Interlayer film for laminated glass, and laminated glass

Abstract

The present invention aims to provide an interlayer film for a laminated glass capable of exhibiting high deaeration properties even in a nip roll method and hardly forming air bubbles to enable the production of a highly visible laminated glass, 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 at least one surface, the recesses each having a groove shape with a continuous bottom and being regularly adjacent to each other in parallel with one another, the recesses each having a groove shape with a continuous bottom having a ratio (R/Sm100) of a radius of rotation R of the bottom to an interval Sm between the recesses of 15% or higher.

Claims

1. An interlayer film for a laminated glass, having a large number of recesses and a large number of projections on at least one surface, the recesses each having a groove shape with a continuous bottom and being regularly adjacent to each other in parallel with one another, the recesses each having a groove shape with a continuous bottom having a ratio (R/Sm100) of a radius of rotation R of the bottom to an interval Sm between the recesses of 15% or higher, and wherein the interval Sm between the recesses each having a groove shape with a continuous bottom is 300 m or less.

2. The interlayer film for a laminated glass according to claim 1, wherein the recesses each having a groove shape with a continuous bottom have a radius of rotation R of the bottom of 20 to 250 m.

3. The interlayer film for a laminated glass according to claim 2, wherein the interval Sm between the recesses each having a groove shape with a continuous bottom is 100 to 300 m.

4. The interlayer film for a laminated glass according to claim 1, wherein the interval Sm between the recesses each having a groove shape with a continuous bottom is 100 to 300 m.

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. A laminated glass, comprising: a pair of glass plates; and the interlayer film for a laminated glass according to claim 2 interposed between the pair of glass plates.

7. A laminated glass, comprising: a pair of glass plates; and the interlayer film for a laminated glass according to claim 3 interposed between the pair of glass plates.

8. A laminated glass, comprising: a pair of glass plates; and the interlayer film for a laminated glass according to claim 4 interposed between the pair of glass plates.

Description

DESCRIPTION OF EMBODIMENTS

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

Example 1

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

(3) Polyvinyl alcohol having an average degree of polymerization of 1700 was acetalized with n-butyraldehyde to give a polyvinyl butyral (acetyl group content: 1 mol %, butyral group content: 69 mol %, hydroxy group content: 30 mol %). To 100 parts by weight of the polyvinyl butyral were added 40 parts by weight of triethylene glycol-di-2-ethylhexanoate (3GO) as a plasticizer and a mixture of magnesium bis(2-ethylbutyrate) (50% by mass) and magnesium acetate (50% by mass) as an adhesion modifier such that the magnesium concentration in the film became 50 ppm. The mixture was kneaded sufficiently with a mixing roll to give a resin composition.

(4) The resin composition was extruded using an extruder to provide a single-layer interlayer film for a laminated glass having a thickness of 760 m.

(5) 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 process. First, random projections and recesses were formed on a pair of iron rolls with an abrasive material, and the iron rolls were subjected to vertical grinding. Finer projections and recesses were further formed on planar portions after the grinding with a finer abrasive material. In this manner, a pair of rolls in the same shape having a coarse main embossed pattern and a fine sub-embossed pattern were obtained. The pair of rolls was used as a device for transferring a pattern of projections and recesses to transfer a random pattern of projections and recesses to both faces 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 10 to 200 kN/m.

(6) In the second step, projections and recesses in which recesses each had a groove shape with a continuous bottom (shape of an engraved line) and were regularly adjacent to each other in parallel with one another at equal intervals were imparted to one surface of the interlayer film for a laminated glass by passing the obtained interlayer film for a laminated glass between a pair of rolls as a device for transferring a pattern of projections and recesses. The pair of rolls included a metal roll having a surface milled with a triangular oblique line-type mill and a rubber roll having a JIS hardness of 65 to 75. The transferring conditions employed here were a temperature of the interlayer film for a laminated glass of 70 C., a temperature of the rolls of 145 C., a linear velocity of 10 m/min, and a linear pressure of 5 to 100 kN/m. As a result of the measurement of the thickness of the film after the formation of the engraved lines, the thickness in the width direction and the machine direction was 760 m, and a difference between the maximum thickness and the minimum thickness was 25 m. The thickness profile was divided in the measurement direction to 15-cm sections, and the difference between the maximum thickness and the minimum thickness was recorded for each section. The difference in the thickness in the section where the difference was largest was 10 m.

(7) (2) Evaluation of Projections and Recesses of Interlayer Film for a Laminated Glass

(8) The interval Sm of the recesses in the shape of engraved lines, the radius of rotation R, and the roughness Rz of the recesses in the shape of engraved lines on the surface of the obtained interlayer film for a laminated glass were measured by the method in conformity with JIS B-0601(1994). The measurement was performed in the direction perpendicular to the engraved lines at a cut-off value of 2.5 mm, a standard length of 2.5 mm, an evaluation length of 12.5 mm, and a measurement rate of 0.5 mm/s, with a stylus having a tip radius of 2 m and a tip angle of 60.

(9) The interval of the recesses in the shape of engraved lines was determined as follows. The surface of the interlayer film for a laminated glass was observed at five sites (observation range: 20 mm20 mm) with an optical microscope (BS-D8000III produced by SONIC Corp.) for measurement of the interval of the adjacent recesses, and the average shortest distance between deepest bottoms of adjacent recesses was calculated.

(10) The interlayer film for a laminated glass was cut with a single-edged razor (e.g., 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 pushed out in a direction parallel to the thickness direction, without being slid in the direction perpendicular to the recesses. The cross section was observed using a microscope (DSX-100 produced by Olympus Corporation). The cross section was photographed at a magnification of 208 times, and the obtained image was enlarged to 50 m/20 mm for determining the radius of an inscribed circle (i.e., radius of rotation R) in the bottom of a recess in the shape of an engraved line. The Rz of the film surface after the first step was 15 m.

(11) Table 1 shows the measurement values in relation to the projections and recesses on the front surface and the rear surface of the interlayer film for a laminated glass.

Examples 2 to 13, Comparative Examples 1 to 4

(12) An 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 used were changed as shown in Tables 1 and 2 and the shape of projections and recesses to be imparted was changed by changing the shape of the embossing rolls in the first step and the triangular oblique line-type roll. Tables 1 and 2 show the measurement values in relation to the projections and recesses on the front surface and the rear surface of each of the interlayer films for a laminated glass obtained in the examples and comparative examples.

Example 14

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

(14) To 100 parts by weight of a polyvinyl butyral resin (hydroxy group content: 30 mol %, degree of acetylation: 1 mol %, degree of butyralization: 69 mol %, average degree of polymerization: 1700) were added 36 parts by weight of triethylene glycol-di-2-ethylhexanoate (3GO) as a plasticizer and a mixture of magnesium bis(2-ethylbutyrate) (50% by mass) and magnesium acetate (50% by mass) as an adhesion modifier such that the magnesium concentration in the film became 50 ppm. The mixture was kneaded sufficiently with a mixing roll to give a resin composition for protective layers.

(15) (Preparation of Resin Composition for Sound Insulation Layers)

(16) To 100 parts by weight of a polyvinyl butyral resin (hydroxy group content: 23.5 mol %, degree of acetylation: 12.5 mol %, degree of butyralization: 64 mol %, average degree of polymerization: 2300) were added 76.5 parts by weight of triethylene glycol-di-2-ethylhexanoate (3GO) as a plasticizer, and kneaded sufficiently with a mixing roll to give a resin composition for sound insulation layers.

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

(18) 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 m), a sound insulation layer (thickness: 100 m), and a protective layer (thickness: 350 m) stacked in the stated order in the thickness direction.

(19) 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 process. First, random projections and recesses were formed on a pair of iron rolls with an abrasive material, and the iron rolls were subjected to vertical grinding. Finer projections and recesses were further formed on planar portions after the grinding with a finer abrasive material. In this manner, a pair of rolls in the same shape having a coarse main embossed pattern and a fine sub-embossed pattern were obtained. The pair of rolls was used as a device for transferring a pattern of projections and recesses to transfer a random pattern of projections and recesses to both faces 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 10 to 200 kN/m.

(20) In the second step, projections and recesses in which recesses each had a groove shape with a continuous bottom (shape of an engraved line) and were regularly adjacent to each other in parallel with one another at equal intervals were imparted to one surface of the interlayer film for a laminated glass by passing the obtained interlayer film for a laminated glass between a pair of rolls as a device for transferring a pattern of projections and recesses. The pair of rolls included a metal roll having a surface milled with a triangular oblique line-type mill and a rubber roll having a JIS hardness of 65 to 75. The transferring conditions employed here were a temperature of the interlayer film for a laminated glass of 70 C., a temperature of the rolls of 145 C., a linear velocity of 10 m/min, and a linear pressure of 5 to 100 kN/m. As a result of the measurement of the thickness of the film after the formation of the engraved lines, the thickness in the width direction and the machine direction was 800 m, and a difference between the maximum thickness and the minimum thickness was 25 m. The thickness profile was divided in the measurement direction to 15-cm sections, and the difference between the maximum thickness and the minimum thickness was recorded for each section. The difference in the thickness in the section where the difference was largest was 10 m.

(21) (2) Evaluation of Projections and Recesses of Interlayer Film for a Laminated Glass

(22) The interval Sm of the recesses in the shape of engraved lines, the radius of rotation R, and the roughness Rz of the recesses in the shape of engraved lines on the surface of the obtained interlayer film for a laminated glass were measured by the method in conformity with JIS B-0601(1994). The measurement was performed in the direction perpendicular to the engraved lines at a cut-off value of 2.5 mm, a standard length of 2.5 mm, an evaluation length of 12.5 mm, and a measurement rate of 0.5 mm/s, with a stylus having a tip radius of 2 m and a tip angle of 60.

(23) The interval of the recesses in the shape of engraved lines was determined as follows. The surface of the interlayer film for a laminated glass was observed at five sites (observation range: 20 mm20 mm) with an optical microscope (BS-D8000III produced by SONIC Corp.) for measurement of the interval of the adjacent recesses, and the average shortest distance between deepest bottoms of adjacent recesses was calculated.

(24) The interlayer film for a laminated glass was cut with a single-edged razor (e.g., FAS-10 produced by FEATHER Safety Razor Co., Ltd.) in a direction perpendicular to the recesses in the shape of engraved lines and parallel to the thickness direction of the film in such a manner that the cut plane was not deformed. Specifically, the razor was pushed out in a direction parallel to the thickness direction, without being slid in the direction perpendicular to the recesses. The cross section was observed using a microscope (DSX-100 produced by Olympus Corporation). The cross section was photographed at a magnification of 208 times, and the obtained image was enlarged to 50 m/20 mm for determining the radius of an inscribed circle (i.e., radius of rotation R) in the bottom of a recess in the shape of an engraved line. The Rz of the film surface after the first step was 15 m.

(25) Table 3 shows the measurement values in relation to the projections and recesses on the front surface and the rear surface of the interlayer film for a laminated glass.

(26) (3) Measurement of Plasticizer Content

(27) 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 15 to 22, Comparative Examples 5 to 7

(28) An interlayer film for a laminated glass was produced as in Example 14, except that the acetyl group content, butyral group content, and hydroxy group content of the polyvinyl butyral used were changed as shown in Table 3 and the shape of projections and recesses to be imparted was changed by changing the shape of the embossing rolls in the first step and the triangular oblique line-type roll. Table 3 shows the measurement values in relation to the projections and recesses on the front surface and the rear surface of each of the interlayer films for a laminated glass obtained in the examples and comparative examples.

(29) (Evaluation)

(30) The interlayer films for a laminated glass obtained in the examples and the comparative examples were evaluated by the following methods.

(31) Tables 1, 2, and 3 show the results.

(32) <Evaluation in Nip Roll Method>

(33) (1) Evaluation of Embossed Pattern Remaining after Preliminary Pressure Bonding

(34) Each of the interlayer films for a laminated glass obtained in the examples and comparative examples was allowed to stand at 23 C. and 30 RH % for five hours, and then subjected to the following operations.

(35) The interlayer film for a laminated glass was interposed between two transparent glass plates (15 cm in length30 cm in width2.5 mm in thickness) to give a laminate. The laminate was primarily deaerated using first nip rolls (roll pressure: 2 kgf/cm.sup.2). The resulting laminate was carried on a roller conveyor through an infrared oven to be heated until the surface temperature reached 50 C. Then, the laminate was secondarily deaerated using second nip rolls (roll pressure: 4 kgf/cm.sup.2).

(36) The obtained laminate was further carried on the roller conveyor through the infrared oven to be heated until the glass surface temperature reached 85 C. Then, the laminate was passed between third nip rolls (roll pressure: 4 kgf/cm.sup.2) to be squeezed for removal of air remaining between the glass plates and the interlayer film (tertiary deaeration). The preliminary pressure bonding was thus completed. The gap between nip rolls in each step was set to be narrower than the thickness of the laminate by 1 mm, and the circumferential velocity of the nip rolls was set to 5 m/min. Tables 1, 2, and 3 show the angle between the recesses in the shape of engraved lines formed on the surface of the interlayer film for a laminated glass and the machine direction of the conveyor.

(37) The laminate after the preliminary pressure bonding was sufficiently cooled in liquid nitrogen so that the glass plate was separated from the interlayer film without leaving any glass pieces on the surface of the film. The interlayer film sheet was thus obtained. The obtained interlayer film sheet was allowed to stand at 23 C. and 30 RH % for one hour, and the residual embossed pattern on its surface was analyzed using a three-dimensional surface profilometer (Contour GT-K produced by Bulker AXS). The analysis of the embossed pattern using a three-dimensional surface profilometer was carried out within 24 hours.

(38) The measurement was performed at 20 sites in a region of between 10 cm and 20 cm away from the leading end of the glass plate in the machine direction of the roller conveyor and 3 cm away from each side edge of the glass plate. Each measuring site had an area of 1.3 mm1.3 mm.

(39) Based on the obtained three-dimensional shape, the volume of the remaining grooves was measured using Multivision analysis, accessory analysis software of the three-dimensional surface profilometer. The peeled surface of the film peeled from the glass plate was taken as the reference surface for calculation of the volume, while setting the Multivision analysis conditions. Specifically, the Zerolevel condition was set to Background and the value of By threshold was appropriately adjusted.

(40) The average volume of the grooves per unit area was calculated. The case where the average of 20 measured average volumes of the grooves was more than 1.5 m.sup.3/m.sup.2 (=m) was rated Poor (). The case where the average was 1.0 m.sup.3/m.sup.2 (=m) or more but not more than 1.5 m.sup.3/m.sup.2 (=m) was rated Good (). The case where the average was less than 1.0 m.sup.3/m.sup.2 (=m) was rated Excellent (). The average volume of the grooves refers to the average of the volumes of the grooves on the front surface and the rear surface in the same measurement site.

(41) (2) Evaluation of Foaming in a Laminated Glass (Condition 1)

(42) The interlayer films for a laminated glass obtained in the examples and comparative examples were each allowed to stand at 23 C. and 30 RH % for five hours, and then subjected to the following operations.

(43) The interlayer film for a laminated glass was interposed between two transparent glass plates (15 cm in length30 cm in width2.5 mm in thickness) to give a laminate. The laminate was primarily deaerated using first nip rolls (roll pressure: 2 kgf/cm.sup.2). The resulting laminate was carried on a roller conveyor through an infrared oven to be heated until the surface temperature reached 50 C. Then, the laminate was secondarily deaerated using second nip rolls (roll pressure: 4 kgf/cm.sup.2).

(44) The obtained laminate was further carried on the roller conveyor through the infrared oven to be heated until the glass surface temperature reached 85 C. Then, the laminate was passed between third nip rolls (roll pressure: 4 kgf/cm.sup.2) to be squeezed for removal of air remaining between the glass plates and the interlayer film (tertiary deaeration). The preliminary pressure bonding was thus completed. The gap between nip rolls in each step was set to be narrower than the thickness of the laminate by 1 mm, and the circumferential velocity of the nip rolls was set to 5 m/min. Tables 1, 2, and 3 show the angle between the recesses in the shape of engraved lines formed on the surface of the interlayer film for a laminated glass and the machine direction of the conveyor.

(45) (3) Evaluation of Foaming in a Laminated Glass (Condition 2)

(46) The interlayer films for a laminated glass obtained in the examples and comparative examples were each allowed to stand at 23 C. and 30 RH % for five hours, and then subjected to the following operations.

(47) The interlayer film for a laminated glass was interposed between two transparent glass plates (15 cm in length30 cm in width2.5 mm in thickness) to give a laminate. The laminate was primarily deaerated using first nip rolls (roll pressure: 2 kgf/cm.sup.2). The resulting laminate was carried on a roller conveyor through an infrared oven to be heated until the surface temperature reached 70 C. Then, the laminate was secondarily deaerated using second nip rolls (roll pressure: 4 kgf/cm.sup.2).

(48) The gap between nip rolls in each step was set to be narrower than the thickness of the laminate by 1 mm, and the circumferential velocity of the nip rolls was set to 5 m/min. Tables 1, 2, and 3 show the angle between the recesses in the shape of engraved lines formed on the surface of the interlayer film for a laminated glass and the machine direction of the conveyor.

(49) (4) Evaluation of Foaming in a Laminated Glass (Condition 3)

(50) The interlayer films for a laminated glass obtained in the examples and comparative examples were each allowed to stand at 23 C. and 30 RH % for five hours, and then subjected to the following operations.

(51) The interlayer film for a laminated glass was interposed between two transparent glass plates (15 cm in length30 cm in width2.5 mm in thickness) to give a laminate. The laminate was primarily deaerated using first nip rolls (roll pressure: 2 kgf/cm.sup.2). The resulting laminate was carried on a roller conveyor through an infrared oven to be heated until the surface temperature reached 60 C. Then, the laminate was secondarily deaerated using second nip rolls (roll pressure: 4 kgf/cm.sup.2). The gap between nip rolls in each step was set to be narrower than the thickness of the laminate by 1 mm, and the circumferential velocity of the nip rolls was set to 5 m/min. Tables 1, 2, and 3 show the angle between the recesses in the shape of engraved lines formed on the surface of the interlayer film for a laminated glass and the machine direction of the conveyor.

(52) The laminates obtained by the conditions 1 to 3 in the evaluation of foaming in a laminated glass were each held in an autoclave at a chamber pressure of 13 atm and a chamber temperature of 140 C. for 20 minutes, and then cooled until the chamber temperature reached 40 C., followed by depressurization of the chamber to 1 atm. A laminated glass was thus produced.

(53) The laminated glass was stored in an oven at 140 C. for two hours and taken out from the oven for cooling for three hours. Then, the appearance of the laminated glass was visually observed. The number of laminated glass sheets in which foaming (air bubbles) occurred between the glass plates and the interlayer film for a laminated glass in a region of at least 1 cm away from the glass edge, out of 20 laminated glass sheets was determined for each condition. The case where the number of laminated glass sheets with foaming was 5 or less was rated Good (). The case where the number of laminated glass sheets with foaming was 6 or more was rated Poor ().

(54) <Evaluation in Vacuum Deaeration Method>

(55) (Evaluation of Deaeration Properties after Preliminary Pressure Bonding by Vacuum Bag Method)

(56) The obtained interlayer film for a laminated glass was interposed between two transparent glass plates (15 cm in length15 cm in width2.5 mm in thickness) and the portions of the film protruding from the glass plates were cut off, thereby preparing a laminate. The obtained laminate was preliminarily heated in an oven until the glass surface temperature reached 50 C. The resulting laminate was placed in a rubber bag, which was then connected to a vacuum suction device. The rubber bag was heated so that the temperature of the laminate (preliminary pressure bonding temperature) reached 90 C. in 18 minutes, while being held under a reduced pressure of 600 mmHg. Thereafter, the pressure was returned to atmospheric pressure, whereby the preliminary pressure bonding was completed. A preliminarily pressure-bonded laminate was thus obtained.

(57) The collimated light transmittance of the obtained preliminarily pressure-bonded laminate was evaluated.

(58) Specifically, the collimated light transmittance Tp (%) of the preliminarily pressure-bonded laminate was measured with a haze meter (HM-150 produced by Murakami Color Research Laboratory) in conformity with JIS K 7105.

(59) The collimated light transmittance was measured at five measurement points in total including the intersection of two diagonals of the preliminarily pressure-bonded laminate and four points at 5.6 cm away in the diagonal direction from the apexes of the preliminary pressure-bonded laminate, and the average of the measured values was taken as the Tp.

(60) Before the measurement, the laminate was cut to the size including the above measurement points at the center and within a range that the measured values are not affected, and was used as a sample for measurement.

(61) Reduction in transparency of the laminated glass is caused by defective deaeration during preliminary pressure bonding. Accordingly, the deaeration properties of the interlayer film for a laminated glass can be evaluated more precisely by measurement of the visible light transmittance of the preliminarily deaerated laminate than analysis of foaming in the laminated glass.

(62) TABLE-US-00001 TABLE 1 Ex- Ex- Ex- Ex- Ex- Ex- Ex- Ex- Ex- Ex- ample ample ample ample ample ample ample ample ample ample 1 2 3 4 5 6 7 8 9 10 Composition Bu degree (mol %) 69 69 69 69 69 69 69 69.9 68.2 69 OH degree (mol %) 30 30 30 30 30 30 30 29 31 30 Ac degree (mol %) 1 1 1 1 1 1 1 1.1 0.8 1 Parts of plasticizer (phr) 40 40 40 40 40 40 40 41 39 40 Shape of Interval Sm of recesses in the shape 210 300 211 212 215 210 300 201 210 150 projections of engraved lines (m) and recesses Radius of rotation R of recesses in 65 180 69 48 66 65 175 40 38 30 on front the shape of engraved lines (m) surface of R/Sm 100 (%) 31.0 60.0 32.7 22.6 30.7 31.0 58.3 19.9 18.1 20.0 interlayer Roughness Rz of recesses in the 55 34 43 43 31.4 48 33 45 40 35 film shape of engraved lines (m) Angle of engraved lines relative to 45 10 55 55 55 55 10 55 55 45 machine direction () Shape of Interval Sm of recesses in the shape 210 400 224 225 227 221 300 197 195 153 projections of engraved lines (m) and recesses Radius of rotation R of recesses in 50 73 71 40 60 65 183 43 48 28 on rear the shape of engraved lines (m) surface of R/Sm 100 (%) 23.8 18.3 31.7 17.8 26.4 29.4 61.0 21.8 24.6 18.3 interlayer Roughness Rz of recesses in the 50 33 42 56 36.2 63 30 46 38 38 film shape of engraved lines (m) Angle of engraved lines relative to 45 10 35 35 35 35 10 35 35 45 machine direction () Evaluation Average volume of m.sup.3/m.sup.2 1.3 0.6 1.2 1.4 1.1 1.3 0.3 1.3 1.3 1 in nip roll grooves after Rating method preliminary pressure bonding Evaluation of Test condition 1 foaming in Test condition 2 X X X X X laminated glass Test condition 3 X X X X X X X X Evaluation Collimated light transmittance Tp 55 35 45 71 44 58 33 60 68 68 in vacuum of preliminary pressure-bonded deaeration laminate (%) method

(63) TABLE-US-00002 TABLE 2 Com- Com- Com- Com- parative parative parative parative Ex- Ex- Ex- Ex- Ex- Ex- Ex- ample ample ample ample ample ample ample 11 12 13 1 2 3 4 Composition Bu degree (mol %) 69 69 69 69 69 69 69 OH degree (mol %) 30 30 30 30 30 30 30 Ac degree (mol %) 1 1 1 1 1 1 1 Parts of plasticizer (phr) 40 40 40 40 40 40 40 Shape of Interval Sm of recesses in the shape 120 150 198 200 207 215 215 projections of engraved lines (m) and recesses Radius of rotation R of recesses in 30 24 140 12 12 11 24 on front the shape of engraved lines (m) surface of R/Sm 100 (%) 25.0 16.0 70.7 6.0 5.8 5.1 11.2 interlayer Roughness Rz of recesses in the 25 30 23 55 41 35 45 film shape of engraved lines (m) Angle of engraved lines relative to 45 45 10 55 55 55 55 machine direction () Shape of Interval Sm of recesses in the shape 125 153 190 197 225 227 220 projections of engraved lines (m) and recesses Radius of rotation R of recesses in 45 24 133 10 20 9 27 on rear the shape of engraved lines (m) surface of R/Sm 100 (%) 36.0 15.7 70.0 5.1 8.9 4.0 12.3 interlayer Roughness Rz of recesses in the 24 31 24 60 45 35 44 film shape of engraved lines (m) Angle of engraved lines relative to 45 45 10 35 35 35 35 machine direction () Evaluation Average volume of m.sup.3/m.sup.2 0.8 1 0.4 1.8 1.5 1 1.5 in nip roll grooves after Rating X method preliminary pressure bonding Evaluation of Test condition 1 X X X X foaming in Test condition 2 X X X X X laminated glass Test condition 3 X X X X X X Evaluation Collimated light transmittance Tp 54 66 28 70 71 67 60 in vacuum of preliminary pressure-bonded deaeration laminate (%) method

(64) TABLE-US-00003 TABLE 3 Com- Com- Com- parative parative parative Ex- Ex- Ex- Ex- Ex- Ex- Ex- Ex- Ex- Ex- Ex- Ex- ample ample ample ample ample ample ample ample ample ample ample ample 14 15 16 17 18 19 20 21 22 5 6 7 Composition Bu degree (mol %) 69 69 69 69.9 68.5 69 69 69 69 69 69 69 of protective OH degree (mol %) 30 30 30 29 31 30 30 30 30 30 30 30 layer Ac degree (mol %) 1 1 1 1.1 0.5 1 1 1 1 1 1 1 Parts of plasticizer (phr) 36 36 36 39 36 36 36 36 36 36 36 36 Composition Bu degree (mol %) 64 64 64 77.8 67 64 64 64 64 64 64 64 of sound OH degree (mol %) 23.5 23.5 23.5 20.7 25 23.5 23.5 23.5 23.5 23.5 23.5 23.5 insulation Ac degree (mol %) 12.5 12.5 12.5 1.5 8 12.5 12.5 12.5 12.5 12.5 12.5 12.5 layer Parts of plasticizer (phr) 76.5 76.5 76.5 79.2 75 76.5 76.5 76.5 76.5 76.5 76.5 76.5 Shape of Interval Sm of recesses in the shape 210 310 210 200 198 200 155 125 200 200 200 198 projections of engraved lines (m) and recesses Radius of rotation R of recesses in 63 175 48 42 35 66 28 30 138 12 11 20 on front the shape of engraved lines (m) surface of R/Sm 100 (%) 30.0 56.5 22.9 21.0 17.7 33.0 18.1 24.0 69.0 6.0 5.5 10.1 interlayer Roughness Rz of recesses in the 53 35 44 44 42 48 35 25 26 53 35 43 film shape of engraved lines (m) Angle of engraved lines relative to 45 10 55 55 55 55 45 45 10 55 55 55 machine direction () Shape of Interval Sm of recesses in the shape 210 389 220 195 192 210 154 124 195 197 197 190 projections of engraved lines (m) and recesses Radius of rotation R of recesses in 48 74 38 42 40 63 25 43 130 10 9 27 on rear the shape of engraved lines (m) surface of R/Sm 100 (%) 22.9 19.0 17.3 21.5 20.8 30.0 16.2 34.7 66.7 5.1 4.6 14.2 interlayer Roughness Rz of recesses in the 48 35 54 45 38 50 38 26 26 52 35 45 film shape of engraved lines (m) Angle of engraved lines relative to 45 10 35 35 35 35 45 45 10 35 35 35 machine direction () Evaluation Average volume of m.sup.3/m.sup.2 1.2 0.3 1.4 1.2 1.2 1.2 1.1 0.9 0.4 1.8 1 1.5 in nip roll grooves after Rating X method preliminary pressure bonding Evaluation of Test condition 1 X X X foaming in Test condition 2 X X X X X X X X laminated glass Test condition 3 X X X X X X X X X X Evaluation Collimated light transmittance Tp 58 40 73 58 66 55 70 55 30 71 64 58 in vacuum of preliminary pressure-bonded deaeration laminate (%) method

INDUSTRIAL APPLICABILITY

(65) The present invention can provide an interlayer film for a laminated glass capable of exhibiting high deaeration properties even in a nip roll method and hardly forming air bubbles to enable the production of a highly visible laminated glass, and also can provide a laminated glass including the interlayer film for a laminated glass.