Abstract: Present invention is related to a polyimide of formula as following: and a ketone-containing alicyclic dianhydride of formula as following: wherein: R1, R2, R3, R4 denote hydrogen atom or carbon containing functional group with carbon number at a range of 1-4; R5 denotes diamine group; and n equals to any positive integer.

Abstract: Present invention is related to a polyimide of formula as following: and a ketone-containing alicyclic dianhydride of formula as following: wherein: R1, R2, R3, R4 denote hydrogen atom or carbon containing functional group with carbon number at a range of 1-4; R5 denotes diamine group; and n equals to any positive integer.

Abstract: Disclosed is a polyester-imide prepared from a condensation polymerization of aromatic diacid, diimide diacid, and diol, having a carboxy to hydroxy equivalent molar ratio of 0.9:1 to 1.1:1. The disclosed polyester-imide has outstanding heat-resistance, remarkable filming ability, and high solubility in both phenol series and amide series solvents.

Abstract: Disclosed is a novel linear urethane-amide-imide copolymer composition obtained from first reacting X mols of diol compound, which had been dissolved in an inert organic solvent, with Y mols of diisocyanate compound at room temperature to produce an intermediate reaction product, followed by reacting the intermediate reaction product with Z mols of trimellitic anhydride at elevated temperatures, wherein Y is greater than X (i.e., the amount of diisocyante groups is in excess) and approximately equals the sum of X plus Z. The polyurethane copolymer composition obtained from this process contains urethane, amide and imide groups on the polymer backbone, exhibits excellent mechanical and electric properties and heat resistance, and does not suffer from the phase separation problems observed from polyurethane-polyamideimide blends.