	US 12,084,578 B2
	Radiation-curable compositions of pigment violet 23 with improved removability from surfaces, method of making a radiation-curable composition and ink containing a radiation-curable composition
Thomas Paul, Heidelberg (DE); Peter Hachmann, Weinheim-Hohensachsen (DE); Christoph Michel, Darmstadt (DE); and Els Mannekens, Jette (BE)
Assigned to Heidelberger Druckmaschinen AG, Heidelberg (DE)
Filed by HEIDELBERGER DRUCKMASCHINEN AG, Heidelberg (DE)
Filed on Aug. 28, 2020, as Appl. No. 17/005,979.
Claims priority of application No. 102019213111 (DE), filed on Aug. 30, 2019.
Prior Publication US 2021/0062005 A1, Mar. 4, 2021
Int. Cl. C09B 19/02 (2006.01); C09D 11/101 (2014.01); C09D 11/322 (2014.01)

CPC C09B 19/02 (2013.01) [C09D 11/101 (2013.01); C09D 11/322 (2013.01)]

6 Claims

1. A radiation-curable composition, comprising:

a) at least one Pigment Violet 23, containing at least one functional group of formula (I)

—X-E (I)

where:

X is a bridging group selected from phenylene or methylenephenylene; and

E is a polar molecule radical which is bonded to the Pigment Violet 23 via the bridging group X;

wherein E is

(Z)_m(A)_n

where:

Z is at least one polar functional group selected from at least one sulfonate radical, carboxylate radical or phosphonate radical;

A is a short-chain apolar molecule radical or a countercation selected from at least one proton, alkali metal cation, alkaline earth metal cation or an ammonium ion;

m is 1 or 2; and

n is 1, 2, 3 or 4;

b) at least one dispersant; and

c) a nonaqueous dispersion medium.