Patent ID: 11958971
Assignee: MITSUI CHEMICALS, INC.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  G  B  H | IPC B  C  G  H

Claim 0:
1. A photocurable composition used for forming a resin layer of a concave-convex structure including a substrate and a resin layer provided on the substrate and having fine concavities and convexities formed on a surface thereof,
wherein the photocurable composition has a surface free energy of 15 mJ/m2 to 40 mJ/m2 as measured by the following evaluation method 1, and a hardness of 0.05 GPa to 0.5 GPa as measured by the following evaluation method 2,
(evaluation method 1)
in which first, the photocurable composition is coated on a substrate to form a photocurable film, which is then irradiated with ultraviolet rays to obtain a cured film;
next, contact angles of water, diiodomethane, and 1-bromonaphthalene with respect to the cured film are measured using a contact angle meter; and
then, the surface free energy is calculated from a Kitazaki-Hata theory, and
(evaluation method 2)
in which first, a cured film is obtained in the same manner as in the evaluation method 1; and
next, using a nanoindenter, a Berkovich indenter is pressed against the cured film, and the hardness is calculated from a value of the detected stress.