JP2010024061A - Interlayer for light-diffusible laminated glass, and laminated glass - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an interlayer for light-diffusible laminated glass, which suppresses generation of resinous deposit during extrusion molding and is excellent in dispersion of light-diffusible fine particles, and to provide laminated glass obtained by using the same. <P>SOLUTION: This invention relates to the interlayer for light-diffusible laminated glass, wherein a thermoplastic resin layer (C) is inserted between a thermoplastic resin layer (A) and a thermoplastic resin layer (B). The thermoplastic resin layer (A) and the thermoplastic resin layer (B) each contains a thermoplastic resin having a melt flow rate of 1-15 g/10 min, and the thermoplastic resin layer (C) contains a thermoplastic resin having a melt flow rate of 4-15 g/10 min and light-diffusible fine particles. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to an interlayer film for light diffusing laminated glass that can suppress the occurrence of a scum during extrusion molding and is excellent in dispersibility of light diffusing fine particles. The present invention also relates to a laminated glass using the intermediate film for light diffusing laminated glass.

Laminated glass is safe even if it is damaged by an external impact and glass fragments are not scattered. For this reason, the laminated glass is widely used as a window glass for vehicles such as automobiles, aircraft, and buildings. As such a laminated glass, a laminated glass containing a thermoplastic resin such as polyvinyl acetal, ethylene-vinyl acetate copolymer, ethylene-acrylic copolymer, polyurethane, polyvinyl alcohol or the like between at least two sheets of glass. The laminated glass which integrated the intermediate film for use was mentioned.

Conventionally, a light diffusing laminated glass in which an intermediate film for light diffusing laminated glass containing light diffusing fine particles such as calcium carbonate and silica is sandwiched between at least two transparent glass plates is known (for example, Patent Document 1). Such a light diffusing laminated glass transmits light but does not allow a person or an object behind the laminated glass to be visually recognized, so that it is used in applications requiring daylighting and privacy.

As a method for obtaining a haze value necessary for maintaining privacy, for example, as disclosed in Patent Document 1, a method of mixing a large amount of light diffusing fine particles with a thermoplastic resin can be mentioned. However, when a thermoplastic resin composition containing a large amount of light diffusing fine particles is extruded by an extruder, a large amount of deposits (hereinafter also referred to as “meani”) may be generated on the die lip of the extruder. Furthermore, there has been a problem that mayani adheres to the intermediate film for light diffusing laminated glass during extrusion molding. In addition, "Meani" means the deposit derived from the resin composition.

As a method for solving such a problem, for example, as described in Patent Document 2, an interlayer film for laminated glass in which at least three resin layers are laminated, and at least one other than the outermost layer is used. A method for uniformly dispersing light diffusing fine particles in a layer has been studied.

However, such an interlayer film for light diffusing laminated glass can suppress the occurrence of scum, but the light diffusing fine particles are aggregated or the light diffusing fine particles are not sufficiently dispersed. There was a problem that color unevenness was likely to occur in the intermediate film.
Japanese Examined Patent Publication No. 2-56295 JP-A-7-330391

An object of the present invention is to provide an intermediate film for light diffusable laminated glass that can suppress the occurrence of a scum during extrusion molding and is excellent in the dispersibility of light diffusing fine particles. Another object of the present invention is to provide a laminated glass using the interlayer film for light diffusing laminated glass.

The present invention is an intermediate film for light diffusing laminated glass in which a thermoplastic resin layer (C) is sandwiched between a thermoplastic resin layer (A) and a thermoplastic resin layer (B). The thermoplastic resin layer (A) and the thermoplastic resin layer (B) contain a thermoplastic resin having a melt flow rate of 1 to 15 g / 10 min, and the thermoplastic resin layer (C) has a melt flow rate of This is an intermediate film for light diffusing laminated glass containing a thermoplastic resin of 4 to 15 g / 10 min and light diffusing fine particles.
The present invention is described in detail below.

In the intermediate film for light diffusing laminated glass in which the thermoplastic resin layer (C) is sandwiched between the thermoplastic resin layer (A) and the thermoplastic resin layer (B), the present inventors It was studied to define the melt flow rate value of the thermoplastic resin contained in the plastic resin layer within a specific range. As a result, the present inventors can obtain an interlayer film for light diffusing laminated glass that can suppress the occurrence of scum during extrusion molding and is excellent in dispersibility of light diffusing fine particles. The headline and the present invention have been completed.

In the interlayer film for light diffusing laminated glass of the present invention, the thermoplastic resin layer (C) is sandwiched between the thermoplastic resin layer (A) and the thermoplastic resin layer (B). The interlayer film for light diffusing laminated glass of the present invention has three layers in which the thermoplastic resin layer (A), the thermoplastic resin layer (C), and the thermoplastic resin layer (B) are sequentially laminated. It may be a structure. Moreover, the intermediate film for light diffusable laminated glass of this invention is the said thermoplastic resin layer (C) and the said thermoplastic resin between the said thermoplastic resin layer (A) and the said thermoplastic resin layer (B). A resin layer other than the layer (C) may be sandwiched.

The thermoplastic resin layer (C) contains a thermoplastic resin having a melt flow rate (hereinafter also referred to as MFR) of 4 to 15 g / 10 minutes.
Since the thermoplastic resin layer (C) contains a thermoplastic resin having an MFR of 4 to 15 g / 10 min, the light diffusing fine particles are uniformly dispersed in the thermoplastic resin layer (C). Color unevenness of the interlayer film for diffusible laminated glass does not occur.

The lower limit of the MFR of the thermoplastic resin in the thermoplastic resin layer (C) is 4 g / 10 minutes, and the upper limit is 15 g / 10 minutes. When the MFR of the thermoplastic resin is less than 4 g / 10 minutes, the light diffusing fine particles are not uniformly dispersed in the thermoplastic resin layer (C), so that color unevenness of the intermediate film for light diffusing laminated glass occurs. To do. If the MFR of the thermoplastic resin exceeds 15 g / 10 min, the thermoplastic resin layer (C) becomes flexible, and the film thickness of the intermediate film for light diffusing laminated glass cannot be controlled. Furthermore, since the light diffusing fine particles are not uniformly dispersed in the thermoplastic resin layer (C), color unevenness of the intermediate film for light diffusing laminated glass occurs. The minimum with preferable MFR of the said thermoplastic resin is 6 g / 10min.
Here, MFR can be measured based on JISK7210 (1999), for example using a melt indexer ("LMI4000 series" by Dynasico Polymer Test).

The thermoplastic resin having an MFR of 4 to 15 g / 10 minutes is not particularly limited, and examples thereof include a thermoplastic resin in which the MFR is adjusted to 4 to 15 g / 10 minutes by appropriately adjusting the molecular weight, the monomer ratio of the polymerization component, and the like. . The thermoplastic resin is not particularly limited, and polyvinyl acetal resin such as polyvinyl butyral (PVB), ethylene-vinyl acetate copolymer (EVA), polyethylene resin (PE), a derivative of polyethylene resin (PE), polypropylene resin (PP ), Derivatives of polypropylene resin (PP), polycarbonate resin (PC), polycarbonate resin (PC) derivatives, and the like. Especially, it is preferable that the said thermoplastic resin is an ethylene-vinyl acetate copolymer (EVA).

The thermoplastic resin layer (C) contains light diffusing fine particles.
By dispersing an appropriate amount of light diffusing fine particles uniformly in the thermoplastic resin layer (C), the light diffusing fine particles appropriately refract and reflect light incident from various angles. As a result, the intermediate film for light diffusing laminated glass of the present invention can diffuse light, block the visual field, and transmit a large amount of light.

The light diffusing fine particles are not particularly limited, and examples thereof include inorganic pigments, inorganic beads, and organic beads.
The inorganic pigment is not particularly limited, and examples thereof include milky white inorganic pigments such as calcium carbonate, alumina, kaolin clay, talc, calcium silicate, magnesium oxide, magnesium carbonate, and barium carbonate.
The inorganic beads are not particularly limited, and examples thereof include glass beads and silica gel beads.
The organic beads are not particularly limited, and examples thereof include organic beads having a high molecular polymer such as an acrylic polymer, a styrene polymer, and an acrylic-styrene copolymer polymer as a constituent component. In addition, it is preferable that the said high molecular polymer has a crosslinked structure.

The shape of the light diffusing fine particles is not particularly limited, and examples thereof include powders, crystals, spheres, fibers, and flakes. Among these, it is preferable to use one kind or a combination of two or more kinds of powder, crystal or spherical light diffusing fine particles. In particular, since the intermediate film for light diffusing laminated glass having both high total light transmittance and high haze value can be obtained, the shape of the light diffusing fine particles is preferably spherical. In addition, that both the total light transmittance and the haze value are high indicates that the total light transmittance is 70% or more and the haze value is 80% or more.

The volume average particle size of the light diffusing fine particles is not particularly limited, but a preferable lower limit is 0.1 μm and a preferable upper limit is 10 μm. If the volume average particle size of the light diffusing fine particles is less than 0.1 μm, the haze value necessary for maintaining privacy may not be obtained. When the volume average particle diameter of the light diffusing fine particles exceeds 10 μm, the light diffusing fine particles may not be dispersed. The more preferable lower limit of the volume average particle diameter of the light diffusing fine particles is 0.5 μm, and the more preferable upper limit is 5 μm.

The content of the light diffusing fine particles is not particularly limited, but a preferred lower limit is 1 part by weight and a preferred upper limit is 10 parts by weight with respect to 100 parts by weight of the thermoplastic resin. If the content of the light diffusing fine particles is less than 1 part by weight, the haze value necessary for maintaining privacy may not be obtained. When the content of the light diffusing fine particles exceeds 10 parts by weight, the light diffusing fine particles may not be dispersed. A more preferable lower limit of the content of the light diffusing fine particles is 3 parts by weight, and a more preferable upper limit is 8 parts by weight.

The thermoplastic resin layer (C) is optionally made of a plasticizer, an adhesion modifier, a light-shielding agent, various colorants such as pigments and dyes, an antioxidant, a light stabilizer, a flame retardant, an antistatic agent, You may contain additives, such as a moisture-proof agent, a ultraviolet absorber, a heat ray reflective agent, a heat ray absorber, and a silane coupling agent.

The plasticizer is not particularly limited, and examples thereof include organic ester plasticizers and phosphate plasticizers. The organic ester plasticizer is not particularly limited, and examples thereof include monobasic organic acid esters and polybasic organic acid esters. The phosphoric acid plasticizer is not particularly limited, and examples thereof include an organic phosphoric acid plasticizer and an organic phosphorous acid plasticizer. The plasticizer is preferably a liquid plasticizer.
The monobasic organic acid ester is not particularly limited, and examples thereof include glycols such as triethylene glycol, tetraethylene glycol, and tripropylene glycol, butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptylic acid, and n-octyl. Examples thereof include glycol ester compounds obtained by reaction with monobasic organic acids such as acid, 2-ethylhexylic acid, pelargonic acid (n-nonyl acid), and decyl acid. Among them, triethylene glycol dicaproic acid ester, triethylene glycol di-2-ethylbutyric acid ester, triethylene glycol di-n-octylic acid ester, triethylene glycol di-2-ethylhexyl acid ester and the like triethylene glycol dialkyl acid Esters are preferred.

The polybasic organic acid ester is not particularly limited. For example, an ester compound of a polybasic organic acid such as adipic acid, sebacic acid, or azelaic acid and an alcohol having a linear or branched structure having 4 to 8 carbon atoms. Is mentioned. Of these, dibutyl sebacic acid ester, dioctyl azelaic acid ester, dibutyl carbitol adipic acid ester and the like are preferable.

The organic ester plasticizer is not particularly limited, and triethylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylhexanoate, triethylene glycol dicaprylate, triethylene glycol di-n-octanoate, Triethylene glycol di-n-heptanoate, tetraethylene glycol di-n-heptanoate, dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate, ethylene glycol di-2-ethylbutyrate, 1,3-propylene glycol di-2 -Ethyl butyrate, 1,4-propylene glycol di-2-ethyl butyrate, 1,4-butylene glycol di-2-ethyl butyrate, 1,2-butylene glycol di-2-ethylene butyrate, diethylene glycol Rudi-2-ethylbutyrate, diethylene glycol di-2-ethylhexanoate, dipropylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylpentanoate, tetraethylene glycol di-2-ethylbutyrate Rate, diethylene glycol dicapriate, tetraethylene glycol di-2-ethylhexanoate, triethylene glycol di-n-heptanoate, tetraethylene glycol di-n-heptanoate, triethylene glycol bis-2-ethylbutyrate, triethylene Glycol di-2-ethylhexanoate, triethylene glycol diheptanoate, tetraethylene glycol diheptanoate, dihexyl adipate, dioctyl adipate, hexylcycloadipate Xyl, a mixture of heptyl adipate and nonyl adipate, diisononyl adipate, heptylnonyl adipate, dibutyl sebacate, alkyd oil-modified sebacic acid, a mixture of phosphate plasticizer and adipate, adipate, etc. .

The organophosphate plasticizer is not particularly limited, and examples thereof include tributoxyethyl phosphate, isodecylphenyl phosphate, triisopropyl phosphate, and the like.

Among the above plasticizers, triethylene glycol di-2-ethylhexanoate (3GO), triethylene glycol di-2-ethylbutyrate (3GH), tetraethylene glycol di-2-ylate are difficult to cause hydrolysis. Ethylhexanoate (4GO) and dihexyl adipate (DHA) are preferable, and triethylene glycol di-2-ethylhexanoate (3GO) is more preferable.

The said light shielding agent is not specifically limited, For example, carbon black, red iron oxide, etc. are mentioned. The colorant is preferably a pigment, and includes carbon black, red pigment (CI Pigment red), blue pigment (CI Pigment blue), and yellow pigment (CI Pigment yellow). Examples thereof include mixed pigments.

The said ultraviolet absorber is not specifically limited, For example, ultraviolet absorbers, such as a malonic acid ester compound, an oxalic acid anilide compound, a benzotriazole compound, a benzophenone compound, a triazine compound, a benzoate compound, a hindered amine compound, are mentioned. The benzotriazole compound is not particularly limited. For example, 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-t-butylphenyl) Benzotriazole, 2- (2′-hydroxy-3′-t-butyl-5′-methylphenyl) -5-chlorobenzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-amylphenyl) Benzotriazole, 2,2-methylenebis [4- (1,1,3,3-tetramethylbutyl-6- (2H-benzotriazol-2-yl) phenol], 2- (2H-benzotriazol-2-yl) ) -4,6-di-t-pentylphenol.

The antioxidant is not particularly limited. For example, 2,6-di-t-butyl-p-cresol (BHT), butylated hydroxyanisole (BHA), 2,6-di-t-butyl-4-ethyl Phenol, stearyl-β- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, 2,2′-methylenebis- (4-methyl-6-butylphenol), 2,2′-methylenebis- (4 -Ethyl-6-tert-butylphenol), 4,4'-butylidene-bis (3-methyl-6-tert-butylphenol), 1,1,3-tris- (2-methyl-hydroxy-5-tert-butyl) Phenylbutane, tetrakis- [methylene-3- (3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionate] methane, 1,3,3-tris- (2-me 4-hydroxy-5-tert-butylphenol) butane, 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene, bis (3 , 3′-t-butylphenol) butyric acid) glycol ester, t-butylhydroxytoluene, pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] and the like Can be mentioned.

The said silane coupling agent is not specifically limited, For example, the silane compound which has an amino group, a glycidyl group, etc. is mentioned.

The thickness of the said thermoplastic resin layer (C) is not specifically limited, It can set suitably. For example, when the thickness of the intermediate film for light diffusing laminated glass of the present invention is 400 μm, the preferred lower limit of the thickness of the thermoplastic resin layer (C) is 100 μm, and the preferred upper limit is 360 μm. When the thickness of the thermoplastic resin layer (C) is less than 100 μm, the thickness of the thermoplastic resin layer (C) may not be controlled. When the thickness of the thermoplastic resin layer (C) exceeds 360 μm, the thickness of the thermoplastic resin layers (A) and (B) described later may not be controlled. The more preferable lower limit of the thickness of the thermoplastic resin layer (C) is 200 μm, and the more preferable upper limit is 350 μm.

In the intermediate film for light diffusing laminated glass of the present invention, the thermoplastic resin layers (A) and (B) suppress the generation of a scum during extrusion molding. Further, the thermoplastic resin layers (A) and (B) adjust the adhesive force between the intermediate film for light diffusing laminated glass and the glass plate, and between the intermediate film for light diffusing laminated glass and the glass plate. In addition, the generation of fine bubbles is prevented.

The thermoplastic resin layers (A) and (B) contain a thermoplastic resin having an MFR of 1 to 15 g / 10 min. The thermoplastic resin layers (A) and (B) contain a thermoplastic resin having an MFR of 1 to 15 g / 10 minutes, thereby providing an adhesive force between the interlayer film for light diffusing laminated glass and the glass plate. Can be adjusted.

The lower limit of MFR of the thermoplastic resin in the thermoplastic resin layers (A) and (B) is 1 g / 10 minutes, and the upper limit is 15 g / 10 minutes. When the MFR of the thermoplastic resin is less than 1 g / 10 minutes, the thickness of the thermoplastic resin layers (A) and (B) cannot be controlled. When the MFR of the thermoplastic resin exceeds 15 g / 10 min, sufficient adhesive force cannot be obtained between the light diffusing laminated glass interlayer film and the glass plate. The minimum with preferable MFR of the said thermoplastic resin is 6 g / 10min.

The thermoplastic resin having an MFR of 1 to 15 g / 10 min is not particularly limited, and examples thereof include a thermoplastic resin having an MFR adjusted to 1 to 15 g / 10 min by appropriately adjusting the molecular weight, the monomer ratio of the polymerization component, and the like. . The thermoplastic resin is not particularly limited, and polyvinyl acetal resin such as polyvinyl butyral (PVB), ethylene-vinyl acetate copolymer (EVA), polyethylene resin (PE), a derivative of polyethylene resin (PE), polypropylene resin (PP ), Derivatives of polypropylene resin (PP), polycarbonate resin (PC), polycarbonate resin (PC) derivatives, and the like. Especially, it is preferable that the said thermoplastic resin is an ethylene-vinyl acetate copolymer (EVA).

The thermoplastic resin layers (A) and (B), as with the thermoplastic resin layer (C), may include various colorants such as a plasticizer, an adhesive strength modifier, a light-shielding agent, a pigment and a dye, as necessary. You may contain additives, such as antioxidant, a light stabilizer, a flame retardant, an antistatic agent, a moisture-resistant agent, a ultraviolet absorber, a heat ray reflective agent, a heat ray absorber, a silane coupling agent. The thermoplastic resin layers (A) and (B) preferably do not substantially contain the light diffusing fine particles.

The thicknesses of the thermoplastic resin layers (A) and (B) are not particularly limited and can be set as appropriate. For example, when the thickness of the interlayer film for light diffusing laminated glass of the present invention is 400 μm, the preferred lower limit of the thickness of the thermoplastic resin layers (A) and (B) is 20 μm, and the preferred upper limit is 150 μm. When the thickness of the thermoplastic resin layers (A) and (B) is less than 20 μm, the thickness of the thermoplastic resin layers (A) and (B) may not be controlled. When the thickness of the thermoplastic resin layers (A) and (B) exceeds 150 μm, the thickness of the thermoplastic resin layer (C) may not be controlled. The minimum with more preferable thickness of the said thermoplastic resin layer (A) and (B) is 25 micrometers, and a more preferable upper limit is 100 micrometers.

Although the thickness of the intermediate film for light diffusable laminated glass of this invention is not specifically limited, A preferable minimum is 200 micrometers and a preferable upper limit is 1000 micrometers. When the thickness of the interlayer film for light diffusing laminated glass is less than 200 μm, the penetration resistance of the laminated glass may be lowered. When the thickness of the interlayer film for light diffusing laminated glass exceeds 1000 μm, the thickness suitable for laminated glass may be exceeded. The more preferable lower limit of the thickness of the interlayer film for light diffusing laminated glass is 250 μm, and the more preferable upper limit is 800 μm.

The method for producing the interlayer film for light diffusing laminated glass of the present invention is not particularly limited, and the thermoplastic resin layers (A) and (B) and the thermoplastic resin layer (C) are simultaneously extruded. The method of laminating etc. is mentioned.

A laminated glass using the interlayer film for light diffusing laminated glass of the present invention is also one aspect of the present invention.
Although the glass plate used for the laminated glass of this invention is not specifically limited, The glass plate generally used can be used. For example, inorganic glass such as float plate glass, heat ray absorbing glass, polished plate glass, mold plate glass, mesh plate glass, wire plate glass, and the like can be mentioned. The glass plate may be an organic glass plate such as a polycarbonate plate or a polymethyl methacrylate plate. These glass plates may be used independently and 2 or more types may be used together. In addition, the thickness of a glass plate should just be suitably selected by a use, and although it does not specifically limit, the glass plate whose thickness of 1 sheet is 1-3 mm is preferable.

The manufacturing method of the laminated glass of this invention is not specifically limited. For example, the intermediate film for light diffusing laminated glass of the present invention is sandwiched between at least two glass plates, and this is passed through a pressing roll, or is put in a rubber bag and sucked under reduced pressure. Subsequently, it pre-adheres at 70-110 degreeC, deaerates the air which remains between a glass plate and the intermediate film for light diffusable laminated glass, and is set as a laminated body. Next, the laminated body is autoclaved or pressed and pressed at 120 to 150 ° C. with a pressure of 1 to 1.5 MPa to obtain a laminated glass.

According to the present invention, it is possible to provide an interlayer film for light diffusing laminated glass that can suppress the occurrence of a scum during extrusion molding and is excellent in dispersibility of light diffusing fine particles. Moreover, this invention can provide the laminated glass which uses this intermediate film for light diffusable laminated glasses.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

Example 1
(1) Preparation of thermoplastic resin composition (C) 8 parts by weight of calcium carbonate having a volume average particle size of 1.5 μm (“MC Coat S-15” manufactured by Maruo Calcium Co., Ltd.) as light diffusing fine particles, and an adhesive strength adjusting agent (Arakawa Chemical Industries "Alcon P115") 7 parts by weight and N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane 0.07 parts by weight as a silane coupling agent were dry blended, and the mixture was Obtained.
The obtained mixture and 100 parts by weight of an ethylene-vinyl acetate copolymer resin having an MFR of 6 g / 10 min were mixed to obtain a thermoplastic resin composition (C).

(2) Preparation of thermoplastic resin compositions (A) and (B) 6.5 parts by weight of an adhesive strength modifier (“Alcon P115” manufactured by Arakawa Chemical Industries, Ltd.) and N- (2-amino) as a silane coupling agent Ethyl) -3-aminopropylmethyldimethoxysilane (0.06 parts by weight) was dry blended to obtain a mixture.
The obtained mixture was mixed with 100 parts by weight of an ethylene-vinyl acetate copolymer resin having an MFR of 6 g / 10 min to obtain thermoplastic resin compositions (A) and (B).

(3) Intermediate film for light diffusing laminated glass and thermoplastic resin composition (A), (B) and (C) obtained by producing laminated glass are coextruded continuously for 24 hours to obtain a thermoplastic resin layer An intermediate film for light diffusing laminated glass in which (A), a thermoplastic resin layer (C) and a thermoplastic resin layer (B) were sequentially laminated was obtained. The thickness of the obtained interlayer film for light diffusing laminated glass was 400 μm. The thermoplastic resin layers (A) and (B) each had a thickness of 50 μm, and the thermoplastic resin layer (C) had a thickness of 300 μm.
The obtained interlayer film for light diffusing laminated glass was sandwiched between two transparent float glasses (length 30 cm × width 30 cm × thickness 2.5 mm) to prepare a laminate. The obtained laminate was put in a rubber bag, deaerated at a vacuum degree of 20 torr for 20 minutes, and then vacuum-pressed at 90 ° C. for 30 minutes to obtain a pre-pressed laminated glass. The pre-bonded laminated glass was autoclaved for 20 minutes under the conditions of 135 ° C. and pressure of 1176 kPa to obtain a laminated glass.

(Example 2)
For the light-diffusing laminated glass, in the same manner as in Example 1, except that an ethylene-vinyl acetate copolymer resin having an MFR of 1 g / 10 min was used in the production of the thermoplastic resin layers (A) and (B). An interlayer film and a laminated glass were obtained.

(Example 3)
An ethylene-vinyl acetate copolymer resin having an MFR of 4 g / 10 min was used in the production of the thermoplastic resin layer (C), and an MFR of 1 g / 10 min was used in the production of the thermoplastic resin layers (A) and (B). -An intermediate film for light diffusing laminated glass and laminated glass were obtained in the same manner as in Example 1 except that a vinyl acetate copolymer resin was used.

Example 4
In the production of the thermoplastic resin layer (C), an ethylene-vinyl acetate copolymer resin having an MFR of 15 g / 10 min was used, and in the production of the thermoplastic resin layers (A) and (B), an MFR of 1 g / 10 min was used. -An intermediate film for light diffusing laminated glass and laminated glass were obtained in the same manner as in Example 1 except that a vinyl acetate copolymer resin was used.

(Example 5)
In the production of the thermoplastic resin layer (C), an ethylene-vinyl acetate copolymer resin having an MFR of 15 g / 10 min was used, and in the production of the thermoplastic resin layers (A) and (B), an MFR was 15 g / 10 min. -An intermediate film for light diffusing laminated glass and laminated glass were obtained in the same manner as in Example 1 except that a vinyl acetate copolymer resin was used.

(Example 6)
An ethylene-vinyl acetate copolymer resin having an MFR of 4 g / 10 min was used in the production of the thermoplastic resin layer (C), and an MFR of 15 g / 10 min was used in the preparation of the thermoplastic resin layers (A) and (B). -An intermediate film for light diffusing laminated glass and laminated glass were obtained in the same manner as in Example 1 except that a vinyl acetate copolymer resin was used.

(Comparative Example 1)
In the production of the thermoplastic resin layer (C), an ethylene-vinyl acetate copolymer resin having an MFR of 1 g / 10 min was used, the thickness of the thermoplastic resin layer (C) was 200 μm, and the thermoplastic resin layers (A) and ( In the production of B), an ethylene-vinyl acetate copolymer resin having an MFR of 1 g / 10 min was used, and the thickness of the thermoplastic resin layers (A) and (B) was set to 100 μm, as in Example 1. Thus, an interlayer film for light diffusing laminated glass and laminated glass were obtained.

(Comparative Example 2)
In the production of the thermoplastic resin layer (C), an ethylene-vinyl acetate copolymer resin having an MFR of 1 g / 10 min was used, the thickness of the thermoplastic resin layer (C) was 260 μm, and the thermoplastic resin layers (A) and ( In the production of B), an ethylene-vinyl acetate copolymer resin having an MFR of 1 g / 10 min was used, and the thickness of the thermoplastic resin layers (A) and (B) was set to 70 μm, as in Example 1. Thus, an interlayer film for light diffusing laminated glass and laminated glass were obtained.

(Comparative Example 3)
An ethylene-vinyl acetate copolymer resin having an MFR of 1 g / 10 min was used in the production of the thermoplastic resin layer (C), and an MFR of 1 g / 10 min was used in the preparation of the thermoplastic resin layers (A) and (B). -An intermediate film for light diffusing laminated glass and laminated glass were obtained in the same manner as in Example 1 except that a vinyl acetate copolymer resin was used.

(Comparative Example 4)
In the production of the thermoplastic resin layer (C), an ethylene-vinyl acetate copolymer resin having an MFR of 1 g / 10 min is used, and in the production of the thermoplastic resin layers (A) and (B), the blending amount of the silane coupling agent is changed. An interlayer film for light diffusing laminated glass and laminated glass are obtained in the same manner as in Example 1 except that 0.07 part by weight and 8 parts by weight of calcium carbonate having a volume average particle size of 1.5 μm are added. It was.

(Comparative Example 5)
In the production of the thermoplastic resin layer (C), an intermediate film for light diffusable laminated glass was used in the same manner as in Example 1 except that an ethylene-vinyl acetate copolymer resin having an MFR of 1 g / 10 min was used. A laminated glass was obtained.

(Comparative Example 6)
An ethylene-vinyl acetate copolymer resin having an MFR of 20 g / 10 min in the production of the thermoplastic resin layer (C) was used, and an MFR of 1 g / 10 min in the production of the thermoplastic resin layers (A) and (B). -An intermediate film for light diffusing laminated glass and laminated glass were obtained in the same manner as in Example 1 except that a vinyl acetate copolymer resin was used.

(Comparative Example 7)
An ethylene-vinyl acetate copolymer resin having an MFR of 4 g / 10 min was used in the production of the thermoplastic resin layer (C), and an MFR of 20 g / 10 min was used in the production of the thermoplastic resin layers (A) and (B). -An intermediate film for light diffusing laminated glass and laminated glass were obtained in the same manner as in Example 1 except that a vinyl acetate copolymer resin was used.

<Evaluation>
The following evaluation was performed about the intermediate film for light diffusable laminated glasses obtained in Examples 1-6 and Comparative Examples 1-7, and a laminated glass. The results are shown in Tables 1 and 2.

(1) Observation of Meani When the intermediate film for light diffusing laminated glass was formed, the size of the meani attached to the die lip (length 2 mm × width 50 cm) of the extruder was visually observed. The size of the mean is the maximum mean width in the direction perpendicular to the discharge surface of the light diffusing laminated glass interlayer film. When the size of the mess 24 hours after the start of extrusion was 1.0 mm or less, it was evaluated as ◯, and when the size of the mess 24 hours after the start of extrusion exceeded 1.0 mm, it was evaluated as x. The extrusion speed was 7 kg / hr. In addition, the both ends of the width direction of the intermediate film for light diffusable laminated glass were cut | disconnected so that the length of the width direction of the intermediate film for light diffusable laminated glass might be 30 cm.

(2) Measurement of 180 degree peel strength The obtained intermediate film for light diffusable laminated glass (vertical 20 mm × horizontal 100 mm), PET film of vertical 20 mm × horizontal 100 mm × thickness 0.1 mm and vertical 20 mm × horizontal 100 mm × The laminate (PET film / interlayer film for light diffusing laminated glass / float glass) was obtained by sandwiching with float glass having a thickness of 2.5 mm. Next, the obtained laminate was put in a rubber bag, deaerated at a vacuum degree of 2.6 kPa for 20 minutes, and then vacuum pressed at 90 ° C. for 30 minutes. The laminated body that had been vacuum-pressed was passed through a pressing roll and pre-adhered at 110 ° C. while degassing the air remaining between the float glass and the intermediate film for light diffusing laminated glass. Subsequently, pressure bonding was performed in an autoclave at 135 ° C. under a pressure of 1.2 MPa for 20 minutes to obtain a laminated glass (PET film / interlayer film for light diffusing laminated glass / float glass).
The obtained laminated glass was fixed, the intermediate film for light diffusing laminated glass and the PET film were peeled off from the float glass, and the 180 degree peel strength at a tensile speed of 200 mm / min was measured. The 180 degree peel strength was measured with a constant-speed tensile tester ("Tensilon Universal Tester" manufactured by Orientec Co., Ltd.). In addition, the intermediate film for light diffusable laminated glass whose 180 degree | times peel strength exceeds 30 N / 20mm was set as the pass.

(3) Evaluation of dispersibility (Tv-D measurement)
In the width direction (length 30 cm) of the obtained interlayer film for light diffusing laminated glass, the visible light transmittances at five locations selected at intervals of 5 cm were measured using a spectrophotometer. The dispersibility of the light diffusing fine particles was evaluated by calculating the difference (Tv−D (maximum value (%) − minimum value (%))) between the maximum value and the minimum value of the visible light transmittance at five locations. . In addition, the intermediate film for light diffusable laminated glass whose difference of the maximum value of visible light transmittance and the minimum value is 1% or less was set as the pass.

According to the present invention, it is possible to provide an interlayer film for light diffusing laminated glass that can suppress the occurrence of a scum during extrusion molding and is excellent in the dispersibility of light diffusing fine particles. Moreover, this invention can provide the laminated glass which uses this intermediate film for light diffusable laminated glasses.

Claims (3)

An intermediate film for light diffusing laminated glass in which a thermoplastic resin layer (C) is sandwiched between a thermoplastic resin layer (A) and a thermoplastic resin layer (B),
The thermoplastic resin layer (A) and the thermoplastic resin layer (B) contain a thermoplastic resin having a melt flow rate of 1 to 15 g / 10 min, and the thermoplastic resin layer (C) has a melt flow. An intermediate film for light diffusing laminated glass, comprising a thermoplastic resin having a rate of 4 to 15 g / 10 min and light diffusing fine particles. The interlayer film for light diffusing laminated glass according to claim 1, wherein the thermoplastic resin is an ethylene-vinyl acetate copolymer. A laminated glass comprising the interlayer film for light diffusing laminated glass according to claim 1 or 2.