JPH08198974A - Resin kneading method and interlayer for laminated glass obtained thereby and laminated glass using the interlayer - Google Patents

Abstract

PURPOSE: To obtain an interlayer for laminated glass good in mainly transparency and adhesiveness and low in yellowing degree by a specific resin kneading means using an ethylene-vinyl acetate copolymer or ethylene-(meth)acrylic ester copolymer, and to obtain a laminated glass using this interlayer. CONSTITUTION: This interlayer for laminated glass is obtained by a resin kneading means comprising the following three processes: 1st step: a dibenzylidene sorbitol compound is added to an ethylene-vinyl acetate copolymer (EVA) or ethylene-(meth)acrylic ester copolymer (EEA) for the purpose of securing transparency of the copolymer followed by kneading and extruding the blend at >=150 deg.C to produce a high-concentration master batch; 2nd step: a silane coupling agent is added to EVA or EEA for the purpose of securing the adhesiveness of the copolymer to glass plates followed by kneading and extruding the blend at <=150 deg.C to produce another high-concentration master batch; and 3rd step: the above two kinds of master batch are kneaded with EVA or EEA followed by extrusion. The other objective laminated glass is obtained by using this interlayer.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a resin kneading method,
More specifically, the present invention relates to a method of kneading a resin with various additives having different kneading temperature conditions, an interlayer film for laminated glass obtained thereby, and a laminated glass using the same.

[0002]

2. Description of the Related Art Conventionally, between two transparent glass plates,
Laminated glass formed by sandwiching an interlayer film for laminated glass typified by plasticized polyvinyl butyral resin has an excellent feature that it has high strength and is hard to be damaged. For example, transportation equipment such as automobiles and aircraft, and construction. Widely used for window glass of objects.

However, the interlayer film for a laminated glass made of such a plasticized polyvinyl butyral resin has problems such as blocking during storage and complexity during a laminating process with a glass plate, and the drawbacks thereof are solved. For the purpose, Japanese Patent Publication No. 47-2103 or Japanese Patent Publication No. 2-53381
In the gazette and the like, an interlayer film for laminated glass made of an ethylene copolymer is proposed. In order to ensure transparency and prevent deterioration, the method for forming the intermediate film is to knead in a roll mill or the like and then form a sheet by extrusion molding or pressing.

[0004]

However, in the conventional method for forming a resin film mainly used as an intermediate film for laminated glass, an additive for ensuring the transparency of the resin film, and a glass plate and a resin film are used. The additives for ensuring the adhesiveness of No. 1 have mutually opposite extruding resin temperature conditions. Therefore, when these additives are mixed and molded at the same time, if the temperature of the extruded resin is set to a certain temperature or lower, the melting of the additives for expressing the transparency becomes incomplete,
Sufficient transparency cannot be obtained. On the other hand, when the temperature of the extruded resin is higher than a certain temperature, the additive that develops the adhesive property is yellowed. Therefore, considerable skill is required to fully realize the function of each additive.

Therefore, an object of the present invention is to solve the above problems, that is, in a method of molding a resin film mainly used as an intermediate film for laminated glass, a transparent resin having contradictory extruded resin temperature conditions is used. And an additive for ensuring adhesiveness between the glass plate and the resin film, each of which is capable of sufficiently exhibiting the intended function, and a combination obtained thereby. An object is to provide an intermediate film for glass and a laminated glass using the same.

[0006]

To achieve the above object, the present invention provides an ethylene-vinyl acetate copolymer selected from the group consisting of a dibenzylidene sorbitol compound, an amino group, a glycidyl group and a mercapto group. A method for kneading a silane coupling agent having at least one type of group described above, wherein the ethylene-vinyl acetate copolymer and the above-mentioned dibenzylidene sorbitol compound are kneaded at an extrusion resin temperature of 150 ° C. or higher, A step of obtaining a high-concentration masterbatch of the benzylidene sorbitol compound, and the ethylene-vinyl acetate copolymer and the silane coupling agent are kneaded at an extrusion resin temperature of 150 ° C. or lower to obtain a high-concentration masterbatch of the silane coupling agent. Step, and further, both of the master batches obtained in each of the above steps and the above ethylene-acetate vinyl acetate. To provide a resin kneading method which comprises a step of kneading the alcohol copolymer.

The present invention also provides a silane cup having an ethylene- (meth) acrylic acid ester copolymer and a dibenzylidene sorbitol compound and at least one group selected from the group consisting of an amino group, a glycidyl group and a mercapto group. A resin kneading method of kneading a ring agent, which comprises extruding the ethylene- (meth) acrylic acid ester copolymer and the dibenzylidene sorbitol compound at an extrusion resin temperature of 15
Kneading at 0 to 280 ° C. to obtain a master batch of high-concentration dibenzylidene sorbitol compound, and kneading the ethylene- (meth) acrylic acid ester copolymer and the silane coupling agent at an extrusion resin temperature of 70 to 150 ° C. And a step of obtaining a high-concentration silane coupling agent masterbatch, and a step of further kneading both the masterbatch obtained in each of the above steps and the ethylene- (meth) acrylic acid ester copolymer. A method for kneading a resin is provided.

Further, the present invention provides an interlayer film for laminated glass, which is obtained by the above resin kneading methods, and a laminated glass using the same.

The ethylene-vinyl acetate copolymer used in the present invention has a vinyl acetate component of 15 to 4 as its constituent component.
Those containing 0% by weight are preferable. The ethylene- (meth) acrylic acid ester copolymer used in the present invention is
It is preferable that the composition contains 15 to 40% by weight of a (meth) acrylic acid ester component. here,
Examples of the (meth) acrylic acid ester include methyl (meth) acrylate, butyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate.

Content of vinyl acetate component or (meth)
When the content of the acrylic ester component is too large, the transparency of the obtained interlayer film is improved, but the tensile strength is decreased, and conversely, the content of the vinyl acetate component or the content of the (meth) acrylic ester component is decreased. If the amount is too small, the tensile strength of the resulting interlayer film will be sufficient, but the transparency will decrease.

Examples of the dibenzylidene sorbitol compound used in the present invention include dibenzylidene sorbitol, bis (methylbenzylidene) sorbitol, bis (ethylbenzylidene) sorbitol, bis (propylbenzylidene) sorbitol, bis (butylbenzylidene) sorbitol, bis (pentylbenzylidene). ) Sorbitol,
Examples thereof include bis (hexylbenzylidene) sorbitol and bis (chlorobenzylidene) sorbitol.

The above-mentioned dibenzylidene sorbitol compound is finally blended in the range of 0.01 to 4 parts by weight with respect to 100 parts by weight of the ethylene-vinyl acetate copolymer or the ethylene- (meth) acrylic acid ester copolymer. Is preferred. If the amount of the dibenzylidene sorbitol compound is too small, the transparency of the obtained interlayer film or laminated glass does not improve, and conversely, if the amount of the dibenzylidene sorbitol compound is too large, the fluidity and tensile strength of the resulting interlayer film are reduced. Strength is reduced.

Among the silane coupling agents used in the present invention, as the silane coupling agent having an amino group,
3-aminopropyldimethylethoxysilane, 3-aminopropylmethyldiethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane and the like can be mentioned.

Examples of the silane coupling agent having a glycidyl group include 3-glycidoxypropyldimethylethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltrimethoxysilane and the like. .

Examples of the silane coupling agent having a mercapto group include mercaptomethyldimethylethoxysilane, mercaptomethylmethyldiethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane and 3-mercaptomethyldimethoxysilane.
Examples thereof include mercaptopropyltriethoxysilane.

The above silane coupling agents may be used alone or in combination of two or more kinds.
These silane coupling agents are finally added in an amount of 0.01 to 100 parts by weight of an ethylene-vinyl acetate copolymer or an ethylene- (meth) acrylic acid ester copolymer.
It is preferably blended in the range of 4 parts by weight.

If the amount of the silane coupling agent is too small, the adhesion between the glass plate and the intermediate film will not be improved, and if the amount of the silane coupling agent is too small, the resulting intermediate film or laminated glass will be obtained. Transparency is reduced.

The present invention will be described in detail below. In the resin kneading method of the present invention, as shown in FIG. 1, first, a part of a necessary amount of an ethylene-based copolymer which is an ethylene-vinyl acetate copolymer or an ethylene- (meth) acrylic acid ester copolymer is added to the copolymer. While supplying from the polymer feeder 4 to the hopper (raw material supply section) 3 of the twin-screw extruder 1, the dibenzylidene sorbitol compound is supplied from the compound feeder 2 to the hopper 3 or a supply section provided after the hopper 3. It is supplied and kneaded by the extruder 1. Further, it is cooled in a water tank 7 through a pellet mold 5 to obtain a high-concentration masterbatch A of the dibenzylidene sorbitol compound pelletized by a soft pelletizer 8. The extruder 1 may be a single-screw or a multi-screw having two or more screws, but in order to perform sufficient kneading, 2
A shaft or more is preferable.

The dibenzylidene sorbitol compound added to secure the transparency of the resin film is a twin screw extruder 1.
By kneading and melting between the screw and cylinder, it is finely and homogeneously dispersed in the resin, and serves as a nucleating agent for keeping the crystal unit of the resin at the wavelength of visible light or less. This time,
If the temperature of the extruded resin is lower than 150 ° C, the dibenzylidene sorbitol compound will be insufficiently melted and dispersed. Therefore, in order to develop the transparency function provided by the dibenzylidene sorbitol compound and to perform sufficient kneading,
The extruded resin temperature is 150 ° C. or higher. In particular, when the ethylene-based copolymer is an ethylene- (meth) acrylic acid ester copolymer, the extrusion resin temperature is 150 to 280.
℃

Next, as shown in FIG. 2, a part of the required amount of the ethylene copolymer is supplied from the copolymer feeder 4 to the hopper (raw material supply section) 3 of the single-screw extruder 9. At the same time, the silane coupling agent is supplied from the additive feeder 10 from the hopper 3 or a supply unit provided at a position after the hopper 3 and kneaded by the extruder 9.
Further, in the same manner as in the above step, it is cooled in the water tank 7 through the pellet mold 5 to obtain the high concentration masterbatch B of the silane coupling agent pelletized by the soft pelletizer 8.
In addition, the extruder 9 may be a single screw or a multi-screw having two or more screws as in the above.

The silane coupling agent added for the purpose of ensuring the adhesiveness between the glass plate and the resin film is an amino group,
It has one or more groups selected from the group consisting of a glycidyl group and a mercapto group. Since it has poor thermal stability and reacts sensitively to the temperature of the extruded resin, it is necessary to regulate the heat generation due to excessive kneading. Above 150 ° C,
Yellowing occurs in the silane coupling agent. Therefore, the function of adhesiveness provided by the silane coupling agent is expressed,
In addition, the temperature of the extruded resin is 150 in order to perform sufficient kneading.
It is below ℃. In particular, when the ethylene-based copolymer is an ethylene- (meth) acrylic acid ester copolymer, the extrusion resin temperature is 70 to 150 ° C.

The thus obtained master batches A and B and the remaining ethylene copolymer (ethylene-vinyl acetate copolymer or ethylene- (meth) acrylic acid ester copolymer) satisfying the required amount are kneaded. Then, the desired resin sheet is molded by a pressing method, an extrusion method, or the like.

For example, as shown in FIG. 3, when a resin film is formed by an extrusion method, a high concentration masterbatch A of the dibenzylidene sorbitol compound obtained in the above step, a high concentration masterbatch B of the silane coupling agent, and The remaining ethylene-based copolymer satisfying the amount is supplied from each of the feeders 11, 12 and 4 to the hopper (raw material supply section) 3 and kneaded by the single-screw extruder 9. Next, the sheet mold 15 is used to form a sheet, and the embossing roll 13 imparts embossing, and the sheet guide roll 14
And then cooled and solidified to obtain the desired resin sheet.

The temperature of the extruded resin at the time of molding the resin film at this time is not particularly limited, but is preferably 130 ° C. or lower in order to prevent unnecessary decomposition of the silane coupling agent. The extruder 9 may be a single-screw extruder or a multi-screw extruder having two or more screws in the same manner as described above, but in this case, it is possible to avoid unnecessary kneading and heat generation. A twin screw extruder is preferred.

If desired, known additives such as heat stabilizers, antioxidants, and ultraviolet absorbers may be added to the resin sheet. Examples of the heat stabilizer include calcium stearate, dialkanol aliphatic tertiary amine and the like. Examples of the antioxidant include t-butylhydroxytoluene (BHT) and “Irganox 1010” manufactured by Ciba-Geigy.

Examples of the ultraviolet absorber include benzotriazole-based and hindered amine-based ultraviolet absorbers. Examples of the benzotriazole-based ultraviolet absorber include "Tinuvin P", "Tinuvin 320" and "Tinuvin 3" manufactured by Ciba-Geigy.
26 "," Tinuvin 328 "and the like, and as the hindered amine type," LA-5 "manufactured by ADEKA ARGUS CORPORATION.
7 ”and the like.

A resin sheet obtained by the resin kneading method of the present invention
Is mainly used as an intermediate film for laminated glass, and when used as an intermediate film for laminated glass, the thickness thereof is preferably in the range of 0.05 to 1 mm. If the thickness of the intermediate film is too thin, the impact resistance, that is, the shock absorption property is lowered, and conversely, if the thickness of the intermediate film is too thick, the transparency is lowered.

To produce a laminated glass by using such an interlayer film for laminated glass, generally, a transparent inorganic glass plate such as a float glass or a transparent organic glass plate such as polycarbonate or polymethylmethacrylate is used.
After sandwiching the interlayer film for laminated glass, the laminated body was placed in a rubber bag, deaerated at a vacuum degree of about 20 torr or less for a certain period of time, and then transferred to an oven at about 80 ° C. or more in a deaerated state at a constant temperature. A method of adhering the glass plate and the intermediate film by holding for a time is adopted.

Further, after passing the laminated body through a pressure rubber roll at about 100 ° C. for a certain period of time, it is transferred to an oven at about 80 ° C. or more and kept at this temperature for a certain period of time to bond the glass plate and the interlayer film. The method of making it possible can also be adopted.

Incidentally, between the interlayer films for laminated glass,
It is also possible to produce a laminated glass by using a film or a sheet such as a polyester film, paper, a metal sheet or the like on which various patterns are printed to form a multilayered interlayer film or a decorative interlayer film, and using this.

[0031]

According to the resin kneading method of the present invention, an additive having contradictory extruded resin temperature conditions, that is, a dibenzylidene sorbitol compound, a glass plate and a resin film, which are added for the purpose of ensuring the transparency of the resin film, The silane coupling agent added for the purpose of securing the adhesiveness of the, under the extrusion resin temperature conditions according to each additive, after obtaining each high-concentration master batch by a separate step, each obtained Since the high-concentration masterbatch is kneaded to form the sheet, the desired function of each additive can be sufficiently expressed without impairing the desired function, and a resin film having these functions sufficiently can be obtained. The obtained resin film is mainly suitable for use as an intermediate film for laminated glass.

[0032]

EXAMPLES Examples and comparative examples of the present invention will be given below.
The present invention will be specifically described below. Example 1 Dibenzylidene sorbitol compound high concentration masterbatch
Manufacture of Chi A Using the method and apparatus shown in FIG.
A high concentration masterbatch A was extruded. In addition, use
The conditions of the extruder and the temperature of the extruded resin are as follows. (Blending) 100 parts by weight of ethylene-vinyl acetate copolymer (Evatate 5011 manufactured by Sumitomo Chemical Co., Ltd.) 6 parts by weight of benzylidene sorbitol compound (Gelol D manufactured by Shin Nippon Rika Co., Ltd.) Extruded resin temperature: 200 ° C

Silane coupling agent high concentration master bath
Production of Chi B Using the method and apparatus shown in FIG.
High concentration masterbatch B was extruded. The conditions of the extruder used and the temperature of the extruded resin are as follows. (Compounding) Ethylene-vinyl acetate copolymer 100 parts by weight (Evatate 5011 manufactured by Sumitomo Chemical Co., Ltd.) Silane coupling agent (3-aminopropyltri 1 part by weight ethoxysilane) (Conditions) Extruder: 40 mmΦ twin screw extruder Extruded resin temperature: 120 ° C

Production of Intermediate Film Using the method and apparatus shown in FIG.
The interlayer film sheet was extruded. The conditions of the extruder used and the temperature of the extruded resin are as follows. (Blending) Ethylene-vinyl acetate copolymer 100 parts by weight (Evatate 5011 manufactured by Sumitomo Chemical Co., Ltd.) 5.89 parts by weight of the above masterbatch A 5.61 parts by weight of the above masterbatch B (conditions) Extruder: 130 mmΦ single screw Extruder Extruded resin temperature: 120 ° C

Example 2 Extruded resin temperature of masterbatch A in Example 1 20
0 ° C to 150 ° C, masterbatch B extruded resin temperature 12
An interlayer film sheet was extrusion-molded in the same manner as in Example 1 except that 0 ° C was changed to 90 ° C.

Example 3 Dibenzylidene sorbitol compound high concentration master bath
Production of Chi A Using the method and apparatus shown in FIG.
A high concentration masterbatch A was extruded. The conditions of the extruder used and the temperature of the extruded resin are as follows. (Compounding) Ethylene- (meth) acrylic acid ester copolymer 100 parts by weight (Aklift WH202 manufactured by Sumitomo Chemical Co., Ltd.) 6 parts by weight of benzylidene sorbitol compound (Gelol D manufactured by Shin Nippon Rika Co., Ltd.) (Conditions) Extruder: 45 mmΦ2 Axial screw extruder Extruded resin temperature: 200 ° C

Silane coupling agent high concentration master bath
Production of Chi B Using the method and apparatus shown in FIG.
High concentration masterbatch B was extruded. The conditions of the extruder used and the temperature of the extruded resin are as follows. (Compounding) Ethylene- (meth) acrylic acid ester copolymer 100 parts by weight (Sumitomo Chemical's Acryft WH202) Silane coupling agent (3-aminopropyltri 1 part by weight ethoxysilane) (Conditions) Extruder: 40 mmΦ Axial screw extruder Extruded resin temperature: 120 ° C

Production of Intermediate Film Using the method and apparatus shown in FIG.
The interlayer film sheet was extruded. The conditions of the extruder used and the temperature of the extruded resin are as follows. (Blending) 100 parts by weight of ethylene- (meth) acrylic acid ester copolymer (Acryft WH202 manufactured by Sumitomo Chemical Co., Ltd.) 5.89 parts by weight of the above masterbatch 5.61 parts by weight of the above masterbatch B (conditions) Extruder: 130mmΦ single screw extruder Extruded resin temperature: 120 ℃

Example 4 Extruded resin temperature of masterbatch A in Example 3 20
0 ° C to 150 ° C, masterbatch B extruded resin temperature 12
An interlayer film sheet was extrusion-molded in the same manner as in Example 3 except that 0 ° C was changed to 90 ° C.

Comparative Example 1 Using the method and apparatus shown in FIG.
The interlayer film sheet was extruded. The conditions of the extruder used and the temperature of the extruded resin are as follows. (Compounding) Ethylene-vinyl acetate copolymer 100 parts by weight (Evatate 5011 manufactured by Sumitomo Chemical Co., Ltd.) Dibenzylidene sorbitol 0.3 parts by weight (Gelol D manufactured by Shin Nippon Rika Co.) Silane coupling agent (3-aminopropyltri) 0.05 parts by weight ethoxysilane) (Conditions) Extruder: 45 mmΦ twin screw extruder Extruded resin temperature: 200 ° C

Comparative Example 2 An interlayer film sheet was extrusion-molded in the same manner as in Comparative Example 1 except that the extruded resin temperature of 200 ° C. in Comparative Example 1 was changed to 120 ° C.

Comparative Example 3 Using the method and apparatus shown in FIG.
The interlayer film sheet was extruded. The conditions of the extruder used and the temperature of the extruded resin are as follows. (Compounding) Same as Comparative Example 1 (Conditions) Extruder: 40 mmΦ single screw extruder Extruded resin temperature: 200 ° C

Comparative Example 4 An interlayer film sheet was extrusion-molded in the same manner as Comparative Example 3 except that the extruded resin temperature of 200 ° C. in Comparative Example 3 was changed to 120 ° C.

Comparative Example 5 Extrusion resin temperature of masterbatch A in Example 1 20
0 ° C to 120 ° C, masterbatch B extruded resin temperature 12
An interlayer film sheet was extrusion-molded in the same manner as in Example 1 except that 0 ° C was changed to 140 ° C.

Comparative Example 6 Extrusion resin temperature of masterbatch A in Example 1 20
Masterbatch B extruded resin temperature of 120 ° C at 0 ° C
The interlayer sheet was extruded in the same manner as in Example 1 except that the temperature was set to 160 ° C.

Comparative Example 7 The same as Comparative Example 1 except that an ethylene- (meth) acrylic acid ester copolymer (Aklift WH202 manufactured by Sumitomo Chemical Co., Ltd.) was used instead of the ethylene-vinyl acetate copolymer in Comparative Example 1. Then, the interlayer film sheet was extruded.

Comparative Example 8 The same as Comparative Example 2 except that an ethylene- (meth) acrylic acid ester copolymer (Aklift WH202 manufactured by Sumitomo Chemical Co., Ltd.) was used in place of the ethylene-vinyl acetate copolymer in Comparative Example 2. Then, the interlayer film sheet was extruded.

Comparative Example 9 The same as Comparative Example 3 except that an ethylene- (meth) acrylic acid ester copolymer (Aklift WH202 manufactured by Sumitomo Chemical Co., Ltd.) was used instead of the ethylene-vinyl acetate copolymer in Comparative Example 3. Then, the interlayer film sheet was extruded.

Comparative Example 10 The same as Comparative Example 4 except that an ethylene- (meth) acrylic acid ester copolymer (Aklift WH202 manufactured by Sumitomo Chemical Co., Ltd.) was used in place of the ethylene-vinyl acetate copolymer in Comparative Example 4. Then, the interlayer film sheet was extruded.

Comparative Example 11 The same as Comparative Example 5 except that an ethylene- (meth) acrylic acid ester copolymer (Aklift WH202 manufactured by Sumitomo Chemical Co., Ltd.) was used instead of the ethylene-vinyl acetate copolymer in Comparative Example 5. Then, the interlayer film sheet was extruded.

Comparative Example 12 The same as Comparative Example 6 except that an ethylene- (meth) acrylic acid ester copolymer (Aklift WH202 manufactured by Sumitomo Chemical Co., Ltd.) was used in place of the ethylene-vinyl acetate copolymer in Comparative Example 6. Then, the interlayer film sheet was extruded.

Using the interlayer sheets obtained in Examples 1 to 4 and Comparative Examples 1 to 12, laminated glass was manufactured by the following method, and the transparency and the degree of coloring were evaluated.
The results are summarized in Table 1. By evaluating the transparency and the degree of coloring of the laminated glass, the transparency and the degree of coloring of the interlayer film can be evaluated at the same time. In Table 1,
As the type of resin, C represents an ethylene-vinyl acetate copolymer, and D represents an ethylene- (meth) acrylic acid ester copolymer.

Manufacture of Laminated Glass Each of the above-mentioned interlayer films (film thickness is 0.4 mm)
Transparent float glass with a thickness of 3 mm (length 80 mm x width 80 mm)
Sandwiched between them and put this laminate in a rubber bag for 10 to
After degassing for 20 minutes at a vacuum degree of rr, the rubber bag containing the laminated body was transferred to an oven while keeping the degassed state, and 1
The glass plate and the interlayer film were adhered by holding at 00 ° C. for 30 minutes, then cooled to room temperature and the deaerated state was released to obtain a laminated glass.

The transparency has a haze value (JIS K71
(Measured based on No. 05), the lower the value, the higher the transparency, and when a laminated glass is used, a haze value of 2 or less is generally considered good. The degree of coloring is indicated by yellowness (yellow index value) (measured in accordance with JIS K7105), and the lower the value, the lower the degree of decomposition coloring. A value of 4 or less is considered good.

[0055]

[Table 1]

[0056]

As described above, according to the resin kneading method of the present invention, an additive having contradictory extruded resin temperature conditions, that is, a dibenzylidene sorbitol compound added for the purpose of ensuring the transparency of the resin film, After obtaining each high-concentration masterbatch by a separate step, with a silane coupling agent added for the purpose of ensuring the adhesiveness between the glass plate and the resin film, under the extrusion resin temperature conditions suitable for each additive. Further, since each of the obtained high-concentration master batches is kneaded to form a sheet, the desired function of each additive can be sufficiently expressed without impairing the intended function.

Therefore, it is possible to form a resin film having satisfactory transparency and adhesiveness and no coloring of the adhesive additive. This resin film is mainly suitable for use as an intermediate film for laminated glass, but it is also used as a resin film for transparent laminated materials such as transparent wall materials and transparent plate materials.

When a laminated glass is produced using the interlayer film for laminated glass of the present invention, a laminated glass having particularly good transparency (haze value of 2 or less) and low yellowness (yellow index value of 4 or less) is obtained. Moreover, since the laminated glass can be easily obtained without the need for an expensive autoclave, the manufacturing cost of the laminated glass can be reduced. Furthermore, since it is possible to carry out a bonding process at a relatively low temperature, for example, 100 ° C., not only an inorganic glass plate but also an organic glass plate such as polycarbonate or polymethylmethacrylate can be used as a glass plate without being thermally deformed. When producing a decorative laminated glass, it is not necessary to use a heat-resistant dye in the printing ink, and the cost is reduced.

Therefore, the laminated glass using the interlayer film for laminated glass of the present invention is suitable for use in vehicle window glasses, building window glasses, glazing materials for exercise facilities and public facilities, partitions, and security doors. be able to.

[Brief description of drawings]

FIG. 1 is a schematic diagram of production of a high concentration masterbatch A of dibenzylidene sorbitol compound.

[Fig. 2] High concentration masterbatch B of silane coupling agent
Manufacturing schematic diagram of.

FIG. 3 is a schematic view of an interlayer film forming method according to the present invention.

FIG. 4 is a schematic view of a conventional method for forming an interlayer film sheet.

[Explanation of symbols]

1 Twin screw extruder 2 Feeder for dibenzylidene sorbitol compound 3 Hopper 4 Ethylene-vinyl acetate copolymer or ethylene-
Feeder for (meth) acrylic acid ester copolymer 5 Pellet mold 6 Pellet guide roll 7 Water tank 8 Soft pelletizer 9 Single screw extruder 10 Silane coupling agent feeder 11 Master batch A feeder 12 Master batch B feeder 13 Embossing roll 14 Sheet guide roll 15 Sheet mold

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C08L 23/08 LDF

Claims (4)

[Claims] 1. A resin kneading method in which an ethylene-vinyl acetate copolymer is kneaded with a dibenzylidene sorbitol compound and a silane coupling agent having at least one group selected from the group consisting of an amino group, a glycidyl group and a mercapto group. A method, which comprises kneading the ethylene-vinyl acetate copolymer and the dibenzylidene sorbitol compound at an extrusion resin temperature of 150 ° C. or higher to obtain a high-concentration masterbatch of the dibenzylidene sorbitol compound, and the ethylene-vinyl acetate A step of kneading the copolymer and the silane coupling agent at an extrusion resin temperature of 150 ° C. or lower to obtain a high-concentration masterbatch of the silane coupling agent, and further, both masterbatches obtained in each of the steps and the ethylene. A resin comprising a step of kneading with a vinyl acetate copolymer Kneading method. 2. An ethylene- (meth) acrylic acid ester copolymer is kneaded with a dibenzylidene sorbitol compound and a silane coupling agent having at least one group selected from the group consisting of an amino group, a glycidyl group and a mercapto group. A resin kneading method for producing an ethylene- (meth) acrylic acid ester copolymer and the dibenzylidene sorbitol compound described above at an extrusion resin temperature of 150 to 280 ° C.
Kneading with, to obtain a high-concentration masterbatch of the dibenzylidene sorbitol compound, and the above ethylene (meta)
Acrylic ester copolymer and the above silane coupling agent are kneaded at an extrusion resin temperature of 70 to 150 ° C. to obtain a high-concentration master batch of the silane coupling agent, and both masters obtained in each of the above steps. And a step of kneading the batch and the ethylene- (meth) acrylic acid ester copolymer. 3. An interlayer film for laminated glass, which is obtained by the resin kneading method according to claim 1. 4. A laminated glass using the interlayer film for laminated glass according to claim 3.