| 摘要 |
PROBLEM TO BE SOLVED: To obtain a molded item which undergoes a small vol. shrinkage in photocuring, exhibiting a high dimensional accuracy, and is excellent in softness, elastic recovery, and mechanical characteristics by compounding a urethanized acrylic compd., another free-radical-polymerizable compd., and a photopolymn. initiator. SOLUTION: This photocurable resin compsn. is prepd. by compounding at least one compd. (A) selected from among compds. represented by formulas I (wherein (a) is 1 or 2; R<1> is H or methyl provided when (a) is 2, then one or both of R<1> 's are methyl; A<1> is a di- or trivalent hydrocarbon group; (b) is 3-6; (c) is 3-14; and (d) is 2 or 3), II (wherein (e) is 1 or 2; R<2> and R<3> are each H or methyl provided when (e) is 2, then one or both of R<2> 's are methyl; A<2> is a di- or trivalent hydrocarbon group; (f) is 4-20; and (g) is 2 or 3), and III (wherein R<4> and R<5> are each H or methyl; A<3> is a di- or trivalent hydrocarbon group; (h) is 4-20; and (j) is 2 or 3), a free-radical-polymerizable acrylic or allylic compd. (B) other than component A, and a photopolymn. initiator (C) in a wt. ratio of A/B of (80:20)-(10:90) and in a wt. ratio of C/(A+B) of 0.1-10%. |
