Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Reexamination Certificate
2003-12-25
2008-11-18
Le, H. T (Department: 1794)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
C428S331000
Reexamination Certificate
active
07452599
ABSTRACT:
This invention provides flame-generated fine silica particles having an average particle size of 0.05 to 1 μm, wherein a fractal structure parameter α1at length scales ranging from 50 nm to 150 nm and a fractal structure parameter α2at length scales ranging from 150 nm to 353 nm satisfy the following formulas (1) and (2):in-line-formulae description="In-line Formulae" end="lead"?−0.0068S+2.548≦α1≦−0.0068S+3.748 (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−0.0011S+1.158≦α2≦−0.0011S+2.058 (2)in-line-formulae description="In-line Formulae" end="tail"?wherein S is a BET specific surface area (m2/g) of the fine silica particles,in the measurement of small-angle X-ray scattering. When used as a filler for a semiconductor-encapsulation resin or when used as a filler for a polishing agent or for a coating layer for ink jet papers, the fine silica particles are available at high content without substantial enhancement of the viscosity. Besides, when used as a filler for the resin, the fine silica particles improve the strength of the molding compound. Furthermore, when used as a toner additive for electrophotography, the fine silica particles improve the free-flow property of the toner without removal from the toner surfaces.
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Aoki Hiroo
Kimura Minoru
Ohara Masakazu
Buchanan & Ingersoll & Rooney PC
Le H. T
Tokuyama Corporation
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