Polymer, process for production, composition for film formation containing the same, method of film formation, and insulating film

A polymer having repeating units represented by the following general formula (1):

• 14
• wherein Z is at least one bivalent aromatic group selected from the group consisting of bivalent aromatic groups represented by the following general formulae (2) and (3):
• 15
• wherein R1 and R2 each independently represent a single bond, —O—, —CO—, —CH2—, —COO—, —CONH—, —S—, —SO2—, a phenylene group, a fluorenylene group, or a bivalent group represented by the formula
• 16
• R3, R4, R5, and R6 each independently represent a hydrocarbon group having 1 to 20 carbon atoms, a cyano group, a nitro group, an alkoxyl group having 1 to 20 carbon atoms, or an aryl group;
• a is an integer of 1 to 3;
• and b, c, d, and e each independently are an integer of 0 to 4 and Y is at least one bivalent aromatic group selected from the group consisting of bivalent aromatic groups represented by the following general formulae (4) and (5):
• 17
• wherein R7 and R8 each independently represent a single bond, —O—, —CO—, —CH2—, —COO—, —CONH—, —S—, —SO2—, a phenylene group, or a fluorenylene group;
• R9, R10, R11, and R12 each independently represent a hydrocarbon group having 1 to 20 carbon atoms, a cyano group, a nitro group, an alkoxyl group having 1 to 20 carbon atoms, or an aryl group;
• f is an integer of 0 to 3;
• and g, h, i, and j each independently are an integer of 0 to 4.