Liquid curable fluorosilicone composition and production...

Details Liquid curable fluorosilicone composition and production... Liquid curable fluorosilicone composition and production...

2010-03-11

2011-11-15

Loewe, Robert (Department: 1766)

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

Synthetic resins

From silicon reactant having at least one...

C528S042000

Reexamination Certificate

active

08058381

ABSTRACT:
A liquid curable fluorosilicone composition having improved defoamability is provided. The composition comprises (A) an organopolysiloxane having a viscosity at 25° C. of 100 to 500,000 mPa·s and represented by the following formula:in-line-formulae description="In-line Formulae" end="lead"?(CF3CH2CH2)aRbSiO(4-a-b)/2in-line-formulae description="In-line Formulae" end="tail"?wherein R is a monovalent hydrocarbon group with the proviso that at least 0.001% by mole of the hydrocarbon group is an alkenyl group, a is 0.1 to 1.0, b is 2.5 to 1.0, and a+b is 1.8 to 3.0,(B) an organohydrogenpolysiloxane containing at least two hydrogen atoms bonded to the silicon atom in a molecule,(C) an addition catalyst, and(D) a diorganopolysiloxane having a viscosity at 25° C. of 1 to 10,000 mPa·s which does not comprise trifluoropropyl group but comprises dimethylsiloxane unit.

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