There is provided a treatment agent applicable to a recording surface of a recording medium which is recording paper or fabric. The treatment agent contains: a non-cationic sizing agent; and at least one cationic substance which is selected from the group consisting of: a cationic polymer capable of forming a flexible film in a case that the cationic polymer is dried, a cationic surfactant, a polyvalent metal salt and a polyvalent metal ion.

A treatment agent for image recording includes a cationic polymer emulsion and a cationic surfactant. A set usable for recording on a fabric includes a water-based ink for ink-jet recording including a colorant and water; and the treatment agent for image recording. A recording method for recording on a fabric by using the set includes: applying the treatment agent for image recording to the fabric; drying the treatment agent for image recording applied to the fabric; and jetting the water-based ink onto the fabric by an ink-jet system.

There is provided a treatment agent for image recording including: a cationic polymer emulsion; and a water-soluble organic solvent including a glycol-based water-soluble organic solvent of which boiling point is not more than 200 C. The treatment agent satisfies the following condition (1): 20A60. In the condition (1), A: a content amount (% by mass) of the glycol-based water-soluble organic solvent, of which boiling point is not more than 200 C., in an entire amount of the treatment agent for image recording.

There is provided a set including: a water-based ink for ink-jet recording including a dye and water; and a treatment agent including a cationic polymer emulsion which includes a cationic polymer including a urethane structure. There is provided a recording method for recording on a recording medium which is fabric or recording paper by using the set.

A treatment agent for image recording includes a cationic polymer emulsion and a cationic surfactant. A set usable for recording on a fabric includes a water-based ink for ink-jet recording including a colorant and water; and the treatment agent for image recording. A recording method for recording on a fabric by using the set includes: applying the treatment agent for image recording to the fabric; drying the treatment agent for image recording applied to the fabric; and jetting the water-based ink onto the fabric by an ink-jet system.

There is provided a treatment agent for image recording including: a cationic polymer emulsion; and a water-soluble organic solvent including a glycol-based water-soluble organic solvent of which boiling point is not more than 200 C. The treatment agent satisfies the following condition (1): 20A60. In the condition (1), A: a content amount (% by mass) of the glycol-based water-soluble organic solvent, of which boiling point is not more than 200 C., in an entire amount of the treatment agent for image recording.

There is provided a set including: a water-based ink for ink-jet recording including a dye and water; and a treatment agent including a cationic polymer emulsion which includes a cationic polymer including a urethane structure. There is provided a recording method for recording on a recording medium which is fabric or recording paper by using the set.

A set includes: a water-based black pigment ink for ink-jet recording; a water-based yellow dye ink for ink-jet recording; a water-based magenta dye ink for ink-jet recording; a water-based cyan dye ink for ink-jet recording; and a treatment agent. The water-based black pigment ink for ink-jet recording includes a carbon black and water; the water-based yellow dye ink for ink-jet recording includes a yellow dye and water; the water-based magenta dye ink for ink-jet recording includes a magenta dye and water; the water-based cyan dye ink for ink-jet recording includes a cyan dye and water; and the treatment agent includes a cationic polymer emulsion.

There is provided a treatment agent applicable to a recording surface of a recording medium which is recording paper or fabric. The treatment agent contains: a non-cationic sizing agent; and at least one cationic substance which is selected from the group consisting of: a cationic polymer capable of forming a flexible film in a case that the cationic polymer is dried, a cationic surfactant, a polyvalent metal salt and a polyvalent metal ion.