Photosensitive composition, photosensitive film, photosensitive laminate, method of forming a permanent pattern, and printed board

A photosensitive composition, at least containing:

• a carboxyl group-containing photosensitive polyurethane resin;
• a phosphorus-containing flame retardant;
• a polymerizable compound;
• and
• a photopolymerization initiator,
• wherein both a resin polymer of the carboxyl group-containing photosensitive polyurethane resin and the polymerizable compound do not contain a phosphorus atom,
• wherein the carboxyl group-containing photosensitive polyurethane resin has the weight average molecular weight from 2,000 to 60,000, the acid value from 20 mg KOH/g to 120 mg KOH/g, and the ethylenically unsaturated group equivalent from 0.05 mmol/g to 3.0 mmol/g,
• wherein the carboxyl group-containing photosensitive polyurethane resin has, in the side chain thereof, at least one functional group represented by any one of formulae (1) to (3):
• in which R1 to R3 each independently represent a hydrogen atom or a substituent;
• X represents an oxygen atom, a sulfur atom, or —N(R12)—;
• and R12 represents a hydrogen atom or a substituent;
• in which R4 to R8 each independently represent a hydrogen atom or a substituent;
• Y represents an oxygen atom, a sulfur atom, or —N(R12)—;
• and R12 has the same meaning as R12 in formula (1);
• and
• in which R9 to R11 each independently represent a hydrogen atom or a substituent;
• Z represents an oxygen atom, a sulfur atom, —N(R13)—, or a phenylene group which may have a substituent;
• and R13 represents an alkyl group which may have a substituent;
• and
• wherein the at least one functional group represented by any one of formulae (1) to (3) does not link to a carbonyloxy-aliphatic group A (*) in a partial structure of the side chain, which partial structure links the group of any one of formulae (1) to (3) to the main chain of said polyurethane at the X, Y, or Z side, said carbonyloxy-aliphatic group A having a hydroxyl group or an acyloxy group substituted at the β position or γ position to the X, Y, or Z in an aliphatic moiety of the carbonyloxy-aliphatic group A and being linked to the structure of any one of formulae (1) to (3) which exists at the aliphatic moiety side (*) in the carbonyloxy-aliphatic group A.