High Refractive Index / Low Refractive Index Resins
High Refractive Index / Low Refractive Index Resins

NTT-AT provides detailed solutions that meet customers' needs for various types of optical adhesive.

Features

High Transparency of NTT-AT's resin coated substrate

With the refractive index of 1.5 in normal resins, the problem of a high reflection loss arose in cases of adhesion with high refractive index glass and crystal materials.

Recently, resins with refractive indices of 1.7 or more, 1.4 or less and high refractive index, low refractive index resins, which are also excellent in transparency in visible light domains have been developed. As well as being adhesives for high refractive index glass and crystal materials, since they excel in transparency while also having a high refractive index, it is expected that they can be used as a coating agent for displays and similar products. Moreover, to match the particular working environment of our customers, we have prepared both ultraviolet curing and heat curing types.

(Photo: Dispersion of nanoparticles brought the combination of high refractive index and transparency into reality)

 

High Refractive Index / Low Refractive Index Resins Inquiry

Specifications / Details

3 Features of Refractive Index Control Resins (High Refractive Index / Low Refractive Index Types)

  • A refractive index of either 1.4 or less, or 1.7 or more can be chosen
  • Either the ultraviolet curing or heat curing hardening method can be chosen
  • High transparency in visible light domains

Characteristics Charts for Refractive Index Control Resins (High and Low Index Types)

Optical Transmittance
Optical Transmittance
Refractive Index Wavelength Dispersion
Refractive Index Wavelength Dispersion

Application Examples for Refractive Index Control Resins (High and Low Index Types)

  • High and Low Refractive Index Coating Agents
  • Adhesives for High and Low Refractive Index Crystal Materials
  • Adhesives for High and Low Refractive Index Glass (for camera lenses, eyeglass lenses, etc.)
  • Higher Efficiency Optical Input and Output Power
  • Efficient Conversion of Light Energy

Refractive Index Control Resins Specifications (High Index Types)

Item
 
Test Conditions Unit Acryl Epoxy
#18165 #6205 *1 E3754 #7200
Curing Condition
Intensity [365nm] mW/cm² 10 100 100 100
Time min 5 5 5 10
After curing Refractive Index (nD) Abbe refractometers
at 25°C
- 1.675 1.720 1.603 1.627
Glass Transition Temperature [Tg] Dynamic Viscoelasticity
at the temp. of tanσmax
°C 113 68 73 63
Optical Transmittance
(50um thickness)
λ=450nm % 94 72 *2 92 78
λ=540nm 96 78 *2 96 88
λ=630nm 96 81 *2 96 92
Bond Sterngth Glass / Glass kgf/cm2 >48 35 >280 55

*1 : Tends to crystallize at low temperatures.

*2  : Thickness 90 μm

Refractive Index Control Resins Specifications (Low Index Types)

Item
 
Test Conditions Unit Acryl Epoxy
#18204 #18114 E3810
Curing Condition
Intensity [365nm] mW/cm² 10 10 100
Time min 1 5 10
After curing Refractive Index (nD) Abbe refractometers
at 25°C
- 1.375 1.400 1.438
Glass Transition Temperature [Tg] Dynamic Viscoelasticity
at the temp. of tanσmax
°C 18 94 103
Optical Transmittance
(Thickness 1mm)
λ=450nm % 89 92 76
λ=540nm 91 94 86
λ=630nm 91 94 89
Bond Sterngth Glass / Glass kgf/cm2 27 26 >61
The characteristic values shown in this table are sample measured values, and do not constitute guaranteed performance values.

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