JPH0222152A - Interlayer for laminated glass screening light ray of short wavelength - Google Patents

Abstract

PURPOSE:To obtain the title interlayer capable of selectively screening light rays of short wavelength such as ultraviolet light comprising a plasticized polyvinyl butyral resin containing a light absorber consisting of a benzotriazole derivative and finely particulate inorganic substance having a specific range of particle diameter. CONSTITUTION:The interlayer comprises a plasticized polyvinyl butyral resin containing one or more light absorbers consisting of benzotriazole derivatives shown by formula I and formula II and finely particulate inorganic substance having a particle size distribution of >=90wt.% particles with 250-400nm particle diameter. A compound shown by formula Ia may be cited as the compound shown by formula I and a compound shown by formula IIa as the compound shown by formula II. Fine particles such as Al, Al2O3 or SiO2 may be cited as the finely particulate inorganic substance. The interlayer does not require specific blending and specific surface processing technology like specific blended glass or specific surface processed glass and is inexpensively and readily freely processed. The interlayer can selectively absorb and screen light rays having <=400nm short wavelength.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a plastic film laminated between glass plates, and more particularly to a plastic film that can selectively block short wavelength light such as ultraviolet rays. The present invention relates to an interlayer film for laminated glass that blocks wavelength rays.

[Prior art] Short-wavelength light-blocking glass, which selectively blocks short-wavelength light such as ultraviolet rays and transmits visible light and infrared rays, is known to cause UV rays to degrade various substances and have an adverse effect on living organisms. It is used for show windows, showcases, hospital windows, covers for electronic devices such as LCD displays, car windows, etc., and recently, it is also used as a window material for spacecrafts that receive extreme sunlight. has been done.

Examples of glasses that selectively block short-wavelength light such as ultraviolet rays include special blended glass and special surface annealed glass in which the glass itself is endowed with short-wavelength light-blocking performance. However, these glasses require special formulations and surface processing techniques, which increases manufacturing costs and also imposes many restrictions on construction.

In response, an interlayer film for laminated glass that has UV blocking properties has been proposed (such as U.S. Patent No. 3,823,113), and laminated glass using such an interlayer film has the above-mentioned special properties. Although it can be manufactured more cheaply than glass and can be installed more easily and freely, it does not sufficiently block short wavelength light of 400 nm or less.

[Problems to be Solved by the Invention] In the conventional short wavelength light blocking interlayer film shown in the above-mentioned US Pat. No. 3,823,113, as a light absorbing agent,
If less than 0.5 parts by weight of 2-(2'hydroxy-3'-alkyl-5'-alkylphenyl)benzotriazole is used, this interlayer film is only expected to be effective in suppressing discoloration of interior interiors. Can not. In order to further improve the short-wavelength light blocking performance of this interlayer film, increasing the amount of the light absorber exceeds the compatibility limit between the light absorber and the base resin, causing the light absorber to leach onto the surface of the film. The adhesion of the interlayer film to the glass is impaired.

This invention was made based on the above-mentioned background, and its purpose is to solve the problems of the conventional interlayer film that blocks short wavelength rays, so that the adhesion of the interlayer film to glass is not impaired, and An object of the present invention is to provide an interlayer film for laminated glass having short wavelength light blocking properties that has sufficient short wavelength light blocking performance.

[Means for Solving the Problems] As a result of conducting various tests and studies to solve the above-mentioned problems, the present inventors selected a specific benzotriazole derivative as a light absorbing agent, and produced inorganic fine particles with a specific particle size. is used as a short wavelength light scattering agent, and an interlayer film made of a composition in which these are added and blended to ['+J plasticized polyvinyl bityral resin,
The present invention was found to be effective in achieving the object of the invention, and the present invention was completed.

That is, the short wavelength light blocking interlayer film for laminated glass of the present invention basically contains the following components (a), (b) and (c).
).

(a) Plasticized polyvinyl butyral resin (b)
At least one light absorber selected from the group consisting of benzotriazole derivatives represented by the following general formula (1) and benzotriazole derivatives represented by the following general formula (■), preferably 0, 5 to 5 beads % [formula (I) and Indicates an alkyl group of number 1 to 4, n
is an integer from 1 to 1o] (c) At least 90% by weight is 250 to 400nn
The laminated glass according to the present invention substantially blocks light with a wavelength of 400 nm or less and has a particle size distribution of 450 ns or more, preferably 3 to 15% by weight. is substantially transparent.

Here, "substantially blocking light with a wavelength of r400nI11 or less" means not only completely blocking 100% of light of this wavelength, but also allowing transmission of up to 2%, preferably 196 or less. It means that.

Furthermore, "substantially transmitting light with a wavelength of 450 nm or more" includes not only transmitting 100% of light of this wavelength, but also transmitting at least 70% or more, preferably 80% or more. means.

This invention will be explained in more detail below.

Plasticized polybutyral resin The plasticized polyvinyl butyral resin (a) used in this invention is based on polyvinyl butyral 10 as the base resin.
riI plasticizer is contained in an amount of 20 to 50 parts by weight relative to 0 parts by weight.

Plasticizers added to the base resin include phthalate esters such as diethyl phthalate, butyl phthalyl butyl glycolate, butyl benzyl phthalate, diethyl phthalate, dibutyl phthalate, diethyl phthalate, and diisodecyl phthalate, and phosphorus such as tricresyl phosphate. Acid esters, aliphatic dibasic acid esters such as dioctyl adipate, dioctyl adipate, and dioctyl sebacate, polyether esters such as triethylene glycol di(2-ethyl butyrate), tetraethylene glycol dihexanol, and epoxidized soybean oil. , epoxy systems such as epoxy alkyl stearate, or mixtures thereof.

This plasticized polyvinyl butyral resin includes, in addition to the above-mentioned plasticizers, those to which various resin additives are added and blended depending on the purpose. Examples include lubricants, heat stabilizers, antistatic agents, antioxidants, colorants, and fillers.

Light Absorber The light absorber (b) used in this invention is a benzotriazole derivative represented by the above-mentioned general formula (I) and a benzotriazole derivative represented by the above-mentioned general formula (II).

In this formula (1) and (formerly, X and Examples of the amino group include monoalkylamino groups and dialkylamino groups having 1 to 6 carbon atoms, preferably 1 to 4 carbon atoms.

Similarly, R, R and R3 are the same or different and have 1 to 6 carbon atoms, preferably 1 to 4 carbon atoms, such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl,
It represents an alkyl group such as 5ec-butyl and tert-butyl, and n is an integer of 1 to 10.

Specific structural formulas of examples of light absorbers used in the present invention are shown below.

The examples shown above are illustrative of the light absorbent used in the present invention, and there are various other examples in addition to these.

The addition ratio of the light absorber to the interlayer film composition is 0.
．． There are 4 to 6 double weights, preferably 0.5 to 5 double weights.

If it is less than 0.5% by weight, the maximum cutoff wavelength shifts to the short wavelength side, if it is less than 0.4% by weight, this tendency becomes remarkable, and if it exceeds 5% by weight, the adhesion of the interlayer film decreases. This is because when the weight exceeds 96, this tendency becomes remarkable.

Particulate Inorganic Substance The particulate inorganic substance used in this invention has a particle size distribution in which at least 90% by weight is in the particle size range of 250 to 400 nm, and is capable of scattering short wavelength light. There are only 111 types).

Specific inorganic substances include aluminum, gold, silver, copper, zinc, cadmium, mercury, strontium, yttrium, carbon, silicon, titanium, zirconium, germanium, tin, lead, vanadium, niobium, chromium, molybdenum, tungsten, Elements such as sulfur, selenium, chiryl, manganese, iron, cobalt, nickel, palladium, and platinum, and oxides such as alumina (aluminum oxide), silicon oxide, titanium oxide, zinc oxide, magnesium oxide, zirconium oxide, and iron oxide. be.

The inorganic substance according to the present invention has the above-mentioned 250 to 400 nn
It has a particle size distribution in the + particle size range. In this invention,
"Particle size distribution in which at least 90% by weight is in the particle size range of 250 to 400 nm" is defined by laser light scattering particle size measurement method, and is defined by a laser light scattering particle size measurement method, and is defined by a laser light scattering particle size measurement method.
It means a particle size distribution in which the weight percent falls within the particle size range of 250 to 400 na+.

In this invention, the content of the particulate inorganic substance is 2 to 17% by weight, preferably 3 to 15% by weight, based on the interlayer film composition.
Weight%. This means that if it is less than 3% by weight, the maximum cutoff wavelength will be lower than 400r+n+, if it is less than 2% by weight, this tendency will be remarkable, if it exceeds 15 times the transparency of the laminated glass will be impaired, and if it exceeds 17 times This is because this tendency will become more pronounced.

Interlayer Film The interlayer film for laminated glass that blocks short-wavelength light according to the present invention basically comprises a light absorbing agent (b) of a benzotriazole derivative according to the present invention and a particulate inorganic substance (c) as a light scattering agent, as described above. ) and plasticized polyvinyl butyral resin (a)
It consists of

The interlayer film of the present invention can be manufactured by preparing a film-forming raw material resin in which a predetermined amount of components (b) and (c) are blended with the above-mentioned (a) component, and forming a film using this. can.

In the production of raw material resin for film forming, a light absorbing agent (b) and a light scattering agent (c) are usually added to plasticized polyvinyl butyral resin (a).
) can be carried out by adding and mixing polyvinyl butyral, a light absorber and a light scattering agent, and then a plasticizer can be added and mixed. This can be done by adding and mixing the agent and the plasticizer at the same time. Other additives may be added before, during, or after any of the above steps.

Mixing and kneading of the resin and additives is carried out using an ordinary mixer kneader.
It can be implemented using Examples of such mixers include Banbury mixers and Brabender mixers.

Molding of the raw material resin for film formation into an intermediate film is carried out by a conventional method, for example,
Film forming methods such as die extrusion method and calender roll method can be applied. Usually, the obtained film is wound up into a roll and stored, and when manufacturing laminated glass, it is cut into predetermined dimensions and used as an interlayer film.

The thickness of the intermediate film is generally about 200 to 1000 μm, but it can be changed as necessary. It is desirable that the thickness is uniform throughout the interlayer film.
The surface of the interlayer film can be provided with uniformly uneven grains.

[Function] In the present invention having the above configuration, the benzotriazole derivative blended at a higher concentration selectively and strongly absorbs the short wavelength portion of 400 nm or less of the light beam transmitted through the resin.

Historically, since the light scattering agent added to polyvinyl butyral resin has a particle size of 400nI11 or less,
It scatters the ultraviolet portion of 11 or less to promote selective absorption of the benzotriazole derivative, while transmitting light with a wavelength of 450 nm or more.

That is, it substantially blocks light with a wavelength of 400 nm or less, and substantially passes light with a wavelength of 450 nm or more.

The specific benzotriazole derivative according to the present invention has better compatibility with polyvinyl butyral resin than other light absorbers, so it can be used in plasticized polyvinyl butyral resin without impairing the adhesion of the interlayer to glass. However, it can be blended at a high concentration.

[Examples] The present invention will be specifically explained below based on Examples and Comparative Examples, but the present invention is not limited to the following Examples unless the gist thereof is exceeded.

Example 1 Preparation of interlayer film A benzotriazole derivative according to the present invention 1 a [2-(2'-hydroxy-3 -ter
t-butyl-5'-methylphenyl)-5-chlorobenzotriazole] and the light scattering agent aluminum powder (
A predetermined amount of Particles having a particle size of 300 to 400 nn+ was added and mixed at 60° C. for 20 minutes using a Banbury mixer. In addition, Ia
The symbol corresponds to the exemplary structural formula of the light absorbent. The concentration of the light absorber in the resulting mixture was 0.6% by weight, and the concentration of the light scattering agent was 5.5% by weight. It was 0% by weight.

The mixture was formed into a film with a thickness of 0.8+ nm using a die extruder at 150 to 230°C, and the film was stored in a roll.

The particle size of the light scattering agent (aluminum powder) used in this example is determined by dispersing 5.0 weight 96 of the scattering agent in dihexyl adipate, and measuring this dispersion using a laser light scattering particle size measuring device ( Measurement was performed using Microtrac SPA (manufactured by Nikkiso Co., Ltd.). As a result, as mentioned above, 30
It had a particle size range of 0-400 nm.

Laminated Glass Preparation To evaluate the laminated glass, a 15x15 cm interlayer film was mixed with 0.3-0.45% by weight in an atmosphere of 25% relative humidity.
An interlayer film with a water content of . After preparation, two sheets thickness 3
■Put it between two glasses and press it at 130±5℃, 1
A laminated glass sample was prepared by heating and pressurizing it for 5 minutes under the condition of 3±0.5 kg/c-.

Evaluation of Light Blocking Properties The light transmittance of the laminated glass samples at wavelengths of 250 to 700 nm was measured using a spectrometer. As a result, the maximum wavelength and maximum cutoff wavelength at which the light transmittance was 0% was 4]0nI11.

Moreover, the light transmittance was 70% or more in the wavelength range of 450 to 700 r++n, and the light density was maintained.

The turbidity was evaluated by observing whether there was turbidity at the edge of a 100 W white light bulb image through a turbid laminated glass.

As a result, it was confirmed that there was no turbidity.

As an indicator of yellowish tinge, the light transmittance at a wavelength of 420 nm was measured and was 50% or more. A ratio of 50% or more indicates good transparency.

The laminated glass of adhesive sample was 118±0. Cool to 5℃,
The glass was broken by hitting it with a hammer, and the exposed area ratio of the interlayer film that was peeled off from the interlayer film was measured for the glass fragments.

Equal adsorption was performed by comparing the exposed interlayer film area ratio between the standard sample for adhesion evaluation and the above-mentioned glass fragments.

The grades range from 0#, where the exposed area ratio is 100% where the glass has completely peeled off, to 5# where the exposed area ratio is 50%, and 10# where the exposed area ratio is 0% where the glass has not peeled off at all. In practice, at least 3# or more is required.

As a result, the grade was 4 or 5, indicating good adhesion.

The type and concentration of the light absorbing agent, the type and concentration of the light scattering agent, and the evaluation of the laminated glass are summarized in Table 1 below.

Example 2 In the example described in Example 1, gold powder (
An interlayer film was prepared in the same manner as in the same series except that a particle size range of 300 to 400 nm) was used, and the performance of a laminated glass using this interlayer film was evaluated. The results are shown in Table 1.

A diagram showing the light transmission characteristics of the laminated glass in this example is shown below.
Along with the light transmission characteristics of the comparative thickness 6 dragon single glass, the first
As shown in the figure.

Example 3 In the example described in Example 1, copper powder (
An interlayer film was prepared in the same manner as in the same series except that a particle size range of 300 to 400 nII) was used, and the performance of a laminated glass using this interlayer film was evaluated. The results are shown in Table 1.

Example 4 An interlayer film was prepared in the same manner as in Example 1 except that silicon dioxide powder (particle size range 300 to 400 n [Il) was used as the light scattering agent, and this interlayer film was used. The performance of the laminated glass was evaluated. The results are shown in Table 1.

Example 5 An interlayer film was prepared in the same manner as in Example 1 except that titanium oxide powder (particle size range O to 40011I11) was used as a light scattering agent, and a laminated glass using this interlayer film was prepared. We evaluated the performance of The results are shown in Table 1.

Example 6 An interlayer film was prepared in the same manner as in Example 1 except that aluminum oxide powder (particle size range 300 to 400 nm) was used as a light scattering agent, and a laminated glass using this interlayer film was prepared. We evaluated the performance of

The results are shown in Table 1.

Example 7 An interlayer film was prepared in the same manner as in Example 1 except that silicon dioxide powder (particle size range 250 to 350 nII) was used as a light scattering agent, and this interlayer film was used. The performance of the laminated glass was evaluated.The results are shown in Table 1.

Example 8 An interlayer film was prepared in the same manner as in Example 1 except that silicon dioxide powder (particle size range 350 to 400 ng+) was used as a light scattering agent, and this interlayer film was used. The performance of laminated glass was evaluated. The results are shown in Table 1.

Example 9 An interlayer film was prepared in the same manner as in Example 1 except that aluminum powder (particle size range 350 to 400 n11) was used as a light scattering agent, and a composite film using this interlayer film was prepared. The performance of the glass was evaluated. The results are shown in Table 1.

Example 10 In the example described in Example 1, using silicon dioxide powder (particle size range 250-350 nal) as a light scattering agent,
An interlayer film was prepared in the same manner as in the case of spinning, except that the concentration of the light scattering agent was changed to 15% by weight, and the performance of a laminated glass using this interlayer film was evaluated. The results are shown in Table 1.

Example 11 In the example described in Example 1, silicon dioxide powder (particle size range 250-350 nm) was used as the light scattering agent, the concentration of the light scattering agent was 15% by weight, and the concentration of the light absorbing agent was 0.
An interlayer film was prepared in the same manner as for spinning except that the amount was 5% by weight, and the performance of a laminated glass using this interlayer film was evaluated. The results are shown in Table 1.

Example 12 In the example described in Example 1, silicon dioxide powder (particle size range 350-400 nm) was used as the light scattering agent, the concentration of the light scattering agent was 15% by weight, and the concentration of the light absorbing agent was 5% by weight.
An interlayer film was prepared in the same manner as in the spinning process except that the amount was changed to 0% by weight, and the performance of a laminated glass using this interlayer film was evaluated. The results are shown in Table 1.

Example 13 In the example described in Example 1, using silicon dioxide powder (particle size range 350-400 no.) as the light scattering agent,
The concentration of the light scattering agent was set to 3% by weight, and the 78° of the light absorbing agent was set to 0.
．． An interlayer film was prepared in the same manner as for spinning except that the amount was 5% by weight, and the performance of a laminated glass using this interlayer film was evaluated. The results are shown in Table 1.

Example 14 In the example described in Example 1, silicon dioxide powder (particle size range 350-400 nm) was used as the light scattering agent, the concentration of the light scattering agent was 5% by weight, and the above-mentioned exemplary structural formula 1b was used.
An interlayer film was prepared in the same manner as in the case of spinning, except that a light absorber corresponding to the above was used, and the performance of laminated glass using this interlayer film was evaluated. The results are shown in Table 1.

Example 15 In the example described in Example 14, the above-described exemplary structural formula I
An interlayer film was prepared in the same manner as in the case of spinning, except that a light absorbent corresponding to item c was used, and the performance of a laminated glass using this interlayer film was evaluated. The results are shown in Table 1.

Example 16 In the example described in Example 14, the above-mentioned exemplary structural formula r
An interlayer film was prepared in the same manner as in the case of spinning, except that a light absorbent corresponding to d was used, and the performance of a laminated glass using this interlayer film was evaluated. The results are shown in Table 1.

Example 17 In the example described in Example 14, the above-mentioned exemplary structural formula 1
An interlayer film was prepared in the same manner as in the case of spinning, except that a light absorbent corresponding to e was used, and the performance of a laminated glass using this interlayer film was evaluated. The results are shown in Table 1.

Example 18 In the example described in Example 14, the above-described exemplary structural formula I
An interlayer film was prepared in the same manner as in the case of spinning, except that a light absorbent corresponding to f was used, and the performance of a laminated glass using this interlayer film was evaluated. The results are shown in Table 1.

Example 19 In the example described in Example 14, the above-mentioned exemplary structural formula 1
An interlayer film was prepared in the same manner as in the case of spinning, except that a light absorbent corresponding to item (g) was used, and the performance of a laminated glass using this interlayer film was evaluated. The results are shown in Table 1.

Example 20 In the example described in Example 14, the aforementioned exemplary structural formula n
An interlayer film was prepared in the same manner as in the same example except that a light absorbent corresponding to a was used, and the performance of a laminated glass using this interlayer film was evaluated. The results are shown in Table 1.

Example 21 In the example described in Example 14, the aforementioned exemplary structural formula n
An interlayer film was prepared in the same manner as in the same example except that a light absorbent corresponding to b was used, and the performance of a laminated glass using this interlayer film was evaluated. The results are shown in Table 1.

Example 22 In the example described in Example 14, the above-mentioned exemplary structural formula 1
An interlayer film was prepared in the same manner as in the same example except that a light absorbent corresponding to 1c was used, and the performance of a laminated glass using this interlayer film was evaluated. The results are shown in Table 1.

Example 23 In the example described in Example 14, the above-described exemplary structural formula I
An interlayer film was prepared in the same manner as in the same example except that a light absorber corresponding to Id was used, and the performance of a laminated glass using this interlayer film was evaluated. The results are shown in Table 1.

Comparative Example 1 In the example described in Example 1, conventional 2 of the following structural formula
(2'-Hydroxy-5'-methylphenyl)benzotriazole was used, and the concentration of the light absorber was adjusted to 0. An interlayer film was prepared in the same manner as in the same example except that the concentration was 6% by weight and no light scattering agent was used, and the performance of the laminated glass was evaluated.

The results are shown in Table 1. As can be seen from this result, the maximum cutoff wavelength was only 385 nm.

Comparative Example 2 In the example described in Example 1, a benzotriazole derivative having the above structural formula was used, and the concentration of the light absorber was 5.0% by weight.
An interlayer film was prepared in the same manner as in the same example except that no light scattering agent was used, and the performance of the laminated glass was evaluated.

The results are shown in Table 1. As can be seen from the results, the adhesiveness τi was 2.5#, and it was yellowish.

Comparative Example 3 An interlayer film was prepared in the same manner as in Example 1 except that no light scattering agent was used, and the performance of the laminated glass was evaluated.

The results are shown in Table 1. As can be seen from this result, the maximum cutoff wavelength was only 390 nm.

Comparative Example 4 In the example described in Example 7, the particle size range of the light scattering agent was
An interlayer film was prepared in the same manner as in the same example except that the thickness was 50 to 230 nm, and the performance of the laminated glass was evaluated.

The results are shown in Table 1. As can be seen from this result, the maximum cutoff wavelength was only 390 nm.

Comparative Example 5 In the example described in Example 7, the particle size range of the light scattering agent was changed to 4.
20-b An interlayer film was prepared and the performance of the laminated glass was evaluated.

The results are shown in Table 1. As can be seen from this result, there was turbidity.

Comparative Example 6 In the example described in Example 9, the particle size range of the light scattering agent was changed to 4.
Same as the same example except that the interlayer was 20 to 500 nIm.
The performance of the laminated glass was evaluated.

The results are shown in Table 1. As can be seen from this result, there was turbidity.

Comparative Example 7 In the example described in Example 10, the concentration of the light scattering agent was changed to 20
An interlayer film was prepared in the same manner as in the same example except that the weight % was used, and the performance of the laminated glass was evaluated.

The results are shown in Table 1. As can be seen from this result, there was turbidity.

Comparative Example 8 In the example described in Example 11, the concentration of the light absorber was set to 0.
An interlayer film was prepared in the same manner as in the same example except that the weight was changed to 2 and 96, and the performance of the laminated glass was evaluated. The results are shown in Table 1. As can be seen from this result, the maximum cutoff wavelength was only 398 ni.

Comparison ρ19 In the example described in Example 11, the concentration of the light absorber was set to 7.
An interlayer film was prepared in the same manner as in the same example except that the content was 0% by weight, and the performance of the laminated glass was evaluated. The results are shown in Table 1. As can be seen from this result, the glass had a yellowish tint and was cloudy.

Comparative Example 10 In the example described in Example 13, the concentration of the light scattering agent was 1!
An interlayer film was prepared in the same manner as in the same column except that the amount of Ii was changed to %, and the performance of the laminated glass was evaluated. The results are shown in Table 1. As can be seen from this result, the maximum cutoff wavelength was only 397nn+.

Comparative example 1 Comparative example 2 Comparative example 3 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative example 4 Example 7 Example 8 Comparative example 5 Example 9 Comparative example 6 Example IO Comparative example 7 (wt%) 0, 6 5,0 0, 6 0, 6 0, 6 0, 6 0, 6 0, 6 0, 6 0, 6 0, 6 0, 6 0, 6 0, 6 0, 6 0, 6 0, 6 No. (-'t%) Aluminum 5 Gold 5 Copper 5 Silicon dioxide 5 Titanium oxide 5 Aluminum oxide 5 Silicon dioxide 5 Silicon dioxide 5 Silicon dioxide 5 Silicon dioxide 5 Aluminum 5 Aluminum 5 Silicon dioxide 15 Silicon dioxide 20 table (IIll) laminated glass performance (IIm) (T%) none Yes (43) none none none none none none none none none none none none none none none Ku#) 5,0 2, 5 5,0 4, 5 4, 5 4.5 5,0 4, 5 4.5 5, 5 5,0 5,0 4, 5 5,0 4, 5 3, 5 3,0 none none none none none none none none none none none none Yes none Yes none Yes Table 1 (continued) Comparative example 8 Example 11 Example 12 Comparative example 9 Comparative example 10 Example 13 Example 14 Example 15 Example 16 Example 17 Example 18 Example 19 Example 20 Example 21 Example 22 Example 23 (Vt%) 0, 2 0, 5 0.5 7,0 0, 5 0, 5 0, 6 0, 6 0, 6 0, 6 0, 6 0, 6 0.6 0, 6 0, 6 (ν [%) Silicon oxide 15 Silicon oxide 15 Silicon oxide 15 Silicon oxide 15 Silicon oxide 1 Silicon oxide 3 Silicon oxide 5 Silicon oxide 5 Silicon oxide 5 Silicon oxide 5 Silicon oxide 5 Silicon oxide 5 Silicon oxide 5 Silicon oxide 5 Silicon oxide 5 Silicon oxide 5 (IIap) (IIap) (1%) (#) None 3.5 None 5.0 None 5.0 Yes (47) 3. 0 None 3.5 None 5.0 None 4.0 None 4.0 None 4.0 None 4.5 None 4.0 None 4.0 None 4.0 None 4.0 None 3.0 None 3.5 none none none Yes none none none none none none none none none none none none Note) The symbol for the type of light absorber is This corresponds to the exemplary structural formula of the light absorbent.

[Effects of the Invention] As demonstrated by the above examples, the present invention has the following effects.

The short-wavelength light blocking interlayer film for laminated glass according to claim 1 does not require special formulations or surface processing techniques such as those for special compounded glass or special surface treated glass, and can be applied at low cost and easily. , 400nllll or less short wavelength light can be selectively blocked.

In the short-wavelength light-blocking interlayer film for laminated glass according to claim 1, specific light absorbers and light scattering agents are added to the polyvinyl bityral resin, so that the adhesion of the interlayer film to the glass is not inhibited. Good short-wavelength light blocking performance can be imparted to laminated glass.

Wavelength (IIm)

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the light transmission characteristics of the short wavelength blocking laminated glass A1 and the single glass B of Example 2 using the interlayer film according to the present invention.

Claims (1)

[Scope of Claims] 1. A benzotriazole derivative represented by the following general formula (I) and a benzotriazole derivative represented by the following general formula (II) ▲There are mathematical formulas, chemical formulas, tables, etc.▼... I ▲Mathematical formula , chemical formulas, tables, etc.▼...II [In the formula, X^1 and X^2 are the same or different and represent hydrogen, halogen, nitro group, amino group, or substituted amino group, and R^1 , R^2 and R^3 are the same or different and represent an alkyl group having 1 to 4 carbon atoms, and n is an integer of 1 to 10.] At least one light absorber selected from the group consisting of and,
It is made of a plasticized polyvinyl butyral resin containing at least 90% by weight of a fine particulate inorganic material with a particle size distribution in the particle size range of 250 to 400 nm, and substantially blocks light with a wavelength of 400 nm or less and 450 nm or more. An interlayer film for short-wavelength light-blocking laminated glass, which is characterized by substantially transmitting light having a wavelength of . 2. Claim 1, wherein the content of the light absorber is 0.4 to 6% by weight, and the content of the particulate inorganic substance is 2 to 17% by weight.
The interlayer film for laminated glass that blocks short wavelength light rays as described above.