Silbond Corporation

Richard S Odneal

Adam William Emerson

Walter L Magee

Wallace G Joslyn

An stable ethylsilicate polymer having a dynamic viscosity of 10 centipoises (cps) to 1,000 cps at 25&#xb0; C. and 50 wt % to 60 wt % silica (SiO). The stable ethylsilicate polymer includes not greater than 1 wt % of TEOS monomer. The process of forming the ethylsilicate polymer includes a two step addition of catalysts. A hydrolysis catalyst is added initially, for example hydrochloric acid, and a second catalyst is added subsequently, such as phosphonitrilic chloride trimer. The ethylsilicate polymer is used to form MQ resins.

Stable ethylsilicate polymers

An MQ resin including at least 30% SiO, preferably at least 50 wt % SiO, and having dynamic viscosity of 50 centipoises (cps) to 750 cps at 25&#xb0; C. is produced from a stable ethylsilicate polymer. The ethylsilicate polymer includes not greater than 1 wt % of TEOS monomer. The ethylsilicate polymer is produced by a two step addition of catalysts wherein a hydrolysis catalyst, for example, hydrochloric acid is added initially and a second catalyst, such as phosphonitrilic chloride trimer, is added subsequently.

MQ resins from stable ethylsilicate polymers

A stable MQ resin solution with over 50% SiOand having viscosity of 50 cps at 25&#xb0; C. to about 750 cps at 25&#xb0; C. and which is essential free of monomer is disclosed. The stable resin solution is made by a two step addition of catalysts wherein a hydrolysis catalysts, as for example, hydrochloric acid is added initially and a second catalysts such as Phosphonitrilic chloride trimer is added subsequently.

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Morenci, MI, United States of America

Richard S Odneal