Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2008-07-01
2008-07-01
Peng, Kuo-Liang (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C528S015000, C528S031000, C528S032000
Reexamination Certificate
active
07393893
ABSTRACT:
A curable organopolysiloxane composition is provided, which is capable of generating a silicone rubber mother mold with improved mold release durability. The composition includes (A) 100 parts by mass of an organopolysiloxane containing at least two Si-bonded alkenyl groups within each molecule, (B) an organohydrogenpolysiloxane containing at least two Si-bonded hydrogen atoms atoms within each molecule, in sufficient quantity to provide 0.4 to 5.0 mols of Si-bonded hydrogen atoms within the component (B) for each 1 mol of Si-bonded alkenyl groups within the composition, (C) 5 to 50 parts by mass of a finely powdered silica with a specific surface area measured by nitrogen gas absorption of at least 50 m2/g, (D) 0.1 to 50 parts by mass of heavy calcium carbonate with a specific surface area measured by air permeability of 0.5 to 2.5 m2/g, the surface of which has been treated with a paraffin-based compound, and (E) an effective quantity of a platinum group metal-based catalyst.
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Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Peng Kuo-Liang
Shin-Etsu Chemical Co. , Ltd.
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