Thermosetting composition for injection molding, method for producing molded article using the same, and cured product

A thermosetting composition for injection molding comprising:

• component (A) represented by the following formula (A2) or (A3), and
• component (B), a thermal polymerization initiator;
• wherein
• the composition further comprises no component (G) titanium oxide or comprises component (G) titanium oxide, when the composition comprises the component (G), the content of the component (G) is 5 parts by mass or less, based on a total of 100 parts by mass of components other than the component (B) and the component (G);
• and the composition comprises no polybutadiene di(meth)acrylate having structural units represented by the following formulas (1A) and (1B):
• wherein in the formula (A2),
• R111 and R115 independently represent a hydrogen atom or a methyl group,
• R112 represents an alkylene group including 1 to 20 carbon atoms,
• R113 and R114 independently represent an alkylene group including 1 to 30 carbon atoms,
• n112 represents an integer of 0 or 1, and
• n113 represents an integer of 0 to 30;
• wherein in the formula (A3),
• R121 represents an alkylene group including 1 t 6 carbon atoms,
• R122 represents a hydrogen atom or a methyl group,
• n120 represents an integer of 3 or 4,
• n121 represents an integer of 0 to 15,
• when n120 represents 3, Z120 represents a substituted or unsubstituted trivalent aliphatic hydrocarbon group including 3 to 10 carbon atoms, and
• when n120 represents 4, Z120 represents a substituted or unsubstituted tetravalent aliphatic hydrocarbon group including 5 to 10 carbon atoms;
• and