Tabular acicular gypsum and method of filling paper

Details Tabular acicular gypsum and method of filling paper Tabular acicular gypsum and method of filling paper

C - Chemistry, Metallurgy

01

F

23/103, 9/67

C01F 11/46 (2006.01) D21H 17/09 (2006.01) D21H 17/67 (2006.01) D21H 21/52 (2006.01)

Patent

CA 1307903

TABULAR ACICULAR GYPSUM AND METHOD OF FILLING PAPER Abstract of the Disclosure A tabular variety of acicular gypsum crystal filler is prepared by hydrating calcium sulfate dihydrate particles in a seeded continuously stirred reactor at a low level of super-saturation to obtain crystals having an aspect ratio of about 100:10:1 and average length in the longest dimension of about 100-450 micrometers. For the manufacture of paper, the obtained tabular crystal slurry may be directly added to the paper pulp before web formation to obtain a filled paper having high filler retention.

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