Patent ID: 6573342
Filing Date: 2003-06-03
Classification: C08J,C08L

Abstract:
A method for preparing a blend, said blend comprising:a polyorganosiloxane (A) having at least one of a glass transition temperature (Tga) or a melting temperature (Tma), a polyphenylene ether (B) having at least one of a glass transition temperature (Tgb) or melting temperature (Tmb), wherein Tgab when polymers A and B are amorphous, Tmab when both polymers A and B are crystalline, Tgab when polymer A is amorphous and polymer B is crystalline, and Tmab when polymer A is crystalline and polymer B is amorphous, which comprises intimately mixing said polymers at a suitable temperature between the lower of Tga and Tma and the value of Tgb, for a time and under shear conditions sufficient to convert polymer A to dispersed particles coated with polymer B and produce a blend in the form of a free-flowing powder, said blend being free of silica filler and treated silica filler.