Chemically resistant ultrasonically weldable parts and ultrasonically welded articles thereof

Abstract

An ultrasonically weldable part comprising improved weld strength and chemical resistance comprises a thermoplastic composition comprising a poly(carbonate-siloxane) composition comprising: a poly(carbonate-siloxane) comprising 30 to 70 wt % siloxane repeating units present in an amount effective to provide less than 6 wt % siloxane repeating units, based on the total weight of the thermoplastic composition, or a poly(carbonate-siloxane) comprising 30 to 70 wt % siloxane repeating units and a poly(carbonate-siloxane) comprising 2 wt % to less than 30 wt % siloxane repeating units, optionally, a polycarbonate, and optionally an additive composition, wherein the siloxane domain of a molded sample of the thermoplastic composition has an average diameter of 70 nm or less, measured using atomic force microscopy.

Dependencies are inferred from the claim text.