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US 6,270,564 B1Granted
Process for the bleaching of pigments
AssigneeKemira Chemicals, Inc.
InventorPentti Hukkanen
Life of this patent
Estimating the term…
Abstract
The invention relates to a process for the bleaching of a mineral pigment or a synthetic pigment, in which process the pigment to be bleached is contacted with a solution which contains peracetic acid in order to obtain a pigment with a raised degree of brightness.
Claims9
A process for the bleaching of a gypsum pigment, comprising the step of contacting a gypsum pigment to be bleached with a solution which contains peracetic acid.
Dependencies are inferred from the claim text.