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US 10,683,613 B2Granted
Compositions for bleaching pulps and their use
AssigneeImerTech SAS
InventorMikko Likitalo
Life of this patent
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Abstract
Compositions suitable for use in the bleaching of pulps may include one or more particulate alkaline earth metal oxides or alkaline earth metal hydroxides or mixtures thereof, and one or more pitch control additives. The compositions may be suitable for use in a pulp preparation or a papermaking process. A method for the bleaching of pulps may include providing the composition.
Claims9
A composition for use in bleaching of pulps, the composition comprising:
- (a) one or more particulate alkaline earth metal oxides or alkaline earth metal hydroxides or mixtures thereof;
- and
- (b) a talc pitch control additive and, optionally, one or more pitch control additives selected from zeolite, diatomaceous earth, cationic mica, hydrophobic carbonates, resin-decomposing enzymes, cationic polymers, aluminium sulphate, polyaluminium chloride, dispersing agents, and mixtures thereof,
- wherein the composition is an aqueous slurry having a total solids content of 10 wt.-% to 75 wt.-% on the basis of the total weight of the slurry,
- wherein the weight ratio of the particulate alkaline earth metal oxide or alkaline earth metal hydroxide compared to the talc pitch control additive ranges from 9:1 to 1:9, and
- wherein the talc pitch control additive is selected from micronized talc, bimodal talc, and cationic talc.
3 more elements
Dependencies are inferred from the claim text.