METHOD FOR PRODUCING POLYBENZOXAZOLE RESIN

摘要

A method for producing a polybenzoxazole resin, in which even when a polybenzoxazole precursor is heat treated at a low temperature, a polybenzoxazole resin that is excellent in mechanical properties, such as tensile elongation, and in chemical resistance, is suppressed in terms of coloration, and is high in transparency can be produced. A polybenzoxazole resin is formed by heating a polybenzoxazole precursor which is obtained by allowing an aromatic diaminediol and a diformyl compound or a dicarboxylic acid dihalide, to react with each other in a solvent containing an amide compound or a urea compound each having a specified structure, at 120° C. to 350° C.

主权项

1. A method for producing a polybenzoxazole resin, comprising heating a polybenzoxazole precursor which is obtained by allowing an aromatic diaminediol represented by the following formula (1) and a dicarbonyl compound represented by the following formula (2) to react with each other in a solvent containing at least a compound (A) represented by the following formula (5), at 120° C. to 350° C.: wherein R1 is a tetravalent organic group containing at least one aromatic ring; and with respect to two pairs of combinations of an amino group and a hydroxyl group contained in the aromatic diaminediol represented by the formula (1), in each of the combinations, the amino group and the hydroxyl group are bonded to two carbon atoms adjacent to each other on the aromatic ring contained in R1, wherein R2 represents a divalent organic group; and A represents a hydrogen atom or a halogen atom, andwherein each of R3 and R4 is independently an alkyl group having 1 to 3 carbon atoms; and R5 is a group represented by the following formula (5-1) or (5-2): wherein R6 is a hydrogen atom or a hydroxyl group; each of R7 and R8 is independently an alkyl group having 1 to 3 carbon atoms; and each of R9 and R10 is independently a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.