JPH07309990A - Safety-glass interlayer - Google Patents

Abstract

PURPOSE:To obtain a safety-glass interlayer having a good moisture resistance and an excellent penetration resistance. CONSTITUTION:(A) a resin film formed from an ethylene-vinyl acetate copolymer having a vinyl acetate unit content of 15 to 45wt.%, or an ethylene-(meth)acrylic ester copolymer is laminated on (B) a resin film formed from a resin compsn. comprising 100 pts.wt. polyvinyl butyral resin having a degree of acetalization of 60 to 75mol% and 20-60 pts.wt. plasticizer to form a safety-glass interlayer.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an interlayer film for laminated glass which is excellent in transparency, weather resistance and penetration resistance.

[0002]

2. Description of the Related Art Conventionally, laminated glass has been widely used for various transportation means such as automobiles and airplanes and windows of buildings,
In general, two plate glasses are laminated and bonded via an interlayer film made of a plasticized polyvinyl butyral resin. Such a laminated glass has a property that the glass portion is damaged when an impact is applied from the outside, but the intermediate film interposed between the glass plates is not easily damaged and has a property of absorbing the impact. Impacts do not penetrate easily, and the broken glass plate remains attached to the interlayer film, so glass fragments do not scatter, and the human body in transport facilities and buildings is injured by the glass fragments. Can be prevented.

Japanese Patent Publication No. 42-24436 discloses a technique in which a potassium butyrate such as potassium acetate is added to a polyvinyl butyral resin to intentionally reduce the adhesion of the interlayer film to glass, thereby improving the penetration resistance. However, the plasticized polyvinyl butyral interlayer film containing an additive is colored during extrusion molding, and the laminated glass using this interlayer film has poor moisture resistance. There was a drawback that the sex was impaired.

In order to improve the above-mentioned drawbacks, the interlayer film has a laminated structure, and the interfacial adhesion of the glass / outermost layer is more than the outermost layer / outermost layer.
A method is known in which the penetration resistance is improved by extremely reducing the interfacial adhesion of the intermediate layer. For example, JP-A-63-21137 discloses an ethylene-vinyl acetate copolymer / polyethylene terephthalate / ethylene-
A technique is disclosed in which a laminated structure such as a vinyl acetate copolymer is provided and ethylene-vinyl acetate copolymers are separated from each other by polyethylene terephthalate. In addition, JP-A-56-
Japanese Patent No. 50147 discloses a technique in which polyvinyl butyral resin films are coated with silicone or laminated with polyvinyl butyral through a polyester and a cellulosic thin film having low adhesiveness, and peeled between polyvinyl butyral resin films to improve penetration resistance. Has been done.

However, the laminated structure of the above technique has a drawback in that, when it is impacted, fragments of glass and the outermost layer are scattered to cause a serious injury to a human body.

[0006]

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide an interlayer film for laminated glass which has good moisture resistance and excellent penetration resistance.

[0007]

SUMMARY OF THE INVENTION The gist of the present invention is to provide an interlayer film for laminated glass with an ethylene-vinyl acetate copolymer or an ethylene-vinyl acetate copolymer having a vinyl acetate content of 15 to 45% by weight.
A resin film (A) made of a (meth) acrylic acid ester copolymer, 100 parts by weight of a polyvinyl butyral resin having an acetalization degree of 65 to 70 mol%, and a plasticizer 20 to
It consists in laminating | stacking with the resin film (B) formed from the resin composition which consists of 60 weight parts.

The ethylene-vinyl acetate copolymer used in the present invention has a vinyl acetate content of 15 to 45% by weight. If it is less than 15% by weight, the transparency of the resin is lowered and 4
If it exceeds 5% by weight, the mechanical strength of the resin film is remarkably lowered and the penetration resistance of the obtained laminated glass is lowered, so that the content is limited to the above range. It is preferably 20 to 40% by weight.

Examples of the (meth) acrylic acid ester of the ethylene- (meth) acrylic acid copolymer used in the present invention include methyl methacrylate, butyl acrylate,
2-Ethylhexyl acrylate and the like can be mentioned. These may be used alone or in combination of two or more. When the content of the (meth) acrylic acid ester is small, the transparency of the obtained laminate decreases, and when it is large, the impact resistance of the obtained laminate decreases, so 5 to 50% by weight is preferable.

The interlayer film made of the above ethylene-vinyl acetate copolymer or the above ethylene- (meth) acrylic acid ester copolymer is, for example, within the range not impairing the physical properties,
UV absorbers, UV stabilizers, antioxidants, stabilizers and the like may be added. Further, a silane coupling agent may be added to improve the adhesiveness with glass.

Examples of the ultraviolet absorber include 2-
(2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-5′-t-butylphenyl) 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'- J-t
-Butylphenyl) -5-chlorobenzotriazole,
2- (2′-hydroxy-3 ′, 5′-di-t-aminephenyl) benzotriazole, 2- [2′-hydroxy-3 ′-(3 ″, 4 ″, 5 ″ ″, 6 ′ '-Tetrahydrophthalimidomethyl) -5'-methylphenyl]
Benzotriazoles such as benzotriazole; 2,4
-Dihydroxybenzophenone, 2-hydroxy-4-
Methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2,2 ″ -dihydroxy-4,
4 ″ -dimethoxybenzophenone, 2-hydroxy-
Benzophenone series such as 4-methoxy-5-sulfobenzophenone; 2-ethylhexyl-2-cyano-3,3 '
-Diphenyl acrylate, ethyl-2-cyano-3,
Examples include cyanoacrylates such as 3'-diphenyl acrylate.

Examples of the UV stabilizers include bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate and tetrakis (2,2,6,6-tetramethyl-4-piperidyl) -1. , 2,3,4-Butane tetracarboxylate, Sanol LS-765 (manufactured by Sankyo Kasei), Sanol LS-770 (manufactured by Sankyo Kasei), S
anol LS-2628 (manufactured by Sankyo Kasei), Chim
assob 944LD (manufactured by Ciba Geigy), tinuvin-662 (manufactured by Ciba Geigy), tinuvin-662L
D (manufactured by Ciba Geigy), Mark LA-57 (manufactured by ADEKA ARGUS), Mark LA-62 (manufactured by ADEKA ARGUS), Mark LA-63 (manufactured by ADEKA ARGUS), Mark LA-67 (manufactured by ADEKA ARGUS). ,
Mark LA-68 (manufactured by ADEKA ARGUS CORPORATION), Mar
k LA-77 (manufactured by ADEKA ARGUS CORPORATION), Mark L
A-82 (manufactured by ADEKA ARGUS CORPORATION), Mark LA-8
7 (manufactured by ADEKA ARGUS), Goodrite UV-
3404 (manufactured by Goodrich Co.) and the like; nickel [2,2'-thiobis (4-t-octyl) phenolate] -n-butylamine, nickel dibutyldithiocarbamate, nickel bis [o-ethyl-
3,5- (di-t-butyl-4-hydroxybenzyl)] phosphate, cobalt dicyclohexyldithiophosphate, [1-phenyl, 3-methyl, 4-decanonyl, pyrazolate (5) ₂ ] nickel and other metal complex salts Is mentioned.

Examples of the antioxidant include t-butyl-hydroxytoluene (BHT), t-butyl-hydroxyanisole, 2,6-di-t-butyl-p-cresol and 2,6-di-t. -Butyl-4-ethylphenol, stearyl-β- (3,5-di-t-butyl-4
-Hydroxyphenyl) propionate, 2,2'-methylenebis (4-methyl-6-t-butylphenol), 2,2'-methylenebis (4-ethyl-6-t-)
Butylphenol), 4,4'-thiobis (3-methyl-6-t-butylphenol), 4,4'-butylidene-bis (3-methyl-6-t-butylphenol),
1,1,3-tris (2-methyl-4-hydroxy-5)
-T-butylphenyl) butane, 1,1,3-tris (2-methyl-4-hydroxy-5-t-butylphenol) butane, tetrakis [methylene-3- (3 ',
5'-Butyl-4'-hydroxyphenyl) propionate] methane, 1,3,5-trimethyl-2,4,6-
Tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene, bis [3,3'-bis (4'-hydroxy-3'-t-butylphenol) butyric acid] glycol ester and the like can be mentioned. .

Examples of the stabilizer include sodium laurate, alkylbenzene sulfonic acid, calcium stearate soap, dialkanol aliphatic tertiary amine and the like.

Examples of the silane coupling agent include those having an amino group, a glycidyl group or a mercapto group, and examples thereof include 3-aminopropyldimethylethoxysilane, 3-aminopropylmethyldiethoxysilane and N- ( 2-aminoethyl) -3-aminopropylmethyldimethoxysilane, 3-glycidoxypropyldimethylethoxysilane, 3-glycidoxypropyltrimethoxysilane, mercaptomethyldimethylethoxysilane, 3-mercaptopropyltriethoxysilane and the like. To be These may be used alone or in combination of two or more.

The polyvinyl butyral resin used in the present invention is obtained by acetalizing polyvinyl alcohol with butyraldehyde, and usually has a butyral group, an acetyl group and a hydroxyl group in the ethylene group of the main chain.
The average degree of polymerization of polyvinyl alcohol, which is a raw material for producing polyvinyl butyral resin, is preferably 500 to 300.
It is 0. If the average degree of polymerization is less than 500, the film formed from the obtained resin has poor mechanical strength, and the laminated glass using the same has low penetration resistance. When the average degree of polymerization exceeds 3,000, the melt viscosity of the resin is too high, which is not preferable in the stage of film formation. More preferable average degree of polymerization is 10
It is 00 to 2500.

The degree of saponification of the polyvinyl alcohol is preferably 95 mol% or more because it has excellent transparency and heat resistance. The degree of acetalization of the polyvinyl butyral resin is 60 to 75 mol%. If it is less than 60 mol%, the resulting film will be too hard to show good elongation,
The compatibility with the plasticizer is poor, the transparency is also impaired, and if it exceeds 75 mol%, the resulting film becomes too soft and is not preferable, so the content is limited to the above range.

Examples of the plasticizer used in the present invention include organic plasticizers such as monobasic acid esters and polybasic acid esters, and phosphoric acid plasticizers such as organic phosphoric acid compounds and organic phosphorous acid compounds. Is mentioned. Examples of the monobasic acid ester include butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid,
Heptanoic acid, n-octylic acid, 2-ethylhexyl acid,
An ester obtained by reacting an organic acid such as pelargonic acid (n-nonyl acid) or decyl acid with triethylene glycol is preferable, and more preferably triethylene glycol-di-2-ethylbutyrate or triethylene glycol-diester. -2-ethylhexoate, triethylene glycol-di-capronate, triethylene glycol-
Di-n-octoate and the like. Further, esters of tetraethylene glycol or tripropylene glycol and the above organic acids can also be used.

The above polybasic acid ester plasticizers include
For example, an ester of an organic acid such as adipic acid, sebacic acid, azelaic acid and a linear or branched alcohol having 4 to 8 carbon atoms is preferable, more preferably dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate and the like. Is.

Examples of the phosphoric acid plasticizer include tributoxyethyl phosphate, isodecylphenyl phosphate, triisopropyl phosphate and the like.

The amount of the plasticizer added is 20 to 60 parts by weight based on 100 parts by weight of the polyvinyl butyral resin. When the amount is less than 20 parts by weight, the film formation becomes very difficult, and the obtained film shows almost no elongation. When the amount exceeds 60 parts by weight, the plasticizer bleeds out and the transparency is impaired. Limited in scope. It is preferably 30 to 55 parts by weight.

In order to prevent the deterioration of the polyvinyl butyral resin, for example, stabilizers, antioxidants, ultraviolet absorbers, etc. are necessary at the time of mixing the polyvinyl butyral resin with the plasticizer and in the production process of the polyvinyl butyral resin. It can be used as appropriate.

Examples of the stabilizers include surfactants, sodium lauryl sulfate, alkylbenzene sulfonic acid and the like.

As the above-mentioned antioxidant, for example, BH
T, tetrakis [methylene-3- (3'-5'-di-t
-Butyl-4'-hydroxytephenyl) propionate] methane (Irganox 1010, manufactured by Ciba-Geigy) and the like, phenolic compounds such as LA-57 (manufactured by ADEKA ARGUS), and the like. .

Examples of the ultraviolet absorber include 2-
(2'-hydroxy-5'-methylphenyl) benzotriazole (Tinuvin P, manufactured by Ciba Geigy), 2-
(2'-hydroxy-3 ', 5'-di-t-butylphenyl) benzotriazole (Tinuvin 320, manufactured by Ciba-Geigy), 2- (2'-hydroxy-3'-t-butyl-5'-methylphenyl) ) -5-chlorobenzotriazole (Tinuvin 326, manufactured by Ciba Geigy) and the like, and LA-57 (manufactured by ADEKA ARGUS) and the like hindered amines.

The laminated structure of the interlayer film for laminated glass of the present invention is, for example, a two-layer structure of resin film (A) / resin film (B), resin film (B) / resin film (A) / resin film ( B), resin film (A) / resin film (B) / resin film (A), and other three-layered structure, and resin film (B) / resin film (A) / resin film (B)
/ Constituents of four or more layers such as the resin film (A) are listed.

The thickness of the interlayer film for laminated glass laminated by the above laminated constitution is preferably 0.2 to 1.6 mm, more preferably 0.3 to 1.2 mm. 0.2
If it is less than mm, the penetration resistance of the obtained laminated glass cannot be secured, and if it exceeds 1.6 mm, the transparency of the obtained laminated glass decreases, which is not preferable from the viewpoint of cost. Regarding the thickness of the resin film (A) and the resin film (B) that form the intermediate film for laminated glass, the difference in film thickness between them is 0.4.
It is preferably less than or equal to mm. If it exceeds 0.4 mm, the improvement of the penetration resistance in the lamination will not be realized.

The method for forming the interlayer film for laminated glass is not limited to the usual extrusion molding, calender molding, etc., but the resin is dissolved in a solvent, and this solution is applied by a suitable coater to form a coating film. After that, a method of obtaining a film by drying may be used.

As a method for producing a laminated glass by sandwiching the above interlayer film for laminated glass between glass plates, a method used in ordinary production of laminated glass may be used.
For example, a laminated film obtained by appropriately stacking the resin film (A) and the resin film (B) is sandwiched with glass plates from both sides, and the unpressed sandwich is degassed and hot pressed to obtain a laminated glass. And a method of laminating and adhering the laminated film of the resin film (A) and the resin film (B) between the glasses by a multilayer extrusion molding method.

[0030]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

Example 1 Preparation of Resin Membrane (A) As an ethylene-vinyl acetate copolymer, 50 g of an ethylene-vinyl acetate copolymer (Ultrasen 634, manufactured by Tosoh Corporation) having a vinyl acetate content of 26% by weight, As a silane coupling agent, 0.25 g of 3-aminopropyltriethoxysilane (0.5 parts by weight based on 100 parts by weight of resin), and as an ultraviolet absorber, 2- (2'-hydroxy-).
0.15 g (0.3 parts by weight) of 3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole (Tinuvin 326, manufactured by Ciba-Geigy) and t-butyl-hydroxytoluene 0 as an antioxidant .05 g (0.
1 part by weight) was supplied to a roll mill and melt-kneaded at a temperature of 150 ° C. to obtain a resin composition. The obtained composition was press-molded with a press molding machine at 130 ° C. and 120 kg / cm ² for 30 minutes to obtain a resin film (A) having a thickness of 0.4 mm.

Preparation of Resin Film (B) ( Preparation of Resin) To 2900 g of pure water, 190 g of polyvinyl alcohol having a polymerization degree of 1700 and a saponification degree of 99.2 mol% was added and dissolved by heating. Temperature of the reaction system was adjusted, and 201 g of 35% by weight hydrochloric acid
(1.99% by weight relative to the total system), n-butyraldehyde 1
24 g was added to precipitate a polyvinyl butyral resin. Then, the reaction system was kept at a temperature of 50 ° C. for 4 hours to complete the reaction. By washing with excess water, unreacted aldehyde was washed away, the hydrochloric acid catalyst was neutralized, and the salt was removed to obtain a white powder of polyvinyl butyral resin. The butyralization degree of this resin is measured by the following titration method,
It was 66.3 mol%.

Adjustment of Resin Film (B) (Adjustment of Film) 50 g of the above polyvinyl butyral resin and triethylene glycol-di-2-ethylbutyrate 20 as a plasticizer
g (40 parts by weight based on 100 parts by weight of resin), 0.1 g of t-butyl-hydroxytoluene as an antioxidant (0.
2 parts by weight), 0.1 g (0.2 parts by weight) of 2- (2'-hydroxy-5'-methylphenyl) benzotriazole (Tinuvin P, manufactured by Ciba-Geigy) as an ultraviolet absorber.
Was added, and the mixture was supplied to a roll mill and melt-kneaded at a temperature of 150 ° C. to obtain a resin composition. The obtained composition was press-molded with a press molding machine at 150 ° C. and 120 kg / cm ² for 30 minutes to obtain a resin film (B) having a thickness of 0.2 mm.

Manufacture of Laminated Glass The resin film (A) and the resin film (B) are laminated in the structure of resin film (B) / resin film (A) / resin film (B),
An interlayer film for laminated glass was manufactured. The obtained interlayer film for laminated glass was sandwiched with a piece of float glass having a thickness of 300 mm and a thickness of 2.5 mm, and the sandwiched body was placed in a vacuum bag and held at a vacuum degree of 20 torr for 20 minutes to be evacuated. Held in an oven at 90 ° C for 30 minutes. The sandwiched body taken out after this was pressured at 12 kg / cm in the autoclave.
² , hot pressed at a temperature of 135 ° C. to obtain a transparent laminated glass. A penetration resistance test and a cloud value test were performed by the following methods using the obtained laminated glass. The results are shown in Table 1.

Titration method The degree of acetalization was measured by the hydroxylamine hydrochloride method based on the test method in the section "Vinyl acetal" in the composition analysis of JIS K 6728 1977 "Test method for polyvinyl acetal". Penetration resistance test The prepared laminated glass is held horizontally by a supporting frame of 300 mm x 300 mm, and a 2.26 kg steel ball is freely dropped from above the laminated glass to the center of the test piece at a temperature of 20 ° C. When the laminated glass interferes with the steel ball in the test corresponding to 50% of the number of tests in which the test is repeated while gradually increasing the height of the steel ball, the falling ball height is defined as the distance from the glass surface of the steel ball. Therefore, the larger the falling ball height value, the better the penetration resistance. Haze value test The haze value (Haze) of the laminated glass was measured using an integral turbidimeter (manufactured by Tokyo Denshoku Co., Ltd.). The smaller the Haze value, the better the transparency of the sample.

Example 2 Ethylene- (meth) acrylic acid copolymer having a methacrylic acid ester content of 20% by weight
(Meth) acrylic acid ester copolymer (Aklift WH
202, Sumitomo Chemical Co., Ltd.) 50 g, 2- (2'-hydroxy-3'-t-butyl-5 'as an ultraviolet absorber
-Methylphenyl) -5-chlorobenzotriazole (Tinuvin 326, manufactured by Ciba Geigy) 0.15 g
(0.3 parts by weight) and t-butyl-
0.05 g (0.1 part by weight) of hydroxytoluene was supplied to a roll mill and melt-kneaded at a temperature of 200 ° C. to obtain a resin composition. The obtained composition is 150 by a press molding machine.
A resin film (A) having a thickness of 0.4 mm was obtained by press molding at 120 ° C. and 120 kg / cm ² for 30 minutes, and a laminated glass was prepared in the same manner as in Example 1 and tested. The results are shown in Table 1.

Example 3 As the ethylene-vinyl acetate copolymer, an ethylene-vinyl acetate copolymer having a vinyl acetate content of 28% by weight (Ultrasen 751, manufactured by Tosoh Corporation) was used and the resin film (A) was used. It was created. N as polyvinyl butyral resin
-By adding 134 g of butyraldehyde, the degree of acetalization is 7
A resin of 1 mol% was prepared, and 15 g of a plasticizer (30 parts by weight based on 100 parts by weight of the resin) was added to the resin to prepare a resin film (B). The obtained resin film was laminated on resin film (B) / resin film (A) / resin film (B) / resin film (A) / resin film (B), and each film thickness was 0.1 / 0.2. /0.1/
0.2 / 0.1 (unit: mm) and laminated glass was prepared in the same manner as in Example 1 and tested. The results are shown in Table 1.

Example 4 As the ethylene-vinyl acetate copolymer, 50 g of an ethylene-vinyl acetate copolymer (Ultrasen 720, manufactured by Tosoh Corporation) having a vinyl acetate content of 32% by weight was used and a resin film (A )made. As a polyvinyl butyral resin, 105 g of n-butyraldehyde was added to prepare a resin having an acetalization degree of 61.5 mol%, and 25 g of a plasticizer (50 parts by weight relative to 100 parts by weight of resin) was added to this resin to form a resin film. (B) was prepared. The obtained resin film was laminated on the resin film (A) / resin film (B) / resin film (A), and each film thickness was 0.2 / 0.5 / 0.2 (unit: mm). A laminated glass was prepared and tested in the same manner as in Example 1. The results are shown in Table 1.

Example 5 As the ethylene-vinyl acetate copolymer, 50 g of an ethylene-vinyl acetate copolymer (Ultrasen 720, manufactured by Tosoh Corporation) having a vinyl acetate content of 20% by weight was used and a resin film (A ) Was prepared and a laminated glass was prepared and tested in the same manner as in Example 1. The results are shown in Table 1.
It was shown to.

Example 6 As an ethylene-vinyl acetate copolymer, 50 g of an ethylene-vinyl acetate copolymer (Ultrasen 762, manufactured by Tosoh Corporation) having a vinyl acetate content of 42% by weight was used and a resin film (A )made. As a polyvinyl butyral resin, 105 g of n-butyraldehyde was added to prepare a resin having an acetalization degree of 61.5 mol%, and 25 g of a plasticizer (50 parts by weight relative to 100 parts by weight of resin) was added to this resin to form a resin film. (B) was prepared. The obtained resin film is used as resin film (A) / resin film (B) / resin film (A) / resin film (B) /
Laminated on the resin film (A), each film thickness is 0.1 / 0.2 / 0.
3 / 0.2 / 0.1 (unit: mm), and the following Example 1
A laminated glass was prepared and tested in the same manner as in. The results are shown in Table 1.

Comparative Example 1 As an ethylene-vinyl acetate copolymer, 50 g of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 10% by weight (Ultrasen 541, manufactured by Tosoh Corporation) was used and a resin film (A ) Was prepared and a laminated glass was prepared and tested in the same manner as in Example 1. The results are shown in Table 1.
It was shown to.

Comparative Example 2 As a polyvinyl butyral resin, 152 g of n-butyraldehyde was added to prepare a resin having an acetalization degree of 81.5 mol%, and 10 g of a plasticizer (20 parts by weight to 100 parts by weight of the resin) was added to this resin. A laminated glass was prepared and tested in the same manner as in Example 4 except that the resin film (B) was prepared by addition. The results are shown in Table 1.

Comparative Example 3 As a polyvinyl butyral resin, 124 g of n-butyraldehyde was added to prepare a resin having an acetalization degree of 66.3 mol%, and 7.5 g of a plasticizer (15 parts by weight to 100 parts by weight of the resin) was added to the resin. ) Was added to form the resin film (B), a laminated glass was prepared and tested in the same manner as in Example 3. The results are shown in Table 1.

Comparative Example 4 As a polyvinyl butyral resin, 124 g of n-butyraldehyde was added to prepare a resin having an acetalization degree of 66.3 mol%, and 35 g of a plasticizer was added to this resin (70 parts by weight based on 100 parts by weight of the resin). A laminated glass was prepared and tested in the same manner as in Example 3 except that the resin film (B) was prepared by addition. The results are shown in Table 1.

Comparative Example 5 The polyvinyl butyral resin composition used in Example 1 was press-molded to a thickness of 0.8 mm to form a resin film, and a laminated glass was prepared from this film alone, and a test was conducted. The results are shown in Table 1.

Comparative Example 6 The ethylene-vinyl acetate copolymer used in Example 1 was press-molded to a thickness of 0.8 mm to prepare a resin film, and a laminated glass was prepared from this film alone and tested. . The results are shown in Table 1.

Comparative Example 7 The ethylene- (meth) acrylic acid copolymer used in Example 2 was press-molded to a thickness of 0.8 mm to form a resin film, and a laminated glass was prepared using this film alone, and tested. I went. The results are shown in Table 1.

[0048]

[Table 1]

[0049]

The interlayer film for laminated glass of the present invention is a resin film made of an ethylene-vinyl acetate copolymer or an ethylene- (meth) acrylic acid ester copolymer having a vinyl acetate content of 15 to 45% by weight. (A) and polyvinyl butyral resin 1 having a degree of acetalization of 60 to 75 mol%.
Since the resin film (B) formed of a resin composition comprising 00 parts by weight and a plasticizer of 20 to 60 parts by weight is laminated, the transparency, light resistance and penetration resistance are remarkably improved.

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display area C08K 5/51

Claims (1)

[Claims] 1. A resin film (A) comprising an ethylene-vinyl acetate copolymer or an ethylene- (meth) acrylic acid ester copolymer having a vinyl acetate content of 15 to 45% by weight.
And a resin film (B) formed of a resin composition comprising 100 parts by weight of a polyvinyl butyral resin having a degree of acetalization of 60 to 75 mol% and 20 to 60 parts by weight of a plasticizer. An interlayer film for laminated glass.