Room temperature vulcanizable polysiloxane having a heat-activat

Details Room temperature vulcanizable polysiloxane having a heat-activat Room temperature vulcanizable polysiloxane having a heat-activat

1982-08-11

1984-07-24

Briggs, Sr., Wilbert J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524398, 524399, 524400, 524268, 525477, C08L 8306

Patent

active

044618549

ABSTRACT:
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.

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