WO2013184536A1 - Optical reflection films - Google Patents
Optical reflection films Download PDFInfo
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- WO2013184536A1 WO2013184536A1 PCT/US2013/043817 US2013043817W WO2013184536A1 WO 2013184536 A1 WO2013184536 A1 WO 2013184536A1 US 2013043817 W US2013043817 W US 2013043817W WO 2013184536 A1 WO2013184536 A1 WO 2013184536A1
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- WO
- WIPO (PCT)
- Prior art keywords
- acrylic
- film
- coating
- acrylic coating
- comprised
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Definitions
- Optical reflectors or optical reflection films have been widely used in LED- backlit units in liquid crystal displays (including handhelds, notebooks, desktop monitors and LCD TVs) and LED lighting fixture applications. Such optical reflectors or optical reflection films offer high optical reflectance in the visible wavelength region and excellent UV resistance.
- white optical reflectors have been made from metal (Ag, Al) deposited PET (polyethylene terephthalate) or white barium sulfate or CaC03 -pigmented polymer (such as PET, polycarbonate, polypropylene and polyethylene) films, which are not fully UV resistant.
- Films in accordance with the present invention may have one or more of the following advantages as compared to other materials known in the optical reflector or optical reflection film art: long-term UV resistance, excellent color retention (no yellowing), diffused light scattering, excellent thermal dimensional stability and/or heat resistance, excellent mechanical properties and environmental stability.
- the films of the present invention are capable of offering much better color retention and gloss retention than conventional optical reflectors made from extruded white PET,
- the substrate film layer component used in the present invention may be comprised of any suitable thermoplastic polymer such as, for example, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), PET-co-PEN, glycol-modified polyethylene terephthalate (PETG), PET-co-PETG, polycarbonate (PC), polymethyl methacrylate (PMMA), acrylonitrile-styrene-acrylate (ASA) copolymers, high-impact polystyrene (HIPS), acrylonitrile-butadiene-styrene (ABS) copolymers, polyolefins, and functional polyolefins.
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- PET-co-PEN glycol-modified polyethylene terephthalate
- PET-co-PETG glycol-modified polyethylene terephthalate
- PC polycarbonate
- PMMA polymethyl methacrylate
- ASA acrylonitrile
- the substrate film layer is in the form of a relatively thin, flat sheet or film of substantially uniform thickness.
- the thickness of the substrate film layer may, for example, be from 25 to 254 ⁇ or from 50 to 125 ⁇ .
- the substrate film layer may be a single unitary layer of a polymer or polymer blend or may contain two or more layers of different polymers or polymer blends.
- Suitable acrylic monomers include any of the polymerizable acrylate and
- the core may comprise from 30 to 85 percent by weight of the impact modifier and the outer shells may comprise from 15 to 70 weight percent of the impact modifier.
- the crosslinker in the elastomeric layer may range from 0 to 5.0% by weight.
- the matting agent content of the acrylic coating may be, for example, up to 20 weight % (e.g., 1 to 15 weight %). In one embodiment, an amount of matting agent is present in the acrylic coating which is effective to provide a surface gloss at a measuring angle of 60 degrees of less than 10 GU (e.g., 4-9 GU).
- the acrylic coating may be placed on one or both sides of the substrate film layer, with a primer coat optionally being present between the acrylic coating and the surface of the substrate film layer.
- a primer coat optionally being present between the acrylic coating and the surface of the substrate film layer.
- the acrylic coating is 20 ⁇ to 70 ⁇ or 30 ⁇ to 50 ⁇ in thickness.
- the acrylic coating is substantially uniform in thickness and extends over the entire surface of the substrate film layer.
- a suitable substrate film layer is selected and coated with a layer of the acrylic coating composition on at least one side.
- the surface to be coated may have first been primed. Coating may be carried out using any suitable method known in the art for coating polymeric film substrates, such as through the use of a bar coater, slot die, gravure, reverse gravure or the like. Generally, it will be desirable to apply a substantially uniform layer of the acrylic coating composition, typically having a thickness sufficient, when dried, to provide an acrylic coating layer of from 20 to 70 ⁇ in thickness.
- the coating of acrylic coating composition is then dried, by heating (e.g., at 50°C to 160°C) or other means, to remove the volatile liquid medium present. If both sides of the substrate film layer, each side may be coated and dried
- the white pigmented coating solution was applied to a clear primed PET (75 ⁇ , Melinex ® 454-300, supplied by DuPont.) substrate using a bar coating station.
- the coating layer was dried at 75°C for 5 minutes and 130°C for 2 minutes in a ventilation oven.
- the acrylic layer formed at the coating thickness of 50 ⁇ .
- the same coating solution was also applied to the backside of the acrylic coated sheet under the same conditions.
- the adhesion of acrylic layers to the primed PET was excellent.
- the thermal shrinkage was less than 0.8% at 150°C for 30 minutes along the MD and TD directions.
- the optical reflectance at 560 m was measured at 97.1%.
- the surface gloss at 60° was reduced to 12 GU.
- SH81 100 ⁇ , SKC Inc. PET film substrate using a bar coating station.
- the coating layer was dried at 75°C for 5 minutes and 125°C for 2 minutes in a ventilation oven.
- the acrylic layer formed over the sheet at a coating thickness of 50 ⁇ .
- the same coating solution was also applied to the backside of the double-sided acrylic coated sheet under the same conditions.
- the adhesion of the acrylic layers to the primed PET was excellent.
- the optical reflectance at 560 nm was measured at 97.1%.
- the surface gloss at 60° was reduced to 8-10 GU.
- the white pigmented coating solution was applied to a chromate Al panel substrate (0.64 mm thick A-412 Q-panel, from Q-Lab Corp.) on a bar coating station.
- the coating layer was dried at 70°C for 5 minutes and 124°C for 2 minutes.
- the acrylic-coated Al panel formed at a dry coating thickness of 70 ⁇ .
- the adhesion of acrylic layers to the chromate Al panel was excellent with the square retention of 100% using a standard X-hatch peel-off test.
- the optical reflectance at 560 nm was measured at 96.8%.
- the surface gloss at 60° setting was measured at 8 GU.
- the optical reflectance of the optical reflection film was measured in a reflection mode using Perkin Elmer Lambda 950 with a 150 mm integrating sphere.
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Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR112014030494-7A BR112014030494B1 (en) | 2012-06-05 | 2013-06-03 | OPTICAL REFLECTOR DEVICE AND METHOD OF MANUFACTURING A FILM OR SHEET SUITABLE FOR USE AS AN OPTICAL REFLECTOR |
EP13800796.8A EP2856016B1 (en) | 2012-06-05 | 2013-06-03 | Optical reflection films |
MX2014014923A MX2014014923A (en) | 2012-06-05 | 2013-06-03 | Optical reflection films. |
US14/403,646 US10584850B2 (en) | 2012-06-05 | 2013-06-03 | Optical reflection films |
CN201380029947.9A CN104641170B (en) | 2012-06-05 | 2013-06-03 | Optical reflectance coating |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US201261655553P | 2012-06-05 | 2012-06-05 | |
US61/655,553 | 2012-06-05 |
Publications (1)
Publication Number | Publication Date |
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WO2013184536A1 true WO2013184536A1 (en) | 2013-12-12 |
Family
ID=49712520
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2013/043817 WO2013184536A1 (en) | 2012-06-05 | 2013-06-03 | Optical reflection films |
Country Status (6)
Country | Link |
---|---|
US (1) | US10584850B2 (en) |
EP (1) | EP2856016B1 (en) |
CN (1) | CN104641170B (en) |
BR (1) | BR112014030494B1 (en) |
MX (1) | MX2014014923A (en) |
WO (1) | WO2013184536A1 (en) |
Cited By (2)
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CN103788805A (en) * | 2014-01-22 | 2014-05-14 | 南通市海鸥救生防护用品有限公司 | Coating material for retro-reflective film surface and preparation method thereof |
EP2875285A4 (en) * | 2012-07-23 | 2016-01-27 | Arkema France | Optical reflectors, reflection films and sheets |
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US20130225746A1 (en) * | 2012-02-24 | 2013-08-29 | E I Du Pont De Nemours And Company | Translucent white polymer composition and its use in glass laminates and other articles |
US11163132B2 (en) * | 2016-04-18 | 2021-11-02 | Canon Kabushiki Kaisha | Thermal barrier film, thermal barrier paint, and optical instrument |
JP7153657B2 (en) * | 2017-02-20 | 2022-10-14 | トリンセオ ユーロップ ゲーエムベーハー | A transparent film based on a resin component with a high glass transition temperature |
JP7061184B2 (en) * | 2018-03-23 | 2022-04-27 | 日華化学株式会社 | Light scatterer, composition for forming light scatterer, sheet-like laminate, projection screen, light diffusion sheet and lighting device with built-in light enhancer |
KR102659731B1 (en) * | 2018-09-20 | 2024-04-23 | 삼성디스플레이 주식회사 | Display device |
CN109942865B (en) * | 2019-03-29 | 2021-11-19 | 杭州瑞酷新材料有限公司 | Preparation method of radiation cooling film |
AU2021248605A1 (en) * | 2020-03-30 | 2022-10-20 | Basf Coatings Gmbh | Paints having enhanced reflectivity |
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- 2013-06-03 US US14/403,646 patent/US10584850B2/en active Active
- 2013-06-03 WO PCT/US2013/043817 patent/WO2013184536A1/en active Application Filing
- 2013-06-03 MX MX2014014923A patent/MX2014014923A/en unknown
- 2013-06-03 BR BR112014030494-7A patent/BR112014030494B1/en active IP Right Grant
- 2013-06-03 CN CN201380029947.9A patent/CN104641170B/en active Active
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CN103788805A (en) * | 2014-01-22 | 2014-05-14 | 南通市海鸥救生防护用品有限公司 | Coating material for retro-reflective film surface and preparation method thereof |
Also Published As
Publication number | Publication date |
---|---|
EP2856016A1 (en) | 2015-04-08 |
EP2856016A4 (en) | 2016-01-13 |
BR112014030494B1 (en) | 2021-08-10 |
BR112014030494A2 (en) | 2021-05-18 |
CN104641170B (en) | 2017-10-27 |
CN104641170A (en) | 2015-05-20 |
MX2014014923A (en) | 2015-06-17 |
US20150103513A1 (en) | 2015-04-16 |
EP2856016B1 (en) | 2022-06-01 |
US10584850B2 (en) | 2020-03-10 |
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