Particulate silica

Details Particulate silica Particulate silica

2005-05-19

2010-11-02

Choi, Ling-Siu (Department: 1796)

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

C423S338000, C423S339000, C516S116000, C524S492000, C524S493000

Reexamination Certificate

active

07824644

ABSTRACT:
There is provided particulate silica which can be suitably used as a viscoelasticity modifier such as a thickener which is added to liquid such as water, a liquid resin or paint to adjust its viscoelastic properties such as viscosity and thixotropic nature, a reinforcer or filler for silicone rubber or sealants, a polishing agent for CMP (Chemical Mechanical Polishing) or a surface coating agent for ink-jet printing paper.The particulate silica has a BET specific surface area S of 130 to 380 m2/g, and its fractal shape parameter α1in an α-value analysis target range of 20 to 30 nm satisfies the following equation (1) and its fractal shape parameter α2in an α-value analysis target range of 30 to 50 nm satisfies the following equation (2).in-line-formulae description="In-line Formulae" end="lead"?α1+0.00175S<2.518  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?α2+0.00174S<2.105  (2)in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
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Dale W. Schaefer et al., “Fractal Geometry of Colloidal Aggregates,” Physical Review Letters, Jun. 25, 1984, p. 2371 to p. 2374, vol. 52, No. 26.

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