KR20210025332A - Film for bonding and light transmitting layered product comprising of the same - Google Patents

Abstract

An embodiment relates to a bonding film, a light-transmitting laminate including the same, and the like. The disclosed bonding film has an embossed surface, wherein a value A2/A1 of the embossed surface is 1 or less. The characteristics of the embossed surface of the bonding film are controlled to improve degassing stability, edge sealing properties, and the like when forming the light-transmitting laminate.

Description

Bonding film and light-transmitting laminate comprising the same {FILM FOR BONDING AND LIGHT TRANSMITTING LAYERED PRODUCT COMPRISING OF THE SAME}

The embodiment relates to a bonding film, a light-transmitting laminate including the same.

Polyvinyl acetal is used as a laminated glass (safety glass) or an intermediate layer of a light-transmitting laminate (a film for laminated glass). Laminated glass is mainly used for windows, exterior materials of buildings, and automobile window glass, and its fragments do not scatter even when damaged, and do not allow penetration even with a certain strength of blow. Loss can be secured with stability to minimize damage or injury.

When the bonding film is used as a film for a head-up display, a film having a wedge angle having a constant wedge in cross section may be applied to prevent the formation of a double image.

Bonding film prevents blocking between intermediate layers on its surface, improves handling workability when overlapping glass plates and intermediate layers (slip property with glass plates), and de-airing stability during bonding with glass plates (De-Airing). For this purpose, a number of fine embosses are formed.

When an embossed bonding film is used for bonding, interference fringes or bubbles may occur in the laminated glass due to the influence of embossing located on both sides of the film, and visibility may decrease. In addition, when glare occurs, there is a problem that workability is deteriorated.

Korean Patent Registration No. 10-1376061 Japanese Patent Application Laid-Open No. 2001-220183

The purpose of the embodiment is a bonding film capable of improving de-airing stability and edge sealing characteristics, and suppressing double images in a head up display, and a light-transmitting lamination including the same It is to provide a sieve and the like.

In order to achieve the above object, the bonding film according to an embodiment disclosed in the present specification includes a side on which an emboss is formed, and the A2/A1 value of the side on which the emboss is formed is 1 or less.

The bonding film includes a thickness increase area.

The thickness increasing region has both ends of one end and the other end, and the both ends have different thicknesses.

In the bonding film, the wedge angle θ is represented by Equation 1 below, and the wedge angle in the thickness increase region may be 0.01 to 0.04°.

[Equation 1]

In Equation 1 above,

The Hb is the thickness of the thicker side of the both ends of the thickness increase region,

Ha is the thickness of the thinner side of the both ends of the thickness increase region,

The w is a width length connecting both ends of the thickness increasing region.

The ratio of Ha to the w may be 0.0002 or more and 0.0015 or less.

In the bonding film, the thickness increase region may be located on a part or all of the bonding film.

The Sz value of the embossed surface may be 30 um or more and 90 um or less.

The Sz value of the embossed surface may be 40 um or more and 80 um or less.

The A1 value may be 0.5 or more.

The A2 value may be 0.6 or less.

The bonding film may be a single layer film of one layer or a laminated film of two or more layers.

The bonding film may contain a polyvinyl acetal resin.

The bonding film may include a sound insulation layer.

A light-transmitting laminate according to another embodiment includes a first light-transmitting layer, a bonding film disposed on one surface of the first light-transmitting layer, and a second light-transmitting layer disposed on the bonding film.

The bonding film includes an embossed surface.

The A2/A1 value of the embossed surface is 1 or less.

The bonding film includes a thickness increase area.

The thickness increasing region has both ends of one end and the other end, and the both ends have different thicknesses.

In the light-transmitting laminate, the total number of bubbles generated in three light-transmitting laminates having a horizontal length of 900 mm and a vertical length of 300 mm may be 5 or less.

Any one selected from the group consisting of the first transmission layer, the second transmission layer, and a combination thereof may be an aged glass.

The moving means according to another embodiment includes the light-transmitting laminate.

The bonding film of the present embodiment, the light-transmitting laminate including the same, improves degassing stability and edge sealing properties when forming a light-transmitting laminate by controlling the characteristics of the embossed surface, and prevents the occurrence of double images in laminated glass. It is possible to provide a film for bonding that can be suppressed.

1 and 2 are cross-sectional views schematically showing a bonding film according to an embodiment, respectively.
3 is a cross-sectional view schematically showing bonding films including a sound insulation layer according to different embodiments in a), b) and c).
4 is a conceptual diagram illustrating an emboss roller applied in the manufacturing process of the bonding film of the comparative example.
5 is a conceptual diagram illustrating a process of forming a surface emboss in the manufacturing process of the bonding film manufactured in an embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. Like reference numerals are attached to similar parts throughout the specification.

The terms "about", "substantially", etc. of the degree used in the present specification are used at or close to the numerical value when manufacturing and material tolerances specific to the stated meaning are presented, and to aid understanding of the embodiments. In order to avoid unreasonable use by unscrupulous infringers of the stated disclosures, either exact or absolute figures are used.

Throughout this specification, the term "combination of these" included in the expression of the Makushi format refers to one or more mixtures or combinations selected from the group consisting of the components described in the expression of the Makushi format, and the constituent elements It means to include one or more selected from the group consisting of.

Throughout this specification, the description of “A and/or B” means “A, B, or A and B”.

Throughout this specification, terms such as “first”, “second” or “A” and “B” are used to distinguish the same terms from each other unless otherwise specified.

In the present specification, the meaning that B is located on A means that B is located on A or that B is located on A while another layer is located between them, and B is located in contact with the surface of A. It is limited to that and is not interpreted.

In the present specification, the singular expression is interpreted as meaning including the singular or plural, which is interpreted in context, unless otherwise specified.

In the present specification, the size of each component in the drawings may be exaggerated for the purpose of describing the invention, and may be different from the size that is actually applied.

The evaluation of the amount of hydroxyl groups in the present specification was evaluated by measuring the amount of ethylene groups to which the hydroxyl groups of the polyvinyl acetal resin are bound in a method in accordance with JIS K6728.

In this specification, the values of A1 and A2 are evaluated according to ISO_25178.

The A1 and A2 values are values derived from the real material ratio curve (Abbott-Firestone curve) graph and can be measured by a 3D illuminometer.

The substance ratio curve is a curve shown by mathematically converting the surface contour height of an object into a cumulative probability density function, and is one of the methods of expressing the surface characteristics of an object.

The A1 (Peak cross-sectional area) value means the area of a triangle with the value from 0% to Smr1 as the base and the Spk value as the height in the real ratio curve graph.

A2 (Valley cross-sectional area) refers to the area of a triangle with the Smr2 value as the base and the Svk value as the height in the real ratio curve graph.

For the substance ratio curve, the equivalence line is applied. The equivalent straight line is a straight line including 40% of the measurement points of the curve, and the slope is minimized when connecting both end points of the section by arbitrarily setting a section of 40% of the total section of the Areal material ratio in the curve. It means a straight line. Values representing surface characteristics, such as Sk, Smr1, Smr2, Spk, and Svk values, may be derived through the isolinear line.

The Sk (Core height) value is a value evaluated according to ISO_25178.

In the entity ratio curve, the equivalent straight line intersects the axis at 0% entity ratio (Y axis) and the axis at 100% entity ratio (axis parallel to Y axis). You can set the line. A line parallel to the X axis including the intersection of the isometric line and the axis (Y axis) at 0% of the entity ratio is L1, and the intersection point of the isoline line and the axis (axis parallel to the Y axis) at 100% of the entity ratio Including and when the line parallel to the X axis is L2, the Sk value means the vertical distance between the L1 and the L2.

The Smr1 (Peak material portion, %) value is a value evaluated according to ISO_25178, and refers to the actual ratio of the intersection of the curve and L1.

The value of Smr2 (Valley material portion, %) is a value evaluated according to ISO_25178, and indicates the actual ratio of the intersection point of the curve and the L2.

The Spk (reduced peak height) value is a value evaluated according to ISO_25178, and the difference between the height at the measuring point corresponding to 0% of the substance ratio in the substance ratio curve and the height of the equivalent straight line at 0% substance ratio Means value.

The Svk (Reduced valley depth) value is a value evaluated according to ISO_25178, and means the difference between the height at the measurement point corresponding to 100% of the entity ratio in the entity ratio curve and the height of the equivalent straight line at 100% entity ratio. do.

The bonding film can be bonded to a light-transmitting body such as a glass plate to form a light-transmitting laminate. An image may be projected onto the light-transmitting stack to provide a head-up display to a user (driver). However, the image projected onto the light-transmitting laminate may form a double image by transmitting or reflecting each of the light-transmitter such as glass and the bonding film, which is perceived as a ghost image to the user or deteriorates the sharpness of the image. . In order to suppress this phenomenon, a bonding film in the form of a Ÿ‡ paper is applied for a head-up display.

On the other hand, the bonding film provides surface embossing characteristics such as a certain irregular pattern or melt fracture in order to prevent unnecessary bonding between the surface and the surface when winding, and to impart degassing performance when bonding with a light-transmitting body such as a glass plate. However, if only the degassing performance is emphasized, the optical characteristics may be deteriorated or the edge sealing characteristics may be insufficient, and if the edge sealing characteristics, etc. are emphasized, the optical characteristics may be rather deteriorated due to problems such as bubble generation.

The pre-joining is generally performed at a lower temperature than the main bonding, and in the case of a process using a nip roll than the pre-joining process using a vacuum ring, the temperature actually received by the glass is relatively lower. Pre-bonding proceeds below about 70°C based on the temperature of the glass surface.

When pre-joining is performed at a low temperature, it is common to simply lower the roughness of the emboss pattern to secure fairness in order to obtain stable bonding performance, but this also acts as one of the causes of deteriorating the deairing performance.

When forming a light-transmitting laminate such as laminated glass, the present inventors control the wedge angle of the bonding film to suppress the formation of a double image of the head-up display image, and control the A1 and A2 properties of the embossed surface to prevent degassing. The implementation example was completed after confirming that all complementary features of edge sealing can be satisfied.

1 and 2 are cross-sectional views schematically showing a bonding film according to an embodiment, respectively, and FIG. 3 is for bonding including a sound insulation layer according to different embodiments in (a), (b) and (c). It is a cross-sectional view schematically showing films. Hereinafter, the embodiments will be described in more detail with reference to FIGS. 1 to 3.

In order to achieve the above object, the bonding film 100 according to an embodiment disclosed in the present specification includes an embossed surface (not shown), and the A2/A1 value of the embossed surface is 1 or less. .

The bonding film 100 includes a thickness increase area A, the thickness increase area A has both ends of one end and the other end, and the both ends have different thicknesses.

The values of A1 and A2 are evaluated according to ISO_25178.

The values of A1 and A2 can be derived from the real material ratio curve (Abbott-Firestone curve). The A1, A2 values, etc. may be measured and calculated using a three-dimensional illuminance meter.

The measurement of the 3D illuminance may be evaluated as an average value of values ^{measured in a total area of 1,000,000 um 2 or more.} Specifically, when measuring using a 3D optical profiler or a 3D laser measuring microscope, measure ^{at least 5 times with an area of 340,000 um 2} or more at different locations, and calculate the average of the values excluding the highest and lowest values by 3 It can be applied as a measure of dimensional roughness. In the case of using a 3D laser measuring microscope, 3D illuminance can be measured by splicing images of neighboring locations using the stitching function, and the measurement of 3D illuminance using this stitching function is also a total ^{area of 1,000,000 um 2} or more. It can be evaluated as the average of the values measured at.

For example, it can be obtained by measuring 3D illuminance in VSI Mode (Vertical scanning Interferometry) using a non-contact 3D illuminometer (3D Optical Microscopy, model Contour GT) of Bruker.

The bonding film 100 may include an embossed surface, and the A2/A1 value of the embossed surface may be 1 or less. The A2/A1 value may be 0.85 or less. In addition, the A2/A1 value of the embossed surface may be greater than or equal to 0.02. The A2/A1 value may be 0.05 or more. When the A2/A1 value of the embossed surface is 1 or less, the edge sealing property can be improved while substantially maintaining the degassing stability equal or higher. In addition, when the A2/A1 value of the embossed surface is within the range mentioned above, the bulk density of the upper and lower portions of the embossed surface is appropriately adjusted to substantially improve the edge sealing characteristics even at relatively low temperatures without a change in roughness. I can make it.

In the bonding film 100, the A1 value of the side on which the emboss is formed may be 0.5 or more. The A1 value may be 0.6 or more. In addition, the A1 value of the embossed surface may be 3 or less. The A1 value may be 2 or less. When the A1 value is 0.5 or more, the peak of the embossed surface may be controlled to be maintained at a predetermined volume or more, and the bonding film may have stable degassing performance and edge sealing property.

The A2 value of the side on which the emboss is formed in the bonding film 100 may be 0.6 or less. The A2 value may be 0.5 or less. The A2 value of the embossed surface may be 0.05 or more. The A2 value may be 0.1 or more. When the A2 value is less than 0.6, the volume of voids in the valleys of the surface pattern of the bonding film is small, so that the amount of air to be degassed can be adjusted to an appropriate level or less, and the degassing stability can be more excellent. have.

The bonding film 100 includes a thickness increase region (A).

The thickness increasing region A has both ends of one end and the other end when viewed in cross section, and the thicknesses of the both ends are different from each other.

The thickness increase region A may increase in thickness from one end toward the other end. The thickness may be increased at a constant rate throughout the thickness increase area (A). The thickness may increase at a rate that gradually increases over the entire thickness increase area A. The increase in the thickness may increase at a rate that gradually decreases over the entire thickness increase area A.

The thickness increase area A may decrease in thickness from one end toward the other end. The thickness may be reduced at a constant rate throughout the thickness increase area (A). The thickness may decrease at a rate gradually increasing over the entire thickness increase area A. The increase in the thickness may decrease at a rate that gradually decreases over the entire thickness increase area A.

By varying the thickness of both ends in the thickness increase area (A), a double image is formed when the light source of the head-up display system irradiates light toward the light-transmitting stack by adjusting the path of transmitted light or the angle of reflected light. You can avoid it.

The thickness increase region A has a wedge angle θ, the wedge angle θ is expressed by Equation 1 below, and the wedge angle in the thickness increase region A may be 0.01° or more and 0.04° or less. .

[Equation 1]

In Equation 1 above,

The Hb is the thickness of the thicker side of the both ends of the thickness increase region (A),

Ha is the thickness of the thinner side of the both ends of the thickness increase region (A),

The w is a width length connecting the both ends of the thickness increasing region (A).

The Hb value and the Ha value may be measured using a Mitsutoyo 547-401 thickness gauge, but the center thickness and the average thickness are not limited thereto.

The wedge angle in the thickness increase region (A) may be 0.01° or more. The wedge angle in the thickness increase region A may be 0.04° or less. The wedge angle in the thickness increase region A may be 0.011° or more. The wedge angle in the thickness increase region A may be 0.03° or less. When the bonding film having such a wedge angle is used as an intermediate film for a head-up display, it is possible to effectively suppress the formation of a double image.

The ratio of the Hb to the w may be 0.001 or more and 0.002 or less.

The ratio of Ha to the w may be 0.0002 or more and 0.0015 or less.

The specific measurement method of the Ha value and the Hb value is the same as the method described above.

Specifically, the Ha value may be 0.38 mm or more. In addition, the Ha value may be 0.40 mm or more. When the Ha value is 0.38 mm or more, the bonding film may have stable penetration resistance.

The ratio of Hb to w may be 0.001 or more and 0.002 or less. In addition, the ratio of Hb to w may be 0.001 or more and 0.0018 or less. When the ratio of Hb to w has the above range, it is possible to provide a bonding film having excellent impact resistance and penetration resistance, and having a double-image prevention function.

The ratio of Ha to w may be 0.0002 or more and 0.0015 or less. In addition, the ratio of Ha to w may be 0.0003 or more and 0.0013 or less. When the ratio of Ha to w is in the above range, it is possible to provide a bonding film having both penetration resistance and double-image prevention function.

The thickness increase area (A) may be located on a part or all of the bonding film 100.

When the thickness increase area A is located on a part of the bonding film 100, the thickness increase area A may be located at an edge of the bonding film 100.

The bonding film 100 may include one or two or more of the thickness increasing regions (A).

The bonding film 100 may have an Sz value of 30 um or more and 90 um or less of the surface on which the emboss is formed.

The Sz value is a value evaluated according to ISO_25178, refers to a sum of a maximum peak height value and a maximum valley depth value, and refers to a difference in height between the peak and valley.

The Sz value can be measured and calculated using a three-dimensional illuminometer, for example, using a non-contact three-dimensional illuminometer (3D Optical Microscopy, model Contour GT) from Bruker, VSI Mode ( Vertical scanning interferometry) can be obtained by measuring 3D illuminance.

The bonding film 100 may have an Sz value of 30 um or more and 90 um or less of the surface on which the emboss is formed. The Sz value may be 40 um or more and 80 um or less. The Sz value may be 45 um or more and 75 um or less. The bonding film having such a surface embossing property can have a sufficient degassing property in the height distribution of the surface irregularities.

The bonding film, where the Sz value of the surface on which the empo is formed, has the value described above, and the A2/A1 value, has the characteristics described above, has excellent degassing stability even when pre-bonding is applied at a low temperature and at the same time further improves the edge sealing property. I can make it.

The bonding film 100 may be a single layer film or a multilayer film.

When the bonding film 100 is a single layer film, the bonding film may be formed of a bonding layer 10.

The bonding film 100 may include a polyvinyl acetal resin, and may include a polyvinyl acetal resin and a plasticizer.

Specifically, the bonding film 100 may contain a polyvinyl acetal resin in an amount of 60% by weight or more and 76% by weight or less, 70% by weight or more and 76% by weight or less, and 71% by weight or more and 74% by weight. It may include as follows. When the polyvinyl acetal resin is included in this range, relatively high tensile strength and modulus may be provided to the laminated film for bonding.

The polyvinyl acetal resin may have an acetyl group content of less than 2% by weight, and specifically 0.01 or more and less than 1.5% by weight. The polyvinyl acetal resin may have a hydroxyl group content of 15% by weight or more, 16% by weight or more, and 19% by weight or more. In addition, the polyvinyl acetal resin may have a hydroxyl group content of 30% by weight or less.

When a polyvinyl acetal resin having such properties is applied to the bonding film, it can have mechanical properties such as adequate penetration resistance while being excellently bonded to a substrate such as glass.

The polyvinyl acetal resin may be a polyvinyl acetal resin obtained by acetalizing a polyvinyl alcohol having a polymerization degree of 1,600 or more and 3,000 or less with an aldehyde, and a polyvinyl acetal obtained by acetalizing a polyvinyl alcohol having a polymerization degree of 1,700 or more and 2,500 or less with an aldehyde. It can be resin. When such a polyvinyl acetal resin is applied, mechanical properties such as penetration resistance of the bonding film can be sufficiently improved.

The polyvinyl acetal resin may be obtained by synthesizing polyvinyl alcohol and aldehyde, and the type of the aldehyde is not limited. Specifically, the aldehyde may be any one selected from the group consisting of n-butyl aldehyde, isobutyl aldehyde, n-barrel aldehyde, 2-ethyl butyl aldehyde, n-hexyl aldehyde, and blend resins thereof. When n-butyl aldehyde is applied as the aldehyde, the prepared polyvinyl acetal resin may have a refractive index characteristic with a small difference from the refractive index of glass, and may have excellent bonding strength with glass.

The bonding film 100 may contain the plasticizer in an amount of 24% by weight or more and 40% by weight or less, 24% by weight or more and 30% by weight or less, and 26% by weight or more and 29% by weight or less. . When the plasticizer is included in such a range, it is good in that it can impart appropriate bonding strength and impact resistance to the laminated film for bonding.

Specifically, as the plasticizer, triethylene glycol bis 2-ethylhexanoate (3G8), tetraethylene glycol diheptanoate (4G7), triethylene glycol bis 2-ethyl butyrate (3GH), triethylene glycol bis 2-heptide The group consisting of tanoate (3G7), dibutoxyethoxyethyl adipate (DBEA), butyl carbitol adipate (DBEEA), dibutyl sebacate (DBS), bis 2-hexyl adipate (DHA), and combinations thereof Any one selected from may be applied, and specifically, triethylene glycol di-2-ethyl butylate, triethylene glycol di-2-ethylhexanoate, triethylene glycol di-n-heptanoate, and combinations thereof. It may include any one selected from the group, more specifically triethylene glycol bis 2-ethylhexanoate (3G8) may be applied.

The bonding film 100 may further include additives as necessary, and illustratively, the additives are from the group consisting of antioxidants, heat stabilizers, UV absorbers, UV stabilizers, IR absorbers, glass adhesion modifiers, and combinations thereof. It can be any one selected.

The antioxidant may be a hindered amine type or a hindered phenol type. Specifically, a hindered phenolic antioxidant is more preferred in the process of manufacturing polyvinyl butyral (PVB) requiring a process temperature of 150°C or higher. As the hindered phenolic antioxidant, for example, BASF's IRGANOX 1076, 1010, or the like can be used.

The thermal stabilizer may be a phosphite-based thermal stabilizer in consideration of compatibility with an antioxidant. For example, BASF's IRGAFOS 168 can be used.

As the UV absorber, Chemisorb 12, Chemisolve 79, Chemisolve 74, Chemisolve 102, BASF's Tinuvin 328, Tinuvin 329, Tinuvin 326, etc. may be used as the UV absorber. The UV stabilizer may be used, such as BASF's Tinuvin. ITO, ATO, AZO, etc. may be used as the IR absorber, and a metal salt such as Mg, K, Na, etc., an epoxy-based modified Si oil, or a mixture thereof may be used as the glass adhesion modifier, but is not limited thereto. .

The bonding film 100 may be a multilayer film. The bonding film 100 may be a laminate of two or more layers, a laminate of three or more layers, and a laminate of five or more layers. The multilayer film may include bonding layers 10 and 11 in direct contact with a light-transmitting laminate such as a glass plate, and a core layer (not shown) separated from the bonding layers 10 and 11. The core layer may have functionality, and for example, may have functionality such as a heat shielding function layer.

The multilayer film may include a polyvinyl acetal resin corresponding to the composition of the single layer film described above in at least one layer including the bonding layers 10 and 11, and may include a polyvinyl acetal resin and a plasticizer. . Since the description of the polyvinyl acetal resin and the plasticizer is duplicated with the above description, the description thereof will be omitted.

The bonding film 100 may include a sound insulation layer 20. The sound insulation layer 20 may be positioned between the bonding layers 10 and 11, and may be positioned on one surface of the bonding layer 10.

The sound insulation layer 20 may include polyvinyl acetal resin.

The sound insulation layer 20 may include 54% by weight or more and 76% by weight or less of a polyvinyl acetal resin, and may include 60% by weight or more and 70% by weight or less.

The sound insulation layer 20 may include 24% by weight or more and 46% by weight or less of a plasticizer, and may include 30% by weight or more and 40% by weight or less.

The polyvinyl acetal resin included in the sound insulation layer 20 may have an acetyl group content of 8 mol% or more, and specifically 8 mol% or more and 30 mol% or less. In addition, the polyvinyl acetal resin included in the sound insulating layer 20 may have a hydroxyl group content of 26 mol% or less, and may be 10 wt% or more and 25 wt% or less. In this case, it is possible to impart more stable sound insulation properties to the bonding film.

The bonding film 100 may be prepared in a sheet shape by extruding a composition for producing a bonding film including a resin, a plasticizer, and an additive, if necessary, and molding through T-DIE. When the bonding film is a multilayer film, a lamination means such as a feed block may be further applied to the front end of the T-DIE.

The bonding film 100 manufactured in the form of a sheet may be manufactured as a bonding film through processes such as thickness control and embossing, but the manufacturing method of the bonding film of the embodiment is not limited to this method.

When the bonding film 100 has the characteristics of the surface on which the emboss is formed as described above and the characteristics of the thickness increase region (A) at the same time, it has a double-image prevention function as well as a surface bonding characteristic.

In particular, when the thickness increase region (A) is partially present in the bonding film 100, a bent portion in which the surface angle of the bonding film rapidly changes occurs, and in this portion, a light transmitting body such as a glass plate When appropriate, air bubbles can easily occur. However, the bonding film having the characteristics of the embodiment can provide a bonding film having both excellent optical properties and excellent double-image prevention functionality while controlling the generation of air bubbles as a whole in the bonding film including such a bent portion.

4 is a conceptual diagram illustrating an emboss roller applied in the manufacturing process of the bonding film of a comparative example, and FIG. 5 is a conceptual diagram illustrating a process of forming a surface emboss in the manufacturing process of the bonding film manufactured in an embodiment. Hereinafter, a method of manufacturing a bonding film having a surface embossing of the embodiment will be described with reference to FIGS. 4 to 5.

The single-layer film or multi-layer film 100 is manufactured in a sheet shape in the same manner as described above, and then the emboss roller 500 is applied to form a surface emboss of the film, and the film 100 for bonding is manufactured.

The surface characteristics of the emboss roller 500 are transferred to the surface of a single-layer film or a multi-layer film by applying a method of heating and pressing, which is usually applied to the bonding film 100, and at this time, the transfer rate may be 0.6 or more, and may be 0.7 or more. Yes, and may be 0.99 or less. The transfer rate is evaluated as the surface roughness of the corresponding film surface when the surface roughness of the emboss is 1.

Since the surface characteristics of the emboss roller 500 are complementarily transferred to the film surface, the surface characteristics of the emboss roller may be controlled to control the characteristics of the surface on which the film emboss is formed.

The embossing roller 500 is a method of performing a grit blast treatment on the concave portion of the basic roller (applied to Comparative Example 1) as shown in FIG. 3 and a grinding treatment on the convex portion. Can be manufactured. At this time, the surface characteristics can be controlled by adjusting the conditions applied during the grit blast treatment (particle size, spray pressure, spray distance, spray angle, etc.) and the conditions applied during the grinding treatment (degree of grinding), which is complementary. It is reflected as the embossing property of the film surface.

Exemplarily, particles with an average outer diameter of 3 um or more and 8 um or less are placed in the concave portion of the basic roller having an Rz roughness value of 30 um or more and 90 um or less with irregularities in the form of a matte pattern, 40 cm or more and 45 cm or less. At a distance of 0.3 MPa or more and 0.5 MPa or less, spray directly with a spraying pressure of 0.3 MPa or more and 0.5 MPa or less, but the grid blast treatment can be applied 1 to 10 times by applying the angle of the nozzle to 85° to 105°. A fine pattern is formed on the convex portion of the film surface complementarily through the grit blast treatment of the concave portion, so that the volume A1 of the convex portion on the film surface can be relatively increased.

In addition, it is possible to grind the convex portions of the basic roller, and the grinding thickness may be applied in a range of 1 um or more and 5 um or less. The grinding thickness may be applied in a range of 1um or more and 3um or less. Through the grinding treatment of the convex portions, the voids between the concave portions on the film surface may be complementarily narrowed, and degassing stability may be further improved.

A light-transmitting laminate (not shown) according to another embodiment disclosed in the present specification includes a first light-transmitting layer (not shown), a bonding film 100 positioned on one surface of the first light-transmitting layer, and It includes a second light-transmitting layer (not shown) positioned on the bonding film.

The first light-transmitting layer and the second light-transmitting layer may each independently be a light-transmitting glass or a light-transmitting plastic.

As the bonding film, the bonding film 100 described above is applied, and a detailed description thereof will be omitted since it overlaps with the above description.

In the light-transmitting laminate, the total number of bubbles generated in three light-transmitting laminates having a horizontal length of 900 mm and a vertical length of 300 mm may be 5 or less. A detailed description of the condition and method for measuring the number of bubbles in the light-transmitting laminate is duplicated with the description of the following evaluation example, and thus description thereof will be omitted.

In the light-transmitting laminate, any one selected from the group consisting of the first transmission layer, the second transmission layer, and a combination thereof may be an aged glass.

In the case of general glass, due to the influence of ambient temperature and humidity, scale is formed on the surface over time, resulting in a decrease in flatness, leading to a decrease in edge sealability. Specifically, by applying the glass aged for a certain period at a certain temperature and a certain relative humidity as the light-transmitting layer (the first light-transmitting layer or the second light-transmitting layer), the light-transmitting laminate after causing scale generation on the surface By applying to the manufacture of, it can be confirmed whether the bonding film has excellent edge sealing properties even under severe conditions.

The aging may be performed by leaving the glass for 60 days at 25°C and 40rh (relative humidity)% conditions.

Even when the aged glass is applied, the fact that the light-transmitting laminate has excellent edge sealing properties is considered to be an excellent effect that can be obtained by controlling surface properties such as A2/A1 values of the bonding film of the embodiment.

The moving means according to another embodiment disclosed in the present specification includes the light-transmitting laminate described above. The moving means comprises a body part forming the main body of the moving means, a drive part (engine, etc.) mounted on the body part, a drive wheel (wheel, etc.) rotatably mounted on the body part, and a connection between the drive wheel and the drive part. A connecting device; And a windshield, which is a light-transmitting laminate mounted on a part of the body to block wind from the outside.

Hereinafter, specific embodiments disclosed in the present specification will be described in more detail. In the description of the experiment below, when it is unclear whether the unit is% by weight or mole% with respect to the unclear% description, it means% by weight.

Manufacturing example: processing of rollers

An additional fine pattern was formed in the concave portion on a steel roller having an embossed shape, which is a matte pattern in which dots are formed at random, and the convex portion was subjected to grinding treatment.

As shown in FIG. 3, a roller (Rz = 50 um) having random irregularities in the form of a matte pattern was applied as ROLL 0.

The same roller as ROLL 0 was subjected to grit blasting treatment on the concave portion and grinding treatment on the convex portion to produce ROLL 1, ROLL 2, and ROLL 3, respectively. Specifically, the concave portion of the mat pattern was subjected to grit blasting, and the peak of the mat pattern was subjected to grinding. In the grit blast treatment, particles having an average outer diameter of 5 um were sprayed through a 200 mesh foreign matter removal filter at a distance of 40 cm or more and 45 cm or less at a spray pressure of 0.4 MPa in a direct pressure manner. The angle between the mold surface and the spray particles (or nozzles) was applied at 85° or more and 105° or less.

ROLL 1 performed the above grit blasting and grinding treatment once, and ROLL 2 performed the above grit blasting and grinding treatment 3 times. And ROLL 3 performed the above grit blasting and grinding treatment 10 times.

The rollers thus produced were applied to Examples or Comparative Examples as shown in Table 1 below.

Preparation Example: Preparation of a film

Each component used in the following examples and comparative examples is as follows.

Polyvinyl butyral resin (A) : Polyvinyl buty with 1700 polymerization degree and 99 saponification degree, PVA and n-BAL with a degree of saponification of 99, followed by a normal synthesis process, with a hydroxyl group of 19.6 wt%, a butyral group of 80.0 wt%, and an acetyl of 0.4 wt% Ral resin was obtained.

Polyvinyl butyral resin (B) : Polyvinyl with 8.6 wt% of hydroxyl group, 79.9 wt% of butyral group and 11.5 wt% of acetyl group by introducing PVA and n-BAL with a degree of polymerization of 2400 and a degree of saponification of 88. Obtained butyral resin.

Preparation of additives: 0.1 parts by weight of Irganox1076 as an antioxidant, 0.2 parts by weight of TINUVIN-328 as a UV absorber, and 0.03 parts by weight of Mg Acetate as a bonding strength control agent were mixed so as to be sufficiently dispersed in a tumbler (total 0.33 parts by weight).

Examples 1 to 3: 72.67 wt% of polyvinyl butyral resin (A), 3 g8 of 27 wt% as a plasticizer, and 0.33 wt% of additives were added to one twin screw extruder (a), and polyvinyl butyral resin (B) 65wt% and 3g8 35wt% as a plasticizer was added to another twin-screw extruder (b) and coextruded. While forming in the form of (A) composition/(B) composition/(A) composition through the feed block, a film having a thickness of one end being thicker than that of the other end was manufactured through T-DIE. Before winding, as shown in Table 1 below, different rollers (ROLL 1, ROLL 2, ROLL 3) were applied to the top and bottom, and the film transferred the surface pattern through separate embossing was sampled in the form of a roll sample. The films of Examples 1 to 3 were prepared. At this time, in order to facilitate the transfer of the surface pattern of the film, the transfer was performed by adjusting the angle of both sides of the emboss roll to 0.014°.

Comparative Example 1: A film of Comparative Example 1 was prepared in the same manner as in Examples 1 to 3 above, except that an embossing treatment was performed using a roller (ROLL 0) not subjected to additional fine pattern processing of the upper and lower portions.

Evaluation Example: Evaluation of physical properties

Measurement of wedge angle

In the evaluation film sample, since the thickness increase region corresponds to the entire film, the thicknesses of both ends were measured and applied as Ha and Hb values. Specifically, the thickness of both ends was measured using a Mitsutoyo 547-401 thickness gauge.

After measuring the width and length connecting both ends of the evaluation film sample, the measured Ha value, Hb value, and w value were substituted into Equation 1 below to obtain a wedge angle measurement value.

[Equation 1]

In Equation 1, Hb is the thickness of the thicker one of the both ends of the thickness increase region, Ha is the thickness of the thinner one of the both ends of the thickness increase region, and w is the thickness increase region It is the width and length connecting the both ends of.

Measurement of surface roughness

A1 value and A2 value were measured according to ISO_25178 through a 3D illuminance measuring device. Specifically, 3D illuminance was measured in VSI Mode (Vertical scanning Interferometry) using a non-contact 3D illuminometer (3D Optical Microscopy, model Contour GT) of Bruker.

Specifically, the measurement was performed using an eyepiece 2x objective lens 5x. In this case, the length of the x-axis was 0 to 0.887mm, and the y-axis was able to scan an area of 0 to 0.670mm. In the same pattern, the measurement area was randomly determined and the measurement was repeated 5 times, and the measurement values were obtained by averaging the three measurement values excluding the highest and lowest values.

The measurement results Sz, A1 (peak area), A2 (valley area), and A2/A1 values are shown in Table 1 below.

Edge sealing evaluation: edge sealing

Preparation of Samples for Evaluation 1) After cutting the films of Examples and Comparative Examples in width*length 1000*1000mm, aging was performed by leaving them at 20°C and 20rh (relative humidity)% for 2 days. A specimen was sampled at 900*300mm based on the central part in the width direction of the film, and three specimens were cut in the length direction in the same manner.

The specimen was pre-bonded by placing the specimen between two sheets of 2.1 T (T = mm) thick flat glass to prepare three samples for evaluation for each of the Examples and Comparative Examples.

Each sample for evaluation was 900 mm in width and 300 mm in length, and the length of the edge slope of each sample was 2400 mm, and three samples were prepared for each of the Examples and Comparative Examples, and edge sealing was evaluated at a total of 7.2 m. .

The pre-bonding process was carried out by degassing at 20° C. for 5 minutes using a vacuum ring, and then maintaining at different temperatures for 15 minutes at different temperatures of 70° C., 85° C., and 100° C., respectively.

Preparation of sample for evaluation 2) After cutting a 2.1 T-thick flat glass into 900 mm in width and 300 mm in length, aging was performed by leaving it for 60 days at 25°C and 40rh%. Using the aging-completed flat glass, an evaluation sample was prepared in the same manner as in Preparation 1) of the evaluation sample, but the holding temperature after deaeration was set to 85°C.

Evaluate the degree of edge sealing) Visually evaluate the sample for evaluation, and 5 points for the case where the edge sealing is perfect and no pattern is visible, 4 points for the case where the edge sealing degree is good and a weak pattern is visually confirmed, and the edge sealing degree is 3 points for normal and visually confirmed patterns, 2 points for poor edge sealing and 2 visually confirmed patterns, and 1 point for poor edge sealing and strongly visually confirmed patterns. And the total score of the three samples is shown in Table 2.

The physical property evaluation results are shown in Table 2 below.

Bubble generation evaluation

The samples for evaluation of Examples and Comparative Examples in which the preliminary bonding was completed were pressed in an autoclave at 140° C. and 1.2 MPa for 20 minutes to obtain a laminated glass in which the main bonding was completed. The total time required for the main bonding, including the heating time and the heating time, was 90 minutes.

The number of bubbles generated in the laminated glass on which the main bonding was completed was visually confirmed. If the sum of the number of bubbles identified in the three samples for each Example and Comparative Example is 5 or less, it is evaluated as 5 points, 6 to 10, 4 points, 11 to 15, 3 points, and 16 or more, 1 point. It is shown in 2.

Roller used Wedge angle (°) Surface roughness measurement result Sz(㎛) A1 A2 A2/A1 Comparative Example 1 ROLL 0 0.014 50.8 0.226 0.63 2.79 Example 1 ROLL 1 0.014 48.9 0.70 0.34 0.49 Example 2 ROLL 2 0.014 48.6 0.86 0.29 0.34 Example 3 ROLL 3 0.014 48.2 1.46 0.09 0.06

Glass type Edge sealing evaluation Bubble generation evaluation Pre-junction temperature Pre-junction evaluation score Bubble occurrence evaluation score Comparative Example 1 General glass 100℃ 14 5 85℃ 8 3 70℃ 4 One Aging glass 85℃ 4 One Example 1 General glass 100℃ 14 5 85℃ 13 4 70℃ 12 4 Aging glass 85℃ 12 4 Example 2 General glass 100℃ 14 5 85℃ 12 4 70℃ 10 3 Aging glass 85℃ 12 3 Example 3 General glass 100℃ 15 5 85℃ 13 5 70℃ 12 4 Aging glass 85℃ 12 4

Referring to Tables 1 and 2, the wedge angles of the evaluation film samples prepared according to Examples and Comparative Examples were all evaluated equal to 0.014°.

The Sz value of Examples 1 to 3, in which fine patterns were additionally processed by grit blasting and grinding treatment on the roller surface, was only a maximum of 2.6 um compared to the Sz value of Comparative Example 1. It can be seen that the value of the surface roughness Sz does not change significantly even after additional processing. On the other hand, in the case of Examples 1 to 3 in which the fine pattern additional processing was performed, the A2/A1 value was measured to be less than 1, whereas in the case of Comparative Example 1 without the fine pattern additional processing, the A2/A1 value was measured as 2.79, which is quite large. Showed a difference.

Referring to Table 2, in the case of the example in the edge sealing evaluation, a score of 10 or more was obtained under all conditions, whereas in the case of Comparative Example 1, the sample pre-bonded at 85°C and 70°C in the general glass and the aging glass at 85°C. Considering that a score of 8 or less was obtained in the pre-bonded sample, it can be seen that the edge sealing property of the film is improved when additional processing of a fine pattern is performed on the film.

In addition, in the case of the bubble generation evaluation, in the case of the Example, 3 points or more were obtained under all conditions, whereas in the case of Comparative Example 1, the score obtained when pre-bonding at 70°C in general glass and 85°C in aging glass was 1 As a matter of fact, it can be seen that the degassing stability of the film is improved when the micropattern is further processed on the film.

Although the preferred embodiments of the present specification have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention defined in the following claims are also present. It belongs to the scope of rights of

100: bonding film
500, 500': emboss roller
10, 11: bonding layer
20: sound insulation layer
A: thickness increase area

Claims (14)

Includes an embossed side,
The A2/A1 value of the embossed side is 1 or less,
Including an area of increasing thickness,
The thickness increasing region has both ends of one end and the other end,
The both ends are different in thickness, bonding film.
The method of claim 1,
The wedge angle (θ) is expressed by Equation 1 below,
A wedge angle in the thickness increase region of 0.01 to 0.04°, a bonding film;
[Equation 1]

In Equation 1 above,
The Hb is the thickness of the thicker side of the both ends of the thickness increase region,
Ha is the thickness of the thinner side of the both ends of the thickness increase region,
The w is a width length connecting both ends of the thickness increasing region.
The method of claim 2,
The ratio of the Ha to the w is 0.0002 or more and 0.0015 or less for bonding film.
The method of claim 1,
The thickness increase region is located on a part or all of the bonding film, the bonding film.
The method of claim 1,
The Sz value of the embossed surface is 30 um or more and 90 um or less, a bonding film.
The method of claim 2,
The Sz value of the embossed surface is 40 um or more and 80 um or less.
The method of claim 1,
The A1 value is 0.5 or more, the bonding film.
The method of claim 1,
The film for bonding, wherein the A2 value is 0.6 or less.
The method of claim 1,
It is a single layer film of one layer or a laminated film of two or more layers,
A film for bonding containing a polyvinyl acetal resin.
The method of claim 1,
A bonding film comprising a sound insulation layer.
A first light-transmitting layer;
A bonding film positioned on one surface of the first light-transmitting layer; And
A second light-transmitting layer positioned on the bonding film;
Including,
The bonding film includes a side on which an emboss is formed,
The A2/A1 value of the embossed side is 1 or less,
The bonding film includes a thickness increase area,
The thickness increasing region has both ends of one end and the other end,
The both ends have different thicknesses, the light-transmitting laminate.
The method of claim 11,
A light-transmitting laminate in which the total number of bubbles generated in three light-transmitting laminates having a horizontal length of 900 mm and a vertical length of 300 mm is 5 or less.
The method of claim 12,
Any one selected from the group consisting of the first transmission layer, the second transmission layer, and a combination thereof is an aged glass, a light-transmitting laminate
Moving means comprising the light-transmitting laminate according to claim 11 as a windshield.

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