Liquid composition and ink set, and image-forming process and apparatus using the same

A liquid composition for use in an ink-jet image forming process with an ink containing an anionic dye, or an anionic compound and a pigment, the liquid composition being ejected through an orifice of an ink-jet head by an ink-jet ejecting process, comprising a cationic oligomer and a nonionic polymeric substance, the liquid composition reacting with the anionic dye or the anionic compound in the ink to make the anionic dye or the anionic compound aggregated by contacting the liquid composition with the ink,

• wherein the cationic oligomer has one peak in a molecular weight region of not higher than 1,000 in a molecular weight distribution thereof as measured by GPC method, and
• wherein the nonionic polymeric substance has a weight average molecular weight of at least 2,000.

A liquid composition for use in an ink-jet image forming process with an ink containing an anionic dye, or an anionic compound and a pigment, the liquid composition being ejected through an orifice of an ink-jet head by an ink-jet ejecting process, comprising a first cationic substance and a second cationic substance,

• wherein each of the first cationic substance and the second cationic substance has one peak in respective molecular weight distributions of the first and the second cationic substances as measured by GPO method, and
• wherein positions of the peak in the respective molecular weight distributions are different from each other.

A liquid composition for use in an ink-jet image forming process with an ink containing an anionic dye, or an anionic compound and a pigment, the liquid composition being ejected through an orifice of an ink-jet head by an ink-jet ejecting process comprising a first cationic substance having a peak in a molecular weight region of not higher than 1,000 in a molecular weight distribution of the first cationic substance as measured by GPC method, and a second cationic substance having a peak in a molecular weight region of from 1,500 to 10,000 in a molecular weight distribution of the second cationic substance as measured by GPC method.

A liquid composition for use in an ink-jet image forming process with an ink containing an anionic dye or an anionic compound and a pigment, and for use in an ink-jet ejecting process, a cationic substance and a nonionic polymeric substance, the liquid composition aggregating the anionic dye or anionic compound in the ink by contacting the liquid composition with the ink,

• wherein the cationic substance has a weight average molecular weight of at most 1,000, and the nonionic polymeric substance has a weight average molecular weight of at least 2,000, and
• wherein the liquid composition is substantially free from any coloring materials.

A liquid composition for use in an ink-jet image forming process with an ink containing an anionic dye or an anionic compound and a pigment, the liquid composition being elected through an orifice of an ink-let head by an ink-jet ejecting process, comprising a cationic oligomer and a nonionic polymeric substance,

• the liquid composition reacting with the anionic dye or the anionic compound in the ink to make the anionic dye or anionic compound aggregated by contacting the liquid composition with the ink,
• wherein the cationic oligomer has one peak in a molecular weight region of not higher than 1,000 in a molecular weight distribution thereof as measured by GPC method, and the nonionic polymeric substance has a weight average molecular weight of at least 2,000, and
• wherein the liquid composition is substantially free from any coloring materials.

A liquid composition for use in an ink-jet image forming process with an ink containing an anionic dye, or an anionic compound and a pigment, the liquid composition being ejected through an orifice of an ink-jet head by an ink-jet ejecting process, comprising a first cationic substance and a second cationic substance,

• wherein each of the first and second cationic substances has one peak in a molecular weight distribution thereof as measured by GPC method,
• wherein the peak positions in the respective molecular weight distributions are different from each other, and
• wherein the liquid composition is substantially free from any coloring materials.

A liquid composition for use in an ink-jet image forming process with an ink containing an anionic dye, or an anionic compound and a pigment, comprising a first cationic substance and a second cationic substance,

• wherein the first cationic substance has one peak in a molecular weight region of not higher than 1,000 in a molecular weight distribution thereof as measured by GPC method, and the second cationic substance has one peak in a molecular weight region of from 1,500 to 10,000 in a molecular weight distribution thereof as measured by GPC method, and
• wherein the liquid composition is substantially free from any coloring materials.

A liquid composition for being ejected through an orifice of an ink-jet head by an ink-jet process, comprising a first cationic substance having one peak in a molecular weight distribution thereof as measured by GPC method, and a second cationic substance having one peak in a molecular weight distribution thereof as measured by GPC method,

• wherein peaks' positions are different from each other.