TW201416227A - Interlayer for laminated glass and laminated glass containing the same - Google Patents

Abstract

The present invention provides an interlayer for laminated glass and a laminated glass containing said interlayer. The interlayer has a pattern on both sides, wherein the pattern is composed of plurality of V-shaped grooves and the adjacent angles of the V-shaped grooves are different. Due to the pattern, the interlayer would not result in moire phenomenon while laminating with the glass, hence providing good workability in cutting and laminating and good deaeration in preliminary contact bonding.

Description

Interlayer film for laminated glass and laminated glass therewith

The present invention relates to an interlayer film for laminated glass having excellent deaeration property and a laminated glass comprising the same, and more particularly to an interlayer film having a multi-V-shaped groove line stripe surface and a laminated glass containing the same.

Generally, a laminated glass is formed by sandwiching an intermediate film formed of a thermoplastic resin sheet between glass sheets, and vacuuming the air between the glass and the interlayer film by a nip roll or a rubber bag. Degassing, while pre-compression bonding, followed by heating by an autoclave, results in a laminated glass which has been widely used in windows of vehicles, aviation tools or buildings. When the laminated glass is subjected to an external impact, since the glass is attached to the intermediate film after being damaged, the dangerous situation in which the glass fragments are scattered can be avoided, thereby preventing people inside or outside the vehicle or the building from being injured by the splash of the glass. .

The above-mentioned intermediate film has good basic properties such as transparency, self-adhesiveness, adhesion or weather resistance, and other properties such as handling convenience in the step of sandwiching between glass plates, and pre-clamping. The gas and the avoidance of the moire phenomenon are the key points required for the interlayer film; and the most important one is the degassing property of the intermediate film during pre-compression and the corrugation of the interlayer film.

It is known in the prior art that the surface roughness of the intermediate film contributes to the degassing property during pre-compression, because during the pre-compression of the intermediate film, when the pressure is applied to the vacuum under heating, the rough surface is in the glass. A fine passage is formed between the smooth surface and the adjacent intermediate film to discharge the air; if the degassing property of the intermediate film is not good, the laminated glass product may be defective in air bubbles or partial incomplete lamination, and the degassing property may be pre-compressed. Finished product transmittance measurement after receiving (the greater the transmittance, the representative The degassing property of the interlayer film is better); although the surface roughness of the above intermediate film can improve the degassing property, there is still room for improvement in the degassing property, and in order to achieve the better degassing property of the intermediate film, it is often used. The method is to emboss a plurality of lattices or line-like patterns formed by fine concave portions and convex portions on both sides of the intermediate film, so that the air between the intermediate film and the glass can be smoothly embossed when the intermediate film is pre-compressed. The channel is excluded to increase the degassing. However, these regular embossings may cause ripples due to the interference of the diffractive surfaces of each other. When the intermediate film is cut or processed, the operator is susceptible to the streaks of the blinking glare and the eyes are fatigued and dizzy. , which makes the workability lower.

U.S. Patent No. 5,455,103 discloses a rough-surfaced intermediate layer which forms a regularly patterned channel on each side of the intermediate layer, with the channels on each side being angularly aligned with each other at an angle of at least 25 degrees. To increase the degassing of the intermediate layer and to avoid ripples in the interlayer film. However, if the intermediate layer does not closely control the temperature at which degassing is started in the pre-crimping process, the periphery of the laminated glass is first sealed when the pre-compression is pressed, and the air inside the laminated glass is more difficult to be discharged, resulting in degassing. full.

In addition, in the conventional processing technology, the surface film (or channel) of the intermediate film is produced by a pressure roller method under high temperature and high pressure, and since the composition of the intermediate film is a thermoplastic resin, the chemical property is sticky at a high temperature. Therefore, in order to prevent the intermediate film from sticking to the roller, the skilled person sprays the release agent on the roller, so that when the intermediate film is pressed by the high-temperature pressure roller, the roller can be smoothly released from the roller; however, at a high temperature The high pressure extreme conditions affect the life of the release agent, so this defect also needs to be improved.

In view of this, there is still a strong demand for the interlayer film for laminated glass excellent in degassing and how to increase the service life of the release agent, and further development is required.

As a result of extensive research, the present inventors have found that an intermediate film used for laminated glass has a pattern shape formed thereon which has a considerable influence on the degassing property in a process of laminating and crimping a glass and an intermediate film, and thus completed the present invention.

The inventors of the present invention have in view of the above-mentioned drawbacks, and an object thereof is to provide an interlayer film for laminated glass and a laminated glass containing the same, which does not have a corrugation phenomenon during processing between the sandwiched glass, thereby making the processing time It has excellent workability and, in addition, excellent degassing during pre-compression bonding, avoiding the generation of bubbles and obtaining high-quality laminated glass; in addition, when the intermediate film and the glass interlayer are processed, no matter which direction the intermediate film is placed Putting it in the glass does not affect its degassing property; on the other hand, in the process of the intermediate film of the present invention, only the conditions of low temperature and low pressure are required, and the concave V-shaped groove can be pressed on the surface of the intermediate film. The grooved passage has less influence on the release agent on the surface of the roller due to the low temperature and low pressure of the process, and can extend the service life of the release agent.

Accordingly, an aspect of the present invention provides an intermediate film for laminated glass, which is formed by embossing on both sides of a sheet formed of a thermoplastic resin, so that each surface has a plurality of V-shaped grooves. The V-shaped groove can be equal or unequal in length, and the V-shaped angle is between 25 and 90 degrees, and the V-shaped groove angle of each adjacent V-shaped groove is different, and the V-shaped groove depth is different. Approximately 30 μm to 300 μm; the V-shaped groove has a width of about 30 μm to 150 μm and a horizontal distance of each adjacent V-shaped groove is about 16 μm to 600 μm.

Furthermore, due to the plurality of V-shaped grooves formed on the intermediate film, since the V-angle angle is between 25 and 90 degrees, and the adjacent V-shaped grooves have different V-angle angles, When the light encounters different angles, the angle of refraction is also different, so that the generation of the corrugation phenomenon can be avoided when the glass is interposed with the glass; in addition, the inventors have found that the embossing road of different angles can reduce the operation during the process. Conditional temperature and pressure, thus extending the pressure The life of the release agent on the flower roll.

Therefore, the intermediate film for laminated glass provided by the present invention not only improves the self-adhesiveness of the storage, but also improves the degassing property and avoids the ripple phenomenon in the pre-crimping process for manufacturing the laminated glass, and can be improved. The manufacturing process and processing workability enable the intermediate film to be efficiently applied to various processing conditions.

Another aspect of the present invention provides a laminated glass having at least two sheets of glass, and an interlayer film for a laminated glass of the present invention sandwiched therebetween.

A further aspect of the present invention provides a method for preventing a corrugation phenomenon of an interlayer film for a laminated glass from a rough surface and improving the degassing property of the interlayer film, comprising forming a plurality of V-shaped grooves on the intermediate film, The V-shaped grooves can be equal or unequal in length, so that the angle of the V-shaped angle is between 25 and 90 degrees, and the angle of the V-shaped angle of each adjacent V-shaped groove is different, and the depth of the V-shaped groove is about 30 μm to 300 μm; the V-shaped groove has a width of about 30 μm to 150 μm and the horizontal distance of each adjacent V-shaped groove is about 16 μm to 600 μm.

The terms used in the specification generally have their ordinary meaning in the technical field, in the context of the invention, and in the context of the invention. Some terms used to describe the inventors will be discussed below. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art. However, in case of conflict, the definition of this specification shall prevail.

Interlayer film for laminated glass of the present invention

The present invention is an aspect of the present invention to provide an interlayer film for laminated glass, which is formed by embossing on both sides of a sheet formed of a thermoplastic resin, so that each surface has a plurality of V-shaped grooves. The V-shaped groove can be equal or unequal in length, and the V-shaped angle is between 25 and 90 degrees, and the adjacent V-shaped grooves have different V-angle angles. And the V-shaped groove has a depth of about 30 μm to 300 μm; the V-shaped groove has a width of about 30 μm to 150 μm and the horizontal distance of each adjacent V-shaped groove is about 16 μm to 600 μm.

As used herein, the term "different V-shaped grooves have different V-angle angles" means that on the intermediate film, the V-shaped grooves may be, but are not limited to, a cycle of five different V-row angles, and in each cycle The angles of the adjacent V-shaped angles are different; for example, each cycle may be left oblique 45, left oblique 50, 53, right oblique 50, right oblique 45 degrees; or left oblique 26.5, left oblique 27.5, 28, Right oblique 27.5, right oblique 26.5 degrees; or, left oblique 63, left oblique 80, 90, right oblique 80, right oblique 63 degrees, wherein the left oblique or right oblique represents V-shaped groove on both sides of the unequal length resulting in a V-angle The vertices are offset to the left or right.

In the present invention, the "V-groove depth" means the distance between the apex of the V-shaped groove and the surface of the intermediate film.

The "V-shaped groove width" in the present invention means the distance between both sides of the V-shaped groove on the surface of the intermediate film.

In the present invention, the "horizontal distance of the V-shaped groove" means the distance between the V-shaped vertices of the adjacent two V-shaped grooves.

In a preferred embodiment of the present invention, wherein the V-shaped trench has a depth of about 30 μm to 150 μm, and the V-shaped trench has a depth of about 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, and 110 μm. 120 μm, 130 μm, 140 μm or 150 μm.

In a preferred embodiment of the present invention, the V-shaped trench has a width of about 30 μm to 130 μm, and the V-shaped trench width may be about 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, and 110 μm. , 120 μm or 130 μm.

In a preferred embodiment of the present invention, the horizontal distance of each adjacent V-shaped trench is about 300 μm to 600 μm, such as 300 μm, 350 μm, 400 μm, 450 μm, 500 μm, 550 μm or 600 μm.

In a more preferred embodiment, wherein the V-shaped trench has a depth of about 30 μm to 145 μm; the V-shaped trench has a width of about 30 μm to 130 μm and the horizontal distance of each adjacent V-shaped trench is about 600 μm.

According to the irregular pattern of the interlayer film for laminated glass according to the present invention, based on the above-described configuration, in the pre-crimping process during the processing of the laminated glass, the sides of the groove are formed toward the inside of the groove due to heating or pressurization. Crushing, according to the crushing, the air V-groove can be extruded to fully degas the laminated glass.

The term "thermoplastic resin sheet" as used herein refers to a conventional sheet which can be used for an interlayer film for general laminated glass, such as a plastic polyethylene acetal resin sheet (for example, polyvinyl butyral) or a polyurethane system. A resin sheet, an ethylene-vinyl acetate resin sheet, an ethylene-ethyl acrylate resin sheet, a plastic polyvinyl chloride resin sheet, or the like. These thermoplastic resin sheets are excellent in basic properties required for an interlayer film for laminated glass such as adhesion, weather resistance, penetration resistance, and transparency, and a polyvinyl acetal resin sheet is preferable. In a preferred embodiment of the invention, polyvinyl butyral is employed. The polyvinyl butyral used in the preferred embodiment of the present invention can be prepared in the presence of a catalyst to give an average degree of polymerization of from about 800 to 3,000, preferably from 1,000 to 2,500, of polyvinyl alcohol and butyraldehyde. The condensation reaction is carried out to obtain a polyvinyl butyral having a hydroxyl group content of 15 to 30% by weight, preferably 15 to 25% by weight, most preferably 19 to 24% by weight.

The polyvinyl butyral may further be added with a plasticizer used in the prior art, such as ethylene glycol di-2-ethylbutyrate, 1,3-propanediol di-2-ethylbutyrate, 1,4 -propylene glycol di-2-ethylbutyrate, 1,4-butanediol di-2-ethylbutyrate, 1,2-butanediol di-2-ethylbutyrate, diethylene glycol Di-2-ethylbutyrate, diethylene glycol di-2-ethylhexanoate, dipropylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylvalerate, Triethylene glycol di-2-ethylhexanoate, tetraethylene glycol di-2-ethylbutyrate, diethylene glycol dicaprate, triethylene glycol dicaprate, and the like.

Further, the intermediate film of the present invention may contain other additives if necessary, and the additives are not particularly limited as long as the properties of the obtained intermediate film are not adversely affected. For example, the additive may be used. It is a heat stabilizer, a UV absorber such as a benzotriazole series, an adhesion control agent such as an alkali metal or alkaline earth metal formate, and an antioxidant.

The above additives (including a plasticizer) are preferably added in an amount of from 20 to 60 parts by weight, more preferably from 30 to 40 parts by weight, based on 100 parts by weight of the polyvinyl butyral. In the range.

The film thickness of the thermoplastic resin sheet can be appropriately determined in consideration of the penetration resistance required for the laminated glass, etc., but is not particularly limited, and it is preferable to use the thickness of the intermediate film which is conventionally used in the prior art. 0.2 to 2 mm is preferred.

Laminated glass of the present invention

Another aspect of the present invention provides a laminated glass having at least two sheets of glass and an interlayer film for a laminated glass according to the present invention sandwiched therebetween.

The term "laminated glass" as used herein means that the interlayer film for laminated glass of the present invention is sandwiched between two sheets of glass sheets, and is not particularly limited, and is not limited to glass sheets/intermediate films/glass sheets. The three-layer structure of the composition may also be a multi-layered structure composed of a glass plate/intermediate film/glass plate/intermediate film/glass plate or the like.

The glass used in the present invention is not particularly limited, and may be, for example, an inorganic glass such as an inorganic glass or a polycarbonate plate or a polymethyl methacrylate.

The method for producing the laminated glass of the present invention is not particularly limited, and a method of generally manufacturing a laminated glass may be used. Briefly, the interlayer film for a laminated glass of the present invention is sandwiched between at least two sheets of glass, followed by pre-preparation. The crimping is performed to degas, and after the temporary sealing, crimping is performed in the autoclave to obtain an integrated laminated glass.

The pre-compression bonding system inserts a glass plate into the intermediate film of the present invention to form a laminated body, and the laminated body is degassed while passing through a pressure roller at a pressure of 2 to 1000 kPa and a temperature of 50 to 150 ° C. Pre-compression bonding (extrusion degassing method); or connecting the plastic bag in which the above laminated body is placed to the exhaust system, while vacuuming and decompressing at -40 to -75 kPa, the temperature is raised to 60 to 150 Pre-compression (decompression degassing method) was carried out under the conditions of °C.

The pre-compression laminated body can be formally laminated by using a conventional autoclave or a press machine at a temperature of 110 to 160 ° C and a pressure of 200 to 1500 kPa to produce a laminated glass.

In the above manufacturing method, the pressure and temperature conditions are not described in the prior art, but those skilled in the art can adjust the pressure and temperature conditions according to the characteristics of the intermediate film to achieve the best effect.

Method for corrugating an intermediate film for a laminated glass to avoid rough surface and improving degassing property of the intermediate film of the present invention

Another aspect of the present invention provides a method for preventing a corrugation phenomenon of an interlayer film for a laminated glass from a rough surface and improving the degassing property of the interlayer film, comprising forming a plurality of V-shaped grooves on the intermediate film, the V The two sides of the groove can be equal or unequal length, so that the angle of the V-shaped angle is between 25 and 90 degrees, the angle of the V-shaped angle of each adjacent V-shaped groove is different, and the depth of the V-shaped groove is about 30 μm. Up to 300 μm; the V-shaped groove has a width of about 30 μm to 150 μm and the horizontal distance of each adjacent V-shaped groove is about 16 μm to 600 μm.

Since the rough film has a plurality of V-shaped grooves on the interlayer film for the laminated glass, and the adjacent V-shaped grooves have different V-angle angles, the angle of refraction is different when the light encounters different angles, so The occurrence of the ripple phenomenon is effectively suppressed; and when the intermediate film is pre-compressed with the glass, the air between the intermediate film and the glass can be smoothly removed by the passage formed by the embossed road, and the degassing property of the intermediate film is increased.

The method of forming the above embossing can use an embossing roll method, a calender roll method, and a sizing type (profile) The extrusion method, etc., wherein the embossing roll method is preferred. When the embossing roll method is used, the surface of the metal roll may be blasted with a grinding material such as alumina or yttria, and then ground to form a desired embossed pattern on the surface of the roll (ie, complementary to the intermediate film of the present invention). The utility model has a plurality of V-shaped grooves, the two sides of the V-shaped groove being equal or unequal in length, such that the angle of the V-shaped angle is between 25 and 90 degrees, and the V-angle angle of each adjacent V-shaped groove Different, and the V-shaped groove depth is about 30 μm to 300 μm; the V-shaped groove width is about 30 μm to 150 μm and the horizontal distance of each adjacent V-shaped groove is about 16 μm to 600 μm), and the release agent is sprayed. When the embossing roll is in the rolling engagement, the area of the surface of the thermoplastic resin sheet is pressure-changed, so that the surface of the thermoplastic resin sheet forms the V-shaped groove. The embossing roll forming system may be disposed downstream of the die formed by the thermoplastic resin sheet film, so that the thermoplastic resin sheet formed by the die passes through the nip between the two rolling rolls, one of the two rolling rolls being a surface An embossing roll having the embossed pattern, wherein the embossed pattern is complementary to the pattern to be formed on the intermediate layer, and the other roll is a cooperating smooth surface supporting roll. After one side of the thermoplastic resin sheet is pressed by the embossing roll having the embossed pattern, the thermoplastic resin sheet is turned over to press the other side.

By using the V-shaped groove embossing road prepared by the method of the invention with different V-angle angles, the temperature and pressure of the operating conditions can be reduced during the process, so that the use of the release agent on the embossing roller can be extended. the term.

Example

The invention is illustrated by the following examples, which are not to be construed as limiting the invention. Modifications and variations of the embodiments discussed herein may be made without departing from the spirit and scope of the invention, and still fall within the scope of the invention.

Example 1. Preparation of interlayer film A1 for laminated glass of the present invention

The polyvinyl butyral interlayer film of Production Example 1 was cut into a 35 cm × 35 cm square, and the polyvinyl butyral interlayer film was heated in advance to 65 to 75 ° C, and then subjected to double-side pressing. The pressing condition is that the embossing roller temperature is 110 ° C and the pressure is 20 kg/cm ² , and the embossing roller has a plurality of parallel V-shaped convex line embossing roads, which is complementary to the line-shaped concave pattern which the intermediate film wants to have. The apex angle of the V-shaped angle is 45 degrees to 53 degrees, and the order is 45 degrees left, 50 degrees left, 53 degrees, 50 degrees right, and 45 degrees right. The apex angle is from the roll surface. a multi-angle V-shaped raised line having a height of 50 μm, a width of 50 μm, and a distance between adjacent apexes of 600 μm, which is pressed by an embossing roller which presses the intermediate film as described above, that is, the pressing is completed. Work to obtain the interlayer film A1 for laminated glass.

Example 2, preparing an interlayer film A2 for a laminated glass of the present invention

Each condition was the same as in Production Example 1, except that the embossing roll was replaced with an embossing roll having a plurality of parallel V-shaped raised line embossing paths, and the apex angle of the V-shaped angle was in the range of 45 to 53 degrees. The order of the order is 45 degrees left, 50 degrees left, 53 degrees, 50 degrees right, and 45 degrees right. The height of the top angle is 100 μm from the roll surface, the width is 100 μm, and the adjacent raised lines are mutually The multi-angle V-shaped convex line having a distance between the apexes of 600 μm is pressed by an embossing roller which presses the intermediate film as described above, that is, the pressing operation is completed, and the intermediate film A2 for the laminated glass is obtained.

Example 3, preparing an interlayer film A3 for a laminated glass of the present invention

Each condition was the same as in Production Example 1, except that the embossing roll was replaced with an embossing roll having a plurality of parallel V-shaped raised line embossing paths, and the apex angle of the V-shaped angle was in the range of 45 to 53 degrees. The order of the order is 45 degrees left, 50 degrees left, 53 degrees, 50 degrees right, and 45 degrees right. The height of the apex angle is 200 μm from the roll surface, the width is 200 μm, and the adjacent raised lines are mutually The multi-angle V-shaped convex line with a distance between the vertices of 600 μm is pressed by the embossing roller which presses the intermediate film as described above, that is, the pressing operation is completed, and the laminated glass is obtained. Intermediate film A3.

Example 4, preparing an interlayer film A4 for laminated glass of the present invention

Each condition was the same as in Production Example 1, except that the embossing roll was replaced with an embossing roll having a plurality of parallel V-shaped raised line embossing paths, and the apex angle of the V-shaped angle was in the range of 45 to 53 degrees. The order of the order is 45 degrees left, 50 degrees right, 53 degrees, 45 degrees right, and 50 degrees left. The height of the top angle is 100 μm from the roll surface, the width is 100 μm, and the adjacent raised lines are mutually The multi-angle V-shaped convex line having a distance between the vertices of 600 μm is pressed by an embossing roller which presses the intermediate film as described above, that is, the pressing operation is completed, and the intermediate film A4 for the laminated glass is obtained.

Example 5, preparing an interlayer film A5 for laminated glass of the present invention

The polyvinyl butyral interlayer film of Production Example 1 was used in the same manner as in Example 1, except that the pressing conditions were an embossing roller temperature of 90 ° C, a pressure of 10 kg/cm ² , and the embossing rolls were replaced with a plurality of strips. The embossing rollers of the parallel V-shaped raised line embossing road are pressed, and the apex angle of the V-shaped angle is in the range of 26.5 degrees to 28 degrees, and the order of the steps is 26.5 degrees for the left angle and 27.5 degrees for the left angle, 28 degrees for the left angle. , a right angle of 27.5 degrees, a right angle of 26.5 degrees is a cycle, the apex angle is 100 μm from the roll surface, the width is 50 μm, and the distance between adjacent apexes is 600 μm. The pressing operation is performed by pressing an embossing roller which presses the intermediate film as described above, and the pressing operation is completed to obtain an intermediate film A5 for laminated glass.

Example 6 Preparation of interlayer film A6 for laminated glass of the present invention

The polyvinyl butyral intermediate film of Production Example 1 was used in the same manner as in Example 1, except that the pressing conditions were an embossing roller temperature of 120 ° C, a pressure of 20 kg/cm ² , and the embossing rolls were replaced with a plurality of strips. The embossing rollers of the V-shaped raised line embossing road are pressed, and the angle of the apex angle of the V-shaped angle is in the range of 63 degrees to 90 degrees, and the order of the steps is left oblique 63 degrees, left oblique 80 degrees, 90 degrees. , a right angle of 80 degrees, a right angle of 63 degrees is a cycle, the apex angle is 100 μm from the roll surface, the width is 200 μm, and the distance between adjacent vertex lines is 600 μm. The pressing operation is performed by pressing an embossing roller which presses the intermediate film as described above, and the intermediate film A6 for laminated glass is obtained.

Comparative Example 1. Polyvinyl butyral interlayer film B1 without embossing operation

The polyvinyl butyral interlayer film of Production Example 1 was cut into a 35 cm × 35 cm square, and was directly used as the interlayer film B1 for laminated glass without an embossing procedure.

Comparative Example 2, an intermediate film B2 for laminated glass with concave line embossing

The polyvinyl butyral interlayer film of Production Example 1 was used in the same manner as in Example 1, except that the pressing conditions were an embossing roller temperature of 100 ° C, a pressure of 10 kg/cm ² , and the embossing rolls were replaced with a plurality of strips. The embossing roller of the parallel raised line embossing road is pressed, and the apex angle of the convex line is 30 degrees, the height of the apex angle is 280 μm from the roll surface, the width is 150 μm, and the distance between the apexes of adjacent convex lines is The film was subjected to a pressing operation in the same manner as in Example 1 at 600 μm to obtain an interlayer film B2 for laminated glass.

Comparative Example 3, intermediate film B3 for laminated glass with concave line embossing

The polyvinyl butyral intermediate film of Production Example 1 was used in the same manner as in Example 1, except that the pressing conditions were an embossing roll temperature of 90 ° C, a pressure of 10 kg/cm ² , and pressing using the embossing roll of Comparative Example 2. The apex angle of the convex line is 30 degrees, the height of the apex angle is 280 μm from the roll surface, the width is 150 μm, and the distance from the center point of the adjacent protrusion is 600 μm, and a pressing operation is performed to obtain an intermediate film B3 for laminated glass.

Comparative Example 4, interlayer film B4 for laminated glass with concave line embossing

The polyvinyl butyral interlayer film of Production Example 1 was used in the same manner as in Example 1, except that the pressing conditions were an embossing roller temperature of 130 ° C, a pressure of 30 kg/cm ² , and the embossing rolls were replaced with a plurality of strips. The embossing roller of the parallel embossing line is pressed, and the apex angle of the convex line is 90 degrees, the height of the apex angle is 100 μm from the roll surface, the width is 200 μm, and the distance from the center point of the adjacent protrusion is 600 um. The pressing operation was carried out to obtain an intermediate film B4 for laminated glass.

Comparative Example 5, intermediate film B5 for laminated glass with concave line embossing

The polyvinyl butyral intermediate film of Production Example 1 was used in the same manner as in Example 1, except that the pressing conditions were an embossing roll temperature of 120 ° C, a pressure of 20 kg/cm ² , and pressing using the embossing roll of Comparative Example 4. The apex angle of the convex line is 90 degrees, the height of the apex angle is 100 μm from the roll surface, the width is 200 μm, and the distance from the center point of the adjacent protrusion is 600 μm, and the pressing operation is performed to obtain the intermediate film B5 for the laminated glass.

In the above examples and comparative examples, the physicochemical properties and the venting properties of the interlayer film of the examples and comparative examples of the present invention were measured by the following methods.

A. Appearance: Cut 30cm square polyethylene butyral interlayer film, so that the embossed polyethylene butyral intermediate film is sandwiched between two pieces of automobile front windshield glass (purchased from Linshangqiang Strengthening Safety Glass Co., Ltd. , the product model 2.355W front windshield), and the laminated glass is vacuum-sealed to maintain the vacuum degree 0 torr, and placed in the oven to maintain the temperature at 130 degrees for 1.5 hours, then take out, to be cooled to the room After the temperature, the polyethylene butyral interlayer film after embossing was pressed with the front windshield glass of the automobile, and the residual original texture represents a poor press-fit state; if the original grain was not left, the pressed state was good.

B. Transparency (exhaustability): After processing the laminated glass with the above-mentioned A step, the transmittance of the laminated glass is measured by a spectrophotometer (label: Perkin Elmer, model: Lambda 40), and 100% is defined. The luminosity is not to place any sample, directly correct the air, to the value of air After the transmittance is 100%, the transmittance is divided into 9 levels, the measured transmittance is 90 to 99% for level 9, the transmittance is 80 to 89% for level 8, and so on, 0 to 19 % is level 1, in other words, 1 is the worst light transmission, and 9 is the best light transmission, as a basis for judging the exhaust property.

The interlayer films for laminated glass obtained in Examples 1 to 6 and Comparative Examples 1 to 3 were subjected to appearance, light transmittance, and SEM analysis, and the results are shown in Table 1 below.

As can be seen from the above Table 1, the arrangement of the multi-angle V-groove embossing paths of the first, second and third embodiments having different V-angle angles has the advantage that the corrugation phenomenon is less likely to occur. It can be seen from Examples 1 to 5 that the arrangement of the V-shaped groove embossing paths of different V-shaped angles does not affect the exhaust property and characteristics of the interlayer film, and from Examples 5 and 6 and Comparative Examples 2, 4 can be found, the multi-angle convex embossed road design, will not cause the embossing of the intermediate film to produce ripple phenomenon, because the multi-angle V-shaped groove causes different light refraction angles, and can avoid ripples According to the operating conditions of Example 6 and Comparative Example 4, the design of the multi-angle V-shaped groove of the present invention can reduce the operating condition temperature of 10 ° C and the pressure of 10 kg / cm ² , which not only saves energy. In addition to the advantages of spraying the release agent on the embossing roller and operating at lower temperature and pressure conditions, the service life of the release agent can be extended by about one month, which is another improvement advantage; however, from implementation In Examples 5 and 6 and Comparative Examples 3 and 5, it was also found that the same angle of the line embossing of Comparative Examples 3 and 5 was embossed under the same operating conditions of the same lower temperature and pressure embossing rolls. The effect is poor, resulting in reduced light transmission and possible compression Bubble, but the embodiment 5 and 6 as much as the design angle, can be maintained good light transmission, and having a multi-angle due to the exhaust passage, may have a good nip state.

In summary, the interlayer film for laminated glass according to the present invention has a multi-angle line-shaped concave embossing road on both sides, and the concave embossing road is a pattern arranged in a multi-angle manner, so the intermediate film does not have ripple phenomenon. Appearance, good workability at the time of cutting or mezzanine processing, and excellent degassing property in the pre-crimping process, and the temperature and pressure of the operating conditions can be lowered during the process, so that the extension of the embossing roller can be achieved. The life of the agent.

Moreover, since the present invention has the above-described configuration, the intermediate film for laminated glass provided does not require strict control of the deaeration start temperature in the pre-crimping process, and does not cause the peripheral portion to be sealed first, but can be exerted. Excellent degassing.

Further, since the intermediate film of the present invention has the above-described configuration, even when a laminated glass having a large area or a laminated glass having a large curvature is used or when the productivity of the laminated glass is improved, the obtained The laminated glass can be sufficiently carried out on the degassing, the sealing of the glass plate and the interlayer film, and the glass plate and the middle are caused by the intrusion of pressurized air from the bad sealing portion when the pressure is applied in the autoclave for the final pressure bonding. The occurrence of bubbles between the films is also improved in the case of poor quality, and is particularly excellent in transparency.

Therefore, according to the interlayer film for laminated glass according to the present invention, good degassing and sealing can be performed in a wide temperature range in the pre-crimping process, and the pre-crimping temperature can be easily managed, and the workability of the interlayer processing is remarkable. The advantages of upgrading. Even if it is various kinds of users and various processing conditions, it can be easily and efficiently matched. Therefore, the interlayer film for laminated glass according to the present invention is excellent not only in the production of the interlayer but also under strict conditions. It is suitable for high-quality laminated glass of poor quality due to the occurrence of air bubbles, and is applicable to window glass of automobiles, aircraft, buildings, and the like.

Claims (9)

An interlayer film for laminated glass, which is formed by embossing on both sides of a sheet formed of a thermoplastic resin, so that each surface has a plurality of V-shaped grooves, and the V-shaped grooves can be equal in length or Unequal length, and the angle of the V-shaped angle is between 25 and 90 degrees, the angle of the V-shaped angle of each adjacent V-shaped groove is different, and the depth of the V-shaped groove is about 30 μm to 300 μm; the width of the V-shaped groove Approximately 30 μm to 150 μm and a horizontal distance of each adjacent V-shaped groove is about 16 μm to 600 μm. An interlayer film for laminated glass according to claim 1, wherein the V-shaped groove has a depth of about 30 μm to 150 μm; the V-shaped groove has a width of about 30 μm to 130 μm; and a horizontal distance of each adjacent V-shaped groove is about 300 μm to 600 μm. The interlayer film for laminated glass according to claim 2, wherein the V-shaped groove has a depth of about 30 μm to 145 μm; the V-shaped groove has a width of about 30 μm to 130 μm; and a horizontal distance of each adjacent V-shaped groove is about 600 μm. The interlayer film for laminated glass according to any one of claims 1 to 3, wherein the thermoplastic resin sheet has a thickness of about 0.2 to 2 mm. The interlayer film for laminated glass according to any one of claims 1 to 3, wherein the thermoplastic resin sheet is composed of polyvinyl butyral. A laminated glass having at least two sheets of glass and an interlayer film for sandwich glass according to claim 1 interposed therebetween. A method for avoiding corrugation of an interlayer film for a laminated glass on a rough surface and improving degassing of the interlayer film, comprising forming a plurality of V-shaped grooves on the intermediate film, the V-shaped grooves being equally long on both sides Or the unequal length, the angle of the V-shaped angle is between 25 and 90 degrees, the angle of the V-shaped angle of each adjacent V-shaped groove is different, and the depth of the V-shaped groove is about 30 μm to 300 μm; the V-shaped groove The width is about 30 μm to 150 μm and the horizontal distance of each adjacent V-shaped groove is about 16 μm to 600 μm. The method of claim 7, wherein the V-shaped groove has a depth of about 30 μm to 150 μm; the V-shaped groove has a width of about 30 μm to 130 μm and the horizontal distance of each adjacent V-shaped groove is about 300 μm to 600 μm. The method of claim 8, wherein the V-shaped trench has a depth of about 30 μm to 145 μm; the V-shaped trench has a width of about 30 μm to 130 μm and a horizontal distance of each adjacent V-shaped trench is about 600 μm.