Interlayer film for laminated glass and laminated glass

Abstract

The present invention is an interlayer film for laminated glass that includes 2 or more resin layers laminated on each other. The interlayer film for laminated glass has a large number of recesses and a large number of protrusions on at least one surface thereof. The recesses each have a groove shape with a continuous bottom. The recesses adjacent to each other are parallel to each other and regularly arranged in a line.

Claims

1. An interlayer film for laminated glass comprising 2 or more resin layers laminated on each other, wherein the resin layers contain polyvinyl acetal and a plasticizer, wherein at least one of the resin layers has a plurality of recesses and a plurality of protrusions on an outer surface such that the interlayer film has the plurality of recesses and the plurality of protrusions on at least one outer surface thereof, the recesses each have a groove shape with a continuous bottom, the recesses adjacent to each other are parallel to each other and regularly arranged in a line, within the at least one outer surface of the interlayer film having the plurality of recesses and the plurality of protrusions, a groove depth (Rzg) of the recesses measured based on JIS B-0601(1994) is 10 m to 40 m, and a 10-point average roughness (Rz) of an inner surface of the resin layer having the plurality of recesses and the plurality of protrusions measured based on JIS B 0601(1994) is less than 2.7 m, wherein the 10-point average roughness (Rz) is obtained by: peeling off the resin layer having the plurality of recesses and the plurality of protrusions from another resin layer in direct contact with the resin layer having the plurality of recesses and the plurality of protrusions to expose the inner surface of the resin layer having the plurality of recesses and the plurality of protrusions, wherein the inner surface of the resin layer having the plurality of recesses and the plurality of protrusions is the surface that was in direct contact with the another resin layer prior to the peeling off, and then measuring the inner surface of the resin layer having the plurality of recesses and the plurality of protrusions based on JIS B 0601(1994).

2. The interlayer film for laminated glass according to claim 1, wherein the recesses adjacent to each other are parallel to each other and arranged in a line at an equal interval.

3. The interlayer film for laminated glass according to claim 1, comprising at least: a first resin layer; and a second resin layer, wherein the amount of hydroxyl groups of the polyvinyl acetal contained in the first resin layer is different from the amount of hydroxyl groups of the polyvinyl acetal contained in the second resin layer.

4. The interlayer film for laminated glass according to claim 1, wherein the content of the plasticizer in the first resin layer with respect to 100 parts by mass of the polyvinyl acetal is different from the content of the plasticizer in the second resin layer with respect to 100 parts of the polyvinyl acetal.

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

6. The interlayer film for laminated glass according to claim 1, wherein the plurality of recesses consists of recesses that are parallel to each other and regularly arranged in a line.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is schematic view showing an example of an interlayer film for laminated glass, in which recesses each having a groove shape with a continuous bottom are formed on the surface thereof at an equal interval, and the recesses adjacent to each other are parallel to each other and arranged in a line.

(2) FIG. 2 is a schematic view showing an example of the interlayer film for laminated glass, in which recesses each having a groove shape with a continuous bottom are formed on the surface thereof at an equal interval, and the recesses adjacent to each other are parallel to each other and arranged in a line.

(3) FIG. 3 is a schematic view showing an example of the interlayer film for laminated glass, in which recesses each having a groove shape with a continuous bottom are formed on the surface thereof at an unequal interval, and the recesses adjacent to each other are parallel to each other and arranged in a line.

(4) FIG. 4 is a schematic view illustrating the interlayer film for laminated glass having a 2-layered structure, and a surface thereof in which a 10-point average roughness (Rz) is measured.

(5) FIG. 5 is a schematic view illustrating the interlayer film for laminated glass having a 3-layered structure, and a surface thereof in which a 10-point average roughness (Rz) is measured.

DESCRIPTION OF EMBODIMENTS

(6) Hereinafter, embodiments of the present invention will be more specifically described based on examples, but the present invention is not limited to the examples.

Example 1

(1) Preparation of Resin Composition for Sound Insulating Layer

(7) As a plasticizer, 60 parts by mass of triethylene glycol-di-2-ethyl hexanoate (3GO) was added to 100 parts by mass of polyvinyl butyral (an amount of acetyl groups: 12 mol %, an amount of butyral groups: 66 mol %, an amount of hydroxyl groups: 22 mol %) which was obtained by acetalizing polyvinyl alcohol having an average degree of polymerization of 2,400 by using n-butyl aldehyde, and the resultant was thoroughly kneaded by using a mixing roll, thereby obtaining a resin composition for a sound insulating layer.

(2) Preparation of Resin Composition for Protective Layer

(8) As a plasticizer, 40 parts by mass of triethylene glycol-di-2-ethyl hexanoate (3GO) was added to 100 parts by mass of polyvinyl butyral (an amount of acetyl groups: 1 mol %, an amount of butyral groups: 69 mol %, an amount of hydroxyl groups: 30 mol %) which was obtained by acetalizing polyvinyl alcohol having an average degree of polymerization of 1,700 by using n-butyl aldehyde, and the resultant was thoroughly kneaded by using a mixing roll, thereby obtaining a resin composition for a protective layer.

(3) Preparation of Interlayer Film for Laminated Glass

(9) The obtained resin composition for a sound insulating layer and resin composition for a protective layer were coextruded by using a coextruder, thereby obtaining an interlayer film for laminated glass (sound insulating interlayer film) having a 3-layered structure in which a layer A (protective layer) formed of the resin composition for a protective layer and having a thickness of 450 m, a layer B (sound insulating layer) formed of the resin composition for a sound insulating layer and having a thickness of 100 m, and a layer C (protective layer) formed of the resin composition for a protective layer and having a thickness of 450 m were laminated on each other in this order.

(4) Formation of Recesses and Protrusions

(10) As a first step, the shape of random recesses and protrusions was transferred to both surfaces of the interlayer film for laminated glass according to the following procedure. First, by using a blasting agent, random recesses and protrusions were formed on the surface of an iron roll, and then vertical grinding was performed on the iron roll. Furthermore, by using a finer blasting agent, fine recesses and protrusions were formed on a flat portion formed after the grinding. As a result, a pair of rolls of the same shape having both the coarse main embossments and fine sub-embossments was obtained. By using the pair of rolls as a device for transferring the shape of recesses and protrusions, the shape of random recesses and protrusions was transferred to both surfaces of the obtained interlayer film for laminated glass. At this time, as the transfer conditions, the temperature of the interlayer film for laminated glass was set to be 80 C., the temperature of the rolls was set to be 145 C., the linear velocity was set to be 10 m/min, and the linear press pressure was set to be 10 kN/m to 200 kN/m. The surface roughness of the shaped interlayer film for laminated glass was measured as the 10-point average roughness (Rz) described in JIS B 0601 (1994). As a result, the surface roughness was confirmed to be 16 m. The surface roughness was obtained by performing data processing on digital signals measured using a surface roughness tester (SE1700 manufactured by Kosaka Laboratory Ltd.). The surface roughness was measured in a direction perpendicular to the engraved line, under conditions of a cutoff value=2.5 mm, a reference length=2.5 mm, an evaluation length=12.5 mm, a radius of the tip of a probe=2 m, a tip angle=60, and a measurement rate=0.5 mm/s.

(11) As a second step, recesses and protrusions each having a groove shape with a continuous bottom (a shape of an engraved line) were formed on a surface of the interlayer film for laminated glass according to the following procedure. As a device for transferring the shape of recesses and protrusions, a pair of rolls composed of a metal roll of which the surface had undergone milling processing by using a triangular inclined mill and a rubber roll having a JIS hardness of 45 to 75 was used. The interlayer film for laminated glass, to which the shape of random recesses and protrusions had been transferred in the first step, was passed through the device for transferring the shape of recesses and protrusions. As a result, on a surface of the layer A of the interlayer film for laminated glass, recesses and protrusions were formed, in which the recesses each having a groove shape with a continuous bottom (a shape of an engraved line) were parallel to each other and arranged in a line at an equal interval. At this time, as the transfer conditions, the temperature of the interlayer film for laminated glass was set to be room temperature, the roll temperature was set to be 130 C., the linear velocity was set to 10 m/min, the film width was set to be 1.5 m, and the press pressure was set to be 500 kPa.

(12) Subsequently, a surface of the layer C of the interlayer film for laminated glass was subjected to the same operation as described above, except that a metal roll having a different shape of recesses and protrusions was used, and in this way, recesses each having a groove shape with a continuous bottom (a shape of an engraved line) were formed on the surface. At this time, the recesses were formed such that a crossing angle between the recesses each having a groove shape with a continuous bottom (a shape of an engraved line) that were formed on the surface of the layer A and the recesses each having a groove shape with a continuous bottom (a shape of an engraved line) that were formed on the surface of the layer C became 10.

(5) Measurement of Recesses and Protrusions of Surface of Layer A and Layer C

(13) By using an optical microscope (BS-8000III manufactured by SONIC-GROUP), the surface (an observation range of 20 mm20 mm) of the layer A and the layer C of the obtained interlayer film for laminated glass was observed. Furthermore, an interval between the recesses adjacent to each other was measured, and then the average of the shortest distances between the very bottom portions of the recesses adjacent to each other was calculated, thereby obtaining an interval between the recesses. An interval between the recesses on the surface of the layer A was 500 m, and an interval between the recesses on the surface of the layer C was 750 m. Herein, the average and the maximum value of the shortest distance were the same for the layer A and the layer C.

(14) In order to obtain the groove depth (Rzg) of the recesses on the surface of the layer A and the layer C of the obtained interlayer film for laminated glass, a groove depth based on a mean line of a roughness curve (a line set such that the sum of squares of deviation from the roughness curve is minimized) was calculated by setting a reference length specified in JIS B-0601 (1994) Surface roughness-definition and expression to be 2.5 mm; an average of the depths of the grooves measured was taken as a groove depth per reference length; and an average of the groove depth per reference length of 5 grooves was taken as the groove depth (Rzg). The number of grooves of the layer A was 5, and the number of grooves of the layer C was 4. Furthermore, the groove depth (Rzg) of the recesses of the surface of the layer A and the layer C was obtained by performing data processing on digital signals measured using a surface roughness tester (SE1700 manufactured by Kosaka Laboratory Ltd.). The surface roughness was measured in a direction perpendicular to the engraved line, under the conditions of a radius of the tip of a probe=2 m, a tip angle=60, and a measurement rate=0.5 mm/s.

(15) The groove depth (Rzg) of the recesses of the surface of the layer A was 21 m, and the groove depth (Rzg) of the recesses of the surface of the layer C was 19 m.

(16) In addition, the surface of the layer A and the layer C of the obtained interlayer film for laminated glass was measured using a surface roughness tester (SE1700 manufactured by Kosaka Laboratory Ltd.), thereby obtaining the 10-point average roughness (Rz) thereof. The 10-point average roughness (Rz) of the surface of the layer A was 51 m, and the 10-point average roughness (Rz) of the surface of the layer C was 50 m.

(6) Measurement of Recesses and Protrusions of Interface

(17) The obtained interlayer film for laminated glass was cut to 5 cm (length)5 cm (width) and allowed to stand for 2 hours in an environment with a temperature of 25 C. and a humidity of 30%.

(18) By inserting a finger between the layer A and the layer B, the layers were peeled off from each other at a rate of 10 cm/s to 15 cm/s. After the peeling off, they were allowed to stand for 2 hours in an environment with a temperature of 25 C. and a humidity of 30%. Subsequently, the surface of the peeled off layer A on the side of the layer B was measured using a high-precision profilometry system (manufactured by KEYENCE CORPORATION, KS-1100 equipped with a tip head of LT-9510VM model) based on JIS B 0601 (1994), thereby obtaining the 10-point average roughness (Rz). The 10-point average roughness (Rz) of the surface of the peeled off layer A on the side of the layer B was 1.7 m. Regarding the measurement conditions, a stage moving rate was set to be 100.0 m/s, a measurement pitch of an X-axis was set to be 2.0 m, and a measurement pitch of a Y-axis was set to be 2.0 m.

(19) The layer B and the layer C were also peeled off from each other in the same method as described above, and the 10-point average roughness (Rz) of the surface of the peeled off layer C on the side of the layer B was obtained. The 10-point average roughness (Rz) of the surface of the peeled off layer C on the side of the layer B was 1.9 m.

Examples 2 to 5, Comparative Example 1

(20) Interlayer films for laminated glass were prepared by the same method as in Example 1, except that the thickness of each layer, the interval between the recesses on the surface of the layer A and the layer C, the groove depth (Rzg) of the recesses, the 10-point average roughness (Rz), the 10-point average roughness (Rz) of the surface of the peeled off layer A on the side of the layer B, and the 10-point average roughness (Rz) of the surface of the peeled off layer C on the side of the layer B were set as shown in Table 1.

(21) In Example 2, as the transfer conditions at the time of forming the recesses and protrusions, the temperature of the interlayer film for laminated glass was set to be room temperature, the roll temperature was set to be 130 C., the linear velocity was set to be 10 m/min, the film width was set to be 1.5 m, and the press pressure was set to be 200 kPa.

(22) In Example 3, as the transfer conditions at the time of forming the recesses and protrusions, the temperature of the interlayer film for laminated glass was set to be room temperature, the roll temperature was set to be 130 C., the linear velocity was set to be 10 m/min, the film width was set to be 1.5 m, and the press pressure was set to be 400 kPa.

(23) In Example 4, as the transfer conditions at the time of forming the recesses and protrusions, the temperature of the interlayer film for laminated glass was set to be room temperature, the roll temperature was set to be 130 C., the linear velocity was set to be 10 m/min, the film width was set to be 1.5 m, and the press pressure was set to be 500 kPa.

(24) In Example 5, as the transfer conditions at the time of forming the recesses and protrusions, the temperature of the interlayer film for laminated glass was set to be room temperature, the roll temperature was set to be 130 C., the linear velocity was set to be 10 m/min, the film width was set to be 1.5 m, and the press pressure was set to be 500 kPa.

(25) In Comparative example 1, as the transfer conditions at the time of forming the recesses and protrusions, the temperature of the interlayer film for laminated glass was set to be room temperature, the roll temperature was set to be 130 C., the linear velocity was set to be 10 m/min, the film width was set to be 1.5 m, and the press pressure was set to be 200 kPa.

(26) Herein, in the step of measuring the interval between the recesses in Examples 2 to 5 and Comparative example 1, the average and the maximum value of the shortest distance between the recesses were the same for all of the examples.

Examples 6 and 7, Comparative Example 2

(27) Interlayer films for laminated glass were prepared by the same method as in Example 1, except that the thickness of each layer, the interval between the recesses of the surface of the layer A and the layer C, the groove depth (Rzg) of the recesses, the 10-point average roughness (Rz), the 10-point average roughness (Rz) of the surface of the peeled off layer A on the side of the layer B, and the 10-point average roughness (Rz) of the surface of the peeled off layer C on the side of the layer B were set as shown in Table 1, and the transfer conditions at the time of forming the recesses and protrusions were changed.

(28) In Example 6, as the transfer conditions at the time of forming the recesses and protrusions, the temperature of the interlayer film for laminated glass was set to be room temperature, the roll temperature was set to be 130 C., the linear velocity was set to be 10 m/min, the film width was set to be 1.5 m, and the press pressure was set to be 700 kPa.

(29) In Example 7, as the transfer conditions at the time of forming the recesses and protrusions, the temperature of the interlayer film for laminated glass was set to be room temperature, the roll temperature was set to be 130 C., the linear velocity was set to be 10 m/min, the film width was set to be 1.5 m, and the press pressure was set to be 200 kPa.

(30) In Comparative example 2, as the transfer conditions at the time of forming the recesses and protrusions, the temperature of the interlayer film for laminated glass was set to be room temperature, the roll temperature was set to be 130 C., the linear velocity was set to be 10 m/min, the film width was set to be 1.5 m, and the press pressure was set to be 100 kPa.

(31) Herein, in the step of measuring the interval between the recesses in Examples 6 and 7 and Comparative example 2, the average and the maximum value of the shortest distance between the recesses were the same for all of the examples.

Comparative Examples 3 and 4

(32) As a device for transferring orange peel-like embossments, a pair of rolls was used which had undergone blasting processing in which a blasting material formed of aluminum oxide (#36: having a roughness of 65 m under a saturation condition) had been discharged to the rolls at a discharge pressure of 5010.sup.4 Pa. The interlayer film for laminated glass obtained in Example 1 was passed through the device for transferring orange peel-like embossments, and as a result, orange peel-like embossments were formed on the surface of the layer A and the layer C of the interlayer film for laminated glass.

(33) At this time, as the transfer conditions, the temperature of the interlayer film for laminated glass was set to be room temperature, the roll temperature was set to be 130 C., the linear velocity was set to be 10 m/min, the film width was set to be 1.5 m, and the press pressure was set to be 500 kPa.

(34) Herein, in the interlayer film for laminated glass obtained in Comparative examples 3 and 4, the groove depth (Rzg) could not be measured.

Examples 8 to 10

(35) Interlayer films for laminated glass were prepared by the same method as in Example 1, except that the thickness of each layer, the interval between the recesses of the surface of the layer A and the layer C, the groove depth (Rzg) of the recesses, the 10-point average roughness (Rz), the 10-point average roughness (Rz) of the surface of the peeled off layer A on the side of the layer B, and the 10-point average roughness (Rz) of the surface of the peeled off layer C on the side of the layer B were set as shown in Table 1.

(36) In Example 8, as the transfer conditions at the time of forming the recesses and protrusions, the temperature of the interlayer film for laminated glass was set to be room temperature, the roll temperature was set to be 130 C., the linear velocity was set to be 10 m/min, the film width was set to be 1.5 m, and the press pressure was set to be 200 kPa.

(37) In Example 9, as the transfer conditions at the time of forming the recesses and protrusions, the temperature of the interlayer film for laminated glass was set to be room temperature, the roll temperature was set to be 130 C., the linear velocity was set to be 10 m/min, the film width was set to be 1.5 m, and the press pressure was set to be 500 kPa.

(38) In Example 10, as the transfer conditions at the time of forming the recesses and protrusions, the temperature of the interlayer film for laminated glass was set to be room temperature, the roll temperature was set to be 130 C., the linear velocity was set to be 10 m/min, the film width was set to be 1.5 m, and the press pressure was set to be 500 kPa.

(39) Herein, in the step of measuring the interval between the recesses in Examples 8 to 10, the average and the maximum value of the shortest distance between the recesses were the same for all of the examples.

Examples 11 to 14

(40) Interlayer films for laminated glass were prepared by the same method as in Example 1, except that the amount of acetyl groups, the amount of butyral groups, and the amount of hydroxyl groups of the polyvinyl butyral used in the protective layer and the sound insulating layer as well as the content of the plasticizer were changed as shown in Table 1; the thickness of each layer, the interval between the recesses of the surface of the layer A and the layer B, the groove depth (Rzg) of the recesses, the 10-point average roughness (Rz), the 10-point average roughness (Rz) of the surface of the peeled off layer A on the side of the layer B, and the 10-point average roughness (Rz) of the surface of the peeled off layer C on the side of the layer B were set as shown in Table 1; and the transfer conditions at the time of forming the recesses and protrusions were changed. Herein, the polyvinyl butyral used in the protective layer and the sound insulating layer was obtained by acetalizing polyvinyl alcohol having an average degree of polymerization of 1,700 by using n-butyl aldehyde.

(41) In Example 11, as the transfer conditions at the time of forming the recesses and protrusions, the temperature of the interlayer film for laminated glass was set to be room temperature, the roll temperature was set to be 130 C., the linear velocity was set to be 10 m/min, the film width was set to be 1.5 m, and the linear press pressure was set to be 200 kPa.

(42) In Example 12, as the transfer conditions at the time of forming the recesses and protrusions, the temperature of the interlayer film for laminated glass was set to be room temperature, the roll temperature was set to be 130 C., the linear velocity was set to be 10 m/min, the film width was set to be 1.5 m, and the linear press pressure was set to be 500 kPa.

(43) In Example 13, as the transfer conditions at the time of forming the recesses and protrusions, the temperature of the interlayer film for laminated glass was set to be room temperature, the roll temperature was set to be 130 C., the linear velocity was set to be 10 m/min, the film width was set to be 1.5 m, and the linear press pressure was set to be 500 kPa.

(44) In Example 14, as the transfer conditions at the time of forming the recesses and protrusions, the temperature of the interlayer film for laminated glass was set to be room temperature, the roll temperature was set to be 130 C., the linear velocity was set to be 10 m/min, the film width was set to be 1.5 m, and the linear press pressure was set to be 550 kPa.

(45) Herein, in the step of measuring the interval between the recesses in Examples 11 to 14, the average and the maximum value of the shortest distance between the recesses were the same for all of the examples.

(46) (Evaluation)

(47) The interlayer films for laminated glass obtained in examples and comparative examples were evaluated by the following method.

(48) The results are shown in Table 1. In the table, Degree of butylation represents the amount of butyral groups, Degree of hydroxylation represents the amount of hydroxyl groups, Degree of acetylation represents the amount of acetyl groups, and Plasticizer (parts) represents the content of the plasticizer with respect to 100 parts by mass of polyvinyl butyral.

(49) (1) Evaluation of Deaerating Properties

(50) The obtained interlayer film for laminated glass having the recesses and protrusions on a surface thereof was preliminarily pressure-bonded and then full pressure-bonded by means of a vacuum deaeration method, thereby preparing laminated glass.

(51) (Vacuum Deaeration Method)

(52) The interlayer film was interposed between 2 sheets of clear glass plates (30 cm (length)30 cm (width)2.5 mm (thickness)), and the portion sticking out of the glass plates was cut off. Laminated glass structure (laminate) obtained in this way was moved into a rubber bag, and the rubber bag was connected to a suction decompressor. The laminated glass structure was then heated and held under a pressure reduced to 60 kPa (an absolute pressure of 16 kPa) for 10 minutes. The laminated glass structure (laminate) was kept heated until the temperature (preliminary pressure-bonding temperature) thereof became 70 C., and then the pressure was returned to the atmospheric pressure to finish the preliminary pressure-bonding. Herein, at the time of the preliminary pressure-bonding, deaeration was started at a temperature of 40 C., 50 C., and 60 C.

(53) (Full Pressure-Bonding)

(54) The laminated glass structure (laminate) having been full pressure-bonded by the aforementioned method was put into an autoclave and held under conditions of a temperature of 140 C. and a pressure of 1,300 kPa for 10 minutes. The laminated glass was then cooled to 50 C., and the pressure was returned to the atmospheric pressure to finish full pressure-bonding. In this way, laminated glass was prepared.

(55) (Baking Test of Laminated Glass)

(56) The obtained laminated glass was heated for 2 hours in an oven at 140 C. Thereafter, the laminated glass was taken out of the oven and left to cool for 3 hours, and then the external appearance of the laminated glass was visually observed. For 20 sheets of the laminated glass, the number of the laminated glass in which bubbles (air bubbles) occurred between the glass plate and the interlayer film for laminated glass was counted. A case where the number of the laminated glass in which bubbles occurred under all of the conditions was equal to or less than 5 was evaluated to be O, and a case where the number of the laminated glass in which bubbles occurred was equal to or greater than 6 was evaluated to be X.

(57) (2) Evaluation of Optical Strain

(58) A fluorescent lamp (FL32S.D manufactured by Panasonic Corporation) was placed at a point 7 m away from an observer, and the obtained laminated glass was placed at a point 40 cm away from the observer on a straight line connecting the fluorescent lamp to the observer, such that the laminated glass slanted by 20 with respect to a horizontal plane. A case where the fluorescent lamp was seen to be distorted through the laminated glass was evaluated to be X, and a case where the fluorescent lamp was seen without distortion through the laminated glass was evaluated to be O.

(59) (3) Evaluation of Occurrence of Ghost Image

(60) By using two types of light sources 1 and 2 having different brightness, whether or not a ghost image occurred was evaluated. The light source 1 was a 10 W silica light bulb (manufactured by Kyokko Ins., PS55 E 26 110 V-10 W, a total luminous flux of 70 lm) which was assumed to be a source of light having general brightness that may enter window glasses of automobiles, airplanes, buildings, and the like. The light source 2 was a 40 W silica light bulb (manufactured by ASAHI ELECTRIC CO., LTD., LW 100 V 38 W-W, a total luminous flux of 440 lm) which was assumed to be a source of light having particularly high brightness among lights that can enter window glasses of automobiles, airplanes, buildings, and the like. Through the method based on JIS R 3212 (2008), whether or not a ghost image occurred in the obtained laminated glass was evaluated. As a result, a case where only a single image was observed when any of the light source 1 and the light source 2 was used or a case where a double image 15 minutes of arc was evaluated to be OO. Furthermore, a case where a ghost image occurred when the light source 2 was used, but a single image was observed when the light source 1 was used or a case where a double image 15 minutes of arc was evaluated to be O. In addition, a case where a triple image occurred when any of the light source 1 and the light source 2 was used was evaluated to be X.

(61) Herein, the laminated glass was measured by assuming that the angle thereof actually mounted on a car is 30. Furthermore, the layer A was disposed such that an angle formed between the recess having the shape of an engraved line formed on the surface of the layer A and a horizontal direction became 5, and the layer B was disposed such that an angle formed between the recess having the shape of an engraved line formed on the surface of the layer C and a horizontal direction became 5.

(62) Moreover, the double image 15 minutes of arc was not an image resulting from the interlayer film but an image resulting from glass.

(63) TABLE-US-00001 TABLE 1 Example 1 Example 2 Example 3 Example 4 Example 5 Compounding Deposition Degree of 69 69 69 69 69 of protective butylation layer (mol %) Degree of 30 30 30 30 30 hydroxylation (mol %) Degree of 1 1 1 1 1 acetylation (mol %) Plasticizer 40 40 40 40 40 (parts) (phr) Composition Degree of 66 66 66 66 66 of sound butylation insulating (mol %) layer Degree of 22 22 22 22 22 hydroxylation (mol %) Degree of 12 12 12 12 12 acetylation (mol %) Plasticizer 60 60 60 60 60 (parts) (phr) Thickness Layer A (m) 450 450 300 300 300 Layer B (m) 100 100 100 100 100 Layer C (m) 450 450 300 300 300 Concavities Groove Depth (Reg) of 21 20 22 23 22 and concaviting (m) convexities Arrangement interval between 500 500 400 300 180 on surface of concaviting (m) layer A 10-point average 51 50 50 53 52 roughness (Rz) (m) Concavities 10-point average 1.7 1.6 2.3 1.8 1.5 and roughness (Rz) (m) convexities on surface of Desired off layer A on side of layer B Concavities Groove Depth (Reg) of 19 19 21 22 24 and concaviting (m) convexities Arrangement interval between 750 500 400 300 220 on surface of concaviting (m) layer C 10-point average 50 48 48 53 55 roughness (Rz) (m) Concavities 10-point average 1.9 1.7 2.0 1.7 1.6 and roughness (Rz) (m) convexities on surface of Desired off layer C on side of layer B Evaluation of Temperature at which 40 50 60 40 50 60 40 50 60 40 50 60 40 50 60 desorating degradation starts/ C. properties Temperature at 70 70 70 70 70 70 70 70 70 70 70 70 70 70 70 which preliminary compression ends/ C. Baking test (number 0 1 1 0 0 1 0 0 0 0 0 0 0 0 0 of sheath in which bubbles occurred/20 sheets) Evaluation of optical strain Evaluation of occurrence of ghost image Example 6 Example 7 Example 8 Example 9 Example 10 Compounding Deposition Degree of 69 69 69 69 69 of protective butylation layer (mol %) Degree of 30 30 30 30 30 hydroxylation (mol %) Degree of 1 1 1 1 1 acetylation (mol %) Plasticizer 40 40 40 40 40 (parts) (phr) Composition Degree of 66 66 66 66 66 of sound butylation insulating (mol %) layer Degree of 22 22 22 22 22 hydroxylation (mol %) Degree of 12 12 12 12 12 acetylation (mol %) Plasticizer 60 60 60 60 60 (parts) (phr) Thickness Layer A (m) 300 300 300 350 300 Layer B (m) 100 100 100 100 100 Layer C (m) 300 300 300 350 300 Concavities Groove Depth (Reg) of 31 15 17 22 14 and concaviting (m) convexities Arrangement interval between 180 180 300 300 150 on surface of concaviting (m) layer A 10-point average 60 43 34 53 30 roughness (Rz) (m) Concavities 10-point average 1.9 1.2 1.2 1.2 1.0 and roughness (Rz) (m) convexities on surface of Desired off layer A on side of layer B Concavities Groove Depth (Reg) of 33 11 14 23 14 and concaviting (m) convexities Arrangement interval between 220 220 300 300 120 on surface of concaviting (m) layer C 10-point average 62 40 32 55 30 roughness (Rz) (m) Concavities 10-point average 1.8 1.3 1.3 1.2 1.0 and roughness (Rz) (m) convexities on surface of Desired off layer C on side of layer B Evaluation of Temperature at which 40 50 60 40 50 60 40 50 60 40 50 60 40 50 60 desorating degradation starts/ C. properties Temperature at 70 70 70 70 70 70 70 70 70 70 70 70 70 70 70 which preliminary compression ends/ C. Baking test (number 0 0 0 0 0 0 0 0 1 0 0 0 0 1 1 of sheath in which bubbles occurred/20 sheets) Evaluation of optical strain Evaluation of occurrence of ghost image

(64) TABLE-US-00002 TABLE 2 Example 11 Example 12 Example 13 Example 14 Compounding Composition of Degree of butylation 69 68.5 69 70 protective layer (mol %) Degree of hydroxylation 30 31 30.7 29 (mol %) Degree of acetylation 1 0.5 0.3 1 (mol %) Plasticizer (parts) 36 36 37.5 39 (phr) Composition of sound Degree of butylation 66 67.5 71 77.7 insulating layer (mol %) Degree of 24.5 24.5 23 20.8 hydroxylation (mol %) Degree of acetylation 10.5 8 6 1.5 (mol %) Plasticizer (parts) 75 75 76 77 (phr) Thickness Layer A (m) 300 300 300 300 Layer B (m) 100 100 100 100 Layer C (m) 300 300 300 300 Concavities and convexities on surface Groove depth (Reg) of concavities (m) 22 23 22 31 of layer A Arrangement interval between concavities (m) 400 300 180 180 10-point average roughness (Rz) (m) 50 53 52 60 Concavities and convexities on surface of 10-point average roughness (Rz) (m) 2.3 1.8 1.5 1.9 period off layer A on side of layer B Concavities and convexities on surface Groove depth (Reg) of concavities (m) 21 22 24 33 of layer C Arrangement interval between concavities (m) 400 300 220 220 10-point average roughness (Rz) (m) 48 53 55 62 Concavities and convexities on surface of 10-point average roughness (Rz) (m) 2.0 1.7 1.6 1.8 period off layer C on side of layer D Evaluation of desorating properties Temperature at which desoration starts/ C. 40 50 60 40 50 60 40 50 60 40 50 60 Temperature at which preliminary compression 70 70 70 70 70 70 70 70 70 70 70 70 ends/ C. Baking test (number of sheets in which bubbles 0 0 0 0 0 0 0 0 0 0 0 0 occurred/20 sheets) Evaluation of optical strain Evaluation of occurrance of ghost image Comparative Comparative Comparative Comparative example 1 example 2 example 3 example 4 Compounding Composition of Degree of butylation 69 69 69 69 protective layer (mol %) Degree of hydroxylation 30 30 30 30 (mol %) Degree of acetylation 1 1 1 1 (mol %) Plasticizer (parts) 40 40 40 40 (phr) Composition of sound Degree of butylation 66 66 66 66 insulating layer (mol %) Degree of 22 22 22 22 hydroxylation (mol %) Degree of acetylation 12 12 12 12 (mol %) Plasticizer (parts) 60 60 60 60 (phr) Thickness Layer A (m) 300 300 300 300 Layer B (m) 100 100 100 100 Layer C (m) 300 300 300 300 Concavities and convexities on surface Groove depth (Reg) of concavities (m) 22 9 of layer A Arrangement interval between concavities (m) 500 500 10-point average roughness (Rz) (m) 54 35 30 43 Concavities and convexities on surface of 10-point average roughness (Rz) (m) 2.7 1.9 1.0 2.6 period off layer A on side of layer B Concavities and convexities on surface Groove depth (Reg) of concavities (m) 20 8 of layer C Arrangement interval between concavities (m) 750 750 10-point average roughness (Rz) (m) 50 36 32 45 Concavities and convexities on surface of 10-point average roughness (Rz) (m) 2.8 1.8 1.0 2.4 period off layer C on side of layer D Evaluation of desorating properties Temperature at which desoration starts/ C. 40 50 60 40 50 60 40 50 60 40 50 60 Temperature at which preliminary compression 70 70 70 70 70 70 70 70 70 70 70 70 ends/ C. Baking test (number of sheets in which bubbles 0 0 0 6 8 9 6 8 9 4 5 7 occurred/20 sheets) X X X Evaluation of optical strain X Evaluation of occurrance of ghost image X

INDUSTRIAL APPLICABILITY

(65) According to the present invention, it is possible to provide an interlayer film for laminated glass that includes 2 or more resin layers laminated on each other, exhibits excellent deaerating properties in a manufacturing process of laminated glass, and can inhibit the occurrence of ghost images, and to provide laminated glass including the interlayer film for laminated glass.

REFERENCE SIGNS LIST

(66) 1 ONE RECESS RANDOMLY SELECTED 2 RECESS ADJACENT TO ONE RECESS RANDOMLY SELECTED 3 RECESS ADJACENT TO ONE RECESS RANDOMLY SELECTED A INTERVAL BETWEEN RECESS 1 AND RECESS 2 B INTERVAL BETWEEN RECESS 1 AND RECESS 3 10 RESIN LAYER 20 RESIN LAYER HAVING A SURFACE INCLUDING A LARGE NUMBER OF RECESSES AND A LARGE NUMBER OF PROTRUSIONS 21 SURFACE OF RESIN LAYER 20 HAVING A LARGE NUMBER OF RECESSES AND A LARGE NUMBER OF PROTRUSIONS 22 SURFACE OF RESIN LAYER 20 ON THE SIDE THAT CAME INTO CONTACT WITH RESIN LAYER 10 30 RESIN LAYER