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Polyimide (PI) purification

The polyimide (PI), as a material frequently used for Liquid Crystal alignment, is formulated by the mixture of PI polymer and mixed solvent in a specific ratio. Due to the direct contact with the liquid crystal, it has an exceptionally high purity requirement.


During the production process of PI, approximately 30 to 50% of it will be contaminated with ions, moisture and particles. Although traditional purification technologies such as column purification and recrystallization can eliminate some contaminants, they will also change the formulation or even deteriorate the PI and render it non-reusable. 


Our Premium purification technologies are distinct from others in the industry is that we have found the solution to keep the general formula of the PI during the purification process, allowing the PI to have the exact same characteristic as the original solution.

Our premium liquid crystal purification technology applies to TN type, VA type, IPS type, and PSA type liquid crystals. In addition to having the ability to purify the PI in TN and VA categories in bulk PI used by the panel manufacturers, our technology also achieved outstanding outcomes in the purification of PI alignment agents in IPS and optical categories, which require a  considerably more challenging process and advanced technology. 


Meanwhile, we established a series of quality control policies to ensure the purified PI is indistinguishable from the original. We also work to increase the efficiency of restoring contaminated PI for reuse in new production.  


Our PI purification technology, which fulfils high-quality standards while significantly reducing production costs through reusing, has been verified by the application of Taiwanese panel manufacturers.

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