JP3370382B2 - Manufacturing method of plastic patterned board - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has a plastic pattern in which the pattern is not visible when viewed from a specific direction and exhibits the characteristics of a transparent plate, and the pattern can be confirmed when viewed from other directions. Regarding the board.

[0002]

2. Description of the Related Art Conventionally, a patterned frosted glass or template glass has been known as a patterned plate made of a transparent plate composed of an opaque part and a transparent part, and a plastic plate has a pattern on a transparent resin plate surface. It is known that a shaped opaque resin is laminated. Further, Japanese Patent Application Laid-Open No. 64-40946 discloses a method for producing a patterned plate by molding at least two kinds of photopolymerizable monomers or oligomers into a plate shape and applying a mask with a pattern to perform photopolymerization. Has been done.

[0003]

However, among the above-mentioned manufacturing methods, the glass manufacturing method has a drawback that the manufacturing method is complicated and expensive, and the manufacturing method of the patterned plate using the photopolymerization method is It is difficult to select a combination in which the monomers or oligomers to be mixed have good compatibility, and it is difficult to produce a patterned board if the combination is incorrect.

[0004]

SUMMARY OF THE INVENTION The present invention comprises at least one
A plate-like body of the type of polymer (A) (excluding the oligomer) and the transparent composition comprising at least one photopolymerizable monomer (B), and the scattered light in a state of applying a patterned containing mask Light scattering with a viewing angle dependency, which consists of irradiating and then irradiating parallel light without the mask, or irradiating parallel light with the mask on and then irradiating scattered light without the mask. A method of manufacturing a plastic patterned plate in which a pattern composed of a transparent portion and a transparent portion is formed.

The transparent resin composition used in the practice of the present invention is composed of a mixture of the polymer (A) and the monomer (B), and therefore, compared with a composition comprising a combination of an oligomer and a monomer, It is possible to adjust the viscosity, and particularly when the viscosity of the composition is set to the order of 10 ⁴ poise to 10 ⁵ poise, it is possible to continuously produce a plate-shaped body having a desired thickness using this composition. is there. Due to the gel effect during photopolymerization of the resin composition, the polymerization time of the resin composition can be shortened.
Since the polymerization shrinkage of the plate-shaped resin composition can be reduced, it is possible to form a plate-shaped body having a desired accurate pattern, and there are many excellent advantages.

As the polymer (A) which is a constituent component of the composition used in the present invention, acrylic polymers such as polymethylmethacrylate, polystyrene and its derivatives, and polyhalogenated olefins such as polyvinylidene fluoride are used. Etc. can be mentioned.

The photopolymerizable monomer (B) used in the present invention
Examples of the acrylic monomer include methyl methacrylate, a styrene monomer, and a crosslinkable monomer such as ethylene glycol dimethacrylate and divinylbenzene, but are not limited thereto. Absent.

It is necessary to add an appropriate amount of a photopolymerization initiator to the resin composition used in the present invention. Examples of the photopolymerization initiator include benzophenone, Michler's ketone, thioxanthone and 1-hydroxycyclohexyl. Examples thereof include phenyl ketone. Examples of the scattered light emitting light source used in the present invention include a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a low-pressure mercury lamp, a xenon lamp, a metal halide lamp, a carbon arc lamp, and the like. The light from these light sources may be converted into parallel light through a collimation lens.

When the plate-like material of the above-mentioned transparent resin composition is irradiated with diffused light, the scattered light-irradiated portion is transparently cured,
On the other hand, the portion of the plate-shaped object irradiated with the parallel light becomes a light scattering portion having a visual angle dependency. The part becomes transparent to the plate-like object in the same direction as the parallel light irradiation direction, but when viewed from a direction having an angle to this light irradiation axis, this part becomes a light scattering part. Therefore, when the patterned plate made according to the present invention is used as a window glass with a display unit, it is possible to visually recognize the display unit when viewed from the outside without reducing the amount of light taken in from the outside. It has a great feature.

The present invention will be described in more detail with reference to the following examples.

[0011]

Example 1 A resin mixture of 50 parts by weight of polymethyl methacrylate, 50 parts by weight of benzyl methacrylate, and 0.5 parts by weight of 1-hydroxycyclohexyl phenyl ketone was heated and kneaded at 70 ° C., and then extruded from a nozzle to obtain a plate-like composition of 500 μm. did. Apply a photomask as shown in Fig. 1 to this,
Parallel light was radiated from a parallel light beam type irradiation device with a built-in ultra-high pressure mercury lamp and a collimation part to form a light-scattering part by curing the part corresponding to the transparent part of the photomask (irradiation intensity; 50 mW / cm ² , Irradiation time 1 minute). Next, the photomask was removed from the surface of the plate-shaped resin composition, and the light from the radiant light section of the light irradiation device was irradiated as ultraviolet light through the diffuser plate to cure the remaining part. (Irradiation intensity; 20 mW / cm ² , irradiation time 2 minutes). The part irradiated with parallel light is opaque, and the part irradiated with diffused light has a transparent patterned plastic plate. When viewed from the optical axis direction of parallel light, it is a substantially transparent plate. When tilted a little from the optical axis, the parallel light irradiation part became opaque.

[0012]

Comparative Example 1 A resin mixture comprising 50 parts by weight of methyl methacrylate, 50 parts by weight of benzyl methacrylate and 0.1 part by weight of 1-hydroxycyclohexyl phenyl ketone was added to 500 μm.
It was poured between glass plates sandwiching a spacer of m, covered with a photomask as shown in FIG. 1, and first, by using the same apparatus as in Example 1, parallel light was irradiated to cure. (Irradiation intensity; 50 mW / cm ² , irradiation time 3 minutes). Next, the photomask was removed, and scattered light was irradiated through the diffusion plate to cure all parts of the plate-like material (irradiation intensity; 20 mW / cm ² , irradiation time 5 minutes). This cured product was entirely transparent and a patterned plate could not be manufactured.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a photomask used in the present invention.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-64-40946 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G02B 5/00 G02B 5/02

Claims (2)

(57) [Claims] 1. At least one polymer (A) and at least one photopolymerizable monomer (B) (excluding oligomers ).
After irradiating scattered light under the condition that a mask with a pattern is applied to a plate-like body of a transparent composition consisting of ) and irradiating parallel light excluding the mask, or irradiating parallel light with the mask applied. after irradiation with, and then irradiating the scattered light with the exception of the mask manufacturing method of the plastic with patterns plate forming a more composed pattern light scattering portion and the transparent portion having a viewing angle dependent. 2. The method for producing a patterned plate according to claim 1, wherein a mask having a transparent portion is used as the patterned mask.