公开(公告)号：WO1990012765A1

公开(公告)日：1990-11-01

申请号：PCT/US1990002157

申请日：1990-04-20

Applicant: THIELE KAOLIN COMPANY

Inventor： THIELE KAOLIN COMPANY ,  SHI, Joseph, C., S. ,  CURTIS, Jerry, L. ,  SALTER, Timothy, L.

IPC: C04B14/10

CPC classification number: C09C1/42 ,  C01P2006/60 ,  D21H17/68 ,  D21H19/40

Abstract: An opacifying pigment with enhanced light scattering properties for use as a paper coating or filler material is produced by reacting kaolin in the presence of water with sodium hydroxide or potassium hydroxide at a temperature in excess of 60°C. The kaolin is reacted with the hydroxide in a concentration to produce a molality of at least 0.1.