Curable organopolysiloxane composition and mother mold for...

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

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C528S015000, C528S031000, C528S032000

Reexamination Certificate

active

11178503

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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patent: 3220972 (1965-11-01), Lamoreaux
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patent: 5288795 (1994-02-01), Fujiki et al.
patent: 5777047 (1998-07-01), Chung et al.
patent: 2002/0129898 (2002-09-01), Takuman et al.
patent: 1186818 (1998-07-01), None

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