| abstract |
A water permeability-imparting agent containing an alkylene oxide adduct (A) of a polyvalent active hydrogen compound represented by Formula (1): n R—[O(A 1 O) m —(CH 2 CH 2 O) n —H] 1 ( 1 )n n wherein R represents a residue, after removal of all active hydrogen, of the polyvalent active hydrogen compound; A 1 O represents a C2 to C4 alkyleneoxy group; m represents an average addition mole number of A 1 O and is a number of 4 to 50; n represents an average addition mole number of CH 2 CH 2 O; and 1 represents a valence and is an integer of 3 to 6, and an average addition mole number ratio between A 1 O and CH 2 CH 2 O in Formula (1), n/m, is 0 to 0.5. |