To obtain an emulsion composition which has excellent film-forming properties and can give a cured film excellent in water resistance, water repellency, etc., by emulsion-polymerizing a specified amount of a radically polymerizable compound in the presence of a silicone resin having a specified structure and a specified average molecular weight.
This composition is obtained by emulsion-polymerizing 10-1,000 pts.wt. radically polymerizable compound (B) in the presence of 100 pts.wt. silicone resin (A) represented by the formula and having a number-average molecular weight of 400-30,000, 0.5-15 wt.%, based on the total of components A and B, surfactant, and 0.1-10 wt.%, based on component B, polymerization initiator. Component A is obtained by hydrolyzing e.g. a hydrolyzable silane represented by the formula: R13SiX, R12SiX2, R1SiX3 or SiX4 in the presence of an acid and water. Component B is exemplified by an alkyl acrylate with a 1-18C alkyl or a glycidyl-containing vinyl monomer. In the formulae, R1 is hydrogen or a 1-10C monovalent hydrocarbon group; X is a halogen, an alkoxyl or the like; a and d>0 each; b and c≥0 each; a+b+c+d=1; and 0≤(b+c)≤0.3.
IKEDA TERUKI
AOKI HISASHI
