Foamable polyorganosiloxane compositions

Details Foamable polyorganosiloxane compositions Foamable polyorganosiloxane compositions

1985-08-19

1986-02-25

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 98, 521122, 521131, 521133, 521134, 521139, 521154, 524588, 525477, 528 30, 528 33, 528 42, C08J 908, C08J 910, C08J 912

Patent

active

045729182

ABSTRACT:
Polyorganosiloxane foams exhibiting a desirable combination of low density, an average cell size below 4 mm. and an average cell concentration greater than 4 per linear centimeter are obtained by dispensing oxygen curable mercaptoorganosiloxane compositions containing a cobaltocene catalyst, a dispersed liquid or gaseous blowing agent and, as a foam stabilizer, a resinous organosiloxane copolymer comprising trimethylsiloxy units, SiO.sub.4/2 units and specified fluorine-containing organosiloxane units. The polymer portion of the composition includes at least one polyorganosiloxane containing at least 20 mole percent of dimethylsiloxane units and an average of more than 2 mercaptoalkyl or mercaptoalkylene groups per molecule.

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