Unitika has succeeded in using non-metal catalysts for polymerising polyester. The company’s technology enables mass production of polyester resins with the use of non-metal catalysts. It is the world’s first achievement. Non-metal catalysts are conventionally regarded as substances that are less active, since they do not have polymerisable and physical properties equal to those of metal catalysts. For this reason, metal catalysts such as antimony, germanium, aluminum, and titanium are normally used for polymerising polyester. Polyester resins made from metal catalysts and non-metal catalysts are similar in colour tone, and molecular quantity during melt processing. Polyester resins made from non-metal catalysts are transparent, whereas those made from metal catalysts can tarnish.

JCFA News Letter (No.25) August, 2024/Japan Chemical Fibers Association