JP2780034B2 - How to apply uneven patterns - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for imparting a concavo-convex pattern, which is a fine precision concavo-convex pattern that emits brilliant color or a matte grain pattern and has excellent scratch resistance. The present invention relates to a method for providing a concavo-convex pattern capable of forming a concavo-convex pattern.

[Problems to be solved by conventional technology and invention]

As a method of imparting design properties to the surface of a sheet or the surface of an object having a three-dimensional shape, a sandblast method of spraying fine powder onto the surface of the sheet or the object to roughen the surface, embossing pressing an embossing roll directly on the surface. A method, a method of applying a transparent paint on the surface in a fine uneven shape, a casting method using a mold having a fine uneven shape on the surface, a method of including a matting agent in a synthetic resin film, and a paint containing a matting agent on the surface. Many methods are known, such as a method of applying.

However, in these methods, the surface hardness is poor and easily scratched, and the solvent resistance and chemical resistance are poor,
Alternatively, there is a problem in that one or more of the defects such as the fact that the formed irregularities are not fine and sharp cannot be obtained, or that the formed irregularities have poor shape retention.

As a method for overcoming these drawbacks, a method using an ionizing radiation-curable resin has been used. In this method, an uncured ionizing radiation-curable resin is applied to the surface of a base material, and then the resin is cured by irradiating with ionizing radiation after applying irregularities to the surface using a shaping film or an embossing roll. , To provide an uneven shape. The concavo-convex design obtained by this method is excellent in abrasion resistance and can express a fine concavo-convex pattern, which is an extremely excellent method, but air is taken in when the concavo-convex shape is applied by a shaping film or an embossing roll. However, there is a problem that a part of the uneven shape is deformed as a result, and there is still room for improvement.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for imparting an excellent concavo-convex pattern that has solved the above-mentioned disadvantages of the prior art.

[Means for solving the problem]

The transfer foil of the present invention has the following configuration to solve the above problems.

The present invention provides (1) a method for imparting a concavo-convex pattern, which comprises sequentially performing the following steps: (a) a height difference between a convex portion and a concave portion on the surface is 0.1 to 90 μm; The pitch of the recess is 0.1-1
A step of preparing a shaped film having parallel-line fine irregularities of 00 μm and a releasability with a cured product of the ionizing radiation-curable resin.

(B) a step of applying an ionizing radiation-curable resin to both sides of the irregularities of the shaped film.

(C) a step of laminating a shaped film having the uncured ionizing radiation-curable resin applied to the surface of the substrate so that the ionizing radiation-curable resin is in contact with the substrate.

(D) a step of irradiating with ionizing radiation, curing the ionizing radiation-curable resin, and bonding the resin to the substrate, and then removing the shaped film.

(2) Fine irregularities on the surface of the shaped film have a height difference of 0.1
(1) The method for providing a concavo-convex pattern according to the above (1), wherein the concavo-convex pattern has a grain size of about 90 μm and a pitch width of the convex part or the convex part or the concave part and the concave part of 0.1 to 100 μm.

In the method of the present invention, first, a shaped film is prepared. The shaping film 1 in the present invention comprises a shaping layer 2 alone as shown in FIG. 1 (a), or a laminate of the shaping layer 2 and a support film 3 as shown in FIG. However, it is composed of a laminate of two or more support films and a shaping layer. Further, the surface of the shaping layer 2 is provided with parallel line fine unevenness and grain-like fine unevenness 4. In FIG. 2, reference numeral 5 denotes an adhesive layer.

As shown in FIG. 3, the parallel linear fine unevenness 4 has a depth h of 0.
1 to 90 μm, and the pitch d is 0.1 to 100 μm. The uneven design provided by having such a depth and a pitch becomes a beautiful one that emits an iris color by oblique light. The desirable design of the parallel straight line or curve group consists of a set of areas surrounded by closed curves as shown in FIG. 4, where the parallel lines in the same area have the same direction, and the gloss characteristic of the parallel lines is unique. The iris color appears as the shape of the region. More desirably, the directions of the parallel line groups in the area adjacent to each other via the side are preferably different from each other as shown in FIG. 4. In this case, at least four types of parallel line groups are required. Further, in order to clarify the gloss difference between adjacent areas, the angle difference between adjacent areas is desirably 5 ° or more. In this case, four or more different glosses depending on the viewing direction,
An iris pattern is observed. Also, it is desirable to provide a bank portion without a parallel line group between the regions in order to clarify the difference in gloss from an adjacent region, and from the viewpoint of positional deviation error and absorption when creating a parallel line group. . The fine grained irregularities 4 have a depth h of 0.1 to 90 μm and a pitch d of 0.1 to 100 μm.
A μm hemisphere, pyramid, prism, or similar projections are arranged in a plane, and have the purpose of matting the surface and preventing slippage.

As the material of the imprinting layer and the support film constituting the imprinting film, polyester, polyethylene, polypropylene, polyolefin such as polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polycarbonate, polyamide, polystyrene, ethylene-vinyl acetate copolymer Synthetic resins such as coalesced resins, and fluororesins such as Teflon and polyvinylidene fluoride can be used, and a laminate of these or a laminate of these and paper can also be used as the support film. Silicone on the surface to improve mold release if necessary
A release coating containing waxes or the like may be coated.

The application of the concavo-convex shape to the shaping film can be performed by a known method, for example, by heating an embossing roll using an embossing plate, an etching method, a mill extrusion method, an electroforming method or the like. Alternatively, a high frequency embossing method using an embossing plate prepared in the same manner may be used. Alternatively, the resin may be formed by applying, casting, or extrusion coating a resin on a sheet, plate, or roll having an uneven shape when forming a shaped film, and then releasing the resin after curing.

Next, in the present invention, an ionizing radiation-curable resin is applied to the shaped film. For example, as shown in FIG. 1 (b), the ionizing radiation-curable resin 6
Is applied.

Here, ionizing radiation refers to an electromagnetic wave or a charged particle beam having the ability to ionize a substance.There are various types, but industrially usable ones are ultraviolet rays or electron beams. Gamma rays can also be used. Examples of the ionizing radiation-curable resin include prepolymers or oligomers having an ethylenically unsaturated bond in the molecule, such as unsaturated polyesters, polyester acrylates, epoxy acrylates, urethane acrylates, polyether acrylates, polyol acrylates, melamine acrylates and the like. One or more of various acrylates, polyester methacrylate, polyether methacrylate, polyol methacrylate, and various methacrylates such as melamine methacrylate, and a monomer having an ethylenically unsaturated bond in a molecule, for example,
Styrene-based monomers such as styrene and α-methylstyrene, and acrylic acids such as methyl acrylate, 2-ethylhexyl acrylate, methoxyethyl acrylate, butoxyethyl acrylate, butyl acrylate, methoxybutyl acrylate, and phenyl acrylate Esters,
Ethyl methacrylate, propyl methacrylate, methoxyethyl methacrylate, ethoxymethyl methacrylate, phenyl methacrylate, methacrylic acid esters such as lauryl methacrylate, unsaturated carboxylic acid amides such as acrylamide and methacrylamide, acrylic acid-2-
(N, N diethylamino) ethyl, methacrylic acid-2-
(N, N dimethylamino) ethyl, acrylic acid-2- (N, N
Substituted aminoalkose esters of unsaturated acids such as -dibenzylamino) ethyl, (N, N-dimethylamino) methyl methacrylate, 2- (N, N diethylamino) propyl acrylate, ethylene glycol diacrylate,
Propylene glycol diacrylate, neopentyl glycol diacrylate, 1,6-hexanediol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, dipropylene glycol diacrylate, ethylene glycol acrylate, propylene glycol dimethacrylate, diethylene glycol dimethacrylate, etc. Polyfunctional compounds,
And / or a coating composition obtained by mixing a polythiol compound having two or more thiol groups in a molecule, for example, trimethylolpropanetrithioglycolate, trimethylolpropanetrithiopropylate, pentaerythritol tetrathioglycol, and the like. It is formed by

The coating composition is obtained by arbitrarily mixing the above compounds. In order to impart ordinary coating suitability to the composition, the prepolymer or oligomer is added in an amount of 5% by weight or more. It is preferable that the content of the monomer and / or polythiol is not more than 95% by weight.

The above ionizing radiation-curable resin can be coated by any coating method such as a blade coating method, a gravure coating method, a rod coating method, a knife coating method, a reverse roll coating method, a spray coating method, an offset gravure coating method, and a kiss coating method. The gravure coating method, reverse roll coating method, offset gravure coating method and the like, which are excellent in accuracy of the coating thickness, smoothness of the coating surface, etc., are particularly preferable.

In addition, if the amount of the ionizing radiation-curable resin is too small, sufficient surface hardness and abrasion resistance cannot be obtained.If the amount is too large, the curing speed decreases or distortion such as curling of the shaped film at the time of curing occurs. since occurs, 0.5~100g / m ^2, is particularly from 2 to 40 g / m ² is preferred.

The process of applying ionizing radiation-curable resin to such uneven surfaces takes in air more than the conventional method of laminating a shaped film on the ionizing radiation-curable resin applied to the substrate surface. And there is no possibility that the resulting uneven surface will be deformed.

Next, in the present invention, a shaped film having an uncured ionizing radiation-curable resin applied to the surface of the substrate is laminated so that the ionizing radiation-curable resin is in contact with the substrate. For example, as shown in FIG. 1 (c), the shaped film 1 is abutted and laminated so that the ionizing radiation-curable resin 6 is in contact with the surface of the substrate 7. Further, in order to prevent air from remaining in the uneven portion of the shaped film generated during application of the ionizing radiation-curable resin, the applied resin is adjusted to have a low viscosity, preferably 2000 CPS or less.
For that purpose, the composition of the ionizing radiation-curable resin is mainly composed of a low-viscosity monomer, or is diluted with a volatile diluting solvent, or the viscosity is reduced by heating a paint, a shaped film, an atmosphere, or the like. Although there is a method for drying the solvent, the need for exhaust equipment and the like is unnecessary, prevention of bubbles generated in the ionizing radiation curable resin by the residual solvent, because it is advantageous in preventing solvent attack on the base material, It is desirable to use a low viscosity type paint without solvent.

The substrate in the present invention can be applied not only to ordinary synthetic resin, paper, and other sheets, but also to a substrate having a flat or three-dimensional shape.

Next, the substrate is irradiated with ionizing radiation to cure the ionizing radiation-curable resin and adhere to the substrate, and then the shaping film is removed, whereby the substrate surface can be provided with an uneven shape.

For example, as shown in FIG. 1 (c), ionizing radiation 8 is irradiated from the side of the shaped film to cure the ionizing radiation-curable resin 6, and then the shaped film 1 is peeled off as shown in FIG. 1 (d). Then, an uneven pattern 9 is formed on the surface of the substrate 7.

〔Example〕

 Hereinafter, the present invention will be described in more detail with reference to examples.

Example 1 A polypropylene film having a thickness of 25 μm was formed by a hot roll embossing method with a maximum unevenness of 35 μm and a pitch width of 5 μm.
A grain-shaped unevenness of about 70 μm was provided to obtain a shaped film.
An ultraviolet-curable resin paint (manufactured by Dainichi Seika Kogyo Co., Ltd .: Seika Beam PHC, polyester acrylate) was applied to the uneven surface of the shaped film to a thickness of 25 μm by a roll coating method. This laminated film was laminated on a surface of a 100 μm-thick polyester film (manufactured by Toray: T-60) so that an ultraviolet-curable resin paint was in contact with the polyester film.

After that, it passes under three ozone generating ultraviolet lamps of output 160W / cm at a speed of 20m / min and irradiates ultraviolet rays from the polypropylene film side to cure the ultraviolet curable resin paint, and after curing, the polypropylene film is cured. By peeling off, a film having grain-like irregularities on the surface was obtained.

The surface of the obtained film has a reflection gloss value of 23.5, a matte surface, and # 0000 steel wool.
Scratch resistance test result by rubbing 10 times is also good,
In addition, there was no gloss change due to the rubbing scratches.

Example 2 In Example 1, a diameter 1c was used instead of the grain as shown in FIG.
Within a closed curve area around m, there is a groove-shaped parallel line group having a depth of 5 μm and a pitch of 20 μm, and the angles between the parallel line groups are 0 ° (reference), 30 °, 60 °, and 90 °. Irregularities such that the angles of the parallel lines adjacent to each other through the sides are all different are imparted to the shaped film, coated in the same manner as in Example 1, and 150 mm in diameter.
Was wrapped on the outer peripheral surface of the acrylic resin cylinder through a coating surface, irradiated with the same ultraviolet lamp as in Example 1 from the shaped film side, and the shaped film was peeled off.

The surface of the obtained cylinder had a design in which the gloss in each region changed depending on the viewing direction, and the scratch resistance was as good as in Example 1.

〔The invention's effect〕

As described above, according to the method of the present invention, it is possible to provide the irregularities according to the shaped film to be formed, and it is possible to form a fine irregular pattern having excellent scratch resistance. Furthermore, the method of the present invention employs a step of applying an ionizing radiation-curable resin on both sides of the irregularities of the shaped film, thereby laminating the shaped film to the conventional ionizing radiation-curable resin applied to the substrate surface. As compared with the method of forming unevenness by using an embossing roll or the like, there is obtained an effect that air is hardly taken in and there is no possibility that the formed uneven surface is deformed.

[Brief description of the drawings]

FIG. 1 is an explanatory view for explaining the method of the present invention, FIG. 2 is a longitudinal sectional view showing a shaped sheet, FIG. 3 is an explanatory view for explaining an uneven surface, and FIG. 4 is composed of parallel line groups having different angles. It is a principal part enlarged view which shows the fine unevenness | corrugation which was performed. DESCRIPTION OF SYMBOLS 1 ... Shaped film 4 ... Fine parallel line unevenness 6 ... Ionizing radiation curable resin 7 ... Base material 8 ... Ionizing radiation 9 ... Uneven pattern

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // C08J 7/00 305 C08J 7/00 305 (72) Inventor Hideo Goto 1-1-1 Kagamachi, Ichigaya-cho, Shinjuku-ku, Tokyo Dai Nippon Printing Co., Ltd. (72) Inventor Hiroshi Tanaka 1-1-1, Ichigaya Kagacho, Shinjuku-ku, Tokyo Dai Nippon Printing Co., Ltd. (56) References JP-A-59-24729 (JP, A) 57-122969 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B05D 5/06 B05D 3/06 B32B 27/16 B44C 1/20 C08J 7/00

Claims (2)

(57) [Claims] 1. A method for imparting a concavo-convex pattern, which comprises sequentially performing the following steps: (a) a height difference between a convex portion and a concave portion on the surface is 0.1 to 90 μm; Pitch width 0.1-1
A step of preparing a shaped film having parallel-line fine irregularities of 00 μm and a releasability with a cured product of the ionizing radiation-curable resin. (B) a step of applying an ionizing radiation-curable resin to the uneven surface side of the shaped film. (C) a step of laminating a shaped film having the uncured ionizing radiation-curable resin applied to the surface of the substrate so that the ionizing radiation-curable resin is in contact with the substrate. (D) a step of irradiating with ionizing radiation, curing the ionizing radiation-curable resin, and bonding the resin to the substrate, and then removing the shaped film. 2. The uneven pattern according to claim 1, wherein the fine irregularities on the surface of the shaped film are in a grain shape with a height difference of 0.1 to 90 μm and a pitch width between the convex portions and the convex portions or the concave portions and the concave portions of 0.1 to 100 μm. Assignment method.