Name of resin (English)

Cyclo Olefin Polymer

Name of resin (Japanese)

Cyclic (cyclo) olefin polymer

Application example

Optical lens, pickup lens, light guide plate, syringe etc.

Feature

High transparency, low water absorption, low specific gravity

Dryer Points to note on selection

There is almost no hygroscopicity (100 ppm), but due to oxygen dissolved in the inside of the pellet, oxidation yellowing, screw burn, etc. occur at the time of melting. Oxygen is desorbed by heating to the drying temperature, but again in the atmospheric environment, it re-adsorbs with the temperature decrease, so treatment in a nitrogen atmosphere or vacuumization is suitable. Depending on product quality, use nitrogen purge or nitrogen substitution drying etc. properly.

Formable moisture ppm

≦ 300 to 100 ppm