Kao Corporation

Yuichi Irinatsu

Hiromichi Takahashi

Yoshitaka Miyauchi

Yukitaka Tanaka

Takashi Kobayashi

Aiko Noguchi

There is provided a deinking process carried out using white water according to which an excellent whiteness and an excellent areal ratio of residual ink fines can be secured while maintaining a proper pulp yield. In the deinking process comprising a flotation step wherein use is made of treatment water containing white water, at least part of the flotation step is effected in the presence of at least one compound selected from the group consisting of cationic compounds, amine compounds, acid salts of amine compounds, and ampholytic compounds.

Deinking process using amine compounds and white water recycling

A deinking method comprising the steps of liberating ink from waste paper as a raw material and removing the liberated ink from a flotation system, wherein a nonionic surfactant, e.g., a reaction product obtained by adding an alkylene oxide to a mixture of an oil & fat and an alcohol, an alkylene oxide adduct of a fatty acid, or an alkylene oxide adduct of a higher alcohol, is used for the liberation of ink, and the flotation step is effected in the presence of a cationic compound, an amine, an acid salt of an amine or an amphoteric compound at a pH of from 4 to 9, provides a high quality deinked pulp having a high whiteness and a little residual ink spots.

Wastepaper deinking method using amine or acid salt of amine in the flotation stage

In a deinking process at least comprising the step of stripping ink from wastepaper as the starting material and the step of removing the stripped ink from a flotation system, the contact angle of the aqueous solution portion of a slurry containing the stripped ink with the interfaces of ink particles in the flotation step is controlled to be at least 70&deg;.

Method for controlling deinking process using contact angle

Method for controlling deinking flotation using interfacial potential of

A substitute composition for cocoa butter comprises 5 to 60% by weight of an oleaginous composition (A) and 40 to 95% by weight of another oleaginous composition (B),

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Wakayama, Japan

Yuichi Irinatsu