Organopolysiloxane compositions

Details Organopolysiloxane compositions Organopolysiloxane compositions

2003-04-11

2004-11-02

Peng, Kuo-Liang (Department: 1712)

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...

C428S405000, C528S031000, C528S032000, C528S024000

Reexamination Certificate

active

06812280

ABSTRACT:

TECHNICAL FIELD
This invention relates to an organopolysiloxane composition which is heavily loaded with an inorganic filler, but effective for preventing the filler from settling down.
BACKGROUND ART
In the past, organopolysiloxane compositions are widely used in various applications as adhesives, coatings, electrically insulating sealants, and building sealants.
For reinforcement and similar purposes, fillers are often used in organopolysiloxane compositions. However, when organopolysiloxane compositions heavily loaded with inorganic fillers are stored for a long term in the uncured state, the inorganic fillers tend to settle down with the passage of time. This tendency becomes outstanding especially when the organopolysiloxane is liquid.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a filled organopolysiloxane composition which is effective for preventing the filler from settling down during long-term storage.
It has been found that when an inorganic filler which has been surface coated with an addition cure silicone composition in the cured state is added to an organopolysiloxane composition, the surface coating prevents the filler from settling down during storage, that is, the organopolysiloxane composition is endowed with an anti-settling effect.
The present invention provides an organopolysiloxane composition comprising an organopolysiloxane as a base polymer and an inorganic filler which has been surface coated with an addition cure silicone composition in the cured state.


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