초록 ▼

The present invention provides methods for deinking printed waste paper—particularly methods that use a deinking composition that includes a hydrophobically-modified inorganic particle (“MIP”) to improve ink collection efficiency under traditional alkaline, reduced alkali, and true neutral deinking

The present invention provides methods for deinking printed waste paper—particularly methods that use a deinking composition that includes a hydrophobically-modified inorganic particle (“MIP”) to improve ink collection efficiency under traditional alkaline, reduced alkali, and true neutral deinking conditions. Deinking compositions are provided that include a hydrophobically-MIP substrate, a nonionic surfactant, and a fatty acid, or mixtures thereof. The improved ink collection of the present invention can result in deinked pulp of high quality and/or yields that has excellent brightness and effective residual ink concentrations (“ERIC”) values.

대표청구항 ▼

We claim: 1. A method of deinking printed waste paper that comprises ink and paper pulp, comprising:a) converting the printed waste paper to an aqueous pulp slurry in a pulper;b) contacting said aqueous pulp slurry with a premixed deinking additive comprising an aqueous dispersible hydrophobically m

We claim: 1. A method of deinking printed waste paper that comprises ink and paper pulp, comprising:a) converting the printed waste paper to an aqueous pulp slurry in a pulper;b) contacting said aqueous pulp slurry with a premixed deinking additive comprising an aqueous dispersible hydrophobically modified inorganic particle which comprises a contact product of mixing calcium carbonate, wherein the calcium carbonate is in a ratio with a deinking composition ranging from 1:1 to about 40:1, wherein the deinking composition comprises a fatty acid, and a nonionic surfactant, wherein the nonionic surfactant comprises a fatty alcohol comprising from 5 to about 100 moles of alkoxylation;c) separating said ink in the aqueous pulp slurry; andd) recovering deinked paper pulp from the aqueous pulp slurry.