Ricoh Company, Ltd.

Shiseido Company, Limited

Goo Chemical Company, Ltd.

Masato Matsumura

Kazukiyo Nagai

Akihiko Matsuyama

Mitsuru Naruse

Yuusuke Koizuka

Minoru Hakiri

Kazuyuki Miyazawa

Keita Katoh

Masayasu Nonogaki

Takumi Watanabe

Makoto Uyama

Mineo Abe

Takuya Furuta

Copolymers derived from hydrophobic monomers of formula (1), and hydrophilic monomers of formulas (2) and (3), are provided The copolymers are useful as gelling agents for oils used in cosmetics and cosmetic emulsions.

Copolymer and oily gelling agent

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

Masato Matsumura