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US 5,207,822 AGranted
Synergistic filler blends for wood-containing papers
AssigneeECC International Limited
InventorsJohn A. Manasso, Kenneth Mueller, Susan Di Donato
Life of this patent
Estimating the term…
Abstract
A high opacity, high light scattering filler pigment for use in wood-containing paper manufacture, comprising by weight 25 to 50% of a fine particle size hydrous kaolin which has been defined as to have particle size distribution such that less than 20% by weight are of less than 0.3 .mu.m E.S.D. and substantially the balance being a fine particle size calcined kaolin.
Claims5
A high opacity, high light scattering filler pigment for use in wood-containing paper manufacture, comprising by weight
- (a) 25 to 50% of a fine particle size hydrous kaolin which has been defined as to have a particle size distribution such that less than 20% by weight are of less than 0.3 .mu.m E.S.D., while not being chemically surface treated;
- and
- (b) substantially the balance being a fine particle size calcined kaolin.
Dependencies are inferred from the claim text.