KR102317548B1 - Film for bonding and light transmitting layered product comprising of the same - Google Patents

Abstract

Embodiments relate to a bonding film, a light-transmitting laminate including the same, and the like, including a bonding film including an embossed side, and having an A2/A1 value of 1 or less on the embossed side. The bonding film and the like control the characteristics of the embossed surface to improve degassing stability and edge sealing characteristics when forming a light-transmitting laminate.

Description

Film for bonding and light-transmitting laminate including the same

Embodiments relate to a bonding film, a light-transmitting laminate including the same, and the like.

Polyvinyl acetal is used as an intermediate layer (film for laminated glass) of laminated glass (safety glass) or light-transmitting laminate. Laminated glass is mainly used for windows of buildings, exterior materials, and automobile window glass, etc. It is possible to secure stability to minimize damage or injury.

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

The bonding film prevents blocking of interlayers on its surface, improves handling workability when overlapping a glass plate and an intermediate layer (slip property with a glass plate), and improves degassing stability (de-airing) during bonding processing with a glass plate A number of fine embossing are formed for this purpose.

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

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

The object of the embodiment is to improve degassing stability (De-Airing), edge sealing (Edge sealing) characteristics, etc., and to suppress a double phase in a head up display (Head Up Display) bonding film, light transmission laminate comprising the same body, etc.

In order to achieve the above object, the bonding film according to an embodiment disclosed herein includes an embossed surface, and the A2/A1 value of the embossed surface is 1 or less.

The bonding film includes a thickness increase region.

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

In the bonding film, the wedge angle θ is expressed 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 one of the both ends of the thickness increasing region,

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

Wherein w is a width length connecting the both ends of the thickness increase region.

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

In the bonding film, the thickness increase region may be located in 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 polyvinyl acetal resin.

The bonding film may include a sound insulating layer.

The light transmitting laminate according to another embodiment includes a first light transmitting layer, a bonding film located on one surface of the first light transmitting layer, and a second light transmitting layer located 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 region.

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

The light-transmitting laminate may have a horizontal length of 900 mm and a sum of the number of bubbles generated in three light-transmitting laminates having a vertical length of 300 mm of 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 aged glass.

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

The bonding film of this embodiment, the light transmitting laminate including the same, etc. control the characteristics of the embossed surface to improve degassing stability and edge sealing properties when forming the light transmitting laminate, and to prevent the occurrence of double images in laminated glass The film for bonding which can suppress, etc. can be provided.

1 and 2 are cross-sectional views schematically showing a bonding film according to an embodiment, respectively.
3 is a cross-sectional view schematically illustrating bonding films including sound insulating layers according to different embodiments in a), b), and c);
Figure 4 is a conceptual diagram illustrating an embossing 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 embossing in the manufacturing process of the bonding film manufactured in one embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art to which the present invention pertains can easily carry out the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. Throughout the specification, like reference numerals are assigned to similar parts.

As used herein, the terms "about," "substantially," and the like are used in a sense at or close to the numerical value when the manufacturing and material tolerances inherent in the stated meaning are presented, and to aid understanding of embodiments. It is used to prevent an unconscionable infringer from using the mentioned disclosure in an unreasonable manner.

Throughout this specification, the term "combination of these" included in the expression of the Markush form means one or more mixtures or combinations selected from the group consisting of the components described in the expression of the Markush form, and the components It is meant to include one or more selected from the group consisting of.

Throughout this specification, reference to “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 this specification, the meaning that B is located on A means that B is located on A or B is located on A while another layer is located in between, and B is located in contact with the surface of A. It is not construed as being limited to

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

In this specification, the size of each component in the drawings may be exaggerated for the description of the invention, and may be different from the size actually applied.

Evaluation of the amount of hydroxyl groups in this specification measured and evaluated the amount of ethylene groups to which the hydroxyl group of the said polyvinyl acetal resin couple|bonded with the method based on JISK6728.

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

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

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 representing the surface characteristics of an object.

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

A2 (valley cross-sectional area) means the area of a triangle in which the Smr2 value to 100% is the base and the Svk value is the height in the solid ratio curve graph.

An equivalent straight line is applied to the substantial ratio curve. The equivalent straight line is a straight line that includes 40% of the measurement points of the curve, and the slope is the minimum when connecting both end points of the section by arbitrarily setting a section of 40% of the entire section of the areal material ratio in the curve means a straight line. Values representing surface properties such as Sk, Smr1, Smr2, Spk, and Svk values may be derived through the equivalent straight line.

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

In a substance ratio curve, an equivalent straight line intersects an axis at 0% substance ratio (Y-axis) and an axis at 100% substance ratio (an axis parallel to the Y-axis), and the two intersecting points are parallel to the X-axis, respectively. line can be set. A line parallel to the X-axis including the intersection point of the equivalent straight line and the axis (Y-axis) at a substantial ratio of 0% is L1, and the intersection point of the equivalent straight line and the axis (an axis parallel to the Y-axis) at a substantial ratio of 100% and a line parallel to the X-axis is referred to as L2, the Sk value means the vertical distance between L1 and L2.

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

The Smr2 (Valley material portion, %) value is a value evaluated according to ISO_25178, and means an actual ratio of the intersection 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 measurement point corresponding to 0% of the actual ratio in the substantial ratio curve and the height of the equivalent straight line at 0% of the actual 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 substance ratio in the substance ratio curve and the height of the equivalent straight line at 100% of the substance ratio. do.

The bonding film can be bonded to a light transmitting body such as a glass plate to form a light transmitting laminate. A head-up display may be provided to a user (driver) by projecting an image on the light-transmitting laminate. However, the image projected on the light-transmitting laminate may form a double image while transmitting or reflecting the light-transmitting material such as glass and the bonding film, respectively, which is perceived as a ghost image by the user or lowers the sharpness of the image. . In order to suppress this phenomenon, a bonding film in the form of Ÿ‡ paper is applied for a head-up display.

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

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

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

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

1 and 2 are cross-sectional views schematically showing a bonding film according to an embodiment, respectively, and FIG. 3 is a bonding film including a sound insulating layer according to another embodiment in (a), (b) and (c). It is a cross-sectional view schematically showing films. Hereinafter, the present 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 herein 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 region (A), and the thickness increase region (A) has both ends of one end and the other end, and both ends have different thicknesses.

The A1 and A2 values are evaluated according to ISO_25178.

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

The measurement of the 3D roughness 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 using a 3D laser measuring microscope, measure ^{5 times or more with an area of 340,000 um 2} or more in different locations, and the average of the values excluding the highest and lowest values is 3 It can be applied as a measure of dimensional roughness. 3D When using the laser measuring microscope stitching (STICHING) by using the function can be followed paste measuring the 3D intensity images of a position adjacent, this stitching function 3D roughness measure total 1,000,000 um ² or more areas of the use of It can be evaluated as the average of the values measured in

For example, it can be obtained by measuring 3D illuminance by VSI Mode (Vertical scanning Interferometry) using a non-contact three-dimensional illuminance meter (3D Optical Microscopy, model Contour GT) manufactured by 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. Also, the A2/A1 value of the embossed surface may be 0.02 or more. 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 may be improved while substantially maintaining the degassing stability equal to or more. In addition, when the A2 / A1 value of the embossed surface is within the above-mentioned range, the bulk density of the upper and lower portions of the embossed surface is appropriately adjusted to improve edge sealing properties even at relatively low temperatures without substantially changing the roughness. can do it

The A1 value of the embossed surface of the bonding film 100 may be 0.5 or more. The A1 value may be 0.6 or more. Also, 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 convex portion (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 properties.

The A2 value of the embossed surface of 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 0.6 or less, the pore volume of the valley of the surface pattern of the bonding film is small, so the amount of air to be degassed can be adjusted to an appropriate level or less, and degassing stability can be improved. have.

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

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

The thickness increase area 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 region A. The thickness may increase at a rate that gradually increases as a whole in the thickness increase region A. The increase in the thickness may increase at a rate that gradually decreases as a whole in the thickness increase region A.

The thickness of the thickness increase region A may decrease from one end toward the other end. The thickness may be reduced at a constant rate as a whole in the thickness increase region A. The thickness may decrease at a rate that gradually increases as a whole in the thickness increase region A. The increase in the thickness may decrease at a rate that gradually decreases as a whole in the thickness increase region A.

By varying the thickness of the both ends in the thickness increase area (A), the path of transmitted light or the angle of reflected light is adjusted to form a double image when irradiating light from the light source of the head-up display system toward the light-transmitting laminate you can avoid doing 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 one of the both ends of the thickness increase region (A),

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

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

The Hb value and the Ha value may be measured using a Mitsutoyo 547-401 thickness gauge for the central thickness and the average thickness, but is 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. The bonding film having such a wedge angle can effectively suppress the formation of a double image when used as an interlayer for a head-up display.

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

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

A specific method of measuring 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 w to Hb may be 0.001 or more and 0.002 or less. In addition, the ratio of w to Hb may be 0.001 or more and 0.0018 or less. When the ratio of Hb to w is within the above range, it is possible to provide a bonding film having excellent impact resistance and penetration resistance, and having a double phase 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 within the above range, it is possible to provide a bonding film having both penetration resistance and double phase prevention function.

The thickness increase region (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 increase regions (A).

The bonding film 100 may have an Sz value of 30 um or more and 90 um or less of the embossed surface.

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

The Sz value may be measured and calculated using a three-dimensional illuminance meter. For example, a non-contact three-dimensional illuminance meter (3D Optical Microscopy, model Contour GT) of Bruker is used in VSI Mode ( It can be obtained by measuring 3D illuminance with vertical scanning interferometry.

The bonding film 100 may have an Sz value of 30 um or more and 90 um or less of the embossed surface. 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 characteristic can have a sufficient degassing characteristic with a height distribution of surface irregularities.

The bonding film having the Sz value of the surface on which the empo is formed has the above-described value and the A2/A1 value described above has excellent degassing stability even when pre-bonding is applied at a low temperature and at the same time improves edge sealing properties can do it

The bonding film 100 may be a single-layer film or a multi-layer 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 include 60 wt% or more and 76 wt% or less of polyvinyl acetal resin, 70 wt% or more and 76 wt% or less, and 71 wt% or more and 74 wt% or more. It may include the following. When the polyvinyl acetal resin is included in this range, it is possible to impart relatively high tensile strength and modulus to the laminated film for bonding.

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

When the polyvinyl acetal resin having such properties is applied to the bonding film, it may have excellent mechanical properties such as penetration resistance while excellent bonding to a substrate such as glass.

The polyvinyl acetal resin may be a polyvinyl acetal resin obtained by acetalizing polyvinyl alcohol having a polymerization degree of 1,600 or more and 3,000 or less with aldehyde, and polyvinyl acetal obtained by acetalizing polyvinyl alcohol having a polymerization degree of 1,700 or more and 2,500 or less with aldehyde. It may 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 a synthesis of polyvinyl alcohol and an 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. In the case of applying n-butyl aldehyde 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 include 24 wt% or more and 40 wt% or less of the plasticizer, 24 wt% or more and 30 wt% or less, and 26 wt% or more and 29 wt% or less. . When the plasticizer is included in this range, it is good in that it can impart appropriate bonding strength and impact resistance to the laminated film for bonding.

Specifically, the plasticizer is triethylene glycol bis 2-ethylhexanoate (3G8), tetraethylene glycol diheptanoate (4G7), triethylene glycol bis 2-ethylbutyrate (3GH), triethylene glycol bis 2-hep group consisting of thanoate (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, consisting of triethylene glycol di-2-ethyl butyrate, triethylene glycol di-2-ethylhexanoate, triethylene glycol di-n-heptanoate, and combinations thereof. It may include any one selected from the group, and more specifically, triethylene glycol bis 2-ethylhexanoate (3G8) may be applied.

The bonding film 100 may further include an additive as needed, for example, the additive is an antioxidant, a heat stabilizer, a UV absorber, a UV stabilizer, an IR absorber, a glass bonding strength regulator, and combinations thereof. It may be any one selected.

The antioxidant may be a hindered amine-based or hindered phenol-based antioxidant. Specifically, in the polyvinyl butyral (PVB) manufacturing process that requires a process temperature of 150° C. or higher, a hindered phenol-based antioxidant is more preferable. The hindered phenol-based antioxidant may be, for example, IRGANOX 1076 or 1010 manufactured by BASF.

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

As the UV absorber, Chemisorb 12, Chemisorb 79, Chemisorb 74, Chemisolv 102, BASF Tinuvin 328, Tinuvin 329, Tinuvin 326, etc. from Chemipro Chemicals may be used as the UV absorber. As the UV stabilizer, BASF's Tinuvin may be used. ITO, ATO, AZO, etc. may be used as the IR absorber, and the glass bonding strength regulator may use metal salts such as Mg, K, Na, epoxy-modified Si oil, or a mixture thereof, 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, or a laminate of five or more layers. The multilayer film may include bonding layers 10 and 11 in direct contact with the 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, for example, may have functionality such as a heat shielding functional layer.

The multilayer film may include a polyvinyl acetal resin corresponding to the composition of the single-layer film described above 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 overlaps with the description above, the description thereof will be omitted.

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

The sound insulating layer 20 may include polyvinyl acetal resin.

The sound insulating layer 20 may include 54 wt% or more and 76 wt% or less of polyvinyl acetal resin, and may include 60 wt% or more and 70 wt% or less.

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

The polyvinyl acetal resin included in the sound insulating 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, more stable sound insulation properties may be imparted to the bonding film.

The bonding film 100 may be manufactured in a sheet shape by extruding a composition for manufacturing a bonding film including a resin, a plasticizer, and, if necessary, an additive, and molding the bonding film 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 sheet shape 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 above-described characteristics of the embossed surface and the characteristics of the thickness increase region (A) at the same time, it has a double-image prevention function along with surface bonding characteristics.

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 is rapidly changed occurs, and in this portion, a light transmitting body such as a glass plate and When fitted, air bubbles can easily occur. However, the bonding film having the characteristics of the embodiment, the bubble generation is controlled as a whole for the bonding film including such a bent portion, and can provide a bonding film having excellent optical properties and excellent double-image prevention functionality at the same time.

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

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

The surface characteristic of the embossing roller 500 is transferred to the surface of a single-layer film or a multi-layer film by applying a heating and pressing method applied to the bonding film 100 in general, and in this case, the transfer rate may be 0.6 or more, and may be 0.7 or more. 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 embossing is 1.

Since the surface characteristics of the embossing roller 500 are complementary to the film surface, the surface characteristics of the embossing roller can be controlled to control the characteristics of the surface on which the film embossing is formed.

The embossing roller 500 is a grit blasting process on the concave part of the basic roller (applied to Comparative Example 1) as shown in FIG. 3, and grinding on the convex part by a method such as can be manufactured. At this time, the surface properties can be controlled by adjusting the conditions (particle size, spraying pressure, spraying distance, spraying angle, etc.) applied during the grit blasting treatment and the conditions applied during the grinding treatment (grinding degree), which are complementary This is reflected in the embossing properties of the film surface.

Illustratively, particles with an average outer diameter of 3 um or more and 8 um or less are added to the concave portion of the basic roller having an Rz roughness value of 30 um or more and 90 um or less, having irregularities in the form of a matte pattern of 40 cm or more and 45 cm or less. Direct pressure spraying with a spray pressure of 0.3 MPa or more and 0.5 MPa or less at a distance of A fine pattern may be formed on the convex portion of the film surface through grit blasting of the concave portion to relatively increase the volume A1 of the convex portion on the film surface.

In addition, it is possible to grind the convex part of the basic roller, and the grinding thickness may be applied to 1 μm or more and 5 μm or less. The grinding thickness may be applied to 1um or more and 3um or less. Through the grinding treatment of the convex portion, it is possible to narrow the voids between the concave portions on the surface of the film, and to further improve the degassing stability.

A light-transmitting laminate (not shown) according to another embodiment disclosed herein is a first light-transmitting layer (not shown), a bonding film 100 positioned on one surface of the first light-transmitting layer, and and 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.

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

The light-transmitting laminate may have a horizontal length of 900 mm and a sum of the number of bubbles generated in three light-transmitting laminates having a vertical length of 300 mm of 5 or less. A detailed description of the conditions and method for measuring the number of cells of the light-transmitting laminate overlaps with those of the following evaluation examples, and thus description thereof will be omitted.

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

In the case of general glass, as the flatness deteriorates due to the formation of scale on the surface over time under the influence of ambient temperature and humidity, edge sealing properties may be reduced. Specifically, the light-transmitting laminate is applied to the light-transmitting layer (the first light-transmitting layer or the second light-transmitting layer) by applying glass aged for a certain period at a specific temperature and a specific relative humidity to induce scale formation on the surface. It can be confirmed whether or not the bonding film has excellent edge sealing properties even under severe conditions.

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

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

The moving means according to another embodiment disclosed herein includes the above-described light-transmitting laminate. The moving means includes a body forming a body of the moving means, a driving unit (engine, etc.) mounted on the body, a driving wheel (wheel, etc.) rotatably mounted on the body, and connecting the driving wheel and the driving unit. connecting device; and a windshield, which is a light-transmitting laminate that is mounted on a part of the body and blocks 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 weight% or mole% with respect to the % base, the unit means weight%.

Manufacturing Example: Roller Machining

An additional fine pattern was formed on the concave portion of the steel roller having an embossed shape, which is a matte pattern in which dots were randomly formed, and grinding treatment was performed on the convex portion.

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 manufacture ROLL 1, ROLL 2, and ROLL 3, respectively. Specifically, a concave portion (valley) of the mat pattern was subjected to grit blasting, and a convex portion (peak) of the mat pattern was subjected to grinding treatment. For grit blasting, particles with an average outer diameter of 5 μm were sprayed directly through a 200 mesh foreign material removal filter at a distance of 40 cm or more and 45 cm or less at a spray pressure of 0.4 MPa. The angle between the mold surface and the injection particle (or nozzle) was 85° or more and 105° or less.

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

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

Preparation Example: Preparation of Film

Each component used in the following Examples and Comparative Examples is as follows.

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

Polyvinyl butyral resin (B) : PVA and n-BAL having a degree of polymerization of 2400 and a degree of saponification of 88 are added, and polyvinyl having 8.6 wt% of hydroxyl groups, 79.9 wt% of butyral groups, and 11.5 wt% of acetyl groups is carried out through the usual synthesis process. A butyral resin was obtained.

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 regulator were mixed and mixed so as to be sufficiently dispersed in a tumbler (total 0.33 parts by weight).

Examples 1 to 3: Into 72.67 wt% of polyvinyl butyral resin (A), 27 wt% of 3g8 as a plasticizer, and 0.33 wt% of additives were added to one twin-screw extruder (a), and polyvinyl butyral resin (B) 65wt% of 3g8 as a plasticizer 35wt% was put into another twin-screw extruder (b) and co-extruded. A film having a thickness of one end thicker than the thickness of the other end was prepared through T-DIE while molding in the form of (A) composition / (B) composition / (A) composition through the feed block. Before winding, as shown in Table 1 below, different rollers (ROLL 1, ROLL 2, ROLL 3) were applied to the upper and lower parts, and the film on which the surface pattern was transferred through separate embossing was sampled in the form of a roll sample and each 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 angle of both sides of the embossing roll was adjusted to 0.014° to proceed with the transfer.

Comparative Example 1: A film of Comparative Example 1 was prepared in the same manner as in Examples 1 to 3 above, except that the embossing treatment was performed using a roller (ROLL 0) without additional processing of the upper and lower fine patterns.

Evaluation example: evaluation of physical properties

Wedge angle measurement

Since the thickness increase region of the film sample for evaluation 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 film sample for evaluation, the measured values of Ha, Hb, and w were substituted into Equation 1 below to obtain a wedge angle measurement value.

[Equation 1]

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

Measurement of surface roughness

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

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

The measurement results of 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 to have a width * length of 1000 * 1000 mm, aging was performed by leaving them at 20 ° C. and 20 rh (relative humidity)% for 2 days. Specimens were collected at 900 * 300 mm based on the central portion of the film in the width direction, and three specimens were cut in the longitudinal direction in the same manner.

The specimen was pre-bonded between two sheets of flat glass having a thickness of 2.1 T (T=mm) to prepare three evaluation samples for each Example and Comparative Example.

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

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

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

Edge sealing degree evaluation) By visually evaluating the sample for evaluation, 5 points were obtained when the edge sealing was perfect and no pattern was seen at all, 4 points when the edge sealing degree was good and a weak pattern was visually confirmed, and the edge sealing degree was The case where the pattern is normal and visually confirmed is 3 points, the case where the edge sealing degree is poor and the pattern is visually confirmed is 2 points, and the case where the edge sealing degree is bad and the pattern is strongly visually confirmed is evaluated as 1 point and the total score of the scores of the three samples is shown in Table 2.

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

bubble generation evaluation

The evaluation samples of Examples and Comparative Examples in which the pre-bonding was completed were compressed 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 main bonding, including the temperature rise time and temperature fall time, was 90 minutes.

The number of bubbles generated in the laminated glass on which the main bonding was completed was visually confirmed. In the case where the sum of the number of bubbles confirmed in the three samples according to Examples and Comparative Examples is 5 or less, 5 points, 6 to 10, 4 points, 11 to 15, 3 points, and 16 or more, 1 point. 2 is shown.

roller used Wedge angle (°) Surface roughness measurement result Sz (μm) 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-bonding temperature Pre-junction evaluation score Bubble Occurrence Rating 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 film samples for evaluation prepared in Examples and Comparative Examples were evaluated equally at 0.014°.

The Sz values of Examples 1 to 3, which were subjected to additional processing of fine patterns by grit blasting and grinding on the surface of the rollers, compared with the Sz values of Comparative Example 1, the difference value was only 2.6 μm, and the fine patterns on the surface of the rollers were only 2.6 μm. It can be seen that the value of the surface roughness Sz does not change significantly even with 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 Comparative Example 1 in which the fine pattern additional processing was not performed, the A2/A1 value was measured to be 2.79, which is quite large. made a difference

Referring to Table 2, in the edge sealing evaluation, in the case of Examples, scores of 10 or more were obtained under all conditions, whereas in Comparative Example 1, samples pre-bonded at 85°C and 70°C in general glass and 85°C in aging glass. 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 fine pattern additional processing is performed on the film.

In addition, in the bubble generation evaluation, in the case of Examples, 3 points or more were obtained under all conditions, whereas in Comparative Example 1, when pre-bonding at 70° C. in general glass and pre-bonding at 85° C. in aging glass, the score obtained was 1 It can be seen that the degassing stability of the film is improved when the fine pattern additional processing is performed on the film.

Although 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 as defined in the following claims are also present. is within the scope of the

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

Claims (14)

Including a surface on which the embossing is formed,
The A2/A1 value of the embossed surface is 1 or less,
The A1 value is 0.5 or more,
comprising a region of increased thickness;
The thickness increase region has both ends of one end and the other end,
The both ends have different thicknesses,
The A1 value and the A2 value are values evaluated according to ISO_25178, the bonding film.
According to claim 1,
The wedge angle (θ) is expressed by Equation 1 below,
The wedge angle in the thickness increase region is 0.01 to 0.04 °, the bonding film;
[Equation 1]

In Equation 1 above,
The Hb is the thickness of the thicker one of the both ends of the thickness increasing region,
Wherein Ha is the thickness of the thinner of the both ends of the thickness increase region,
Wherein w is a width length connecting the both ends of the thickness increase region.
3. The method of claim 2,
A bonding film in which the ratio of Ha to the w is 0.0002 or more and 0.0015 or less.
According to claim 1,
The thickness increase region is located in part or all of the bonding film, the bonding film.
According to claim 1,
The Sz value of the embossed surface is 30 um or more and 90 um or less, a bonding film.
3. The method of claim 2,
The Sz value of the embossed surface is 40 um or more and 80 um or less, a bonding film.
delete According to claim 1,
The said A2 value is 0.6 or less, The film for bonding.
According to claim 1,
It is a single-layer film of one layer or a laminated film of two or more layers,
A bonding film containing polyvinyl acetal resin.
According to claim 1,
A bonding film comprising a sound insulating 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 an embossed surface,
The A2/A1 value of the embossed surface is 1 or less,
The A1 value is 0.5 or more,
The bonding film includes a thickness increase region,
The thickness increase region has both ends of one end and the other end,
The both ends have different thicknesses,
wherein the A1 value and the A2 value are values evaluated according to ISO_25178.
12. The method of claim 11,
The light-transmitting laminate, wherein the sum of the number of cells generated in the three light-transmitting laminates having a horizontal length of 900 mm and a vertical length of 300 mm is 5 or less.
13. The method of claim 12,
Any one selected from the group consisting of the first transmissive layer, the second transmissive layer, and a combination thereof is aged glass, the light transmissive laminate
A moving means comprising the light-transmitting laminate according to claim 11 as a windshield.

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