EP2928689A1

EP2928689A1 - Insulating glass window having high thermal insulation and reduced transmissivity for ir radiation

Info

Publication number: EP2928689A1
Application number: EP13805797.1A
Authority: EP
Inventors: Alexander Meyer; Timo Kuhlmann; Rafael Oser
Original assignee: Bayer MaterialScience AG
Current assignee: Covestro Deutschland AG
Priority date: 2012-12-04
Filing date: 2013-11-29
Publication date: 2015-10-14
Also published as: CN104837624A; WO2014086665A1; US20150330137A1

Abstract

The invention relates to insulating glass units having high thermal insulation and reduced transmissivity for IR radiation comprising at least two spaced-apart glass panes and at least one spaced-apart sheet of special polycarbonate containing a gas mixture within these units.

Description

Insulated glass windows with high thermal insulation and reduced permeability to IR radiation

The invention relates to insulating glass units with high thermal insulation and reduced permeability to IR radiation from at least two spaced glass panes and at least one spaced disc of special polycarbonate containing a gas mixture within these units. Insulating glass windows make a major contribution to reducing the heat consumption of buildings. In addition to the thermal insulation, it also achieves sound insulation.

The thermal resistance 1 / A of a component is used to assess the thermal insulation and the heat transfer coefficient k to assess the transmission heat loss of components. The heat transfer coefficient k is calculated from the heat transfer resistance 1 / A taking into account the heat transfer resistances oti / _a on the inside or outside after k = - i--. For multi-pane glasses i = + + - \ -

The heat loss through a multi-pane glass is made up of two amounts together the heat transfer loss and the heat radiation loss.

The heat transfer through a multi-pane insulating glass unit is determined by the heat transfer resistance of the glass and the filling gas. The thermal radiation through an insulating glass unit is determined by the optical properties of the glass panes. When using normal glass, the solar heat radiation (NIR range) occurs practically unhindered through the glass.

The requirements for thermal protection have become higher. Therefore the thermal protection requirements are adapted. The aim of such regulations (eg the Energy Saving Ordinance EnEV, Germany, or the EnergyStar Program of the European Union) is to keep the heat losses for the entire building as small as possible. Therefore, the thermal insulation properties of the individual components must be chosen so that the predetermined k-value for the entire building is not exceeded. The window surfaces have a major influence on the k-value of the entire building, as the k-value of the windows is significantly worse than that of the masonry. The use of double or multiple glazing with air in the space between the panes has already brought about significant improvements compared to glazing with single panes. For example, the k-value was reduced from 5.7 W / m ² K for single disks to 3.0 W / m ² K for double disks and up to 2.0 W / m ² K for triple disks. By suitable coating of the glass panes, the k-value could be significantly reduced. The coatings customary today are multilayer coatings containing at least one metal layer based on gold, silver, copper, indium, tin and aluminum, which are a few nanometers thick. Such layer structures - also called low-E layers or solar control layers - have the disadvantage of easily corroding. In addition, they distort the visual impression of a building as a solar control layer, as this layer always causes a change in the reflected and transmitted light in the visual area. Furthermore, it is costly and therefore expensive to apply these low-E or solar control layers on the glass.

Furthermore, in the current state of the art corresponding triple glass panes in comparison to dual elements, the weight is very high. Therefore z.T. Frame elements such as Türoder window frames are reinforced, as they warp when opening the window or the door. Furthermore, the transport and handling of such heavy discs require a lot of effort.

Despite triple glazing there is the possibility of glass breakage due to external influences such as storm damage, vandalism, storm, etc. Such discs thus do not constitute effective burglary protection.

Likewise, these discs let through a high proportion of UV light. This can fade the interior, e.g. floor or furniture.

The invention has for its object to provide an insulating glass unit, which has good thermal insulation properties at the same time reduced NIR light transmission without having to integrate, for example, an expensive metal layer. In the context of the present invention, NIR means the transmission in the near range of the infrared spectrum from 780 nm to 2500 nm. Furthermore, the element should have a lower weight and a high resistance to external influences such as burglary attempts compared with the prior art glass triple glazings. In addition, the window element should have a low UV transmission expressed as optical density at 340 nm wavelength of greater than or equal to 1, preferably greater than or equal to 1.5, more preferably greater than 2. Furthermore, it is important that these properties over a long period substantially constant stay and do not change drastically under the weather. Furthermore, the structure of the element should be such that the highest possible light transmission is given with the highest possible color neutrality. Windows consisting of glass structures containing thermoplastic materials - including polycarbonate - are known in principle.

Glass structures containing thermoplastic materials, such as polyvinyl butyral, are known and described extensively. However, these structures do not serve as heat insulation in vehicle construction. Here are other requirements such as the safety of the vehicle occupants in the foreground. These structures are not suitable for the task described here and for the production of insulating glass windows.

Sandwich structures which, in addition to glass, also comprise polycarbonate panes, are described in DE 2515393. However, no insulating glass structures are described here. Also, no elements containing special filler gases are described. DE 2515393 does not disclose discs characterized by low IR radiation transmittance. WO1991002133 describes a multi-pane structure comprising at least 2 IR-reflecting films based on metal layers. Here, the reflective foils are enclosed by 2 glass panes. The disadvantage of this structure is that the heat of the reflective films are not dimensionally stable, resulting in unwanted optical impressions. Another disadvantage with the use of the reflective films is the electromagnetic shielding of the metal layers used.

US 6265054 relates to glass structures containing transparent plastic sheets; These structures are characterized by a low weight and a high modulus. However, no insulating glass windows are described. No structures are described, which are characterized by a low energy transmission. From US 6265054 it is not apparent how to solve the problem described.

In US 5589272, thermoplastic materials are direct, i. without intervening gas layer, interconnected. The glass layers are very thin and are only intended to ensure the scratch resistance of the system. In the present application, however, it is about insulating glass window; the individual discs are not in direct communication with each other - they are e.g. not laminated together. Another lamination concept is described in US4600640.

In EP 963171 window assemblies are described consisting of two outer glass panes and an inner shatterproof disc, preferably made of polycarbonate. These structures differ from the structure described here in the functional layers. In EP 963171 the structures do not allow for reduced energy transmission. Furthermore, no Isolierglasaufbauten with corresponding filling gases described. It is not apparent from EP 963171, how the task set here would be solved.

WO 9633334, DE 60029906, WO 02/29193 and WO 98/34521 all describe different constructive interpretations of triple insulating glass covers containing a polycarbonate pane, which is arranged at a distance of two glass panes. The use of fillers or pigments in the polycarbonate disc is not mentioned. Furthermore, no reference is made to an improvement in the IR protection effect by the addition of such additives.

EP 2213490 describes an automotive glass containing finely divided fillers or pigments for the purpose of improving the IR protection effect. The use or the corresponding position of such a modified disc in a triple insulating glass construction is not mentioned.

EP 1865027 relates to borides in polycarbonate resin compositions, inter alia for use in glazings. The use of such polycarbonate resin compositions in insulating glass structures is not mentioned. Furthermore, the object of the present invention of providing a structure having a high light transmission with good color neutrality is not solved by the inherent color of the borides.

JP 2008214596 reports the use of tungsten oxides in polycarbonate resin compositions for the purpose of improving the IR protection effect. The use of these modified polycarbonates as glazings in insulating glass structures is not mentioned. Furthermore, no reference is made to the mandatory installation position of the modified pane between 2 panes of glass in order to achieve a long-term IR protection effect. The object of the present invention is therefore not solved in the approach.

GB 1328576 also describes glassware containing thermoplastic materials. However, these glass structures do not have the low energy transmission described here. Nor is it suggested how to achieve low energy transmission. All of the above documents describe window constructions containing thermoplastic materials. However, it is not apparent to those skilled in the art from these sources how the problem posed here would be solved. One skilled in the art would be aware of the theoretical concepts of the prior art, but could not achieve the required low energy transmission of the prior art. Although all of the above-mentioned documents describe theoretical concepts, they remain unclear, so that a very large number of design possibilities are available to the person skilled in the art yield such glass-plastic composites. The present solution of the problem will not be described here.

Also, many alternative approaches exist in the prior art as to how the passage of heat radiation through a window can be prevented. Thus, IR-reflecting layers or pigments or IR-absorbing pigments can be used. For example, e.g. by Schelm et al. in Applied Physics Letter, 2003, Vol. 82 (24), p. 4346, use IR-protected PVB and laminate it with glass. However, this structure does not have the required insulation properties and also shows a distinct intrinsic color.

Because of the large selection of IR absorbers described in the prior art, the skilled person can not recognize which IR absorbers are to be selected preferentially and how the functional layers are to be arranged relative to one another in order to fulfill the task. Likewise, the skilled person can not decide which systems lead to a high weathering stability for this application.

The invention has for its object to provide an insulating glass unit, which has good thermal insulation properties at the same time reduced NIR light transmission without having to integrate, for example, an expensive metal layer. In the context of the present invention, NIR means the transmission in the near range of the infrared spectrum from 780 nm to 2500 nm. Furthermore, the element should have a lower weight and a high resistance to external influences such as burglary attempts compared with the prior art triple glass glazings. In addition, the window element should have a low UV transmission. Furthermore, it is important that these properties remain largely constant over a long period of time and do not change drastically under the effects of weathering. Furthermore, the structure of the element should be such that the highest possible light transmission is given with the highest possible color neutrality. For example, the color coordinates a * and b * in the Lab system should be in the range from -4 to +4, preferably in the range from -3 to +3 (the determination of the color can be based on ASTM E 348 with the in The object is achieved by a triple element containing in the following order

A) a first glass pane,

B) another disc containing or consisting of polycarbonate and

C) another glass pane, wherein the triple element is characterized in that a filling gas is present between the individual disks, preferably air, Ar, Kr, Xe, He, SFÖ, CO2, and that the polycarbonate contains at least one nanoscale inorganic pigment.

Surprisingly, the object is achieved in that a certain structure is chosen, in which the polycarbonate disk equipped with special nanoscale pigments is arranged between two glass panes, as shown, for example, in FIG.

It has surprisingly been found that when the polycarbonate pane is directly exposed to the ambient air, however, the IR protection effect of the overall structure is significantly lower over time. However, those skilled in the art would expect the IR protection to be independent of the disposition of the disks.

The object was achieved by an insulating glass unit (IGU: Insulated Glazing Unit) (see FIG. 1 as a possible embodiment) containing in the following order:

A. a first - optionally additionally coated - glass

B. another - possibly coated - disc made of polycarbonate

C. another - possibly additionally coated - glass pane, characterized in that the disc B. is spaced from the glass sheets A. and C. respectively and further the resulting by the spacing volumes with at least one gas selected from the group consisting of Air, neon, argon, krypton, xenon, helium, sulfur hexafluoride, and carbon dioxide and mixtures thereof, more preferably air, argon, krypton and xenon and mixtures thereof and most preferably argon and

Krypton and their mixtures are filled and the polycarbonate contains special nanoscale inorganic particles.

Typically, in the aforementioned insulating glass unit or the triple element, the individual disks are spaced parallel to one another, resulting in the aforementioned volumes or cavities. The insulating glass unit or the triple element can also be provided with a peripheral edge compound which is fixed on the abutting edges of the discs, so that the gas provided between the discs is included.

In the case of the above-mentioned optionally coated glass panes, coatings are used which contain a multilayered layer structure of at least one metal layer based on gold, silver, copper, indium, tin and / or aluminum, which are a few nanometers thick. Preferably, the glazing element has a gas-tight edge bond with an annual transmission rate of not more than 1% of the filling gas.

A particular advantage of the invention is the high blocking effect against NIR radiation. As a result, the interior of a building heats up less, for example, than if a triple structure without NIR block effect was used. The heat transfer by convection, however, is significantly reduced by the triple arrangement of the discs in combination with the filling gases. Through the use of polycarbonate, which has a low coefficient of thermal conductivity compared to glass, a further advantage is achieved.

The energy transmission is preferably less than 50%, preferably less than 45%, and particularly preferably less than 42%, at the time t = 0 (ie, un-weathered), represented as "Direct Solar Energy Transmission" Tds UV absorption, expressed as optical density at 340 nm wavelength preferably greater than 1, more preferably greater than or equal to 1, 5, most preferably greater than or equal to 2. The light transmission is preferably at least 40%, more preferably at least 50%, and is most preferably greater than 60%.

Preferably, the data with respect to light transmission and energy transmission in weathering effect does not change or only slightly. Particularly preferably, the light transmission changes absolutely by not more than 2%>, measured after 500 hours of weathering (weathering in a climatic chamber at 90 ° C and 90% relative humidity). Analogously, the Tds value changes by less than 6%, preferably less than 5%.

In the context of the insulating glass unit according to the invention, the glass sheets A. and C. are characterized in that they independently of one another have a thickness of 2 mm to 10 mm, preferably 3 mm to 8 mm.

The glass sheets are preferably made of conventional float glass, e.g. Alkali-lime glass, preferably soda lime glass.

The polycarbonate pane B) is either single-layered or in the form of a polycarbonate multilayer system comprising a polycarbonate layer and further functional layers applied thereto on one or both sides and has a total thickness of 2 mm to 15 mm, preferably 3 mm to 10 mm and particularly preferably 4 mm up to 8 mm. The construction of insulating glass units containing a gas-tight edge bond with an annual FUUgas transmission rate of not more than 1% of the filling gas from two or more glass panes or combinations of glass panes with plastic panes is known. Usually, in addition to the glass and / or plastic discs still sealing and / or adhesives and spacers and desiccant used.

The spacer consists mainly of metal (usually aluminum or stainless steel), is placed in the edge region of the discs and has the task to produce the desired distance between the discs. The distance of the individual disks is preferably from 6mm to 16mm, more preferably from 6mm to 12mm. Additionally, a desiccant (eg, a molecular sieve or zeolite) is contained within the hollow spacer to keep the volume of air or gas trapped in the space between the panes dry. So that a moisture absorption of the desiccant can take place at all, the side of the spacer facing the space between the panes is provided with small openings (longitudinal perforation). This prevents moisture from condensing on the insides of the panes at low ambient temperatures, resulting in visual impairment.

Between the discs facing sides of the spacer and the inner surfaces of the discs is a so-called primary seal based on polyisobutylene and / or butyl rubber. The purpose of the primary seal is a) during the manufacture of the insulating glass panes to be a kind of "assembly aid" when joining the discs with the pre-coated with the primary seal spacers to this

B) later during the "life" of the insulating glass unit to form a water vapor barrier to penetrate from outside to inside the space between the panes and to prevent in the case of gas-filled units loss of the filling gas from the space between the panes to the outside Since the circumferentially outwardly directed edge of the spacer is set back by a few millimeters against the outer edges of the disks, a "gutter" is formed. In this space, the so-called secondary seal is injected, which has the task primarily to elastically bond the edge of the insulating glass unit (discs and spacers) and also to a certain extent a seal against water / water vapor from the outside and gas from the inside (Disc space) to form. As a rule, the secondary seal consists of two-component sealants or adhesives based on polysulfide, polyurethane or silicone which crosslink at room temperature. component Systems, such. B. based on silicone or a hot applied butyl hot melt adhesive, are also possible.

In particular, the spacers extruded directly onto a pane eliminate disadvantages, inter alia, with regard to the production process of the abovementioned metal-based spacers, and a considerably more flexible and productive automatic production of insulating glass panes has become possible.

The thermoplastic material used combines both the function of the spacer and the so-called primary seal together and also contains the desiccant. An example of this is the so-called TPS system (TPS = Thermoplastic spacer). A preferred commercially available product is the Super Spacer ^® by the company Edgetech in which the conventional metallic spacer is replaced by a heat-fixed silicone foam matrix.

Also in these systems, the circumferentially outwardly directed edge of the spacer is recessed against the outer edges of the discs by a few millimeters and the remaining space is filled with the so-called secondary seal, which adheres the units elastic. In the case of silicone as a secondary seal has been found that in conjunction with a thermoplastic spacer, for. As the TPS system, much safer to produce even with inert gas filled elements that retain their gas tightness in the edge bond even after prolonged weathering cycles (EP 916 801 A2).

The argon gas transmission rate of an insulating glass unit is determined in accordance with EN 1279-3: 2002 D "Multi-pane insulating glass - Part 3: Long-term test methods and requirements for gas loss rate and gas concentration limit deviations".

The polycarbonate disc B. contains at least one nanoscale inorganic IR-absorbing pigment. These may be antimony derivatives such as antimony tin oxides or indium derivatives such as indium tin oxides, tungsten derivatives such as special tungsten oxides or borides such as lanthanum hexaboride.

A selection of such materials is described, for example, in J. Fabian, H. Nakazumi, H. Matsuoka, Chem. Rev. 92, 1197 (1992), in US-A 5,712,332 or JP-A 06240146. EP 1865027 A1 describes polymer compositions of special polycarbonates which additionally contain lanthanum hexaboride as IR absorber. US2006 / 0251996 describes inorganic IR absorbers, including, inter alia, tungstates, which are used as IR-absorbing particles. However, no document describes the use of these pigments with multi-pane elements for building glazing. No document shows the long-term properties in building glazings or can be derived from these documents. The skilled person can not recognize due to the large number of described and available IR absorbers, which specific pigments are suitable for building glazing.

In a particular embodiment, nanoscale particles based on lanthanum hexaboride, preferably present in an acrylate dispersion, can be used as the IR absorber. This is advantageous if a green color impression is desired.

In most applications, however, a color-neutral color impression is desired. Therefore, for the purposes of the present invention, in particular nanaoparticles based on tungstates are preferred.

The tungstates to be used according to the invention are substances of the type a1) WyOz (W = tungsten, O = oxygen, z / y = 2.20-2.99) and / or a2) MxWyOz (M = H, he, alkali metal, alkaline earth metal, rare earth metal, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, T1, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi; x / y = 0.001-1.000, z / y = 2.2-3.0), where as M the elements H, Cs, Rb, K, T1, In, Ba, Li, Ca, Sr, Fe and Sn are preferred, of which Cs is very particularly preferred. Particularly preferred are BaO, 33WO 3, T10, 33WO 3, KO, 33WO 3, RbO, 33WO 3, Cs 0.33 WO 3, Na 0.33 WO 3, Na 0.75WO 3, and mixtures thereof.

In a particular embodiment of the present invention, the sole use of CsO, 33WO 3 as the inorganic IR absorber is very particularly preferred. Also known are compounds with Cs / W ratios of 0.20 and 0.25.

In a further preferred embodiment, zinc-doped tungstates are used.

In the case of the tungstate, there is no restriction whatsoever with regard to the Wolramat content in the glazing elements according to the invention. However, the tungstates are preferably used in an amount of 0.0001% by weight - 10.0000% by weight, particularly preferably 0.0010% by weight - 1.0000% by weight and very particularly preferably 0.0020% by weight .-% - 0.5000 wt .-% calculated as the solids content of tungstate or zinc-doped tungstate in the overall polymer composition used. In a particular embodiment of the invention, the amount of the tungstates used according to the invention is 0.0090% by weight to 0.0500% by weight, again indicated as the solids content of tungstate in the overall polymer composition. Solids content of tungstate in this context means the tungstate as a pure substance and not a dispersion, suspension or other preparation containing the pure substance, whereby the following information for the tungstate content always refer to this solids content, unless explicitly stated otherwise.

These concentrations are preferably used for polycarbonate sheets having thicknesses of 2 to 15 mm, preferably 3 to 10 mm and particularly preferably 4 to 8 mm.

The mean particle diameter of the nanoscale particles used according to the invention (preferably tungstates) is preferably less than 200 nm, particularly preferably less than 10 nm. The particles are permeable in the visible region of the spectrum, wherein permeable means that the absorption of these IR absorbers in the visible region of the light compared to the absorption in the IR region is low and the IR absorber to no significantly increased turbidity or significant reduction of the Transmission (in the visible region of the light) of the composition or the respective final product.

The tungstenates of the type a2) have an amorphous, a cubic, tetragonal or hexagonal tungsten bronze structure, wherein M is preferably H, Cs, Rb, K, Tl, Ba, In, Li, Ca, Sr, Fe and Sn ,

For producing such materials, e.g. Tungsten trioxide, tungsten dioxide, a hydrate of a tungsten oxide, tungsten hexachloride, ammonium tungstate or tungstic acid, and optionally further salts containing the element M, e.g. Cesium carbonate, mixed in certain stoichiometric ratios, so that the molar ratios of the individual components are represented by the formula MxWyOz. This mixture is then heated at temperatures of from 100 ° C to 850 ° C in a reducing atmosphere, e.g. an argon-hydrogen atmosphere, treated and finally the resulting powder at temperatures of 550 ° C to 1200 ° C under an inert gas atmosphere annealed.

To produce the inorganic IR absorber nanoparticles according to the invention, the IR absorber can be mixed with the dispersants described below and other organic solvents such as toluene, benzene or similar aromatic hydrocarbons and in suitable mills, such as ball mills, with the addition of zirconium oxide (eg with a diameter of 0.3 mm) to produce the desired particle size distribution. The nanoparticles are obtained in the form of a dispersion. After grinding, further dispersants may optionally be added. The Solvent is removed at elevated temperatures and reduced pressure. Preference is given to nanoparticles which have an average size of less than 200 nm, more preferably less than 100 nm.

The size of the particles can be determined by means of transmission electron spectroscopy (TEM). Such measurements on IR absorber nanoparticles are e.g. in Adachi et al., J. Am. Ceram. Soc. 2008, 91, 2897-2902.

The preparation of the tungstates of the invention is e.g. in EP 1 801 815 AI and they are commercially available e.g. at Sumitomo Metal Mining Co., Ltd. (Japan) available under the designation YMDS 874. For use in transparent thermoplastics, the particles thus obtained are dispersed in an organic matrix, e.g. in an acrylate, and optionally in a mill, as described above, using suitable excipients, e.g. Zirconia and optionally ground using organic solvents such as toluene, benzene or similar hydrocarbons. Suitable polymer-based dispersants are especially dispersants which have a high light transmission, such. Polyacrylates, polyurethanes, polyethers, polyesters or polyester urethanes and polymers derived therefrom.

Preferred dispersants are polyacrylates, polyethers, and polyester-based polymers, where as high temperature stable dispersants polyacrylates such as e.g. Polymethyl methacrylate and polyester are particularly preferred. It is also possible to use mixtures of these polymers or else acrylate-based copolymers. Such dispersing aids and methods for the preparation of tungstate dispersions are e.g. in JP 2008214596 and in Adachi et al. J. Am. Ceram. Soc. 2007, 90 4059-4061.

Dispersants suitable for the present invention are commercially available. In particular, polyacrylate-based dispersants are suitable. Such suitable dispersants are e.g. under the

Trade name EFKA®, e.g. EFKA® 4500 and EFKA® 4530 are available from Ciba Specialty Chemicals.

Polyester-containing dispersants are also suitable. For example, you are among the

Trade names Solsperse®, e.g. Solsperse® 22000, 24000SC, 26000, 27000 available from Avecia.

Furthermore, polyether-containing dispersants are known, for example, under the trade names Disparlon® DA234 and DA325 from Kusumoto Chemicals. Also polyurethane based systems are suitable. Polyurethane-based systems are available under the trade name EFKA® 4046, EFKA® 4047 from Ciba Specialty Chemicals. Texaphor® P60 and P63 are corresponding trade names of Cognis.

The amount of the IR absorber in the dispersant is from 0.2% by weight to 50.0% by weight, preferably from 1.0% by weight to 40.0% by weight, more preferably 5% by weight to 35% by weight. %>, and most preferably 10% by weight> - 30% by weight> based on the dispersion of the inorganic IR absorber used according to the invention. In the overall composition of the ready-to-use IR absorber formulation, in addition to the IR absorber pure substance and the dispersant, further auxiliaries, such as, for example, zirconium dioxide and residual solvents, such as, for example, toluene, benzene or similar aromatic hydrocarbons, may be present. In a further embodiment, in addition to the tungstates according to the invention as IR absorber, additional IR absorbers may additionally be used, the proportion of which in terms of quantity and / or power in such a mixture being below those of the above-described tungstates. For mixtures, preference is given here to compositions which contain two to five inclusive and particularly preferably two or three different IR absorbers. The further optional IR absorber is preferably selected from the group of borides and tin oxides, particularly preferably contains LaB6 or antimony-doped tin oxide or indium tin oxide.

In an alternative embodiment of the present invention, the polymer composition of the present invention does not contain any inorganic boron boride type IR absorbers such as Lanthanum Hexaboride, La.Be. In a further preferred embodiment, the additional IR absorber (s) has an absorption spectrum different from the tungstate used, based on the absorption maxima, so that a maximum absorption range is covered by the maxima.

Suitable additional organic infrared absorbers are described in substance classes eg in M. Matsuoka, Infrared Absorbing Dyes, Plenum Press, New York, 1990. Especially suitable are infrared absorbers from the classes of phthalocyanines, naphthalocyanines, metal complexes, azo dyes, anthraquinones, squaric acid derivatives, immonium dyes, perylenes, quaterylenes and polymethines. Of these, phthalocyanines and naphthalocyanines are particularly suitable. This has the particular effect that certain absorptions in narrow ranges can be combined in addition to absorption by the inorganic pigments. Because of the improved solubility in thermoplastics, phthalocyanines and naphthalocyanines having bulky side groups are preferable, such as phenyl, phenoxy, alkylphenyl, alkylphenoxy, tert-butyl, (-S-phenyl), -NH-aryl, -NH-alkyl, and the like.

Furthermore, compounds such as indium oxide, which is doped with 2 to 30 atom%, preferably with 4 to 12 atom% tin (ITO) or with 10 to 70 atom% fluorine, can be added.

Particularly preferred is the combination with tin oxide as a further IR absorber which is doped with 2 to 60 atom% of antimony (ATO) or with 10 to 70 atom% of fluorine.

Further, zinc oxide particularly doped with 1 to 30 at%, preferably 2 to 10 at% of aluminum or 2 to 30 at% indium or 2 to 30 at% gallium is particularly suitable. Mixtures of the abovementioned infrared absorbers are particularly suitable, since the skilled person can achieve an optimization of the absorption in the near infrared range by a targeted selection.

The polycarbonate for the polycarbonate disc B further preferably contains at least one mold release agent.

In this case, 0.0 wt .-% to 1, 0 wt .-%, preferably 0.01 wt .-% to 0.50 wt .-%, particularly preferably 0.01 wt .-% to 0.40 wt. -% one or more demoulding machines, based on the total amount of demolders used. Particularly suitable mold release agents for the composition according to the invention are pentaerythritol tetrastearate (PETS) or glycerol monostearate (GMS).

The polycarbonate for the polycarbonate disc B. preferably contains at least one UV absorber.

In this case, from 0.0% to 20.00% by weight, preferably from 0.05% by weight to 10.00% by weight, more preferably from 0.10% by weight to 1.00% by weight, are still more preferably 0.10% by weight to 0.50% by weight and very particularly preferably 0.10% by weight to 0.30% by weight of at least one or more UV absorbers, based on the total amount of UV Absorbers used; or 0.00% to 20.00% by weight, preferably from 0.05% to 10.00% by weight, more preferably from 0.10% to 1.00% by weight, still more preferably 0.10 wt .-% to 0.50 wt .-% and most preferably 0.10 wt .-% to 0.30 wt .-% of at least one UV absorber used.

Suitable UV absorbers are described, for example, in EP 1 308 084 A1, in DE 102007011069 A1 and in DE 10311063 A1. Particularly suitable ultraviolet absorbers are based on benzotriazoles, triazines and biphenyltriazines, and in particular hydroxy-benzotriazoles, such as 2- (3 ', 5'-bis (l, l-dimethylbenzyl) -2'-hydroxyphenyl) benzotriazole (Tinuvin® 234, Ciba Spezialitätenchemie, Basel), 2- (2'-hydroxy-5 '- (tert-octyl) -phenyl) -benzotriazole (Tinuvin® 329, Ciba Spezialitätenchemie, Basel), 2- (2'- Hydroxy 3 '- (2-butyl) -5' - (tert-butyl) -phenyl) -benzotriazole (Tinuvin® 350, Ciba Spezialitätenchemie, Basel), bis- (3- (2H-benztriazolyl) -2-hydroxy- 5-tert-octyl) methane, (Tinuvin® 360, Ciba Spezialitätenchemie, Basel), (2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5- (hexyloxy) -phenol (Tinuvin® 1577, Ciba Spezialitätenchemie, Basel), and the benzophenones 2,4-dihydroxybenzophenone (Chimasorb® 22, Ciba Spezialitätenchemie, Basel) and 2-hydroxy-4- (octyloxy) benzophenone (Chimassorb® 81, Ciba, Basel), 2-propenoic acid, 2-cyano-3,3-diphenyl, 2,2-bis [[(2-cyano-1-oxo-3,3-diphenyl-2-propenyl) oxy] -methyl] -l, 3-propaned iyl ester (9CI) (Uvinul® 3030, BASF AG Ludwigshafen), 2- [2-hydroxy-4- (2-ethylhexyl) oxy] phenyl-4,6-di (4-phenyl) phenyl-1,3,5 triazines (Tinuvin 1600, Ciba Spezialitätenchemie, Basel) or tetra-ethyl-2,2'- (1,4-phenylenedimethylidenes) bismalonates (Hostavin® B-Cap, Clariant AG). It is also possible to use mixtures of these ultraviolet absorbers. In addition, the polycarbonate preferably contains processing and / or thermal stabilizers.

In this case, 0.00 wt .-% - 0.20 wt .-%, preferably 0.01 wt .-% - 0.10 wt .-%, one or more thermal or processing stabilizer, based on the total amount of thermal - or processing stabilizers, preferably selected from the group of phosphines, phosphites and phenolic antioxidants and mixtures thereof used. In a specific embodiment of the present invention, from 0.01% by weight to 0.05% by weight, preferably from 0.015% by weight to 0.040% by weight, of thermal or processing stabilizers is used.

Examples are triphenyl phosphite, diphenyl alkyl phosphite, phenyl dialkyl phosphite, tris (nonylphenyl) phosphite, trilauryl phosphite, trioctadecyl phosphite, distearyl pentaerythritol diphosphite, tris (2,4-di-tert-butylphenyl) phosphite, diisodecylpentaerythritol diphosphite, bis (2,4-di-tert-butyl - phenyl) pentaerythritol diphosphite, bis (2,4-di-cumylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, diisodecyloxypentaerythritol diphosphite, bis (2,4-di-tert-butyl) 6-methylphenyl) - pentaerythritol diphosphite, bis (2,4,6-tris (tert-butylphenyl) -pentaerythritol diphosphite, tristea-rylsorbitol triphosphite, tetrakis (2,4-di-tert-butylphenyl) -4,4'-biphenylene diphosphonite, 6 Isoctyloxy-2,4,8,10-tetra-tert-butyl-12H-dibenzo [d, g] -l, 3,2-dioxaphosphocine, bis (2,4-di-tert-butyl-6-methylphenyl) methyl phosphite, bis (2,4-di-tert-butyl-6-methylphenyl) ethyl phosphite, 6-fluoro-2,4,8,10-tetra-tert-butyl-12-methyl-dibenzo [d, g] -l , 3,2-dioxaphosphocine, 2,2 ', 2 "-nitrilo

[triethyltris (3, 3 ', 5, 5' -tetra-tert-butyl-1, 1'-biphenyl-2,2'-diyl) phosphite], 2-ethylhexyl (3, 3 ', 5, 5' - tetra-tert butyl-1, -biphenyl-2,2'-diyl) phosphite, 5-butyl-5-ethyl-2- (2,4,6-tri-tert-butylphenoxy) -l, 3,2-dioxaphosphirane, bis ( 2,6-di-tert-butyl-4-methylphenyl) pentaerytliritol dipliosplit, triphenylphosphine (TPP), trialkylphenylphosphine, bis-diphenylphosphino-ethane or a trinaphthylphosphine. Particular preference is given to using triphenylphosphine (TPP), Irgafos® 168 (tris (2,4-di-tert-butylphenyl) phosphite) and tris (nonylphenyl) phosphite or mixtures thereof.

Further, phenolic antioxidants such as alkylated monophenols, alkylated thioalkylphenols, hydroquinones and alkylated hydroquinones can be used. Particularly preferred are Irganox® 1010 (pentaerythritol-3- (4-hydroxy-3,5-di-tert-butylphenyl) propionate; CAS: 6683-19-8) and Irganox 1076® (2,6-di-tert-butyl -4- (octadecanoxycarbonylethyl) phenol) In a preferred embodiment, the polycarbonate contains special phosphates, in particular alkyl phosphates.

Suitable alkyl phosphates are, for. B. mono-, di- and trihexyl phosphate, triisoctyl phosphate and trinonyl phosphate. The alkyl phosphate used is preferably triisooctyl phosphate (tris-2-ethylhexyl phosphate). It is also possible to use mixtures of different mono-, di- and trialkyl phosphates. The alkyl phosphates used are used in amounts of less than 500 mg / kg, preferably from 0.5 to 500 mg / kg, more preferably from 2 to 500 mg / kg, most preferably from 5 to 300 mg / kg, and in a very preferred case from 1 0 to 120 mg / kg, based on the total weight of the composition used.

Mixtures of several transparent thermoplastic polymers, in particular if they are miscible with one another in a transparent manner, are also possible, with a mixture of polycarbonate with PMMA (more preferably with PMMA <2% by weight) or polyester being preferred in a specific embodiment.

Suitable polycarbonates for the production of the polycarbonate disc B are all known polycarbonates. These are homop olycarbonates, copolycarbonates and thermoplastic polyester carbonates.

The suitable polycarbonates preferably have average molecular weights _{Mw of} 10,000 to 50,000, preferably 14,000 to 40,000 and in particular 16,000 to 32,000, determined by gel permeation chromatography with polycarbonate calibration. The preparation of the polycarbonates is preferably carried out by the interfacial process or the melt transesterification process, which is varied in of the literature. For the interfacial process, see, for example, H. Schnell, "Chemistry and Physics of Polycarbonates", Polymer Reviews, Vol. 9, Interscience Publishers, New York 1964, p. 33 et seq., Polymer Reviews, Vol. 10, "Condensation Polymers by Interfacial and Solution Methods ", Paul W. Morgan, Interscience Publishers, New York 1965, Chapter VIII, p. 325, to Dres. U. Grigo, K. Kircher and P. R-Müller" Polycarbonates "in Becker / Braun, Kunststoff Handbook, Volume 3/1, polycarbonates, polyacetals, polyesters, cellulose esters, Carl Hanser Verlag Munich, Vienna 1992, pp 118-145 and to EP 0 517 044 AI referenced.

The melt transesterification process is described, for example, in the Encyclopedia of Polymer Science, Vol. 10 (1969), Chemistry and Physics of Polycarbonates, Polymer Reviews, H. Schnell, Vol. 9, John Wiley and Sons, Inc. (1964) and in US Pat Patent DE-B 10 31 512 and US-B 6 228 973 described.

The polycarbonates are preferably prepared by reactions of bisphenol compounds with carbonic acid compounds, in particular phosgene or in the melt transesterification process diphenyl carbonate or dimethyl carbonate.

Homopolycarbonates based on bisphenol A and copolycarbonates based on the monomers bisphenol A and 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane are particularly preferred here.

These and other bisphenol or diol compounds which can be used for the polycarbonate synthesis are disclosed, inter alia, in WO 2008037364 A1 (p.7, lines 21 to 10, line 5), EP 1 582 549 A1 ( 0018] to [0034]), WO 2002026862 A1 (page 2, line 20 to page 5, line 14), WO 2005113639 A1 (page 2, Z1 to page 7, line 20). The polycarbonates may be linear or branched. Mixtures of branched and unbranched polycarbonates can also be used.

Suitable branching agents for polycarbonates are known from the literature and described, for example, in US Pat. Nos. 4,185,009 and DE 25 00 092 A1 (3,3-bis- (4-hydroxyaryloxindoles according to the invention, see in each case the entire document), DE 42 40 313 A1 (see page 3, lines 33 to 55), DE 19 943 642 A1 (see page 5, lines 25 to 34) and US-B 5 367 044 and in the literature cited therein.

In addition, the polycarbonates used can also be intrinsically branched, in which case no branching agent is added during the polycarbonate production. An example of intrinsic branches are so-called frieze structures, as disclosed for melt polycarbonates in EP 1 506 249 A1. In addition, chain terminators can be used in polycarbonate production. The chain terminators used are preferably phenols such as phenol, alkylphenols such as cresol and 4-tert-butylphenol, chlorophenol, bromophenol, cumylphenol or mixtures thereof.

The polycarbonate composition of the invention for the polycarbonate disc B may contain further additives; while the above are excluded. The other additives are conventional polymer additives, e.g. the flameproofing agents described in EP-A 0 839 623, WO-A 96/15102, EP-A 0 500 496 or "Plastics Additives Handbook", Hans Zweifel, 5th Edition 2000, Hanser Verlag, Munich, optical brighteners, flow improvers, inorganic pigments The above-mentioned substances already disclosed as components of the present invention are in this context expressly not part of this additional additive component.

The composition must be below the temperatures usual for thermoplastics, i. at temperatures above 300 ° C, e.g. 350 ° C can be processed without changing the color or the performance data during processing significantly. The preparation of the polymer compositions according to the invention containing the additives mentioned above is carried out by conventional incorporation methods by combining, mixing and homogenizing, wherein in particular the homogenization preferably takes place in the melt under the action of shear forces. Optionally, the merging and mixing takes place before the melt homogenization using powder premixes. It is also possible to use premixes which have been prepared from solutions of the mixture components in suitable solvents, optionally homogenizing in solution and subsequently removing the solvent.

In particular, in this case the components of the composition according to the invention can be introduced by known methods such as, inter alia, as a masterbatch. The use of masterbatches and of powder mixtures or compacted premixes is particularly suitable for incorporating the abovementioned additives. In this case, optionally, all the aforementioned components can be premixed. Alternatively, however, premixes are possible. In all cases, for a better meterability in the preparation of the thermoplastic polymer compositions, the abovementioned additives are preferably filled up with a powdery polymer component in such a way that overall volumes which are easy to handle are formed. In a particular embodiment, the abovementioned components can be mixed to form a masterbatch, wherein the mixing preferably takes place in the melt under the action of shearing forces (for example in a kneader or twin-screw extruder). This process offers the advantage that the components are better distributed in the polymer matrix. For the preparation of the masterbatch, the preferred thermoplastic polymer is the polymer matrix, which is also the main component of the final overall polymer composition.

In this connection, the composition can be combined, mixed, homogenized and then extruded in conventional equipment such as screw extruders (for example twin-screw extruder, ZSK), kneaders, Brabender or Banbury mills. After extrusion, the extrudate can be cooled and comminuted. It is also possible to premix individual components and then to add the remaining starting materials individually and / or likewise mixed.

The polymer compositions according to the invention can be processed into the corresponding panels suitable for glazing elements, in which, for example, the polymer compositions are first extruded into granules as described and these granules are processed by suitable processes to give various panels in a known manner.

In this connection, the compositions according to the invention can be converted into the corresponding products, shaped bodies or shaped disks by hot pressing, spinning, blow molding, thermoforming, extrusion or injection molding, for example. Also of interest is the use of multilayer systems. The application may be simultaneous or immediately after the formation of the body, e.g. by coextrusion or multi-component injection molding. The application can also be done on the finished shaped body, e.g. by lamination with a film or by coating with a solution.

Plates or moldings of base and optional cover layer / optional cover layers (multilayer systems) can be produced by (co) extrusion, direct skinning, direct coating, insert molding, film back-injection or other suitable processes known to the person skilled in the art.

Injection molding are known in the art and, for example, in the "Injection Molding Manual", Friedrich Johannnab er / Walter Michaeli, Munich; Vienna: Hanser, 2001, ISBN 3-446-15632-1 or "instructions for the construction of injection molds," Menges / Michaeli / Mohren, Munich; Vienna: Hanser, 1999, ISBN 3-446-21258-2 described. Extrusion processes are known to the person skilled in the art and are described, for example, for coextrusion in, inter alia, EP-A 0 110 221, EP-A 0 110 238 and EP-A 0 716 919. For details of the adapter and nozzle process see Johannaber / Ast: "Kunststoff- Maschinenführer ", Hanser Verlag, 2000 and in Kunststoff Kunststoff:" Coextruded Films and Sheets: Future Perspectives, Requirements, Equipment and Production, Quality Assurance ", VDI-Verlag, 1990.

According to the invention products are glazings, for example, for architectural glazing, windows of rail and aircraft, safety glass, roofing or other building glazings.

FIG. 1 shows a construction of an insulating glass unit according to the invention

The reference numerals in Figure 1 mean: A: glass pane a: gas filling

B: polycarbonate containing nanoscale inorganic filler C: glass D: sealing

Examples

In the following, the invention will be described in more detail by means of exemplary embodiments, wherein the determination methods described here for all corresponding quantities are used in the present invention, unless otherwise described.

Light transmission (Ty):

The transmission measurements were carried out on a Lambda 900 spectrophotometer from Perkin Elmer with a photometer sphere according to ISO 13468-2 (ie determination of the total transmission by measuring the diffuse transmission and direct transmission). The color in transmission is determined using a Lambda 900 spectrophotometer from Perkin Elmer with photometer ball based on ASTM El 348 with the weighting factors and formulas described in ASTM E308.

Determination of the TDS value (Tds, Solar Direct Transmittance): The transmission measurements were carried out on a Lambda 900 spectrophotometer from Perkin Elmer with a photometer ball. All values were determined at wavelengths from 320 nm up to and including 2300 nm with Δλ 5 nm.

The calculation of the "Solar Direct Transmittance" TDS was performed according to ISO 13837, computational Convention "A".

Used material:

Polycarbonate: linear bisphenol-A-polycarbonate with end groups based on phenol having a melt volume rate (MVR) of 9.5 cm ^3/10 min, measured at 300 ° C and 1 as the polymer component, 2 kg load according to ISO 1033 containing 0 , 08 wt .-% YMDS 874 (cesium tungstate (Cso, 33W03) dispersion from Sumitomo Metal Mining, Japan, wherein the solids content of cesium tungstate in the acrylate dispersion is 25 wt .-%), 0.025 wt .-% Irganox B900 (mixture 80% Irgafos 168 and 20% Irganox 1076; BASF AG; Ludwigshafen), 0.01% of triphenylphosphine (Sigma-Aldrich, 82018 Taufkirchen, Germany) and 0.20% by weight of> Tinuvin 329 (2- (benzotriazol-2-yl) -4- (2,4,4-trimethylpentane -2-yl) phenol / CAS No. 3147-75-9 from BASF AG, Ludwigshafen) and 0.25% by weight of> pentaerythritol tetrastearate (Cognis Oleochemicals GmbH Dusseldorf). Glass: 4mm thick partially tempered soda-lime glass called TVG Optifloat blank from the company Flachglas Wernberg GmbH hereafter called window pane.

Spacer system: Aluminum spacer filled with desiccant

Primary sealant: Naftotherm BU-S (solvent-free polyisobutylene) manufactured by Kömmerling Chemical Factories GmbH Secondary sealant: Naftotherm M82 (solvent-free polysulfide, two-component) manufactured by Kömmerling Chemische Fabriken GmbH

Polycarbonate sheet production: Polycarbonate sheet Polycarbonate sheet is produced by injection molding. 150 x 105 x 4 mm injection molded rectangular panels with optical quality side gates are made using the above-identified polycarbonate. The melt temperature was 300 - 330 ° C and the mold temperature 1 00 ° C. The granules were dried before processing for 5 hours in a vacuum oven at 120 ° C.

weathering:

The insulation elements mentioned below are weathered in a climatic chamber at 90 ° C and 90% relative humidity. The optical data are determined after 250 h and 500 h. Example 1 Comparative Example

IGU ordered from an outer 4 mm thick polycarbonate sheet A, located at a distance of 6mm inner 4mm thick glass B and another at a distance of 6mm to the inner glass pane lying further 4mm thick glass B sealed with a combination of spacer and primary sealant. The space between the discs is flooded with argon and the disc is then sealed with the secondary sealant. After the edge has dried thoroughly, the outer frame of the IGU is sealed with a one-sided metal strip called S53L10M from Stokvis Tapes Deutschland GmbH. In addition, the edge areas of the IGUs already bonded to the single-sided adhesive metal strip called S53L10M from Stokvis Tapes Deutschland GmbH were sealed with a single-sided adhesive polyimide adhesive tape named 92-3033 from 3M from Neuss. As a result, the permeation of moisture was completely prevented by the edge bond.

EXAMPLE 2 (Comparative Example) IGU consisting of an outer 4 mm thick glass pane B, an inner 4 mm thick polycarbonate pane A at a distance of 6 mm and a further 4 mm thick glass pane B spaced at a distance of 6 mm from the inner polycarbonate pane and sealed with a combination of spacer and primary sealant. The space between the discs is flooded with argon and the disc is then sealed with the sealing material (secondary sealant). The frame is not additionally sealed.

Example 3 (inventive example)

IGU consisting of an outer 4mm thick glass pane B, an inner 4mm thick polycarbonate pane A at a distance of 6mm and another 4mm thick glass pane B spaced 6mm from the inner polycarbonate pane sealed with a combination of spacer and primary sealant. The space between the discs is flooded with argon and the disc is then sealed with the secondary sealant. Once the edge seal has dried, the outer frame of the IGU is sealed with a one-sided adhesive metal strip called S53L10M from Stokvis Tapes Deutschland GmbH. In addition, those already with the one-sided adhesive metal band called S53L10M the company Stokvis Tapes Germany GmbH bonded edge portions of the IGUs sealed with a single-sided adhesive polyimide adhesive tape called 92-3033 3M from Neuss. As a result, the permeation of moisture was completely prevented by the edge bond.

Table 1: Optical data before and after weathering:

The output data before weathering for the optical properties are identical in all constructions within the scope of measurement accuracy. After 250 h of weathering, the Tds value in Comparative Example 1 and in Example 3 according to the invention increases. However, surprisingly, the increase in the Tds value in Inventive Example 3 is significantly lower. Thus, the IR protective effect after weathering in Example 3 of the invention is higher. From Comparative Example 1 and Example 3 according to the invention, it can thus be seen that, surprisingly, the arrangement of the disks is important for the heat-protection properties. After 500 hours, hardly any increase in the Tds value of the structure according to the invention is observed. In contrast, the IR protective effect in the IGU according to Example 1 continues to decrease. Further, the comparison of Examples 2 and 3 shows that insufficient sealing of the IGU results in less long-term stability in terms of antifouling properties.

Claims

claims

Triple element containing in the following order

A) a first glass pane,

B) another disc containing or consisting of polycarbonate and

C) another glass pane, characterized in that a filling gas is present between the individual panes, preferably air, Ar, Kr, Xe, He, SFe, CO2, and that the polycarbonate contains at least one nanoscale inorganic pigment.

2.) triple element according to claim 1, characterized in that the nanoscale inorganic pigment has an average particle diameter smaller than 200 nm

3.) triple element according to claim 1 or 2, characterized in that the polycarbonate contains a nanoscale pigment on Wolframatbasis.

4.) triple element according to one of claims 1 to 3, characterized in that at least one of the discs A), B) or C) is additionally coated.

5.) triple element according to one of claims 1 to 4, characterized in that the filling gas is air, argon or krypton.

6.) triple element according to claim 5, characterized in that the filling gas is argon or krypton.

7.) triple element according to one of claims 1 to 6, characterized in that the distance of the discs of 6mm to 12mm, and the thickness of the polycarbonate disc is 2mm to 15mm.

8.) Triple element according to one of claims 3 to 7, characterized in that the concentration of tungstate based on the solids content is 0.0001 wt .-% - 10.0000 wt .-% in the total polymer composition.

9.) triple element according to claim 8, characterized in that the concentration of tungstate based on the solids content, 0.0001 wt .-% - 0.0500 wt .-% in the total polymer composition.

10.) triple element according to one of claims 3 to 9, characterized in that the middle

Polycarbonate disc cesium tungstate or zinc-doped cesium tungstate contains.

11.) triple element according to one of claims 1 to 10, characterized in that the

Polycarbonate contains at least one UV absorber based on benzotriazoles, triazines and biphenyltriazines and at least one Entfomungsmittel.

12.) triple element according to one of claims 1 to 11, characterized in that the middle

Disc B) is a multi-layer system consisting of an overlying UV protective layer and an underlying polycarbonate substrate layer.

13.) triple element according to one of claims 1 to 12, characterized in that the

Polycarbonate contains triphenylphosphine.

14.) Use of a Dreifachelements according to any one of claims 1 to 13 for glazing,

Architectural glazing, windows of rail and air vehicles, safety windows, roofs or other building glazings.