Polyorganosilsesquioxane, hard coat film, adhesive sheet, and laminate

A method for producing a hard coat film, the method comprising the step of:

• (B) applying a curable composition to at least one side of a substrate, and curing the applied curable composition to form a hard coat layer on the substrate to thereby give a hard coat film,
• the curable composition comprising a polyorganosilsesquioxane,
• the polyorganosilsesquioxane comprising:
• a constitutional unit represented by Formula (I);
• and
• a constitutional unit represented by Formula (II), in a mole ratio of the constitutional unit represented by Formula (I) to the constitutional unit represented by Formula (II) of from 5 to 18,
• the polyorganosilsesquioxane comprising
• a constitutional unit represented by Formula (2), and
• an optional constitutional unit represented by Formula (5),
• the polyorganosilsesquioxane having a total proportion of the constitutional unit represented by Formula (I) and a constitutional unit represented by Formula (II) of 95% to 99% by mole based on a total amount (100% by mole) of all siloxane constitutional units,
• the polyorganosilsesquioxane having a total proportion of the constitutional unit represented by Formula (2) and a constitutional unit represented by Formula (5) of 1% to 5% by mole based on a total amount (100% by mole) of all siloxane constitutional units,
• the polyorganosilsesquioxane having a number-average molecular weight of 1100 to 2600 and a molecular-weight dispersity (weight-average molecular weight to number-average molecular weight ratio) of 1.1 to 2.0,
• Formulae (I), (II), (2), and (5) expressed as follows:
• [RaSiO3/2] (I)
• wherein Ra is selected from:
• a group represented by Formula (1a);
• a group represented by Formula (1d),
• Formulae (1a) and (1d) expressed as follows:
• wherein R1a represents an ethylene group,
• wherein R1d represents an ethylene group,
• [RbSiO(ORc)] (II)
• wherein Rb is selected from:
• a group represented by Formula (1a);
• and
• a group represented by Formula (1d),
• Formulae (1a) and (1d) expressed as follows:
• wherein R1a represents an ethylene group,
• wherein R1d represents an ethylene group;
• and
• Rc is selected from a hydrogen atom and a C1-C4 alkyl group,
• [R2SiO3/2] (2)
• wherein R2 is an unsubstituted phenyl group, and
• [R2SiO(ORc)] (5)
• wherein R2 is as defined in Formula (2);
• and Rc is as defined in Formula (II).