CN115087542A - Composite glass pane with improved heat insulation and antiglare tape - Google Patents

Composite glass pane with improved heat insulation and antiglare tape Download PDF

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Publication number
CN115087542A
CN115087542A CN202180004945.9A CN202180004945A CN115087542A CN 115087542 A CN115087542 A CN 115087542A CN 202180004945 A CN202180004945 A CN 202180004945A CN 115087542 A CN115087542 A CN 115087542A
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CN
China
Prior art keywords
antiglare
glass pane
tape
composite glass
region
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202180004945.9A
Other languages
Chinese (zh)
Inventor
S·吉尔
U·范德莫伊伦
A·威尔姆斯
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saint Gobain Glass France SAS
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Saint Gobain Glass France SAS
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Filing date
Publication date
Application filed by Saint Gobain Glass France SAS filed Critical Saint Gobain Glass France SAS
Publication of CN115087542A publication Critical patent/CN115087542A/en
Pending legal-status Critical Current

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    • B32B5/14—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by a layer differing constitutionally or physically in different parts, e.g. denser near its faces
    • B32B5/142—Variation across the area of the layer
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Joining Of Glass To Other Materials (AREA)

Abstract

The invention relates to a composite glass pane (100) having an antiglare tape (1), comprising an outer glass pane (2) and an inner glass pane (3) which are joined to one another by an intermediate layer (4), wherein the intermediate layer (4) comprises a thermoplastic film (10) made of a thermoplastic polymer, which has a colored antiglare region (5) for forming the antiglare tape (1), and heat-shielding particles (6) are additionally dispersed only in the colored antiglare region (5) of the film (10). The invention also comprises a method for manufacturing such a composite glass pane (100) with an antiglare tape (1) and its use in a vehicle, in particular as a windscreen pane, preferably as a panoramic glass pane.

Description

Composite glass pane with improved heat insulation and antiglare tape
The invention relates to a composite glass pane with an antiglare tape having an improved thermal insulation function, a method for the production thereof and the use of such a composite glass pane.
In the automotive field, in particular for the production of windscreens, films are frequently used which have a so-called colored band as an antiglare in the upper region. For this purpose, for example, the upper part of the film can be coextruded, for example, with a correspondingly colored polymer melt. In the production of transparent films which are colored in subregions, for example as intermediate films for motor vehicle safety glass, transition regions which have a continuous transition in color intensity from the colorless to the colored regions and are precisely defined and dimensioned are required. This is achieved, for example, by means of a coloured strip having a wedge-shaped course at the end of the coloured strip. Methods for making films with colored bands suitable for use in the vehicle art are available in the prior art and are described, for example, in US3715420, US3799718 and US 4562023.
There is an increasing need for composite glass panels, particularly vehicle panels, that have or are capable of performing other functions in addition to antiglare by colored bands. This includes, for example, improved sound insulation which can be achieved by so-called acoustic membranes in composite glazing, the suitability for HUD (head-up display) functions, for example, provided by the use of wedge-shaped membranes, and improved thermal insulation functions for increasing the thermal comfort in the vehicle interior. JP 2002326846 a and EP 1227070B 1 describe polyvinyl butyral films (PVB films) in which heat shielding particles are distributed throughout the volume of the film to provide a thermal insulating function. For this purpose, for example, nanoscale semiconductor particles, for example ITO or ATO, are distributed as uniformly as possible throughout the volume of the film during the production of the film. Disadvantages here are on the one hand the high cost of the particles and the difficulty of preventing the nanoparticles from aggregating during extrusion so that this does not lead to unacceptable haze.
Panoramic glass panels, particularly those that extend toward the top as compared to conventional standard windshield panels and allow the vehicle occupants an increased field of view, are becoming increasingly popular in vehicle manufacturing. Such panoramic glass sheets are designed to be relatively large due to the enlarged glass sheet area and field of view area. Vehicles with panoramic glass panels also typically have a darkly tinted roof glass panel which is now mounted in close proximity to the panoramic windshield panel. In order to create an attractive aesthetic overall impression, it is desirable to match the colored band color of the panoramic glass pane in the adjacent area with the generally deep to very deep color of the top glass pane. Colored tapes used to provide antiglare are often designed to be wider in panoramic glass sheets than conventional windshield sheets, e.g., >20 cm. Nevertheless, such panoramic glass panels must also meet the stringent requirements of motor vehicle safety glass, for example transparency in the central vision of the driver. The windscreen panel has a central field of view, which puts very high demands on its optical quality. The central field of view must have a high light transmission (typically greater than 70%). Films with enlarged colored bands suitable for use in the manufacture of such panoramic windshields are commercially available and are manufactured, for example, by ‎ Sekisui Chemical co. It is also desirable for panoramic windscreen panels to be combined with other functions, but in particular to provide a satisfactory improved thermal insulation function while maintaining quality and meeting all other stringent requirements in vehicle construction, in particular for windscreen panels which are expensive to manufacture due to the size of such panoramic glass panels, and in particular also complicated in combination with other required functions.
EP 2465833 a1 and JP 2008001535 a disclose vehicle glazing comprising a band-pass filter, wherein the band-pass filter contains infrared shielding particles.
The object of the present invention is to provide a composite glass pane with an antiglare tape with improved thermal insulation, which can be produced simply and more cost-effectively, in particular when designed as a panoramic windscreen pane. Furthermore, in addition to improved thermal comfort, the composite glass pane should also be able to be designed to be combined with other functions in a simple manner without complex adjustments in manufacture.
According to the present invention, this and other objects are achieved by a composite glass sheet according to independent claim 1. Advantageous embodiments of the invention result from the dependent claims.
According to the present invention, there is proposed a composite glass pane with an antiglare tape comprising an outer glass pane and an inner glass pane joined to each other by an interlayer, wherein the interlayer comprises a film made of a thermoplastic polymer, the film having a colored antiglare region for forming the antiglare tape, and heat-shielding particles additionally dispersed only in the colored antiglare region of the film. According to the invention, the antiglare region of the film comprises a volume of thermoplastic film made and designed to be colored in order to form an antiglare tape within the thermoplastic film. In a plan view of the composite glass pane, the antiglare region has the geometric dimensions of the antiglare tape here. According to the invention, it is provided that the heat-shielding particles are distributed only in the colored volume of the thermoplastic film which is used to form the intermediate layer in the composite glass pane, and that other parts of the film which are not colored for antiglare purposes remain free of the heat-shielding particles additionally introduced according to the invention. Advantageously, by introducing heat-shielding particles only into the antiglare region, in particular in the case of panoramic glass panes, it is possible to significantly improve the heat shielding and to provide satisfactory thermal comfort with a significantly reduced production cost of the composite glass pane.
Heat shielding particles are understood to mean nanoscale transparent particles having heat reflecting or heat absorbing properties. The introduction of particles only into the antiglare region, for example a coloured polymer melt for coextrusion, requires adjustment in the manufacturing process of the thermoplastic films already described and commercially produced in US3715420, USD3799718 and US4562023 and JP 2002326846 a and EP 1227070B 1. Advantageously, according to the invention, moreover, no clouding due to particle agglomeration occurs at all, in particular in the visible region, since this region is produced according to the invention free of additionally introduced heat-shielding particles. By this measure, the production costs can furthermore be significantly reduced according to the invention.
In one embodiment of the invention, provision is made for the heat-shielding particles to comprise at least one metal or metal oxideOr consisting of the same, in particular selected from Indium Tin Oxide (ITO), antimony-doped tin oxide (ATO), aluminium-doped zinc oxide (AZO), indium zinc mixed oxide (IZO), titanium dioxide (TiO) 2 ) Or tungstates, e.g. cesium tungstate Cs 2 WO 4 . ITO and ATO have favorable moisture stability.
In a further embodiment of the composite glass pane with antiglare tape according to the invention, the heat-shielding particles have an average particle diameter of from 5 nm to 200 nm, preferably <150 nm, particularly preferably <100 nm, for example <90 nm, <80 nm, <70 nm or < 50 nm. The small particle size offers the advantage here that they can be dissolved more easily and aggregate less strongly. The particle size distribution is preferably as uniform as possible, i.e. the particles used have as close to the same diameter as possible. Various methods for determining particle size are known to the person skilled in the art, such as Scanning Electron Microscopy (SEM) or Transmission Electron Microscopy (TEM).
Another embodiment of the invention provides that the antiglare region comprises from 0.1 to 20% by weight, preferably from 1 to 10% by weight, particularly preferably < 5% by weight, for example less than 3% by weight, of heat-shielding particles, based on the total mass of the colored thermoplastic polymer material used to form the antiglare region of the film. The particle content is suitably selected such that on the one hand a heat shielding function is fulfilled, but particle agglomeration and thus optionally undesirable clouding are prevented.
According to the invention, the thermoplastic intermediate layer can be formed from a single thermoplastic film, wherein the colored or colored antiglare region is produced by local coloring or dyeing. As already described, such films can be obtained, for example, by coextrusion. In a preferred embodiment, the thermoplastic intermediate layer is thus formed from a coextruded thermoplastic film which extends continuously from the antiglare region to the visible region and contains heat shielding particles only in the antiglare region. Alternatively, but less preferably according to the present invention, the colored film portion and the uncolored film portion for the antiglare region may be combined to form a thermoplastic layer. The antiglare region can be uniformly colored or tinted and therefore has a location-independent transmittance. However, the coloration or dyeing may also be inhomogeneous, in particular a transmittance distribution may be achieved.
In a preferred embodiment, it is provided that the antiglare region in the thermoplastic film is designed to have a wedge-shaped cross section. This means that at least the portion of the antiglare region facing downwards (towards the engine edge in a motor vehicle) has a continuously decreasing thickness in cross section. The transmission in the colored or colored region thereby increases at least in this end section with increasing distance from the upper edge (roof edge in a motor vehicle). Sharp edges of the colored regions can thereby be avoided, so that the transition of the antiglare band of a composite glass pane, for example a windscreen pane according to the invention, to the clear transparent region is gradual, which appears more aesthetically appealing. The antiglare region is particularly preferably provided with a thermoplastic film having a wedge-shaped cross section, wherein in the mounted state of the composite glazing panel as a motor vehicle windshield panel the film thickness in the antiglare region decreases from the top edge in the direction towards the engine edge, while the thickness of the thermoplastic film outside the antiglare region is constant. This is advantageous for achieving a wedge-angle profile only locally in the antiglare region. Such thermoplastic films may optionally consist of a wedge-angled film in the antiglare region and a film of constant thickness in the remaining region, or be made as a continuously coextruded film having a wedge-angled course in the antiglare region and a constant thickness in the remaining region. Although such coextruded films are relatively complex to manufacture, there is a particularly uniform transition between the antiglare region and the visible region of the composite glass sheet without visible edges.
According to the invention, in a preferred embodiment, the thermoplastic film is designed as a thermoplastic polymer film comprising polyvinyl butyral (PVB), Ethylene Vinyl Acetate (EVA) or polyurethane and/or mixtures and/or copolymers thereof. Polyvinyl butyral is particularly preferred. The thermoplastic film is preferably designed based on the mentioned materials, but may contain other ingredients, such as plasticizers. The polymer films of the type mentioned are particularly well suited for use in the vehicle sector and are readily available or can be easily produced in a similar manner by the methods already established according to embodiments of the invention with heat-absorbing particles in the colored antiglare region.
According to an embodiment of the composite glass pane according to the invention, it is provided that the antiglare region has a width of >30 cm, for example 45 cm or 50 cm. According to the invention, the width in this case refers to the dimension of the antiglare region starting from the top edge of the windshield plate towards the edge of the engine. Due to the relatively wide glare shield region which is desirable in particular in the case of panoramic glass panes, a significant improvement in the thermal comfort can thus be achieved by the heat shielding particles distributed in the glare shield region.
In one embodiment according to the present invention, a composite glass sheet with an antiglare tape is designed to include a thermoplastic film having a wedge-shaped thickness profile. The composite glass pane according to the invention therefore has a wedge-shaped thickness profile overall and can be used advantageously in a heavy-duty motor vehicle windscreen for a head-up display (HUD). The fundamental problem with HUDs is that the projector image is reflected on both surfaces of the windshield. Thus, the driver can perceive not only the desired primary image but also a slightly offset secondary image, which is generally weak in intensity. The latter is also commonly referred to as ghost images. This problem is solved according to the invention by wedge-shaped production of the thermoplastic film such that the reflecting surfaces are arranged at a correspondingly selected angle to each other, so that the main image and the ghost image overlap, whereby the ghost image appears to be no longer disturbing. In conventional composite glasses for head-up displays, the wedge angle is typically about 0.5 mrad. In addition to improving thermal comfort, HUD functions can thus be provided in combination.
In another embodiment of the composite glass sheet with antiglare tape according to the present invention, the thermoplastic film is an acoustic thermoplastic film, such as an acoustic PVB film. This is understood to mean a film that provides a noise-reducing, sound-insulating effect. This effect can be achieved, for example, by a film having a plurality of sublayers, for example three sublayers, wherein the inner sublayer of the thermoplastic film has a higher plasticity and/or elasticity than the outer sublayer surrounding it. This can be achieved, for example, by the inner part-layer containing a higher proportion of plasticizer. In other words, the composite glass pane according to this embodiment of the invention not only has an antiglare effect in the antiglare region and improved thermal insulation due to heat shielding particles, but also advantageously combines these functions with sound insulation.
The individual polymer films, in particular PVB films, preferably have a thickness of about 0.2 mm to 1 mm, for example 0.38 mm, 0.76 mm or 0.81 mm. Other properties of the composite glass sheet can be affected by the thickness of these films. For example, a thicker PVB film provides improved sound insulation, particularly when it contains an acoustically effective core, as described above, but also provides improved theft protection and improved protection from ultraviolet radiation (UV protection).
In another preferred embodiment, the TTS value in the antiglare tape of the composite glass sheet is < 35%, calculated according to ISO 13837 convention a. The TTS value is a measure of the total transmitted thermal radiation of the sun through the glass sheet in the area of the antiglare zone according to the invention.
The present invention also includes a method for manufacturing a composite glass sheet with an antiglare tape comprising the steps of:
s1: providing a thermoplastic film having a colored antiglare region in which heat shielding particles are dispersed;
s2: disposing a thermoplastic film between an outer glass sheet and an inner glass sheet in a stacked sequence;
s3: the stacking sequence is bonded under heat, vacuum and/or pressure into composite glass sheets.
In one embodiment of the method according to the present invention, a thermoplastic film is provided in step S1, for example by co-extruding a first polymeric material for forming the film and a second colored polymeric material for forming a colored antiglare region within the film, wherein heat absorbing particles are dispersed only in the volume of the colored polymeric material of the antiglare region.
The composite glass pane is provided for separating an interior space, in particular of a vehicle, from an external environment in a window opening. The composite glass pane is a laminate and comprises a first and a second glass pane, which are referred to as outer glass pane and inner glass pane in the sense of the present invention and are joined to one another by means of a thermoplastic interlayer. An inner glass pane means, in the sense of the present invention, a glass pane which, in the mounted position, faces the interior space. The outer glass pane is the glass pane facing the outside environment in the installed position. In the sense of the present invention, a surface (or inner side or inner surface) on the side of the interior space is understood to mean the surface of the glass pane facing the interior space in the mounted position. In the sense of the present invention, an outer side surface (or outer side or outer surface) is understood to mean the surface of the glass pane which, in the mounted position, faces the external environment.
The surface of the glass sheet is commonly referred to as follows: the outer side of the outer glass plate is called the I-side. The inner side of the outer glass plate is called side II. The outer side of the inner glass plate is called the III-side. The inner side of the inner glass plate is called the IV side.
The outer and inner glass plates are preferably formed independently of one another from glass or plastic, preferably soda lime glass, alkali aluminosilicate glass, float glass, polycarbonate or polymethyl methacrylate. In a particularly preferred embodiment, the outer glass pane and the inner glass pane are made of glass.
Suitable glass plates include those known under the trade names Planeclear and Planilux (clear glass, respectively) or TSANx, TSA3+, TSA4+ from Saint-Gobain, where the glass of the TSA series is green-tinted glass.
The outer glass pane and/or the inner glass pane, independently of one another, preferably have a thickness of 0.1 mm to 4 mm, preferably 1 mm to 4 mm, particularly preferably 1.6 mm to about 2.1 mm.
The surface on the inner space side of the outer glass sheet and the outer side surface of the inner glass sheet face each other and are bonded to each other through a thermoplastic interlayer. According to the invention, the intermediate layer comprises or is formed from at least one film made of a thermoplastic polymer, which film has a colored antiglare region for forming an antiglare zone and additionally has heat-shielding particles dispersed only in the colored antiglare region of the film.
In one embodiment of the method according to the invention, it is provided that the colored antiglare region is designed in step 1 with a wedge-shaped cross section. Advantageously, a continuous transition from the antiglare tape to the colorless region of the composite glass pane can thereby be achieved visually. According to the invention, the method further comprises the following steps: the antiglare region can also be designed here as a subregion of the same thickness in cross section also towards the edge of the composite glass pane, for example towards the top edge of the windshield pane, and can be designed to be wedge-shaped in the antiglare belt end only towards the opposite engine edge, in order to provide a continuous transition of the composite glass pane in terms of color into the visible region. In particular, it is also possible to design in the case of panoramic glass panes so that they can have a relatively wide antiglare band.
In a further embodiment of the method for producing a composite glass pane according to the invention, it is provided that the thermoplastic film is designed in step 1 to have a surface structure with a roughness Rz of 15 μm to 70 μm, preferably 25 μm to 50 μm. Roughness Rz is also referred to as roughness depth, where R z Is the individual roughness depth R of successive individual measuring sections zi The arithmetic mean of (a):
Figure DEST_PATH_IMAGE001
individual roughness depth R zi Is the sum of the height of the maximum profile peak and the depth of the maximum profile valley of the roughness profile within an individual measurement segment. The measurement of roughness is known to the person skilled in the art and is carried out in accordance with DIN EN ISO 4287: 2010-07 and DIN EN ISO 4288: 199804.
This may be done, for example, by embossing the film. One possibility here is to imprint a single-sided or double-sided surface structure with a corresponding roughness on the film, for example between a roller pair, wherein the film is preferably heated during or before passing through the roller pair. By means of the surface structure of the film produced in this embodiment of the method, channels are formed which advantageously contribute to a reliable degassing of the pre-composite body with the outer glass pane and the inner glass pane when a negative pressure is applied. The air which is sandwiched between the sublayers must be reliably removed and can escape through the channels formed by the surface structure.
The outer and inner glass sheets are preferably joined into a composite glass sheet in step S3 by lamination under heat, vacuum and/or pressure through a thermoplastic interlayer. Methods known per se for producing composite glass panes can be used advantageously here. Even for mass production, no further adjustments or changes to the validated method are necessary.
For example, the so-called autoclave process may be carried out at elevated pressures of about 10 to 15 bar and temperatures of 130 to 145 ℃ for about 2 hours. The vacuum bag or vacuum ring method known per se works, for example, at about 200 mbar and 80 ℃ to 110 ℃. The outer glass sheet, the thermoplastic interlayer and the inner glass sheet may also be pressed into a glass sheet in a calender between at least one pair of rollers. This type of apparatus is known for making glass sheets and typically has at least one heating tunnel in front of the press. The temperature during pressing is, for example, 40 ℃ to 150 ℃. The combination of the calender process and the autoclave process has proven particularly useful in practice. Alternatively, a vacuum laminator may be used. It consists of one or more heatable and evacuable chambers in which glass plates are laminated in, for example, about 60 minutes at a reduced pressure of 0.01 mbar to 800 mbar and a temperature of 80 ℃ to 170 ℃.
The invention also comprises the use of the composite glass pane with antiglare tape according to the invention in a land, water and air vehicle, in particular as a vehicle glazing, preferably as a windscreen pane, rear glazing or side glazing for a passenger motor vehicle, preferably as a panoramic windscreen pane or panoramic rear glazing.
All references to standards refer to the effective version at the filing date.
The various embodiments of the invention may be implemented individually or in any combination. In particular, the features mentioned above and to be explained below can be used not only in the combination shown but also in other combinations or alone without departing from the scope of the invention. Unless the embodiments and/or features thereof are explicitly mentioned only as alternatives or mutually exclusive.
The invention is explained in more detail below with reference to examples and figures. It should be noted here that different aspects are described, which can be used alone or in combination. That is, each aspect may be used with a different embodiment of the invention, unless explicitly shown as a mere alternative.
Examples
For the examples, i.e. the examples according to the invention and the comparative examples, respectively, the composite glass sheets according to the invention were produced as panoramic windshields with acoustic PVB films having a thickness of 0.81 mm. The PVB film used in each case had an embossed surface with a roughness Rz = 50 μm, which was optimized for further processing and degassing in the vacuum bag method. The PVB has an adhesion here such that the pummel value of the resulting composite glass sheet reaches 3 to 6. The so-called pummel test is a method known to those skilled in the art for determining the adhesion between a thermoplastic film and an adjacent one of a composite glass sheet. If there is no adhesion, the pummel value measured in the pummel test is 0, and a value of 10 indicates very high adhesion. The geometry of the PVB is adapted to the dimensions of the outer and inner glass plates used and has a height of 1.4 m from the engine edge to the top edge with the antiglare tape occupying a width of 45 cm from the top edge, measured from the 140 cm. The outer glass plate TSA3+ used in each case was a green-tinted glass plate with a thickness of 2.1 mm. Clear PLC (Planeclear) glass plates with a thickness of 1.6 mm were used as inner glass plates, respectively. For example composite glass panels, a surrounding cover print, for example manufactured as a black screen print, as is typically provided in vehicle glass panels, is omitted.
Measurement principle and measurement instrument:
the spectral measurement is carried out with the aid of a spectrophotometer (e.g., Lambda 900). From this, the transmission spectrum and the reflection spectrum can be measured and various parameters, such as the light transmittance tl (a) or the total solar transmittance TTS (total solar transmittance), can be determined therefrom.
The light transmission TL (A) is determined according to ASTM D1003-61 or according to DIN ISO 5033/EN 410. An A/2 DEG lamp type is used for this purpose. The TTS value is calculated according to ISO 13837 convention a.
The measurements were performed in the darkest regions of the samples, respectively, i.e., at the location of the composite glass sheet where the light transmission was lowest in the antiglare tape. This is a wide area (with a more or less constant light transmission TL (embodiment TL 2% or TL (a) 1.8% shown in fig. 2.) the antiglare tape has a width of 45 cm in this embodiment and is here at a distance of about 95 cm to 140cm from the engine edge of the windshield panel, wherein the top edge of the windshield panel forms a distance of 140cm from the engine edge.
In table 2, two examples according to the present invention, i.e., composite glass sheets having an antiglare tape, in which an antiglare region contains 0.1 to 0.3 wt% of ITO particles (indium tin oxide) as heat-shielding particles, and two composite glass sheets as corresponding comparative examples (V1 and V2), respectively, in which the antiglare region does not contain heat-shielding particles, were manufactured and examined as described above.
TABLE 1
Outer glass plate PVB film type Inner glass plate TL (A) TTS
B1 2.1 mm TSA3+ 2% TL comprising ITO particles 1.6 mm PLC 1.8% 27.4%
V1 2.1 mm TSA3+ 2% TL, ITO particles not containing 1.6 mm PLC 1.8% 29.6%
B2 2.1 mm TSA3+ 13% TL comprising ITO particles 1.6 mm PLC 11.2% 32.5%
v2 2.1 mm TSA3+ 13% TL free of ITO particles 1.6 mm PLC 11.2% 36.0%
Suitable measurement positions are located at a height of 100 cm to 135 cm for the composite glass sheets of the examples as shown in table 1, i.e. for the two examples according to the invention, i.e. B1 with a light transmittance TL of 2% and B2 with a light transmittance TL of 13%, for the thermoplastic film used in the colored antiglare region, and for the corresponding composite glass sheets V1 (TL = 2% of film) and V2 (TL = 13% of film) of the two comparative examples, respectively, which do not contain heat shielding particles in the antiglare region. In order to avoid possible influences due to the glass edge, for example scattering effects, the measurement is carried out at a distance of at least 2-3 cm from the glass edge. Furthermore, the measurement is not carried out directly at a height of 95 cm (i.e. at the beginning of the antiglare region) to ensure that it is already in the darkest region, i.e. the light transmission is constantly at the lowest value.
The measured light transmission tl (a) of the composite glass pane according to example B1 of the invention and comparative example V1 was in each case identically 1.8%. The TTS value of the composite glass sheet from B1 was 27.4%, and therefore was significantly improved compared to the control value of 29.6% from V1. The same is also observed when comparing the measurements from the composite glass sheets from B2 and V2, where a TTS value of 32.5% is measured in the embodiment according to the invention (example B2) of a composite glass sheet with heat-shielding particles in the antiglare region at the same tl (a) value of 11.2%, whereas a TTS value of 36% is reached in comparative example V2.
Overall, in the case of a low light transmission tl (a) < 12% of the composite glass pane 100 in the antiglare tape 1, a low total transmitted thermal radiation of < 33% can be simultaneously achieved according to the invention. Compared with the comparative example at the same light transmittance TL (A), an improvement of 2-3% in the TTS value can be achieved according to the invention.
In which is shown:
FIG. 1 is a schematic top view of a windshield panel having an antiglare tape;
FIG. 2 is a graph of light transmittance distribution versus height of the windshield of FIG. 1 (according to example B1);
FIG. 3 a: a section through a film 10 for forming an interlayer of a windscreen panel 100 according to the invention, the interlayer being designed as a standard PVB interlayer with heat-shielding particles in the antiglare region;
FIG. 3 b: a cross section through a windshield panel with heat shielding particles according to the invention with an acoustic PVB interlayer with heat shielding particles in the antiglare region.
Fig. 1 shows a top view of a composite glass pane 100 with an antiglare tape 1 according to the invention, which in one embodiment is designed as a windshield pane, in particular a panoramic windshield pane. Here, the height of the windshield from the engine edge M to the top edge D and the width of the antiglare tape 1 are designed to be larger than the standard windshield. For example, the width of the antiglare tape 1, measured from the top edge D, may be >40 cm, for example 45 cm, as described in example 1. The windshield is usually provided in its edge region in a peripheral manner with a cover print, for example in the vicinity of the edge a with a black screen print, which visually covers, for example, the lines and connections in the transition of the windshield to the vehicle body.
The windscreen panels have a central field of view, which puts high demands on their optical quality. The central field of view must have a high light transmission (typically greater than 70%). The central field of view is in particular a field of view known to the person skilled in the art as B-field of view, B-field of view or B-field of view. The field of view B and its technical requirements are specified in the european union economic commission (UN/ECE) No. 43 regulation (ECE-R43, "uniform conditions for approval of safety glazing materials and their installation in vehicles"). There, a B field of view is defined in the appendix 18.
The antiglare region 5 is designed colored within the composite glass pane and has the geometric dimensions of the antiglare tape 1 in plan view. The antiglare region 5 is preferably designed wedge-shaped in cross section and therefore preferably has a transmittance distribution at least at its lower end toward the engine edge M, in which the transmittance increases toward the central viewing field and the hue likewise progresses toward the central viewing field. This produces a visually more appealing appearance of the transition area of the antiglare belt to the clear field of view B.
Fig. 2 shows a graph of the light transmission from fig. 1 (in the embodiment without covering print a) versus the height of the windscreen panel from the engine edge M (at 0 cm) to the top edge D (at 140 cm) according to example 1 along the section X-X'. A light transmittance of about 1.8% in the darkest region of the antiglare tape 1 can be found in a region of about 100 cm to 140 cm. Then, a transition region of 100 cm to 95 cm follows, in which the transmission increases in the direction of the central field of view B and the hue likewise progresses in the direction of the central field of view B. According to the invention, this is achieved, for example, by a wedge-shaped cross section of the antiglare region 5. The composite glass pane meets the requirements for a clear B field of view for a windshield pane by a light transmission of about 78% in a further distribution of the windshield pane from about 95 cm up to the engine edge M.
The antiglare region 5 can be designed in cross section, in example 1, for example, starting from the top edge D (at 140 cm), in the region of 100 cm to 140cm, with a substantially constant thickness to produce the same low light transmission, and only towards the opposite engine edge M, here, for example, in the region of 100 cm to 95 cm, is designed to be wedge-shaped in the antiglare end to provide the desired continuous transition in color to the B-vision region of the composite glass sheet 100. According to the present invention, the heat absorbing particles 6 are uniformly distributed in the antiglare region 5.
Fig. 3a shows a section through a thermoplastic film 10 for a windshield panel 100 according to the invention, which in a preferred embodiment has a standard PVB film with heat-shielding particles 6 in the glare-free area 5 as an intermediate layer. The antiglare region 5 is designed to have a wedge-shaped cross-section. According to the invention, the heat-shielding particles 6 may preferably comprise or consist of at least one metal or metal oxide, in particular selected from ITO, ATO, AZO, TiO 2 And Cs 2 WO 4 . The antiglare region comprises from 0.1 to 20 wt%, preferably from 1 to 10 wt%, particularly preferably less than 5 wt%, of heat-shielding particles 6, based on the total mass of the thermoplastic polymer material used to form the antiglare region 5 of the thermoplastic film 10.
Fig. 3b shows a section through a thermoplastic film 10 for a windscreen panel 100 according to the invention, which in a preferred embodiment acts as an acoustic film, for example an acoustic PVB interlayer 4 with heat shielding particles 6 in an antiglare region 5, wherein the antiglare region 5 is also designed here with a wedge-shaped cross section. The thermoplastic film 10 is designed to have three sublayers, and has an inner sublayer L I The inner sublayer having an outer sublayer L surrounding it that is specific to the thermoplastic film 10 A Higher plasticity or elasticity. This can be done, for example, by making the intron L I Containing a higher proportion of plasticizer. In the embodiment according to the invention described, it is advantageously possible to combine the provision of antiglare, improved thermal insulation by heat-shielding particles 6 in the antiglare region 5 and noise reduction.
According to the invention, a composite glass pane with an antiglare tape is provided with an improved thermal insulation function, which can be produced easily and cost-effectively, in particular in the embodiment as a panoramic windscreen pane. In addition to providing improved thermal comfort, other functions can be easily combined in design or implemented without complex adjustments in manufacturing.
List of reference numerals
100 composite glass plate
1 anti-dazzle belt
10 thermoplastic film
2 outer glass plate
3 inner glass plate
4 intermediate layer
5 anti-glare region
6 Heat-shielded particles
D top edge
M Engine edge
A cover printed area
Central visual field of B
L A Outer sublayer (layer) of acoustic membrane
L I The inner sublayer (layer) of the acoustic membrane.

Claims (15)

1. Composite glass pane (100) with an antiglare tape (1), comprising an outer glass pane (2) and an inner glass pane (3) which are joined to one another by an intermediate layer (4), wherein the intermediate layer (4) comprises a thermoplastic film (10) having a colored antiglare region (5) for forming the antiglare tape (1), and heat-shielding particles (6) are additionally dispersed only in the colored antiglare region (5) of the thermoplastic film (10), wherein the heat-shielding particles are nanoscale transparent particles having heat-reflecting or heat-absorbing properties.
2. Composite glass pane (100) with an antiglare tape (1) according to claim 1, characterised in that the heat-shielding particles (6) comprise or consist of at least one metal or metal oxide, in particular selected from Indium Tin Oxide (ITO), antimony-doped tin oxide (ATO), aluminium-doped tin oxide (AZO), titanium dioxide (TiO) 2 ) And cesium tungstate (Cs) 2 WO 4 )。
3. Composite glass pane (100) with antiglare tape (1) according to claim 1 or 2, characterised in that the heat-shielding particles (6) have an average particle size of 5 to 200 nm.
4. Composite glass pane with antiglare tape according to any one of claims 1 to 3, characterised in that the antiglare region comprises from 0.1 to 20% by weight, preferably from 1 to 10% by weight, particularly preferably less than 5% by weight, of heat-shielding particles (6), based on the total mass of the thermoplastic polymer material used to form the antiglare region (5) of the thermoplastic film (10).
5. Composite glass pane (100) with antiglare tape (1) according to any one of claims 1 to 4, characterised in that the antiglare region (5) is designed with a wedge-shaped cross section.
6. Composite glass pane (100) with an antiglare tape (1) according to any one of claims 1 to 5, characterised in that the thermoplastic film (10) comprises or consists of polyvinyl butyral (PVB), Ethylene Vinyl Acetate (EVA) or polyurethane as thermoplastic polymer and/or mixtures and/or copolymers thereof.
7. Composite glass pane (100) with an antiglare tape (1) according to any one of claims 1 to 6, characterised in that the antiglare region (5) has a width >30 cm.
8. Composite glass pane (100) with antiglare tape (1) according to any one of claims 1 to 7, characterised in that the thermoplastic film (10) is designed with a wedge-shaped thickness profile.
9. Composite glass pane (100) with antiglare tape (1) according to any one of claims 1 to 8, characterised in that the thermoplastic film (10) is an acoustic membrane with three sub-layers, comprising an inner sub-layer surrounded by two outer sub-layers, wherein the inner sub-layer has a higher plasticity and/or a higher elasticity than the outer sub-layer surrounding it.
10. Composite glass pane (100) with an antiglare tape (1) according to any one of claims 1 to 9, characterised in that the total transmitted thermal radiation value (TTS value) in the antiglare tape (1) is less than 35% according to ISO 13837 convention a.
11. Method for manufacturing a composite glass pane (100) with an antiglare tape (1) according to any one of claims 1 to 10, comprising the following steps
S1: providing a thermoplastic film (10) having colored antiglare regions (5), wherein heat-shielding particles (6) are dispersed in the antiglare regions (5);
s2: arranging a thermoplastic film (10) between an outer glass plate (2) and an inner glass plate (3) in a stacked sequence;
s3: the stacking sequence is bonded under heat, vacuum and/or pressure into a composite glass sheet (100).
12. The method according to claim 11, wherein the thermoplastic film (10) is provided in step S1 by co-extruding a first polymer material and a second colored polymer material for forming the antiglare region (5), wherein heat shielding particles are dispersed in the colored polymer material of the antiglare region (5).
13. Method according to claim 11 or 12, wherein the antiglare region (5) is designed with a wedge-shaped cross-section.
14. The method according to any one of claims 11 to 13, characterized in that the thermoplastic film (10) is designed with a surface structure having a roughness Rz of 15 μ ι η to 70 μ ι η, preferably 25 μ ι η to 50 μ ι η, measured according to DIN EN ISO 4287: 2010-07 and DIN EN ISO 4288: 199804.
15. Use of a composite glass pane (100) according to any one of claims 1 to 10 as a vehicle glass pane, in particular as a windscreen pane, rear glass pane or side glass pane of a passenger motor vehicle.
CN202180004945.9A 2021-01-11 2021-12-15 Composite glass pane with improved heat insulation and antiglare tape Pending CN115087542A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP21150937 2021-01-11
EP21150937.7 2021-01-11
PCT/EP2021/085903 WO2022148618A1 (en) 2021-01-11 2021-12-15 Composite pane comprising a sun glare protection band having an improved thermal protection function

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WO (1) WO2022148618A1 (en)

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Publication number Priority date Publication date Assignee Title
US3715420A (en) 1969-07-19 1973-02-06 Sekisui Chemical Co Ltd Process for producing a thermoplastic resin sheet having a color band
US4562023A (en) 1981-08-18 1985-12-31 Dynamit Nobel Aktiengesellschaft Process and apparatus for producing a synthetic resin sheet having a colored band of varying color intensity
USD379718S (en) 1994-08-18 1997-06-10 Norseman Plastics Limited Container
WO2001025162A1 (en) 1999-10-01 2001-04-12 Sekisui Chemical Co., Ltd. Intermediate film for laminated glass and laminated glass
JP2002326846A (en) 2001-04-27 2002-11-12 Sekisui Chem Co Ltd Interlayer for laminated glass and laminated glass
JP4460550B2 (en) 2006-06-20 2010-05-12 日本板硝子株式会社 Laminated glass
WO2011019062A1 (en) 2009-08-12 2011-02-17 旭硝子株式会社 Laminated glass for use in vehicles

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