Photocurable inkjet printing ink composition and print

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 11/00 (2006.01) B41J 2/01 (2006.01) B41M 5/00 (2006.01) B41M 5/50 (2006.01) B41M 5/52 (2006.01)

Patent

CA 2726592

An object of the present invention is to provide a photocurable ink composition for ink-jet printing, which exhibits excellent curing properties in response to light from light emitting diodes (LEDs), is adhered well to a polyvinyl chloride sheet such as tarpaulin or a vinyl chloride resin sheet, can sufficiently reduce cockling, has a low viscosity but a high flash point, and can achieve both of good jetability at a normal temperature and good safety properties owing to these properties. The ink composition for ink-jet printing includes at least: photopolymerizable compounds; a photopolymerization initiator; and a sensitizer, and has a flash point of higher than 60°C when measured with a SETA closed-cup flash point tester by a method in accordance with JIS K2256. The photopolymerizable compounds include 2-methoxyethyl acrylate and/or 2-ethoxyethyl acrylate, and N-vinyl caprolactam, and an acrylated amine compound having two photopolymerizable functional groups and two amino groups in the molecule. The total amount of 2-methoxyethyl acrylate and/or 2-ethoxyethyl acrylate is 20 to 50% by mass of the photocurable ink composition for ink-jet printing. The photopolymerization initiator includes a compound that comes to function as an initiator in response to light having a wavelength of 450 to 300 nm. The sensitizer includes a compound that comes to function as a sensitizer in response to light having a wavelength of 400 nm or longer.

L'invention porte sur une composition photodurcissable d'encre d'impression par jet d'encre. La composition contient au moins des composés photopolymérisables, un initiateur de photopolymérisation et un sensibilisateur. Les composés photopolymérisables décrits ci-dessus comprennent l'acrylate de 2-méthoxyéthyle et/ou l'acrylate de 2-éthoxyéthyle, le N-vinylcaprolactame et un composé amine modifié par acrylate ayant deux groupes fonctionnels photopolymérisables et deux groupes amino par molécule ; la teneur totale de l'acrylate de 2-méthoxyéthyle et/ou de l'acrylate de 2-éthoxyéthyle tel que décrit ci-dessus s'élève à 20 à 50 % en masse dans la composition photodurcissable d'encre d'impression par jet d'encre telle que décrite ci-dessus ; l'initiateur de photopolymérisation décrit ci-dessus comprend un composé apte à présenter l'activité d'amorçage sous l'effet d'une lumière d'une longueur d'onde de 450 à 300 nm ; le sensibilisateur décrit ci-dessus comprend un composé apte à présenter l'activité de sensibilisation sous l'effet d'une lumière d'une longueur d'onde supérieure ou égale à 400 nm ; et le point d'éclair, mesuré conformément à la norme JIS K2256 avec un testeur de point d'éclair en coupelle fermée SETA, est supérieur à 60°C.

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