| 摘要 |
PURPOSE:To obtain the title composition which has a reduced cure shrinkage and can form a coating film excellent in adhesiveness to base material, surface hardness, and abrasion resistance, by mixing a silicone-modified acrylic polymer, an alpha,beta-unsaturated carboxylic acid, a colloidal silica, and a photopolymerization initiator. CONSTITUTION:A photo-setting composition is obtained by mixing 100pts.wt. silicone-modified acrylic polymer (A) comprising a copolymer of a radical- polymerizable acrylate monomer of formula I [wherein X1 is H or lower alkyl; X2 is H or an (un)substituted aliphatic or cyclic hydrocarbon residue having a valence of n; n is 1-4] with an acryloxy-functional silane of formula II (wherein X3 is H or lower alkyl; X4 is a divalent hydrocarbon group; X5 is a monovalent hydrocarbon group), 10-200pts.wt., preferably 20-130pts.wt., alpha,beta-unsaturated carboxylic acid compound (B) preferably comprising acrylic acid or an ester thereof, 1-100pts.wt., preferably 5-50pts.wt., colloidal silica (C) (preferably dispersed in a lower alcohol), and 0.1-10pts.wt. photopolymerization initiator (D). |
