JPH0826789A - Intermediate film for laminated glass, production device therefor and its production - Google Patents

Abstract

PURPOSE:To obtain the intermediate film having excellent properties with respect to deaeration at the time of performing the preliminary press adhesion by forming one surface of the intermediate film embosment groups each of which consists of a large number of embosments and which have their respective bottom parts communicated with each other over the whole surface of the film with embossing so that the deaeration resistance of an embosment group located in a near region to the periphery of the film becomes smaller than that of any of the embosment groups in the farther regions from the periphery. CONSTITUTION:In this intermediate film 1, a large number of embosments 2 having their respective prescribed height (h) and length of the base (w) are formed in pitches (p) in at least one of the surface of the film 1 by embossing and the bottom parts 3 of groups of the embosments 2 are communicated with each other over the whole surface of the film 1. The embosments 2 are formed on the surface of the intermediate film 1 by using a recessed mold 4 consisting of a large number of inverted embosments 5 which have the corresponding respective depth (H), length of the upper base (W) and pitches (P) to the respective height (h), length of the base (w) and pitches (p) of the embosments 2. In the intermediate film 1, it is necessary that the deaeration resistance of a group of the embosments 2 located in a near region to the periphery of the film 1 is smaller than that of any of the groups of embosments 2 in the farther regions from the periphery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interlayer film for laminated glass having a surface shape excellent in deaeration, and a manufacturing apparatus therefor,
And the manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, laminated safety glass (hereinafter referred to as "laminated glass") has been widely used for automobiles, constructions, and the like. The laminated glass has an intermediate film formed by forming a transparent and highly flexible adhesive synthetic resin such as a plasticized polyvinyl butyral resin, polyurethane resin, or silicone resin between at least a pair of glasses. It is made by bonding and bonding. In such a laminated glass, when a shock is applied from the outside, the glass portion is damaged, but the interlayer film interposed between the glasses is not easily damaged, and the damaged glass adheres to the interlayer film. Therefore, the glass fragments are less likely to be scattered, and it is possible to prevent the human bodies in a transportation system such as an automobile or a building from being injured by the glass fragments, which is highly safe.

Generally, the above laminated glass is manufactured by precompressing a laminated body in which an intermediate film is interposed between two sheets of glass to deaerate the air remaining between the layers, and then heating and pressing. The main bonding is performed to bond the glass and the intermediate film.

The interlayer film used for the laminated glass is such that the interlayer films do not cause blocking during storage, and the workability when laminating the glass and the interlayer film is good.
There is a strong demand for good degassing during the above-mentioned preliminary pressure bonding.

The above-mentioned various performances required for the interlayer film depend not only on the type of the synthetic resin which is the main component of the interlayer film and on the viscoelastic characteristics, but also on the surface shape of the interlayer film, and under reduced pressure. In order to improve the degassing property during the pre-press bonding, it has been conventionally practiced to provide a large number of fine irregularities called embossing on at least one surface of the intermediate film.

The above-mentioned conventional embossing is formed in a uniform shape on at least one surface of the intermediate film, and the bottom of the embossing is formed so as to communicate with the entire surface of the intermediate film for smoother degassing. Has been done.

However, in the conventional embossing, since every part of the surface of the intermediate film has the same shape, the air can be transported during degassing by pre-pressing under reduced pressure and the embossing is crushed by heating and pressurizing during pre-pressing. On the other hand, every part of the surface of the interlayer film is the same, and the air existing near the peripheral edge of the laminated glass is preferentially degassed, but the part far from the peripheral edge of the laminated glass, that is, the central part of the laminated glass. The air existing in the region close to is long in the degassing path, and before being sufficiently degassed, the peripheral edge adheres to lose the degassing path and tends to remain in the laminated glass as residual air. If air remains in the laminated glass, there is a problem in that the appearance is deteriorated due to foaming during heating or over time, and the penetration resistance, moisture resistance, durability and the like are deteriorated due to changes in adhesive strength.

In order to deal with the above problems, various methods for sufficiently degassing the laminated glass have been studied. For example, in Japanese Patent Laid-Open No. 3-75246, a thermoplastic intermediate resin is used between a pair of glass plates. When manufacturing a laminated body with a film interposed, a peripheral edge of the laminated body is sucked, and a laminated glass is adhered by sequentially pressing outward from the center of the surface of the laminated body to increase the pressure. And its device have been proposed.

However, the method for adhering laminated glass according to the above proposal requires a special adhering device having a large number of pressure chambers, and it is necessary to press the layers sequentially outward from the center of the surface of the laminate to pressurize them. However, there is a problem that the bonding work is complicated and the workability is not good.

[0010]

In order to solve the above-mentioned conventional problems, the present invention provides an interlayer film for laminated glass which is excellent in deaeration during pre-press bonding, a manufacturing apparatus therefor, and a manufacturing method therefor. With the goal.

[0011]

An intermediate film for laminated glass according to the invention of claim 1 (hereinafter referred to as "first invention") has a large number of bottoms which communicate with at least one surface. In the interlayer film for laminated glass in which the embossing is formed, the degassing resistance of the embossing group located closer to the peripheral portion of the interlayer film is smaller than that of the embossing group located closer to the peripheral portion. The above object is achieved by that.

The invention according to claim 2 (hereinafter, referred to as "second
The invention relates to an apparatus for producing an interlayer film for laminated glass according to the invention "), wherein the embossing group located closer to the peripheral portion of the interlayer film has a smaller degassing resistance than the embossing group located closer to the peripheral portion. Is provided with a concave mold having a large number of reversible embossments capable of transferring the above-mentioned object, whereby the above object is achieved.

Further, the invention according to claim 3 (hereinafter,
In the method for producing an interlayer film for laminated glass according to the "third invention"), the degassing resistance of the embossing group located closer to the peripheral portion of the interlayer film is smaller than that of the embossing group located closer to the peripheral portion. It is characterized in that the emboss is formed on the surface of the resin film by using a concave mold having a large number of reverse embosses capable of transferring such emboss, thereby achieving the above object.

The interlayer film for laminated glass according to the first invention is
A transparent adhesive synthetic resin is formed into a film, and a large number of embosses whose bottoms communicate with the entire surface are formed on the surface of at least one surface of the synthetic resin, and the embossing is located at a position far from the peripheral edge of the intermediate film. The degassing resistance is smaller in the embossing group located closer to the embossing group.

The kind of the above-mentioned adhesive synthetic resin is not particularly limited, but examples thereof include polyvinyl butyral resin, polyvinyl formal resin, polyvinyl acetal resin, ethylene-vinyl acetate copolymer resin, polyurethane resin, silicone resin and the like. Among them, a polyvinyl butyral resin having a polymerization degree of about 1000 to 2000 and a butyralization degree of about 50 to 70 mol%, which is plasticized by containing a plasticizer, is more preferably used.

The type of the plasticizer is not particularly limited, but triethylene glycol-di-2-
Ethyl butyrate, triethylene glycol-di-2-
Monobasic acid ester-based plasticizers such as ethylhexoate, triethylene glycol-dicaproate, and triethylene glycol-di-n-octoate, and polybasic acid ester-based plasticizers such as dibutyl sebacate, dioctyl azelate, and dibutyl carbitol adipate. Agents and the like, and one or more of these are preferably used.

The content of the plasticizer is not particularly limited, but is preferably 30 to 70 parts by weight with respect to 100 parts by weight of the polyvinyl butyral resin. If the content of the plasticizer is less than 30 parts by weight with respect to 100 parts by weight of the polyvinyl butyral resin, the laminated glass produced using the obtained interlayer film will have insufficient penetration resistance, and conversely the content of the plasticizer will be insufficient. If it exceeds 70 parts by weight, the plasticizer bleeds from the resulting intermediate film, and the adhesion to glass and the transparency of laminated glass deteriorate.

The interlayer film for laminated glass according to the first aspect of the present invention may optionally contain an ultraviolet absorber, a light stabilizer, an antioxidant, an adhesion modifier, and a surfactant as long as the object of the present invention is not impaired. , Various additives such as colorants may be contained.

The method for forming the above-mentioned intermediate film is not particularly limited. For example, a mixture containing a polyvinyl butyral resin, a plasticizer, and optionally other additives is uniformly kneaded and then extruded. A conventionally known method of forming a film in a sheet form may be performed by a molding method, a calendar molding method, a press molding method, or the like.

The thickness of the intermediate film is not particularly limited, but is preferably about 0.1 to 1 mm, and more preferably about 0.3 to 0.8 mm. .

The interlayer film for laminated glass according to the first invention is
A large number of embossed bottoms are formed on at least one surface, and the embossed groups located closer to the peripheral edge of the interlayer are more resistant to degassing. Must be small. Here, the embossing group means an embossing group existing within a certain area of the interlayer film.

The interlayer film for laminated glass according to the first aspect of the present invention will be specifically described below with reference to the drawings. 1A is a partial cross-sectional view of the surface of the interlayer film, and FIG. 1B is a partial cross-sectional view of the concave surface. 2 is a sectional view of the concave surface from one end to the other.

As shown in FIG. 1 (a), the interlayer film 1 for laminated glass according to the first invention has an embossment 2 having a predetermined height h and a base length w on at least one surface.
Are formed at intervals (pitch) p, and the bottom 3 of the emboss 2 communicates with the entire surface of the intermediate film 1. As shown in FIG. 1B, the embossing 2 of the intermediate film has a depth h corresponding to the height h, the bottom length w and the interval p of the embossing 2, the upper side length W and the interval (pitch). With the concave mold 4 having a large number of reverse embosses 5 provided with P,
It is formed on the surface of the intermediate film 1.

In the intermediate film 1 according to the first aspect of the present invention, the degassing resistance of the embossing group 2 located closer to the embossing group 2 located closer to the peripheral edge of the intermediate film 1 is smaller. Need to be present.

Here, the embossing 2 located closer to the group of embossing 2 located farther from the peripheral edge of the intermediate film 1.
The fact that the group has a smaller degassing resistance means that, specifically, the embossing 2 group located closer to the peripheral portion of the intermediate film 1 than the embossing 2 group located closer to Continuously or intermittently, one or two or more of a higher height h, a longer base length w, and a narrower interval p is set to indicate that deaeration resistance is made small.

The embossing group 2 located closer to the peripheral portion of the intermediate film 1 than the embossing group 2 located closer to the peripheral portion continuously or intermittently has a higher height h and a longer base length w. As shown in FIG. 2, in a concave mold 4 having a large number of reversal embosses 5, a method of setting one or more of the narrower intervals p in a region far from the peripheral edge of the interlayer film. The depth HA of the reverse embossing 5 group provided at the corresponding position, the depth HA of the reverse embossing 5 group provided at the position closer to the peripheral portion of the interlayer film from the depth HO, the upper side length WO, and the interval PO, HA ', upper side length W
A, WA 'and the intervals PA, PA' should be one or two or more continuously or intermittently with a deeper depth, a longer upper side length, and a narrower interval. By doing so, it is possible to obtain an intermediate film in which a large number of desired embossments are formed on at least one surface.

As described above, the embossing group located closer to the embossing group located farther from the peripheral portion of the interlayer film has a higher height, a longer base length, and a narrower interval. By reducing the degassing resistance to one or two or more, pre-compression bonding under reduced pressure when producing a laminated glass, a portion far from the peripheral edge of the laminated glass, that is, close to the central portion of the laminated glass Air existing in the part can be smoothly degassed, and high quality laminated glass with almost no residual air can be obtained.

In the apparatus for producing an interlayer film for laminated glass according to the second aspect of the present invention, the degassing resistance of the embossing group located closer to the peripheral portion of the interlayer film is smaller than that of the embossing group located closer to the peripheral portion. It is necessary to have a recess with multiple inverted embosses that can transfer the emboss.

Further, in the method for manufacturing an interlayer film for laminated glass according to the third aspect of the invention, the degassing resistance of the embossing group located closer to the peripheral portion of the interlayer film is smaller than that of the embossing group located closer to the peripheral portion. It is necessary to form the emboss on the surface of the resin film by using a concave mold having a large number of reverse embosses capable of transferring such emboss.

The apparatus for producing an interlayer film for laminated glass according to the second invention and the method for producing an interlayer film for laminated glass according to the third invention will be specifically described below with reference to the drawings. FIG.
FIG. 4 is an explanatory view showing an example of an apparatus for producing an interlayer film for laminated glass according to the second invention, and FIGS. 4, 5 and 6 show the second embodiment.
It is explanatory drawing showing the other example of the manufacturing apparatus of the intermediate film for laminated glasses by invention. FIG. 7 is a perspective view showing an example of an embodiment of a method for producing an interlayer film for laminated glass according to the third invention, which is performed using the production apparatus of FIG.

The apparatus for producing an interlayer film for laminated glass according to the second aspect of the present invention is, for example, as shown in FIG. 3, both end portions A and A'located at points that pass through the midpoint O and are symmetrical with the midpoint O sandwiched therebetween.
Any of the lines A-A 'that connect the two are provided with a concave mold 4 having a large number of reverse embossed 5 distributions of the cross-section as shown in FIG. 2, for example by means of a heater 6 having a heater switch 7. It is possible to heat,
For example, the support frame 8 horizontally supports the reverse embossment 5 as an upper surface. The material of the concave mold 4 is not particularly limited, but for example, a metal thin plate having appropriate elasticity is preferably used.

Further, the concave mold 4 provided in the apparatus for manufacturing an interlayer film for laminated glass according to the second invention is not limited to the horizontally supported concave mold 4, and for example, FIG.
, A heatable roll 9 having on its surface a reverse embossing 5 distribution with a cross section as shown for example in FIG.
It may be concave.

When the embossing 2 is formed on only one surface of the intermediate film 1, the horizontally supported concave mold 4 or roll-shaped concave mold corresponds to the surface of the intermediate film 1 to which the embossing 2 is applied. It suffices to have the predetermined reverse embossing 5 only on the surface.

When the embossing 2 is formed on both surfaces of the intermediate film 1, for example, as shown in FIG. 4, a heatable lower concave mold 41 having a predetermined reverse embossing 5 and a predetermined reverse embossing 5 are provided. And a heatable upper concave mold 42 having a lower concave mold 41 and / or an upper concave mold 42 that can be moved up and down by the movable arm 10 or the like, or, for example, as shown in FIG. Further, a manufacturing apparatus provided with two roll-shaped concave molds having a predetermined reverse embossing 5 may be used.

The depth H, the upper side length W, and the interval P of the reverse embossing 5 of the lower concave mold 41 and the upper concave mold 42 or the two roll 9 concave concave molds may be the same or may be different. Is also good.

In the method for producing an interlayer film for laminated glass according to the third aspect of the invention, for example, as shown in FIG. 7, a resin film 11 formed in advance by a conventional method is used, and a reverse emboss 5 having a predetermined middle point o is provided. It was placed on the lower concave mold 41 so as to coincide with the middle point O of the lower concave mold 41, and the vertically movable upper concave mold 42 having a predetermined reverse embossing 5 was lowered and brought into contact with the upper surface of the resin film 11. After that, a predetermined emboss is formed on the upper and lower surfaces of the resin film 11 by pressure bonding at a predetermined temperature, pressure and time. At this time, the reverse emboss 5 is formed on the surface of either the lower concave mold 41 or the upper concave mold 42.
If not provided, an intermediate film having a predetermined emboss formed on only one surface can be obtained.

The temperature, pressure and time at the time of pressure bonding vary depending on the kind of the resin which is the main component of the resin film 11 and are not particularly limited, but a plasticized polyvinyl butyral resin is formed into a film. In the case of the resin film 11, it is preferable that the temperature is about 130 to 170 ° C., the pressure is about 3 to 30 kg / cm ² , and the time is about 0.02 to 10 seconds.
Further, it is preferable to preheat the resin film 11 itself to a temperature lower by at least about 10 ° C. than the pressure bonding temperature by a heating device such as a heating roll before the pressure bonding.

The interlayer film for laminated glass having the predetermined emboss formed on one side or both sides thereof is inserted between at least a pair of glasses, pre-pressed under reduced pressure by a conventional method, and then heated by a conventional method. A desired laminated glass is formed by performing final pressure bonding under pressure.

[0039]

In the interlayer film for laminated glass according to the first aspect of the present invention, at least one surface has a large number of embosses whose bottoms communicate over the entire surface, and is located at a position far from the peripheral edge of the interlayer film. Since the degassing resistance of the embossing group, which is located closer to the embossing group, is smaller, the part farther from the peripheral edge of the laminated glass during preliminary degassing when the laminated glass is produced using the interlayer film. , That is,
The air existing near the center of the laminated glass is smoothly degassed. Therefore, it is possible to obtain a high quality laminated glass with almost no residual air.

According to the method for producing an intermediate film for laminated glass according to the third aspect of the present invention, which is performed using the apparatus for producing an intermediate film for laminated glass according to the second aspect of the present invention, the intermediate film for laminated glass having the predetermined emboss is formed. Can be easily obtained.

[0041]

EXAMPLES In order to explain the present invention in more detail, examples will be given below.

(Example 1)

( 1) Preparation of interlayer film for laminated glass Thickness of 800 μm formed by plasticizing polyvinyl butyral resin film, long side 1000 mm, short side 600 mm
As shown in FIG. 7, the resin film of No. 2 has a long side of 2000 mm and a short side of 1600 m on which a predetermined reverse embossing 5 is engraved.
m on the lower concave mold 41, the middle point o of the resin film 11 is the lower concave mold 41.
After being placed so as to coincide with the middle point O, the upper concave mold 42 having the reverse embossing 5 similar to the lower concave mold 41 is lowered to be brought into contact with the surface of the resin film 11, and the temperature of the resin film 11
0 ℃, the temperature of the upper and lower concave molds 42 and 41 is 150 ℃, the pressure is 5kg
/ Cm ² was pressure-bonded for 0.05 seconds to prepare an interlayer film for laminated glass having predetermined embosses formed on both upper and lower surfaces.

At this time, in the lower concave mold 41, the reverse emboss 5 located at the midpoint O of the lower concave mold 41 is set to have a depth of 20 μm, an upper side length of 20 μm, and an interval of 300 μm.
The reverse emboss 5 distribution with respect to the apex B of the lower concave mold 41 is engraved on the entire surface of the lower concave mold 41 so that this distribution is point-symmetrical about the midpoint O. Met. In addition, the upper concave mold 42 was also one in which the reverse embossing 5 similar to the lower concave mold 41 was stamped on the entire surface. H (x) = 0.03x + 20 W (x) = 0.05x + 20 P (x) =-0.135x + 300 where x is from the midpoint O on the axis connecting the midpoint O of the lower concave mold 41 and the vertex B. Indicates distance (mm), H (x), W (x)
And P (x) are the depth (μ
m), the upper side length (μm) and the interval (μm).

According to the above equation, the greatest difference from the reverse embossing 5 located at the midpoint O of the lower concave mold 41 is the reverse embossing 5 located at the apex B of the lower concave mold 41, and its depth is 58 μm, upper side length is 84 μm, spacing is 127 μm
Met.

( 2) Preparation of Laminated Glass The intermediate film having predetermined embosses formed on both upper and lower surfaces obtained above was placed on glass at room temperature immediately after forming the emboss, and the temperature of the intermediate film was 40 ° C. or lower. At that time, glass at room temperature was laminated on the interlayer film and inserted into a vacuum bag.
Then, suction and deaeration from the suction port of the vacuum bag for 500m
The pressure was reduced to mHg, and the temperature was raised to 80 ° C. for 5 minutes under this reduced pressure, and then the pressure was maintained at 80 ° C. for 10 minutes while continuing suction and deaeration to perform preliminary pressure bonding. Then, vacuum the bag at 50 ℃
After cooling to the following, the reduced pressure was released, the laminate was taken out from the vacuum bag, and a laminated glass semi-finished product was produced. Then, the obtained laminated glass semi-finished product was heated and pressed by an ordinary method in an autoclave to perform main compression bonding to produce a laminated glass.

( 3) Evaluation The embossing dimension of the interlayer film obtained above, the visible light transmittance of the semi-finished laminated glass product, the transparency of the peripheral portion, and the heat resistance of the laminated glass were evaluated by the following methods. The evaluation results are as shown in Table 1.

Embossing dimension : Height of the embossing located near the midpoint and the apex of the intermediate film obtained above (μ
m), the base length (μm) and the interval (μm) were measured with a three-dimensional roughness meter. The measurement was performed at each n = 9, and the average value was calculated.

Visible Light Transmittance : The visible light transmittance (%) near the midpoint of the semi-finished laminated glass product obtained above is determined by JI.
It was measured in accordance with SR-3212 "Test method for safety glass for automobiles". The measurement was performed at n = 9 and the average value was calculated.

Transparency of the peripheral portion : The width (mm) of the transparent portion from the periphery was measured for the long side portion and the short side portion of the laminated glass semi-finished product obtained above. The measurement was performed at n = 9 and the average value was calculated.

Heat resistance : In accordance with JIS R-3205 "Laminated glass", 20 sheets of the laminated glass obtained above were left in an atmosphere of 120 ° C. for 2 hours, then taken out and visually observed for the presence or absence of foaming. The heat resistance (the number of foams) was determined by the number of foams recognized.

(Example 2)

In the production of an interlayer film for laminated glass, a resin film having a width of 800 mm formed by forming a plasticized polyvinyl butyral resin is stamped with a predetermined reverse emboss 5 on the entire outer peripheral surface as shown in FIG. Width 2600m
The two rolls of m-shaped concave die are passed so that the midpoint of the resin film in the width direction and the midpoint O of the width of the roll coincide with each other, and the embossing and the winding of the intermediate film are performed at the same time. An 800 μm-thick interlayer film for laminated glass having predetermined embosses formed on the upper and lower surfaces was produced. At this time, the temperature of the resin film was 130 ° C., the surface temperature of the roll 9 concave mold was 150 ° C., and the contact time between the resin film and the roll 9 concave mold was 0.08 seconds.

At this time, in the two roll-shaped concave molds, the reverse embossment 5 located at the midpoint O in the width direction of the roll-shaped concave mold has a depth of 20 μm, an upper side length of 20 μm, and an interval of 3 μm.
It is set to 00 μm and the center point O of the width direction of the concave shape of the roll 9
The reverse embossment 5 distribution between the two ends A and A ′ is defined by the following expression, and the reverse embossment 5 of this distribution is engraved on the entire outer peripheral surface of the roll 9 concave shape. H (x) = 0.03x + 20 W (x) = 0.05x + 20 P (x) = − 1.35 × 10 ⁻⁴ x ² +300 where x is the center point O in the width direction of the roll-shaped concave die and both ends. A represents the distance (mm) from the midpoint O on the axis connecting A and A ′, and H (x), W (x) and P (x) are the depth (μm) of the reverse embossing 5 at the x point, The upper side length (μm) and the interval (μm) are shown.

According to the above equation, the greatest difference from the reverse embossing 5 located at the midpoint O in the width direction of the roll 9 concave die is at the widthwise ends A and A'of the roll 9 concave die. The reverse embossing 5 was positioned, the depth thereof was 59 μm, the upper side length was 85 μm, and the interval was 72 μm.

The interlayer film for laminated glass obtained above was unwound and cut into a long side of 1000 mm and a short side of 600 mm excluding 100 mm at both ends, and a semi-finished laminated glass product and a laminated glass were prepared in the same manner as in Example 1. It was made.

(Comparative Example 1)

The same as Example 1 except that the dimensions of the reverse embossing engraved on the entire surface of the lower concave type and the upper concave type were uniformly set to 20 μm for the depth, 20 μm for the upper side length, and 300 μm for the spacing without changing. Then, the interlayer film for laminated glass, the semi-finished product of laminated glass, and the laminated glass were produced.

(Comparative Example 2)

The same as Example 1 except that the dimensions of the reverse embossing stamped on the entire surface of the lower concave type and the upper concave type were uniformly set to 38 μm for the depth, 50 μm for the upper side length, and 220 μm for the spacing, without changing. Then, the interlayer film for laminated glass, the semi-finished product of laminated glass, and the laminated glass were produced.

(Comparative Example 3)

The reverse embossing, which is stamped on the entire outer peripheral surface of the two roll-shaped concave molds, has a uniform size without changing the depth of 20 μm, the upper side length of 20 μm, and the interval of 300 μm.
An interlayer film for laminated glass, a laminated glass semi-finished product, and a laminated glass were produced in the same manner as in Example 2 except that the above was set.

(Comparative Example 4)

The film is made of plasticized polyvinyl butyral resin, and the height is 30 μm over the entire upper and lower surfaces.
Semi-finished laminated glass and laminated glass were produced in the same manner as in Example 1 except that an interlayer film for laminated glass in which embossments each having a length of 40 m and a base length of 40 m were regularly formed at intervals of 165 m was used.

The results of evaluating the performances of the interlayer film for laminated glass, the laminated glass semi-finished product and the laminated glass obtained in Example 2 and Comparative Examples 1 to 4 in the same manner as in Example 1 are as shown in Table 1. It was

[0066]

[Table 1]

[0067]

As described above, in the interlayer film for laminated glass according to the first invention, the degassing resistance of the embossing group located near the peripheral portion is smaller than that of the embossing group located near the central portion. The laminated glass produced by using the intermediate film is smoothly deaerated during the pre-compression bonding and has a high quality with almost no residual air.

According to the method for producing an intermediate film for laminated glass according to the third aspect of the present invention, which is performed using the apparatus for producing an intermediate film for laminated glass according to the second aspect, the intermediate film for laminated glass having the predetermined emboss is formed. Can be easily obtained.

[0069]

[Brief description of drawings]

FIG. 1A is a partial cross-sectional view of an interlayer film surface,
FIG. 1B is a partial cross-sectional view of the concave surface.

FIG. 2 is a cross-sectional view of a concave surface from one end to the other end.

FIG. 3 is an explanatory diagram showing an example of an intermediate film manufacturing apparatus.

FIG. 4 is an explanatory view showing another example of an intermediate film manufacturing apparatus.

FIG. 5 is an explanatory view showing another example of an intermediate film manufacturing apparatus.

FIG. 6 is an explanatory diagram showing another example of an intermediate film manufacturing apparatus.

FIG. 7 is a perspective view illustrating an example of an aspect of a method for manufacturing an intermediate film.

[Explanation of symbols]

 1 Intermediate Film 2 Embossing 3 Bottom of Embossing 4 Concave Type 41 Lower Recessing Type 42 Upper Recessing Type 5 Reverse Embossing 6 Heater 7 Heater Switch 8 Support Frame 9 Roll 10 Movable Arm 11 Resin Film o Middle Point of Resin Film h Embossing Height w Embossing Bottom length of p p Embossing interval (pitch) O concave or roll midpoint A, A'concave or roll end B concave concave apex H reverse embossing depth W reverse embossing top length P reverse embossing interval (pitch)

[Procedure amendment]

[Submission date] December 1, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

FIG. 1 is a partial cross-sectional view of an intermediate film surface in the upper view of FIG.
The figure below is a partial cross-sectional view of the concave surface.

Claims (3)

[Claims] 1. An intermediate film for laminated glass, wherein at least one surface has a large number of embosses whose bottoms communicate over the entire surface, the embossing group being located at a position far from the peripheral edge of the intermediate film. An interlayer film for laminated glass, which is characterized in that the embossed groups located closer to each other have smaller degassing resistance. 2. A concave type having a large number of reversal embosses capable of transferring embosses such that degassing resistance is smaller in an embossing group located closer to an embossing group located farther from a peripheral portion of an intermediate film. An apparatus for producing an interlayer film for laminated glass, comprising: 3. A concave type having a large number of reversing embosses capable of transferring embossing such that degassing resistance is smaller in an embossing group located closer to an embossing group located farther from a peripheral portion of an intermediate film. Is used to form embosses on the surface of a resin film, which is a method for producing an interlayer film for laminated glass.