Polyimide for Buffer Coatings and Interlayer Dialectric
Polyimide is known as a polymer of imide monomers. It is abbreviated as PI, and has been produced massively since 1955. Polyimides are applied in many ways for harsh organic materials such as displays (gadget screens), military tools, and other semiconductors because of their high heat-resistance. Polyimide formulations contain solvent. Instead of adhesive glue joints, polyimides are better for large surface areas. The flame resistance of polyimides make them chosen more often than other similar glue coatings. This makes polyimides safer and more accepted in trading because trade forbids flame retardants strictly. Antimony compounds and red phosphorous structures are not found in polyimides.
Polyimide coatings have sufficient adhesion to the primary surface, judging from an abrasion test. They are slightly stronger than epoxy glue joint. They are applied in many industries that produce things we use daily. For example, Polyimide is used as a coating for the image sensor in such gadgets as a digital camera and cellular phone. It has high transparency and controlled refractive index. It minimises the light loss to reach photodiode. Applications of Polyimide Coatings are also including wire covering, buffer coating, Re-Distribution Layer(RDL) or dialectic layer, and display (gadget screens).
Japan is Asia’s number one polyimides producer. One of the manufacturers creates an aromatic polyimide pioneer solution as the result of their extensive experience in polymerization and application technologies for both polyimides and photosensitive polymers. This high-heat and crack resistant polyimide coatings have excellent film elongation that avoids cracks against bending. Their excellent adhesive strength with various base materials can be achieved by adequate surface treatments. They barely reduce weight at high temperature that enables high heat resistance whose level is equal to non-photosensitive polyimides. They also have high electrical insulation and wide production line, which offers both positive and negative working types.