Sakata Inx Corporation

Shinya Mizutani

Takuya Myose

Tadashi Hirose

Taichi Ono

Tatsuro Tsuchiya

Provided is an ink set having excellent curing properties under LED light, providing printed matter that does not fade or discolor due to a photopolymerization initiator, suppressing color bleeding during image forming, exhibiting favorable adhesion towards a polyvinyl chloride sheet, enabling cock ring to be efficiently suppressed, and demonstrating an extremely low viscosity, high flash point and low skin irritation. The present invention pertains to an ink set containing at least two compositions selected from the group consisting of a yellow ink composition, a magenta ink composition, a cyan ink composition, a black ink composition, a white ink composition, and a clear ink composition, the compositions having the predetermined structure as specified in claim, wherein the flash point of the ink compositions is 70&#xb0; C. or higher, and the viscosity (25&#xb0; C.) is 5 mPa-s or lower.

Ink set and printed material

Provided is a photocurable ink composition for inkjet printing which is favorably cured with light from a light-emitting diode (LED), favorably adheres to a polyvinyl chloride sheet such as a tarpaulin and a vinyl chloride resin sheet, suppresses the occurrence of cockling, and has both safety and favorable ejection stability at room temperature when ejected from an inkjet head for low-viscosity ink, and a printed material. The present invention is a photocurable ink composition for inkjet printing containing photopolymerizable compounds and a photopolymerization initiator. The photopolymerizable compounds are vinyloxyethoxyethyl acrylate and benzyl acrylate, and contained in specific amounts. The photopolymerization initiator is a compound that expresses an initiator function when irradiated with light having a wavelength within the range of 450 to 300 nm. The photocurable ink composition has a flash point of 70&#xb0; C. or higher and a viscosity at 25&#xb0; C. of 5 mPa&#xb7;s or lower, and further contains 50% by mass or more of a monofunctional monomer.

Photocurable ink composition for injet printing and printed material

A photocurable ink composition for inkjet printing is obtained that has superior curability with respect to light from a light-emitting diode, has favorable adhesion to a polyvinyl chloride-based sheet, and is able to adequately inhibit the occurrence of cockling. The photocurable ink composition for inkjet printing at least has: a photopolymerizable compound; a photopolymerization initiator; and a sensitizer, wherein benzyl acrylate, N-vinylcaprolactam and an acrylated amine compound having two photopolymerizable functional groups and two amino groups in a molecule thereof are contained as the photopolymerizable compound, the content of the benzyl acrylate is 20 to 65% by mass in the photocurable ink composition for inkjet printing, a compound exhibiting an initiator function when irradiated with light having a wavelength of 450 to 300 nm is contained as the photopolymerization initiator, a compound exhibiting a sensitizer function when irradiated with light having a wavelength of 400 nm or longer is contained as the sensitizer, and a flash point as measured using a SETA closed-cup flash point tester according to a method in compliance with JIS K2265 is 70&#xb0; C. or higher.

Photocurable ink composition for inkjet printing, and printed material

A photocurable inkjet printing ink composition includes at least a photopolymerizable compound component and a photopolymerization initiator, wherein in the photopolymerizable compound component, a monofunctional monomer is included in a content of 91.0 to 99.5% by mass and a multifunctional monomer is included in a content of 0.5 to 9.0% by mass; in the monofunctional monomer component, acryloylmorpholine is included in a content of 30.0 to 85.0% by mass; the monofunctional monomer component includes at least one selected from benzyl acrylate, ethyl carbitol acrylate, tetrahydrofurfuryl acrylate and phenoxyethyl acrylate in a content of 5.0 to 40.0% by mass in the monofunctional monomer component; and the stretching rate at 180&#xb0; C. of the cured coating obtained by photopolymerizing the photocurable inkjet printing ink composition is 120% or more.

Growing community of inventors

Osaka, Japan

Shinya Mizutani