Low refractive index resin

NTT-AT provides low refractive index resins with a refractive index of 1.4 or less based on refractive index control technology and loss reduction technology, which are the base technologies for optical communication adhesives.
Low refractive index and excellent transparency.
It is expected to be applied to the optical recording field, the display field, the optical energy utilization field, etc.

Features

1. high transparency
   ​High transmittance of 90% or more at 1mm thickness
2. Customizing Refractive Index
   Tunable to a low refractive index of 1.4 or less
3. Precision refractive index adjustment
   Highly accurate refractive index adjustment of ±0.005 is possible

Characteristic

item		conditions	unit	Acrylate *		epoxy
				#18204	#18114	E3810
Curing conditions		UV intensity	mW/ cm2	10	10	10
		irradiation time	min	1	5	10
Properties after curing	refractive index	589 nm	-	1.375	1.400	1.438
	Glass-transition temperature	Dynamic viscoelasticity: temperature at tan δ max​	℃	18	94	103
	hardness	Shore Hardness Tester: 25℃	-	D20 A85	D72	D78
	light transmittance	450 nm	%	89	92	76
		540nm		91	94	86
		630 nm		91	94	89
	shear bond strength	glass/glass	kgf/ cm2	27	26	>61

*Acrylate low refractive index resin #18204 and #18114 are scheduled to be discontinued by the end of March 2024. If you have any questions, please contact us.

The characteristic values in the table are sample measurement values, not guaranteed values.