| 摘要 |
A polyethersilicone represented by the following formula (1), said polyethersilicone being modified at an end of a silicone chain thereof, wherein A represents a polyether residue, n is an integer of from 0 to 3, x is 0 or 1, y is 0 or 1 and 1<=x+y, characterized in that a weight ratio, determined by H-NMR, of a polyether which is not bonded to a silicone chain of the polyether silicone to a total of the non-bonded polyether and the polyether residue bonded to the silicone chain of the polyethersilicone is 8% or less.
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