RADICAL POLYMERIZABLE GROUP-CONTAINING URETHANE PREPOLYMER, URETHANE (METH)ACRYLATE, PHOTOCURABLE RESIN COMPOSITION, HARD COAT FILM, AND MOLDED PRODUCT

摘要

PROBLEM TO BE SOLVED: To provide a radical polymerizable group-containing urethane prepolymer and urethane (meth)acrylate usable for a hard coat agent which (1) causes no tackiness just after application, (2) has flexibility to follow a curved surface of a mold when used for molding and not to cause appearance defects such as cracks and has mechanical strength allowing handling at molding temperature, and (3) shows high surface hardness sufficient as a had coat when finished as an end product; a photocurable resin composition using these compounds; and a hard coat film and a molded product using the photocurable resin composition.

SOLUTION: The radical polymerizable group-containing urethane prepolymer has a molecular structure wherein (A) a compound having at least two hydroxyl groups and one free-radical polymerizable group in one molecule and a compound (B) having two or more isocyanate groups in one molecule are connected together. A side chain radical polymerizable group equivalent originating from the component (A) is 1,500 g/mol or less.

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