JPS5852628A - Reflective screen - Google Patents

Abstract

PURPOSE:To obtain a reflective screen which is usable even in daylight, has high reflection brightness, and is a wide diffusion type, by forming a metallic reflecting layer on a sheet of a material made of an acrylic multilayered structure polymer. CONSTITUTION:A sheet of a material 1 made of an acrylic multilayered structure polymer has nondirectional fine rugged surfaces as its front surface 11 and back surface 12. Further, a metallic reflective layer 2 is formed by being adhered directly to the back surface 12, and a backing layer 3 is formed of various coating films, a lamination of films and sheets, etc., including epoxy materials to protect the metallic reflecting layer 2. The front and/or back surfaces may be made into directional fine rugged surfaces.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reflective screen of high reflective brightness and wide diffusion type that can be used even in daylight.

Reflective Starry has been used for a long time as a projection surface for movies and slides, but it is also used as a projection surface for an overhead projector in bright places such as offices. Recently, it has also been used as a projection surface for large color televisions and video projectors. By the way, when such a reflective screen is used as a projection surface for a television or video projector, it is generally used in a bright place, so it is required to have high reflective brightness, and also to have high diffusion, that is, to maintain a constant brightness over a wide angle. There is a need to.

One type of reflective screen that has been used conventionally is one that uses aluminum foil as a reflective material. This screen is made by pressing two pieces of aluminum foil together and then peeling them off. At this time, fine irregularities are created on the aluminum surface, which is used as a reflective surface. A coating layer containing silica powder is formed in order to improve coating or diffusibility. However, the reflective screen obtained in this way has irregular fine irregularities and lacks uniformity, and the diffuse reflection is not sufficient, and furthermore, when wiping the surface, stains and smudges appear. It has the disadvantage of being easy to stick to.

In addition, the reflective screen with a hairline surface is also available! It has already been proposed as Publication No. i 3-30490. However, the reflective screen in this case is
J on the lining and the shooting surface! ``The hairline surface of the lining is formed on 7 sides, and a thin coating layer is formed on this surface.

One example is a case where a transparent plastic film is used, but in this case there is a concern that the reflection efficiency will decrease due to interfacial reflection, and there are also concerns about personnel considerations due to long-term use. There were some aspects that were not necessarily sufficient.

The present invention has been made in view of these circumstances, and its gist is to provide a sheet-like product made of an acrylic multilayer structure polymer with a metal reflective layer formed thereon. A non-directional fine uneven surface is formed on the front and back surfaces of the sheet-like object, and a metal reflective layer is directly adhered to the back surface of the sheet-like object, and a lining is provided to protect the metal reflective layer. It is located on a reflective screen characterized by the formation of.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a partially enlarged sectional view showing a first embodiment of the reflective screen of the present invention, and FIG. 2 is a partially enlarged sectional view showing the second embodiment. ) is the front, (+2) is the back, (2) is the metal reflective layer, (3)
is the backing.

The present invention is characterized in that a film or sheet made of an acrylic multilayer structure polymer is used as the sheet-like material (1). Here, the acrylic multilayer structure polymer refers to a multistage polymer containing acrylic acid ester and methacrylic acid ester as main components, and among them, the most suitable polymer for the present invention is the patent application already filed by the applicant. Gansho 56-26
There is a multilayer structure polymer shown in No. 553.

This multilayer structure polymer consists of 80 to 1.00 parts of argyl acrylate having an alkyl group having 1 to 8 carbon atoms or 10 to 20 parts of an alkyl acrylate (AI) having an alkyl group having 1 to 4 carbon atoms. A monomer (A2) having a double bond capable of copolymerization.

0 to 10 parts of polyfunctional monomer (A3).

(for the total amount of 100 copies of (A1) to (A3)), 1 to
The innermost layer polymer (A
).

Alkyl acrylate (Bl) having an alkyl group having 1 to 8 carbon atoms in 80 to IOQ parts.

0 to 20 parts of a monomer having a copolymerizable double bond (B
t).

0 to 10 parts of polyfunctional monomer (B).

0.1 to 5 per 100 parts of total amount of (B,) to (B,)
Cross-linked elastic type (5) consisting of the composition of the graft cross-agent of

51 to 100 parts of alkyl methacrylate having 1 to 4 carbon atoms
) (C+).

0 to 49 parts of a monomer having a copolymerizable double bond (C
2) has a glass transition temperature of at least 60°C
The basic structural unit is the outermost layer polymer (C), which is a bipolymer (
An alkyl acrylate (DI) having 10 to 90 parts of an argyl group having 1 to 8 carbon atoms as an intermediate layer (D) between the layer B) and the polymer (C) layer.

Alkyl acrylate (D,) having 90 to 10 parts of an alkyl group having 1 to 4 carbon atoms.

0 to 20 parts of a monomer having a copolymerizable double bond (D
3).

0 to 10 parts of polyfunctional monomer (D4).

0.1 to 5 per 100 parts of the total amount of (D,) to (D4)
The intermediate layer (D) has a composition of a graft cross-agent of
), and (6) the multilayer structure polymer has a gel content of at least 50%,
The remaining metal-containing seams are 5001) pm or less/l.
These acrylic multilayer polymers have excellent weather resistance, solvent resistance, stress whitening resistance, water whitening resistance, and transparency. It also has diffusion properties that are ideal for use as a reflective and screen base material (-1).

However, the acrylic multilayer structure polymer tar used in the present invention is not limited to the polymers listed in "2" (1).
For example, Japanese Patent Publication No. 47-13371, Japanese Patent Publication No. 49-4
6158 August Bulletin, L'liY Publication 49-461-5!
Publication No. 1, Special Publication No. 52-26901, Special Publication No. 1973
-33277, JP-A-51-129449, Tochi JP-A-52-56150, U.S. Patent No. 3
No. 562235, US Patent @ 40525254
'lr polymers may also be used, as shown in the specification Nail et al. Note that acrylic multilayer 41. ! The emulsion multi-stage polymerization method is most suitable as a manufacturing method for the molded composite, but it is not necessarily limited to this method.

(7) The thickness of the sheet-like material (1) is not particularly limited as long as it is suitable for forming a non-directional finely uneven surface or a directional finely uneven surface, which will be described later. 1y
0.15 to 11117 nm is particularly preferred. A material having such a thickness is generally referred to as a film or a sheet, and the sheet-like material (1) of the present invention includes all of these.

And the front (]I1 and the back (1) of the sheet-like material (1)
2) has a non-directional fine uneven surface. Here, the term non-directional finely uneven surface refers to a finely rough surface called ``m'', an uneven surface that is somewhat rougher than a blank surface called embossed, or a similar finely uneven surface, but none. The base and the emboss may be both formed.These minute uneven surfaces contribute to a matte effect on the front or a light diffusion effect on the front and/or back, and may be used depending on the purpose. All you have to do is select the roughness of the uneven surface.In the case of the first embodiment (8) in Fig. 1, both the blank area and the emboss are formed on the front side (11), and the blank area is formed on the back side (2). In addition, in the case of the second embodiment shown in Fig. 2, which is the opposite of the first embodiment, a blank area is formed on the iF surface (11), and a blank area and an emboss are formed on the back surface (I2). It is preferable to form the blank area and the emboss simultaneously in this way in order to improve the light diffusion performance, but as a guideline for the reflection characteristics in this case, the reflectance at 60 degrees (AsT
It is preferable to process the material so that it has a 60° gloss (according to M-D-523) of 20 or less, particularly preferably 12 or less. In addition, non-directional finely uneven surfaces.

Although it may be applied in post-processing after creating a sheet-like product (II), it is preferable to shape it during the production of a film or sheet.

Further, a directional fine uneven surface can be formed on the front and/or back surfaces of the sheet-like article (1) of the present invention. This directional fine uneven surface includes fine streak-like unevenness called a hairline, fine lenticules, etc. They are used to further increase the horizontal diffusion of the screen, but depending on the purpose, they may be provided horizontally or in both directions.

The metal reflective layer (2) is on the back side (12) of the sheet autumn item (1).
It must be formed so that it adheres directly to the surface. If the back (
] 2) and the metal reflective layer (2), an air layer will be present, causing interfacial reflection and loss. From this perspective,
One effective method is to form the metal reflective layer (2) by metal vapor deposition. Metals such as aluminum with high reflectivity.

The metal reflective layer (2) of the present invention can be obtained by forming the metal reflective layer (2) to a thickness of 500λ or more using a metal vapor deposition method, but a sputtering method may be used instead of the metal vapor deposition method.

An ion blating method or the like may also be used.

The main purpose of the lining (3) is to protect the metal reflective layer (2), and it can be coated with various coatings such as epoxy,
Examples include lamination of films and sheets (10). When it is necessary to add rigidity to the screen,
A separate sheet or frame material can be attached to serve as the lining (3). Further, in cases where flexibility is required, such as a roll-up type screen, cloth or a sheet can be used as the lining (3).

Since the present invention has the above-described structure, in addition to the transparency, weather resistance, and diffusion characteristics unique to the sheet-like material made of the acrylic multilayer structure assembly, the non-directional properties formed on the front and back surfaces are The finely textured surface of the screen, combined with the metal reflective layer, provides a reflective screen with high brightness and wide diffusion.
``I can do something.

Specific examples will be described below, and all parts and ratios of substances used in these examples are parts by weight and weight units.

(1) Production of multilayer structure polymer 250 parts of ion-exchanged water, 2 parts of esterunda salt of sulfosuccinic acid, and 0.05 part of fudium formaldehyde sulfoxylate were placed in a polymerization vessel equipped with a cooler, and after stirring under nitrogen, methyl Methacrylate (MMA) i, a part, butyl acrylate (BuA,) 8 parts, ■, 3 butylene/dimethacrylate (BD) 0.4 part, allyl methacrylate (AMA) 0.1 part, and cumento hydroperoxide (CHP) A mixture consisting of 0.04 parts was charged. After raising the temperature to 70°C, the reaction was continued for 60 minutes to complete polymerization of the innermost layer polymer (A). Subsequently, 1°5 parts of MMA and 22 parts of BuA to form a crosslinked elastic polymer (B)
, 5 parts.

A monomer mixture consisting of 1.0 part of B D and 25 parts of AMAo was added over 60 minutes and polymerized to obtain a two-layer crosslinked rubber elastic body. In this case, the amount of CHPO used to form the polymer (B) was 0.05% based on the weight polymer.

The degree of swelling and gel content of the resulting two-layer crosslinked rubber elastic body were determined by the methods described above and were 10 and 0.90%, respectively.

Subsequently, a mixture of 5 parts of MMA, 5 parts of BuA, and 0.1 part of AMA was reacted as an intermediate layer (D).

Finally, as the outermost layer polymer (C) MMA 52.2
A monomer mixture consisting of 5 parts of Bu A and 2.75 parts of Bu A was similarly polymerized to obtain a multilayered polymer. In addition, C used for polymerization of the intermediate layer (D) and the outermost layer (C)
ff I) is 0.0% of the amount of monomer used in each layer. It is lchi. The final particle size of the multilayered polymer is O91~
It was 0.15μ.

These damaged polymer emulsions were combined into 7di 100
The mixture was salted out using 5 parts of calcium chloride per 1 part, thoroughly washed, dehydrated, and dried to obtain -C dry powder.

Next, this dry powder was extruded at 230° C. using an extruder having a screw having a diameter of 40 tnR, and cut into pellets.

(2) Manufacture of transparent sheet After thoroughly drying the obtained pellet, a T-die was installed in an extruder with a 40 mm diameter screw, and the surface of the roll was formed near the die. A rubber roll and a metal (13) with embossed and textured one surface of the roll (13) are placed opposite each other, the extruder temperature is 220-230°C, the die temperature is 240°C, the metal roll temperature (cooling water outlet temperature) is 40°C.
It was extruded at 0° to obtain a transparent sheet with a thickness of 0.25 ynx. The characteristic values of the obtained sheet were as follows.

Total light transmittance (ASTM-D-1003) 92.0
Haze value (ASTM-D-10(13) 4.5
%60 degree reflectance (ASTM-D-523) Metal roll surface 7.2 Rubber roll surface 7.8 Tensile strength at break (ASTM-D-882) 230
kg/cm2 tensile modulus (ASTM-D-882)
9200 ky/cIfL2 tensile elongation at break (AST'M
-11-882) 24 inches (3) Production of reflective screen The rubber roll surface side of the sheet obtained in (2) above is hairline-processed by a normal method, and this surface is coated with a vacuum degree of 10 to
Vacuum deposition of aluminum was performed at 1 OTorr. Separately, the rubber roll surface I of the sheet omitting this hairline processing
I was subjected to vacuum evaporation of aluminum in a similar manner. Evo (14) was formed on the vacuum-deposited surface of each sheet.

All of the reflective screens of the present invention obtained as described above have almost no surface reflection (they exhibit a grayish-white, subdued appearance, and do not show any dirt or scratches even if the surface is rubbed with a piece of cloth or sponge). This was a good result with no occurrence.

Further, as shown in Table 1, it was confirmed that the reflective screen of the present invention has a uniform β value in the horizontal and vertical directions, and is point-diffuse.

Table 1 * Conventional aluminum products are used for large TVs. A screen used as a projection surface Collected from Lean.

Note that the method for measuring the first light brightness is as follows.

A Minolta 1 Luminance Meter was used as a measuring instrument, and a Nikon projector Vyr-8 was used as a light source. The distance between the sample and the light source was set to 1,000mm, and the distance between the sample and the measuring instrument was set to 1.300mm, and the "luminance meter" was set to 5.
The brightness is measured by rotating it in degrees, and the gain (G
− luminance/illumination) and calculated the β value (β

[Brief explanation of the drawing]

FIG. 1 is a partially enlarged sectional view showing a first embodiment of the reflective screen of the present invention, and FIG. 2 is a partially enlarged sectional view showing a second embodiment. (1)...Sheet-like material, (11)...
front. (12)...Back surface, (2)...Metal reflective surface. (3 honorable (... lining (I7) No.) / [21 /l

Claims (1)

[Claims] l. A metal reflective layer is formed on a sheet-like material made of an acrylic multilayer structure polymer, and the front and back surfaces of the sheet-like material have non-directional fine irregularities. 1. A reflective screen/screen, characterized in that a metal reflective layer is directly adhered to the back surface of the sheet-like article, and a lining is formed to protect the metal reflective layer. 2. The reflective screen according to claim 1, wherein a directional fine uneven surface is formed on the front and/or back surface of the sheet-like object.