Optical properties of adhesive base materials
"Hydroxyl terminated liquid Poly olefin™" is a liquid polyolefin with a highly reactive hydroxyl group at the end EPOL™ the molecule, obtained by hydrogenating * "Hydroxyl terminated liquid Poly isoprene™".
Because almost no double bonds remain in the molecule, it has high transparency and yellowing resistance, and is resistant to discoloration due to heat or ultraviolet rays.
It also has low moisture permeability and tackifying properties, making it widely used in optical applications. It is also used as an optical transparent adhesive (OCA, OCR) for electronic devices such as smartphones, and as an ultraviolet (UV) curing resin compounding agent.
*Hydrogenation: A reduction reaction that adds hydrogen to unsaturated bonds in molecules.
Transmittance at each wavelength
|
R-45HT series cured product |
R-15HT series cured product |
Hydroxyl terminated liquid Poly isoprene™ series cured product |
Hydroxyl terminated liquid Poly olefin™ series cured product |
|
|---|---|---|---|---|
| 589nm(D) | 1.514 | 1.513 | 1.517 | 1.476 |
| 486nm(F) | 1.524 | 1.522 | 1.526 | 1.482 |
| 656nm(C) | 1.511 | 1.509 | 1.514 | 1.474 |
| Abbe number | 39.6 | 39.7 | 40.7 | 58.1 |
| Total light transmittance (%) | 89 | 87 | 87 | 90 |
| Yellow Index | 8.3 | 13.8 | 9.0 | 1.9 |
*Each cured product uses isophorone diisocyanate as a curing agent.
Mixing conditions: [NCO]/[OH]=1.05
Curing conditions: Press 120℃ x 1 hour + Post curing 70℃ x 15 hours