims of the present disclosure and exhibiting the same effect and effect is the present invention. Included in the technical scope of the disclosure.

Hereinafter, the present disclosure will be further described with reference to examples.

[Example 1]
(Preparation of laminated film)
1. 1. Formation of snow-prevention layer Urethane compound (HDI nurate- (PETA) 3) is 12% by mass, acrylate compound (caprolactone-modified isocyanurate) is 48% by mass, spherical nanosilica with an average primary particle size of 12 nm is 7% by mass, and triazine. 1.1% by mass of an ultraviolet absorber, 0.3% by mass of a hindered amine light stabilizer (HALS), and 0.4% by mass of a silicone compound having a (meth) acryloyl group at both ends were added to MEK ( Methyl ethyl ketone) was diluted to a solid content of 70% to prepare an electron beam curable resin composition.

The urethane compound is a mixture of HDI nurate- (PETA) 3 and IPDI- (PETA) 2. HDI Nurate- (PETA) 3 is a reaction product of pentaerythritol triacrylate and an isocyanate having an isocyanurate ring derived from hexamethylene diisocyanate. IPDI- (PETA) 2 is a reaction product of pentaerythritol triacrylate and isophorone diisocyanate.

A polyester film (Cosmoshine A4300 manufactured by Toyo Boseki Co., Ltd.) is used as the base material layer, and the electron beam curable resin composition is coated on the base material layer with a bar coater. A line was irradiated to crosslink the film to form a snowfall prevention layer having a basis weight of 5.2 g / m ^{2 (thickness 4.8 μm).} Subsequently, a protective film was attached onto the snow accretion prevention layer to prevent contamination when the pressure-sensitive adhesive layer was formed.

2. Formation of pressure-sensitive adhesive layer Main agent: Acrylic resin (SK Dyne 1429DT manufactured by Soken Chemical Co., Ltd.) and cross-linking agent: Aluminum chelating agent (AD-5A manufactured by Soken Chemical Co., Ltd.) are added at a ratio of 100: 3. An adhesive composition was prepared. Next, the pressure-sensitive adhesive composition was applied to the back surface of the base material layer on which the snow accretion prevention layer was formed with a bar coater to form a pressure-sensitive adhesive layer having a thickness of 25 μm. In addition, a separator was attached on the pressure-sensitive adhesive layer to prevent foreign matter from adhering. Since a cross-linking agent was added to this pressure-sensitive pressure-sensitive adhesive composition, it was cured at room temperature for 7 days.

(Evaluation)
1. 1. Transparency The total light transmittance of the laminated film was measured using an ultraviolet-visible spectrophotometer (V-700 manufactured by JASCO Corporation) in accordance with JIS K7361-1 and found to be 90.0%.

Further, the haze of the laminated film was measured in accordance with JIS K7136 using a direct reading haze meter manufactured by Toyo Seiki Seisakusho Co., Ltd. and found to be 0.6.

2. Contact angle The contact angle of the snow accretion prevention layer of the laminated film with water was measured by the θ / 2 method using a contact angle meter (DMs-401 manufactured by Kyowa Interface Science Co., Ltd.). Specifically, a droplet of 1.0 μL of pure water was dropped on the snow accretion prevention layer, and the contact angle 10 seconds after the drip was measured. The contact angle was 103.5 °.

Further, the following weather resistance test was carried out, and the contact angle of the snow accretion prevention layer with water was measured in the same manner and found to be 103.0 °.

<Weather resistance test>
An Atlas weather meter Ci5000 manufactured by Toyo Seiki Seisakusho Co., Ltd. was used to carry out a 3000-hour test in accordance with JIS K 5600-7-7.

3. 3. Chemical resistance After dropping chemicals on the snow accretion prevention layer of the laminated film, the film was capped, left for 24 hours, and then the appearance changed.
0.1 stipulated hydrochloric acid: no change 0.1 stipulated sodium hydroxide: no change White gas: no change Window washer fluid (manufactured by TACTI): no change

4. Composition analysis For the laminated film, the elements present on the surface of the snow accretion prevention layer were detected using an X-ray photoelectron analyzer (ESCA-3400 manufactured by Shimadzu Corporation). The measurement conditions were as follows. C: 54.9 atomic%, N: 1.2 atomic%, O: 24.7 atomic%, Si: 19.3 atomic%, and F was not detected.

<XPS measurement conditions>
Measurement area: 6 mmΦ
X-rays used: AlKα rays (non-monochromatic X-rays)
Acceleration voltage: 10kV

1 ... Lighting device 2 ... Light source 4 ... Cover 10 ... Laminated film 11 ... Base material layer 12 ... Snow accretion prevention layer 13 ... Pressure-sensitive adhesive layer 100 ... Moving body

Claims (14)

Light source and
A transparent cover placed in front of the light source,
A transparent laminated film placed on the front surface of the cover and
Is a lighting device installed on the outer periphery of a moving body.
The laminated film has a pressure-sensitive adhesive layer and a snow accretion prevention layer in this order from the cover side.
The pressure-sensitive adhesive layer is a lighting device having an adhesive force that enables the laminated film to be peeled off from the cover. The lighting device according to claim 1, wherein the surface of the snow accretion prevention layer has a contact angle with water of 90 ° or more. The lighting device according to claim 1 or 2, wherein the laminated film has a base material layer between the pressure-sensitive adhesive layer and the snow accretion prevention layer. The lighting device according to any one of claims 1 to 3, wherein the snow accretion prevention layer contains a cured product of an ionizing radiation curable resin composition containing a water-repellent additive. The lighting device according to claim 4, wherein the ionizing radiation curable resin composition is an electron beam curable resin composition. The lighting device according to claim 4 or 5, wherein the water-repellent additive is a silicone compound. A moving body including the lighting device according to any one of claims 1 to 6 on the outer peripheral portion. It has a pressure-sensitive adhesive layer and a snow accretion prevention layer in this order.
The pressure-sensitive adhesive layer has an adhesive force that allows it to be peeled off after being attached to the adherend.
Laminated film with transparency. The laminated film according to claim 8, wherein the surface of the snow accretion prevention layer has a contact angle with water of 90 ° or more. The laminated film according to claim 8 or 9, further comprising a base material layer between the pressure-sensitive adhesive layer and the snow accretion prevention layer. The laminated film according to any one of claims 8 to 10, wherein the snow accretion prevention layer contains a cured product of an ionizing radiation curable resin composition containing a water-repellent additive. The laminated film according to claim 11, wherein the ionizing radiation curable resin composition is an electron beam curable resin composition. The laminated film according to claim 11 or 12, wherein the water-repellent additive is a silicone-based compound. A method for constructing a laminated film, comprising a step of attaching the laminated film according to any one of claims 8 to 13 to a cover of a lighting device installed on an outer peripheral portion of a moving body.

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