JP6247047B2 - Laminated glass interlayer film and laminated glass - Google Patents

Description

The present invention relates to an interlayer film for laminated glass that can control adhesion and is excellent in moisture resistance. Moreover, this invention relates to the laminated glass containing this intermediate film for laminated glasses.

Laminated glass is safe because it does not scatter glass fragments even if it is damaged by an external impact, so it can be used as a windshield, side glass, rear glass for vehicles such as automobiles, and window glass for aircraft, buildings, etc. Widely used. As laminated glass, for example, laminated glass in which an interlayer film for laminated glass including a liquid plasticizer and polyvinyl acetal is interposed between at least a pair of glasses is integrated.

For example, in order to use laminated glass for a windshield of a vehicle such as an automobile, it is necessary to appropriately control the adhesiveness between the interlayer film for laminated glass and the glass. An interlayer film for laminated glass containing polyvinyl acetal and a plasticizer tends to have an excessively strong adhesion to glass. When a human body or the like collides with the laminated glass having a strong adhesion of the interlayer film for laminated glass to the glass, it becomes difficult for the laminated glass to absorb the impact caused by the collision of the human body or the like. On the other hand, when a human body or the like collides with the laminated glass having a weak adhesive force of the interlayer film for laminated glass to the glass, the human body or the like easily penetrates the laminated glass. For this reason, in order to control the adhesiveness of the intermediate film for laminated glasses and glass, the adhesive force regulator is normally used.

Patent Document 1 discloses an interlayer film for laminated glass containing a matrix resin, a liquid plasticizer, 20 to 120 ppm of alkali metal, and 15 to 60 ppm of magnesium. Patent Document 1 describes potassium hexanoate and the like as an aspect of blending an alkali metal, and magnesium hexanoate and the like as an aspect of blending magnesium. The adhesiveness between the interlayer film for laminated glass and the glass is adjusted by using an alkali metal salt such as potassium hexanoate and a magnesium salt such as magnesium hexanoate, but the adhesiveness cannot be adjusted with a single metal salt. There is a problem.

WO 06/095770 pamphlet

An object of this invention is to provide the intermediate film for laminated glasses which can control adhesiveness and is excellent in moisture resistance. Another object of the present invention is to provide a laminated glass including the interlayer film for laminated glass.

The present invention is an interlayer film for laminated glass having a first resin layer containing polyvinyl acetal, a plasticizer, a potassium salt of a carboxylic acid having 1 to 5 carbon atoms, and a moisture resistance improver.
The present invention is described in detail below.

The inventors of the present invention have studied to appropriately control the adhesion between the interlayer film for laminated glass and the glass using a single metal salt. The interlayer film for laminated glass containing a potassium salt of a specific carboxylic acid. Has found that the adhesion to glass can be easily adjusted. However, the interlayer film for laminated glass containing a specific potassium salt of carboxylic acid has a problem that the moisture resistance is lowered. Therefore, the present inventors can control the adhesion between the interlayer film for laminated glass and the glass by using polyvinyl acetal, a plasticizer, a metal salt of a specific carboxylic acid, and a moisture resistance improver, And it discovered that the intermediate film for laminated glasses excellent in moisture resistance was obtained, and came to complete this invention.

The interlayer film for laminated glass of the present invention is for laminated glass having a first resin layer containing polyvinyl acetal, a plasticizer, a potassium salt of a carboxylic acid having 1 to 5 carbon atoms, and a moisture resistance improver. It is an interlayer film. By using polyvinyl acetal, a plasticizer, a potassium salt of a carboxylic acid having 1 to 5 carbon atoms, and a moisture resistance improver, an interlayer film for laminated glass that can control adhesion and is excellent in moisture resistance is obtained. It is done.

The interlayer film for laminated glass of the present invention may be a single-layer interlayer film including only the first resin layer, and is disposed on one surface of the first resin layer and the first resin layer. It may be a multilayer intermediate film having a second resin layer. When the interlayer film for laminated glass of the present invention is a multilayer interlayer film, the first resin layer is preferably disposed as the outermost layer of the multilayer interlayer film. The second resin layer preferably contains polyvinyl acetal. The second resin layer may be directly laminated on one surface of the first resin layer.

The first resin layer contains polyvinyl acetal.
The polyvinyl acetal is not particularly limited as long as it is a polyvinyl acetal obtained by acetalizing polyvinyl alcohol with an aldehyde, but polyvinyl butyral is preferable. Moreover, you may use together 2 or more types of polyvinyl acetal as needed.
The preferable lower limit of the degree of acetalization of the polyvinyl acetal is 40 mol%, the preferable upper limit is 85 mol%, the more preferable lower limit is 60 mol%, and the more preferable upper limit is 75 mol%.

The polyvinyl acetal has a preferred lower limit of the hydroxyl group content of 15 mol% and a preferred upper limit of 35 mol%. When the hydroxyl group amount is 15 mol% or more, the interlayer film for laminated glass can be easily molded. When the amount of hydroxyl group is 35 mol% or less, handling of the resulting interlayer film for laminated glass becomes easy.
The degree of acetalization and the amount of hydroxyl groups can be measured in accordance with, for example, JIS K6728 “Testing method for polyvinyl butyral”.

The polyvinyl acetal can be prepared by acetalizing polyvinyl alcohol with an aldehyde. The polyvinyl alcohol is usually obtained by saponifying polyvinyl acetate, and polyvinyl alcohol having a saponification degree of 70 to 99.8 mol% is generally used.
The preferable lower limit of the polymerization degree of the polyvinyl alcohol is 500, and the preferable upper limit is 4000. When the polymerization degree of the polyvinyl alcohol is 500 or more, the penetration resistance of the obtained laminated glass is increased. When the polymerization degree of the polyvinyl alcohol is 4000 or less, the interlayer film for laminated glass can be easily molded. The minimum with a more preferable polymerization degree of the said polyvinyl alcohol is 1000, and a more preferable upper limit is 3600.

The aldehyde is not particularly limited, but generally an aldehyde having 1 to 10 carbon atoms is preferably used. The aldehyde having 1 to 10 carbon atoms is not particularly limited. For example, n-butyraldehyde, isobutyraldehyde, n-valeraldehyde, 2-ethylbutyraldehyde, n-hexylaldehyde, n-octylaldehyde, n-nonylaldehyde N-decylaldehyde, formaldehyde, acetaldehyde, benzaldehyde and the like. Of these, n-butyraldehyde, n-hexylaldehyde, and n-valeraldehyde are preferable, and n-butyraldehyde is more preferable. These aldehydes may be used alone or in combination of two or more.

The first resin layer includes a plasticizer. The plasticizer is not particularly limited, and examples thereof include organic ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, phosphoric acid plasticizers such as organic phosphoric acid plasticizers and organic phosphorous acid plasticizers, and the like. Is mentioned. The plasticizer is preferably a liquid plasticizer.

The monobasic organic acid ester is not particularly limited. For example, 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 esters obtained by reaction with monobasic organic acids such as acid, 2-ethylhexyl acid, pelargonic acid (n-nonyl acid), and decyl acid. Of these, triethylene glycol dicaproate, triethylene glycol di-2-ethylbutyrate, triethylene glycol di-n-octylate, triethylene glycol di-2-ethylhexylate and the like are preferable.

Although the said polybasic organic acid ester is not specifically limited, For example, ester compound of polybasic organic acid, such as adipic acid, sebacic acid, azelaic acid, and the alcohol which has a C4-C8 linear or branched structure 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, tetraethylene glycol di-2-ethylhexanoate, dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate, ethylene glycol di-2-ethyl Butyrate, 1,3-propylene glycol di-2-ethyl butyrate, 1,4-butylene glycol di-2-ethyl butyrate, diethylene glycol di-2-ethyl butyrate, diethylene glycol di- -Ethyl hexanoate, dipropylene glycol di-2-ethyl butyrate, triethylene glycol di-2-ethyl pentanoate, tetraethylene glycol di-2-ethyl butyrate, diethylene glycol dicapryate, dihexyl adipate, adipine Dioctyl acid, hexyl cyclohexyl adipate, diisononyl adipate, heptylnonyl adipate, dibutyl sebacate, oil-modified sebacic acid alkyd, a mixture of phosphate ester and adipic acid ester, adipic acid ester, alkyl alcohol having 4 to 9 carbon atoms and Examples thereof include mixed adipic acid esters prepared from cyclic alcohols having 4 to 9 carbon atoms and adipic acid esters having 6 to 8 carbon atoms such as hexyl adipate.

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

Among the above plasticizers, dihexyl adipate (DHA), triethylene glycol di-2-ethylhexanoate (3GO), tetraethylene glycol di-2-ethylhexanoate (4GO), triethylene glycol di-2- Selected from the group consisting of ethyl butyrate (3GH), tetraethylene glycol di-2-ethylbutyrate (4GH), tetraethylene glycol di-n-heptanoate (4G7) and triethylene glycol di-n-heptanoate (3G7) It is preferable that it is at least one kind.

Furthermore, since it is difficult to cause hydrolysis as the plasticizer, triethylene glycol di-2-ethylhexanoate (3GO), triethylene glycol di-2-ethylbutyrate (3GH), tetraethylene glycol di-2- It preferably contains ethyl hexanoate (4GO) and dihexyl adipate (DHA), and tetraethylene glycol di-2-ethylhexanoate (4GO) and triethylene glycol di-2-ethylhexanoate (3GO). More preferably, it contains triethylene glycol di-2-ethylhexanoate, and even more preferably.

The content of the plasticizer in the first resin layer is not particularly limited, but a preferable lower limit with respect to 100 parts by weight of the polyvinyl acetal is 30 parts by weight, and a preferable upper limit is 70 parts by weight. When the content of the plasticizer is 30 parts by weight or more, the melt viscosity of the laminated glass interlayer film becomes low, so that the laminated glass interlayer film can be easily formed. When the content of the plasticizer is 70 parts by weight or less, the transparency of the interlayer film for laminated glass increases. The minimum with more preferable content of the said plasticizer is 35 weight part, and a more preferable upper limit is 63 weight part.

The first resin layer contains a potassium salt of a carboxylic acid having 1 to 5 carbon atoms.
By including the potassium salt, the adhesive force between the interlayer film for laminated glass and the glass can be easily controlled. The carboxylic acid having 1 to 5 carbon atoms is not particularly limited, but formic acid, acetic acid, propionic acid, n-butanoic acid, i-butanoic acid, n-pentanoic acid, i-pentanoic acid, vivalic acid, hydroangelic acid, etc. Is mentioned. Since the adhesiveness between the interlayer film for laminated glass and the glass can be more easily controlled, the carboxylic acid having 1 to 5 carbon atoms is more preferably formic acid, acetic acid or propionic acid, and formic acid or acetic acid is more preferable. Formic acid is preferred and particularly preferred. The potassium salt is not particularly limited, but potassium formate, potassium acetate, potassium propionate, potassium n-butanoate, potassium i-butanoate, potassium n-pentanoate, potassium i-pentanoate, potassium vibalate or hydroangelica A potassium acid etc. are mentioned. Since the adhesion between the interlayer film for laminated glass and the glass can be more easily controlled, the potassium salt is at least one selected from the group consisting of potassium formate, potassium acetate, and potassium propionate. Preferably, potassium formate or potassium acetate is more preferable, and potassium formate is still more preferable.

Although content of the said potassium salt is not specifically limited, The preferable minimum with respect to 100 weight part of said polyvinyl acetals is 0.001 weight part, and a preferable upper limit is 0.5 weight part. When the content of the potassium salt is 0.001 part by weight or more, the penetration resistance of the laminated glass is increased. When the content of the potassium salt is 0.5 parts by weight or less, the transparency of the interlayer film for laminated glass increases. The minimum with more preferable content of the said potassium salt is 0.015 weight part, and a more preferable upper limit is 0.25 weight part.
Since the adhesiveness between the interlayer film for laminated glass and the glass can be more easily controlled, the content of potassium element in the first resin layer is preferably 300 ppm or less, and 250 ppm or less. Is more preferably 200 ppm or less, and particularly preferably 150 ppm or less. The potassium element may be contained as potassium derived from a potassium salt, or may be contained as potassium derived from a neutralizing agent used when synthesizing polyvinyl acetal. A preferred lower limit of the content of potassium element in the first resin layer is 30 ppm, a more preferred lower limit is 80 ppm, a still more preferred lower limit is 100 ppm, and a particularly preferred lower limit is 120 ppm.

The first resin layer may contain a magnesium salt as long as the solution of the problem of the present invention is not hindered. By including the magnesium salt, the adhesive force between the interlayer film for laminated glass and the glass can be more easily controlled. Although the said magnesium salt is not specifically limited, It is preferable that it is a C2-C16 organic acid magnesium salt, and it is more preferable that it is a C2-C16 carboxylic acid magnesium salt. Although it does not specifically limit as said C2-C16 carboxylic acid magnesium salt, For example, magnesium acetate, magnesium propionate, 2-ethylbutanoic acid magnesium, 2-ethylhexanoic acid magnesium, etc. are mentioned.

Although content of the said magnesium salt is not specifically limited, The preferable minimum with respect to 100 weight part of said polyvinyl acetals is 0.02 weight part, and a preferable upper limit is 0.5 weight part. When the content of the magnesium salt is 0.02 parts by weight or more, the penetration resistance of the laminated glass is increased. When the content of the magnesium salt is 0.5 parts by weight or less, the transparency of the interlayer film for laminated glass increases. The minimum with more preferable content of the said magnesium salt is 0.03 weight part, and a more preferable upper limit is 0.2 weight part.
Since the adhesiveness of the interlayer film for laminated glass of the present invention can be more easily controlled, the magnesium element content in the first resin layer is preferably 80 ppm or less. The magnesium element may be included as magnesium derived from a magnesium salt, or may be included as magnesium derived from a neutralizing agent used when synthesizing polyvinyl acetal. A preferable lower limit of the content of magnesium element in the first resin layer is 20 ppm, a more preferable upper limit is 75 ppm, a more preferable lower limit is 30 ppm, and a still more preferable upper limit is 70 ppm. In addition, content of the said potassium element or the said magnesium element can be measured with an ICP emission spectrometer (“ICPE-9000” manufactured by Shimadzu Corporation).

The first resin layer includes a moisture resistance improver.
In order to adjust the adhesive force between the interlayer film for laminated glass and the glass, a potassium salt of a carboxylic acid having 1 to 5 carbon atoms is added as an adhesive force adjusting agent, so that the adhesive force can be easily adjusted. it can. However, the interlayer film for laminated glass having the first resin layer containing a potassium salt of a carboxylic acid having 1 to 5 carbon atoms has a problem that moisture resistance is lowered. Therefore, the first resin layer contains a moisture resistance improver.
By using a compound that is excellent in compatibility with the potassium salt or a compound that captures the potassium salt as the moisture resistance improver, it is considered that water hardly collects around the potassium salt and the moisture resistance is improved.

Examples of the compound having excellent compatibility with the potassium salt include compounds having an anionic functional group.
Examples of the anionic functional group include a phosphoric acid (ester) group, a carboxylic acid (ester) group, and a sulfonic acid group. Among these, a phosphoric acid (ester) group is preferable because of excellent moisture resistance.
Examples of the compound having an anionic functional group include polyoxyethylene alkyl ether phosphates such as polyoxyethylene lauryl ether phosphate, polyoxyethylene tridecyl ether phosphate, and polyoxyethylene lauryl ether phosphate. Can be mentioned.

As a compound which capture | acquires the said potassium salt, the compound etc. which have the said nonionic functional group are mentioned, for example.
Examples of the nonionic functional group include an ether group and a hydroxy group.
As the compound having an ether group, crown ether is preferable because it has an excellent effect of capturing a potassium salt.

Specific examples of the moisture resistance improver include, for example, a phosphate ester represented by the following general formula (1) as a compound having the anionic functional group, a compound having a molecular weight of 100 or more having a carboxylic acid group, Examples of the compound that captures the potassium salt include 18-crown ether-6. These moisture resistance improvers also function as a dispersant described later.

In the general formula (1), R ¹ represents an alkyl group having 1 to 20 carbon atoms, m is 1 to 300, and n is 1 to 3.

The preferable lower limit of the content of the moisture resistance improver relative to 100 parts by weight of the polyvinyl acetal is 0.01 part by weight, and the preferable upper limit is 5 parts by weight. When the content of the moisture resistance improver is within this range, the moisture resistance of the interlayer film for laminated glass to be obtained can be further improved. A more preferable upper limit of the content of the moisture resistance improver is 1 part by weight.

The first resin layer preferably further contains an ultraviolet absorber. When the first resin layer contains an ultraviolet absorber, the light resistance of the first resin layer is increased. Note that the first resin layer may not contain an ultraviolet absorber. The preferable upper limit of the content of the ultraviolet absorber in the first resin layer with respect to 100 parts by weight of the polyvinyl acetal is 1 part by weight, the more preferable upper limit is 0.5 parts by weight, and the further preferable upper limit is 0.2 parts by weight. A particularly preferred upper limit is 0.1 parts by weight.

Examples of the ultraviolet absorber include a compound having a malonic ester structure, a compound having an oxalic acid anilide structure, a compound having a benzotriazole structure, a compound having a benzophenone structure, a compound having a triazine structure, a compound having a benzoate structure, and a hindered amine Examples include ultraviolet absorbers such as compounds having a structure.

The first resin layer may contain additives such as an antioxidant, a light stabilizer, an antistatic agent, a blue pigment, a blue dye, a green pigment, and a green dye as necessary.

Since the excellent light resistance can be obtained, the first resin layer preferably contains an antioxidant. The antioxidant is not particularly limited, and examples thereof include an antioxidant having a phenol structure, an antioxidant containing sulfur, and an antioxidant containing phosphorus.
The antioxidant having the phenol structure is an antioxidant having a phenol skeleton. Examples of the antioxidant having the phenol structure include 2,6-di-t-butyl-p-cresol (BHT), butylated hydroxyanisole (BHA), 2,6-di-t-butyl-4- Ethylphenol, 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-t) -Butylphenyl) butane, tetrakis [methylene-3- (3 ', 5'-butyl-4-hydroxyphenyl) propionate] methane, 1,3,3-tris- (2-methyl) 4-hydroxy-5-tert-butylphenol) butane, 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene, and bis ( 3,3′-tert-butylphenol) butyric acid glycol ester, pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] and the like. The said antioxidant may be only 1 type, and may use 2 or more types together.

Although the thickness of the said 1st resin layer is not specifically limited, A preferable minimum is 100 micrometers and a preferable upper limit is 2000 micrometers. When the thickness of the first resin layer is within this range, the penetration resistance of the obtained laminated glass can be further enhanced. A more preferable lower limit of the thickness of the first resin layer is 350 μm, and a more preferable upper limit is 1000 μm.

In the interlayer film for laminated glass of the present invention, the second resin layer may be laminated on one surface of the first resin layer, and the second resin layer is sandwiched between the two first resin layers. A three-layer interlayer film is preferable. The second resin layer preferably contains polyvinyl acetal, and more preferably contains polyvinyl acetal and a plasticizer. In addition to the first and second resin layers, other layers may be laminated. Examples of the other layer include a layer containing a thermoplastic resin such as polyethylene terephthalate and polyvinyl acetal. The other layer may be an ultraviolet blocking layer containing an ultraviolet absorber. As the ultraviolet absorber used for the ultraviolet blocking layer, the ultraviolet absorber used for the first resin layer described above can be used.

As the polyvinyl acetal contained in the second resin layer, the polyvinyl acetal contained in the first resin layer can be used. The polyvinyl acetal contained in the second resin layer and the polyvinyl acetal contained in the first resin layer may be the same or different. The plasticizer contained in the second resin layer may be the same as or different from the plasticizer contained in the first resin layer.

When heat shielding properties are required for the interlayer film for laminated glass of the present invention, a heat ray absorbent may be contained in any one or all of the first and second resin layers. Alternatively, in addition to the first and second resin layers, a heat ray shielding layer containing a heat ray absorbent may be further laminated.

The heat ray absorber is not particularly limited as long as it has the ability to shield infrared rays, but is tin-doped indium oxide (ITO) particles, antimony-doped tin oxide (ATO) particles, aluminum-doped zinc oxide (AZO) particles, indium-doped oxide. At least one selected from the group consisting of zinc (IZO) particles, tin-doped zinc oxide particles, silicon-doped zinc oxide particles, lanthanum hexaboride particles and cerium hexaboride particles is preferred.

The interlayer film for laminated glass of the present invention may further have a sound insulation layer for the purpose of improving the sound insulation performance. Sound insulation may be imparted to any one of the first and second resin layers to form a sound insulation layer. In addition to the first and second resin layers, a sound insulation layer may be further laminated.
Examples of the sound insulation layer include a layer containing 50 to 80 parts by weight of the plasticizer with respect to 100 parts by weight of the polyvinyl acetal. The sound insulation layer preferably contains polyvinyl acetal, and more preferably contains polyvinyl butyral. The polyvinyl acetal contained in the sound insulation layer preferably has a hydroxyl group content in the range of 20 to 28 mol%. The polyvinyl acetal contained in the sound insulation layer is polyvinyl acetal A having an acetyl group amount of 8 to 30 mol%, an acetyl group amount of more than 0 mol% and less than 5 mol%, and an acetalization degree of 70 to 85 mol%. Or polyvinyl acetal C having an acetyl group amount of 5 mol% or more and less than 8 mol% and an acetalization degree of 65 to 80 mol%.

The laminated glass in which the interlayer film for laminated glass of the present invention is laminated between a pair of glass plates is also one aspect of the present invention.
The said glass plate can use the transparent plate glass generally used. Examples thereof include inorganic glass such as float plate glass, polished plate glass, template glass, netted glass, wire-containing plate glass, colored plate glass, heat ray absorbing glass, heat ray reflecting glass, and green glass. Further, an ultraviolet shielding glass having an ultraviolet shielding coating layer formed on the glass surface can also be used. Furthermore, organic plastics plates such as polyethylene terephthalate, polycarbonate, and polyacrylate can also be used.
Two or more types of glass plates may be used as the glass plate. For example, the laminated glass which laminated | stacked the intermediate film for laminated glasses of this invention between transparent float plate glass and colored glass plates like green glass is mentioned. Moreover, you may use the glass plate from which 2 or more types of thickness differs as said glass plate.

ADVANTAGE OF THE INVENTION According to this invention, the intermediate film for laminated glasses which can control adhesiveness and is excellent in moisture resistance can be provided. Moreover, according to this invention, the laminated glass containing this intermediate film for laminated glasses can be provided.

Hereinafter, embodiments of 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) Resin composition forming the first resin layer 40 parts by weight of triethylene glycol di-2-ethylhexanoate (3GO), potassium formate as a potassium salt of a carboxylic acid having 1 to 5 carbon atoms. 045 parts by weight and 0.13 part by weight of a polyoxyethylene lauryl ether phosphate (Daiichi Kogyo Seiyaku Co., Ltd., “Plisurf A208B”) were added as a moisture resistance improver to prepare a plasticizer solution. Polyvinyl butyral obtained by acetalizing polyvinyl alcohol having a polymerization degree of 1700 with n-butyraldehyde (acetyl group content 0.9 mol%, hydroxyl group content 30.6 mol) %, Butyralization degree 68.5 mol%) was sufficiently kneaded with a mixing roll to prepare a resin composition for forming the first resin layer.

(2) Production of interlayer film for laminated glass The resin composition forming the first resin layer was extruded using an extruder to obtain an interlayer film for laminated glass (length 30 cm x width 15 cm). The thickness of the obtained interlayer film for laminated glass (first resin layer) was 760 μm.

(3) Manufacture of laminated glass The obtained interlayer film for laminated glass was laminated between a pair of clear glass (thickness 2.5 mm) measuring 30 cm in length and 15 cm in width to obtain a laminate. The obtained laminate was vacuum-pressed while being held at 90 ° C. for 30 minutes with a vacuum laminator to be pressure-bonded. After the pressure bonding, pressure bonding was performed for 20 minutes using an autoclave under conditions of 140 ° C. and 14 MPa to obtain a laminated glass.

(Examples 2, 3, 6-8, Reference Examples 4 , 5 , 9 , 10 and Comparative Examples 1 and 2)
Except having changed into the composition of Table 1, it carried out similarly to Example 1, and obtained the intermediate film for laminated glasses, and the laminated glass.

(Evaluation)
Each laminated glass obtained in Examples , Reference Examples and Comparative Examples was evaluated by the following method. The results are shown in Table 1.

(1) Adhesiveness (measurement of Pummel value of interlayer film for laminated glass)
The obtained laminated glass was allowed to stand for 16 hours in an environment of −18 ° C. ± 0.6 ° C. The center of this laminated glass (length 150 mm × width 150 mm) was hammered with a head of 0.45 kg. The glass was pulverized until the particle size of the glass became 6 mm or less, and the degree of exposure of the film after the glass partially peeled was measured.

(2) Moisture resistance After the obtained laminated glass was allowed to stand in an environment of 50 ° C. and humidity of 95% RH for 8 weeks, the whitening distance from the central part of each periphery of the laminated glass was measured. Table 1 shows the maximum value of the whitening distance among the whitening distances from the central part of each periphery of the laminated glass.

ADVANTAGE OF THE INVENTION According to this invention, the intermediate film for laminated glasses which can control adhesiveness and is excellent in moisture resistance can be provided. Moreover, according to this invention, the laminated glass containing this intermediate film for laminated glasses can be provided.

Claims (5)

Features and polyvinyl acetal, a plasticizer, and the potassium salts of carboxylic acids having 1 to 5 carbon atoms, including polyoxyethylene alkyl ether phosphoric acid ester as a moisture resistance improver, further comprising a first resin layer An interlayer film for laminated glass. The potassium salt of a carboxylic acid having 1 to 5 carbon atoms is at least one selected from the group consisting of potassium formate, potassium acetate, and potassium propionate. Interlayer film. The interlayer film for laminated glass according to claim 1 or 2, wherein the content of potassium element in the first resin layer is 300 ppm or less. 4. The interlayer film for laminated glass according to claim 1, wherein the first resin layer contains a magnesium element, and the content of the magnesium element is 80 ppm or less. A laminated glass, wherein the interlayer film for laminated glass according to claim 1, 2 or 3 is laminated between a pair of glass plates.