leading the way - lambson ltd · 2019. 5. 1. · photoinitiators speedcure 73, 84, bp, itx have mws...
TRANSCRIPT
Leading the way
Photoinitiators for Low Migration Applications
Leading the wayWhat is Migration?
Substrate
Ink
Substrate
Ink
Substrate
Ink
Penetration Migration Contact/ Set off migration
Substrate
Ink
Evaporation Migration
Substrate
Ink
Condensation Migration
Leading the wayUV Energy Curing Formulation
Resins and Oligomers
Monomers and Diluents
Photoinitiators
Additives
100% solids formulation
Low migration potential: High acrylate functionality and molecular weight.
High migration potential:Low acrylate functionality and molecular weight.
Small molecules will readily migrate. Low migration photoinitiators can be used.
Many additives will readily migrate.Specialist low migration options may be available.
Leading the wayMigration from Photoinitiators
O
R R
CH3N(R)
2
OH
CH2N(R)
2
. .
Aryl aryl ketone Amine synergist Ketyl radicalinert
Alkylamino radicalreactive
O
OH
R
O
OH. .
Aryl alkyl ketone Benzoyl radical Alkyl radical
Type I photoinitiators
Type II photoinitiators
Fragments cause potential migration issues in some applications.
Unreacted species cause potential migration issues in some applications.
Leading the wayRegulation Around Migration
Originally regulation imposed by industries on food packaging applications. • EuPIA regulation (November 2016). • Nestle List (Version 4.0.1. 2016) • Swiss Ordinance (Annex 10, RS817.023.12)• EU No 10/2011
Regulation on migration in non-food applications. IKEA (IOS-MAT-0066)
Standard photoinitiators can be used as long as migration levels are below the threshold values and excluded products are not used. Polymeric photoinitiators provide an
alternative with lower migration risk.
Leading the wayMolecular Weight and Migration
0
10
20
30
40
50
60
70
80
90
250 500 750 1000
Mig
ration
Molecular Weight / g mol-1
Low
High
Low Molecular WeightPhotoinitiators SpeedCure 73, 84, BP, ITXhave MWs of 250 g mol-1 or less and are known to readily migrate.
High Molecular WeightPhotoinitiators with MW around 500 g mol-1
give low migration.Those with MW of 1000 g mol-1 give near-zero migration.
Green, W. Arthur. Industrial Photoinitiators: A Technical Guide. CRC Press, 2010.
Leading the wayPolymeric Photoinitiators
PI
PI
PI
PI
PI
PI
Features:High molecular weight Low volatilityLow odourHigh viscosity Affects rheology.Reactivity Depends on mole fraction PI.
High molecular weight structures have been designed to reduce migration
Leading the wayPolymeric Photoinitiator Products
7005
• Liquid polymeric benzophenone.• Molecular weight (Mn) ~ 1200 g mol-1. • Very low migration and low odour.• Used in combination with a polymeric amine
synergist. 0
0.5
1
1.5
2
2.5
3
3.5
210 260 310 360 410
Ab
sorb
ance
Wavelength (nm)
Leading the way
• Highly active multifunctional polymeric thioxanthone• Mercury and LED active• Molecular weight (Mn) ~ 1800 g mol-1. • Very low migration and low yellowing• Used with a polymeric amine synergist
0
0.5
1
1.5
2
2.5
3
210 260 310 360 410
Ab
sorb
ance
Wavelength (nm)
7010
Polymeric Photoinitiator Products
Leading the wayPolymeric photoinitiator Products
• Liquid polymeric amine.• Molecular weight (Mn) ~1050 g mol-1.• Highly efficient polymeric amine synergist.• Very low migration and low odour.
0
0.5
1
1.5
2
2.5
3
210 260 310 360 410
Ab
sorb
ance
Wavelength (nm)
7040
Leading the wayPolymeric Photoinitiator Products
• Liquid polymeric thioxanthone in EO-TMPTA.• Designed for low migration inks and coatings (mercury & LED active)• Used in combination with polymeric amine synergist
• Low migration ready to use formulated PI (mercury & LED active)• Designed for food packaging related applications of UV
Flexographic, Offset and Screen Printing inks where low migration as a main characteristic is mandatory.
LM
7010-L
01
Leading the way
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Thank you for your attention Questions?