Photo chromic pigment




- Photo chromic pigment is suitable for several application such as extrusion, injection, PP, PE.

- PVC, K-resin, epoxy, printing, labeling etc.

- Photo chromic pigment can be processing to masterbatch in order to keep uniform colors. 





• introduction

▶ Photo chromic pigment
- Photo chromic pigment changes its color by sun light (ultraviolet rays). This is organic compound that its color changes when it is exposed to sun light (ultraviolet rays), and returns original color by heat or other waves.


- As the above picture, the color appears in hv1 ultraviolet rays and returns its original color by heat or visible ray (hv2). It has superior durability and light stability.

▶ The molecular structure of photo chromic pigment is as follows.


● Heat - Resisting & Solubility


▶ Solubility in Organic Solvents (at 25° C, % w/w)


▶ Heat Resistance of photo chromic pigment



● colors




• The characteristics of photo chromic pigment


- Photo chromic is not observed on products in the crystalline state and its color changes when smelted in plastic or solvent.

- Photo chromic Blue Violet Yellow and Red colors can be degraded by acids or strong oxidizing agents (e.g. peroxides). Compatibility with this kind of chemicals must be tested in advance. 

- The UV absorber can hinder the photo chromic effect

- The photo chromic response depends on the characteristics of the host medium (polarity. T g etc.), and technique used in preparation of the specimen (melt processing, casting, thermal transfer etc.)

- Photo chromic pigment can be mixed together to obtain the desired color in the activated state. It can be also mixed with ordinary pigments.




● Application for Epoxy