JP2012006792A - Interlayer for laminated glass, method for producing the same, and laminated glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing an interlayer for laminated glass obtainable of the interlayer for laminated glass in which appearance non-uniformity is suppressed and patterns are hard to be visible when light is transmitted.SOLUTION: In this method for producing an interlayer 1 for laminated glass, a first layer 2 and a second layer 3 are laminated. The method for producing the interlayer 1 for laminated glass includes a step of obtaining the interlayer 1 for laminated glass by laminating the first layer 2 and the second layer 3 using the first layer 2 containing a thermoplastic resin and the second layer 3 containing a thermoplastic resin and inorganic particles and whose average roughness Rz at ten points on the surface 3a prior to lamination, where the first layer 2 and the second layer 3 are to be laminated, is equal to or smaller than 15 μm.

Description

  The present invention relates to a method for producing an interlayer film for laminated glass comprising a layer containing inorganic particles and a layer different from the layer containing the inorganic particles, and a laminated glass obtained by the method for producing an interlayer film for laminated glass. The present invention relates to an interlayer film and a laminated glass provided with the interlayer film for laminated glass.

  Laminated glass is widely used in automobiles, railway vehicles, aircraft, ships, buildings, and the like. As the laminated glass, there is a colored laminated glass. Colored laminated glass is used in applications requiring privacy protection, such as daylighting windows, bathroom doors, and veranda waistboards.

  The colored laminated glass is manufactured, for example, by sandwiching a colored intermediate film between a pair of transparent glass plates.

  As an example of the colored intermediate film, Patent Document 1 below proposes a colored intermediate film in which opacifying agents such as calcium carbonate or silica are dispersed in a thermoplastic resin. This colored intermediate film is produced by dispersing an opacifier in a thermoplastic resin and then molding it.

Japanese Examined Patent Publication No. 2-56295

  Since the colored intermediate film described in Patent Document 1 is colored with an opacifier, the light transmission amount of the colored laminated glass using the colored intermediate film can be relatively reduced. Furthermore, when the person or object is viewed through the colored laminated glass, the visibility of the person or object can be lowered.

  By the way, a multilayer interlayer film having a laminated structure of two or more layers is known as an interlayer film used for the laminated glass. If the colored intermediate film described in Patent Document 1 is laminated with another intermediate film, uneven appearance may occur when light is transmitted through the obtained multilayer intermediate film or a laminated glass using the multilayer intermediate film. It is easy to occur and a pattern may be visually recognized.

  An object of the present invention is to provide a method for producing an interlayer film for laminated glass, which can suppress appearance unevenness when light is transmitted, and which makes it difficult to visually recognize a pattern, and the interlayer film for laminated glass It is providing the laminated glass provided with the intermediate film for laminated glasses obtained by this manufacturing method, and this intermediate film for laminated glasses.

  According to a wide aspect of the present invention, there is provided a method for producing an interlayer film for laminated glass in which a first layer and a second layer are laminated, using the first layer containing a thermoplastic resin, and Using a second layer containing a thermoplastic resin and inorganic particles and having a ten-point average roughness Rz of 15 μm or less on the surface on which the first layer of the second layer before lamination is laminated, There is provided a method for producing an interlayer film for laminated glass, comprising a step of obtaining an interlayer film for laminated glass by laminating the first layer and the second layer.

  In a specific aspect of the interlayer film for laminated glass according to the present invention, the ten-point average roughness Rz of the surface on which the second layer of the first layer before lamination is laminated, and the second before lamination. The first and second layers having an absolute value of the difference from the ten-point average roughness Rz of the surface on which the first layer is laminated of 15 μm or more are used.

  In another specific aspect of the interlayer film for laminated glass according to the present invention, when manufacturing the interlayer film for laminated glass in which the first layer, the second layer, and the third layer are laminated in this order, A second layer containing a thermoplastic resin and inorganic particles and having a ten-point average roughness Rz of 15 μm or less on both sides of the second layer before lamination using the first layer containing the thermoplastic resin. By laminating the first layer, the second layer, and the third layer in this order using a layer and a third layer containing a thermoplastic resin, for laminated glass A step of obtaining an interlayer film is provided.

  In still another specific aspect of the interlayer film for laminated glass according to the present invention, the ten-point average roughness Rz of the surface on which the second layer of the first layer before lamination is laminated, and the above before lamination. The absolute value of the difference from the ten-point average roughness Rz of the surface on which the first layer of the second layer is laminated is 15 μm or more, and the third layer of the second layer before lamination is The absolute value of the difference between the ten-point average roughness Rz of the surface to be laminated and the ten-point average roughness Rz of the surface of the third layer before the lamination on which the second layer is laminated is 15 μm or more. First to third layers are used.

  In another broad aspect of the present invention, a method for producing an interlayer film for laminated glass in which a first layer and a second layer are laminated, using the first layer containing a thermoplastic resin, Ten-point average roughness Rz of the surface on which the second layer of the first layer before lamination is laminated using the second layer containing the thermoplastic resin and inorganic particles, and before lamination Using the first and second layers, the absolute value of the difference from the ten-point average roughness Rz of the surface on which the first layer of the second layer is laminated is 15 μm or more, and the first layer A method for producing an interlayer film for laminated glass is provided, which includes a step of obtaining an interlayer film for laminated glass by laminating the second layer and the second layer.

  Further, in a specific aspect of the interlayer film for laminated glass according to the present invention, when manufacturing the interlayer film for laminated glass in which the first layer, the second layer, and the third layer are laminated in this order. Using the first layer containing the thermoplastic resin, using the second layer containing the thermoplastic resin and the inorganic particles, using the third layer containing the thermoplastic resin, and before the lamination Ten-point average roughness Rz of the surface of the first layer on which the second layer is laminated, and Ten-point average roughness Rz of the surface of the second layer on which the first layer is laminated before lamination. The absolute value of the difference between the tenth point average roughness Rz of the surface on which the third layer of the second layer before lamination is laminated, and the third layer before lamination is Using the first to third layers whose absolute value of the difference from the ten-point average roughness Rz of the surface on which the second layer is laminated is 15 μm or more, the first layer and the above A step of obtaining an interlayer film for laminated glass by laminating the second layer and the third layer in this order is provided.

  In another specific aspect of the interlayer film for laminated glass according to the present invention, inorganic particles are dispersed in a plasticizer to obtain a dispersion, and then the obtained dispersion and a thermoplastic resin are mixed to obtain thermoplasticity. A step of preparing a second layer forming composition containing a resin, a plasticizer and inorganic particles, and a second layer containing a thermoplastic resin, a plasticizer and inorganic particles using the second layer forming composition. A step of obtaining two layers.

  In another specific aspect of the method for producing an interlayer film for laminated glass according to the present invention, calcium carbonate is used as the inorganic particles.

  The interlayer film for laminated glass according to the present invention is an interlayer film for laminated glass obtained by the method for producing an interlayer film for laminated glass.

  The laminated glass according to the present invention includes an interlayer film for laminated glass configured according to the present invention and first and second laminated glass constituent members, and the interlayer film for laminated glass includes the first and second interlayer films. It is sandwiched between laminated glass components.

  In the method for producing an interlayer film for laminated glass according to the present invention, the first layer containing the thermoplastic resin, the thermoplastic resin and the inorganic particles, and the first layer of the second layer before lamination are laminated. Since the first layer and the second layer are laminated using the second layer having a ten-point average roughness Rz of 15 μm or less, the appearance unevenness is suppressed, An interlayer film for laminated glass can be obtained in which the pattern is difficult to be visually recognized when permeating.

  In another method for producing an interlayer film for laminated glass according to the present invention, the first layer containing the thermoplastic resin and the second layer containing the thermoplastic resin and the inorganic particles are laminated. The ten-point average roughness Rz of the surface on which the second layer of the first layer before the lamination is laminated, and the ten-point average of the surface on which the first layer of the second layer before the lamination is laminated Since the absolute value of the difference from the roughness Rz is 15 μm or more, the appearance unevenness is suppressed, and it is possible to obtain an interlayer film for laminated glass in which a pattern is hardly visually recognized when light is transmitted.

FIG. 1 is a partially cutaway sectional view showing an interlayer film for laminated glass obtained by the method for manufacturing an interlayer film for laminated glass according to one embodiment of the present invention. FIG. 2 is a partially cutaway sectional view showing an example of laminated glass using the interlayer film for laminated glass shown in FIG.

  Details of the present invention will be described below.

(Interlayer film for laminated glass)
FIG. 1 shows a partially cutaway sectional view of an interlayer film for laminated glass obtained by the method for producing an interlayer film for laminated glass according to one embodiment of the present invention.

  The intermediate film 1 shown in FIG. 1 includes a first layer 2, a second layer 3 laminated on the surface 2 a of the first layer 2, and a first layer 2 of the second layer 3. And a third layer 4 laminated on the other surface 3b opposite to the one surface 3a. The intermediate film 1 is used to obtain a laminated glass. The intermediate film 1 is an intermediate film for laminated glass.

  The second layer 3 includes a thermoplastic resin, a plasticizer, and a plurality of inorganic particles 5. The intermediate film 1 does not include the second layer 3 containing inorganic particles on both surfaces.

  Since the second layer 3 includes the inorganic particles 5, it is generally a colored layer. The second layer 3 is preferably colored, and is preferably a colored layer. The second layer 3 is more preferably milky white and more preferably a milky white layer. The first and third layers 2 and 4 contain a thermoplastic resin. Each of the first and third layers 2 and 4 is preferably transparent, and is preferably a transparent layer. Each of the first and third layers 2 and 4 may include inorganic particles 5.

  The intermediate film 1 has a three-layer structure in which a first layer 2, a second layer 3 containing inorganic particles, and a third layer 4 are laminated in this order. Thus, the second layer 3 containing the inorganic particles 5 is preferably sandwiched between the first and third layers 2 and 4. In this case, the laminated glass constituent member can be firmly bonded to both surfaces of the intermediate film 1. However, the third layer 4 is not necessarily used. That is, the first layer 2 may be laminated only on one surface 3 a of the second layer 3 including the inorganic particles 5. In this case, another layer is not laminated on the other surface 3b of the second layer 3, and a layer containing inorganic particles is not laminated. In this case, the other surface 3b of the second layer 3 is a layer on which laminated glass constituent members are laminated. Further, the intermediate film may have a laminated structure of four layers or more.

  The thickness of the intermediate film is not particularly limited. The thickness of the intermediate film indicates the total thickness of each layer constituting the intermediate film. Therefore, in the case of the intermediate film 1, the thickness of the intermediate film 1 indicates the total thickness of the first to third layers 2 to 4. From the viewpoint of practical use, and from the viewpoint of sufficiently improving penetration resistance and weather resistance, the thickness of the intermediate film is preferably in the range of 0.1 to 5 mm. A more preferable lower limit of the thickness of the intermediate film is 0.25 mm, and a more preferable upper limit is 1.5 mm. If the thickness of the intermediate film is too thin, the penetration resistance or weather resistance of the laminated glass may be lowered.

(Method for producing interlayer film for laminated glass)
In the method for producing an interlayer film for laminated glass according to the present embodiment for obtaining the interlayer film 1, first, a first layer 2 containing a thermoplastic resin, and a second layer 3 containing a thermoplastic resin and inorganic particles. And a third layer 4 containing a thermoplastic resin.

  Each of the first to third layers 2 to 4 comprises a first layer forming composition containing a thermoplastic resin, a second layer forming composition containing a thermoplastic resin and inorganic particles, and a thermoplastic resin. It can form with the 3rd composition for layer formation containing.

  The said 1st-3rd layer forming composition can be obtained by knead | mixing each component using an extruder, a plastograph, a kneader, a Banbury mixer, a calender roll, etc., for example. The first to third layers 2 to 4 can be obtained by forming the obtained first to third layer forming compositions, respectively. As a method for forming the first to third layers 2 to 4, conventional film forming methods such as an extrusion method, a calendering method, and a pressing method are used.

  In the present embodiment, the first to third layers 2 to 4 obtained as described above are used. That is, the first layer 2 containing a thermoplastic resin, the second layer 3 containing a thermoplastic resin and inorganic particles, and the third layer 4 containing a thermoplastic resin are used.

  The ten-point average roughness Rz of one surface 3a on which the first layer 2 of the second layer 3 before lamination is laminated is 15 μm or less. The ten-point average roughness Rz of the other surface 3b on which the third layer 4 of the second layer 3 before lamination is laminated is 15 μm or less. Thus, it is preferable that the 10-point average roughness Rz of one surface 3a and the other surface 3b of the second layer 3, that is, the surfaces on both sides of the second layer 3, is 15 μm or less.

  Ten-point average roughness Rz of the surface 2a on which the second layer 3 of the first layer 2 before lamination is laminated, and one surface on which the first layer 2 of the second layer 3 before lamination is laminated The absolute value of the difference from the 10-point average roughness Rz of 3a is 15 μm or more. Ten-point average roughness Rz of the other surface 3b on which the third layer 4 of the second layer 3 before lamination is laminated, and the surface on which the second layer 3 of the third layer 4 before lamination is laminated The absolute value of the difference from the 10-point average roughness Rz of 4a is 15 μm or more. Thus, it is preferable that the absolute value of the difference between the ten-point average roughness Rz of the surface 2a and the ten-point average roughness Rz of one surface 3a is 15 μm or more, and the ten-point average roughness of the other surface 3b. The absolute value of the difference between the thickness Rz and the ten-point average roughness Rz of the surface 4a is preferably 15 μm or more.

  The ten-point average roughness Rz can be determined by a measuring method based on JIS B0601-1994.

  The main feature of this embodiment is that the 10-point average roughness Rz of the surfaces on both sides of the second layer 3 before lamination is 15 μm or less, or the surface 2a of the first layer 2 before lamination. The absolute value of the difference between the ten-point average roughness Rz and the ten-point average roughness Rz of one surface 3a of the second layer 3 before stacking is 15 μm or more, and the second layer 3 before stacking The absolute value of the difference between the ten-point average roughness Rz of the other surface 3b and the ten-point average roughness Rz of the surface 4a of the third layer 4 before lamination is 15 μm or more. That is, the main feature of the present embodiment is to control the ten-point average roughness Rz of each layer before the lamination constituting the intermediate film 1 in this way.

  By providing the above features, the adhesion interface between the second layer 3 and the first and third layers 2 and 4 can be made uniform. For example, it is difficult for a rough region to be partially formed at the bonding interface between the second layer 3 and the first and third layers 2 and 4. Therefore, when light passes through the intermediate film 1 obtained as described above and the laminated glass using the intermediate film 1, unevenness in appearance can be suppressed and it is difficult to visually recognize the pattern.

  In addition, in the interlayer film for laminated glass in which the layer containing the conventional inorganic particles is laminated on a layer different from the layer containing the inorganic particles, at the adhesive interface between the layer containing the inorganic particles and the other layer, For example, there are many irregularities on the surface of each layer. For this reason, when light passes through the intermediate film or the laminated glass, the light is scattered due to the unevenness, the appearance unevenness is likely to occur, and the pattern may be visually recognized.

  Next, the intermediate film 1 can be obtained by laminating the first layer 2, the second layer 3, and the third layer 4 obtained in the above manner in this order.

  As a method of laminating the first to third layers 2 to 4, a method in which the first to third layers 2 to 4 are overlapped, heated and pressurized, and integrated is suitably used. Moreover, the 1st laminated glass structural member, the 1st-3rd layers 2-4, and the 2nd laminated glass structural member may be piled up, may be heated and pressurized, and may be integrated. That is, the intermediate film may be formed simultaneously with the production of the laminated glass. In order to obtain an intermediate film that does not include the third layer 4, the first layer 2 and the second layer 3 may be laminated.

  Moreover, when obtaining the intermediate film 1, it is preferable to use the 2nd layer obtained as follows.

  In order to obtain the 2nd layer formation composition for forming the 2nd layer 3, the inorganic particle 5 is disperse | distributed to a plasticizer, and the dispersion liquid by which the inorganic particle was disperse | distributed to the plasticizer is obtained. Next, the obtained dispersion liquid and the thermoplastic resin are mixed, and a second layer forming composition containing the thermoplastic resin, the plasticizer, and the inorganic particles 5 is prepared. That is, in order to prepare the composition for forming the second layer and produce the second layer 3, it is preferable not to add the inorganic particles 5 to the thermoplastic resin in a state where it is not dispersed in the plasticizer. Moreover, it is preferable that the thermoplastic resin, the plasticizer, and the inorganic particles 5 are added at a time and not mixed. Next, the second layer 3 is formed as described above using the obtained second layer forming composition.

  After the inorganic particles 5 are dispersed in the plasticizer, the inorganic particles 5 are uniformly dispersed in the second layer 3 by using the second layer forming composition in which the dispersion and the thermoplastic resin are mixed. Can do. For this reason, it becomes difficult for the inorganic particles 5 to be partially concentrated at the bonding interface between the second layer 3 and the first and third layers 2 and 4. For this reason, the adhesion interface between the second layer 3 and the first and third layers 2 and 4 can be made more uniform. For example, it is difficult for a rough region to be partially formed at the bonding interface between the second layer 3 and the first and third layers 2 and 4. Therefore, when light passes through the intermediate film 1 obtained as described above and the laminated glass using the intermediate film 1, unevenness in appearance can be further suppressed, and the pattern can be made more difficult to visually recognize. .

(Details of materials of first to third layer forming compositions)
The second layer 3 and the second layer forming composition include a thermoplastic resin and inorganic particles 5. The second layer 3 and the second layer forming composition preferably include a thermoplastic resin, a plasticizer, and inorganic particles 5. Each of the first and third layers 2 and 4 and the first and third layer-forming compositions contains a thermoplastic resin. More preferably, the first and third layers 2 and 4 and the first and third layer forming compositions each include a thermoplastic resin and a plasticizer.

  The thermoplastic resin is not particularly limited. Examples of the thermoplastic resin include polyvinyl acetal resin, ethylene-vinyl acetate copolymer resin, ethylene-acrylic copolymer resin, polyurethane resin, sulfur-containing polyurethane resin, and polyvinyl alcohol resin. Of these, polyvinyl acetal resin is preferably used. As for the said thermoplastic resin, only 1 type may be used and 2 or more types may be used together. Further, the thermoplastic resins used in the first to third layer forming compositions may be the same or different.

  The polyvinyl acetal resin is a resin obtained by acetalizing a polyvinyl alcohol resin (PVA) with an aldehyde. As said polyvinyl acetal resin, the polyvinyl acetal resin generally used for the intermediate film for laminated glasses can be used. Examples of the polyvinyl acetal resin include a polyvinyl formal resin obtained by reacting a polyvinyl alcohol resin and formaldehyde, a narrowly defined polyvinyl acetal resin obtained by reacting a polyvinyl alcohol resin and acetaldehyde, and a polyvinyl alcohol resin and n-butyraldehyde. And polyvinyl butyral resin obtained by the reaction.

  The polyvinyl acetal resin is preferably a resin obtained by acetalizing a polyvinyl alcohol resin with an aldehyde having 1 to 10 carbon atoms, and more preferably a polyvinyl butyral resin. The more preferable lower limit of the carbon number of the aldehyde is 4, and the more preferable upper limit is 6. The vinyl acetate component (residual acetyl group) of the polyvinyl acetal resin is preferably 30 mol% or less.

  The thermoplastic resin contained in the second layer 3 and the second layer forming composition is preferably a polyvinyl acetal resin A, and more preferably a polyvinyl butyral resin A. The preferable lower limit of the vinyl acetate component A (residual acetyl group) of the polyvinyl acetal resin A is 1 mol%, the more preferable lower limit is 5 mol%, the still more preferable lower limit is 8 mol%, and the preferable upper limit is 30 mol%, more preferable. The upper limit is 28 mol%, and a more preferable upper limit is 25 mol%.

  The thermoplastic resin contained in the first, third layers 2, 4 and the first and third layer forming compositions is preferably polyvinyl acetal resin B, more preferably polyvinyl butyral resin B. . The preferable lower limit of the vinyl acetate component B (residual acetyl group) of the polyvinyl acetal resin B is 0.1 mol%, the more preferable lower limit is 0.5 mol%, the preferable upper limit is 5 mol%, and the more preferable upper limit is 3 mol%. is there.

  Since the sound insulation of the interlayer film for laminated glass according to the present invention is improved, the vinyl acetate component A is preferably more than the vinyl acetate component B, more preferably 0.1 mol% or more, and More preferably, it is more than 2 mol%, and particularly preferably more than 0.5 mol%.

  The manufacturing method of the said polyvinyl acetal resin is not specifically limited. The said polyvinyl acetal resin can be manufactured with a conventionally well-known manufacturing method.

  Each of the first to third layer forming compositions preferably contains a plasticizer. In particular, when the thermoplastic resin is a polyvinyl acetal resin, a plasticizer is preferably included. By the combined use of the polyvinyl acetal resin and the plasticizer, the adhesive force between the interlayers of the interlayer film and the adhesive force between the interlayer film and the laminated glass constituent member can be further increased.

  As the plasticizer, known plasticizers generally used for interlayer films can be used. Examples of the plasticizer include triethylene glycol-di-2-ethylbutyrate (3GH), triethylene glycol-di-2-ethylhexanoate (3GO), and triethylene glycol-di-n-heptanoate (3G7). , Tetraethylene glycol-di-2-ethylhexanoate (4GO), tetraethylene glycol-di-n-heptanoate (4G7) or oligoethylene glycol-di-2-ethylhexanoate (NGO) is preferably used. . Of these, triethylene glycol-di-2-ethylhexanoate is more preferable.

  Examples of the plasticizer include phthalic acid esters such as ricinoleic acid alkyl ester, dioctyl phthalate (DOP), dibutyl phthalate (DBP) and diisodecyl phthalate (DIDP), di-2-ethylhexyl adipate (DOA) and diisodecyl adipate ( Adipic acid esters such as DIDA), sebacic acid esters such as dibutyl sebacate (DBS) and di-2-ethylhexyl sebacate (DOS), phosphate esters such as tricresyl phosphate (TCP) and trioctyl phosphate (TOP), In addition, epoxidized soybean oil or the like may be used. As for the said plasticizer, only 1 type may be used and 2 or more types may be used together. The plasticizers used in the first to third layer forming compositions may be the same or different.

  The plasticizer content of the first to third layer forming compositions is preferably in the range of 25 to 70 parts by weight with respect to 100 parts by weight of the thermoplastic resin. The minimum with more preferable content of the said plasticizer with respect to 100 weight part of said thermoplastic resins is 30 weight part, and a more preferable upper limit is 68 weight part. When the content of the plasticizer is within the above range, the penetration resistance of the interlayer film can be further enhanced, and the adhesion between the interlayer film and the laminated glass constituent member can be further enhanced.

  The content of the plasticizer in the second layer forming composition is more preferably in the range of 50 to 70 parts by weight with respect to 100 parts by weight of the thermoplastic resin, and 60 to 70 parts by weight. More preferably within the range. The plasticizer contents of the first and third layer-forming compositions are more preferably in the range of 25 to 50 parts by weight with respect to 100 parts by weight of the thermoplastic resin. More preferably within the range of parts by weight.

  Since the sound insulating property of the interlayer film for laminated glass according to the present invention is improved, the content of the plasticizer with respect to 100 parts by weight of the thermoplastic resin of the second layer forming composition is The content of the plasticizer is preferably larger than the content of the plasticizer with respect to 100 parts by weight of the thermoplastic resin of the layer forming composition, more preferably 5 parts by weight or more, still more preferably 10 parts by weight or more, more preferably 15 parts by weight. It is particularly preferable that the number is larger.

  As the inorganic particles 5 contained in the second layer forming composition, calcium carbonate, alumina, kaolin clay, calcium silicate, magnesium oxide, magnesium hydroxide, aluminum hydroxide, magnesium carbonate, talc, feldspar powder, Examples include mica, barite, barium carbonate, titanium oxide, silica, and glass beads. As for the said inorganic particle, only 1 type may be used and 2 or more types may be used together.

  The inorganic particles 5 are preferably at least one selected from the group consisting of calcium carbonate, titanium oxide and silica, and more preferably calcium carbonate. By using these preferable inorganic particles, it is possible to obtain an interlayer film for laminated glass in which unevenness in appearance is suppressed when light is transmitted and the pattern is hardly visible.

  The average particle diameter of the inorganic particles 5 is preferably in the range of 1 to 100 μm, and more preferably in the range of 1 to 50 μm. The average particle diameter can be measured by a dynamic light scattering method using an Ar laser as a light source, using a light scattering measuring device. Examples of the light scattering measurement device include “DLS-6000AL” manufactured by Otsuka Electronics Co., Ltd.

  The content of the inorganic particles 5 in the second layer forming composition is preferably in the range of 0.3 to 30 parts by weight with respect to 100 parts by weight of the thermoplastic resin. The minimum with more preferable content of the inorganic particle 5 with respect to 100 weight part of said thermoplastic resins is 0.5 weight part, and a more preferable upper limit is 20 weight part. When the content of the inorganic particles 5 is within the above range, an appropriately colored intermediate film can be obtained. Further, when light is transmitted, the appearance unevenness is more difficult to occur, and the pattern is more difficult to be visually recognized.

  The first and third layer forming compositions preferably do not contain inorganic particles. When inorganic particles are not included, since there are no inorganic particles on the surfaces of the first and third layers 2 and 4, a laminated glass constituent member is further formed on the surfaces of the first and third layers 2 and 4. It can be firmly bonded. However, the first and third layer forming compositions may contain inorganic particles. In this case, the content of inorganic particles in the first and third layer forming compositions is preferably smaller than the content of inorganic particles in the second layer forming composition. There exists a tendency for the adhesive force of a 1st, 3rd layer and a laminated glass structural member to fall, so that there is much content of an inorganic particle.

  The first to third layer forming compositions include heat ray shielding particles, light shielding agents, colorants, ultraviolet absorbers, antioxidants, adhesive strength modifiers, light stabilizers, flame retardants, antistatic agents, and moisture resistance. Known additives used for interlayer films for laminated glass, such as an agent, a heat ray reflective agent and a heat ray absorber, can be added.

  Examples of the heat ray shielding particles include tin-doped indium oxide (ITO), antimony-doped tin oxide (ATO), aluminum-doped zinc oxide (AZO), indium-doped zinc oxide (IZO), tin-doped zinc oxide, silicon-doped zinc oxide, and antimony. Examples include zinc acid, lanthanum hexaboride, cerium hexaboride, gold powder, silver powder, platinum powder, and aluminum powder.

  Examples of the light-shielding agent include carbon black and red iron oxide.

  Examples of the colorant include pigments and dyes. The colorant is preferably a pigment. As the pigment, a black pigment carbon black, a red pigment (CI Pigment red), a blue pigment (CI Pigment blue), and a yellow pigment (CI Pigment yellow) were mixed. Examples include dark reddish brown mixed pigments.

  Examples of the ultraviolet absorber include malonic acid ester compounds, oxalic acid anilide compounds, benzotriazole compounds, benzophenone compounds, triazine compounds, benzoate compounds, hindered amine compounds, and the like. Of these, benzotriazole compounds are preferred.

  Examples of the antioxidant include t-butylhydroxytoluene and tetrakis- [methylene-3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane.

  Examples of the adhesive strength modifier include alkali metal salts of organic and inorganic acids, alkaline earth metal salts of organic and inorganic acids, silane coupling agents, and modified silicone oils.

(Laminated glass)
The interlayer film for laminated glass according to the present invention is used for obtaining laminated glass.

  FIG. 2 shows an example of a laminated glass using the intermediate film 1 shown in FIG.

  A laminated glass 11 shown in FIG. 2 includes an intermediate film 1 and first and second laminated glass constituting members 12 and 13. The intermediate film 1 is an intermediate film for laminated glass. The intermediate film 1 is sandwiched between the first and second laminated glass constituent members 12 and 13. Therefore, the laminated glass 11 is configured by laminating the first laminated glass constituting member 12, the intermediate film 1, and the second laminated glass constituting member 13 in this order. The first laminated glass constituent member 12 is laminated on the surface of the first layer 2. The second laminated glass constituting member 13 is laminated on the surface of the third layer 4.

  Examples of the first and second laminated glass constituent members 12 and 13 include glass plates and PET (polyethylene terephthalate) films. The laminated glass 11 includes not only a laminated glass in which an interlayer film for laminated glass is sandwiched between two glass plates, but also a laminated glass in which an interlayer film for laminated glass is sandwiched between a glass plate and a PET film or the like. included. The laminated glass 11 is a glass plate-containing laminate, and it is sufficient that at least one glass plate is used. Further, another laminated glass constituent member may be laminated on the outer surface of at least one of the first and second laminated glass constituent members 12 and 13. The another laminated glass constituent member may be a glass plate.

  Examples of the glass plate include inorganic glass and organic glass. Examples of the inorganic glass include float plate glass, heat ray absorbing plate glass, polished plate glass, mold plate glass, mesh plate glass, and wire plate glass. The organic glass is a synthetic resin glass substituted for inorganic glass. Examples of the organic glass include polycarbonate plates and poly (meth) acrylic resin plates. Examples of the poly (meth) acrylic resin plate include a polymethyl (meth) acrylate plate.

  Although the thickness of the laminated glass component members 12 and 13 is not specifically limited, It is preferable to exist in the range of 1-3 mm. Moreover, when the laminated glass structural members 12 and 13 are glass plates, it is preferable that the thickness of this glass plate exists in the range of 1-3 mm. When the laminated glass constituent members 12 and 13 are PET films, the thickness of the PET film is preferably in the range of 0.03 to 0.5 mm.

  The manufacturing method of the laminated glass 11 is not specifically limited. For example, the intermediate film 1 is sandwiched between the first and second laminated glass constituent members 12 and 13 and passed through a pressing roll, or put in a rubber bag and sucked under reduced pressure, so that the first and second The air remaining between the laminated glass constituent members 12 and 13 and the intermediate film 1 is deaerated. Then, it pre-adheres at about 70-110 degreeC, and a laminated body is obtained. Next, the laminated body is put in an autoclave or pressed, and pressed at about 120 to 150 ° C. and a pressure of 1 to 1.5 MPa. In this way, the laminated glass 11 can be obtained. Further, as described above, the intermediate film 1 may be formed simultaneously with the production of the laminated glass 11.

  In the present embodiment, since the ten-point average roughness Rz of each layer before the lamination constituting the intermediate film 1 is controlled as described above, the air between the layers can be sufficiently deaerated.

  Hereinafter, the present invention will be described in more detail with reference to examples. The present invention is not limited only to the following examples.

(Synthesis Example 1)
Synthesis of polyvinyl butyral resin (a):
191 parts by weight of polyvinyl alcohol having an average degree of polymerization of 1700 and a degree of saponification of 88.1 mol% was added to 2890 parts by weight of pure water, heated and dissolved to obtain a solution. The temperature of this solution was adjusted to 12 ° C., and 201 parts by weight of 35% by weight hydrochloric acid catalyst and 148 parts by weight of n-butyraldehyde were added to the above solution and kept at 12 ° C. to precipitate the reaction product. Then, it hold | maintained at 45 degreeC for 3 hours, and reaction was completed. Next, it was washed with excess water, unreacted n-butyraldehyde was washed away, and the hydrochloric acid catalyst was neutralized with an aqueous sodium hydroxide solution. After washing with excess water for 2 hours, it was dried to obtain a white powdery polyvinyl butyral resin (a).

  The degree of butyralization of the obtained polyvinyl butyral resin (a) was 63.8 mol%, and the vinyl acetate component was 11.9 mol%.

(Synthesis Example 2)
Synthesis of polyvinyl butyral resin (b):
191 parts by weight of polyvinyl alcohol having an average degree of polymerization of 1700 and a saponification degree of 98.9 mol% was added to 2890 parts by weight of pure water, heated and dissolved to obtain a solution. The temperature of this solution was adjusted to 12 ° C., and 201 parts by weight of 35% by weight hydrochloric acid catalyst and 152 parts by weight of n-butyraldehyde were added to the above solution and maintained at 12 ° C. to precipitate the reaction product. Then, it hold | maintained at 45 degreeC for 3 hours, and reaction was completed. Next, it was washed with excess water, unreacted n-butyraldehyde was washed away, and the hydrochloric acid catalyst was neutralized with an aqueous sodium hydroxide solution. After washing with excess water for 2 hours, it was dried to obtain a white powdery polyvinyl butyral resin (b).

  The degree of butyralization of the obtained polyvinyl butyral resin (b) was 68.0 mol%, and the vinyl acetate component was 1.1 mol%.

Example 1
Preparation of composition A:
60 parts by weight of triethylene glycol-di-2-ethylhexanoate (3GO) as a plasticizer and 5 weights of calcium carbonate as inorganic particles (“Super # 1500” manufactured by Maruo Calcium Co., Ltd., average particle size 2.2 μm) The liquid was dispersed to obtain a dispersion liquid in which inorganic particles were dispersed in a plasticizer.

  65 parts by weight of the obtained dispersion and 100 parts by weight of the polyvinyl butyral resin (a) were mixed to obtain a composition A.

Preparation of composition B:
100 parts by weight of the polyvinyl butyral resin (b) and 40 parts by weight of triethylene glycol-di-2-hexanoate (3GO) as a plasticizer were mixed to obtain a composition B.

Laminated glass production:
The obtained composition A was used as the second layer forming composition. The composition A was sufficiently melt-kneaded with a mixing roll and then press-molded at 150 ° C. for 30 minutes using a press molding machine. Then, the embossing roll was passed, and the engraved embossed pattern (it was also called embossed engraving) was formed in the surface. Thus, the 2nd layer (milky white layer, thickness 0.1mm) whose 10-point average roughness Rz of the surface of both sides measured based on JISB0601: 1994 was 5 micrometers was produced.

  Further, the obtained composition B was used as the first layer forming composition. The composition B was sufficiently melt-kneaded with a mixing roll and then press-molded at 150 ° C. for 30 minutes using a press molding machine. Then, the embossing roll was passed, and the engraved embossed pattern was formed in the surface. Thus, the 1st layer (transparent layer, thickness 0.33mm) whose 10-point average roughness Rz of the surface of both sides measured based on JISB0601: 1994 was 30 micrometers was produced.

  The obtained first layer and second layer were each cut into a size of 30 cm in length and 30 cm in width.

  Between the two glass plates (length 30 cm × width 30 cm × thickness 2.5 mm), the obtained first layer and the obtained second layer are superposed and sandwiched in this order to obtain a laminate. Got. Next, the obtained laminate was put in a rubber bag and deaerated for 20 minutes at a vacuum degree of 2.6 kPa. While being deaerated, the laminate was stored in an oven at 90 ° C. for 30 minutes to obtain a laminated glass provided with an interlayer film for laminated glass.

(Example 2)
Laminated glass production:
In the production of the second layer, the second layer was produced in the same manner except that the embossing roll was changed and the ten-point average roughness Rz on both surfaces was changed from 5 μm to 14 μm. A laminated glass provided with an interlayer film for laminated glass was obtained in the same manner as in Example 1 except that the obtained second layer was used.

(Example 3)
Preparation of composition C:
A composition C was obtained in the same manner except that the content of the inorganic particles was changed from 5 parts by weight to 3 parts by weight when preparing the composition A of Example 1.

Laminated glass production:
A second layer was produced in the same manner as in Example 1 except that the composition C obtained instead of the composition A was used as the second layer forming composition. A laminated glass provided with an interlayer film for laminated glass was obtained in the same manner as in Example 1 except that the obtained second layer was used.

Example 4
Preparation of composition D:
A composition D was obtained in the same manner except that the content of the inorganic particles was changed from 5 parts by weight to 10 parts by weight when the composition A of Example 1 was prepared.

Laminated glass production:
A second layer was produced in the same manner as in Example 1 except that the composition D obtained instead of the composition A was used as the second layer forming composition. A laminated glass provided with an interlayer film for laminated glass was obtained in the same manner as in Example 1 except that the obtained second layer was used.

(Example 5)
Laminated glass production:
The obtained composition B was used as the third layer forming composition. The composition B was sufficiently melt-kneaded with a mixing roll and then press-molded at 150 ° C. for 30 minutes using a press molding machine. Then, the embossing roll was passed, and the engraved embossed pattern was formed in the surface. Thus, the 3rd layer (transparent layer, thickness 0.33mm) whose 10-point average roughness Rz of the surface of both sides measured based on JISB0601: 1994 was 30 micrometers was produced.

  The obtained third layer was cut into a size of 30 cm long × 30 cm wide.

  Between two glass plates (length 30 cm × width 30 cm × thickness 2.5 mm), the first layer obtained in Example 1 and the second layer obtained in Example 1 were obtained. The third layer was superposed and sandwiched in this order to obtain a laminate. Next, the obtained laminate was put in a rubber bag and deaerated for 20 minutes at a vacuum degree of 2.6 kPa. While being deaerated, the laminate was stored in an oven at 90 ° C. for 30 minutes to obtain a laminated glass provided with an interlayer film for laminated glass.

(Example 6)
Laminated glass production:
A laminated glass provided with an interlayer film for laminated glass was obtained in the same manner as in Example 5 except that the second layer obtained in Example 2 was used instead of the second layer obtained in Example 1. Obtained.

(Comparative Example 1)
Laminated glass production:
In the production of the second layer, the second layer was produced in the same manner except that the embossing roll was changed and the ten-point average roughness Rz on both surfaces was changed from 5 μm to 20 μm. A laminated glass provided with an interlayer film for laminated glass was obtained in the same manner as in Example 1 except that the obtained second layer was used.

(Comparative Example 2)
Laminated glass production:
In the production of the second layer, the second layer was produced in the same manner except that the embossing roll was changed and the ten-point average roughness Rz on both surfaces was changed from 5 μm to 30 μm. A laminated glass provided with an interlayer film for laminated glass was obtained in the same manner as in Example 1 except that the obtained second layer was used.

(Evaluation)
A fluorescent lamp was placed at a position 200 cm away from the eyes. The direction of connecting the center of the fluorescent lamp and the eye so that the center of the laminated glass is positioned on the line connecting the center of the fluorescent lamp and the eye at a position 60 cm away from the eye, and the thickness of the laminated glass Laminated glass was placed so that the direction was parallel.

  The appearance of the laminated glass when the light from the fluorescent light was transmitted through the laminated glass was evaluated according to the following evaluation criteria.

[Evaluation criteria for appearance]
○: No appearance irregularity is observed and no pattern is observed. ×: The appearance irregularity is present and the pattern is observed. The blending components of the compositions A to D are shown in Table 1 below. The evaluation results are shown in Table 2 below.

DESCRIPTION OF SYMBOLS 1 ... Intermediate film for laminated glass 2 ... 1st layer 2a ... Surface 3 ... 2nd layer 3a ... One surface 3b ... Other surface 4 ... 3rd layer 4a ... Surface 5 ... Inorganic particle 11 ... Laminated glass 12 ... 1st laminated glass component 13 ... 2nd laminated glass component

Claims (10)

A method for producing an interlayer film for laminated glass in which a first layer and a second layer are laminated,
Using a first layer comprising a thermoplastic resin, and
Using a second layer containing a thermoplastic resin and inorganic particles and having a ten-point average roughness Rz of 15 μm or less on the surface on which the first layer of the second layer before lamination is laminated,
The manufacturing method of the intermediate film for laminated glasses provided with the process of obtaining the intermediate film for laminated glasses by laminating | stacking a said 1st layer and a said 2nd layer.   Ten-point average roughness Rz of the surface on which the second layer of the first layer before lamination is laminated, and ten points of the surface on which the first layer of the second layer before lamination is laminated The manufacturing method of the intermediate film for laminated glasses of Claim 1 using the 1st, 2nd layer whose absolute value of the difference with average roughness Rz is 15 micrometers or more. A method for producing an interlayer film for laminated glass in which a first layer, a second layer, and a third layer are laminated in this order,
Using the first layer containing the thermoplastic resin,
Using a second layer containing a thermoplastic resin and inorganic particles and having a 10-point average roughness Rz of 15 μm or less on both sides of the second layer before lamination; and
Using a third layer containing a thermoplastic resin,
3. The intermediate for laminated glass according to claim 1, comprising a step of obtaining an intermediate film for laminated glass by laminating the first layer, the second layer, and the third layer in this order. A method for producing a membrane.   Ten-point average roughness Rz of the surface on which the second layer of the first layer before lamination is laminated, and ten points of the surface on which the first layer of the second layer before lamination is laminated The absolute value of the difference from the average roughness Rz is 15 μm or more, and the ten-point average roughness Rz of the surface on which the third layer of the second layer before lamination is laminated, and the first before lamination. The laminated glass of Claim 3 using the 1st-3rd layer whose absolute value of the difference with the 10-point average roughness Rz of the surface where the said 2nd layer of the 3 layer is laminated | stacked is 15 micrometers or more. Method for manufacturing an interlayer film. A method for producing an interlayer film for laminated glass in which a first layer and a second layer are laminated,
Using the first layer containing the thermoplastic resin,
Using a second layer comprising a thermoplastic resin and inorganic particles, and
Ten-point average roughness Rz of the surface on which the second layer of the first layer before lamination is laminated, and ten points of the surface on which the first layer of the second layer before lamination is laminated Using the first and second layers whose absolute value of the difference from the average roughness Rz is 15 μm or less,
The manufacturing method of the intermediate film for laminated glasses provided with the process of obtaining the intermediate film for laminated glasses by laminating | stacking a said 1st layer and a said 2nd layer. A method for producing an interlayer film for laminated glass in which a first layer, a second layer, and a third layer are laminated in this order,
Using the first layer containing the thermoplastic resin,
Using the second layer containing the thermoplastic resin and inorganic particles,
Using a third layer comprising a thermoplastic resin, and
Ten-point average roughness Rz of the surface on which the second layer of the first layer before lamination is laminated, and ten points of the surface on which the first layer of the second layer before lamination is laminated The absolute value of the difference from the average roughness Rz is 15 μm or more, and the ten-point average roughness Rz of the surface on which the third layer of the second layer before lamination is laminated, and the first before lamination. Using the first to third layers whose absolute value of the difference from the ten-point average roughness Rz of the surface on which the second layer of the three layers is laminated is 15 μm or more,
The interlayer film for laminated glass according to claim 5, comprising a step of obtaining an interlayer film for laminated glass by laminating the first layer, the second layer, and the third layer in this order. Production method. After dispersing inorganic particles in a plasticizer to obtain a dispersion, the obtained dispersion and thermoplastic resin are mixed, and a second layer forming composition containing the thermoplastic resin, the plasticizer, and inorganic particles Preparing a product,
The method of any one of Claims 1-6 further equipped with the process of obtaining the 2nd layer containing a thermoplastic resin, a plasticizer, and an inorganic particle using the said 2nd layer formation composition. A method for producing an interlayer film for laminated glass.   The method for producing an interlayer film for laminated glass according to any one of claims 1 to 7, wherein calcium carbonate is used as the inorganic particles.   The intermediate film for laminated glasses obtained by the manufacturing method of the intermediate film for laminated glasses of any one of Claims 1-8. An interlayer film for laminated glass according to claim 9,
First and second laminated glass components,
Laminated glass in which the interlayer film for laminated glass is sandwiched between the first and second laminated glass constituting members.

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