Cationic Polymerization Ink

• US 20110190418A1
• Filed: 01/31/2011
• Published: 08/04/2011
• Est. Priority Date: 02/03/2010
• Status: Abandoned Application

• Current Assignee: Brother Kogyo Kabushiki Kaisha (Brother Industries Limited)
• Original Assignee: Brother Kogyo Kabushiki Kaisha (Brother Industries Limited)
• Inventors: NARUSE, Atsushi, MIURA, Yuki, NOGUCHI, Akiko
• Application Number:
  US13/017,288
• Publication Number:
  US 20110190418A1
• Time in Patent Office: Days
• US Class Current: 523/400
• CPC Class Codes: C09D 11/101 Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
• CPC Class Codes: C09D 11/324 containing carbon black

Abstract

A cationic polymerization ink that can be hardened by cationic polymerization, includes monomers. The monomers include an epoxy monomer having an epoxy group as a functional group and an oxetane monomer having an oxetane group as the functional group. The monomers include a monofunctional monomer having one functional group and a polyfunctional monomer having at least two functional groups. A total functional group equivalent weight, which is a total of a functional group equivalent weight of the monofunctional monomer and a functional group equivalent weight of the polyfunctional monomer, is not less than 130 and not greater than 144. A ratio of the functional group equivalent weight of the polyfunctional monomer to the total functional group equivalent weight is not less than 23 percent and not greater than 38 percent.

Claims

1. A cationic polymerization ink that can be hardened by cationic polymerization, comprising monomers, wherein:

the monomers include an epoxy monomer and an oxetane monomer, the epoxy monomer being a monomer having an epoxy group as a functional group, and the oxetane monomer being a monomer having an oxetane group as the functional group;

the monomers include a monofunctional monomer having one functional group and a polyfunctional monomer having at least two functional groups;

a total functional group equivalent weight is not less than 130 and not greater than 144, the total functional group equivalent weight being a total of a functional group equivalent weight of the monofunctional monomer and a functional group equivalent weight of the polyfunctional monomer; and

a ratio of the functional group equivalent weight of the polyfunctional monomer to the total functional group equivalent weight being not less than 23 percent and not greater than 38 percent.

2. The cationic polymerization ink according to claim 1, wherein

a ratio of a weight of the epoxy monomer to a total weight of the epoxy monomer and the oxetane monomer is not less than 40 percent and not greater than 90 percent.

3. The cationic polymerization ink according to claim 1, further comprising a polymerization initiator that initiates polymerization of the monomers.

4. The cationic polymerization ink according to claim 1, wherein

a pencil hardness of the cationic polymerization ink is not less than HB in a case where the cationic polymerization ink is hardened by irradiation with ultraviolet light under a condition that a cumulative amount of light is 500 mJ/cm².