TB EFKA-4340 - Tecmos

TECHNICAL BULLETIN
EFKA ® 4340
Your value improver for high performance pigments
Introduction
Polymeric pigment dispersant are an indispensable class of additives to
realize high-quality of pigment dispersions for use in modern paints.
A uniform and stable pigment dispersion is necessary to achieve good
colouristic properties and high gloss of the coating. In addition, well-selected
pigment dispersants can contribute to increased production economics by
allowing higher pigment loading and faster grinding process.
Polymeric architecture and the type of pigment affinic anchoring groups are
key parameters in the dispersant performance. Only very recently has the
novel pioneering technique of “controlled free radical polymerization” (CFRP)
been commercialized in the field of pigment dispersants.
The latest development in CFRP is EFKA ® 4340, a new addition to the range
of controlled free radical polymers based on block acrylate copolymers,
introduced two years ago.
Application field
EFKA ® 4340 is designed for usage in solvent-based high-end performance
coatings systems like automotive OEM and refinish. EFKA ® 4340 has an
improved pigment affinity and stability for organic pigments, especially where
high transparency is required and is highly suitable for CAB-containing baseand
topcoats used in this area.
Properties
EFKA ® 4340 is making use of new developed special aromatic anchoring
groups in addition to common amino groups. This results in block copolymer
dispersants, which are tailor-made for non-polar organic pigments.
EFKA ® 4340:
- improves colour development with organic pigments
- improves transparency
- improves viscosity reduction at high concentrations of pigments in the
grinding stage
- has excellent compatibility with CAB-containing base-coat systems
- gives excellent gloss
Content of this issue:
Editorial:
Editor:
April 2005
• Introduction 1
• Application field 1
• Properties 1
• Data 2
• Pigment recommendations 2
• Application tests 2
• Tested properties 2
• Let down systems 2
• Tested pigments 2
• Optimum amount dispersant on
pigment 3
• Gloss pour out @ 20° 3
• Chroma versus Hue 3
• Transparency 4
• Colour strength 4
Manfred Jorna
Business Development
Manager for Coatings
EFKA Additives BV
P.O. Box 571
8440 AN Heerenveen
The Netherlands
Phone: +31 513 657 500
Fax: +31 513 657 550
www.efka.com
efka@efka.com

Data
Active ingredients 53 - 57%
Solvent methoxypropanol
Amine value 2.5 - 5.5 KOH/g DIN 16945
Colour max. 8 ISO 4630
Appearance clear yellow to brownish liquid
Pigment recommendations
Application tests on EFKA ® 4340
Organic pigments
Blue, green, violet 25% of BET value
Red, orange, yellow 50% of BET value
Carbon black
LCF 20% of DBP absorption value
HCC 40% of DBP absorption value
EFKA ® 4340 has been tested in its application in comparison to some state of the art commercial available
dispersants in resin free pigment concentrates. In resin free mill bases, the performance requirements of the
dispersant is most demanding, as the pigment stabilisation solely depends on the dispersant without additional
support of a grinding resin.
We do not rule out the use of EFKA ® 4340 in combination with a grinding resin.
Tested properties
Optimum amount of dispersant on pigment
Gloss @ 20° of pour outs
Chroma versus Hue
Transparency
Colour strength
Let down systems Tested pigments
CAB/Acrylic Ciba ® Cromopthal ® Blue A 3 R (PR 60)
Acrylic/Melamine (OEM) Ciba ® Irgazin ® DPP Rubine TR (PR 264)
2 pack Acrylic
EFKA ® 4340

Viscosity mPas
Gloss 20°
Chroma
5000
4000
3000
2000
1000
0
50
40
30
20
10
0
50% 70% 90% 110% 130%
Percentage dispersant on pigment
150%
34.4
34.2
34
33.8
33.6
33.4
33.2
33
Ciba ® Cromophtal ® Blue A 3 R
(25% pigment) PB 60
(shear rate 100 s -1 )
50% 70% 90% 110% 130% 150%
Percentage dispersant on pigment
Ciba ® Cromophtal ® Blue A 3 R
PB 60 in CAB/PU
Pour outs diluted paint
Ciba ® Cromophtal ® Blue A 3 R
PB 60 in white OEM
(10:90 TiO 2 white reduction)
32.8
269.05 269.1 269.15 269.2 269.25 269.3 269.35 269.4 269.45
Green Hue Red
Optimum amount of dispersant on pigment
EFKA-4340
Competitor 1
Competitor 2
Gloss of pour outs in CAB/Acrylic @ 20°
EFKA-4340
Competitor 1
Competitor 2
Chroma versus Hue
EFKA-4340
Competitor 1
Competitor 2
Viscosity mPas
Gloss 20°
Chroma
5200
4800
4400
4000
3600
3200
2800
2400
2000
1600
EFKA ® 4340
1200
20% 40% 60% 80% 100% 120%
Percentage dispersant on pigment
100
80
60
40
20
0
20% 40% 60% 80% 100% 120%
4
3.5
3
2.5
2
1.5
Ciba ® Irgazin ® DPP Rubine TR
(20% pigment) PR 264
(shear rate 100 s -1)
Ciba ® Irgazin ® DPP Rubine TR
PR 264 in CAB/PU
Pour outs diluted paint
Percentage dispersant on pigment
Ciba ® Irgazin ® DPP Rubine TR
PR 264 in white OEM
10:90 TiO 2 white reduction)
39.6 39.8 40 40.2 40.4 40.6 40.8 41 41.2 41.4 41.6
Blue Hue Yellow

Color strength
Differences Transparency
112
110
108
106
104
102
100
98
0.12
0.1
0.08
0.06
0.04
0.02
0
Ciba ® Cromophtal ® Blue A 3 R
in CAB/Acrylic
Competitor 2 is reference
EFKA-4340 Competitor 1 Competitor 2
Comp 1 EFKA ® 4340
Ciba ® Cromophtal ® Blue A 3 R
in white Acrylic/Melamine
(10:90 TiO 2 white reduction)
Competitor 2 is reference (100%)
EFKA ® 4340 Competitor 1 Competitor 2
Transparency
Differences Transparency
Color strength
2.5
2
1.5
1
0.5
Colour strength
EFKA ® 4340
0
110
108
106
104
102
100
98
96
94
92
90
Ciba ® Irgazin ® DPP Rubine TR
in CAB/Acrylic
Competitor 2 is reference
EFKA-4340 Competitor 1 Competitor 2
Comp 1 EFKA ® 4340
Ciba ® Irgazin ® DPP Rubine TR
in white Acrylic/Melamine
10:90 TiO 2 white reduction)
Competitor 2 is reference (100%)
EFKA ® 4340 Competitor 1 Competitor 2