Solvent for ink, method for producing solvent for ink, ink for inkjet recording, method for producing ink for inkjet recording, ink cartridge, and method for producing ink cartridge
View Patent ↗An ink vehicle having a vinyl chloride-vinyl acetate copolymer resin produced by suspension polymerization. In the production of the ink vehicle, the vinyl chloride-vinyl acetate copolymer resin is partially dissolved in a solvent in a state in which an undissolved gel-like component of the vinyl chloride-vinyl acetate copolymer resin is present in the resin. An external force is applied to the solvent containing the gel-like component to dissolve the gel-like component in the solvent.
1. A production method for a vehicle for an ink comprising a vinyl chloride-vinyl acetate copolymer resin dissolved as a binder resin in a solvent, the vinyl chloride-vinyl acetate copolymer resin being produced by suspension polymerization, the method comprising:
a pre-dissolving step of partially dissolving the vinyl chloride-vinyl acetate copolymer resin produced by the suspension polymerization in the solvent to such a state that an undissolved gel-like component thereof is incorporated; and
a gel-like component-dissolving step of applying an external force to the solvent containing the gel-like component to dissolve the gel-like component in the solvent.
2. A production method for a vehicle for an ink according to claim 1 ; wherein the external force of the gel-like component-dissolving step comprises acoustic wave irradiation generated by an acoustic wave irradiation apparatus.
3. A production method for a vehicle for an ink according to claim 1 ; wherein the external force of the gel-like component-dissolving step comprises ultrasonic wave irradiation generated by an ultrasonic wave irradiation apparatus.
4. A production method for a vehicle for an ink according to claim 1 ; wherein the external force of the gel-like component-dissolving step comprises media dispersion by a media disperser.
5. A production method for a vehicle for an ink according to claim 1 ; wherein the pre-dissolving step comprises stirring the vehicle with a stirring machine while heating the vehicle to partially dissolve in the solvent the vinyl chloride-vinyl acetate copolymer resin produced by the suspension polymerization.
6. A production method for a vehicle for an ink according to claim 1 ; wherein the vinyl chloride-vinyl acetate copolymer resin has a molecular weight of 20,000 to 30,000.
7. A production method for a vehicle for an ink according to claim 1 ; wherein a water-soluble resin remains in the vinyl chloride-vinyl acetate copolymer resin.
8. A production method for an ink for inkjet recording, comprising: adding an ink vehicle produced by the production method according to claim 1 to a pigment dispersion having at least a pigment and a pigment dispersant.
9. A production method for an ink cartridge, comprising the steps of: storing in a pouch an ink for inkjet recording produced by the production method for an ink for inkjet recording according to claim 1 ; and storing the pouch in a case.
10. An ink for inkjet recording, comprising: an ink vehicle produced by the production method according to claim 1 ; a pigment; and a pigment dispersant.
11. An ink cartridge, comprising: a pouch storing an ink for inkjet recording according to claim 10 ; and a case for storing the pouch.
12. A vehicle for an ink, comprising: a vinyl chloride-vinyl acetate copolymer resin that is produced by suspension polymerization and that is dissolved in a solvent in a state in which an undissolved gel-like component present in the solvent is dissolved in the solvent by application of an external force to the solvent.
13. A vehicle for an ink according to claim 12 ; wherein the vinyl chloride-vinyl acetate copolymer resin contains a water-soluble resin.
14. An ink for inkjet recording, comprising: an ink vehicle according to claim 12 ; a pigment; and a pigment dispersant.
15. An ink cartridge, comprising: a pouch storing an ink for inkjet recording according to claim 14 ; and a case for storing the pouch.
16. An ink cartridge storing an ink for inkjet recording according to claim 15 .
17. A method of producing an ink vehicle, comprising:
producing a vinyl chloride-vinyl acetate copolymer resin by suspension polymerization;
partially dissolving the produced vinyl chloride-vinyl acetate copolymer resin in a solvent in a state in which an undissolved gel-like component of the vinyl chloride-vinyl acetate copolymer resin is present in the resin; and
applying an external force to the solvent containing the gel-like component to dissolve the gel-like component in the solvent.
18. A method according to claim 17 ; wherein the applying step comprises applying the external force using ultrasonic wave irradiation.
19. A method according to claim 17 ; wherein the applying step comprises applying the external force by media dispersion.
20. A method according to claim 17 ; wherein the partially dissolving step comprises stirring the vehicle with a stirring machine while heating the vehicle to partially dissolve in the solvent the vinyl chloride-vinyl acetate copolymer resin.