highly pigmented colorants for uv/eb - centchem.com pigmented colorants for uv/eb ... and formulas...
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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.