Radiation-curable ink jet composition and recording method
A radiation-curable ink jet composition comprises a polymerizable compound component including a monofunctional monomer component and a multifunctional monomer component. The content of the monofunctional monomer component is 87 mass % or more based on the polymerizable compound. The monofunctional monomer component includes a nitrogen-containing monofunctional monomer component, and the content of the nitrogen-containing monofunctional monomer component is 14 mass % or less based on total amount of the radiation-curable ink jet composition. The weighted average of the glass transition temperatures of homopolymers of the respective polymerizable compounds is 42° C. or more when the mass ratios of the contents of the respective polymerizable compounds are weighted.
1. A radiation-curable ink jet composition comprising:
a polymerizable compound component containing a monofunctional monomer component and a multifunctional monomer component,
wherein a content of the monofunctional monomer component is 87 mass % or more based on the total amount of the polymerizable compound component;
the monofunctional monomer component includes a nitrogen-containing monofunctional monomer component;
a content of the nitrogen-containing monofunctional monomer component is 14 mass % or less based on total amount of the radiation-curable ink jet composition;
the multifunctional monomer component includes a vinyl ether group-containing (meth)acrylic ester represented by the following formula (1):
CH 2 ═CR 1 —COOR 2 —O—CH═CH—R 3 (1)
(where, R 1 is a hydrogen atom or a methyl group, R 2 is a divalent C2-C20 organic residue, and R 3 is a hydrogen atom or a monovalent C1-C11 organic residue); and
a weighted average of glass transition temperatures of homopolymers of the respective polymerizable compounds is 42° C. or more when mass ratios of contents of the respective polymerizable compounds are weighted.
2. The radiation-curable ink jet composition according to claim 1 , wherein
the nitrogen-containing monofunctional monomer component includes a monomer having a nitrogen-containing heterocyclic structure.
3. The radiation-curable ink jet composition according to claim 1 , wherein
a content of the multifunctional monomer component is 1 to 10 mass % based on the total amount of the polymerizable compound component.
4. The radiation-curable ink jet composition according to claim 1 , wherein
the content of the nitrogen-containing monofunctional monomer component is 3 to 14 mass % based on the total amount of the radiation-curable ink jet composition.
5. The radiation-curable ink jet composition according to claim 1 , wherein
the nitrogen-containing monofunctional monomer component includes a nitrogen-containing monofunctional acrylate monomer.
6. The radiation-curable ink jet composition according to claim 1 , wherein
the nitrogen-containing monofunctional monomer component includes a nitrogen-containing monofunctional vinyl monomer.
7. The radiation-curable ink jet composition according to claim 1 , wherein
the monofunctional monomer component includes a monofunctional acrylate containing a polycyclic hydrocarbon group.
8. The radiation-curable ink jet composition according to claim 7 , wherein
a content of the monofunctional acrylate containing a polycyclic hydrocarbon group is 40 mass % or less based on the total amount of the radiation-curable ink jet composition.
9. The radiation-curable ink jet composition according to claim 1 , comprising:
a pigment.
10. A recording method comprising:
discharging the radiation-curable ink jet composition according to claim 1 from an ink jet head to adhere the composition to a recording medium; and
irradiating the radiation-curable ink jet composition adhered to the recording medium with radioactive rays.