APEL

APEL is a transparent resin material that achieves both high refractive index and low birefringence. APEL is a cycloolefin copolymer (COC) developed by Mitsui Chemicals Inc. based on Ziegler polymerization technology. It combines the performance of polyolefin resin and amorphous resin, and its heat resistance and fluidity can be controlled.

Main Features

APELMitsui Chemicals' APEL is a transparent resin material that can achieve both high refractive index and low birefringence. APEL is a cycloolefin copolymer (cycloolefin copolymer, COC) developed by Mitsui Chemicals Inc. based on Ziegler polymerization technology. It combines the performance of polyolefin resin and amorphous resin, and its heat resistance and fluidity can be controlled. In addition, it has the highest refractive index among amorphous polyolefins, as well as low optical anisotropy, and is a material with very low birefringence. APEL has achieved fruitful results in its use as an optical plastic lens. At the same time, it is also used in medical packaging materials due to its superior moisture resistance, chemical resistance, and non-absorption. The diverse functions and excellent properties of APEL have opened up new application potentials for transparent materials.

Comparison of basic physical properties of main optical materials

Optical Grade Lineup

Optical Grade Physical Properties Table

optical properties

Transparent grade APEL is amorphous, so it has excellent optical properties. APEL is colorless and transparent, with a light transmittance of 91% and a haze of 4%, while the birefringence is very low, and its complex refractive index is less than 20nm, which is almost the same as PMMA.

Green specification

black specification

low stress properties

High refractive index with low dispersion (low Abbe number)

low water absorption

APEL has extremely low water absorption and dimensional change due to water absorption, and is especially suitable for optical applications that require high dimensional stability.

Moisture resistance

The coefficient of moisture vapor permeability (CWVP) of APEL is the lowest among all available transparent resins. Therefore, APEL is most suitable for the application of moisture-resistant containers and films.

Low dielectric properties

APEL has the characteristics of low dielectric loss and low dielectric constant.

Rigid at high temperature

The flexural modulus of APEL is slightly affected by temperature, and it can still maintain high rigidity at high temperatures.

Dimensional stability

APEL has excellent dimensional stability, and its mold shrinkage rate is low, and its linear expansion coefficient is also low.

application

Optical Application Examples

APEL can provide special specifications for plastic lenses and optical components such as cameras, AR/VR wearable devices, projectors, read-write heads (Camera, Wearable AR/VR, Projector, Pick-up Lens).

The required characteristics of mobile phone camera lens parts:

*High transmittance

*Maintenance of luminance and high color reproducibility

* High mobility

*Easy for thin injection molding

*Excellent transferability of fine structure

*Low complex refraction, no rainbow pattern

*suitable for polarized use

*Small distortion

Optical parts require characteristics:

* Thinning

*high brightness

*High refinement

* High durability is suitable for making light guide plate, grating plate, front panel, head-up display

Medical Application Examples

APEL not only has excellent moisture resistance and chemical resistance, but also because it can be sterilized by gamma rays and high-pressure steam, it is suitable for packaging containers for medical purposes.

*PTP packaged sheet

*pill bottle

*Pre-filled syringe

*Cosmetics and inspection containers

*wrap

*Easy-tear film for packaging

*shrink film

characteristic

The packaging is not easy to age and can store medicines for a long time

* Low precipitation, little impact on medicines

* Has low moisture permeability

* Has high barrier properties

Chemical Resistance

APEL has good chemical resistance and excellent resistance to water vapor, acid, alkali and polar solvents.

Physical Properties of Packaging Grades

Formability

APEL has excellent melt fluidity and formability, and its formability is better than other heat-resistant amorphous polymers. APEL can be processed by injection molding, injection blow molding, extrusion, and vacuum forming.

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