Laminated glass intermediate film and laminated glass

Abstract

The present invention aims to provide an interlayer film for a laminated glass which can be stored in a stacked state without experiencing autohesion so as to be easily peelable, and a laminated glass including the interlayer film for a laminated glass. The present invention relates to an interlayer film for a laminated glass, having a large number of recesses and a large number of projections on a first surface and a second surface opposite to the first surface, the recesses on the first surface and the second surface each having a groove shape with a continuous bottom and being regularly adjacent and parallel to each other, the interlayer film for a laminated glass satisfying Formulae (1) and (2):
θ≥10°  (1),
R/Sm≤0.3  (2),
the θ representing an intersection angle of the recesses each having a groove shape with a continuous bottom on the first surface and the recesses each having a groove shape with a continuous bottom on the second surface, the Sm representing the average of Sm1 (μm) and Sm2 (μm), the Sm1 representing an interval between the recesses each having a groove shape with a continuous bottom on the first surface, the Sm2 representing an interval between the recesses each having a groove shape with a continuous bottom on the second surface, the R representing the average of R1 (μm) and R2 (μm), the R1 representing the radius of rotation of the projections on the first surface, the R2 representing the radius of rotation of the projections on the second surface.

Claims

1. An interlayer film for a laminated glass, having recesses and projections on a first surface and a second surface opposite to the first surface, the recesses on the first surface each having a groove shape with a continuous bottom and being regularly adjacent and parallel to each other, the recesses on the second surface each having a groove shape with a continuous bottom and being regularly adjacent and parallel to each other, the interlayer film for a laminated glass satisfying Formulae (1), (2), (3), (5) and (6):
θ≥10°  (1),
0.09≤R/Sm≤0.3  (2),
Rz≥1  (3),
0.08≤R1/Sm1≤0.3  (5), and
0.09≤R2/Sm2≤0.3  (6), the θ representing an intersection angle of the recesses each having a groove shape with a continuous bottom on the first surface and the recesses each having a groove shape with a continuous bottom on the second surface, the Sm representing the average of Sm1 (μm) and Sm2 (μm), the Sm1 representing an interval between the recesses each having a groove shape with a continuous bottom on the first surface, the Sm2 representing an interval between the recesses each having a groove shape with a continuous bottom on the second surface, the R representing the average of R1 (μm) and R2 (μm), the R1 representing the radius of rotation of the projections on the first surface, the R2 representing the radius of rotation of the projections on the second surface, wherein the R1 is 18 to 100 μm, and the R2 is 18 to 100 μm, the Rz representing the average of Rz1 (μm) representing a roughness of tip portions of the projections on the first surface and Rz2 (μm) representing a roughness of tip portions of the projections on the second surface, wherein the roughness of the tip portions of the projections is defined in accordance with the ten-point roughness of JIS B 0601 (1994), and wherein the roughness of the tip portions of the projections is measured over a length of 2.5 mm along a direction parallel to a direction in which apex portions of the projections are continuous, measurements are obtained at 10 sites on the apex portions of the projections to obtain 10 values, and an average of the 10 obtained values is the roughness of the tip portions of the projections.

2. The interlayer film for a laminated glass according to claim 1, wherein the intersection angle θ and the Sm representing the average of the Sm1 and Sm2 satisfy Formula (4):
(1000/Sm).sup.2×Sin θ≥2.2  (4).

3. The interlayer film for a laminated glass according to claim 1, wherein the intersection angle θ is less than 90°.

4. The interlayer film for a laminated glass according to claim 1, wherein the Sm representing the average of the Sm1 and Sm2 is 200 μm or less.

5. A laminated glass comprising: a pair of glass plates; and the interlayer film for a laminated glass according to claim 1 interposed between the pair of glass plates.

6. The interlayer film for a laminated glass according to claim 1, wherein the projections have a planar apex.

7. The interlayer film for a laminated glass according to claim 1, wherein the recesses each having a groove shape with a continuous bottom are regularly adjacent and parallel to each other not at equal intervals.

8. The interlayer film for a laminated glass according to claim 1, wherein the intersection angle θ is 45° or more.

9. The interlayer film for a laminated glass according to claim 1, wherein the intersection angle θ is 45° or more and less than 90°.

10. The interlayer film for a laminated glass according to claim 1, wherein the recesses and projections on the first surface and the second surface opposite to the first surface are not provided in a grid.

11. The interlayer film for a laminated glass according to claim 1, wherein a roughness of the first surface and/or the second surface is 10 to 60 μm.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a view schematically illustrating an exemplary interlayer film for a laminated glass in which recesses each having a groove shape with a continuous bottom are regularly adjacent and parallel to each other at equal intervals on a surface.

(2) FIG. 2 is a view schematically illustrating an exemplary interlayer film for a laminated glass in which recesses each having a groove shape with a continuous bottom are regularly adjacent and parallel to each other at equal intervals on a surface.

(3) FIG. 3 is a view schematically illustrating an exemplary interlayer film for a laminated glass in which recesses each having a groove shape with a continuous bottom are regularly adjacent and parallel to each other not at equal intervals.

(4) FIG. 4 is a view schematically explaining an intersection angle θ.

(5) FIG. 5 is a view schematically explaining an interval Sm of recesses and a radius of rotation R of projections.

DESCRIPTION OF EMBODIMENTS

(6) Embodiments of the present invention are more specifically described in the following with reference to, but not limited to, examples.

Example 1

(7) (1) Preparation of a Resin Composition

(8) Polyvinyl alcohol having an average degree of polymerization of 1700 was acetalized with n-butyraldehyde to give polyvinyl butyral (acetyl group content: 0.9 mol %, butyral group content: 69 mol %, hydroxy group content: 30 mol %). To 100 parts by mass of the polyvinyl butyral was added 40 parts by mass of triethylene glycol-di-2-ethylhexanoate (3GO) as a plasticizer, and kneaded well with a mixing roll to give a resin composition.

(9) (2) Production of an Interlayer Film for a Laminated Glass

(10) The obtained resin composition was extruded using an extruder to provide an interlayer film for a laminated glass having a thickness of 760 μm.

(11) (3) Formation of Projections and Recesses

(12) In the first step, a random pattern of projections and recesses was transferred to both surfaces of the interlayer film for a laminated glass by the following procedure. A pair of rolls in the same shape having a coarse main emboss pattern and a fine sub-emboss pattern was prepared by forming random projections and recesses on the surfaces of iron rolls with an abrasive material, performing vertical grinding thereon, and further forming finer projections and recesses on planar portions after the grinding with a finer abrasive material.

(13) Using the pair of rolls as a device for transferring a pattern of projections and recesses, a random pattern of projections and recesses was transferred to both surfaces of the obtained interlayer film for a laminated glass. The transferring conditions employed here were a temperature of the interlayer film for a laminated glass of 80° C., a temperature of the rolls of 145° C., a linear velocity of 10 m/min, and a linear pressure of 0 to 200 kN/m.

(14) In the second step, projections and recesses in a pattern of grooves each with a continuous bottom were formed by the following procedure. A pair of rolls including a metal roll having a surface milled with a triangular oblique line-type mill and a rubber roll having a JIS hardness of 45 to 75 was used as a device for transferring a pattern of projections and recesses. The interlayer film for a laminated glass having a random pattern of projections and recesses transferred in the first step was passed through the device for transferring a pattern of projections and recesses, thereby forming projections and recesses in which recesses each having a groove shape with a continuous bottom were regularly adjacent and parallel to each other at equal intervals on a first surface. The transferring conditions employed here were a temperature of the interlayer film for a laminated glass of 80° C., a temperature of the rolls of 140° C., a linear velocity of 10 m/min, and a linear pressure of 5 to 100 kN/m.

(15) Then, the same operations were performed on a second surface of the interlayer film for a laminated glass to form recesses each having a groove shape with a continuous bottom. At that time, the intersection angle between the recesses each having a groove shape with a continuous bottom on the first surface and the recesses each having a groove shape with a continuous bottom on the second surface was set to 20°.

(16) (4) Analysis of Projections and Recesses on First Surface and Second Surface

(17) The first surface and the second surface of the obtained interlayer film for a laminated glass were observed (observation range: 20 mm×20 mm) using an optical microscope (BS-8000III produced by SONIC) to measure the interval between the adjacent recesses. The average of the shortest distance between the deepest bottoms of the adjacent recesses was calculated, and the interval Sm1 between the recesses on the first surface and the interval Sm2 between the recesses on the second surface were each 390 μm.

(18) The interlayer film for a laminated glass was cut with a single-edged razor (FAS-10 produced by FEATHER Safety Razor Co., Ltd.) in a direction perpendicular to the direction of the engraved lines of the recesses and parallel to the thickness direction of the film in such a manner that the cut plane was not deformed. Specifically, the razor was not slid in the direction perpendicular to the recesses but pressed in the direction parallel to the thickness direction. The cross section was observed using a microscope (“DSX-100” produced by Olympus Corporation). The cross section was photographed at a magnification of 277 times. The obtained image was enlarged to 50 μm/20 mm for analysis using measurement software included in accessory software. The radius of an inscribed circle at the apex of the projection was determined as the radius of rotation of the tip portion of the projection. According to this method, the radius of rotation R1 of the projections on the first surface and the radius of rotation R2 of the projections on the second surface were measured, and were each 37 μm. The measurement was performed at 23° C. and 30 RH %.

(19) The roughness Rz of the first surface and the second surface was measured perpendicularly so as to transverse the direction in which the recess in an engraved line direction is continuous in conformity with JIS B-0601 (2001). The measurement device may be, for example, “Surfcorder SE300” available from Kosaka Laboratory Ltd. The measurement was performed at a cut-off value of 2.5 mm, a standard length of 2.5 mm, a measurement length of 12.5 mm, a spare length of 2.5 mm, and a stylus feed rate of 0.5 mm/sec. The stylus used had a tip radius of 2 μm and a tip angle of 60°. The measurement was performed at 23° C. and 30 RH %. The interlayer film was allowed to stand in an environment of the measurement conditions for three hours or longer before the measurement.

(20) (5) Measurement of Roughness Rz of Tip Portions of Projections

(21) The roughness Rz1 of the tip portions of the projections on the first surface and the roughness Rz2 of the tip portions of the projections on the second surface were measured as a ten-point average roughness defined in JIS B 0601 (1994) by the following procedure using a three-dimensional profilometer (e.g., “KS-1100” produced by KEYENCE CORPORATION, head: model “LT-9510VM”) and “KS-measure”, measurement software included therewith.

(22) The roughness of the surface of the interlayer film for a laminated glass was measured in a visual field of 2 cm×2 cm, and the roughness of a length of 2.5 mm along the direction parallel to the direction in which the apex portions of the projections are continuous was measured at 10 sites on the apex portions of the projections in the obtained data. The average of 10 obtained values was taken as the roughness of the tip portions of the projections. When 10 sites of the roughness of a length of 2.5 mm were determined, the lines of the 2.5-mm length were set to be apart from each other by 50 μm or more. The roughness of a length of 2.5 mm herein refers to “Rz” resulting from the roughness profile data that is obtained as follows. “KS-Analyzer Ver. 2.00”, analysis software included with the profilometer, was used in the line roughness measurement mode with a length condition set at “2500 μm”. The area of interest was selected in the obtained three-dimensional image data, and the roughness profile data of the area was obtained. The roughness profile data was obtained at a cut-off value of 2.5 mm. Height smoothing and tilt correction were not performed. The measurement conditions other than the visual field were as follows: stage feed condition: continuous; scan direction: bi-directional scanning; leading axis: X-axis; stage travel rate: 250.0 μm/s; and axis feed rate: 10000.0 μm/s. The measuring pitch of the X-axis was set at 2.0 μm, and that of the Y-axis was set at 2.0 μm.

(23) In a case where the highest point of the projection was positioned at the center point of the shortest straight line connecting the deepest bottoms of two adjacent recesses present in the visual field of 2 cm×2 cm, the “apex portion” of the projection in the measurement of the roughness of the tip portions was determined to refer to a range corresponding to 10% of the length of the shortest straight line, centered on the center point of the shortest straight line connecting the deepest bottoms of two adjacent recesses. In a case where the highest point of the projection was not positioned at the center point of the shortest straight line connecting the deepest bottoms, the “apex portion” of the projection was determined to refer to a range corresponding to 10% of the length of the shortest straight line, centered on the point at which the projection was highest on the shortest straight line connecting the deepest bottoms of two adjacent recesses. The measurement was performed at 23° C. and 30 RH %.

Examples 2 to 25, Comparative Examples 1 TO 10

(24) The interlayer film for a laminated glass was produced as in Example 1, except that the acetyl group content, butyral group content, and hydroxy group content of the polyvinyl butyral, and the plasticizer content were changed as shown in Tables 1, 2, and 3, and that the intervals Sm1 and Sm2 between the recesses on the first surface and the second surface, respectively, and the radii of rotation R1 and R2 of the projections on the first surface and the second surface, respectively, the roughness Rz1 and Rz2 of the tip portions of the projections on the first surface and the second surface, respectively, and the surface roughness Rz were changed as shown in Tables 1, 2, and 3.

Example 26

(25) (Preparation of a Resin Composition for Protective Layers)

(26) Polyvinyl alcohol having an average degree of polymerization of 1700 was acetalized with n-butyraldehyde to give polyvinyl butyral (acetyl group content: 1 mol %, butyral group content: 69 mol %, hydroxy group content: 30 mol %). To 100 parts by mass of the polyvinyl butyral were added 36 parts by mass of triethylene glycol-di-2-ethylhexanoate (3GO) as a plasticizer, and kneaded well with a mixing roll to give a resin composition for protective layers.

(27) (Preparation of a Resin Composition for Sound Insulation Layers)

(28) Polyvinyl alcohol having an average degree of polymerization of 2300 was acetalized with n-butyraldehyde to give polyvinyl butyral (acetyl group content: 12.5 mol %, butyral group content: 64 mol %, hydroxy group content: 23.5 mol %). To 100 parts by mass of the polyvinyl butyral was added 76.5 parts by mass of triethylene glycol-di-2-ethylhexanoate (3GO) as a plasticizer, and kneaded well with a mixing roll to give a resin composition for sound insulation layers.

(29) (Production of an Interlayer Film for a Laminated Glass)

(30) The resin composition for sound insulation layers and the resin composition for protective layers were co-extruded to form an interlayer film for a laminated glass (width: 100 cm) having a triple layer structure including a protective layer (thickness: 350 μm), a sound insulation layer (thickness: 100 μm), and a protective layer (thickness: 350 μm) stacked in the stated order in the thickness direction.

(31) (Formation of Projections and Recesses)

(32) In the first step, a random pattern of projections and recesses was transferred to both surfaces of the resulting interlayer film for a laminated glass by the following procedure. A pair of rolls in the same shape having a coarse main emboss pattern and a fine sub-emboss pattern was obtained by forming random projections and recesses on the surfaces of iron rolls with an abrasive material, performing vertical grinding thereon, and further forming finer projections and recesses on planar portions after the grinding.

(33) The pair of rolls was used as a device for transferring a pattern of projections and recesses, and a random pattern of projections and recesses was transferred to both surfaces of the obtained interlayer film for a laminated glass. The transferring conditions employed here were a temperature of the interlayer film for a laminated glass of 80° C., a temperature of the rolls of 145° C., a linear velocity of 10 m/min, and a linear pressure of 0 to 200 kN/m.

(34) In the second step, projections and recesses in a pattern of grooves each with a continuous bottom were formed by the following procedure. A pair of rolls including a metal roll having a surface milled with a triangular oblique line-type mill and a rubber roll having a JIS hardness of 45 to 75 was used as a device for transferring a pattern of projections and recesses. The interlayer film for a laminated glass on which the random pattern of projections and recesses was formed in the first step was passed through the device for transferring a pattern of projections and recesses, thereby forming projections and recesses in which the recesses each having a groove shape with a continuous bottom were formed parallel to each other at equal intervals on a first surface of the interlayer film for a laminated glass. The transferring conditions employed here were a temperature of the interlayer film for a laminated glass of 80° C., a temperature of the rolls of 140° C., a linear velocity of 10 m/min, and a linear pressure of 5 to 100 kN/m.

(35) Next, the recesses each having a groove shape with a continuous bottom were also formed on a second surface of the interlayer film for a laminated glass by the same operation. At that time, the intersection angle between the recesses each having a groove shape with a continuous bottom (shape of an engraved line) on the first surface and the recesses each having a groove shape with a continuous bottom (shape of an engraved line) on the second surface was set to 20°.

(36) The intervals Sm1 and Sm2 of the recesses on the first surface and the second surface, respectively, the radii of rotation R1 and R2 of the projections on the first surface and the second surface, respectively, the roughnesses Rz1 and Rz2 of the tip portions of the projections on the first surface and the second surface, respectively, and the surface roughness Rz were measured as in Example 1.

(37) (Measurement of Plasticizer Content)

(38) A laminated glass after the production was allowed to stand at a temperature of 25° C. and a humidity of 30% for 4 weeks. Then, the laminated glass was cooled in liquid nitrogen to separate the glass plate from the interlayer film for a laminated glass. The resulting protective layers and sound insulation layer were cut in the thickness direction, and allowed to stand at a temperature of 25° C. and a humidity of 30% for 2 hours. The protective layer was peeled from the sound insulation layer using a finger or a device inserted between the protective layer and the sound insulation layer at a temperature of 25° C. and a humidity of 30%, thereby preparing 10 g of a rectangular sample for measurement of each of the protective layer and sound insulation layer. The plasticizer in the sample for measurement was extracted in diethyl ether using a Soxhlet extractor for 12 hours, and the amount of the plasticizer in the sample for measurement was determined, thereby obtaining the plasticizer contents of the protective layer and the intermediate layer.

Examples 27 TO 34, Comparative Examples 11 AND 12

(39) An interlayer film for a laminated glass was produced as in Example 26, except that the acetyl group content, butyral group content, and hydroxy group content of the polyvinyl butyral used were changed as shown in Table 4, and that the intervals Sm1 and Sm2 of the recesses on the first surface and the second surface, respectively, the radii of rotation R1 and R2 of the projections on the first surface and the second surface, respectively, and the roughnesses Rz1 and Rz2 of the tip portions of the projections on the first surface and the second surface, respectively, and the surface roughness Rz were changed as shown in Table 4.

(40) (Evaluation)

(41) The autohesion force of each of the interlayer films for a laminated glass obtained in the examples and the comparative examples was evaluated. Tables 1, 2, 3, and 4 show the results.

(42) The interlayer films for a laminated glass obtained in the examples and the comparative examples were each cut to a size of 150 mm in length and 150 mm in width as a test sample. Two sheets of the obtained test samples were stacked, and a glass plate (weight: 5.8 kg) was placed thereon with release paper interposed therebetween as a release treatment. The release paper was prepared by coating paper, as a base, with silicone. The resulting stack was left as it was in a constant temperature and humidity chamber at a temperature of 30° C. and a humidity of 30% for 48 hours. Then, end portions (2 cm) of the two test samples were peeled and each were fixed using a gripper (width: 15 cm). The 180° peeling strength between the two test samples was measured at a peel rate of 50 cm/min, a temperature of 23° C., and a humidity of 30%. The average (N/15 cm) of the peeling strength within a peeling distance range of 50 mm to 200 mm was calculated. The conditions other than the above conditions were set in conformity with JIS K-6854-3 (1994). The obtained value was taken as the autohesion force of the interlayer film for a laminated glass.

(43) For enabling peeling of the interlayer film for a laminated glass by humans or a device for carrying the film, the autohesion force is preferably 25 N/15 cm or less, more preferably 20 N/15 cm or less, still more preferably 13 N/15 cm or less, particularly preferably 8 N/15 cm or less.

(44) TABLE-US-00001 TABLE 1 Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- ple 1 ple 2 ple 3 ple 4 ple 5 ple 6 ple 7 ple 8 ple 9 ple 10 ple 11 ple 12 ple 13 Compo- Bu degree 69 69 69 69 69 69 69 69 69 69 69 69 69 sition (mol %) OH degree 30 30 30 30 30 30 30 30 30 30 30 30 30 (mol %) Ac degree 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 (mol %) Parts of 40 40 40 40 40 40 40 40 40 40 40 40 40 plasticizer (phr) Projec- Sm1 (μm) 390 190 190 195 290 290 395 270 195 198 185 290 290 tions and R1 (μm) 37 22 55 30 32 31 36 32 55 28 28 30 30 recesses Roughness 1.8 1 1.1 1.2 2 16 14 2 1 1.5 1.3 1.4 1.2 on first Rz1of tip surface portion of projection (μm) R1/Sm1 0.09 0.12 0.29 0.15 0.11 0.11 0.09 0.12 0.28 0.14 0.15 0.10 0.10 Roughness 45 40 48 45 46 55 44 38 48 39 34 38 37 Rz of first surface (μm) Projec- Sm2 (μm) 390 190 195 195 290 285 385 270 195 198 185 285 294 tions and R2 (μm) 37 21 50 30 32 35 40 32 52 26 24 29 27 recesses Roughness 1.8 1 1.3 1.2 2 15 15 2 1.5 1.5 1.3 1.5 1.1 on second Rz2 of tip surface portion of projection (μm) R2/Sm2 0.09 0.11 0.26 0.15 0.11 0.12 0.10 0.12 0.27 0.13 0.13 0.10 0.09 Roughness 46 43 48 48 46 56 43 39 48 37 36 42 38 Rz of second surface (μm) Intersection angle θ 20 10 20 90 20 20 20 10 75 30 20 30 60 R/Sm 0.09 0.11 0.27 0.15 0.11 0.11 0.10 0.12 0.27 0.14 0.14 0.10 0.10 (1000/Sm).sup.2 × Sin θ 2.25 4.81 9.23 26.30 4.07 4.14 2.25 2.38 25.40 12.75 9.99 6.05 10.16 Autohesion force 19.8 15.1 18.0 3.2 15.4 7.2 11.5 23.0 5.8 11.3 13.8 13.9 8.2 (N/15 cm)

(45) TABLE-US-00002 TABLE 2 Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- ple 14 ple 15 ple 16 ple 17 ple 18 ple 19 ple 20 ple 21 ple 22 ple 23 ple 24 ple 25 Compo- Bu degree (mol %) 69 69 69 69 69 69 69 69 69 69 70 68 sition OH degree (mol %) 30 30 30 30 30 30 30 30 30 30 29 31 Ac degree (mol %) 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 1.1 0.8 Parts of plasticizer 40 40 40 40 40 40 40 40 40 40 41 39 (phr) Projec- Sm1 (μm) 220 218 398 210 200 198 280 310 310 198 195 190 tions and R1 (μm) 20 18 38 55 55 55 32 30 33 18 56 53 recesses Roughness Rz1of tip 1.1 1.5 2 1.5 10 13 21 23 23 19 1.3 1 on first portion of projection surface (μm) R1/Sm1 0.09 0.08 0.10 0.26 0.28 0.28 0.11 0.10 0.11 0.09 0.29 0.28 Roughness Rz of first 39 48 56 38 45 45 38 37 44 50 45 54 surface (μm) Projec- Sm2 (μm) 202 203 385 198 198 185 270 285 285 203 195 195 tions and R2 (μm) 20 18 38 54 58 52 33 27 33 18 48 53 recesses Roughness Rz2 of tip 1.1 1.2 1.6 1.5 8 13.5 20.5 28 28 18 1.5 1.5 on second portion of projection surface (μm) R2/Sm2 0.10 0.09 0.10 0.27 0.29 0.28 0.12 0.09 0.12 0.09 0.25 0.27 Roughness Rz of 36 52 52 38 45 48 39 38 43 52 52 50 second surface (μm) Intersection angle θ 90 90 20 90 90 20 10 60 75 90 20 20 R/Sm 0.09 0.09 0.10 0.27 0.28 0.28 0.12 0.10 0.11 0.09 0.27 0.28 (1000/Sm).sup.2 × Sin θ 22.46 22.57 2.23 24.03 25.25 9.33 2.30 9.78 10.91 24.88 8.99 9.23 Autohesion force (N/15 cm) 5.1 4.2 22.1 12.8 10.1 7.5 6.8 6.5 5.8 3.8 20.0 16.2

(46) TABLE-US-00003 TABLE 3 Compar- Compar- Compar- Compar- Compar- Compar- Compar- Compar- Compar- Compar- ative ative ative ative ative ative ative ative ative ative Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- ple 1 ple 2 ple 3 ple 4 ple 5 ple 6 ple 7 ple 8 ple 9 ple 10 Compo- Bu degree 69.1 69.1 69.1 69.1 69.1 69.1 69.1 69.1 69.1 69.1 sition (mol %) OH degree 30 30 30 30 30 30 30 30 30 30 (mol %) Ac degree 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 (mol %) Parts of 40 40 40 40 40 40 40 40 40 40 plasticizer (phr) Projec- Sm1 (μm) 200 390 290 400 300 295 230 230 400 301 tions and R1 (μm) 114 40 90 40 30 73 73 80 180 180 recesses Roughness 1.1 1.5 0.5 2 1.5 1.8 1.5 1.5 13 13 on first Rz1of tip surface portion of projection (μm) R1/Sm1 0.57 0.10 0.31 0.10 0.10 0.25 0.32 0.35 0.45 0.60 Roughness 30 42 38 45 37 33 37 35 45 45 Rz of first surface (μm) Projec- Sm2 (μm) 200 390 295 395 398 284 218 218 395 298 tions and R2 (μm) 110 40 93 38 36 78 73 75 147 147 recesses Roughness 1.1 1.5 0.4 1.8 1.5 1.5 1.4 1.4 22 22 on second Rz2 of tip surface portion of projection (μm) R2/Sm2 0.55 0.10 0.32 0.10 0.09 0.27 0.33 0.34 0.37 0.49 Roughness 32 44 36 39 34 33 38 37 39 39 Rz of second surface (μm) Intersection angle θ 20 8 10 5 5 5 10 20 20 45 R/Sm 0.56 0.10 0.31 0.10 0.10 0.26 0.33 0.35 0.41 0.55 (1000/Sm).sup.2 × Sin θ 8.55 0.91 2.03 0.55 0.72 1.04 3.46 6.82 2.16 7.88 Autohesion force (N/15 cm) 49.1 60.0 48.0 78.0 44.1 65.0 37.5 28.3 33.7 30.0

(47) TABLE-US-00004 TABLE 4 Compar- Compar- ative ative Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- Exam- ple 26 ple 27 ple 28 ple 29 ple 30 ple 31 ple 32 ple 33 ple 34 ple 11 ple 12 First Bu degree (mol %) 69 69 69 69 68.5 69.9 69 69 69 69 69 resin OH degree (mol %) 30 30 30 30 31 29 30 30 30 30 30 layer Ac degree (mol %) 1 1 1 1 0.5 1.1 1 1 1 1 1 Parts of plasticizer (phr) 36 36 36 36 36 39 36 36 36 36 36 Second Bu degree (mol %) 64 64 64 64 67 77.8 64 64 64 64 64 resin OH degree (mol %) 23.5 23.5 23.5 23.5 25 20.7 23.5 23.5 23.5 23.5 23.5 layer Ac degree (mol %) 12.5 12.5 12.5 12.5 8 1.5 12.5 12.5 12.5 12.5 12.5 Parts of plasticizer (phr) 76.5 76.5 76.5 76.5 75 79.3 76.5 76.5 76.5 76.5 76.5 Projec- Sm1 (μm) 390 195 197 195 295 285 292 294 392 202 392 tions and R1 (μm) 35 55 53 32 33 33 32 33 37 106 41 recesses Roughness Rz1of tip 1.2 2.2 2.1 1.9 2 15.2 2.3 15 15.8 1.6 2 on first portion of projection surface (μm) R1/Sm1 0.09 0.29 0.28 0.15 0.11 0.12 0.11 0.11 0.09 0.52 0.10 Roughness Rz of 45 48 51 45 46 55 45 55 44 30 44 first surface (μm) Projec- Sm2 (μm) 392 195 189 193 285 275 286 291 382 198 382 tions and R2 (μm) 35 52 50 33 31 33 33 33 36 104 40 recesses Roughness Rz2 of tip 1.6 2.5 2.4 2.2 2.5 15.4 2.9 16.2 15.3 1.1 2.3 on second portion of projection surface (μm) R2/Sm2 0.09 0.26 0.27 0.15 0.11 0.12 0.12 0.11 0.09 0.53 0.10 Roughness Rz of 46 46 51 46 46 56 46 52 43 35 42 second surface (μm) Intersection angle θ 20 20 75 90 20 20 20 20 20 20 8 R/Sm 0.09 0.27 0.27 0.15 0.11 0.12 0.11 0.11 0.09 0.53 0.10 (1000/Sm).sup.2 × Sin θ 2.24 8.99 25.93 26.57 4.07 4.36 4.09 4.00 2.28 8.55 0.93 Autohesion force (N/15 cm) 19.0 17.0 5.6 4.5 14.3 7.0 13.4 6.3 10.9 45.0 56.0

INDUSTRIAL APPLICABILITY

(48) The present invention can provide an interlayer film for a laminated glass which can be stored in a stacked state without experiencing autohesion so as to be easily peelable, and a laminated glass including the interlayer film for a laminated glass.

REFERENCE SIGNS LIST

(49) 1: One arbitrarily selected recess 2: Recess adjacent to the arbitrarily selected recess 3: Recess adjacent to the arbitrarily selected recess A: Interval between recess 1 and recess 2 B: Interval between recess 1 and recess 3 10: Interlayer film for a laminated glass 11: Recess having a groove shape with a continuous bottom on the first surface 12: Recess having a groove shape with a continuous bottom on the second surface 20: Projections and recesses on the first surface or second surface 21: Recess having a groove shape with a continuous bottom 22: Projection