Copolymers are formed of monomers of poly(dimethylsiloxane) and poly(alkylene oxide) of the following formula: Ax-XCH2CH2—[ByCz]n—X-Ax. In the formula, each X independently represents a —CH2— group or an oxygen atom, A represents a polydimethylsiloxane derivative, B represents a polyethylene glycol unit, C represents a polypropylene glycol unit, x and n independently represent an integer from 1 to 150, and y and z independently represent an integer from 0 to 150. The copolymers can be used as emulsifiers in personal care compositions.