JP4959954B2 - Glass shatterproof sheet for image recording - Google Patents

Description

  The present invention relates to a glass scattering prevention sheet, and more particularly to a glass scattering prevention sheet capable of recording an image.

  The glass scattering prevention sheet has a resin film exhibiting a glass scattering prevention function, an adhesive layer formed on one surface thereof, and a release liner attached to protect the surface of the adhesive layer until use. It is a film laminate. In use, the release liner is peeled off and the surface of the pressure-sensitive adhesive layer is attached to glass. By doing so, even if the glass is broken due to a disaster or the like, scattering of the glass piece is prevented, and secondary damage due to the glass piece is prevented.

  The resin film of the glass scattering prevention sheet is required to have sufficient strength so as not to crack even if the glass is broken. Therefore, a polyester film having a certain thickness or more is generally used as the resin film. For example, Patent Document 1 describes a polyethylene terephthalate film and a glass scattering prevention sheet having an acrylic pressure-sensitive adhesive layer formed on one side thereof.

  Here, on the exposed surface of the polyester film, that is, the surface on which the pressure-sensitive adhesive layer is not formed, radiation that passes through the glass, such as ultraviolet rays, visible rays, and heat rays, is selected according to the use of the glass scattering prevention sheet. A function of blocking or weakening may be added. For example, Patent Document 1 describes that an ultraviolet absorbing layer is provided on the exposed surface of a polyethylene terephthalate film.

  On the other hand, decorative films having various designs have been conventionally used to decorate glass surfaces such as show windows and windows of buildings and vehicles, and glass scattering prevention sheets are also required to have a decorative function.

  The essential function of the decorative design is to differentiate it from others, and its uniqueness is respected. For this reason, there is a great demand for easily printing a small amount of an original design. In response to such a demand, Patent Document 2 describes printing of an image on a light-transmitting adhesive sheet using a computer-controlled printer, and a light-transmitting adhesive sheet for forming a thermal transfer image.

  However, the polyester film as described in Patent Document 1 has poor ink receptivity, and image formation by a printer is difficult. Further, when the glass scattering prevention sheet is wound around a roll, the exposed surface of the polyester film (the surface of the glass scattering prevention sheet) and the exposed surface of the polymer release liner (the back surface of the glass scattering prevention sheet) come into contact. Therefore, when the roll is unwound, both surfaces are peeled off, static electricity is generated, and the exposed surface of the polyester film is charged. When an image is formed on a charged surface by a printer, the image is defective and the image quality is deteriorated.

  In the light-transmitting pressure-sensitive adhesive sheet of Patent Document 2, a polymethyl methacrylate-based film having no ink receiving layer is used as a resin film. Polymethylmethacrylate does not have sufficient strength to realize the glass scattering prevention function.

Patent Document 3 describes an image forming method characterized in that an image is formed on a transparent substrate such as a polyester film having an image receiving layer by a thermal transfer method, and then a coating layer is formed on the image surface. However, the glass scattering prevention function is not described here.
Japanese Patent Laid-Open No. 11-115107 JP2002-19309 JP-A-5-318943

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a glass scattering prevention sheet for image recording capable of forming a high-quality image using a computer-controlled printer. It is in.

The present invention is a polyester film having a glass scattering prevention function;
An image-receiving layer formed on the first surface of the polyester film;
An adhesive layer formed on the second surface of the polyester film; and a polymer antistatic release liner affixed on the surface of the adhesive layer;
The glass scattering prevention sheet for image recording which has this, and the said objective is achieved by it.

  The glass shatterproof sheet for image recording of the present invention is excellent in ink receptivity, hardly generates static electricity when the roll is unwound, and can form a high-quality image using a computer-controlled printer.

  FIG. 1 is a cross-sectional view showing the layer structure of a glass scattering prevention sheet for image recording according to the present invention. The polyester film 1 is a general term for polymer films having an ester bond as the main bond chain of the main chain. Examples of the polyester film 1 include a polyethylene terephthalate film, a polyethylene-2,6 naphthalate film, a polybutylene terephthalate film, and a polybutylene-2,6 naphthalate film. Among these, polyethylene is used in terms of quality and economy. A terephthalate film and a polyethylene-2,6 naphthalate film are most preferred. In particular, a polyethylene-2,6 naphthalate film can be particularly preferably used because it has less oozing of oligomers and the like and can maintain transparency at a high level.

  The thickness of the polyester film 1 is preferably 25 to 500 μm, particularly preferably 38 to 200 μm. When the thickness of the polyester film is less than 25 μm, the glass scattering prevention function is lowered, and when it exceeds 500 μm, the transparency of the film is adversely affected.

  It is preferable that the polyester film 1 contains the ultraviolet absorber as a component. When an ultraviolet absorbing layer is provided on the surface of the film, when applied to the indoor side of the window glass, external light is applied from the pressure-sensitive adhesive layer side, so the effect of the ultraviolet absorbing layer is not fully exhibited, and the deterioration of the polyester film proceeds. This is because there is a risk of it. Further, if an ultraviolet absorbing layer is provided on the surface, there is a possibility that the ink receiving ability at the time of printing is lowered.

  The image receiving layer 2 is a layer that receives ink supplied from a printer and maintains toner and colorant. The image receiving layer is formed of a resin having affinity with ink. A preferred resin for forming the image receiving layer is an acrylic resin. This is because acrylic resin is excellent in affinity with ink, and is excellent in transparency and weather resistance. In particular, a water-based acrylic resin that can be applied with water is preferred. This is because the surfactant used to disperse the acrylic resin in water has an antistatic effect.

  The thickness of the image receiving layer 2 is preferably 5 to 50 μm, particularly preferably 10 to 25 μm. When the thickness of the image receiving layer is less than 5 μm, the adhesion between the ink and the toner is deteriorated, and when it exceeds 50 μm, the coating appearance of the image receiving layer is inferior, and the total thickness of the glass scattering prevention sheet is large. Therefore, the workability is inferior.

  The image receiving layer 2 may contain components other than the acrylic resin as long as the amount does not adversely affect the ink receiving property. Such components include, for example, urethane resins that are antiblocking agents. The content of components other than the acrylic resin is 25% or less, preferably 15% or less.

  The image receiving layer 2 is formed by dissolving a solid component such as an acrylic resin in a liquid medium such as water or dispersing it into a resin composition, applying this to one side of a polyester film, and then drying the liquid medium. Just do it. A method for applying the resin composition is not particularly limited, and a normal layer forming method such as a gravure printing method, a screen printing method, a roll coating method, and a knife coating method may be used.

  The pressure-sensitive adhesive layer 3 refers to a layer for attaching the polyester film 1 to glass. The pressure-sensitive adhesive layer is formed of a transparent pressure-sensitive adhesive. As the pressure-sensitive adhesive, for example, natural rubber-based, butyl rubber-based, isobutyl rubber-based, SBR-based, acrylic (acid ester) -based, silicone-based, thermoplastic elastomer, and the like can be used. Among these, a curable acrylic pressure-sensitive adhesive is preferable in terms of weather resistance and the like.

  The thickness of the pressure-sensitive adhesive layer 3 is preferably 5 to 50 μm, particularly preferably 10 to 40 μm. If the thickness of the pressure-sensitive adhesive layer is less than 5 μm, the glass scattering prevention effect may be insufficient. If the glass is broken, the glass is detached from the film, which is not preferable. When the thickness of the pressure-sensitive adhesive layer exceeds 50 μm, the coating appearance may be deteriorated or the film and the glass may be displaced.

  Further, an ultraviolet absorber can be added to the pressure-sensitive adhesive layer 3 for the purpose of improving the weather resistance. The addition amount of the ultraviolet absorber is preferably 0.2 to 50 parts by weight, more preferably 0.5 to 30 parts by weight with respect to the pressure-sensitive adhesive. If there is too much UV absorber, coloring and aggregation may occur.

  The pressure-sensitive adhesive layer 3 may be formed by dissolving the pressure-sensitive adhesive in a solvent such as ethyl acetate or dispersing it into a resin composition, applying this to one side of the polyester film, and then drying the solvent. The method for applying the resin composition is not particularly limited, and a known coating method such as reverse roll coating, gravure roll coating, slit die coating, kiss coating, knife coating, or the like may be used.

  The release liner 4 is a layer temporarily attached to protect the surface of the pressure-sensitive adhesive layer until the glass scattering prevention sheet is attached to the glass. As the release liner 4, a polymer antistatic release liner is used.

  It is preferable to keep the surface of the pressure-sensitive adhesive layer as smooth as possible so as not to disturb the transparency of the glass even after being attached to the glass. Therefore, a polymer film having excellent smoothness is used for the release liner.

If the release liner does not have antistatic properties, as described above, the image receiving surface of the polyester film is charged when the roll of the glass scattering prevention sheet is unwound. As a result, when image formation is performed by a printer, non-uniformity, omission, etc. occur in the image, and the image quality deteriorates. In addition, conveyance failure and film wrinkling are likely to occur while passing through the printer. The surface resistance value of the antistatic release liner is preferably 10 ¹² Ω or less, particularly preferably 10 ¹⁰ Ω or less, from the viewpoint of the antistatic effect.

  The material of the release liner 4 is not particularly limited as long as it is a polymer excellent in the smoothness of the surface in contact with the pressure-sensitive adhesive layer, but usually a polyethylene terephthalate sheet or polypropylene sheet having a thickness of about 5 to 100 μm is preferably used. In the release liner 4, a release agent layer (not shown) made of a silicone resin having a thickness of about 0.01 to 2 μm is provided on the surface in contact with the pressure-sensitive adhesive layer.

  As a method for imparting antistatic properties to the release liner 4, for example, a method in which an antistatic agent is kneaded into the base sheet, and a method in which a coating layer containing an antistatic agent is provided between the base sheet and the release agent layer. A method of providing a coating layer containing an antistatic agent on the surface opposite to the release agent layer of the substrate sheet can be exemplified. Examples of the antistatic agent include nonionic antistatic agents, anionic antistatic agents, cationic antistatic agents, amphoteric antistatic agents, organic electron conductive compounds, and conductive fine particles. Among these, quaternary ammonium salts, which are a kind of cationic antistatic agent, are preferable from the viewpoint of effects.

  Examples of quaternary ammonium salts include lauryl trimethyl ammonium chloride, lauryl dimethyl benzyl ammonium chloride, cetyl pyridinium chloride, cetyl pyridinium bromide, stearamide methyl pyridinium chloride, lauryl trimethyl ammonium methosulfate and the like. Examples of the polymer quaternary ammonium salt include a quaternary ammonium salt type styrene polymer and a quaternary ammonium salt type aminoalkyl (meth) acrylate polymer. Specific examples include polyvinylbenzyltrimethylammonium chloride, quaternized polydimethylaminoethyl methacrylate, polydiallyldimethylammonium chloride, and the like. In the case of providing a coating layer containing these antistatic agents, a method is generally used in which an appropriate organic polymer compound and an aqueous coating solution containing the antistatic agent are prepared, applied to a substrate sheet, and dried. The thickness of this coating layer is generally about 0.005 to 5.0 μm.

  The glass scattering prevention sheet for image recording of the present invention is a decorative glass scattering prevention sheet by recording an image on the surface (image receiving surface) of the image receiving layer. The image recording method is not particularly limited as long as it can be performed by a computer-controllable printer. For example, a thermal transfer printing method, an electrostatic printing method, an ink jet printing method, or the like is employed. In particular, the thermal transfer printing method is preferable because large-size and high-quality images can be recorded at low cost. Further, the thermal transfer printing method is particularly susceptible to the effect of charging of the image receiving surface and imparting antistatic properties to the release liner.

  FIG. 2 is a schematic view showing an example of a method for producing a decorative glass scattering prevention sheet of the present invention. The glass sheet for preventing image scattering for image recording is once wound up on a roll after storage and stored. The glass scattering prevention sheet 5 is supplied to the printer 7 while unwinding the roll 6. After the image formation, the decorative glass scattering prevention sheet 8 discharged from the printer is laminated with a transparent film 9 on the image receiving surface when image protection is required. The resulting laminated film is cut into appropriate dimensions by the cutter 10. This laminated film may be wound on a roll again instead of being cut.

  FIG. 3 is a cross-sectional view showing the layer structure of the decorative glass scattering prevention sheet of the present invention. A part of the colored region 11 is present in the image receiving layer 2 to form an image. The image formed on the image receiving layer is protected by the transparent film 9.

  The following examples further illustrate the present invention, but the present invention is not limited thereto.

  After drying an aqueous acrylic resin solution (“NeoCryl XK90” manufactured by AVECIA) on a 50 μm thick polyester film (“HB-3-50” manufactured by Teijin Limited) kneaded with an ultraviolet absorber. The film was coated to a thickness of 20 μm and dried at 90 ° C. for 5 minutes to form an image receiving layer.

  An acrylic pressure-sensitive adhesive prepared by dissolving an isooctyl acrylate (IOA) / acrylic acid (AA) copolymer (weight average molecular weight 560,000, Tg-7 ° C.) having a composition ratio of 90:10 (mass ratio) in ethyl acetate is prepared. did.

  A pressure-sensitive adhesive composition of acrylic pressure-sensitive adhesive / bisamide-based crosslinking agent / ultraviolet absorber = 100: 0.21: 2 (solid content ratio) was prepared, and the surface opposite to the image receiving layer of the polyester film was coated with a knife coat. It applied so that the thickness after drying might be set to 23 micrometers. A pressure-sensitive adhesive layer was formed by heating at 90 ° C. for 5 minutes, followed by drying and crosslinking.

  The surface of the pressure-sensitive adhesive layer was surface protected with an antistatic silicon-treated polyester sheet (“SP-PETA-01-75-BU” manufactured by Tosero Co., Ltd.) to obtain a glass scattering prevention sheet for image recording.

  The obtained film was rolled up, and static electricity generated between the image receiving layer and the release liner was examined using a static electricity meter (“KSD-6110” manufactured by Kasuga). When the film was pulled out by hand, the generation of static electricity was suppressed to 0.4 kV even when the film was pulled out at 0.1 kV and 60 cm / min, and the unwinding property was good.

  This film had a glass scattering prevention function defined in JIS A5759. When the haze and transmittance were measured with a haze measuring instrument (“SZ-Σ90 Color Meter” manufactured by Nippon Denshoku Co., Ltd.), they were 0.9 and 93%, respectively, and had good transparency as a glass scattering prevention sheet. It was.

  Next, a transfer digital image was formed with pigment toner on transfer media (3M “Trident”) using an electrostatic printer (“Scotch Print 2000 System” manufactured by 3M). Next, the image was thermally transferred to the image receiving layer of the glass scattering prevention sheet for image recording with a heat laminator (“Orca III” manufactured by 3M). The setting conditions of the heat laminator were an upper roll temperature of 135 ° C., a lower roll temperature of 50 ° C., a speed of 60 cm / min, and a pressure of 60 psi.

  Remove the transfer media paper carrier, and laminate a transparent protective film with adhesive ("SP4815" polyester-based overlaminate film made by Sumitomo 3M) on the image-receiving layer on which the image is formed to prevent the decorative glass from scattering A sheet was prepared.

  In place of water-based acrylic resin, water-based acrylic resin (“Neocryl XK90” manufactured by Avicia) and water-based urethane resin (“NeoRez R989” manufactured by Avicia®) are mixed at 90 parts by mass (solid content ratio). A glass scattering prevention sheet for image recording was prepared in the same manner as in Example 1 except that the used resin was used.

  When this film was wound into a roll and the static electricity generated between the image receiving layer and the release liner was measured, it was 0.1 kV when the film was pulled out by hand, and 0.4 kV even when the film was pulled out at 60 cm / min. Generation was suppressed, and the unwinding property was good.

  The receptor film had a glass scattering prevention function defined in JISA5759. The haze and transmittance were 1.2 and 92%, respectively, and they had good transparency as a glass scattering prevention sheet. The toner image transfer performance was also good.

Comparative Example 1

  A glass scattering prevention sheet for image recording was prepared in the same manner as in Example 1 except that a silicon-treated polyester sheet (“SP-PET-01-25-BU” manufactured by Tosero Co., Ltd.) that was not subjected to antistatic treatment was used as a release liner. did.

  When this film was wound into a roll and the static electricity generated between the image receiving layer and the liner was measured, the static electricity was substantially 9.4 kV when the film was pulled out by hand and 14.4 kV when the film was pulled out at 60 cm / min. The unwindability was poor.

Comparative Example 2

  A glass scattering prevention sheet for image recording was prepared in the same manner as in Example 1 except that a PVC film with an adhesive (“Scotch Print SP4582” manufactured by Sumitomo 3M) was used instead of the polyester film and the adhesive layer. This film had haze and transmittance of 25 and 93%, respectively, and had good transparency as a glass scattering prevention sheet.

  However, this film did not satisfy the glass scattering prevention function defined in JIS A5759.

Comparative Example 3

  A glass scattering prevention sheet for image recording was prepared in the same manner as in Example 1 except that a transparent acrylic film (“Acryprene” manufactured by Mitsubishi Rayon Co., Ltd.) having a thickness of 50 μm was used instead of the polyester film. This film had haze and transmittance of 03 and 93%, respectively, and had good transparency as a glass scattering prevention sheet.

  However, this film did not satisfy the glass scattering prevention function defined in JIS A5759.

[Table 1]
Film composition and performance list

The decorative glass scattering prevention sheet of the present invention can be suitably used by being attached to glass as a heat transfer image recording transparent adhesive film having good transparency and little image distortion. In addition, since the single layer has a scattering prevention function, the product cost can be reduced.
Effects such as design, sandblasting, and blindfolding can be easily imparted to the glass substrate by using white toner in the decorative glass scattering prevention sheet of the present invention.
Further, the decorative glass scattering prevention sheet of the present invention can be used as an image structure to which functionality is imparted by combining a self-cleaning film, a metal vapor-deposited film, an insect-proof film, an infrared cut film, a mat film, and the like.

It is sectional drawing which shows the layer structure of the glass scattering prevention sheet for image recording of this invention. It is a schematic diagram which shows an example of the manufacturing method of the decoration glass scattering prevention sheet | seat of this invention. It is sectional drawing which shows the layer structure of the decoration glass scattering prevention sheet | seat of this invention.

Explanation of symbols

1 ... polyester film,
2 ... Image receiving layer,
3 ... adhesive layer,
4 ... peeling liner,
5: Glass scattering prevention sheet for image recording.

Claims (4)

Polyester film having glass scattering prevention function;
An image-receiving layer formed on the first surface of the polyester film;
An adhesive layer formed on the second surface of the polyester film; and a polymer antistatic release liner affixed on the surface of the adhesive layer;
A glass scattering prevention sheet for image recording ,
A glass scattering prevention sheet for image recording, wherein the image receiving layer is a resin layer comprising a water-based acrylic resin. The polymeric antistatic release liner has a release layer on a surface in contact with the adhesive layer, according to claim 1 is a polyester film having an antistatic layer on the surface not in contact with the pressure-sensitive adhesive layer A glass scattering prevention sheet for image recording. The step of preparing a roll of the glass scattering prevention sheet for image recording according to claim 1 or 2 ;
Supplying the glass scattering prevention sheet to the printer while unwinding the roll; and forming an image on the image receiving layer of the glass scattering prevention sheet by the printer;
A method for producing a decorative glass scattering prevention sheet. The method of claim 3, wherein the printer is a thermal transfer printer.

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