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DEFENSA OP Series Low Refractive Index UV-curable Resins

DEFENSA OP Series is a UV-curable resin for various optical applications that combines a low refractive index (1.38 to 1.47) and transparency. These resins can be adjusted to the desired viscosity between 20 and 2000 mPa·s(25°C) without using a diluting solvent and without changing its optical, thermal, and mechanical characteristics, so custom grades suited to various applications and processing methods can also be supplied.

Features

  • Low refractive index: 1.38 to 1.47 (at 589 nm/25°C)
  • High transparency
  • Optionally adjustable viscosity without changing its optical, thermal or mechanical properties (20 to 2000 mPa·s/25°C)
  • Solvent-free (active ingredient 100%)

Applications

  • Optical fibers (cladding materials)
  • Optical adhesives
  • Optical lens
  • Surface coating material for various optical components

Properties List

DEFENSA   (Unit) (Temperature Conditions) OP-3801 OP-4003 OP-4004 OP-4002
Before UV curing Standard viscosity mPa·s 25°C 2000 2000 2000 70
Refractive index 589nm 25°C 1.355 1.377 1.377 1.377
Specific gravity - 25°C 1.51 1.41 1.41 1.41
After UV curing Refractive index 589nm 25°C 1.378 1.403 1.403 1.403
Transparency* 850nm r.t. 94.4 94.0 93.6 93.6
1310nm r.t. 94.6 94.1 94.2 94.2
1550nm r.t. 94.2 93.5 94.0 94.0
Physical properties Specific gravity - 25°C 1.62 1.55 1.56 1.56
Cure shrinkage % - 7.3 9.8 10.6 10.6
Thermal and mechanical properties Decomposition temperature °C - 281 286 264 264
Linear expansion coefficient 10-6/°C -40°C 149 125 127 127
10-6/°C 40°C 334 227 226 226
10-6/°C 140°C 341 278 282 282
E' 107 Pa -10°C 37.4 88.1 79.4 79.4
E' 107 Pa 140°C 0.2
3.1 2.6 2.6
Tg °C - 22 52 50 50
Shore hardness (D) - r.t. 12 66 64 64
  • UV curing conditions: under air shutoff atmosphere, using a metal halide lamp of 20 kJ/m2
  • * Measured using 1-millimeter-thick film (the value includes approx, 5% reduction in transparency after reflection at both sides of the film)
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