TWI384435B - A soft touch label with high transparency and anti-glare property and method thereof - Google Patents

Description

Soft translucent label with high transparency and no reflection and preparation method thereof

The invention relates to a high-transparency and non-reflective soft tactile label and a preparation method thereof, which have good extensibility and wear resistance and can be used for marking or decorating objects having curved lines. In addition to the effect of marking the back of the logo, this label can improve the touch of the object and feels soft and suede. This material can be combined with other materials for the outer shell of a variety of products that people can touch with, especially in architectural and decorative materials or in communication and consumer electronics, where there is a need for soft touch and light transmission. The high transparency effect makes the information on the back of the material easy to identify.

It is a known technique to apply a soft touch material to a plastic material for use on products that are often touched by human hands. In order to provide a soft touch (for example, a suede-like soft appearance) on the surface of a plastic molded article or a metal molded article, a coating material such as suede was directly sprayed on the exterior of the molded article.

In Japanese Patent Laid-Open No. Hei 2-12443, it is disclosed that the pigment particles and the ionizing radiation curing resin are used to spray the material onto the film to produce a good effect, which is commonly known as a decorative board. However, this technique requires an ionizing radiation-curable resin composition, and it is necessary to irradiate an electron beam, etc., which becomes complicated and mass production is not satisfactory.

Japanese Patent Laid-Open No. 59-202830, the entire disclosure of which discloses the use of the injection molding technique to form a sheet into a decorative sheet to produce a surface having a soft touch. However, when it is adhered to the surface of the molded part, the curve of the formed part often results in poor interface lap joint. Therefore, Japanese Patent Laid-Open No. Hei 62-251111 proposes a method of first placing a thermoplastic resin sheet in an injection molding die; and then injecting a resin into the mold; thus obtaining a thermoplastic resin sheet (decorative sheet) integrally formed with the injection molded piece, The decorative board and the curved injection molded part will not result in poor interface splicing. However, the soft touch coating is generally applied to a plastic substrate to form a decorative sheet. Since the plastic substrate is not elastic, the curved surface cannot be formed at a low temperature, and the deformation is insufficient even at a high temperature hot press molding. As a result of the inability to deep draw, the freedom of design of the formable components is limited. Therefore, it is different from the substrate-free high-stretch label material in this case.

For the material part, U.S. Patent No. 5,354,397, 1994, Sekisui Co., Ltd., discloses that the use of a foamed layer, an elastic resin and elastic particles causes surface unevenness, and softness can be obtained. A suede-like touch. In 2002, the accumulated water was further proposed to replace the injection molding with extrusion molding, and it was possible to produce a soft-touch decorative panel in a roll-to-roll manner. In 2006, U.S. Patent No. 20060078745, Bayer Bayer also discloses the use of foamed materials, elastic resins and elastic particles to produce a textured surface with a soft touch. This is also a decorative sheet with a soft touch of a plastic substrate, which is different from the substrate-free high-stretch label material in this case.

Traditionally, these materials are mainly used in automotive interior design, so materials with soft touch are usually combined with color materials and used together with other materials. Therefore, the transparency of such decorative panels has never been discussed. With the popularity and lightness and thinness of consumer electronics and displays, the outer shell of portable products must have the soft touch that people like, and the display or display of the built-in pattern design does not affect the transparency of the decorative board. It has become an important feature. However, in the prior art, the transparency of the decorative panel has not been explored or improved, and there is no suggestion or guidance from the prior art, how to improve or control the transparency of the decorative panel, but still retain Its essential soft touch.

In order to further illustrate the technical means and efficacy of the present invention for achieving the intended purpose of the present invention, a high-transparency and non-reflective soft tactile label according to the present invention will be specifically described below with reference to the accompanying drawings and preferred embodiments. The embodiments, structures, method steps, features, and effects thereof are described in detail below.

The foregoing and other objects, features and advantages of the invention will be apparent from Through the description of the specific embodiments, a more in-depth and specific understanding of the technical means and functions taken for achieving the intended purpose of the present invention is provided. However, the drawings are only for reference and explanation, and are not used for The invention is limited.

A high-transparency and soft-touch label of the present invention, as shown in FIG. 1, comprises: a high-transparency soft touch film 1 having a hemispherical shape; a pattern 2 thereon There is a high viscosity adhesive layer 3 above the pattern; the light transmittance of the soft touch film 1 is in the range of 10-50%, the elongation is more than 50%, and the Young's modulus is between 1 MPa and 5 MPa. The high transmittance and soft touch film comprises a transparent elastic resin layer and elastic particles.

Another high-transparency and soft-touch label form of the present invention, as shown in FIG. 2, comprises: a high-transparency and non-reflective soft touch film having a hemispherical shape; There is a transparent adhesive layer underneath; the overall light transmittance of the label ranges from 10 to 50%, the elongation is between 50 and 500%, and the Young's modulus is between 1 MPa and 5 MPa.

In order to achieve the smooth application of various curves and curved surfaces, the structure does not contain a plastic substrate, and a transparent elastic resin is mainly used, and then elastic particles are added to achieve a soft touch effect.

The high-transparency soft touch material is formed into a film label form, and even various patterns can be pre-formed thereon, and then adhered to the surface of the object with an adhesive, so that the object can be easily painted due to the surface shape, or The object has low heat resistance and cannot be coated.

The exposed diameter dp of the hemispherical shape of the elastic particles, the average pitch of the convex points is the Sm value, and the dp/Sm value is between 0.1 and 0.8, and good transmittance has been achieved.

In general, in order to achieve a soft touch, it is necessary to add a large amount of spherical elastic particles to cause the surface to have unevenness. However, since a large amount of particles are added to the resin, the transmittance of the material is largely lowered by scattering. In general, the soft touch materials obtained in the prior art have a transmittance of less than 10%.

The high light transmittance soft touch label of the present invention firstly minimizes the internal light diffusion effect caused by the difference in refractive index between the elastic resins, so the refractive index difference of each material should be less than 0.1 and preferably 0.05. The secondary control of the elastic particles from the roughness Ra of the surface of the material and the distance Sm between the convex points further reduces the external diffusion caused by the uneven surface of the material. This will increase the overall transparency.

The elastic particles protrude from the roughness Ra of the surface of the material to determine the soft touch effect of the material; and then control the distance Sm between the protruding points to achieve a high transmittance, while still maintaining an acceptable soft touch. This can be applied to the in-mold decoration technology, which clearly shows the pattern of the back printing, or the special effect of imitation metal lines and colors, which is the soft touch material with low transmittance in the previous case. Unable to achieve.

The method for controlling the distance Sm between the roughness Ra and the convex point in the present case mainly controls the viscosity of the transparent elastic resin to be coated to achieve different surface characteristics. The viscosity of the transparent elastic resin is determined by the amount of the hardener added and the reaction time.

The high transmittance soft touch film comprises at least 50%-99% transparent elastic resin and 1-50% elastic spherical particles. Inorganic particles, pigments or dyes may be further included to adjust the refractive index, mechanical strength, abrasion resistance, and color of light transmitted through the region. The size of the inorganic particles ranges between 50 nm and 5 μm.

The transparent elastic resin used in the high-transparency soft touch film 1 of the present invention is a thermoplastic or thermosetting resin which exhibits good elongation properties at room temperature, and has an elongation of more than 50%, and Young's modulus is introduced. Between 1MPa and 5MPa.

The transparent elastic resin described above includes polyurethanes, polystyrenes, polyolefins, polyesters, polyvinylchlorides, and polyamides. , Ionomer type, Fluororubber, 1,2-polybutadiene type, Trans 1,4-Polyisoprene and synthetic natural rubber Classes, etc., can be used individually or in combination.

The elastic resin generally comprises: a soft segment molecule which is both a rubber component and has entropy elasticity; and with a hard segment molecule, which has a binding force to prevent plastic deformation, and which may also comprise a crosslinked structure to form a three-dimensional crosslinked network structure, and Both high elongation and high mechanical strength and wear resistance. Thus, the present invention overcomes the disadvantages of the conventional soft touch materials that are poor in mechanical properties and are not resistant to abrasion. Since the prior art has a substrate, the entire material needs to be formed by hot pressing to form a curved surface, so that only a thermoplastic elastic resin can be used.

The hardness of the cured transparent elastic resin is preferably from 20 to 98 in accordance with the hardness standard of JIS K6301A-, and the standard differs depending on the desired softness and the hardness of the elastic particles used.

Specific examples of the above-mentioned urethane-based transparent elastic resin are a block copolymer, the polyurethane is a hard segment, and the polyether, polyester, polycarbonate or the like is a soft segment.

Specific examples of the polystyrene type include block copolymers in which polystyrene is used as a hard segment, and polybutadiene, polyisoprene, and polyethylene-polybutylene are soft segments (referred to as SBS, respectively). SIS, SEBS block copolymer) and block copolymers further hydrogenated or supplemented with additional functional groups.

Specific examples of the polyolefins include those having a polyolefin such as polypropylene as a hard segment and ethylene as a soft segment (abbreviated as EPM (ethylene-propylene-methylene bond)); those having a polyolefin such as polypropylene as a hard segment, A small amount of diene composition together with ethylene as a soft segment (abbreviated as EPDM (ethylene-propylene-diene methylene bond), EPM and EPDM together called EPR (ethylene-propylene rubber), is a mixture of the two And those which are further crosslinked by organic peroxides; and those grafted with unsaturated hydroxy monomers or unsaturated carboxylic acid derivatives; and butyl rubber grafted polyethylene, etc., hard and soft parts, Copolymerization during polymerization or after mixing in a mixed manner.

Specific examples of the polyester type include block copolymers in which polyester is used as a hard segment and a polyether as a soft segment or the like.

Examples of polyvinyl chlorides, including those in which the degree of polymerization of polyvinyl chloride is increased to the extreme (highly linear polymerization of polyvinyl chloride; polymerization degree is between about 2,000 and about 2,500), methods such as three-dimensional crosslinked structures, and ions Crosslinked structure.

Examples of polyamides include those in which the polyamide is used as the hard segment and the polyether is the soft segment.

Choosing an optimal transparent elastomer requires consideration of the specific performance characteristics desired. For example, carbamates are preferred if the desired characteristics include scratch resistance, abrasion resistance, good touch feel and appearance. If good light fastness and heat resistance are required, a non-yellowing aliphatic isocyanate must be used to synthesize the polyurethane.

The conditions for selecting elastic particles are mainly due to the size of the particles, which must be large enough to cause surface irregularities, but too large particles can cause the coating to be brittle. The average particle diameter of the elastic particles is usually between 1 and 50 μm, preferably between 3 and 20 μm.

As the elastic particles used in the present invention, non-natural elastic particles may be used, including polyurethane, hollow polyurethane, silicone particles, acrylic resin (preferably acrylic-polyurethane resin), polystyrene and styrene-isoprene copolymer, and the like. Made of materials. Although it is desirable to use spherical elastic particles, the particles obtained by the freeze pulverization method are generally aspherical shapes and can be used. Generally, the elastic particles are used in an amount of about 20 to 200 parts, preferably 50 to 150 parts, based on 100 parts by weight of the thermoplastic resin. Further, two or more kinds of elastic particles can be used at the same time.

The invention utilizes inorganic particles to adjust the refractive index, mechanical strength and wear resistance of the inorganic particles in the region, and mainly coats cerium oxide, titanium dioxide or hollow cerium oxide. The size of the inorganic particles ranges between 50 nm and 5 μm.

The high-transparency soft touch label 1 can be provided with a protective film 4 on the hemispherical shape surface side, and the low-viscosity rubber material 5 on the protective film; and a release film 6 on the adhesive surface to form an easy-to-preserve And a multi-layered label structure with good operability, as shown in Figure 3. In use, after the label is positioned at the place to be applied, the protective film 4 and the release film 6 are removed, and the label 1 of the high transmittance soft touch as shown in Fig. 1 can be smoothly attached. On various surfaces of objects.

The protective film 4 and the release film 6 can be selected from various common plastic film materials, for example, from polycarbonate, polyacrylic acid, polymethacrylate, polyurethane, polystyrene, polyolefin, polyester. And a group of polyvinyl chlorides.

The low-viscosity rubber compound may be composed of a single layer or a plurality of layers of a rubber compound, wherein one side is excellent in adhesion with the protective film, and the other side has a peeling force on the high-transparency soft touch film 1 of 2 g gravity/25 mm to 400 g. Between gravity / 25 mm (gf / 25mm), and between 10 grams of gravity / 25 mm to 100 grams of gravity / 25 mm, the multi-layer and then the interfacial compatibility and adhesion.

The method for manufacturing a high transmittance and non-reflective soft touch label comprises applying a transparent elastic resin with elastic particles to the release film to form a soft translucent film with high transparency and no reflection, and then The film is transferred to a protective film, and the release film is peeled off before use to protect the film as a carrier, and the soft touch film is transferred to the surface of the object to be attached by using a rubber material, and then the protective film is removed.

Embodiment 1

Please refer to FIG. 3 and FIG. 4 , which are schematic structural diagrams of a semi-finished product of the high light transmittance soft touch label manufacturing process of the present invention. Among them, the high transmittance soft touch film 1 is obtained by the following method.

The above materials are stirred and mixed to obtain a resin formulation, which is a material of the high transmittance soft touch film 1. The material is coated on a temporary substrate, and the temporary substrate used herein is a polyethylene terephthalate (PET) release film (the coated surface has been treated with a Silicone release effect first). The coating layer), after drying at 80 ° C for 15 minutes, formed a 60 micron similar soft touch material. Further, the polyurethane resin A is coated with a transparent resin to cover the surface of the coating to control the Ra and Sm ranges of the unevenness of the surface of the soft touch film, and the coating is about 1 to 2 μm thick. Finally, a high-transparency soft touch film 1 is transferred onto the protective film by a protective film 4 containing a low-viscosity compound 5 to form a semi-finished product as shown in Fig. 5, and the transmittance is 30%.

In this embodiment, Nitto 31B of Nitto Denko is used as a protective film (4 and 5) containing rubber, and the peeling force of the high-transparency soft touch film 1 is 360 g/25 mm (gf/25 mm). ), tested by FINAT-1, the test method of the International Federation of Rubber Manufacturing and Processing.

The high-transparency soft touch film 1 obtained in this example was separately peeled off and subjected to a tensile test in accordance with the American Standard Test Specification ASTM D882 method, and the elongation was 100%, and the Young's modulus was 2.8 MPa.

Embodiment 2

The above materials are stirred and mixed to obtain a resin formulation, which is a material of the high transmittance soft touch film 1. The material was coated on a temporary substrate, and the temporary substrate used herein was a polymethacrylic acid (PMMA) film, which was dried at 80 ° C for 15 minutes to form a 100 μm similar conventional soft touch material. The polyurethane resin B is then coated as a transparent resin over the surface of the coating, which is about 1 to 2 microns thick. Finally, a high-transparency soft touch film 1 is transferred onto the protective film by a protective film containing the compound 5 to form a semi-finished product as shown in Fig. 5, and the transmittance is 40%.

In this embodiment, the Yushan high-viscosity scratch-resistant protective film HS836L1 is used as a protective film (4 and 5) containing rubber, and the peeling force of the high-transparency soft touch film 1 is 70 g/25 mm (gf). /25mm), the test method is FINAT-1.

The soft touch film containing the transparent resin coating B on the surface obtained in this example was separately peeled off, and subjected to tensile test according to the American Standard Test Specification ASTM D 882, the elongation was 250%, and the Young's modulus was 1.5. MPa.

Embodiment 3

The main agent (New Polyurethane resin L60H150) and the hardener (the aliphatic isocyanate H79 from Xinzhengfeng Co., Ltd.) are mixed in proportion, and after stirring at room temperature, the translucent resin is applied to the mixture. On a temporary substrate of 180 μm polycarbonate (50 μm PET film with Silicion release agent), the coating thickness was between 70 μm. The coating was dried under the conditions of 80 ° C for 5 minutes to give samples A, B and C. The surface of A is covered with a transparent resin of about 1 to 2 micrometers thick to obtain A1; the surface of B is covered with a transparent resin of about 2 to 4 micrometers thick to obtain B1; and the surface of B is covered with a layer of about 1 to 2 micrometers thick. The transparent resin gives B2. The results are as follows:

Note:

1.Ra: the average protrusion height of the particles, Sm is the average distance between the particles and the center point of the particles, dp: the exposed diameter of the convex hemisphere; the result of observation under the optical microscope (Olympus optical microscope, Model SIM6) .

2. Open area, which is a percentage of the area where the particle protrusion height is less than 2 μm. This data is obtained by observing the result under an optical microscope and calculating the area by the grid. The calculation area is 125 μm x 93 μm. At 50X).

3. The main agent is the polyurethane resin L60H150 of Xinzhengfeng Company, the hardener is the aliphatic isocyanate H79 of Xinzhengfeng Company, and the hardener content is based on 100 parts of the main agent.

4. Sample E: The main agent is the polyurethane resin L600 of Xinzhengfeng Company, the hardener is the aliphatic isocyanate H79 of Xinzhengfeng Company, and the hardener content is based on 100 parts of the main agent.

5. L, a and b refer to the color coordinates in the UCS color gamut, where the L value refers to the brightness, and the measurement method is performed in accordance with JIS K7105.

Samples F1 to F5 were produced in the above manner. The surface feature data is as follows:

The soft touch is the result of direct touch by 10 people and voting, the degree is 1 to 4, and the degree 4 is the softest and most pleasant. However, sample F5 was considered to be not soft by more than half of the people. Therefore, when dp/Sm is less than 2.5/30 (that is, 0.08), the surface of the material has no soft touch. The light transmittance of the sample A was 16%, and the dp/Sm value was 5/7 (that is, 0.71). It is not the object of the present invention that the transmittance of the material is less than 10% and the pattern of the back surface cannot be fully exhibited. Therefore, the dp/Sm value is maintained between 0.1 and 0.8, so that the overall light transmittance of the material is in the range of 10-50%, that is, it can have both a soft touch and a clear appearance of the back pattern.

Finally, a high-transparency soft touch film 1 is transferred onto the protective film by a protective film containing a low-viscosity compound 5 to form a semi-finished product as shown in Fig. 5, and the transmittance is 40%. The high-transparency soft touch film 1 obtained in this example was separately peeled off and subjected to a tensile test in accordance with the American Standard Test Specification ASTM D 882, which had an elongation of 200% and a Young's modulus of 2.1 MPa.

The low-viscosity compound 5 is a double-layer adhesive, and one layer is excellent in adhesion to the protective film, and the other layer has a peeling force of 290 gf/25 mm on the highly translucent and non-reflective soft touch film 1. The double layer and the rubber interface compatibility and adhesion are good.

Embodiment 4

Using the semi-finished product as shown in FIG. 5 prepared in the first embodiment to the third embodiment, a protective film containing a high-viscosity adhesive 3 is applied on the surface of the high-transparency soft touch film 1, so that it is easy to preserve. And a multi-layered label structure with good operability, such as the high-transparency soft touch label structure shown in FIG. Here, a high-viscosity adhesive 3 is produced using the material of the new comprehensive company HT 7006.

Using the semi-finished product as shown in FIG. 5 prepared in the first embodiment to the third embodiment, the pattern 4 is printed on the surface of the high-transparency soft touch film 1, that is, the image shown in FIG. 6 is formed. Semi-finished products. A release film containing a high viscosity adhesive 3 is attached to the surface of the pattern to form a multi-layer label structure which is easy to store and has good handleability, such as the high-transparency soft touch label structure shown in FIG. . Here, a high-viscosity adhesive 3 is produced using the material of the new comprehensive company HT 7006.

When in use, the label structure of the present technology, as shown in FIG. 4, is positioned at the place to be applied, and the protective film 4 and the release film 6 are removed, so that the high transmittance as shown in FIG. 1 can be smoothly performed. The soft touch label is attached to objects of various curved surfaces.

After the label structure of the present technology is positioned as shown in FIG. 3, after the protective film 4 and the release film 6 are removed, the soft touch of high transmittance as shown in FIG. 2 can be smoothly performed. The label is attached to objects of various surfaces.

The high-transparency soft touch label 1, the surface of which is wear-resistant under the load of 200 g of a circular diameter of 0.75 mm, can be worn more than 5 times without visible damage.

In this way, it is possible to use a simple fit to decorate various surfaces with a pattern, and to have a soft touch and a slip-proof function. The main applications are as desktop decoration, mouse pads and labels.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention. A person skilled in the art can make some modifications or modifications to equivalent embodiments by using the methods and technical contents disclosed above without departing from the technical scope of the present invention. It is still within the scope of the technical solution of the present invention to make any simple modifications, equivalent changes and modifications to the above embodiments.

Embodiment 5

In the method of the third embodiment, a 60 μm thick high-transparent and non-reflective soft touch film 1 is prepared, and the non-concave surface has been pre-printed with the desired pattern, and then 30 μm thick with pressure sensitive adhesive or heat. The sol was adhered to a 0.35 mm thick surface of a polyvinyl chloride (PVC), and the formed multilayer structure was formed into a toy automobile casing by thermoforming. This solves the shortcomings of the coating drying process because of the poor heat resistance of the polyvinyl chloride.

Embodiment 6

In the method of the third embodiment, a 65 μm thick high-transparent and non-reflective soft touch film 1 is prepared, and the non-concave surface has been pre-printed with the desired pattern, and then a 25 μm thick pressure sensitive adhesive will be used. It follows the surface of the perfume bottle with a curved surface. This solves the problem that the three-dimensional surface of the perfume bottle is not easy to apply.

Example 7

An 80-micron thick, high-transparent and non-reflective soft touch film 1 was prepared by the method of Example 3, and then coated with a double-sided adhesive of 30 μm thickness on the surface of the hand tool or stationery to improve the object. The touch and surface are writeable, but the original pattern design of the object is still clearly visible.

1. . . High transmittance soft touch film

2. . . Pattern

3. . . Compound A (high viscosity)

4. . . Protective film

5. . . Compound B (low viscosity)

6. . . Release film

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood.

Fig. 1 is a schematic view showing a label of a soft touch with high light transmittance according to a preferred embodiment of the present invention.

2 is a schematic view showing a label of a soft touch with high light transmittance according to another preferred embodiment of the present invention.

Fig. 3 is a schematic view showing the structure of a high-viscosity soft touch of a preferred embodiment of the present invention.

Figure 4 is a schematic view showing the structure of a high-viscosity soft touch of another preferred embodiment of the present invention.

Figure 5 is a schematic view showing the structure of a semi-finished product of the high-viscosity soft touch label manufacturing process of the present invention.

Figure 6 is a schematic view showing the structure of the semi-finished product containing the high-transparency soft touch labeling process of the present invention.

1. . . High transmittance soft touch film

2. . . Pattern

3. . . Compound A (high viscosity) (high viscosity)

Claims (2)

A high-transparency and non-reflective soft touch label comprising: a high-transparency and non-reflective soft touch film having a concave-convex shape; the soft touch film has a light transmittance ranging from 10% to 50% Between %, the elongation is between 50% and 500%, and the Young's modulus is between 1 MPa and 5 MPa. The high transmittance and non-reflective soft touch film comprises a transparent elastic resin layer and elasticity. The particle has a thickness between 0.02 and 0.1 mm; the exposed diameter (dp) of the hemispherical shape of the elastic particle, the average spacing (Sm value) of the convex point, and the dp/Sm value between 0.1 and 0.8 . The high-transparency and non-reflective soft tactile label as described in claim 1, wherein the high-transparency and non-reflective soft touch film has a flat area of 2 μm or less on the surface of the surface. Between 90%, the thickness is between 15 and 100 microns.