Actinic energy radiation curable inkjet ink and inkjet recording method
Disclosed is an actinic energy radiation curable inkjet ink which can be printed on various types of recording media, has excellent printed image quality and excellent fixability particularly on coated printing paper, and is improved in storage stability and ejection stability. Also disclosed is an inkjet recording method using the actinic energy radiation curable inkjet ink. The actinic energy radiation curable inkjet ink is characterized by containing a compound represented by Formula (1) or a compound represented by Formula (2) in an amount of not less than 0.1% by mass and less than 20% by mass based on a total mass of the ink.
1. An actinic energy radiation curable inkjet ink comprising a compound represented by Formula (1) or a compound represented by Formula (2) in an amount of not less than 0.1% by mass and less than 20% by mass based on a total mass of the ink,
wherein R 1 and R 2 each represents a linear, a branched or a cyclic alkyl group, or a linear, a branched or a cyclic alkenyl group; A represents a linear or a branched alkyl group having a carbon number of 1 to 4, or a benzyl group,
wherein R 1 and R 4 each represents a linear or a branched alkyl group, or a linear or a branched alkenyl group; R 2 represents a linear alkylene group having a carbon number of 1 to 5; R 3 represents a linear alkyl group having a carbon number of 1 to 5.
2. The actinic energy radiation curable ink-jet ink of claim 1 ,
wherein A in Formula (1) is at least one group selected from methyl group, isopropyl group, isobutyl group, sec-butyl group and benzyl group.
3. The actinic energy radiation curable inkjet ink of claim 1 ,
wherein an end of R 1 and R 2 each in Formula (1) is a vinyl group or a methyl group, and
other than the ends, each of R 1 and R 2 comprises a linear saturated alkyl group having carbon numbers of 2 to 30.
4. The actinic energy radiation curable inkjet ink of claim 1 , wherein R 2 in Formula (2) is a tetramethylene group, and
R 1 and R 4 each is a linear alkyl group having carbon numbers of 2 to 30, and
the end thereof is a vinyl group or a hydrogen atom.
5. The actinic energy radiation curable inkjet ink of claim 1 , comprising a pigment as a colorant.
6. The actinic energy radiation curable inkjet ink of claim 1 , wherein the ink changes a sol-gel phase transition reversibly according to a temperature, and the sol-gel phase transition temperature is not less than 30° C. and less than 100° C.
7. An inkjet recording method for recording an image comprising jetting the actinic energy radiation curable inkjet ink of claim 1 on a recording medium,
wherein the image is recorded under a condition of a difference of a temperature between the temperature of the actinic energy radiation curable inkjet ink in the recording head and the temperature of the recording medium being not less than 25° C. and less than 100° C.
8. The inkjet recording method of claim 7 , wherein the actinic energy radiation curable inkjet ink is heated in the recording head.
9. The inkjet recording method of claim 7 , wherein the image is recorded under heating the recording head in a range from not less than T+10° C. to less than T+40° C., wherein T(° C.) is the sol-gel phase transition temperature.