JPH0812383A - Intermediate film for laminated glass - Google Patents

Abstract

PURPOSE:To obtain an intermediate film for laminated glass free from the self-sticking property and hygroscopicity of a film and the bleed of a plasticizer, excellent in heat resistance and humidity resistance, capable of laminating at a relatively low temp. without the need of humidity conditioning and the use of an expensive autoclave and having excellent adhesivity and transparency. CONSTITUTION:This intermediate film is composed of 0.01-4 pts.wt. silane coupling agent 100 pts.wt. modified resin, which is obtained by partially esterifying a partial saponified material of an ethylene-vinyl acetate copolymer with a discarboxylic anhydride and contains 0.5-35wt.% vinyl acetate component, 4- -18wt.% vinyl alcohol component and 6-60wt.% partially esterified component of vinyl alcohol with a dicarboxylic acid. As the silane coupling agent, a compound having amino group (organic functional group) and alkoxyl group (hydrolyzing group) is suitably used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interlayer film for laminated glass containing a modified resin obtained by modifying an ethylene-vinyl acetate copolymer as a main component.

[0002]

2. Description of the Related Art As an interlayer film for laminated glass, a polyvinyl butyral interlayer film containing a plasticizer is widely used.

This type of polyvinyl butyral interlayer film is
It is tough and has excellent transparency and adhesiveness to glass, but in particular, the film has self-adhesiveness and hygroscopicity, and the plasticizer is easy to bleed, and the process is performed under high temperature and high pressure using an expensive autoclave. Need to do.

As an intermediate film which has improved the above drawbacks, Japanese Patent Publication No. 47-2103 discloses an intermediate film comprising a modified resin of a specific component obtained by partially esterifying a partially saponified ethylene-vinyl acetate copolymer with phthalic anhydride. Membranes have been proposed.

Further, Japanese Patent Publication No. 2-53381 discloses that
A thermally crosslinkable intermediate film has been proposed which comprises an ethylene-vinyl acetate copolymer mixed with an organic peroxide and a silane coupling agent.

[0006]

The interlayer film made of the above-mentioned modified resin and the thermally crosslinkable interlayer film can be processed together by using a press machine or a pressure bonding roll in addition to an expensive autoclave. The adhesiveness is insufficient, and the heat resistance and moisture resistance are not sufficiently satisfactory.

[0007] Usually, in order to obtain a laminated glass with good performance, the laminating process is performed at a relatively high temperature (about 130 ° C or higher). Sex deteriorates.

When an organic glass plate such as polycarbonate or polymethylmethacrylate is used as the glass plate, the organic glass plate is thermally deformed when heated and pressed at such a high temperature, and therefore the glass plate is limited to the inorganic glass plate. .

Further, in the case of producing a decorative laminated glass using the above intermediate film, a polyester film or the like having a decorative pattern printed thereon is interposed between the intermediate films, but the printing ink of this film requires a heat resistant dye. , Costly.

The present invention has been made in view of the drawbacks of the above-mentioned conventional intermediate film, and an object thereof is to eliminate the self-adhesiveness of the film, the hygroscopicity, and the bleeding of the plasticizer.
Laminated glass that has excellent heat resistance and humidity resistance, does not require humidity control, can be laminated at a relatively low temperature without using an expensive autoclave, and has good adhesion to glass plates and transparency. To provide an intermediate film for use.

[0011]

Means for Solving the Problems The above-mentioned object is ethylene-
Obtained by partially esterifying a partially saponified product of a vinyl acetate copolymer with a dicarboxylic acid anhydride, vinyl acetate component 0.5 to 35% by weight, vinyl alcohol component 4 to 18% by weight, vinyl alcohol dicarboxylic acid partial ester component This can be achieved by an interlayer film for laminated glass, which comprises 100 parts by weight of a modified resin of 6 to 60% by weight and 0.01 to 4 parts by weight of a silane coupling agent.

The partially saponified ethylene-vinyl acetate copolymer used in the present invention is obtained by partially hydrolyzing the ethylene-vinyl acetate copolymer. The partial hydrolysis is carried out, for example, by causing a reaction in methanol using an acid or a base as a catalyst to hydrolyze, and leaving a part of the vinyl acetate component.

As the ethylene-vinyl acetate copolymer, it is appropriate to use one having a vinyl acetate content of 5 to 50% by weight and a melt index (MI) of 1 to 200.

If the vinyl acetate content is too high, the transparency of the resulting interlayer film will improve, but the tensile properties will decrease, and conversely if the vinyl acetate content is too low, the tensile properties of the resulting interlayer film will be poor. Sufficient, but transparency decreases.

If the melt index is too low, the fluidity of the resulting intermediate film is lowered, making film formation difficult, and conversely,
If the melt index is too high, the workability of the resulting interlayer film deteriorates.

In the present invention, the partially saponified product of the ethylene-vinyl acetate copolymer is partially esterified with a dicarboxylic acid anhydride. The partial esterification is carried out, for example, by mixing the partially saponified product and the dicarboxylic acid anhydride with a solvent such as toluene or xylene and heating the mixture.

As the dicarboxylic acid anhydride, maleic anhydride, succinic anhydride, phthalic anhydride, hexahydrophthalic anhydride and the like are used. These may be used alone or in combination of two or more kinds. Good. Most of these dicarboxylic acid anhydrides are bound to the partially saponified product while leaving one carboxyl group. Thus, the modified resin is obtained.

In the present invention, in the above modified resin, a vinyl acetate component of 0.5 to 35% by weight, a vinyl alcohol component of 4 to 18% by weight, and a dicarboxylic acid partial ester component of vinyl alcohol of 5 to 60% by weight are used. To do.

When the vinyl acetate component decreases, the transparency and fluidity of the resulting interlayer film deteriorates. On the contrary, when the vinyl acetate component increases, the adhesive property and tensile properties of the resulting interlayer film decrease. Ingredients are limited to 0.5-35% by weight.

When the vinyl alcohol component is low, the adhesiveness and tensile properties of the resulting interlayer film are low, and when the vinyl alcohol component is high, the water resistance is low. Therefore, the vinyl alcohol component is 4 to 18% by weight. Limited.

When the dicarboxylic acid partial ester component of vinyl alcohol decreases, the transparency of the resulting interlayer film decreases, and conversely, when the dicarboxylic acid partial ester component of vinyl alcohol increases, the tensile properties decrease, so that the vinyl alcohol Dicarboxylic acid partial ester component is 5-6
Limited to 0% by weight.

The modified resin preferably has a melt index (MI) of 2 to 50. If the melt index is too low, the fluidity of the resulting interlayer film will be reduced, making film formation difficult, while if the melt index is too high, the processability of the resulting interlayer film will be poor and the viscosity will be reduced. Then, the adhesiveness with the glass decreases.
Here, the melt index of the modified resin is JIS K
According to 7210, temperature 190 ℃, load 2.16 kg
It is the value measured under the condition of f.

In the present invention, a silane coupling agent is added to the modified resin. This silane coupling agent is for improving the adhesion between the interlayer film and the glass, and any known silane coupling agent can be used.

Examples of such a silane coupling agent include 3-aminopropyldimethylethoxysilane, 3-aminopropylmethyldiethoxysilane, and 3-aminopropylmethyldiethoxysilane.
Aminopropylmethyldibutoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N- (2-aminoethyl) -3 -Aminopropylhexyldimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminomethyl) -3-aminopropyltrimethoxysilane and other amino groups (organic functional groups) And compounds having an alkoxy group (hydrolyzable group).

In addition, vinyltriethoxysilane, 3-
Methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 2- (3,4-
Epoxycyclohexyl) ethyltrimethoxysilane,
Vinyl such as 3-mercaptopropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, and 3-chloropropyltriethoxysilane, methacryl group, mercapto group, chlorine (all are organic functional groups) And compounds having an alkoxy group (hydrolyzable group).

If the compounding amount of these silane coupling agents is small, the adhesiveness of the obtained intermediate film is not improved, and conversely, if the compounding amount of the silane coupling agent is large, the transparency of the obtained intermediate film is high. descend. Therefore, the compounding amount of the silane coupling agent is limited to 0.01 to 4 parts by weight with respect to 100 parts by weight of the modified resin.

In particular, the compounds represented by the following general formula (I) are suitable because they are effective in a small amount.

[0028]

[Chemical 4] (In the formula, R is a hydrocarbon group substituted with at least one amino group, X ^{1 to} X ³ are at least one alkoxy group, and the other are alkyl groups.)

Examples of such silane coupling agents include 3-aminopropyldimethylethoxysilane, 3-aminopropylmethyldiethoxysilane, and 3-aminopropylmethyldiethoxysilane.
Aminopropylmethyldibutoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N- (2-aminoethyl) -3 -Aminopropylhexyldimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminomethyl) -3-aminopropyltrimethoxysilane and the like can be mentioned.

Among them, the compound represented by the general formula (II) is suitable because the effect is large even in a small amount.

[0031]

[Chemical 5](In the formula, R is a carbon substituted with at least one amino group.
Hydrogenated group, X^Four~ X ⁶At least one has 1 to 1 carbon atoms
6 is an alkoxy group, the other is an alkyl group having 1 to 6 carbon atoms.
You. )

Examples of such silane coupling agents include 3-aminopropylmethyldiethoxysilane, 3-aminopropylmethyldibutoxysilane, N-
Examples include (2-aminoethyl) -3-aminopropylmethyldimethoxysilane and N- (2-aminoethyl) -3-aminopropylhexyldimethoxysilane.

Among them, the compound represented by the general formula (III), that is, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, is most suitable because the effect is large even in a small amount.

[0034]

[Chemical 6] (In the formula, R is an N- (2-aminoethyl) -3-aminopropyl group, X ^{7 to} X ⁹ are two methoxy groups, and the others are methyl groups.)

In the present invention, for the purpose of preventing the deterioration of the modified resin, known additives such as heat stabilizers, antioxidants and ultraviolet absorbers may be added, if necessary.

Examples of the heat stabilizers include calcium stearate, dialkanol, and aliphatic tertiary amines. Examples of the antioxidant include t-butylhydroxytoluene (BHT) and “Irganox 1010” manufactured by Ciba-Geigy.

Examples of the ultraviolet absorber include benzotriazole type and hindered amine type ultraviolet absorbers. As the benzotriazole type, for example,
"Cinunubin P" manufactured by Ciba Geigy, "Cinunubin 32"
0 "," Tinuvin 326 "," Tinuvin 328 "and the like, and examples of the hindered amine type include" LA-57 "manufactured by ADEKA ARGUS CORPORATION.

In order to obtain the interlayer film for laminated glass of the present invention, any conventionally known molding method is adopted. For example,
Examples thereof include a method of melt-kneading a mixture of the above modified resin and a silane coupling agent with an extruder and extruding it into a sheet, a method of melt-kneading with a roll to form a sheet. The thickness of the intermediate film is generally 0.3 to 1.5 mm, but is not limited to this.

To produce a laminated glass using the interlayer film for laminated glass of the present invention, generally, the interlayer film is provided between transparent inorganic glass plates such as float glass or transparent organic glass plates such as polycarbonate and polymethylmethacrylate. This sandwich was placed in a rubber bag, deaerated for a certain period of time at a vacuum degree of about 20 torr or less, and then transferred to an oven at a temperature of about 80 ° C. or more while being deaerated.
A method of adhering the glass plate and the intermediate film by holding the temperature for a certain period of time is adopted.

The above sandwich was placed at 100 ° C.
After passing through a pressure rubber roll for about a certain time, about 80
It is also possible to adopt a method in which the glass plate and the interlayer film are adhered by transferring the glass plate to an oven at a temperature of not less than 0 ° C. and holding at this temperature for a certain period of time.

Between the interlayer films for laminated glass,
A film or sheet such as polyester film, polyurethane film, paper, metal sheet, etc. on which various patterns are printed is interposed to form a multilayered interlayer film or a decorative interlayer film, and using this, for example, the following layer structure It is also possible to manufacture the laminated glass.

Inorganic glass / intermediate film / polyester film / intermediate film / inorganic glass inorganic glass / intermediate film / polyurethane film / intermediate film /
Inorganic glass Inorganic glass / Interlayer film / Metal sheet / Interlayer film / Inorganic glass Inorganic glass / Interlayer film / Paper / Interlayer film / Inorganic glass Polycarbonate plate / Interlayer film / Polyester film /
Intermediate film / Polycarbonate plate Acrylic plate / Intermediate film / Metal sheet / Intermediate film / Acrylic plate Acrylic plate / Intermediate film / Paper / Intermediate film / Acrylic plate

[0043]

A partially saponified ethylene-vinyl acetate copolymer is partially esterified with a dicarboxylic acid anhydride to obtain 0.5 to 35% by weight of vinyl acetate component, 4 to 18% by weight of vinyl alcohol component, and When a modified resin containing 6 to 60% by weight of the dicarboxylic acid partial ester component is used, an interlayer film having improved self-adhesiveness and hygroscopicity and good heat resistance and transparency can be obtained. Further, since no plasticizer is used, bleeding of the plasticizer does not occur. Moreover, it becomes possible to perform the matching process at a relatively low temperature.

When 100 to 4 parts by weight of the modified resin is mixed with 0.01 to 4 parts by weight of a silane coupling agent, the glass ( The adhesiveness between the organic or inorganic) and the interlayer film is improved. In particular, as a silane coupling agent,
A compound having an amino group (organic functional group) and an alkoxy group (hydrolyzable group) represented by the above general formulas (I), (II) and (III) is effective.

[0045]

EXAMPLES Examples and comparative examples of the present invention will be shown below. Example 1 Synthesis of Modified Resin An ethylene-vinyl acetate copolymer having a vinyl acetate content of 40% by weight (EVAFLEX 40Y.W: manufactured by Mitsui DuPont Polychemical Co., Ltd.) was hydrolyzed to give a partially saponified product having a saponification degree of 38 mol%. Obtained. 180 g of this partially saponified product and 50 g of phthalic anhydride were mixed in 40 cc of pyridine and 1.5 liter of xylene and reacted at 110 ° C. for 4 hours to obtain a modified resin.

The composition of the obtained modified resin was measured by infrared analysis and chemical analysis. As a result, 25% by weight of vinyl acetate component, 10% by weight of vinyl alcohol component, 10% by weight of phthalic acid partial ester component of vinyl alcohol, and the rest Was the ethylene component. Further, the melt index (MI) measured according to JIS K 7210 under the conditions of a temperature of 190 ° C. and a load of 2.16 kgf was 10.

Preparation of intermediate film 100 parts by weight of the above modified resin and 0.05 part by weight of N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane as a silane coupling agent were mixed, and this mixture was mixed with Laboplast. Supplied to a mill (manufactured by Toyo Seiki Co., Ltd.) 18
It is heated and melted at 0 ° C for 5 minutes at 60 revolutions / minute, sandwiched between polyester films, molded into a sheet with a press and allowed to stand at room temperature, then an interlayer film with a thickness of 400 μm protected by a polyester film is formed. It was made.

Preparation of laminated glass The polyester film of the above-mentioned intermediate film was peeled off, and the laminated polyester film was sandwiched between transparent float glass plates having a thickness of 3 mm which had been washed and dried in advance.
After degassing for 20 minutes at a vacuum degree of 0 torr, it was transferred to an oven at 100 ° C. in the degassed state and kept at this temperature for 30 minutes to bond the glass plate and the intermediate film to obtain a laminated glass.

Example 2 Instead of the transparent float glass plate having a thickness of 3 mm, a transparent polycarbonate plate having a thickness of 3 mm (Iupilon sheet NF200) was used.
U: manufactured by Mitsubishi Gas Chemical Co., Inc. was used. Otherwise, Example 1
I went the same way.

Example 3 As a silane coupling agent, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane.
N- (2-aminoethyl) -3-, instead of 05 parts by weight
0.3 parts by weight of aminopropyltrimethoxysilane was used. Also, instead of a transparent float glass plate with a thickness of 3 mm,
A transparent polymethylmethacrylate plate (Acrylite HR: manufactured by Mitsubishi Rayon Co., Ltd.) having a thickness of 3 mm was used. Other than that was performed like Example 1.

Example 4 As a silane coupling agent, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane.
Instead of 05 parts by weight, 0.1 parts by weight of 3-aminopropyltrimethoxysilane was used. Other than that was performed like Example 1.

Example 5 An ethylene-vinyl acetate copolymer (Ultracene 760, manufactured by Tosoh Corporation) having a vinyl acetate content of 43% by weight was hydrolyzed to obtain a partially saponified product having a saponification degree of 65 mol%. 180 g of this partially saponified product and 50 g of maleic anhydride were mixed in 40 cc of pyridine and 1.5 liter of xylene.
A modified resin was obtained by reacting at 0 ° C. for 4 hours.

The composition of the resulting modified resin was measured by infrared analysis and chemical analysis. As a result, 15% by weight of vinyl acetate component, 10% by weight of vinyl alcohol component, 25% by weight of maleic acid partial ester component of vinyl alcohol and the rest Was the ethylene component. Further, the melt index (MI) measured according to JIS K 7210 under the conditions of a temperature of 190 ° C. and a load of 2.16 kgf was 6.

Example 1 was repeated except that 100 parts by weight of the modified resin and 0.2 part by weight of 3-aminopropyltriethoxysilane were used as the silane coupling agent.

Example 6 The procedure of Example 1 was repeated except that 100 parts by weight of the modified resin used in Example 5 and 0.1 part by weight of 3-aminopropyltriethoxysilane were used as the silane coupling agent. .

Example 7 An ethylene-vinyl acetate copolymer having a vinyl acetate content of 43% by weight (Ultracene 760, manufactured by Tosoh Corporation) was hydrolyzed to obtain a partially saponified product having a saponification degree of 35 mol%. 180 g of this partially saponified product and 50 g of succinic anhydride were mixed with pyridine 40
cc and xylene mixed in 1.5 liters, 110 ℃
The reaction was carried out for 4 hours to obtain a modified resin.

The composition of the obtained modified resin was measured by infrared analysis and chemical analysis. As a result, 28% by weight of vinyl acetate component, 15% by weight of vinyl alcohol component, 25% by weight of succinic acid partial ester component of vinyl alcohol and the rest Was the ethylene component. Further, the melt index (MI) measured according to JIS K 7210 under the conditions of a temperature of 190 ° C. and a load of 2.16 kgf was 10.

Example 1 was repeated except that 100 parts by weight of this modified resin and 0.1 part by weight of 3-aminopropyltrimethoxysilane were used as a silane coupling agent.

Example 8 As a silane coupling agent, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane.
Instead of 05 parts by weight, 0.2 parts by weight of 3-mercaptopropyltrimethoxysilane was used. Other than that was performed like Example 1.

Example 9 As a silane coupling agent, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane.
Instead of 05 parts by weight, 0.2 parts by weight of 3-glycidoxypropyltrimethoxysilane was used. Other than that was performed like Example 1.

Comparative Example 1 No silane coupling agent was added. Other than that was performed like Example 1.

Comparative Example 2 As a silane coupling agent, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane.
05 parts by weight was changed to 5 parts by weight. Otherwise, Example 1
I went the same way.

Comparative Example 3 Example 1 was repeated except that 100 parts by weight of the modified resin used in Example 7 and 0.005 parts by weight of 3-aminopropyltrimethoxysilane were used as the silane coupling agent. .

Comparative Example 4 Example 1 was repeated except that 100 parts by weight of the modified resin used in Example 7 and 5 parts by weight of 3-aminopropyltrimethoxysilane were used as the silane coupling agent.

Comparative Example 5 Preparation of interlayer film Melt index (MI) 2, vinyl acetate content 20
Wt% ethylene-vinyl acetate copolymer (EVAFLE
X360: 100 parts by weight of DuPont Mitsui Polychemical Co., Ltd. and 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane as an organic peroxide (Perhexa 3M: NOF Corporation) 1 Parts by weight, 3 parts by weight of triallyl isocyanurate (Tyke: manufactured by Nippon Kasei Co., Ltd.) as a crosslinking aid, and 3- as a silane coupling agent.
0.3 parts by weight of methacryloxypropyltrimethoxysilane was mixed, and this mixture was kneaded by a roll mill heated to 100 ° C. to prepare an interlayer film having a thickness of 400 μm.

Preparation of Laminated Glass The above interlayer film was sandwiched between transparent float glass plates having a thickness of 3 mm,
Put this sandwich in a rubber bag, 10 torr
After degassing for 20 minutes at a vacuum degree of
The glass plate and the interlayer film were adhered to each other by transferring them to an oven at ℃ for 30 minutes, and a laminated glass was obtained.

With respect to the laminated glass of Examples 1 to 9 and Comparative Examples 1 to 5 thus obtained, a transparency test, an adhesion test, an impact resistance test, a cold heat test, a humidity resistance test and a boiling test were carried out by the following methods. went. The results are summarized in Tables 1 to 3
Shown in

(1) Transparency test For laminated glass, an integral turbidimeter (manufactured by Tokyo Denshoku Co., Ltd.)
Was used to measure the total light transmittance (%) and haze (%) at a temperature of 23 ° C. and a relative humidity of 50%.

(2) Adhesion test A transparent float glass plate, a transparent polycarbonate plate or a transparent polymethylmethacrylate plate was laminated on one side with the interlayer film of each of the above-mentioned Examples and Comparative Examples, and a polyester film was laminated on it. The laminated glass was adhered under the same conditions as those of the laminated glass of Examples and Comparative Examples, and then cut to a width of 2 cm and a length of 10 cm to obtain a sample.

The polyester film of this sample was peeled off, and Tensilon UCE500 (manufactured by Orientec Co., Ltd.) was used to peel the interlayer film at 90 ° at a pulling speed of 500 mm / min, and the peeling strength (kg / cm) was measured.

(3) Impact resistance test In accordance with JIS R3205, a laminated glass held at a temperature of 23 ° C. and a relative humidity of 50% for 4 hours was horizontally held on a supporting frame, and a lead shot was filled therein with a weight of 45 kg. 30 attackers
A shot bag test was conducted by free fall from a height of cm in a pendulum manner. The case where an opening through which a ball having a diameter of 75 mm can freely pass was formed at the broken portion, and the case where it did not occur was marked as ◯.

(4) Cold Heat Test After allowing the laminated glass to stand at 70 ° C. for 2 hours, it was cooled from 70 ° C. to −20 ° C. over 2 hours, and further at −20 ° C. for 2 hours.
After leaving it for an hour, it is heated from −20 ° C. to 70 ° C. for 2 hours. This was set as one cycle, and after a total of 10 cycles of tests, the presence or absence of layer delamination was observed. The case where there was no layer peeling was marked with ◯, and the case where there was layer peeling was marked with x.

(5) Humidity resistance test A laminated glass was allowed to stand at a temperature of 55 ° C. and a relative humidity of 98% for 2 weeks, and then the presence or absence of layer delamination was observed. The case where there was no layer peeling was marked with ◯, and the case where there was layer peeling was marked with x.

(6) Boiling test After the laminated glass was left in boiling water for 2 hours, the presence or absence of layer delamination was observed. The case where there was no layer peeling was marked with ◯, and the case where there was layer peeling was marked with x.

[0075]

[Table 1]

[0076]

[Table 2]

[0077]

[Table 3]

[0078]

As described above, the interlayer film for laminated glass of the present invention is obtained by partially esterifying a partially saponified ethylene-vinyl acetate copolymer with a dicarboxylic acid anhydride. Modified resin 100 of 35% by weight, vinyl alcohol component 4 to 18% by weight, dicarboxylic acid partial ester component of vinyl alcohol 6 to 60% by weight
It is composed of 1 part by weight and 0.01 to 4 parts by weight of a silane coupling agent, so that it has excellent self-adhesiveness, hygroscopicity and bleeding of plasticizer, excellent heat resistance and moisture resistance, and requires humidity control. Therefore, it is possible to obtain an interlayer film for laminated glass which can be laminated at a relatively low temperature without using an expensive autoclave, and which has good adhesion to a glass plate and good transparency.

Further, the interlayer film has excellent workability in alignment, and after degassing with, for example, a rubber bag or a pressure rubber roll without using an autoclave, the interlayer film is laminated at a relatively low temperature, for example, 100 ° C. by an oven or a press. Since it can be processed, the manufacturing cost of laminated glass is reduced.

Furthermore, since the bonding process can be performed at a relatively low temperature as described above, not only an inorganic glass plate but also an organic glass plate such as polycarbonate or polymethylmethacrylate can be used as the glass plate without being thermally deformed. Also, 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 can be suitably used for window glass of buildings, transparent doors, transparent partition plates, window glass of vehicles and the like.

Claims (4)

[Claims] 1. A partially saponified ethylene-vinyl acetate copolymer obtained by partial esterification with a dicarboxylic acid anhydride, which comprises 0.5 to 35% by weight of vinyl acetate component, 4 to 18% by weight of vinyl alcohol component, and vinyl. Modified resin 1 containing 6 to 60% by weight of dicarboxylic acid partial ester component of alcohol
An interlayer film for laminated glass, which comprises 00 parts by weight and 0.01 to 4 parts by weight of a silane coupling agent. 2. The interlayer film for laminated glass according to claim 1, wherein the silane coupling agent comprises a compound represented by the following general formula (I). Embedded image (In the formula, R is a hydrocarbon group substituted with at least one amino group, X ^{1 to} X ³ are at least one alkoxy group, and the other are alkyl groups.) 3. The interlayer film for laminated glass according to claim 1, wherein the silane coupling agent comprises a compound represented by the following general formula (II). Embedded image (In the formula, R is a hydrocarbon group substituted with at least one amino group, X ^{4 to} X ⁶ are two alkoxy groups having 1 to 6 carbon atoms, and the others are alkyl groups having 1 to 6 carbon atoms.) 4. The interlayer film for laminated glass according to claim 1, wherein the silane coupling agent comprises a compound represented by the following general formula (III). Embedded image (In the formula, R is an N- (2-aminoethyl) -3-aminopropyl group, X ^{7 to} X ⁹ are two methoxy groups, and the others are methyl groups.)