# US 11,440,382 B2 · Transparent multilayer structure for thermal management

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- Number: US 11,440,382 B2
- Document ID: US11440382B2
- Status: Granted
- Kind: B2
- Application number: 16/461,417
- Filed: 2017-11-16
- Published: 2019-11-14
- Granted: 2022-09-13
- Earliest claimed: 2016-11-17
- Assignees: Covestro Deutschland AG
- Applicants: Covestro Deutschland AG
- Inventors: Alexander Meyer; Rafael Oser; Dirk Hinzmann; Timo Kuhlmann
- Web page: https://patentgrep.com/patent/US11440382B2

## CPC

- B32B 1/00: Layered products having a non-planar shape
- B60J 3/007: {Sunglare reduction by coatings, interposed foils in laminar windows, or permanent screens (layered glass products B32B17/00; process of coating windows C03C17/00)}
- B32B 7/027: Thermal properties
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 15/08: of synthetic resin
- B32B 15/082: comprising vinyl resins; comprising acrylic resins
- B32B 15/085: comprising polyolefins
- B32B 15/09: comprising polyesters
- B32B 15/095: comprising polyurethanes
- B32B 15/18: comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)}
- B32B 15/20: comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)}
- B32B 27/08: of synthetic resin
- B32B 27/18: characterised by the use of special additives
- B32B 27/20: using fillers, pigments, thixotroping agents
- B32B 27/30: comprising vinyl {(co)polymers; comprising acrylic (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/365: {comprising polycarbonates}
- B32B 27/40: comprising polyurethanes
- B60J 1/00: Windows; Windscreens; Accessories therefor (B60J10/00 takes precedence; air curtains instead of windows B60J9/04 {; sealing strips for windshields B60J10/70; sealing sash guides for sliding window panes B60J10/74; glass partitions inside vehicles to protect occupants against personal attack B60R21/12})
- B32B 2250/04: 4 layers
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/205: Metallic coating
- B32B 2255/24: Organic non-macromolecular coating
- B32B 2255/26: Polymeric coating
- B32B 2264/10: Inorganic particles
- B32B 2307/30: having particular thermal properties
- B32B 2307/412: Transparent
- B32B 2307/584: Scratch resistance
- B32B 2307/718: Weight, e.g. weight per square meter
- B32B 2605/006: Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
- B60J 1/002: {with means for clear vision, e.g. anti-frost or defog panes, rain shields (window heating in H05B3/84, H05B3/86)}
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B60J: WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES (fastening, suspending, closing, or opening of such devices E05)

## Abstract

The invention relates to transparent multilayer structures and glazings or glazing elements comprising said multilayer structures, which are suitable for screening an indoor space from a radiation source, comprising, in this order a) optionally a protective layer a, b) a substrate layer based on a thermoplastic polymer, especially an aromatic polycarbonate, having a luminous transmittance in the range of 380 to 780 nm of at least 0.3%, determined at a layer thickness of 4 mm according to DIN ISO 13468-2:2006 (D65, 10°), and a TDS value of less than 40%, determined according to ISO 13837:2008 at a layer thickness of 4 mm, the substrate layer containing at least 0.001 wt. % of an IR absorber different from carbon black, c) if necessary, another layer c based on a thermoplastic polymer with a maximum thickness of 600 μm, d) at least one metal layer d, containing at least one element selected from the group including Ag, Al, Au, Pt, Fe, Cr, Sn, In, Ti, Pd, Nb, Cu, V or their alloys, the sum of thicknesses of all metal layers being 1 nm to not more than 30 nm, and e) optionally a protective layer e, at least 60% of the substrate layer b being covered by metal layer d, the layers following layer d, including the protective layer e, when added up, having a thickness of not more than 100 nm and the metal layer being applied to the side of the substrate layer b designed to be on the face of the multilayer structure facing away from the radiation source.

## Claims

### Claim 1

A transparent multilayer article suitable for shielding a three-dimensional volume from a radiation source, comprising, in this sequence,
a) optionally a protective layer a,
b) a substrate layer b based on a thermoplastic polymer having light transmittance in the range from 380 to 780 nm of at least 3.0% determined at a layer thickness of 4 mm according to DIN ISO 13468-2:2006 (D65, 10°) and
a direct solar transmittance TDS value of less than 40%, determined according to ISO 13837:2008 at a layer thickness of 4 mm, where the substrate layer contains at least 0.001% by weight of an IR absorber other than carbon black,
c) optionally a further layer c based on a thermoplastic polymer having a maximum thickness of 600 μm,
d) at least one metal layer d comprising at least one element selected from Ag, Al, Au, Pt, Fe, Cr, Sn, In, Ti, Pd, Nb, Cu, V or alloys thereof where the sum total of the thicknesses of all metal layers is 1 nm to a maximum of 30 nm, and
e) optionally a protective layer e,
wherein at least 60% of the substrate layer b is covered by metal layer d,
the layers that follow on from layer d, including protective layer e, have a total thickness of not more than 100 nm
and the metal layer is disposed on the side of the substrate layer b intended to lie on the side of the multilayer article facing away from the radiation source.

### Claim 2 (depends on 1)

The multilayer article as claimed in claim 1, wherein the TDS value of the substrate layer b is less than 30%, determined according to ISO 13837:2008 at a layer thickness of 4 mm.

### Claim 3 (depends on 1)

The multilayer article as claimed in claim 1, wherein the IR absorber is selected from borides and/or tungstates.

### Claim 4 (depends on 1)

The multilayer article as claimed in claim 1, wherein the substrate layer b contains 0.003% to 0.009% by weight of IR absorbers other than carbon black.

### Claim 5 (depends on 1)

The multilayer article as claimed in claim 1, wherein the substrate layer b contains 0.004% to 0.008% by weight of lanthanum hexaboride as IR absorber.

### Claim 6 (depends on 1)

The multilayer article as claimed in claim 1, wherein the thermoplastic polymer in the substrate layer b is aromatic polycarbonate.

### Claim 7 (depends on 1)

The multilayer article as claimed in claim 1, wherein the substrate layer contains up to 0.003% by weight of carbon black.

### Claim 8 (depends on 1)

The multilayer article as claimed in claim 1, wherein the multilayer article has a three-dimensionally shaped surface.

### Claim 9 (depends on 1)

The multilayer article as claimed in claim 1, wherein the multilayer article, apart from adhesive layers including any carrier films, does not comprise any further layers between layers b to d for bonding of the individual layers and/or any (semi)metal nitride layers and/or (semi)metal oxide layers.

### Claim 10 (depends on 1)

The multilayer article as claimed in claim 1, wherein the three-dimensional volume to be shielded is a motor vehicle interior, the multilayer article is a bodywork part or part of a bodywork part and the radiation source is the sun.

### Claim 11 (depends on 1)

The multilayer article as claimed in claim 1, wherein the multilayer article comprises the following layers:
Layer a) a scratch-resistant coating based on polysiloxane, and optionally a primer layer which is disposed atop the substrate layer b and acts as an adhesion promoter between the scratch-resistant coating based on polysiloxane and the substrate layer b, and
Layer b) a substrate layer b based on aromatic polycarbonate, having light transmittance in the range from 380 to 780 nm of at least 3.0% determined at a layer thickness of 4 mm according to DIN ISO 13468-2:2006 (D65, 10°) and
a TDS value of less than 40%, determined according to ISO 13837:2008 at a layer thickness of 4 mm,
where the substrate layer contains at least 0.001% by weight of an IR absorber other than carbon black, and
Layer d′) at least one metal layer d comprising at least one element selected from Ag, Al, Au, Cu or alloys thereof where the sum total of the thicknesses of all metal layers is 5 nm to 20 nm, or
Layer d″) a metal layer system consisting of
i) one or more metal layers, selected from the group of the Ag, Au and Cu layers and mixtures thereof, where the sum total of the thicknesses of the metal layers is 5 to 20 nm, and
ii) optically active antireflection layers of metal oxide applied to either side of the metal layer(s), the thickness of each of which is 5 to 80 nm.

### Claim 12 (depends on 11)

The multilayer article as claimed in claim 11, wherein the multilayer article comprises an adhesive layer between layer band layer d′/d″ and
Layer c) a layer c based on a thermoplastic polymer, having a maximum thickness of 600 μm.

### Claim 13 (depends on 11)

The multilayer article as claimed in claim 11, wherein the multilayer article does not comprise any further layers.

### Claim 14 (depends on 1)

A glazing or a glazing element comprising a multilayer article as claimed in claim 1.

### Claim 15 (depends on 14)

The glazing as claimed in claim 14, wherein the glazing is a roof module having a black edge alongside the multilayer article.