JPS61118236A - Molding method of non-glare sheet - Google Patents

Abstract

PURPOSE:To enable economic molding of a non-glare sheet having fine unevenness on the surface of the same, by a method wherein a synthetic resin sheet obtained by compounding a constant quantity of dust-size particles having an average particle diameter falling within a specific range is laminated, compressed by heating the same at a specific temperature and peeled off after cooling. CONSTITUTION:A smooth surfacelike non-crystalline transparent synthetic resin sheet 2 plasticized through heating and extruded from an extruding machine 1 contains 20-60wt% dust-size particles whose average particle diameter is 0.1mum-10mum. Both sides of the sheet 2 are put between sheets 3 molded beforehand and made into a three-tiered layer, which is cooled while it is being compressed by a roll 11. A fine uneven surface of the synthetic resin sheet 3 containing dust-size particle solids is transferred to the surface of the non- crystalline transparent synthetic resin sheet through compression by the roll 11. After the sheet has been cooled and cured, the resin sheet 3 containing the dust-size particles is rolled up by peeling the three-tiered layer and a non- glare sheet 4 is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for molding a non-glare sheet made of amorphous transparent synthetic resin used for visual display terminals and the like.

(Prior art) A so-called non-glare sheet is a transparent synthetic resin sheet with minute irregularities on the surface to scatter reflected light.
Recently, it has become widely used as covers for various visual display terminals5. Conventionally, this non-glare sheet has been produced using the so-called sandblasting method, which involves blowing finely powdered solid onto the surface of a transparent synthetic resin sheet to create unevenness on the surface of the sheet. It is formed by a cell-cast polymerization method of acrylic resin using a glass plate having the same structure as a cell, or by a method of applying a transparent paint to the surface of a transparent synthetic resin sheet to form irregularities on the surface.

(Problems to be Solved by the Invention) Each of the above-mentioned conventional square beds has drawbacks, such as problems in quality or bottom shape cost.

For example, in the cell-cast polymerization method of acrylic resin, the polymerized acrylic resin sheet cannot be easily bonded to glass that has a finely uneven surface, and the glass may break or a part of the resin sheet surface may be exposed to the uneven surface of the glass. There are problems such as it getting stuck and being removed.

(Means for Solving the Problems) As a result of various studies on manufacturing methods for non-glare sheets under the above-mentioned circumstances, the present inventors have found that a non-crystalline transparent synthetic resin sheet has fine particles having an average particle size within a specific range. A non-glare sheet free of the above problems can be obtained by compressing a laminated sheet in which synthetic resin sheets containing a certain amount of powder are laminated and heated to a particularly warm temperature, and then peeling off the laminated sheet after cooling. He discovered this and completed the original 811. .

That is, in the present invention, a synthetic resin sheet containing fine powder v20 to 60 weight tS with an average particle size of 0.1 to 10 μm is laminated to an amorphous transparent synthetic resin sheet, and the glass transition of the amorphous transparent synthetic resin sheet is Non-Mn transparent at temperatures above -&f
y, the viscosity of the resin sheet is smaller than the viscosity of the fine powder-containing synthetic resin sheet (8), which is heated to a state of 111. The pigeon sheet is compressed from the cost per sheet, and after cooling, the vaginal laminated sheet is peeled off. It's a slippery sheet.

In particular, the present invention aims to improve the uneven surface of a synthetic resin sheet containing a certain amount of fine powder with an average particle size within a specific range.
It is characterized by being able to transfer onto the second side of the lf oil sheet within a viscosity range that can be applied to the sheet.

The amorphous transparent synthetic resin sheet used in the present invention is transparent,
Alternatively, it is a transparent non-crystalline synthetic resin, preferably a sheet of acrylic resin, which is generally referred to as a hard transparent resin, polycarbonate with fat, polystyrene, styrene, acrylonitrile copolymer, hard vinyl chloride, or the like. The acrylic resin is a polymer containing methyl methacrylate (hereinafter abbreviated as nirum) as a product component, and MU electropolymer (
(hereinafter abbreviated as PMMA), MMA-containing conjugate, P
MMA or MMA #c, I [polymer blends containing other polymers are available.

Nagi and furkyl acrylate copolymer (hereinafter abbreviated as Co (MMA-jinmu)) can be favorably used for the MMA co-topolymer. Methyl acrylate as alkyl acrylate,
1 to ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, etc.
A 10 it% copolymer can be used satisfactorily. Heat-resistant acrylic resins such as Shikamu anhydrous maleic-styrene ternary copolymer and MMA-methylmethacrylamide copolymer can also be used satisfactorily. Alternatively, a copolymer of MMA and styrene, a styrene derivative, acrylonitrile, methacrylonitrile, acrylic acid, or memethacrylic acid or a copolymer of 2'M1 or more can be used. The polycarbonate resin is an aromatic polycarbonate containing bisphenol A.

Polystyrene, styrene-7crylonitrile copolymer,
Hard vinyl chloride is generally widely used (each grade used can be used as is.
i can be blended. Dyes and pigments, ultraviolet absorbers, heat ray absorbers, thermal reflectors, heat stabilizers, IJA fuel, glass fibers, etc. can be blended. This is 4! It is preferable that the transparency or translucency of the sheet is increased (not reduced) by the additive, and it is preferable to use the additive and each resin by selecting them as appropriate.

Further, the thickness of the amorphous transparent resin sheet may be different depending on the purpose of use of the sheet, but preferably 0.05 to 20 mm, more preferably 0.1 yn to 20 mm.
10 parts can be used.

Fine powder used in the present invention? For the compounded synthetic resin sheet, a resin having a higher softening temperature than an amorphous transparent synthetic resin is used, and crystalline resins are generally preferred. Particularly preferred are sheets of polyamide.

Fine Powder 7: The compounded synthetic resin sheet needs to be non-contactable with the amorphous transparent f-singing resin sheet that is laminated when it is heated and compressed. For example, when acrylic resin is used as the amorphous transparent synthetic resin sheet, if one or two sheets of polyolefin or polyamide are used together with a synthetic side fat sheet that does not contain fine powder, they will not be in contact with each other. Can be used in good condition. The thickness of the resin sheet mixed with powder bed is 0.01 ~ 5
It is best to use koji of 0.02 to 100 g.
I IIK thickness. Since a grease sheet not containing fine powder peels off after compression molding, it needs to be thick enough to withstand peel strength, and it is uneconomical to make it too thick. The "sheet" mentioned in the present invention includes a sheet of 0-Ll 1 m rhinoceros, and means "sheet and film".

The fine powders used in the fine powder blended resin sheet are six types of fine powder solids with an average particle size of 0.1 μm to 10' μm: Merck, calcium carbonate, barium sulfate, calcium sulfate, wollastonite, feldspar, mica, Fine powders such as kaolin and clay can be used. Depending on the particle size and amount of fine powder solid,
Molded 4. The non-glare properties of the non-crystalline transparent resin sheets are different, and the non-glare properties are different. In order to create a surface roughness exhibiting preferable non-glare properties, the average particle size of the fine powder is 0.1 to 10 μm. The amount of fine powder added to hJt fat is in the range of 201% to 60!1% by weight.If the particle size of the powder solid is too small, the molded product will become nearly transparent and the non-glare properties will not be maintained. If the particle size of the powder solid is small enough, it becomes non-glare but opaque.

Average particle size 0.1 μm ~ 10 IML, addition t20 ~ 6
0iL powder is suitable for forming sheets that exhibit non-glare properties and can maintain a certain degree of consistency, and is preferably fine powder with an average particle size of 0.3 to 5 μm and an added weight of 25
If the amount of fine powder added is less than 20*j11%, a preferable finely uneven optical surface cannot be obtained, and if it is more than 60 iji%, it becomes difficult to knead into the resin.

In the present invention, a synthetic resin sheet containing fine powder is laminated with a transparent sheet of amorphous synthetic resin, and the viscosity of the amorphous transparent synthetic resin is higher than the glass transition temperature of the amorphous transparent synthetic resin, and the viscosity of the amorphous transparent synthetic resin is higher than that of the synthetic resin containing fine powder. The laminated sheet is compressed from the narrow side of the sheet at a viscosity lower than that of the resin, and then both sheets are peeled off.

Methods for bringing the two sheets into contact and compressing include compressing with heated rolls, compressing with a press, and the like. The temperature at the time of compression is selected excessively within the range of the above viscosity relationship, but the viscosity must be high enough to transform it into a smooth non-#d'&gold* sheet surface or a non-glare surface. Molding can be performed at a high viscosity within this range on a platform with a large clamping force. The preferred pressure force is 10 to 500 AcjF/a per sheet.
m'', more preferably 60 to 600 m/d, and this pressure is properly selected depending on the viscosity of the resin, pressure #ii time, etc.

A particularly preferred molding method of the present invention is a method in which the sheet surface is made non-glare and the sheet is stretched at the same time by compression molding. A laminate of an amorphous synthetic resin sheet and a finely powdered resin sheet is placed in a compression mold whose inner surface is coated with lubricant at a temperature above the glass transition temperature and below the melting point temperature of the laminate fat sheet. The molded product is compressed and allowed to plug flow in the mold to achieve C2 axis orientation, and after cooling, the molded product is taken out of the mold and each layer is peeled off to obtain a 211IB oriented non-glare sheet.

The amorphous synthetic resin sheet may be a sheet of two or more mutually adhesive layers, if necessary. A non-glare sheet made of transparent 8A resin having a low refractive index and having a thickness that is one-tenth of the original wavelength is more preferable because it has a waviness that reduces the original reflection. As a transparent resin with a small refractive index, various fluororesins are suitable for use.

The present invention will be explained below with reference to the drawings.

FIG. 1 shows a flow sheet for Mr. M who implements the present invention.

In FIG. 1, a smooth-surfaced non-crystalline transparent synthetic resin sheet 2 heated and extruded from an extruder 1 is made of fine powder ya-20 weight tons with an average particle size of 0.1 μm to 10 μm. The three-layer sheet is sandwiched between two pre-formed sheets 3 made of synthetic resin containing 60% by weight of water, and is cooled while being compressed by rolls 11. By this compression by the roll 11, the finely uneven surface of the fine powder solid-containing synthetic resin sheet 3 is transferred to the amorphous transparent synthetic resin sheet Ibarashi. The sheet is cold assimilated, the 6-layer sheet is peeled off, and the finely powdered resin sheet 3Y is rolled up to obtain the non-glare sheet 4. Fig. 8g1 shows a lifting platform that makes both surfaces of the amorphous resin sheet 2 non-glare, but when the powder is enriched, a sheet with a single glare on one side can be obtained.

FIG. 2 shows 70 sheets of another embodiment of the present invention.

In Fig. 2, a different smooth amorphous synthetic resin transparent sheet 2 and a synthetic resin sheet 3 containing fine powder are laminated to form three layers, and a heated pressure kd lid mold 12 is used to form an amorphous transparent sheet. The temperature is higher than the glass transition temperature of the synthetic resin, and the viscosity of the transparent synthetic resin sheet is '4R than the viscosity of the powdered wood-containing fat sheet /J's
Heat it to a temperature that increases rapidly and compress it (Fig. 2).
After cooling in the air, the fine powder-containing synthetic resin sheet 3 is peeled off to obtain a double-sided non-glare sheet 4 of amorphous synthetic resin (
Figure 2B).

Figure 6 shows 70 sheets of other moods in the history of non-invention.

In FIG. 3, after applying a column stirring agent to the inner surface 13 of the pressure mold 12, it is applied to each interface and surface of the four narrow-sided smooth non-crystalline transparent synthetic resin sheets 2. A synthetic resin sheet 3'i-containing fine powder that is not in contact with the sheet is placed and placed in a compression mold 12 (
(Figure 3). The laminate is heated so that the glass transition temperature of the amorphous transparent resin sheet 2 is higher than the melting point, and the viscosity of the amorphous transparent synthetic resin sheet 2 is lower than the viscosity of the powder bed resin sheet 3. After heating to a sensitivity of 2, the laminate 7a is pressed and formed into a biaxially oriented sheet 5'1 (Fig. 3B). - Remove from the compression mold 12 (FIG. 3C) and then peel off each sheet to obtain four sheets 5 with biaxially oriented non-glare surfaces (FIG. 3D).

FIG. 4 shows 70 sheets of yet another embodiment of the present invention.

In FIG. 4, an amorphous transparent resin sheet 2, a laminate sheet 9 of Jilc resinous resin 8 laminated on a resin sheet 7 having layering properties with the amorphous transparent resin sheet 2, and both 304 synthetic resin sheets containing fine powder on the surface (
Figure 4) Y! A laminated sheet is made by kneading it together and stretching it into two thin layers.
In the same manner as shown in FIG. 6, the lubricant 13 is applied to the inner surface of the compression mold 12 and heated. Mold 12 after cooling
When the biaxially stretched fine powder warehouse fat sheet 6 is peeled off, a biaxially stretched laminate sheet 10 having a non-glare surface am'v is obtained.

(Effects of the Invention) Conventionally, it has been difficult to economically form a non-glare sheet having minute irregularities on the sheet ff surface, but it has become possible to form it satisfactorily with the present invention.

The nuclear non-glare sheet can be well used as covers for visual display terminals such as cathode ray tubes, nameplates for office equipment, home appliances, etc., covers for various instruments, etc.

Example A non-glare sheet was molded by the method shown in FIG. The following Tanishin fat sheet was used.

Approximately 0.0% fine powder rich synthetic resin having the composition shown in Table 1.
A 3-thick sheet was used.

(Margin below) Part 1: Different PP: Polypropylene pomobolimer HD-Pg: High density polyethylene LD-PE: Low density polyethylene As the non-crystalline synthetic resin, Tanijun I fat from the second group was used.

W, 2 Table The relationship between temperature and viscosity of each resin used is shown in Figures 5 to 7. Viscosity is D of Rheometrics engineering nc, a.
dynamic Spectrometer RDS-
Using 7700't', shear rate ω=1 radian/
It was measured at 021027777 seconds.

After applying lubricant to the inner surface 13 of the compression mold 12, lubricant 5 is applied to each interface and @back surface of the four amorphous synthetic resin sheet original plates.
Laminate sheets of finely powdered fat sheets and remove the carcass from
．． After vacuum packaging with a 1 mm thick PP sheet, it was compressed and biaxially oriented at the following temperatures.

PMMA 150℃ Co(MMA-AA) 130℃MMA-MM
Ami4 180'CMMA-BT-MAR1
After cooling and solidifying in a 80-C pressure mold, the molded product was taken out and each layer was peeled off to obtain four biaxially oriented sheets with an amorphous stand formation force d. The results are shown in Table 6. Good non-glare sheets were obtained only within the condition range of the present invention.

(Margin below)

[Brief explanation of the drawing]

FIG. 1 shows 70 sheets of one embodiment of the invention, FIG. 2 shows 70 sheets of another embodiment of the invention, and FIG. 6 shows 70 sheets of yet another embodiment of the invention. Figure 4 shows non-A
It is a flow sheet of still another embodiment of light, and brown 5 to
FIG. 7 is a graph showing the relationship between temperature and viscosity of each resin used in Examples. In the figure: 1 is an extruder, 12 is an amorphous transparent table W, a resin sheet, 3 is a synthetic resin sheet containing fine powder, 4 is a non-glare sheet 1.5 is a 2-fine oriented non-glare sheet, 6 is a biaxially arranged Imitation Song Dynasty wealth sheet or toilet fat sheet, 7
8 is a sheet of different resin that is in contact with sheet 7, and 9 is a sheet in which resin sheet 7 is laminated with a different resin sheet 8. , 10 is a biaxially stretched laminate sheet, 11 is a roll, 12 is a compression mold, 13 is a compression mold 1
The inner surface of 2 is shown. Patent Applicant: Asahi Kasei Koka Kaisha Ltd. Figure 1 Figure 2 (A) (B) Figure 3 Figure 5 (uu z Irad, / sec,) +30 14
0 150 160 170 180 Ton-an ('
C) Figure 6 130 140 150 160 170
Old 0 Figure 7 (uu * I rod, / wealth,) +50 160 170 180 190
200 210 Temperature (0C) Procedural amendment (voluntary) February-3, 1985 Michibe Uga, Commissioner of the Patent Office 1, Indication of the case 1982 Patent Application No. 238544 2, Name of the invention Molding of non-glare sheet Law 3, Relationship with the case of the person making the amendment Patent applicant 1-2-6-4 Dojimahama, Kita-ku, Osaka-shi, Osaka Prefecture Contents of the amendment in the "Detailed Description of the Invention" column of the specification to be amended (1) , the following sentence is added next to "Can be used." on page 5, line 5 of the specification. “As a blend of acrylic resin, Co (MMA-
Blends of AA) and polyvinylidene fluoride can be used satisfactorily. (2), page 7, line 5, ``Fine powder such as clay can be used.'' is corrected to ``Fine powder of clay, glass beads, glass balloons, shirasu balloons, etc. can be used.''that's all

Claims (1)

[Claims] Amorphous transparent synthetic resin sheet with average particle size of 0.1 to 10μ
Synthetic resin sheets containing 20 to 60% by weight of fine powder of m are laminated, and the viscosity of the amorphous transparent synthetic resin sheet is equal to or higher than the glass transition temperature of the amorphous transparent synthetic resin sheet. A method for forming a non-glare sheet, characterized by compressing a laminated sheet heated to a smaller size from the sheet surface, and peeling off the laminated sheet after cooling.