Ricoh Company, Ltd.

Shiseido Company, Limited

Goo Chemical Company, Ltd.

Takuya Furuta

Kazukiyo Nagai

Akihiko Matsuyama

Mitsuru Naruse

Yuusuke Koizuka

Minoru Hakiri

Kazuyuki Miyazawa

Keita Katoh

Masayasu Nonogaki

Makoto Uyama

Masato Matsumura

Mineo Abe

The invention provides a novel oil thickener that can impart a thickening effect for oils used in cosmetics, and a novel oil-soluble copolymer that can be used as the thickener. The cosmetic oil thickener of the invention is an oil-soluble copolymer having a monomer unit composed of a hydrophilic monomer, a monomer unit composed of an easily-crystallizing hydrophobic monomer, and a monomer unit composed of a poorly-crystallizing hydrophobic monomer.

Cosmetic oil thickener and oil-soluble copolymer

An inkjet recording ink, including: water; a water-soluble organic solvent; a pigment; and a phosphate group-containing copolymer, wherein the phosphate group-containing copolymer contains a structural unit represented by the following General Formula (1) and a structural unit represented by the following General Formula (2): where R1 denotes a hydrogen atom or a methyl group; Mdenotes an alkali metal ion, an organic amine ion, or a hydrogen ion; half or more of Min the copolymer is the alkali metal ion or the organic amine ion, the remainder of Mis the hydrogen ion; n and m each denote an integer of 0 to 6, provided that both of n and m are not 0; and a block of (CHO) and a block of (CHO) may be exchanged with each other, where R2 denotes a hydrogen atom or a methyl group. 

Inkjet recording ink, ink cartridge, inkjet recording method, inkjet recording device and ink recorded matter

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Kyoto, Japan

Takuya Furuta