Epoxy group-terminated polydimethylsiloxane and a method for producing the same, and a curable polysiloxane composition

The present invention, without the addition of acid generating agent used for the ring-opening an epoxy group, to provide an epoxy group-containing polydimethylsiloxane may be ring-opening polymerization of epoxy groups, and polydimethylsiloxane providing a curable polysiloxane composition comprising. The epoxy group-containing polydimethylsiloxane has an organic group containing an epoxy group at the end, characterized in that one or two hydroxyl groups in the silicon which the epoxy-containing organic group is bonded is bonded .