公开(公告)号：US20170210886A1

公开(公告)日：2017-07-27

申请号：US15328785

申请日：2015-07-28

Applicant: DENKA COMPANY LIMITED

Inventor： Kazuyoshi IKEDA ,  Motoharu FUKAZAWA ,  Takafumi KOMAKI

IPC: C08K9/06 ,  C09K5/14 ,  C09C1/40 ,  C01F7/02 ,  C08K7/18 ,  C08K3/22

CPC classification number: C08K9/06 ,  C01F7/02 ,  C01F7/021 ,  C01P2004/32 ,  C01P2004/61 ,  C01P2004/62 ,  C08K3/22 ,  C08K7/18 ,  C08K2003/2227 ,  C08K2201/001 ,  C08K2201/003 ,  C08K2201/005 ,  C08K2201/016 ,  C08L101/00 ,  C09C1/40 ,  C09C1/407 ,  C09K5/14

Abstract: Provided is a spherical alumina powder which, when incorporated into resins in a high concentration, enables a resin composition to have low viscosity and which has reduced viscosity increase in the resin composition over time after surface treatment of the spherical alumina powder. The spherical alumina powder has an alkyl group(s) derived from a silane compound(s) on its surface, and is characterized in that an intensity ratio {I (CH3)/I (CH2)} of a peak (2960±5 cm−1) associated with asymmetric vibration of CH3 to a peak (2925±5 cm−1) associated with asymmetric vibration of CH2 in the alkyl group(s) of the silane compound(s) in the same spectral data obtained by infrared spectroscopic analysis measurement is 0.2 or more and less than 2.0.