Name: Photoinitiator TPO-L (Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide liquid)
Brand: Coatingsink
SKU: photoinitiator-tpo-l
Availability: InStock

Question 1

What is the advantage of TPO-L (liquid) over solid TPO powder in UV ink formulations?

Accepted Answer

TPO-L is the ethyl ester liquid analogue of solid TPO and offers identical photoinitiating performance without requiring heating or a solvent to incorporate it. Its liquid state enables easy blending at room temperature into UV inks, varnishes, and inkjet systems, reducing manufacturing complexity and improving dispersion homogeneity.

Question 2

Is TPO-L suitable for LED-UV curing systems?

Accepted Answer

TPO-L absorbs strongly around 370 nm, which overlaps well with 365–385 nm LED-UV lamp output. It is one of the most effective photoinitiators for LED-UV curing and is widely used in LED inkjet inks and LED-UV flexo varnishes. Always verify with your specific LED lamp spectrum and formulate with a complementary co-initiator for pigmented systems.

Purity	≥98%
Appearance	yellow liquid
UV Absorption Max	~370 nm
Viscosity (25°C)	100–400 mPa·s
Recommended Dosage	1–4% on UV-curable system

Photoinitiator TPO-L (Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide liquid)

Specifications

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