C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 83/07 (2006.01) C08L 83/05 (2006.01)
Patent
CA 2087751
PATENTS 60SI-1490 ABSTRACT OF THE DISCLOSURE The combination of a substantially vinyl-oil-free composition comprising a vinyl-containing diorganopolysiloxane gum and a vinyl-containing organosiloxane resin will cure in the presence of a catalyst and a cross-linking agent to form a heat cured silicone elastomer having high tear and tensile strength and low compression set. In a particular embodiment, the composition comprises (A) 100 parts by weight of a vinyl-containing organopolysiloxane or blend having a viscosity of about 3,000,000 to about 100,000,000 centipoise at 25°C and being substantially free of vinyl-containing organosiloxane oil; and (B) from about 1 to about 30 parts by weight, based upon Component (A), of an organopolysiloxane resin or resins having MQ or MDQ units and up to about 10 weight percent vinyl groups. The composition also includes (C) up to about 200 parts by weight, based upon Component (A), of a filler and (D) up to about 2 parts by weight, based upon Component (A), of an organohydrogensiloxane cross-linking agent having a hydrogen content ranging from about .05 to about 2 weight percent and a viscosity from about 5 to about 500 centipoise at 25°C. The composition may further include a process aid, a coupling agent, a surface treatment for the filler, a catalyst, an acid acceptor, and a heat-age additive.
Doin James E.
Russell William D.
Slocum Gregory H.
Company General Electric
Craig Wilson And Company
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