JP2555860B2 - Heat ray shield - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a heat ray shielding plate,
Particularly, the present invention relates to a heat ray shielding plate which has a good transparency, is relatively inexpensive, and is excellent in workability. The heat ray shielding plate is used as a roofing material or a wall material for a tennis court, a pool, an arcade, a dome, a building or As a so-called glazing material such as a window of a vehicle, it can be widely utilized in various forms such as a plate shape, a sheet shape and a film shape.

[0002]

2. Description of the Related Art In recent years, in the field of various buildings and window materials for vehicles, it is possible to shield the heat rays while sufficiently incorporating visible light, that is, to suppress the temperature rise in the room while maintaining the brightness. The demand for such heat ray shielding plates is rapidly increasing, and several kinds of heat ray shielding plates are actually on the market.

A typical one of these is a heat-reflecting film obtained by vapor-depositing metal particles on a transparent resin film, which is adhered to a transparent substrate. This is not only very expensive, Since the adhesiveness between the transparent base material and the reflective film is generally poor, the reflective film may peel off during processing, and it is difficult to heat-process it, making it difficult to apply to curved window materials. ing. Further, since this heat ray shielding plate has a half-mirror shape, problems such as reflection obstruction and lack of transparency depending on the angle are pointed out.

In addition to this, for example, Japanese Patent Laid-Open No. 2-17306
As seen in Japanese Patent Publication No. 0, etc., a heat ray shielding plate prepared by kneading particles having heat ray reflecting ability into a transparent resin has been proposed,
This becomes a semi-transparent plate that diffuses transmitted light, which makes it unsuitable for windows of buildings and vehicles. Further, it has a drawback that it causes the same reflection obstacle as that using the reflection film. Furthermore, Japanese Patent Publication No.
As can be seen in Japanese Patent Laid-Open No. 5 and the like, the use of an infrared absorbing agent composed of an organic dye is considered, and the heat ray shielding plate using this infrared absorbing agent has a transparent feeling and good workability.

However, organic infrared absorbers are generally very expensive, and it is not economical to use a heat ray shielding plate prepared by adding an infrared absorber for building materials. Also, there are many infrared absorbers having a sharp absorption wavelength band that selectively absorbs near infrared rays, but infrared absorbers that exhibit a high heat ray shielding effect by having a wide absorption wavelength band are not well known. The absence of infrared absorbers also contributes to the fact that infrared absorbers are rarely used for heat ray shielding plates. Therefore, when the total light transmittance is controlled by adjusting the addition amount of the infrared absorbing agent in producing the heat ray shielding plate, it is necessary to add a considerably large amount of the infrared absorbing agent.

On the other hand, a conventional transparent resin plate colored for glazing (including a transparent resin plate colored with a dye and a pigment and a heat ray reflective film adhered to a transparent substrate) has a total light transmittance of 10 to 60. %, Many are 2
The mainstream is about 0 to 40%. And out of the total radiant energy of sunlight, visible light (340 to 700n
Since about 60% of energy is included in the range of m), it is possible to reduce the glare of direct sunlight by shielding visible light to some extent and obtain the effect of shielding the energy of direct sunlight to some extent. . However, if you block visible light more than necessary, the brightness will decrease,
A total light transmittance of about 20 to 40% is considered to be most suitable.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and its purpose is to maintain a good transparency and to have excellent heat ray shielding performance and to be relatively inexpensive. It is intended to provide a heat ray shielding plate excellent in workability.

[0008]

The heat ray shielding plate according to the present invention, which has been able to solve the above problems, contains carbon black, whereas the conventional heat ray shielding plate contains an infrared absorbing agent. The above is the main point of the invention, and is thus characterized by optionally containing both an infrared absorbing agent and carbon black. At this time, the content of the infrared absorbent is preferably 0.04 to 1.5 g / m ² , and the content of carbon black is 0.01.
It is preferably about 0.3 g / m ² . It goes without saying that the content and form of these components can be controlled independently of each other. It is desired that the total light transmittance is 10 to 60%, preferably 20 to 40%, as in the conventional case.

The existence form of the infrared absorbent and the carbon black is not particularly limited, and the point is that the infrared absorbent and the carbon black only need to be uniformly dispersed in a plan view. Is
It may be uniformly dispersed or unevenly distributed.

The heat ray shielding plate may be composed of a single layer or a plurality of layers, for example, a transparent plate simultaneously mixed with an infrared absorbing agent and carbon black, and a film containing the infrared absorbing agent and carbon black. Non-limiting examples include those laminated on a transparent plate, those printed or coated with a composition containing an infrared absorber and carbon black, and the like.

A thermoplastic resin is most commonly used as the transparent plate, but is not particularly limited. As an infrared absorber, 150 ppm of the infrared absorber is added to have a thickness of 3 mm.
Wavelength of 7 when the polymethylmethacrylate plate of
The most commonly used one has a minimum light transmittance of 20% or less at 00 to 1400 nm, but is not particularly limited. When an infrared absorber having a narrow wavelength range of absorbed light is used as the infrared absorber, the effects of improving the heat ray shielding performance and reducing the amount of the infrared absorber used are large. As the carbon black, a carbon black graft polymer that has good dispersibility and is effective in maintaining transparency is most commonly used, but is not particularly limited.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION It is desirable that 0.01 to 0.3 g / m ^{2 of} carbon black be contained in a heat ray shielding plate. When the amount of carbon black added exceeds 0.3 g / m ² , the total light transmittance becomes low, and 0.01
If it is less than g / m ² , the amount of the infrared absorber used in combination cannot be reduced so much. The preferable addition amount of carbon black is 0.03 to 0.2 g / m ² ,
A more preferable addition amount is 0.04 to 0.15 g / m ² . Carbon black has an average particle size of 10 to 500 nm
Those having an average particle size of more than 500 nm cause agglomeration of particles or cause poor appearance such as impairing transparency. On the other hand, when the average particle size is smaller than 10 nm, not only is it difficult to manufacture the particles themselves, but also the handling is deteriorated because of the fine powder. The preferred average particle size of carbon black is 10 to 100 nm, and the more preferred average particle size is 10 to 60 nm.

Examples of carbon black include channel black, furnace black, thermal black, acetylene black and the like. However, carbon black is generally liable to agglomerate particles and is difficult to disperse. Therefore, a method of using a dispersant together or dispersing by applying a physical external force during granulation has been adopted. However, when a dispersant is used, there is concern that the physical properties of the dispersant may deteriorate, and when kneading during granulation and dispersion by external force, a long kneading operation or a step for dispersing carbon black Is necessary, and it becomes a lot of trouble. However, when a carbon black graft polymer is used as the carbon black, such a problem is solved, and a molded product in which the carbon black is dispersed well can be prepared.
In particular, when the molding method is cast polymerization of an acrylic resin, the dispersion when mixed with the raw material monomer is good, and the effect of using the carbon black graft polymer is even greater.

The infrared absorbent to be blended in the heat ray shielding plate of the present invention is not particularly limited, but when a polymethylmethacrylate plate having a thickness of 3 mm and an addition amount of 150 ppm is prepared, the minimum wavelength within the range of 700 to 1400 nm. It is preferable that the light transmittance is 20% or less. The minimum light transmittance of more than 20% means that the infrared absorbing performance of the infrared absorbing agent is poor, and the addition amount in the case of producing the heat ray shielding plate is large, so that the infrared ray used in the present invention is used. It may be inappropriate as an absorbent.

Further, the above infrared absorber is contained in an amount of 150 ppm.
The difference between the minimum light transmittance of the contained polymethylmethacrylate plate and the light transmittance at a wavelength of 600 nm is 20% or more,
It is preferably 30% or more. Wavelength 60
The light transmittance at 0 nm is a measure of the visible light transmittance, and the fact that the difference between the minimum light transmittance and the light transmittance at a wavelength of 600 nm becomes large as described above means that the visible light transmittance is large. On the other hand, it means that the infrared ray transmission amount is small and the performance as an infrared absorber is good. On the other hand, when the amount of visible light transmitted is small, the addition of carbon black further reduces the amount of visible light transmitted, which may impair the brightness.

The radiant energy of sunlight is 1800n
It is extremely small when it exceeds m, and about 2/3 of the infrared part of the radiant energy of sunlight is 700 to 1400 nm.
It is included in the range of. Therefore, 700-1400n
Infrared absorbers having the ability to absorb infrared radiation within the range of m will be most suitable for the purposes of the present invention.

The infrared absorber is contained in the heat ray shielding plate in an amount of 0.04 to
It is desired to add it in the range of 1.5 g / m ² . 1.
When it exceeds 5 g / m ² , not only is it extremely expensive as a heat-shielding plate, but it is also used in combination with carbon black.
The brightness may be impaired. On the other hand, if it is less than 0.04 g / m ² , the heat ray shielding effect will be small. It is more preferably 0.1 to 1.0 g / m ² , and even more preferably 0.1 to 0.5 g / m ² .

When a polymethylmethacrylate plate having a thickness of 3 mm and having an addition amount of 150 ppm is prepared, the wavelength of 700 is satisfied.
Examples of the infrared absorber having a minimum light transmittance of 20% or less within a range of 1400 nm to 1400 nm include polymethine dyes, pyrylium dyes, thiopyrylium dyes, squarylium dyes, croconium dyes, azurenium dyes, and phthalocyanines. System dyes, tetradehydrocholine system dyes, dithiol metal complex salt system dyes, naphthoquinone system dyes, anthraquinone system dyes, triphenylmethane system dyes, aminium system dyes, diimmonium system dyes and the like.

Generally, for example, manufactured by Nippon Kayaku Co., Ltd. (IR-750, IRG-002, IPG-003, I
RG-022, IRG-023, IRG-820, CY
-2, CY-4, CY-9, CY-20), manufactured by Mitsui Toatsu Chemicals, Inc. (PA-001, PA-1005, PA-
1006, SIR-114, SIR-128, SIR-
130), manufactured by Fuji Photo Film Co., Ltd. (IRF-7
00, IRF-770, IRF-800, IRF-90
5, IRF-1170) and the like can be used, but it goes without saying that the present invention is not limited to those exemplified above.

Further, not only one type of infrared absorbing agent but also two types
It is also possible to mix and use more than one type,
When two or more kinds having different absorption wavelengths are used in combination, the heat ray shielding effect may be improved.

When the color tone as a glazing material is unsuitable when an infrared absorbent and carbon black are added to a transparent plate, a general dye is added to adjust the color tone to an appropriate color tone. You can also do

A resin typically constitutes the transparent plate of the present invention. The resin used here is not particularly limited as long as it is substantially transparent and does not have large absorption / scattering, and specific examples thereof include polycarbonate resin; acrylic resin such as methyl methacrylate. Polyvinyl resins such as polystyrene, polyvinyl chloride and polyvinylidene chloride; polyolefin resins such as polyethylene and polypropylene; vinyl acetate resins such as polybutyral resin and polyvinyl acetate; polyester resins; polyamide resins and the like. ,
As long as it is substantially transparent, it is not limited to the above-mentioned one type of resin, and 2
A blend of more than one type of resin can also be used. It is also possible to use the above resin sandwiched in transparent glass.

Among these transparent resins, considering practical use, polycarbonate resin, (meth) acrylic resin, polyethylene resin, polyester resin (P
ET resin), polystyrene resin or polyvinyl chloride are preferable, and polycarbonate resin, methacrylic resin or polyvinyl chloride are most preferable.

The polycarbonate resin is produced by reacting a dihydric phenol and a carbonate precursor by a solution method or a melting method. The following are typical examples of the dihydric phenol. For example, 2,2-
Bis (4-hydroxyphenyl) propane [bisphenol A], 1,1-bis (4-hydroxyphenyl) ethane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 2,2-bis (4-hydroxy-3) , 5-Dimethylphenyl) propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2-
Examples thereof include bis (4-hydroxy-3-methylphenyl) propane, bis (4-hydroxyphenyl) sulfide and bis (4-hydroxyphenyl) sulfone. Preferred dihydric phenol is bis (4-hydroxyphenyl)
Alkane-based ones, particularly those containing bisphenol as a main component are preferable.

As the acrylic resin, methyl methacrylate alone or a polymerizable unsaturated monomer mixture containing 50% or more of methyl methacrylate or a copolymer thereof is preferable.
Examples of the polymerizable unsaturated monomer copolymerizable with methyl methacrylate include methyl acrylate, ethyl (meth) acrylate (meaning methyl acrylate or methyl methacrylate, the same applies hereinafter), (meth) acrylic acid Butyl,
Cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, methoxyethyl (meth) acrylate, ethoxyethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, N, N (meth) acrylate -Diethylaminoethyl glycidyl (meth) acrylate, tribromophenyl (meth) acrylate, tetrahydroxyfurfuryl (meth) acrylate, ethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tripropylene glycol Di (meth) acrylate, trimethylolethane di (meth) acrylate, neopentyl glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, etc. It is below.

As the vinyl chloride resin, not only a homopolymer of vinyl chloride alone but also a copolymer containing vinyl chloride as a main component can be used. Monomers that can be copolymerized with vinyl chloride include vinylidene chloride, ethylene,
Examples thereof include propylene, acrylonitrile, vinyl acetate, maleic acid, itaconic acid, acrylic acid and methacrylic acid.

In preparing the heat ray-shielding plate of the present invention, various additives used in the production of ordinary transparent resin materials may be added. Examples of the additive include a colorant, a polymerization regulator, an antioxidant, an ultraviolet absorber, a flame retardant, a plasticizer, a rubber for improving impact resistance, and a release agent.

Examples of the method for molding the heat ray shielding plate containing the carbon black and the infrared absorbent include extrusion molding, injection molding, cast polymerization, press molding, calender molding, and cast film forming method.

As a method other than the above, a film containing carbon black and a near-infrared absorber is prepared, and the film is heat-pressed or heat-laminated on a transparent resin plate to prepare a heat-ray shielding plate. A heat ray shielding plate can also be obtained by printing or coating an acrylic resin ink or paint containing carbon black and an infrared absorber on a transparent resin plate.

There is no particular limitation on the shape of the heat ray shielding plate,
In addition to the most general flat plate shape and film shape, various shapes such as corrugated plate shape, spherical shape and dome shape are included. The concentrations of carbon black and infrared absorber are shown as weight per unit area in a plan view, but irregular shapes such as a corrugated plate may be considered as weight in the projected area from above. Further, as long as there is no problem in appearance, the carbon black and the infrared absorbent may have uneven concentration distribution. Especially in the thickness direction, uniformity is not required.

[0031]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the examples below. In addition, in the following examples, the total light transmittance is measured based on JIS K 7105 using "NDH-300A" manufactured by Nippon Denshoku Co., Ltd., and the solar radiation transmittance is "UV-3100PC" manufactured by Shimadzu Corporation. Use, J
It was measured according to IS K 3106. In the examples, parts and% are parts by weight and% by weight, unless otherwise specified.

Example 1 A carbon black graft polymer "CX-GLF-21" (manufactured by Nippon Shokubai Co., Ltd., carbon content 33.3%, polymer component) was added to 100 parts of methyl methacrylate as a polymerizable raw material in a stainless beaker. 90 ppm of styrene-acrylic type (30 ppm as carbon black with respect to 100 parts of methyl methacrylate), 40 ppm of infrared absorber Kayasorb IRG-022 (manufactured by Nippon Kayaku Co., Ltd.) (methyl methacrylate 10)
Added (to 0 parts), mixed, and thoroughly dispersed.

To this mixture, 0.01 part of dioctylsulfosuccinate sodium salt as a release agent, 0.15 part of 2,2'-azobis-2,4-dimethylvaleronitrile as a polymerization initiator, and an ultraviolet absorber were added. 0.2 parts of benzotriazole was added and mixed. This is poured into a mold set to have a plate thickness of 3 mm in advance, and 60
It was immersed in a water bath at ° C for 5 hours, and then heated in an air bath at 120 ° C for 2 hours to complete the polymerization, and after cooling, a resin plate having a plate thickness of 3 mm was obtained. The amount of carbon black per unit area is 0.108 g / m ² , and the amount of infrared absorber is 0.1.
It becomes 144 g / m ² .

Example 2 Carbon black graft polymer "CX-GLF-21" was added to 100 parts of methyl methacrylate as a polymerizable raw material.
90ppm (30pps for carbon black
m), infrared absorber Kaysorb IRG-002
(Nippon Kayaku Co., Ltd.) was used except that 100 ppm was used.
The same procedure as in Example 1 was performed to obtain a resin plate having a plate thickness of 3 mm.
The amount of carbon black per unit area is 0.108 g /
The amount of m ² and infrared absorber is 0.36 g / m ² .

Example 3 60 parts of a polycarbonate resin (Panlite 1285Z manufactured by Teijin Kasei Co., Ltd.) and 40 parts of channel black having an average particle diameter of 30 mm were heated and mixed by a kneader, and then pulverized. Polycarbonate resin (made by Teijin Chemicals Ltd.
Panlite 1285Z) 3 parts of the above crushed product in 100 parts
7.5ppm (15pp as carbon black
m), adding 70 ppm of infrared absorber sample 1,
After mixing with a blender, extrusion molding using a T-die,
A resin plate having a thickness of 3 mm was obtained. The amount of carbon black per unit area 0.054 g / m ^2, the amount of infrared absorbing agent becomes 0.252 g / m ^2.

<Example 4> 100 parts of methacrylic resin (SUMIPEX B manufactured by Sumitomo Chemical Co., Ltd.), 60 ppm of carbon black graft polymer "CX-GLF-21" (20 ppm as carbon black), and infrared absorbent sample 2 Was added by 65 ppm and mixed by a blender, and then extrusion-molded using a T die to obtain a resin plate having a thickness of 3 mm. The amount of carbon black per unit area is 0.072 g / m
² , the amount of infrared absorber is 0.234 g / m ² .

Example 5 A resin plate having a plate thickness of 3 mm was obtained in the same manner as in Example 3 except that 130 ppm of Sample 3 was used as the infrared absorbent. The amount of carbon black per unit area is 0.054
g / m ^2, the amount of infrared absorbing agent becomes 0.468 g / m ^2.

IRG-022: substance name 2.5-cyclohexadiene-1,4-diylidene-bis [N, N-bis (4-dibutylaminophenyl) ammonium] bis (hexafluoroantimonate) IRG-002: substance Name N, N-bis (4-dibutylaminophenyl) -N- [4- [N, N-bis (4-dibutylaminophenyl) amino] phenyl] -aminium hexafluoroantimonate Sample 1: Substance name 3, 6-octafluoro-
(4,5-Octakisanilino) oxyvanadium phthalocyanine sample 2: substance name 4,5-octakisanilino- (3,6-octakisphenylthio) oxyvanadium phthalocyanine sample 3: substance name 4,5-octa Quisbutylthio- (3,6-octakisphenylthio) oxyvanadium phthalocyanine

Comparative Example 1 100 parts of methyl methacrylate as a polymerizable raw material, 40 ppm of an infrared absorbing agent Kayasorb IRG-022 (manufactured by Nippon Kayaku Co., Ltd.), and a dye Kayaset Blu instead of the carbon black graft polymer.
e A-2R 11ppm, Kayase Red A-
2G 14ppm, KayasetGreen AB
5ppm, Kayaset Yellow A-G 3p
A resin plate having a plate thickness of 3 mm was obtained in the same manner as in Example 1 except that pm (all dyes manufactured by Nippon Kayaku Co., Ltd.) were used. The amount of infrared absorbent per unit area is 0.144g
/ M ² , the total amount of dye is 0.1188 g / m ² .

Comparative Example 2 The amount of the infrared absorbing agent Kayaset IRG-022 was set to 1.
The same procedure as in Comparative Example 1 was repeated except that the amount was changed to 00 ppm,
A resin plate having a plate thickness of 3 mm was obtained. The amount of infrared absorbent per unit area is 0.360 g / m ² , and the total amount of dye is 0.1
It becomes 188 g / m ² .

Comparative Example 3 The amount of carbon black kraft polymer was 300 ppm.
A resin plate having a plate thickness of 3 mm was obtained in the same manner as in Example 1 except that the carbon black was changed to 100 ppm. The amount of carbon black per unit area is 0.36g
/ M ^2, the amount of infrared absorbing agent becomes 0144g / m ^2.
Total light transmittance was measured to be 2.2% (%)
Therefore, it is not suitable as a heat ray shielding plate.

Comparative Example 4 A resin plate having a plate thickness of 3 mm was obtained in the same manner as in Comparative Example 1 except that 100 ppm of Kayaset IRG-002 (manufactured by Nippon Kayaku Co., Ltd.) was used as the infrared absorbent. The amount of infrared absorbing agent per unit area 0.36 g / m ^2, the total amount of the dye becomes 0.1188g / m ^2.

Comparative Example 5 A resin plate having a plate thickness of 3 mm was obtained in the same manner as in Comparative Example 1 except that 220 ppm of Kayaset IRG-002 (manufactured by Nippon Kayaku Co., Ltd.) was used as the infrared absorbent. The amount of infrared absorber per unit area is 0.792 g / m ² , and the total amount of dye is 0.1188 g / m ² .

Comparative Example 6 The amount of carbon black kraft polymer was 300 ppm.
A resin plate having a plate thickness of 3 mm was obtained in the same manner as in Example 2 except that the carbon black was changed to 100 ppm. The amount of carbon black per unit area is 0.36
g / m ² , and the amount of infrared absorber is 0.36 g / m ² . The total light transmittance was measured to be 1.2% (%), which is not suitable for a heat ray shielding plate.

Comparative Example 7 The amount of carbon black kraft polymer was 210 ppm.
(70 ppm as carbon black) and the same procedure as in Example 2 except that the amount of the infrared absorber was changed to 500 ppm to obtain a resin plate having a plate thickness of 3 mm. The amount of carbon black per unit area 0.252 g / m ^2, the amount of infrared absorbing agent becomes 1.8 g / m ^2. The total light transmittance was measured and found to be 3.9% (%), which is not suitable for a heat ray shielding plate.

Comparative Example 8 To 100 parts of a polycarbonate resin (Panlite 1285Z manufactured by Teijin Kasei Co., Ltd.), 130 ppm of the infrared absorbent sample 1 was added and mixed with a blender, and then T
Extrusion molding was performed using a die to obtain a resin plate having a thickness of 3 mm.
The amount of infrared absorber per unit area is 0.468 g / m
It becomes ² .

<Comparative Example 9> Methacrylic resin (SUMIPEX B manufactured by Sumitomo Chemical Co., Ltd.) 10
150 ppm of infrared absorbent sample 2 was added to 0 part, and after mixing with a blender, extrusion molding was performed using a T die to obtain a resin plate having a thickness of 3 mm. The amount of infrared absorbent per unit area is 0.54 g / m ² .

Comparative Example 10 A resin plate having a plate thickness of 3 mm was obtained in the same manner as in Comparative Example 8 except that 350 ppm of Sample 3 was used as the infrared absorbent. The amount of infrared absorber per unit area is 1.26 g / m
It becomes ² .

Comparative Example 11 A methacrylic resin (SUMIPEX B manufactured by Sumitomo Chemical Co., Ltd.) was used as T.
Extrusion molding was performed using a die to obtain a resin plate having a thickness of 3 mm.

<Comparative Example 12> Methacrylic resin (SUMIPEX B manufactured by Sumitomo Chemical Co., Ltd.) 10
Dye Kayase Blue A-2R 60 in 0 part
ppm, Kayaset Red A-2G30pp
m, Kayaset Yellow A-G 23pp
After adding m and mixing with a blender, extrusion molding was performed using a T die to obtain a resin plate having a thickness of 2 mm. The total amount of dye per unit area is 0.2712 g / m ² .

<Comparative Example 13> A dye was used as Kayaset Green AB 23 pp.
m, KayasetBlue A-2R 15ppm, K
ayaset Red A-2G 45ppm, Kaya
A resin plate having a plate thickness of 2 mm was obtained in the same manner as in Comparative Example 11 except that the amount of the set yellow A-G was changed to 8 ppm. The total amount of dye per unit area is 0.2184 g /
It becomes m ² .

Comparative Example 14 A resin plate having a plate thickness of 2 mm was prepared in the same manner as in Comparative Example 11 except that 30 ppm of carbon black kraft polymer "CX-GLF-21" was used instead of the dye (10 ppm as carbon black). Got The amount of carbon black per unit area is 0.036 g / m ² .

The amounts of carbon black, infrared absorbers and dyes of Examples 1 to 4 and Comparative Examples 1 to 13 and the values of total light transmittance and solar radiation transmittance are shown in Table 1. Charts showing the relationship between the transmittance and the wavelength of such materials are shown in FIGS.

An infrared absorbing agent (150 ppm) was added to prepare a polymethylmethacrylate plate having a thickness of 3 mm, and 700
The wavelength showing the minimum light transmittance in the range of ˜1400 nm, the light transmittance at that wavelength, and the light transmittance at 600 nm were measured with a spectrophotometer, and the values are shown in Table 2. (The method for producing the polymethylmethacrylate plate was the same as in Example 1.)

[0055]

[Table 1]

The larger the value of the total light transmittance, the larger the amount of visible light transmitted, which is bright, and the smaller the value of the solar radiation transmittance, the better the heat ray shielding performance.

[0057]

[Table 2]

As is clear from Table 1, the heat ray shielding plate using the carbon black of the present invention and the infrared absorbing agent in combination is compared with the heat ray shielding plate using only the infrared absorbing agent or the infrared ray absorbing agent and the dye. Thus, it can be seen that the amount of the infrared absorber used is about half, and depending on the type of the infrared absorber, the same amount of the infrared absorber has the same heat ray shielding effect. Further, as in Comparative Examples 3, 6 and 7, when the carbon black (A) or the infrared absorber is used in an amount exceeding the range of the present invention, the total light transmittance becomes too low, which is suitable for a heat ray shielding plate. Absent.

From FIGS. 1 and 2, when a dye is added to the infrared absorber, only the transmittance of visible light is lowered, but when carbon black is added, the transmittance is lowered as a whole. ing. It is considered that this is because carbon black has an infrared absorbing property. 3 to 4, the large absorption peak in the range of 1600 nm or more is the absorption peculiar to the substance of the polycarbonate resin or the acrylic resin.

[0060]

The combined use of carbon black and the infrared absorber has the same or greater heat-ray shielding effect as compared with the case where the infrared absorber is used alone or the infrared absorber and the dye are used. The amount of the absorbent added can be reduced. That is, by adding a specific amount of carbon black and an infrared absorber to a transparent resin to form a transparent resin plate, a transparent feeling is good and a heat ray shielding effect is excellent, and further, it is relatively inexpensive and has good workability. It has become possible to provide an excellent heat ray shielding plate.

[Brief description of drawings]

FIG. 1 is a chart showing the relationship between the light transmittance and wavelength of Example 1 and Comparative Examples 1 and 2.

FIG. 2 is a chart showing the relationship between light transmittance and wavelength in Example 2 and Comparative Examples 4-5.

FIG. 3 is a chart showing the relationship between light transmittance and wavelength in Example 3 and Comparative Example 8.

FIG. 4 is a chart showing the relationship between light transmittance and wavelength in Comparative Examples 11-12.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location // C08J 5/00 CEY C08J 5/00 CEY (C08L 101/00 51:10) (72) Invention Koji Yoshitoshi 1-25-25 Kannondai, Tsukuba-shi, Ibaraki Japan Nippon Shokubai Co., Ltd. Tsukuba Research Laboratory (56) Reference JP-A-7-62189 (JP, A)

Claims (7)

(57) [Claims] 1. A heat ray shielding plate comprising an infrared absorber and carbon black. 2. The content of carbon black is 0.01 to.
The heat ray shielding plate according to claim 1, which has a weight of 0.3 g / m ² . 3. The infrared absorber content of 0.04 to 1.
The heat ray shielding plate according to claim 1 or 2, which has a weight of 5 g / m ² . 4. The heat ray shielding plate according to claim 1, which has a total light transmittance of 10 to 60%. 5. The heat ray shielding plate according to claim 1, wherein the heat ray shielding plate uses a thermoplastic resin. 6. The heat ray shielding plate according to claim 1, wherein the carbon black is a carbon black graft polymer. 7. The infrared absorbing agent comprises 15% by weight of the infrared absorbing agent.
The minimum light transmittance at a wavelength of 700 to 1400 nm in a polymethylmethacrylate plate having a thickness of 3 mm prepared by adding 0 ppm is 20% or less.
The heat ray shielding plate according to any one of to 5.