The Inctec Inc.

Seiko Epson Corporation

Tamayo Okahira

Yukio Sugita

Mitsuyoshi Tamura

Fumie Yamazaki

Mitsuteru Yamada

Seiji Mochizuki

Masahiro Nakamura

Makoto Otsuki

The present invention is proposed is an oil-based white ink composition for ink jet recording, comprising a white pigment, a glycol ether dialkyl ether compound solvent, a polymeric dispersant, and a specific acrylic resin. The white pigment is formed of titanium oxide fine particles having an average particle diameter of not less than 0.15 &#x3bc;m and not more than 0.25 &#x3bc;m and coated with at least one of aluminum oxide and silicon oxide. The white pigment is further coated with not less than 0.01% by mass and not more than 2.5% by mass of at least one of an SiH-containing polysiloxane and dimethylpolysiloxane.

Oil-based white ink jet recording composition and process for producing the same

An oil-based ink composition for inkjet recording capable of exhibiting desired properties of drying after print, rubfastness and re-solubility is achieved by performing solubilization on an acrylic resin which is not easily dissolved conventionally. The oil-based ink composition for inkjet printing comprises glycol ether dialkyl ethers as a prime solvent; and an acrylic resin that results from solution polymerization in a solvent of the glycol ether dialkyl ethers by use of a radical polymerization initiator.

Oil-based ink composition for inkjet recording

Disclosed are a process for producing a polymer composition having a high solubility in a solvent, and a polymer composition. The process for producing a polymer composition comprises polymerizing a radical polymerizable monomer in a solvent comprising a compound of formula (1) or (2) in the presence of a radical polymerization initiator: 

Method for producing polymer composition and polymer composition

An oil-based ink composition for inkjet printers contains a fixing polymer and a solvent represented by the following formula (1): wherein X1 represents an alkyl group, X2 represents a hydrogen atom or alkyl group, and n stands for an integer of from 1 to 4. The fixing polymer is an acrylic polymer obtained by subjecting an acrylic monomer to solution polymerization with a radical polymerization initiator in the solvent. A production process of the oil-based ink composition is also disclosed.

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Yokohama, Japan

Tamayo Okahira