Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-10-09
1997-12-09
Marquis, Melvyn
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525477, 528 15, 528 17, 528 18, 528 21, C08F28300
Patent
active
056962096
ABSTRACT:
The invention pertains to an dual-cure silicone adhesive composition that is extrudable and flowable at room temperature in the absence of a solvent comprising (A) 40 to 95 parts of an alkenyl functional siloxane resin said resin containing 0.01 to 22 wt% alkenyl functionality; (B) 0.5 to 20 parts of a SiH containing polyorganosiloxane having an average of at least 1.7 silicon-bonded hydrogen atoms per molecule and having a viscosity of 0.8 to 2,000 mm.sup.2 /s; (C) a silane represented by monomers of the formula R.sup.1.sub.4-y Si(OR.sup.2).sub.y or oligomeric reaction products thereof; (D) a hydrosilylation catalyst in sufficient quantity to promote curing of said composition; (E) a moisture curing catalyst to promote the moisture initiated reaction of the alkoxy radicals; (F) optionally, 0.1 to 70 parts of a polydiorganosiloxane having at least two ethylenically or acetylenicaly unsaturated groups per molecule and having a viscosity of 100 to 80,000 mm.sup.2 /s; and (G) optionally, an inhibitor in sufficient quantity for the composition to be stable at room temperature;
wherein at least one of said resin (A), SiH containing polyorganosiloxane (B) and/or optional polydiorganosiloxane (F) contain a curing radical of the formula --ZSiR.sup.1.sub.x (OR.sup.2).sub.3-x.
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King Russell Keith
Lee Chi-Long
Dow Corning Corporation
Marquis Melvyn
Severance Sharon K.
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