Process for preparing polyesterimide from bis(hydroxyphthalimide)

Claim 1

A process for the preparation of a polyesterimide which comprises reacting a bis(hydroxyphthalimide) with a dicarboxylic acid dihalide in an organic solvent and in the presence of a tertiary amine, said bis(hydroxyphthalimide) represented by the following formula: ##STR22## wherein R 1 is a difunctional organic group selected from the groups (a), (b) or (c) wherein: (a) is an aromatic hydrocarbon group; (b) is hexylene; and (c) is diphenylmethane, diphenylsulfide, diphenylsulfone, diphenylether or diphenylketone, and said dicarboxylic acid dihalide represented by the following formula: ##STR23## wherein R 2 is a difunctional organic group selected from the group (a), (b), or (c) wherein: (a) is an aromatic hydrocarbon group; having 6 to 20 carbon atooms or a halogenated derivative thereof; (b) is an alkylene group; and (c) is a group represented by the following formula: wherein X is a group selected from the groups consisting of m is an integer of 1 or zero; and n is an integer of 1 to 5, and wherein Y is a halogen atom selected from the group consisting of fluorine, chlorine, bromine and iodine and Z is a halogen atom selected from the group consisting of fluorine, chlorine, bromine and iodine.