JPWO2021122574A5

JPWO2021122574A5 -

Info

Publication number: JPWO2021122574A5
Application number: JP2022536615A
Authority: JP
Publication date: 2023-11-24

Claims

2. at 40° C. and 1000 s ⁻¹ to offset print features on the substrate. A UV-LED radical-curable offset printing ink having a viscosity in the range of 5 to 25 Pa s, said UV-LED radical-curable offset printing ink comprising:
i ) 10wt . % ~80wt . % of one or more radically curable (meth)acrylate oligomers and one or more radically curable (meth)acrylate monomers,
The radical curable (meth)acrylate oligomer is epoxy (meth)acrylate, (meth)acrylated oil, (meth)acrylated epoxidized oil, polyester (meth)acrylate, aliphatic or aromatic polyurethane (meth)acrylate, selected from the group consisting of polyacrylic acid (meth)acrylate, polyacrylate ester (meth)acrylate, and mixtures thereof;
The radically curable (meth)acrylate monomer is mono(meth)acrylate, di(meth)acrylate, tri(meth)acrylate, tetra(meth)acrylate, penta(meth)acrylate, hexa(meth)acrylate, and mixtures thereof. one or more radically curable (meth)acrylate compounds selected from the group consisting of ii ) 4 wt. % ~20wt . % of one or more photoinitiators of formula (I):

[wherein Q has the following formula (IIa), (IIb) or (IIc):

(wherein n is 1 or more, R1 are the same or different from each other and are selected from the group consisting of hydrogen and C ₁ -C ₃ alkyl groups, and R 2 consists of hydrogen and C ₁ -C ₃ alkyl groups) selected from the group, the sum of a+b+c is 3 to 12 and the sum of d+e+f+g is 4 to 16)]
iii) selected from the group consisting of aminobenzoate compounds having a weight average molecular weight of at least 400 g/mol eq PS, amine-modified polyether-based acrylates having a weight average molecular weight of at least 400 g/mol eq PS, and combinations thereof , 1 wt. % ~ 15wt. % of one or more amino-containing compounds, and iv ) 1 wt. % ~30wt . % of one or more inorganic pigments and/or one or more organic pigments, and v) carbon fibers, talc, mica, wollastonite, clays, kaolin, carbonates, silicates, sulfates, titanates. , alumina hydrate, silica, montmorillonite, graphite, bentonite, vermiculite, wood flour, quartz powder, natural fibers, synthetic fibers, and combinations thereof . 5wt. % ~10wt . % of one or more fillers and/or extenders, the weight percentages being based on the total weight of the UV-LED radical curable offset printing ink.

The one or more photoinitiators are of formula (I) and Q is of formula (IIb-1), (IIb-2) or (IIb-3):

(where n is equal to 1, 2 or 3 and the sum of a+b+c is 3 to 12)
The UV-LED radical curable offset printing ink according to claim 1, comprising:

The one or more amino-containing compounds are from aminobenzoate compounds having a weight average molecular weight of at least 700 g/mol eq PS, amine-modified polyether-based acrylates having a weight average molecular weight of at least 700 g/mol eq PS, and combinations thereof. The UV-LED radical curable offset printing ink according to claim 1 or 2, selected from the group consisting of:

UV-LED radical curable offset printing ink according to any one of claims 1 to 3, wherein the one or more amino-containing compounds are selected from the group consisting of amino-containing compounds including aminobenzoate compounds.

The one or more amino-containing compounds have the formula (III):

(In the formula, m is greater than 1, and the sum of h+i+j+k is 3 to 12)
5. The UV-LED radical curable offset printing ink according to claim 4, selected from the group consisting of aminobenzoate compounds having:

Any one of claims 1 to 5, wherein the one or more inorganic pigments and the one or more organic pigments independently have a particle size of 5 μm or less when measured using a particle size analysis gauge. The UV-LED radical curable offset printing ink described in .

Any one of claims 1 to 6, further comprising one or more waxes selected from the group consisting of paraffin wax, polyethylene wax, fluorocarbon wax, polytetrafluoroethylene wax, carnauba wax, and mixtures thereof. The UV-LED radical curable offset printing ink described in 2.

A method for printing features on a substrate by an offset printing method, the method comprising:
a) applying the UV-LED radical curable offset printing ink according to any one of claims 1 to 7 by offset printing to form an ink layer, and b) the ink at a dose of at least 150 mJ/ ^cm2 . A method comprising exposing a layer to UV light and curing said ink layer with a UV-LED source.

9. The method of claim 8, wherein step b) consists of exposing the ink layer to one or more wavelengths from 355 nm to 415 nm.

2 at 40°C and 1000 s ^-1 . 4 wt. to produce a UV-LED radical curable offset printing ink with a viscosity in the range of 5 to 25 Pa s. % ~20wt . % of one or more photoinitiators according to claim 1 or 2, and 1 wt. % ~ 15wt. % of one or more amino-containing compounds according to claim 1, 3, 4 or 5 ,
The UV-LED radical curable offset printing ink is suitable for printing one or more features on a security document, and the UV-LED radical curable offset printing ink has an amount of 10 wt. % ~80wt . % radically curable (meth)acrylate compound , 1 wt. % ~30wt . % of one or more inorganic pigments and/or one or more organic pigments and 0 . 5wt. % ~10wt . % of one or more fillers and/or extenders, the weight percentages being based on the total weight of the UV-LED radical curable offset printing ink.

A printed feature comprising an ink layer that is a cured product of the UV-LED radical-curable offset printing ink according to any one of claims 1 to 7.

A security document comprising a substrate and one or more printed features according to claim 11.

13. The security document of claim 12, wherein the one or more printed features have a total surface of 50 % or more , where % is based on the total surface of the substrate on which the one or more printed features are present. .

The security document according to claim 12 or 13, wherein the substrate is a non-fluorescent substrate.