Ink composition and inkjet recording method
An ink composition and an inkjet recording method, which can realize low-temperature and high-speed fixing of a high-quality image and ensure excellent offset resistance and blocking resistance, are provided, and the ink composition comprises a dispersion medium and a charged particle containing at least a coloring material, wherein the charged particle contains at least one of a copolymer having a polyester structure and a polymer having a liquid crystalline structure.
1 . An ink composition comprising a dispersion medium; and a charged particle containing at least a coloring material, wherein said charged particle contains at least one of a copolymer having a polyester structure and a polymer having a liquid crystalline structure.
2 . The ink composition according to claim 1 , wherein said charged particle contains the copolymer having a polyester structure.
3 . The ink composition according to claim 2 , wherein the copolymer having a polyester structure has a structural unit represented by the following formula (A) or (B):
wherein R 1 to R 3 each independently represents a divalent hydrocarbon group having from 1 to 20 carbon atoms, and the hydrocarbon group may contain an ether bond, an amino group, a hydroxy group or a halogen substituent, n is an integer of 2 or more.
4 . The ink composition according to claim 2 , wherein the polyester structure has a melting point (Tm).
5 . The ink composition according to claim 4 , wherein the melting point of the polyester structure is from 20 to 120° C.
6 . The ink composition according to claim 1 , wherein said charged particle contains the polymer having the liquid crystalline structure.
7 . The ink composition according to claim 6 , wherein the polymer having the liquid crystalline structure contains a polymer side chain having a structure represented by the following formula (I):
—X—Ar—Y—Ar—Z (I)
wherein X represents a single bond or a divalent linking group to the polymer main chain skeleton, Ar represents a divalent aromatic hydrocarbon group which may have a substituent, Y represents a divalent linking group for linking two Ar groups, and Z represents a subslituent of the adjacent Ar group.
8 . An inkjet recording method comprising flying an ink composition as an ink droplet by an inkjet recording system using an electrostatic field, wherein the ink composition comprises: a dispersion medium; and a charged particle containing at least a coloring material, and said. charged particle contains at least one of a copolymer having a polyester structure and a polymer having a liquid crystalline structure.