Curable branched organopolysiloxane, high energy ray-curable composition containing same, and use thereof

Abstract

[OBJECT] To provide an organopolysiloxane having favorable fine patterning properties (including coatability), a favorable alkali solubility and a favorable high energy beam-curability, and capable of forming a cured film having a high transparency and a practically sufficient mechanical strength when cured, and to provide, along with the use thereof, a high energy beam-curable composition containing the organopolysiloxane. [SOLUTION] Provided are a curable branched organopolysiloxane and a use thereof, wherein the curable branched organopolysiloxane is represented by an average unit formula (1): (R3SiO1/2)a(R2SiO2/2)b(RSiO3/2)c(SiO4/2)d(O1/2Z)e (1) (wherein R is a group selected from a monovalent hydrocarbon group, an alkoxy group, a hydroxyl group, and a phenolic hydroxyl group-containing group; 0≤a, 0≤b, 0<c, 0≤d, 0≤e, 0.8≤c/(a+b+c+d+e); and the molecule has at least one phenolic hydroxyl group-containing group therein), and wherein the curable branched organopolysiloxane has a weight average molecular weight of 4,000 or less and a polydispersity of 1.3 and less, and preferably has a cage-like molecular structure.

Dependencies are inferred from the claim text.