Ceramic powder and use thereof

Details Ceramic powder and use thereof Ceramic powder and use thereof

2007-05-11

2011-11-22

Cain, Edward J (Department: 1762)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C524S492000, C524S493000

Reexamination Certificate

active

08063120

ABSTRACT:
The present invention herein provides ceramic powder which is to be incorporated into rubber or a resin and which can be used as, for instance, a semiconductor-sealing material and for the preparation of a composition excellent in the narrow interstice-filling up property and moldability. The ceramic powder has a multiple peak-frequency type particle size distribution which has at least two peaks, as determined according to the laser diffraction-scattering type particle size distribution analyzer, wherein the maximum particle size observed for the first peak falls within the range of from 12 to 30 μm; that observed for the second peak falls within the range of from 2 to 7 μm; the content of the particles having a particle size of greater than 7 μm and less than 12 μm is not more than 18% (including 0%); and wherein the ratio (F2/F1) of the frequency value F2 of the maximum particle size for the second peak to that F1 of the maximum particle size for the first peak ranges from 0.5 to 1.3.

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U.S. Appl. No. 12/300,516, filed Nov. 12, 2008, Nishi, et al.
Korean Office Action issued Dec. 20, 2010, in Patent Application No. 10-2008-7027269.

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