Thermosetting resin composition, cured film and method for producing same, and flexible printed board with cured film and method for producing same

2:

• The thermosetting resin composition according to claim 1, further comprising:
• a phosphorus-based flame retardant.

3:

• The thermosetting resin composition according to claim 2,
• wherein the phosphorus-based flame retardant is a phosphinic acid metal salt.

4:

• The thermosetting resin composition according to claim 1, further comprising:
• an organic spherical bead.

5:

• The thermosetting resin composition according to claim 4, wherein the organic spherical bead comprises crosslinked urethane.

6:

• The thermosetting resin composition according to claim 1, which is substantially free of a photopolymerization initiator and a thermal polymerization initiator.

7:

• A cured film, comprising:
• a thermally cured product of the thermosetting resin composition according to claim 1.

8:

• The cured film according to claim 7, wherein at least a portion of the compound having a (meth) acryloyl group remains unreacted.

9:

• The cured film according to claim 7, having a relaxation time of 1000 seconds or less.

10:

• A flexible printed board with a cured film, comprising:
• the cured film according to claim 7 on metal wirings.

13:

• The thermosetting resin composition according to claim 1, wherein an amount of each of a photopolymerization initiator and a thermal polymerization initiator in the thermosetting resin composition is less than 0.05 parts by weight per 100 parts by weight of a total solid content of the thermosetting resin composition.

14:

• The thermosetting resin composition according to claim 1, wherein an amount of each of a photopolymerization initiator and a thermal polymerization initiator in the thermosetting resin composition is less than 0.001 parts by weight per 100 parts by weight of a total solid content of the thermosetting resin composition.