Patent ID: 8669332

Claim:
A method of preparing a thermoplastic composition, comprising oxidatively copolymerizing a monohydric phenol and a hydroxyaryl-terminated polysiloxane; wherein said oxidatively polymerizing the monohydric phenol and the hydroxyaryl-terminated polysiloxane comprises a monohydric phenol addition period characterized by a first temperature, a build period following the addition period and characterized by a second temperature greater than the first temperature, and a temperature ramp period between the addition period and the build period; and wherein the temperature ramp period comprises increasing the temperature at an average rate of about 0.01 to about 0.35° C. per minute; and wherein the thermoplastic composition incorporates greater than 80 weight percent of the hydroxyaryl-terminated polysiloxane into the poly(arylene ether)-polysiloxane block copolymer; and wherein the thermoplastic composition has a weight average molecular weight of 35,000 to about 150,000 atomic mass units.