Surface-treated silica filler, and resin composition containing surface-treated silica filler
AssigneeNamics Corporation
InventorsAyako Sato, Masashi Kajita
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Abstract
The present invention provides a surface-treated silica filler for suppressing an increase in viscosity when added to a resin composition used for applications such as a semiconductor sealing material, and the resin composition containing the surface-treated silica filler. The surface-treated silica filler of the present invention is surface-treated with a basic substance having an acid dissociation constant (pKa) of its conjugate acid of 9.4 or more.
Claims17
A surface-treated silica filler, wherein a basic substance having an acid dissociation constant (pKa) of its conjugate acid of 9.4 or more is chemisorbed to an acidic silanol group present on the surface of the silica filler by surface treatment with the basic substance having the pKa of 9.4 or more, and
- wherein the surface-treated silica filler has a pH of 5.3 to 7.3 after heat treatment at 150° C. for 4 hours.
Dependencies are inferred from the claim text.