Highly Pigmented Colorantsfor

UV/EB

Guidelines For Use

262 Carlton Drive • Carol Stream, IL 60188 • Tel: 800.644.6784 • www.centchem.com

Highly Pigmented Colorantsfor Radiation Cured Printing Applications

Introducing

Yellow 14

Lithol Rubine 57:1

Phthalo Blue 15:4

Black 7

White

DPP Red

Warm Red 48:1

Green 7

Reflex Blue

Violet 23

Yellow 74

Quinacridone Red 122

Yellow 139

Red 170

262 Carlton Drive • Carol Stream, IL 60188 • Toll Free: 800-644-6784 • www.centchem.com

Introduction

As part of our commitment to bring value solutions to the market, Central Chemical & Servicewould like to present our new range of easily dispersible products designed to bring value inuse in the manufacture of UV/EB curable printing inks. In this technical bulletin we are introducinga range of fourteen pigment colorants for use in radical curable printing applications. Thefollowing information and formulas can also be used as a guideline for ink formulations whenusing other colorants in our product line.

The colorants have been specifically formulated to ensure that they offer the ink makermaximum formulation flexibility and ease of processing.The specific selection of the polyester acrylate oligomer backbone allows for letdownvariations into flexo, offset and screen formulations.

We will also custom formulate or consult on let down packages designed for use with RadFlexcolorants for specific print applications in Flexo and Screen printing.

Key Benefitshigh pigmentation

--

stir in dispersibility- ease of handling- high mileage and high gloss- multipurpose

formulated for use in flexo, offset and screen- excellent storage stability

Product Overview

Colorant Chromophore ViscosityPa.s*

Dispersionm

Pigmentations%

Yellow 14 PY 14 43 < 10 30

Lithol Rubine PR 57:1 31 < 10 30

Phthalo Blue PB 15:4 33 < 10 35

Violet PV 23 48 < 10 30

Black PB 7 37 < 10 40

White PW 6 38 < 10 65

* low shear viscosity measurement at 10s-1.

Guidelines for Use / Start Point Formulations

Flexographic InksThe following formulations were used to let down RadFlex colorants for use inflexographic printing.Central Chemical will also custom blend or consult on let down packages designed for use withRadFlex colorants for specific print applications or substrates.

Yellow Magenta Cyan Violet Black WhiteColorant 50.0 46.7 40.0 46.7 50.0 61.5LetdownPolyester OligomerGPTATMPEOTAIRGASTAB UV10

0.032.07.01.0

0.034.77.61.0

6.734.77.61.0

0.034.77.61.0

2.729.86.51.0

11.213.42.91.0

Photoinitiator Blend 10.0 10.0 10.0 10.0 10.0 10.0

GPTA - propylated glycerol triacrylateTMPEOTA - ethoxylated trimethylpropane triacrylate

Photoinitiator Blends% Colours Black White

DAROCUR EDBDAROCUR ITXIRGACURE 651IRGACURE 379IRGACURE 907IRGACURE 2022

27.527.534.011.0

--

-25.0

--

75.0-

-----

100

Final Ink Formulations

Yellow Magenta Cyan Violet Black WhitePigmentationPolyester AcrylateGPTATMPEOTAIRGASTAB UV10Photoinitiator Blend

14.036.032.07.01.0

10.0

14.032.734.77.61.0

10.0

14.032.734.77.61.0

10.0

14.032.734.77.61.0

10.0

20.032.729.86.51.0

10.0

40.032.713.42.91.0

10.0

ProcedureA letdown formulation is prepared by dissolving the appropriate weights of photoinitiators andstabilizer in the GPTA monomer. Heat is used to aid dissolution, and on completion theletdown is cooled to room temperature.The colorant is added to a pot along with the additional oligomer and letdown solution. Abutterfly impeller is then used to mix the components until a homogeneous final ink wasobtained ( approximately 5 minutes at a tip speed of ~ 3.5 m/s ).

Guidelines for Use / Start Point Formulations

Flexographic Ink Results

Colorant Pigmn

( % )Viscosity

( Pa.s )Density @( 1.0 g/m2 )

Gloss( 60o )

Stability( weeks )

Yellow14.0 3.0 1.4 75 > 4

Magenta 14.0 0.6 1.5 65 > 4

Cyan 14.0 0.8 1.6 65 > 4

Violet 14.0 2.7 1.3 64 > 4

Black 20.0 1.6 1.8 52 > 4

White 40.0 0.2 - 69 > 4

Methods of Assessment

Viscosity - Cone & Plate Controlled Stress RheometerViscosity measured at shear rate of 10s-1

Density - Prufbau print, metal cone, 500N, 1.0ms-1, 25oCPrinted on Top Coated White Polyethylene substrate at 1.0 g/m2

Gloss - Mini Glossmaster / 60o

Stability - Inks are filled to the brim in polypropylene containers and placed in anoven calibrated at 60oC. Inks are assessed on a weekly basis, for amaximum of 4 weeks, for premature curing.

Offset Inks

Starting Point Formulations – Porous SubstratesThe following formulations were used to let down RadFlex colorants for use in offsetlithography.

Black Cyan Magenta YellowColorant 45-50 55-60 55-60 55-60Ebecryl 846 25-30 15-20 15-20 15-20Ebecryl 3701 5-10 5-10 5-10 5-10Inert filler 3-5 3-5 3-5 3-5TRPGDA 2-3 2-3 2-3 2-3ViaCure DX 8-10 8-10 8-10 8-10

Starting Point Formulations – Non- Porous Substrates

Black Cyan Magenta YellowColorant 45-50 55-60 55-60 55-60ViaSet 212 31-36 24-30 24-30 24-30Inert filler 4-6 2-4 2-4 2-4TRPGDA 2-3 2-3 2-3 2-3ViaCure DX 8-10 8-10 8-10 8-10

The above recommendations were formulated and tested by Cytec Surface Specialtiesfor tack, gloss, viscosity and density to meet the requirements for offset lithography.

Colorant % 45 50 55 60(pigment solids)Black (40) 18 20Cyan (35) 19.2 21Magenta (30) 16.5 18Yellow (30) 16.5 18

Guidelines for Use / Start Point Formulations

Offset Inks

The following formulations were used to let down RadFlex colorants for use in offsetlithography.

Yellow Magenta Cyan Violet Black WhiteColorant 50.0 46.7 40.0 46.7 50.0 61.5LetdownPolyester OligomerGPTAIRGASTAB UV10

24.015.01.0

27.315.01.0

34.015.01.0

27.315.01.0

24.015.01.0

12.515.01.0

Photoinitiator Blend 10.0 10.0 10.0 10.0 10.0 10.0

GPTA - propylated glycerol triacrylate

Photoinitiator Blends

% Colours Black WhiteDAROCUR EDBDAROCUR ITXIRGACURE 651IRGACURE 379IRGACURE 907IRGACURE 2022

27.527.534.011.0

--

-25.0

--

75.0-

-----

100

Final Ink Formulations

Yellow Magenta Cyan Violet Black WhitePigmentationPolyester AcrylateGPTAIRGASTAB UV10Photoinitiator Blend

14.060.015.01.0

10.0

14.060.015.01.0

10.0

14.060.015.01.0

10.0

14.060.015.01.0

10.0

20.054.015.01.0

10.0

40.034.015.01.0

10.0

ProcedureA letdown formulation is prepared by dissolving the appropriate weights of photoinitiators andstabilizer in the GPTA monomer. Heat is used to aid dissolution, and on completion theletdown is cooled to room temperature.The colorant is added to a pot along with the additional oligomer and letdown solution. Abutterfly impeller is then used to mix the components until a homogeneous final ink wasobtained (approximately 5 minutes at a tip speed of ~ 3.5 m/s ).

Guidelines for Use / Start Point Formulations

Offset Ink Results

Colorant Pigmn

( % )Viscosity

( Pa.s )Tack Density @

( 1.0 g/m2 )Gloss( 60o )

Stability( weeks )

Yellow14.0 7 20.0 1.3 71 > 4

Magenta 14.0 9 22.1 1.3 69 > 4

Cyan 14.0 15 23.2 1.6 56 > 4

Violet 14.0 11 20.2 1.5 62 > 4

Black 20.0 7 21.7 1.5 > 4

White 40.0 2 12.5 - > 4

Offset prints are illustrated at the end of this document

Methods of Assessment

Viscosity - Cone & Plate Controlled Stress RheometerViscosity measured at shear rate of 10s-1

Tack - Beta Tech Tack Meter

Gloss - Mini Glossmaster / 60o

Density - Prufbau print, metal cone, 1200N, 0.5ms-1, 25oCPrinted on APCO II/II substrate at 1.0 g/m2

Stability - Inks are filled to the brim in polypropylene containers and placed in anoven calibrated at 60oC. Inks are assessed on a weekly basis, for amaximum of 4 weeks, for premature curing.