Ricoh Company, Ltd.

Matsumoto Seiyaku Kogyo Kabushiki Kaisha

Makoto Okawara

Kazuo Tsubuko

Shinichi Kuramoto

Akihiko Gotoh

Kazuhiko Umemura

Makoto Kameyama

Tsuyoshi Asami

Nobutaka Kinoshita

Junichiro Hashimoto

Iwakichi Sugiyama

Kayoko Nagai

Yukihisa Takaoka

Hajime Takanashi

Kazuyo Mizuno

An ink composition contains a carrier medium and charged particles containing a coloring agent, which ink composition satisfies at least one condition of condition A or B: condition A that the specific charge quantity of the charged particles is in a range of 10 to 1,000 .mu.C/g with a positive or negative polarity; and condition B that the specific resistance of the ink composition is 10.sup.10 .OMEGA.cm or more; and ink-jet recording methods using the ink composition are proposed.

Ink composition and recording method using the same

This invention relates to a non-aqueous type resin dispersion obtained by polymerizing a polymerizable composition containing at least monomer A represented by the general formula (I), ##STR1## (wherein, R.sup.1 represents --H or --CH.sub.3, X represents --COOC.sub.n H.sub.2n+1 or --OCOC.sub.n H.sub.2n+1, and n represents an integer of 6-20), monomer B represented by the general formula (II), ##STR2## (wherein, R.sup.2 and R.sup.3 represent --H or --CH.sub.3 and m represents an integer of 1-20), and monomer C having a carboxyl group or a glycidyl group in the presence of a polymerization initiator in an aliphatic hydrocarbon solvent.

Non-aqueous type resin dispersion and electrophotographic developer

This invention relates to a non-aqueous type resinous composition obtained by polymerizing a polymerizable composition containing at least monomer A represented by the general formula (I), ##STR1## (wherein R represents --H or --CH.sub.3, X representing --COOC.sub.n H.sub.2n+1 or --O--CO--C.sub.n H.sub.2n+1, and n representing an integer of 6-20) and monomer B represented by the general formula (II), ##STR2## (wherein R represents --H or --CH.sub.3, n representing an integer of 1-20, and M representing --H, Na, K, Mg, Mn, Ca, Li, Al or Co) in the presence of a polymerization initiator in an aliphatic hydrocarbon solvent.

Non-aqueous type resin and electrophotographic developer containing the

A liquid developer for use in electrophotography is disclosed which is prepared by dispersing a toner consisting essentially of a pigment or dye and a resin in a carrier liquid having a high insulating property and a low dielectric constant, wherein said resin is a nonaqueous dispersed resin obtained by effecting, in a nonaqueous solvent comprising an aliphatic hydrocarbon, the steps of:

Liquid developer for use in electrophotography

A process for producing an .alpha.-cyanoacrylate which comprises reacting a cyanoacetate with formaldehyde in the presence of a catalyst and a solvent, wherein a compound having phase transfer catalytic activity is used as the catalyst.

Process for preparing an .alpha.-cyanoacrylate

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Tokyo, Japan

Makoto Okawara