JP2016214576A - Sticking sheet for headlight, headlight unit, and cleaning method of headlight cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sticking sheet for headlight which cleans a surface of a headlight cover and ensures transparency of the headlight cover, improves the performance and beautiful appearance, and can maintain the state for a long period.SOLUTION: The sticking sheet for headlight includes: a resin substrate layer; a solvent-containing layer formed on one face of the substrate layer; a sticking agent layer laminated on the other face of the substrate layer; and an overcoat layer laminated on an opposite side of the solvent-containing layer to the substrate layer. The solvent-containing layer contains a solvent that dissolves a surface of a headlight cover. The sticking sheet for headlight is used by being stuck on the surface of the headlight cover.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a headlight sticking sheet, a headlight unit, and a headlight cover cleaning method.

In recent years, headlight covers made of transparent resins such as polycarbonate resin and acrylic resin have been widely used as headlight covers for automobiles.
On the other hand, resin headlight covers are more likely to deteriorate over time than glass headlight covers, and when used for a long period of time, the headlight cover is cloudy or yellowish, and its transparency is reduced. There was a problem that the beauty was impaired.

For such a problem, it has been proposed to clean the surface of the headlight cover using a liquid chemical.
For example, Patent Document 1 proposes a resin cover abrasive for use in a headlight part of an automobile, which is mainly composed of a mixture of hard stone powder, a solvent, and water and contains a surfactant. It is described that a resin headlight cover can be restored to the state of a new vehicle by using a polishing agent for a resin cover.

JP 2007-297557 A

  However, when the surface of the headlight cover is cleaned using a liquid chemical as described in Patent Document 1 or the like, the effect of recovering the transparency of the headlight cover is temporary, and the head over a long period of time. There was a problem that it was difficult to maintain the transparency of the light cover.

  In view of such a situation, the present invention can remove the yellowing and cloudiness of the headlight cover to restore the transparency of the headlight cover, and can improve the transparency of the restored headlight cover over a long period of time. It aims at providing the sticking sheet for headlights which can be maintained.

In order to achieve the above object, the present invention takes the following technical means.
That is, the headlight patch sheet of the present invention includes a resin base layer, a solvent-containing layer formed on one side of the base layer, and an adhesive laminated on the other side of the base layer. And an overcoat layer laminated on the opposite side of the solvent-containing layer from the base material layer, the solvent-containing layer containing a solvent that dissolves the surface of the headlight cover, It is characterized by being attached to the surface of the light cover.

In such a headlight patch sheet, since the solvent-containing layer containing a solvent that dissolves the surface of the headlight cover is formed on one surface of the base material layer, the headlight patch sheet is used as the headlight cover. By sticking on the surface, it is possible to remove yellowing and dullness on the surface of the headlight cover and to perform cleaning to restore transparency.
The reason is presumed as follows.
In the above-mentioned headlight adhesive sheet, a part or all of the solvent-containing layer formed on one surface of the base material layer is impregnated in the base material layer, and such a headlight adhesive sheet is used as a headlight cover. When affixed to the surface, the solvent contained in the solvent-containing layer gradually penetrates the surface of the headlight cover through the base material layer and the pressure-sensitive adhesive layer, and dissolves the surface of the headlight cover. And, the surface of the headlight cover is dissolved, and the headlight cover sheet is affixed to the surface of the headlight cover. Assuming that the unevenness that is caused is eliminated, and the flexible adhesive layer follows the surface shape of the headlight cover, the transparency of the headlight cover is restored and the surface of the headlight cover is cleaned. Yes.

Moreover, in the said headlight sticking sheet, the overcoat layer is laminated | stacked on the outer side (the side opposite to a headlight cover when it affixes on a headlight cover) of the said solvent containing layer.
Therefore, the solvent contained in the headlight adhesive sheet (solvent-containing layer) hardly diffuses outside the headlight adhesive sheet, and the headlight adhesive sheet contains a solvent for a long period of time. The cleaning performance due to the above-described effects can be maintained for a long period of time.

In the headlight patch sheet, the headlight cover is preferably a polycarbonate resin headlight cover.
Polycarbonate resin is widely used as a material for the headlight cover, and is a material particularly suitable for cleaning yellowing and clouding produced in the headlight cover by the above-mentioned headlight cover sheet.

In the headlight patch sheet, the solvent contained in the solvent-containing layer is preferably isophorone.
Isophorone is suitable as a solvent that can appropriately dissolve the surface of the headlight cover, and is particularly suitable as a solvent that dissolves the surface of the headlight cover made of polycarbonate resin. Moreover, since the isophorone has a high boiling point, it is difficult to diffuse from the headlight adhesive sheet, and the effect of the present invention can be maintained over a long period of time.

In the headlight patch sheet, the base material layer is preferably made of a vinyl chloride resin composition.
A film (sheet) made of a vinyl chloride resin composition is excellent in transparency and does not hinder the transmission of light from the headlight, and is excellent in flexibility and excellent in conformity to the surface shape of the headlight cover. Have good weather resistance.

The headlight unit of the present invention includes a headlight cover to which the headlight adhesive sheet of the present invention is attached.
In the headlight unit of the present invention, since the above-mentioned headlight adhesive sheet is adhered to the surface of the headlight cover, the transparency of the headlight cover can be maintained over a long period of time.

The first headlight cover cleaning method according to the present invention is characterized in that the headlight adhesive sheet of the present invention is adhered to the surface of the headlight cover.
According to the first headlight cover cleaning method, the headlight cover sheet of the present invention is attached to the surface of the headlight cover. Therefore, yellowing and dullness on the surface of the headlight cover are removed, and the headlight cover is transparent. The properties can be restored, and further, the restored transparency can be maintained over a long period of time.

The second headlight cover cleaning method according to the present invention includes a laminate including a base material layer and an adhesive layer, and at least one of the base material layer and the adhesive layer covers the surface of the headlight cover. A headlight sticking sheet containing a dissolving solvent is stuck on the surface of the headlight cover.
In the second headlight cover cleaning method, the surface of the headlight cover can be cleaned by attaching the headlight sticking sheet to the surface of the headlight cover.
The reason for this is that, similarly to the above, the surface of the headlight cover is dissolved by the solvent contained in the base material layer and / or the pressure-sensitive adhesive layer, and the headlight cover sheet is attached to the surface of the headlight cover. By attaching, the unevenness caused by deterioration on the surface of the headlight cover, which causes yellowing and dullness, is eliminated, and the flexible adhesive layer follows the surface shape of the headlight cover. .
In the second headlight cover cleaning method, since the base material layer is attached to the surface of the headlight cover, the cleaned state can be maintained for a long period of time.

  According to the present invention, it is possible to clean the surface of the headlight cover to ensure the transparency of the headlight cover, improve performance and aesthetics, and maintain the state for a long period of time.

It is a perspective view which shows typically an example of the sticking sheet for headlights of this invention. (A)-(c) is sectional drawing for demonstrating an example of the manufacturing method of the sticking sheet for headlights of this invention. (A)-(c) is a perspective view for demonstrating a part of manufacturing process shown in FIG. In the performance evaluation 1 which concerns on an Example, it is a schematic diagram for demonstrating the position which affixed the headlight sticking sheet. (A) is the photograph of the headlight cover just before sticking the headlight sticking sheet in the performance evaluation 1 according to the embodiment, and (b) is the headlight sticking sheet stuck in the performance evaluation 1. It is the photograph of the headlight cover after attaching. (A) is the photograph of the headlight cover before sticking the sticking sheet for headlights in the performance evaluation 2 which concerns on an Example, (b) is the elements on larger scale of (a), (c) These are the pictures of the headlight cover after sticking the headlight sticking sheet in the same performance evaluation 2, and are pictures of the same part as (b). In performance evaluation 3 which concerns on an Example, it is a photograph of the cover of the headlight with which the sticking sheets D, C, and A for headlight were affixed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view schematically showing an example of the headlight patch sheet of the present invention.
As shown in FIG. 1, the headlight adhesive sheet 10 includes a resin base layer 11, a solvent-containing layer 12 formed on one surface (upper surface in the drawing) of the base layer 11, and a base material An adhesive layer 13 laminated on the other surface (lower surface in the figure) of the layer 11, and an overcoat layer 14 laminated on the opposite side (upper side in the figure) of the solvent-containing layer 12; The release paper 15 is provided on the opposite side (lower side in the figure) of the adhesive layer 13 to the base material layer 11.
The overcoat layer 14 includes a second base material layer 14a and a second pressure-sensitive adhesive layer 14b.

The base material layer 11 is a resin film, and the material is not particularly limited as long as it is transparent.
Examples of the material of the base material layer 11 include a vinyl chloride resin composition, a polyester resin composition containing PET, an acrylic resin composition, a urethane resin composition, and the like.
Among these, a vinyl chloride resin composition is preferable. The reason is as described above.

Examples of the vinyl chloride resin composition include a resin composition containing a vinyl chloride resin and a plasticizer. The vinyl chloride resin composition is based on various additives generally blended in the vinyl chloride resin composition, such as ultraviolet absorbers, stabilizers, lubricants, modifiers, fillers, etc., if necessary. You may contain in the range which does not impair the transparency of the material layer 11. FIG.
Examples of the vinyl chloride resin include vinyl chloride homopolymers, copolymers of vinyl chloride and other monomers copolymerizable therewith.
As said plasticizer, the plasticizer generally mix | blended with a vinyl chloride-type resin composition can be used.

  The pressure-sensitive adhesive layer 13 is not particularly limited as long as it has transparency and can attach the base material layer 11 to the headlight cover, and can be made of a conventionally known pressure-sensitive adhesive. . Specific examples of the pressure-sensitive adhesive layer 13 include those made of a rubber-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, and the like.

In this invention, the commercial item of the laminated body of a transparent resin film and an adhesive layer can also be used as the base material layer 11 with which the adhesive layer 13 was laminated | stacked on the single side | surface.
Specific examples of the above-mentioned commercially available products include, for example, trade name “Lumiguard” manufactured by ICC Corporation, product name “LAG Protect” manufactured by Lintec Corporation, and the like. Among these, Lumiguard L-250 (manufactured by ICC) and LAG protect G-011PV50E (manufactured by Lintec) are preferable.
In addition, for example, a product used as an overlaminate film for inkjet media can be used.

The solvent-containing layer 12 can be formed using, for example, an ink composition containing a solvent.
Examples of the ink composition include those containing a main agent and a solvent, and further containing various additives such as a softening agent, an ultraviolet absorber, a curing agent, and a brightening agent (a blueing agent) as necessary. It is done.

Examples of the main agent include transparent solvent-type ink, and transparent solvent-type gloss ink for screen printing is particularly preferable. As such a solvent-type ink, various commercially available products can be used.
Specific examples of the commercial products include SH medium (manufactured by Jujo Chemical Co., vinyl ink H-type halftone), SG700 medium (manufactured by Seiko Advance Co., Ltd.), and the like.

The solvent is not particularly limited as long as it can dissolve the surface of the headlight cover, and may be appropriately selected in consideration of the material of the headlight cover.
As the solvent, a solvent having a high boiling point is preferable. This is because a solvent having a high boiling point is less likely to diffuse out of the sheet, and the headlight patch sheet can maintain its effect for a longer period of time.

Specific examples of the solvent include, when the headlight cover is a polycarbonate resin or acrylic resin headlight cover, for example, isophorone, methyl acetate, butyl acetate, toluene, acetone, xylene, methyl ethyl ketone (MEK). Methyl isobutyl ketone (MIBK), cyclohexane, high-boiling ester solvents and the like. These may be used alone or in combination of two or more.
Of these, isophorone is preferred. This is because isophorone is a solvent that is also used as a retarder in solvent-based inks, has a high boiling point, and can ensure the effects of the present invention over a long period of time.
In the present invention, the headlight cover made of polycarbonate resin means a headlight cover manufactured using a resin composition mainly composed of polycarbonate resin, and the headlight cover made of acrylic resin means acrylic resin. The headlight cover manufactured using the resin composition which has as a main component.

In the ink composition, the blending amount of the solvent is preferably 10 to 50 parts by weight and more preferably 20 to 40 parts by weight with respect to 100 parts by weight of the main agent.
This is because the solvent-containing layer is easily formed within this range, and the headlight patch sheet is suitable for containing the solvent for a long period of time.

A conventionally well-known thing can be used as said softener and said ultraviolet absorber, For example, the softener and ultraviolet absorber which are used for the solvent-type ink for screen printing can be used conveniently.
A conventionally well-known thing can be used as said hardening | curing agent, For example, what is necessary is just to select and use suitably the hardening | curing agent used for the solvent-type ink for screen printing according to the kind of main ingredient.
As the brightening agent, for example, a conventionally known brightening agent such as an optical brightening agent or a fluorescent brightening agent using a blue pigment can be used.

The solvent-containing layer 12 can be formed, for example, by printing the ink composition on one side of the base material layer 11.
Here, the method for printing the ink composition is not particularly limited, and for example, known printing methods such as gravure printing, offset printing, screen printing, transfer printing from a transfer sheet, and ink jet printing can be employed.
Of these, screen printing is preferred. This is because it is a printing method suitable for printing so that a part or all of the solvent-containing layer 12 is impregnated in the base material layer 11, and it is easy to repeatedly print solvent type inks repeatedly.
In FIG. 1, the solvent-containing layer 12 is drawn as being laminated on the base material layer 11. However, in the headlight patch sheet 10 of the present invention, at least a part of the solvent-containing layer 12 is usually used. Is formed in a state where the base material layer 11 is impregnated (absorbed).

The overcoat layer 14 includes a second base material layer 14a and a second pressure-sensitive adhesive layer 14b.
As the 2nd base material layer 14a, the thing similar to the transparent resin film which can be used for the base material layer 11 can be used.
As the 2nd adhesive layer 14b, the thing similar to the adhesive layer 13 can be used.
Therefore, as the overcoat layer 14, a commercial product of a laminate of a transparent resin film and an adhesive layer, such as “Lumiguard” manufactured by IKEC, Lintec, and “LAG Protect” can be used.
In the headlight patch sheet 10, the base material layer 11 and the second base material layer 14a may be made of the same material, or may be made of different materials. The pressure-sensitive adhesive layer 13 and the second pressure-sensitive adhesive layer 14b may be made of the same material or different materials.
Further, the overcoat layer does not necessarily include the second pressure-sensitive adhesive layer. For example, a transparent resin film capable of thermocompression bonding is thermocompression bonded to the base material layer 11 on which the solvent-containing layer 12 is formed. A layer or a layer formed by applying a curable resin composition and then curing it may be used.

The headlight adhesive sheet 10 having such a configuration is used after the release paper 15 is peeled off, and then the adhesive layer 13 side is attached to a headlight cover (not shown).
The headlight cover is a headlight cover made of a transparent resin such as an acrylic resin or a polycarbonate resin. A headlight cover made of polycarbonate resin is preferable as the headlight cover to be cleaned by the headlight sticking sheet of the present invention.
Although the thickness (thickness in the state which peeled the release paper 15) of the sticking sheet 10 for headlights is not specifically limited, About 150-200 micrometers is preferable.

  The headlight cover to which the headlight sticking sheet is attached is restored to transparency by cleaning the headlight cover, and the state is maintained for a long period of time. Therefore, the performance and aesthetics of the headlight cover to which the headlight adhesive sheet is attached are good.

A headlight unit provided with a headlight cover on which the headlight sticking sheet is attached is also one aspect of the present invention.
The headlight cover cleaning method by sticking the headlight sticking sheet to the headlight cover is also one aspect of the present invention (first headlight cover cleaning method).

Next, a method for producing the headlight sticking sheet will be described with reference to the drawings. Here, the case where the ink composition is printed by screen printing to form the solvent-containing layer will be described as an example.
2A to 2C are cross-sectional views for explaining an example of the manufacturing process of the headlight patch sheet of the present invention.
3A to 3C are perspective views for explaining a part of the manufacturing process shown in FIG.

(1) First, as shown in FIG. 2A, a laminate 21 in which the adhesive layer 13 and the release paper 15 are laminated on one side of the base material layer 11 is produced.
Specifically, for example, while producing a resin film (base material layer 11) by a known method such as calendar molding or extrusion molding, the adhesive layer 13 is formed on the release paper 15 separately from this, The pressure-sensitive adhesive layer 13 can be produced by attaching the release paper 15 together with a resin film (base material layer 11).
Moreover, as the laminated body 21, a commercial item can also be used as above-mentioned.

(2) Next, as shown in FIG.2 (b), the solvent containing layer 12 is formed in the surface on the opposite side to the side by which the adhesive layer 13 of the base material layer 11 which comprises the laminated body 21 was laminated | stacked.
First, as shown in FIG. 3A, the solvent-containing layer 12 is formed by setting a printing plate 29 having a screen 28 on the upper surface of the laminate 21 (base material layer 11, adhesive layer 13, release paper 15). Then, as shown in FIG. 3B, the ink composition 30 is supplied onto the screen 28 and screen printing is performed to print the ink composition 30 on the base material layer 11.
At this time, the printing plate 29 used in the screen printing preferably includes a screen 28 having a mesh that is coarser than the standard usage standard of the ink composition 30. As a result, a considerably larger amount of the ink composition 30 is supplied onto the base material layer 11, and as a result, the base material layer is easily impregnated with the ink composition. And the base material layer impregnated with the ink composition (solvent) is rich in flexibility.
The standard usage standard means a mesh size recommended by a sales company according to solvent type ink or the like.

For example, when an ink composition containing SH medium (manufactured by Jujo Chemical Co., Ltd., vinyl ink H type halftone) and vinyl retarder (manufactured by Jujo Chemical Co., Ltd., a slow drying agent containing isophorone) is used as the ink composition. May be screen-printed using a printing plate having a screen with 80-120 mesh openings.
In addition, about 200-300 mesh is appropriate for the standard use standard of SH medium.

Moreover, when printing the ink composition 30 on the base material layer 11 by screen printing, the ink composition 30 may be printed only once, or may be printed a plurality of times (for example, twice) continuously. Also good.
More ink composition 30 can be supplied on the base material layer 11 by printing several times continuously. However, the printing of the ink composition 30 is not so good that it is repeated many times. If the number of repetitions increases, there is a possibility that inconveniences such as cracks occur in the formed solvent-containing layer 12.
For this reason, when the solvent-containing layer 12 is formed by printing the ink composition 30 by screen printing, the number of continuous application of the ink composition 30 is preferably about 2 times.

Furthermore, after application of the ink composition 30, curing is performed for a predetermined time, and the ink composition 30 is awaited to be dried. This drying may be natural drying, but may be performed using a heating device 26 as shown in FIG. What is necessary is just to set the heating temperature in this case suitably according to compositions, such as a base material layer and an ink composition, for example, can be about 30-100 degreeC. The minimum with the said preferable heating temperature is 60 degreeC, and a preferable upper limit is 80 degreeC.
Moreover, what is necessary is just to select heating time suitably, for example, it is good to set it as about 15 minutes-60 minutes.

In this step, the process of printing and drying the ink composition 30 may be performed only once, or the printing / drying process may be one cycle, and this cycle may be repeated a plurality of times.
Thus, the application amount of the ink composition to the base material layer 11 can be sufficiently secured by repeating the application and drying cycle of the ink composition 30 a plurality of times.

  In this step, by forming the solvent-containing layer 12 on one side of the base material layer 11 using such a method, a part or all of the solvent-containing layer is formed in a state where the base material layer 11 is impregnated. The Therefore, the headlight adhesive sheet of the present invention contains a solvent for dissolving the surface of the headlight cover in the base material layer.

(3) Next, as shown in FIG.2 (c), the overcoat layer 14 is further laminated | stacked on the base material layer 11 in which the solvent containing layer 12 was formed.
The overcoat layer 14 may be formed by adhering the resin film 14 via the pressure-sensitive adhesive layer 14b. For example, a laminate similar to the laminate 21 used in the step (1) may be used as a release paper. After removing, the base material layer 11 on which the solvent-containing layer 12 is formed may be attached.
Of course, the overcoat layer may be laminated by other methods, for example, a pressure-sensitive adhesive may be applied using a known application method such as application by a bar coater, and then laminated by adhering a resin film. .
Through the steps (1) to (3), the headlight patch sheet of the present invention can be produced.

Next, a second headlight cover cleaning method according to the present invention will be described.
As described above, the second headlight cover cleaning method includes a laminate including a base material layer and an adhesive layer, and at least one of the base material layer and the adhesive layer is a surface of the headlight cover. A sticking sheet for headlights containing a solvent that dissolves is attached to the surface of the headlight cover.
Such a headlight patch sheet (hereinafter also referred to as a second headlight patch sheet) contains a solvent in which the base layer and / or the adhesive layer dissolves the surface of the headlight cover. As already described, the surface of the headlight can be cleaned and maintained in that state.

In the second headlight patch sheet, when the base material layer contains a solvent, as the base material layer containing the solvent, for example, a printing method such as screen printing is used for the base material layer 11 as described above. Examples thereof include those similar to the base material layer 11 on which the solvent-containing layer 12 is formed.
In the second headlight patch sheet, when the pressure-sensitive adhesive layer contains a solvent, as the pressure-sensitive adhesive layer containing a solvent, for example, a pressure-sensitive adhesive composition containing a polymer component and a solvent can be used as a release paper or the like. When a pressure-sensitive adhesive layer is formed by applying to a solvent, a solvent that dissolves the surface of the headlight cover (for example, a solvent that dissolves polycarbonate resin) is blended as a solvent, and this solvent remains in the pressure-sensitive adhesive layer. A pressure-sensitive adhesive layer formed by drying the pressure-sensitive adhesive composition under such drying conditions can be used.

In the second headlight adhesive sheet, the solvent for dissolving the surface of the headlight cover may be formed only in one of the base material layer and the pressure-sensitive adhesive layer, or may be formed in both. May be.
The second headlight adhesive sheet may have an overcoat layer laminated on the side opposite to the adhesive layer of the base material layer, like the headlight adhesive sheet 10 shown in FIG.
In this case, the solvent contained in the second headlight adhesive sheet is less likely to diffuse outside.

  The material for the base material layer, the pressure-sensitive adhesive layer, and the overcoat layer constituting the second headlight adhesive sheet, except that it contains a solvent, if necessary, the headlight adhesive sheet of the present invention. The same can be used.

EXAMPLES Hereinafter, although an Example is hung up and demonstrated in more detail about this invention, this invention is not limited only to these Examples.
Here, the adhesive sheet for headlights of the present invention was produced, and the cleaning performance was evaluated.

Example 1
(1) Preparation of Ink Composition A A solvent containing a curing agent (manufactured by Jujo Chemical Co., JA-940) and isophorone with respect to 100 parts by weight of SH media (manufactured by Jujo Chemical Co., vinyl ink H type halftone) ( 30 parts by weight of a vinyl retarder (manufactured by Jujo Chemical Co., Ltd.) was added and mixed uniformly to prepare ink composition A.

(2) Preparation of headlight patch sheet A First, Lumiguard L-250 (manufactured by ICC), which is a laminate 21 of the base material layer 11, the adhesive layer 13, and the release paper 15, is prepared. The ink composition A was printed by screen printing on the surface of the material layer 11 opposite to the side on which the pressure-sensitive adhesive layer 13 was laminated.
Here, screen printing was performed using a screen 28 having a mesh size of 100 mesh as the screen 28 of the printing plate 29 and using a power squeegee G as the squeegee 24.
Moreover, screen printing was performed by continuous printing twice.
Thereafter, heating and drying treatment is performed using a heating device 26 under the conditions of 80 ° C. and 30 minutes,
A solvent-containing layer 12 was formed (see FIG. 2B and FIGS. 3A to 3C).

Next, the overcoat layer 14 was formed on the solvent-containing layer 12 formed in the above process.
Here, Lumiguard L-250 (manufactured by IKEC Corporation) from which the release paper has been peeled is bonded to the base material layer 11 on which the solvent-containing layer 12 is formed, and then heated at 60 ° C. for 30 minutes. Lumiguard L-250 was blended to form overcoat layer 14 (see FIG. 2C).
By passing through such a process, the headlight sticking sheet A was completed.

(Example 2)
(1) Preparation of ink composition B With respect to 100 parts by weight of SH media (manufactured by Jujo Chemical Co., Ltd., vinyl ink H-type halftone), 10 parts by weight of a softening agent (manufactured by Jujo Chemical Co., JA-704), a curing agent ( Jujo Chemical Co., Ltd. (JA-940) and isophorone-containing solvent (Jujo Chemical Co., Ltd., vinyl retarder) 30 parts by weight were added and mixed uniformly to prepare ink composition B.

(2) Preparation of headlight patch sheet B A headlight patch sheet was prepared in the same manner as in Example 1 except that ink composition B was used instead of ink composition A as the ink composition. A light sticking sheet B was prepared.

(Performance evaluation 1)
The headlight adhesive sheets A and B manufactured in Examples 1 and 2 were attached to the surface of a headlight cover (made of polycarbonate resin) of an automobile (manufactured by Toyota, bB), and the state of the headlight cover before and after attachment was visually observed. Observed.
Here, as shown in FIG. 4, after cutting each of the headlight sticking sheet A and the headlight sticking sheet B to an appropriate size, the release paper is peeled off and the left side of the automobile (as viewed from the driver's seat side). The headlight cover was attached with a small gap between them.
In addition, before sticking each sticking sheet for headlights, the stain | pollution | contamination of the surface of the headlight cover was removed with the degreasing agent. However, no treatment using a headlight cleaner was performed.

As a result, it was observed that the yellowing or dullness of the headlight cover was eliminated by sticking the headlight sticking sheet A or the headlight sticking sheet B, the transparency was recovered, and the state was maintained. .
FIG. 5 shows a photograph of the headlight cover in performance evaluation 1. In FIG. 5, (a) is a photograph of the headlight cover immediately before the headlight sticking sheet is stuck, and (b) is the headlight after 30 days have passed since the headlight sticking sheet was stuck. It is a photograph of a cover.

(Performance evaluation 2)
The headlight adhesive sheet B manufactured in Example 2 was attached to the surface of a headlight cover (made of polycarbonate resin) of an automobile (BMW, 5 series, E39 wagon), and the state of the headlight cover before and after the attachment was visually observed. Observed.
Here, after cutting the headlight sticker sheet B into an appropriate size, the release paper was peeled off and stuck to the entire headlight cover on the left side of the automobile (viewed from the driver's seat side).
In this evaluation, the surface of the headlight cover was once wiped with a commercially available headlight cleaner (made by Carmate, headlight polish), and then a headlight adhesive sheet was attached.

As a result, it was observed that the yellowing or dullness of the headlight cover was eliminated and the transparency was restored by applying the headlight adhesive sheet B.
FIG. 6 shows a photograph of the headlight cover in performance evaluation 2. In FIG. 6, (a) is a photograph of the headlight cover before affixing the headlight adhesive sheet (after wiping with a headlight cleaner), and (b) is a partially enlarged view of (a). (C) is an enlarged photograph of the headlight cover immediately after the headlight sticking sheet is stuck, and is a photograph of the same part as (b).

Example 3
First, ink composition C was prepared by the following method.
Ink composition C was prepared in the same manner as in Example 1 except that a vinyl standard solvent (manufactured by Jujo Chemical Co.) was used instead of the solvent containing isophorone (manufactured by Jujo Chemical Co., vinyl retarder).
Thereafter, a headlight adhesive sheet C was prepared in the same manner as in Example 1 except that the ink composition C was used in place of the ink composition A.

(Comparative Example 1)
A headlight adhesive sheet D was prepared in the same manner as in Example 1 except that the ink composition A was not printed.
That is, two Lumiguard L-250s (made by IKEC Co., Ltd.) were directly bonded together to produce a headlight bonding sheet D.

(Performance evaluation 3)
The headlight adhesive sheet produced in each of Comparative Example 1 and Examples 1 and 3 was applied to the surface of the headlight cover (made of polycarbonate resin), and the state of the headlight cover after application was visually observed.
Here, as shown in FIG. 7, two headlight patch sheets D, C and A each cut to an appropriate size are provided, with a small gap between the headlight patch sheets in order from the left. While sticking side by side.
As a result, it was observed that the yellowing or dullness of the headlight cover was eliminated and the transparency was restored by applying the headlight adhesive sheets C and A. It was also observed that the effect was more remarkable when the headlight patch sheet A was pasted.
FIG. 7 shows a photograph of the headlight cover to which the headlight sticking sheets D, C, and A are attached in the performance evaluation 3.

DESCRIPTION OF SYMBOLS 10 Adhesive sheet for headlights 11 Base material layer 12 Solvent-containing layer 13 Adhesive layer 14 Overcoat layer 14a 2nd base material layer 14b 2nd adhesive layer 21 Laminated body 24 Squeegee 26 Heating device 28 Screen 29 Printing plate 30 Ink composition object

Claims (7)

A resin base layer;
A solvent-containing layer formed on one surface of the base material layer;
An adhesive layer laminated on the other surface of the base material layer;
An overcoat layer laminated on the side opposite to the base material layer of the solvent-containing layer,
The solvent-containing layer contains a solvent that dissolves the surface of the headlight cover,
An adhesive sheet for a headlight, which is used by being attached to the surface of a headlight cover.   The headlight cover sheet according to claim 1, wherein the headlight cover is a polycarbonate resin headlight cover.   The headlight patch sheet according to claim 2, wherein the solvent contained in the solvent-containing layer is isophorone.   The said base material layer consists of a vinyl chloride resin composition, The sticking sheet for headlights in any one of Claims 1-3.   A headlight unit comprising a headlight cover to which the headlight adhesive sheet according to any one of claims 1 to 4 is attached.   A method for cleaning a headlight cover, comprising attaching the headlight adhesive sheet according to any one of claims 1 to 4 to a surface of the headlight cover.   A headlight adhesive sheet comprising a laminate including a base material layer and a pressure-sensitive adhesive layer, wherein at least one of the base material layer and the pressure-sensitive adhesive layer contains a solvent that dissolves the surface of the headlight cover. A method for cleaning a headlight cover, comprising sticking to a surface of the cover.