A thermosetting composition, comprising components (A-1), (A-2), (B), and (C), and
- having a viscosity of from 5 to 200 Pa·s at a shear rate of 10 s−1 at 25° C., and having a viscosity of from 1 to 50 Pa·s s at a shear rate of 100 s−1 at 25° C., as measured by JIS K7117-2,
- wherein
- the component (A-1) is an acrylate compound or a methacrylate compound in which a substituted or unsubstituted alicyclic hydrocarbon group including 6 or more ring carbon atoms is ester-bonded,
- the compound (A-2) is a compound of formula (I-1):
- wherein in the formula (I-1), Y1, Y2 and Y3 independently represent a hydroxy substituted alkylene group including 1 to 10 carbon atoms or an alkylene group including 1 to 10 carbon atoms;
- X1 and X2 independently represent an alkylene group including 1 to 10 carbon atoms, or a hydroxy substituted alkylene group including 1 to 10 carbon atoms;
- Z represents —Z1-Z2-Z3—, or —Z4-Z5-Z6—;
- R11 and R12 independently represent a hydrogen atom or a methyl group;
- Z1 and Z3 independently represent a substituted or unsubstituted divalent aromatic hydrocarbon group including 6 to 12 ring carbon atoms, or a substituted or unsubstituted divalent alicyclic hydrocarbon group including 6 to 12 ring carbon atoms;
- Z2 represents —C(CH3)2—, —C(CF3)2—, —CH2—, —S(═O)2—, —O— or —C(═O)—;
- Z4 and Z6 independently represent a divalent organic group;
- Z5 represents a substituted or unsubstituted divalent fluorenyl group, or a substituted or unsubstituted divalent naphthyl group;
- a and b independently represent an integer of 0 to 10;
- c, d and e independently represent 0 or 1;
- f represents an integer of 1 to 5;
- a+(b×f)+c+d+(e×f) is 2 or more,
- the component (B) is a spherical silica, and
- the component (C) is a white pigment.