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Flexible materials for optical applications

A technology for flexible materials and applications, applied in the field of flexible materials, can solve problems such as unsuitable color effects and insufficient optical applications of polymer layers

Inactive Publication Date: 2009-08-05
威法格-多型控股公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0030] The quality of the interfacial layer that always exists between the porous or nanoporous layer and the polymer layer, and the homogeneity of the polymer layer is not good enough for optical applications
In recording sheets for inkjet printing, an overly sharp interface layer is disadvantageous due to unfavorable color effects

Method used

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  • Flexible materials for optical applications
  • Flexible materials for optical applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0141]A porous or nanoporous layer having a low refractive index and having a composition (in the dry state) as listed in Table 2 was coated on the underlying transparent polyester film 742, the polyester film is available from DuPont Teijin Films of Luxembourg.

[0142] Element Amount (g / m 2 ) Surface Modified SiO 2 6.000 Polyvinyl alcohol C 1.300 crosslinking agent 0.229

[0143] Table 2

[0144] Surface Modified SiO 2 It was prepared according to the method of example 1 of patent application EP 1'655'348.

[0145] Polyvinyl alcohol C is available as Mowiol 40-88 from Omya AG, Oftringen, Switzerland. The crosslinking agent is boric acid, which is available from Schweizerhall Chemie AG, Basel, Switzerland.

[0146] A non-porous layer having a high refractive index and consisting of polyvinyl alcohol B with a thickness of about 0.24 μm is applied onto this porous or nanoporous layer with a low refractive index.

[0147] Polyvinyl alco...

Embodiment 2

[0149] A porous or nanoporous layer having a low refractive index and having a composition (in dry state) as listed in Table 3 was coated on the transparent polyester film of Example 1 below.

[0150] Element Amount (g / m 2 ) Surface Modified SiO 2 21.052 Polyvinyl alcohol C 4.928 crosslinking agent 0.800

[0151] table 3

[0152] A non-porous layer with a high refractive index and a composition (in dry state) as listed in Table 4 was coated onto this porous or nanoporous layer with a low refractive index.

[0153] Element Amount (g / m 2 ) Polyvinyl alcohol D 0.070 latex 0.930

[0154] Table 4

[0155] Polyvinyl alcohol D is available as Gohsefimer K-210 from Nippon Synthetic Chemical Industry Ltd., Osaka, Japan. The latex was Jonrez E2001 available from MeadWestvaco Corporation, Stamford, USA.

[0156] The plies were sealed using a laminator GBC 3500 at a temperature of 120° C. at a speed of about 27 cm / min. ...

Embodiment 3

[0158] A porous or nanoporous layer having a low refractive index and having a composition (in dry state) as listed in Table 5 was coated onto the transparent polyester film of Example 1 below.

[0159] Element Amount (g / m 2 ) Lanthanum-containing alumina / hydroxide 20.250 lactic acid 0.369 Polyvinyl alcohol A 0.785 Polyvinyl alcohol B 1.830 crosslinking agent 0.021

[0160] table 5

[0161] Alumina / hydroxide was prepared according to the method of example 1 of patent application EP 0'967'086.

[0162] A non-porous layer with a high refractive index and a composition (in dry state) as listed in Table 6 was coated onto this porous or nanoporous layer with a low refractive index.

[0163] Element Amount (g / m 2 ) polyvinylpyrrolidone 0.500 crosslinking agent 0.250

[0164] Table 6

[0165] Polyvinylpyrrolidone is available from BASF AG, Switzerland, Available as Luviskol K90.

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Abstract

Disclosed is a flexible material for optical applications in a wavelength range of ramda1 to ramda2, ramda1 being smaller than ramda2. Said flexible material is composed of a flexible support and at least one multilayer that comprises a porous or nanoporous layer which has a low refractive index and contains inorganic nanoparticles and at least one binder, and a non-porous polymer layer which has a high refractive index and is in direct contact with the porous or nanoporous layer. The disclosed flexible material is characterized in that the maximum thicknesses of the boundary layers, in which the refractive index changes from one value to the other and which are located between the porous or nanoporous layers and the non-porous polymer layers that are in direct contact therewith, amount to 0.2 times wavelength ramda2. The difference in the refractive indices of the porous or nanoporous layers and the non-porous polymer layers is at least 0.20, 200 nm and 2500 nm being typical values for ramda1 and ramda2.

Description

technical field [0001] The invention relates to a flexible material for optical applications consisting of a flexible carrier and at least two thin layers in direct contact on said carrier. The refractive indices of the two layers differ by at least 0.20. One of these layers is porous or nanoporous and contains inorganic nanoparticles and the other is a non-porous polymer layer. Background technique [0002] A thin dielectric layer is a thin, usually transparent layer, which consists of different compounds and typically has a layer thickness in the micrometer or nanometer range. Thin layers of dielectrics are used in optical applications to modify the optical properties of surfaces and interfaces. At such interfaces, incident light is partially reflected, and partially transmitted and refracted. Diffractive and reflective behavior can be effectively influenced by a suitable choice of material and layer thickness. The thickness of the layer of interest is at λ 1 to lambd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/00
CPCG02B1/11G02B5/285G02B1/04
Inventor 罗伯特·贝尔吉尔贝特·古格勒马尔克·波沙尔斯特凡·许特尔
Owner 威法格-多型控股公司