Kao Corporation

Kazuhiro Ishikawa

Kazuo Kuwahara

Yuki Wakabayashi

Yu Saito

Akito Itoi

Kenko Kurita

Hiromi Nambu

Yukihiro Fukuyama

Kouji Ohsaki

Eiko Tamura

Abstract Provided is an oil-based cosmetic preparation which retains a smooth feel. Provided is an oil-based cosmetic preparation containing the following components (A), (B), and (C): (A) a cellulose derivative having a cellulose skeleton in a main chain, in which 67 mol % or more in total hydroxyl groups are substituted with a group &#x2014;O-M-R, wherein M represents CH2 or a carbonyl group C&#x2550;O, and R represents a straight or branched alkyl or alkenyl group having 3 to 40 carbon atoms; (B) an ester oil which is liquid at 25&#xb0; C.; and (C) a hydrocarbon oil which is liquid at 25&#xb0; C., in which a weight ratio (B)/(C) of the component (B) to the component (C) is 8/1 to 1/4.

Oil-based cosmetic preparation

The present invention provides a nonaqueous pigment dispersant containing a copolymer having: (a) a constituent unit derived from a nitrogen atom-containing polymerizable macromonomer having an ethylenic unsaturated double bond at one terminal, and (b) a constituent unit derived from a monomer unit having an ethylenic unsaturated double bond, being copolymerizable with the nitrogen atom-containing polymerizable macromonomer of constituent (a), and a pigment dispersion composition containing the dispersant, a pigment and a nonaqueous solvent.

Pigment dispersant containing a copolymer with constituent units derived from polymerizable macromonomers

The present invention relates to a process for readily producing a toner for electrophotography which contains toner particles having a small particle size and a narrow particle size distribution, and a toner for electrophotography having a small particle size and a narrow particle size distribution which is produced by the above process. There is provided a process for producing a toner for electrophotography which includes the steps of (A) finely dispersing a resin binder in an aqueous medium in the presence of a nonionic surfactant to prepare a dispersion of resin binder-containing fine particles; (B) aggregating the resin binder-containing fine particles obtained in the step (A) together to prepare a dispersion of mother particles; (C) adding a dispersion of a resin binder-containing fine particles at one time or sequentially in several divided parts to the dispersion of the mother particles obtained in the step (B) to prepare aggregated particles thereof; and (D) coalescing the aggregated particles obtained in the step (C), as well as a toner for electrophotography which is produced by the above process.

Process for producing toner for electrophotography

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Wakayama, Japan

Kazuhiro Ishikawa