Intermediate film for laminated glass, and laminated glass

Abstract

Provided is an interlayer film for laminated glass which produces a high contrast image under light radiation, is less susceptible to color changes, and allows for control of the adhesion, as well as a laminated glass including the interlayer film. The interlayer film includes a light emitting layer containing a polyvinyl acetal, a light emitting material having a terephthalic acid ester structure, and a potassium salt.

Claims

1. An interlayer film for laminated glass comprising a light emitting layer containing a polyvinyl acetal, a plasticizer, a light emitting material having a terephthalic acid ester structure, a potassium salt, and optionally a magnesium element, wherein: the polyvinyl acetal has 40 to 85 mol % of a degree of acetalization, 15 to 35 mol % of hydroxyl group content and 0.2 to 30 mol % of acetyl group content, the light emitting material having a terephthalic acid ester structure is diethyl-2,5-dihydroxy terephthalate, dimethyl-2,5-dihydroxy terephthalate or diethyl-2,5-diamino terephthalate, the potassium salt is potassium formate, potassium acetate, potassium acetate in combination with potassium 2-ethylhexanoate, or potassium propionate, the potassium element content of the light emitting layer is 50 ppm to 300 ppm, the magnesium element content of the light emitting layer is 40 ppm or less, the light emitting layer comprises 0.001 to 5 parts by weight of light emitting material having a terephthalic acid ester structure for 100 parts by weight of polyvinyl acetal, the light emitting layer comprises 20 to 80 parts by weight of the plasticizer for 100 parts by weight of polyvinyl acetal, the thickness of the light emitting layer is 300 to 2000 μm, and when the interlayer film is inserted between two clear glass plates having a thickness of 2.5 mm, the resulting laminated glass has a yellow index (YI) value which is determined with a spectrophotometer in accordance with JIS Z 8722 of 15 or less.

2. The interlayer film for laminated glass according to claim 1, wherein the thickness of the light emitting layer is 300 to 800 μm.

Description

DESCRIPTION OF EMBODIMENTS

(1) The following examples are offered to demonstrate the present invention, but are not to be construed as limiting the present invention.

Example 1

(2) (1) Resin Composition for Light Emitting Layer

(3) A light-emissive plasticizer solution was prepared by mixing 0.2 parts by weight of diethyl-2,5-dihydroxy terephthalate (“diethyl-2,5-dihydroxyterephthalate” from Aldrich), which corresponds to the compound having a structure represented by the formula (1), as the light emitting material having a terephthalic acid ester structure, and 0.056 parts by weight of potassium acetate as the potassium salt with 40 parts by weight of triethyleneglycol di-2-ethylhexanoate (3GO). The entire amount of the plasticizer solution was combined with 100 parts by weight of polyvinyl butyral (acetyl group content: 0.9 mol %, hydroxyl group content: 30.6 mol %, degree of butyralization: 68.5 mol %) obtained by acetalization of a polyvinyl alcohol (degree of polymerization: 1700) with n-butylaldehyde. The resulting mixture was sufficiently kneaded with mixing rolls. In this manner, a resin composition for a light emitting layer was prepared.

(4) (2) Formation of Interlayer Film for Laminated Glass

(5) An interlayer film for laminated glass (30 cm (length)×15 cm (width)) consisting of a light emitting layer was formed by extrusion of the resin composition for a light emitting layer from an extruder. The thickness of the interlayer film for laminated glass was 800 μm.

(6) (3) Production of Laminated Glass

(7) The interlayer film for laminated glass was inserted between a pair of 30 cm (length)×15 cm (width) clear glass plates (thickness: 2.5 mm) to prepare a laminate. Pressure bonding was carried out by vacuum pressing of the laminate with a vacuum laminator at 90° C. for 30 minutes. After pressure bonding, the laminate was further pressure bonded in an autoclave at 140° C. at 14 MPa for 20 minutes. In this manner, a laminated glass was obtained.

Examples 2 to 19 and Comparative Example 1

(8) An interlayer film for laminated glass and a laminated glass were obtained in the same manner as in Example 1, except that the composition was changed as shown in Tables 1 and 2.

Example 20

(9) (1) Resin Composition for Surface Layer

(10) A light-emissive plasticizer solution was prepared by mixing 0.6 parts by weight of diethyl-2,5-dihydroxy terephthalate (“diethyl-2,5-dihydroxyterephthalate” from Aldrich), which corresponds to the compound having a structure represented by the formula (1), as the light emitting material having a terephthalic acid ester structure, and 0.056 parts by weight of potassium acetate as the potassium salt with 40 parts by weight of triethyleneglycol di-2-ethylhexanoate (3GO). The entire amount of the plasticizer solution was combined with 100 parts by weight of polyvinyl butyral (acetyl group content: 0.9 mol %, hydroxyl group content: 30.6 mol %, degree of butyralization: 68.5 mol %) obtained by acetalization of a polyvinyl alcohol (degree of polymerization: 1700) with n-butylaldehyde. The resulting mixture was sufficiently kneaded with mixing rolls. In this manner, a resin composition for a surface layer was prepared.

(11) (2) Resin Composition for Intermediate Layer

(12) A resin composition for an intermediate layer was prepared by sufficiently kneading 60 parts by weight of triethyleneglycol di-2-ethylhexanoate (3GO) with 100 parts by weight of polyvinyl butyral (acetyl group content: 13 mol %, hydroxyl group content: 22 mol %, degree of butyralization: 65 mol %) obtained by acetalization of a polyvinyl alcohol (degree of polymerization: 2300) with n-butylaldehyde with mixing rolls.

(13) (3) Formation of Interlayer Film for Laminated Glass

(14) The resin composition for a surface layer and the resin composition for an intermediate layer were extruded from a coextruder to form an interlayer film for laminated glass (30 cm (length)×15 cm (width)) including three layers: a surface layer (thickness: 350 μm)/an intermediate layer (thickness: 100 μm)/a surface layer (thickness: 350 μm). The thickness of the interlayer film for laminated glass was 800 μm.

(15) (4) Production of Laminated Glass

(16) The interlayer film for laminated glass was inserted between a pair of 30 cm (length)×15 cm (width) clear glass plates (thickness: 2.5 mm) to prepare a laminate. Pressure bonding was carried out by vacuum pressing of the laminate with a vacuum laminator at 90° C. for 30 minutes. After pressure bonding, the laminate was further pressure bonded in an autoclave at 140° C. at 14 MPa for 20 minutes. In this manner, a laminated glass was obtained.

Examples 21 to 42 and Comparative Examples 2, 3

(17) An interlayer film for laminated glass and a laminated glass were obtained in the same manner as in Example 20, except that the compositions of the surface layers and the intermediate layer were changed as shown in Tables 3 to 7.

(18) (Evaluation)

(19) The laminated glasses obtained in the examples and comparative examples were evaluated as follows. Tables 1 to 7 show the results.

(20) (1) Evaluation of Light Emission

(21) An entire surface of each of the laminated glasses was irradiated with light from a high power xenon light source (“REX-250” from Asahi Spectra Co., Ltd., emission at 405 nm) in a dark room. The laminated glasses were visually observed, and those emitting light from a center portion thereof were given a rating of “O”, and those which did not emit light were given a rating of “x”. The entire surface of each laminated glass was further irradiated in a dark room with light from the high power xenon light source (“REX-250” from Asahi Spectra Co., Ltd., emission at 405 nm) that was spaced 10 cm from the laminated glass surface in the perpendicular direction, and measured for luminance with a luminance meter (“SR-3AR” from TOPCON TECHNOHOUSE CORPORATION) that was positioned on the side being irradiated with light at an angle of 45 degrees with respect to the laminated glass surface being irradiated with light, and spaced a minimum distance of 35 cm from the laminated glass surface.

(22) (2) Evaluation of Color Change

(23) The laminated glasses (5 cm (length)×5 cm (width)) were measured for the yellow index value (YI value) with a spectrophotometer (U-4100 from Hitachi High-Technologies Corporation) in accordance with JIS Z 8722. Their yellow index values (YI values) were evaluated as follows: when the YI value is 0 or more and 20 or less, a rating of “0” was given; and when the YI value is more than 20, a rating of “x” was given.

(24) (3) Evaluation of Adhesion (Measurement of Pummel Value of Interlayer Film for Laminated Glass)

(25) The laminated glasses obtained in the examples and comparative examples were left standing at −18° C.±0.6° C. for 16 hours, and a center portion (150 mm (length)×150 mm (width)) of each laminated glass was shattered with a hammer having a 0.45 kg head into glass pieces with a size of 6 mm or smaller. Areas of the films from which glass pieces fell off were measured for exposure degree, and a pummel value was assigned based on the classifications indicated in Table 8. A pummel value of 2 to 9 was evaluated as “◯”, and a pummel value of 1 or less or of 10 was evaluated as “x”. The pummel values are also shown.

(26) TABLE-US-00001 TABLE 1 Example 1 Example 2 Example 3 Example 4 Example 5 Light Polyvinyl butyral Parts by weight 100 100 100 100 100 emitting layer Degree of polymerization 1700 1700 1700 1700 1700 Hydroxyl group content 30.6 30.6 30.6 30.6 30.6 (mol %) Degree of butyralization 68.5 68.5 68.5 68.5 68.5 (mol %) Acetyl group content 0.9 0.9 0.9 0.9 0.9 (mol %) Plasticizer (3GO) Parts by weight 40 40 40 40 40 Light emitting Diethyl-2,5-dihydroxy Parts by weight 0.2 0.2 0.2 0.2 0.2 material having terephthalate terephthalic acid Dimethyl-2,5-dihydroxy Parts by weight 0 0 0 0 0 ester structure terephthalate Diethyl-2,5-diamino Parts by weight 0 0 0 0 0 terephthalate Potassium salt Potassium acetate Parts by weight 0.056 0.084 0.028 0.042 0.056 Potassium Parts by weight 0 0 0.052 0.078 0 2-ethylhexanoate Potassium formate Parts by weight 0 0 0 0 0 Potassium propionate Parts by weight 0 0 0 0 0 Magnesium salt Magnesium acetate Parts by weight 0 0 0 0 0.049 tetrahydrate Potassium concentration ppm 160 240 160 240 160 Magnesium concentration ppm 0 0 0 0 40 Thickness of light emitting layer μm 800 800 800 800 800 Evaluation Light emission Evaluation ◯ ◯ ◯ ◯ ◯ Luminance (cd/m.sup.2) 750 753 751 755 745 Color change Evaluation ◯ ◯ ◯ ◯ ◯ Initial YI 7 7 7 7 10 Adhesion Evaluation ◯ ◯ ◯ ◯ ◯ Pummel value 4 3 5 4 4 Example 6 Example 7 Example 8 Example 9 Example 10 Light Polyvinyl butyral Parts by weight 100 100 100 100 100 emitting layer Degree of polymerization 1700 1700 1700 1700 1700 Hydroxyl group content 30.6 30.6 30.6 30.6 30.7 (mol %) Degree of butyralization 68.5 68.5 68.5 68.5 68.5 (mol %) Acetyl group content 0.9 0.9 0.9 0.9 0.8 (mol %) Plasticizer (3GO) Parts by weight 40 40 40 40 40 Light emitting Diethyl-2,5-dihydroxy Parts by weight 0.2 0.2 0.2 0.2 0.2 material having terephthalate terephthalic acid Dimethyl-2,5-dihydroxy Parts by weight 0 0 0 0 0 ester structure terephthalate Diethyl-2,5-diamino Parts by weight 0 0 0 0 0 terephthalate Potassium salt Potassium acetate Parts by weight 0.056 0.056 0.018 0.11 0.056 Potassium Parts by weight 0 0 0 0 0 2-ethylhexanoate Potassium formate Parts by weight 0 0 0 0 0 Potassium propionate Parts by weight 0 0 0 0 0 Magnesium salt Magnesium acetate Parts by weight 0.074 0.025 0 0 0 tetrahydrate Potassium concentration ppm 160 160 50 300 160 Magnesium concentration ppm 60 20 0 0 0 Thickness of light emitting layer μm 800 800 800 800 800 Evaluation Light emission Evaluation ◯ ◯ ◯ ◯ ◯ Luminance (cd/m.sup.2) 735 748 750 758 751 Color change Evaluation ◯ ◯ ◯ ◯ ◯ Initial YI 14 8.5 7 7 7 Adhesion Evaluation ◯ ◯ ◯ ◯ ◯ Pummel value 3 4 7 2 4

(27) TABLE-US-00002 TABLE 2 Example Example Example Example 11 12 13 14 Example 15 Light Polyvinyl butyral Parts by weight 100 100 100 100 100 emitting layer Degree of polymerization 1700 1700 1700 1700 1700 Hydroxyl group content 29.9 30.6 30.6 30.6 30.6 (mol %) Degree of butyralization 68.5 68.5 68.5 68.5 68.5 (mol %) Acetyl group content 1.6 0.9 0.9 0.9 0.9 (mol %) Plasticizer (3GO) Parts by weight 40 40 40 40 40 Light emitting Diethyl-2,5-dihydroxy Parts by weight 0.2 0 0 0.2 0.2 material having terephthalate terephthalic acid Dimethyl-2,5-dihydroxy Parts by weight 0 0.2 0.8 0 0 ester structure terephthalate Diethyl-2,5-diamino Parts by weight 0 0 0 0 0 terephthalate Potassium salt Potassium acetate Parts by weight 0.056 0.056 0.056 0 0 Potassium Parts by weight 0 0 0 0 0 2-ethylhexanoate Potassium formate Parts by weight 0 0 0 0.047 0 Potassium propionate Parts by weight 0 0 0 0 0.063 Magnesium salt Magnesium acetate Parts by weight 0 0 0 0 0 tetrahydrate Potassium concentration ppm 160 160 160 160 160 Magnesium concentration ppm 0 0 0 0 0 Thickness of light emitting layer μm 800 800 800 800 800 Evaluation Light emission Evaluation ◯ ◯ ◯ ◯ ◯ Luminance (cd/m.sup.2) 752 756 950 754 759 Color change Evaluation ◯ ◯ ◯ ◯ ◯ Initial YI 7 7 7 7 7 Adhesion Evaluation ◯ ◯ ◯ ◯ ◯ Pummel value 4 4 4 4 4 Example Example Example Example Comparative 16 17 18 19 Example 1 Light Polyvinyl butyral Parts by weight 100 100 100 100 100 emitting layer Degree of polymerization 1700 1700 1700 1700 1700 Hydroxyl group content 30.6 30.6 30.6 30.6 30.6 (mol %) Degree of butyralization 68.5 68.5 68.5 68.5 68.5 (mol %) Acetyl group content 0.9 0.9 0.9 0.9 0.9 (mol %) Plasticizer (3GO) Parts by weight 40 40 40 40 40 Light emitting Diethyl-2,5-dihydroxy Parts by weight 0.5 0.8 0 0 0.2 material having terephthalate terephthalic acid Dimethyl-2,5-dihydroxy Parts by weight 0 0 0 0 0 ester structure terephthalate Diethyl-2,5-diamino Parts by weight 0 0 0.2 0.8 0 terephthalate Potassium salt Potassium acetate Parts by weight 0.056 0.056 0.056 0.056 0 Potassium Parts by weight 0 0 0 0 0 2-ethylhexanoate Potassium formate Parts by weight 0 0 0 0 0 Potassium propionate Parts by weight 0 0 0 0 0 Magnesium salt Magnesium acetate Parts by weight 0 0 0 0 0.11 tetrahydrate Potassium concentration ppm 160 160 160 160 0 Magnesium concentration ppm 0 0 0 0 90 Thickness of light emitting layer μm 800 800 800 800 800 Evaluation Light emission Evaluation ◯ ◯ ◯ ◯ ◯ Luminance (cd/m.sup.2) 920 1000 732 935 725 Color change Evaluation ◯ ◯ ◯ ◯ X Initial YI 7 7 7 7 21 Adhesion Evaluation ◯ ◯ ◯ ◯ ◯ Pummel value 4 4 4 4 4

(28) TABLE-US-00003 TABLE 3 Example Example Example Example 20 21 22 23 Example 24 Intermediate Polyvinyl butyral Parts by weight 100 100 100 100 100 layer Degree of polymerization 2300 2300 2300 2300 2300 Hydroxyl group content 22 22 22 22 22 (mol %) Degree of butyralization 65 65 65 65 65 (mol %) Acetyl group content 13 13 13 13 13 (mol %) Plasticizer (3GO) Parts by weight 60 60 60 60 60 Potassium acetate Parts by weight 0 0 0 0 0 Potassium 2-ethylhexanoate Parts by weight 0 0 0 0 0 Potassium formate Parts by weight 0 0 0 0 0 Potassium propionate Parts by weight 0 0 0 0 0 Magnesium acetate tetrahydrate Parts by weight 0 0 0 0 0 Light emitting Diethyl-2,5-dihydroxy Parts by weight 0 0 0 0 0 material terephthalate having Dimethyl-2,5-dihydroxy Parts by weight 0 0 0 0 0 terephthatlc acid terephthalate ester structure Potassium concentration ppm 0 0 0 0 0 Magnesium concentration ppm 0 0 0 0 0 Thickness of Intermediate layer μm 100 100 100 100 100 Surface layer Polyvinyl butyral Parts by weight 100 100 100 100 100 Degree of polymerization 1700 1700 1700 1700 1700 Hydroxyl group content 30.6 30.6 30.6 30.6 30.6 (mol %) Degree of butyralization 68.6 68.5 68.5 68.5 68.5 (mol %) Acetyl group content 0.8 0.8 0.9 0.9 0.8 (mol %) Plasticizer (3GO) Parts by weight 40 40 40 40 40 Adhesion control Potassium acetate Parts by weight 0.056 0 0 0.056 0.084 agent Potassium 2-ethylhexanoate Parts by weight 0 0 0 0 0 Potassium formate Parts by weight 0 0.047 0 0 0 Potassium propionate Parts by weight 0 0 0.063 0 0 Magnesium acetate Parts by weight 0 0 0 0.049 0 tetrahydrate Light emitting Diethyl-2,5-dihydroxy Parts by weight 0.6 0.6 0.6 0.6 0.6 material having terephthalate terephthalic acid Dimethyl-2,5-dihydroxy Parts by weight 0 0 0 0 0 ester structure terephthalate Potassium concentration ppm 160 160 160 160 240 Magnesium concentration ppm 0 0 0 40 0 Thickness of surface layer μm 350 360 350 350 350 Evaluation Evaluation of light emission Luminance (cd/m.sup.2) 925 923 935 920 940 Evaluation of color change Initial YI 7 7 7 10 7 Evaluation of adhesion Pummel value 4 4 4 4 3

(29) TABLE-US-00004 TABLE 4 Example Example Example Example 25 26 27 28 Example 29 Intermediate Polyvinyl butyral Parts by weight 100 100 100 100 100 layer Degree of polymerization 2300 2300 2300 2300 2300 Hydroxyl group content 22 22 22 22 22 (mol %) Degree of butyralization 65 65 65 65 65 (mol %) Acetyl group content 13 13 13 13 13 (mol %) Plasticizer (3GO) Parts by weight 60 60 60 60 60 Potassium acetate Parts by weight 0 0 0 0 0.028 Potassium 2-ethylhexanoate Parts by weight 0 0 0 0 0 Potassium formate Parts by weight 0 0 0 0 0 Potassium propionate Parts by weight 0 0 0 0 0 Magnesium acetate tetrahydrate Parts by weight 0 0 0 0 0 Light emitting Diethyl-2,5-dihydroxy Parts by weight 0 0 0.5 0.5 0.5 material having terephthalate terephthelic acid Dimethyl-2,5-dihydroxy Parts by weight 0 0 0 0 0 ester structure terephthalate Potassium concentration ppm 0 0 0 0 80 Magnesium concentration ppm 0 0 0 0 0 Thickness of Intermediate layer μm 100 100 100 100 100 Surface layer Polyvinyl butyral Parts by weight 100 100 100 100 100 Degree of polymerization 1700 1700 1700 1700 1700 Hydroxyl group content 30.6 30.6 30.6 30.6 30.6 (mol %) Degree of butyralization 68.5 68.5 68.5 68.5 68.5 (mol %) Acetyl group content 0.9 0.9 0.9 0.9 0.9 (mol %) Plasticizer (3GO) Parts by weight 40 40 40 40 40 Adhesion control Potassium acetate Parts by weight 0.084 0.056 0.056 0.056 0.056 agent Potassium 2-ethylhexanoate Parts by weight 0 0 0 0 0 Potassium formate Parts by weight 0 0 0 0 0 Potassium propionate Parts by weight 0 0 0 0 0 Magnesium acetate Parts by weight 0 0 0 0.049 0 tetrahydrate Light emitting Diethyl-2,5-dihydroxy Parts by weight 0.8 0 0.5 0.5 0.5 material having terephthalate terephthalic acid Dimethyl-2,5-dihydroxy Parts by weight 0 0.6 0 0 0 ester structure terephthalate Potassium concentration ppm 240 160 160 160 160 Magnesium concentration ppm 0 0 0 40 0 Thickness of surface layer μm 350 350 350 350 350 Evaluation Evaluation of light emission Luminance (cd/m.sup.2) 970 920 920 923 921 Evaluation of color change Initial YI 8 7 7 10 7 Evaluation of adhesion Pummel value 3 4 4 4 4

(30) TABLE-US-00005 TABLE 5 Example Example Example Example 30 31 32 33 Example 34 Intermediate Polyvinyl butyral Parts by weight 100 100 100 100 100 layer Degree of polymerization 2300 2300 2300 2300 2300 Hydroxyl group content 22 16 24 22 22 (mol %) Degree of butyralization 65 71 60 65 65 (mol %) Acetyl group content 13 13 16 13 13 (mol %) Plasticizer (3GO) Parts by weight 60 60 60 60 60 Potassium acetate Parts by weight 0 0 0 0 0 Potassium 2-ethylhexanoate Parts by weight 0 0 0 0 0 Potassium formate Parts by weight 0 0 0 0 0 Potassium propionate Parts by weight 0 0 0 0 0 Magnesium acetate tetrahydrate Parts by weight 0.049 0 0 0 0 Light emitting Diethyl-2,5-dihydroxy Parts by weight 0.5 0 0 0 0 material having terephthalate terephthalic acid Dimethyl-2,5-dihydroxy Parts by weight 0 0 0 0 0 ester structure terephthalate Potassium concentration ppm 0 0 0 0 0 Magnesium concentration ppm 40 0 0 0 0 Thickness of Intermediate layer μm 100 100 100 100 100 Surface layer Polyvinyl butyral Parts by weight 100 100 100 100 100 Degree of polymerization 1700 1700 1700 1700 1700 Hydroxyl group content 30.6 30.6 30.6 30.7 30.1 (mol %) Degree of butyralization 68.5 68.5 68.5 68.5 68.3 (mol %) Acetyl group content 0.9 0.9 0.9 0.8 1.6 (mol %) Plasticizer (3GO) Parts by weight 40 40 40 40 40 Adhesion control Potassium acetate Parts by weight 0.056 0.056 0.056 0.056 0.056 agent Potassium 2-ethylhexanoate Parts by weight 0 0 0 0 0 Potassium formate Parts by weight 0 0 0 0 0 Potassium propionate Parts by weight 0 0 0 0 0 Magnesium acetate Parts by weight 0 0 0.049 0 0.049 tetrahydrate Light emitting Diethyl-2,5-dihydroxy Parts by weight 0.5 0.6 0.6 0.6 0.6 material having terephthalate terephthalic acid Dimethyl-2,5-dihydroxy Parts by weight 0 0 0 0 0 ester structure terephthalate Potassium concentration ppm 160 160 160 160 160 Magnesium concentration ppm 0 0 40 0 40 Thickness of surface layer μm 350 350 350 350 350 Evaluation Evaluation of light emission Luminance (cd/m.sup.2) 918 927 921 920 918 Evaluation of color change Initial YI 10 7 10 7 10 Evaluation of adhesion Pummel value 4 4 4 4 4

(31) TABLE-US-00006 TABLE 6 Example Example Example Example 35 36 37 38 Example 39 Intermediate Polyvinyl butyral Parts by weight 100 100 100 100 100 layer Degree of polymerization 2300 2300 2300 1700 3000 Hydroxyl group content 22 22 22 30.6 22 (mol %) Degree of butyralization 65 65 65 68.5 65 (mol %) Acetyl group content 13 13 13 0.9 13 (mol %) Plasticizer (3GO) Parts by weight 70 50 45 40 60 Potassium acetate Parts by weight 0 0 0 0 0 Potassium 2-ethylhexanoate Parts by weight 0 0 0 0 0 Potassium formate Parts by weight 0 0 0 0 0 Potassium propionate Parts by weight 0 0 0 0 0 Magnesium acetate tetrahydrate Parts by weight 0 0 0 0 0 Light emitting Diethyl-2,5-dihydroxy Parts by weight 0 0 0 0 0 material having terephthalate terephthalic acid Dimethyl-2,5-dihydroxy Parts by weight 0 0 0 0 0 ester structure terephthalate Potassium concentration ppm 0 0 0 0 0 Magnesium concentration ppm 0 0 0 0 0 Thickness of intermediate layer μm 100 100 100 100 100 Surface layer Polyvinyl butyral Parts by weight 100 100 100 100 100 Degree of polymerization 1700 1700 1700 1700 1700 Hydroxyl group content 30.6 30.6 30.6 30.6 30.6 (mol %) Degree of butyralization 68.5 68.5 68.5 68.5 68.5 (mol %) Acetyl group content 0.9 0.9 0.9 0.9 0.9 (mol %) Plasticizer (3GO) Parts by weight 40 40 40 40 40 Adhesion control Potassium acetate Parts by weight 0.056 0.056 0.056 0.056 0 agent Potassium 2-ethylhexanoate Parts by weight 0 0 0 0 0 Potassium formate Parts by weight 0 0 0 0 0.047 Potassium propionate Parts by weight 0 0 0 0 0 Magnesium acetate Parts by weight 0 0 0 0 0 tetrahydrate Light emitting Diethyl-2,5-dihydroxy Parts by weight 0.6 0.6 0.6 0.6 0.6 material having terephthalate terephthalic acid Dimethyl-2,5-dihydroxy Parts by weight 0 0 0 0 0 ester structure terephthalate Potassium concentration ppm 160 160 160 160 160 Magnesium concentration ppm 0 0 0 0 0 Thickness of surface layer μm 350 350 350 350 350 Evaluation Evaluation of light emission Luminance (cd/m.sup.2) 928 926 929 922 928 Evaluation of color change Initial YI 7 7 7 7 7 Evaluation of adhesion Pummel value 4 4 4 4 4

(32) TABLE-US-00007 TABLE 7 Example Example Example Comparative Comparative 40 41 42 Example 2 Example 3 Intermediate Polyvinyl butyral Parts by weight 100 100 100 100 100 layer Degree of polymerization 3000 3000 3000 2300 2300 Hydroxyl group content 22 22 22 22 22 (mol %) Degree of butyralization 65 65 65 65 65 (mol %) Acetyl group content 13 13 13 13 13 (mol %) Plasticizer (3GO) Parts by weight 60 60 60 60 60 Potassium acetate Parts by weight 0 0 0 0 0 Potassium 2-ethylhexanoate Parts by weight 0 0 0 0 0 Potassium formate Parts by weight 0 0 0 0 0 Potassium propionate Parts by weight 0 0 0 0 0 Magnesium acetate tetrahydrate Parts by weight 0 0 0 0 0.11 Light emitting Diethyl-2,5-dihydroxy Parts by weight 0 0 0 0 0.5 material having terephthalate terephthalic acid Dimethyl-2,5-dihydroxy Parts by weight 0 0 0 0 0 ester structure terephthalate Potassium concentration ppm 0 0 0 0 0 Magnesium concentration ppm 0 0 0 0 90 Thickness of Intermediate layer μm 100 100 100 100 100 Surface layer Polyvinyl butyral Parts by weight 100 100 100 100 100 Degree of polymerization 1700 1700 1700 1700 1700 Hydroxyl group content 30.6 30.6 30.6 30.6 30.6 (mol %) Degree of butyralization 68.5 68.5 68.5 68.5 68.5 (mol %) Acetyl group content 0.9 0.9 0.9 0.9 0.9 (mol %) Plasticizer (3GO) Parts by weight 40 40 40 40 40 Adhesion control Potassium acetate Parts by weight 0 0.056 0.056 0 0 agent Potassium Parts by weight 0 0 0 0 0 2-ethylhexanoate Potassium formate Parts by weight 0 0 0 0 0 Potassium propionate Parts by weight 0.063 0 0 0 0 Magnesium acetate Parts by weight 0 0 0 0.11 0.11 tetrahydrate Light emitting Diethyl-2,5-dihydroxy Parts by weight 0.6 0 0.6 0.6 0.5 material having terephthalate terephthalic acid Dimethyl-2,5-dihydroxy Parts by weight 0 0.6 0 0 0 ester structure terephthalate Potassium concentration ppm 160 160 160 0 0 Magnesium concentration ppm 0 0 0 90 90 Thickness of surface layer μm 350 350 350 350 350 Evaluation Evaluation of light emission Luminance (cd/m.sup.2) 929 921 920 910 912 Evaluation of color change Initial YI 7 7 7 30 35 Evaluation of adhesion Pummel value 4 4 4 4 4

(33) TABLE-US-00008 TABLE 8 Exposure degree of interlayer film (area %) Pummel value 90 < Exposure degree ≤ 100 0 85 < Exposure degree ≤ 90 1 60 < Exposure degree ≤ 85 2 40 < Exposure degree ≤ 60 3 20 < Exposure degree ≤ 40 4 10 < Exposure degree ≤ 20 5  5 < Exposure degree ≤ 10 6  2 < Exposure degree ≤ 5 7 Exposure degree ≤ 2 8

INDUSTRIAL APPLICABILITY

(34) The present invention provides an interlayer film for laminated glass which produces a high contrast image under light radiation, is less susceptible to color changes, and allows for control of the adhesion. The present invention further provides a laminated glass including the interlayer film for laminated glass.