A composition comprising at least one thermoplastic resin and a silicone-masterbatch, articles comprising the compositions, devices comprising the articles, and processes for preparing the article. The compositions are suitable for use as part of or as a separator material for use in an electrochemical device. The composition is used to prepare a film, a membrane, a matrix, a resin, a coating, or a paint, etc., which can be employed as a separator or to coat or form part of a layer of a separator material useful in a device such as an electrical storage device such as, for example, a battery, a fuel cell, a capacitor, etc.