C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
402/399, 400/410
C08L 83/06 (2006.01) C08K 5/09 (2006.01)
Patent
CA 1241786
ROOM TEMPERATURE VULCANIZABLE POLYSILOXANE HAVING A HEAT-ACTIVATED CATALYST ABSTRACT OF THE DISCLOSURE A two-component room temperature vulcanizable polysiloxane composition curable in the presence of a heat-activated catalyst is disclosed. The working life of a condensation curable organopolysiloxane containing terminal silicon-bonded hydroxy groups in a first- component is extended by using a metallic salt of an organic carboxylic acid catalyst in a second component by providing in combination with the metallic salt of an organic carboxylic acid catalyst, a solid, inert barrier material capable of melting at an elevated temperature, whereby the catalyst is activated when heat applied thereto, melts the solid barrier material. A cross- linking agent and optionally, a filler, are used in the components. In one embodiment, the catalyst is a tin carboxylate used as a core material and the solid, inert barrier material is calcium stearate used as a wall material to encapsulate the catalyst material.
434516
Company General Electric
Eckersley Raymond A.
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