POLYMERIZATION OF POLYDIORGANOSILOXANE IN THE PRESENCE OF FILLER

A method of polymerizing hydroxyl-endblocked polydiorganosiloxane in the presence of filler, including acidic fillers such as fumed silica, through the use of basic diorganosilanolate catalysts is disclosed. Preferred diorganosilanolates are tetra-n-butylphosphonium dimethylsilanolate and potassium...

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Bibliographische Detailangaben
Hauptverfasser:	GARY NED BOKERMAN, NEAL ROGER LANGLEY
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS
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Beschreibung
Zusammenfassung:	A method of polymerizing hydroxyl-endblocked polydiorganosiloxane in the presence of filler, including acidic fillers such as fumed silica, through the use of basic diorganosilanolate catalysts is disclosed. Preferred diorganosilanolates are tetra-n-butylphosphonium dimethylsilanolate and potassium dimethylsilanolate. The silicone polymer-filler mixture produced is useful in silicone greases and elastomers. Methods of combining the silicone polymer-filler mixture with various curing agents to yield curable compositions are claimed.