4,4′-Bis(diethylamino) Benzophenone, registered under CAS 90-93-7, is a highly efficient EMK photoinitiator widely used in UV-curable systems. Known for its strong absorption in the near-UV region and excellent photochemical reactivity, photoinitiator EMK enables ultra-fast curing, stable polymerization, and high-quality surface properties across multiple industries.

4,4′-Bis(diethylamino) Benzophenone Cas 90-93-7, this compound remains a core material in inks, coatings, adhesives, electronics, and polymer modification.

1. UV-Curable Coatings (Wood, Plastic, Metal & Automotive)

4,4′-Bis(diethylamino) Benzophenone (CAS 90-93-7) plays a critical role in modern UV-curable coatings. With the global shift toward environmentally friendly, solvent-free technologies, UV-curable coatings have become a preferred option. In these formulations, EMK photoinitiator provides rapid surface and through-cure even under low UV intensity.

Why it performs well in coatings:

Strong absorption between 330–400 nm enables high-speed curing.

Promotes deep curing for thick coatings without tackiness.

Excellent color stability ensures non-yellowing finishes.

Improves hardness, chemical resistance, and scratch resistance.

Key industry applications:

Wood coatings: fast-curing clear coats for furniture, flooring, veneer finishes.

Plastic coatings: electronic casings, automotive interiors, consumer electronics.

Metal coatings: protective topcoats for appliances, tools, and industrial machinery.

Automotive coatings: fast-drying clear coats and UV-refinishing systems.

2. UV-Curable Inks & High-Speed Printing Systems

In printing industries, 4,4′-Bis(diethylamino) Benzophenone offers excellent performance as a photoinitiator EMK, enabling instant drying and high-quality printing results.

Key advantages in printing inks:

Ultra-fast curing enables immediate stacking and processing.

Produces high-gloss, high-clarity surfaces.

Ensures excellent pigment wetting and color stability.

Reduces migration—important for packaging inks.

Requires lower UV energy, cutting operational costs.

Printing technologies that use CAS 90-93-7:

• Flexographic inks for packaging & labels
• Offset UV inks for commercial printing
• Screen printing inks for textiles, electronics, and signage
• Digital UV inkjet inks for labels, décor, and industrial printing

The compound’s strong UV response makes it ideal for high-speed printing presses where every millisecond of drying time matters.

3. UV-Curable Adhesives & Pressure-Sensitive Systems

As industries move toward cleaner, faster assembly methods, UV-curable adhesives continue gaining popularity. CAS 90-93-7 is widely chosen for its:

Performance benefits in adhesives:

Very rapid bonding under UV exposure.

Excellent adhesion to metal, plastic, glass, and composite substrates.

Low shrinkage, preventing deformation in sensitive components.

Suitable for transparent systems with minimal yellowing.

Major application examples:

• Electronics assembly: bonding smartphone parts, sensors, chips, optical components.
• Medical devices: catheters, syringes, flexible tubing (low migration required).
• Packaging: high-speed label production and lamination.
• Optical adhesives: LCD panels, lenses, LED assemblies.

Thanks to its stability and curing efficiency, photoinitiator EMK enables precise, clean adhesive bonding in industries that require high reliability and minimal process downtime.

4. Electronics Manufacturing & Advanced Photoresists

The electronics sector requires materials that respond precisely to UV exposure. 90-93-7 is widely used in photoresists and micro-patterning materials due to its:

Key photochemical advantages:

Generates radicals efficiently for controlled polymerization.

Offers strong absorption for fine-line patterning.

Allows high-resolution imaging for tiny circuit features.

Maintains stability under thermal and UV stress.

Where CAS 90-93-7 is used:

• PCB (Printed Circuit Board) photoresists
• Semiconductor lithography materials
• UV-patterning resins for microelectronics
• Protective coatings for electronic components

In highly precise manufacturing environments, the use of 4,4′-Bis(diethylamino) Benzophenone ensures consistent polymerization, which is essential for product reliability and long-term performance.

5. Polymers, Acrylic Resins & 3D Printing Photopolymers

Polymer modification is an expanding application area for CAS 90-93-7 as industries increasingly adopt UV-assisted polymer curing and surface functionalization technologies.

Benefits in polymer processing:

Enhances crosslinking and improves mechanical strength.

Boosts scratch resistance and chemical stability of plastics.

Helps create UV-stable, durable polymer surfaces.

Supports low-temperature polymer curing—ideal for heat-sensitive materials.

Typical applications:

• Acrylic resin systems for coatings and adhesives
• Surface-hardened polymer films
• 3D printing photopolymer resins (SLA, DLP technologies)
• Modified plastics for electronics and packaging

Industries rely on EMK photoinitiator to achieve efficient polymer curing without compromising clarity or color stability.

6. Varnishes, Clear Coats & Industrial Finishes

For varnishes and specialty finishes, 4,4′-Bis(diethylamino) Benzophenone enhances appearance and durability.

Key performance improvements:

Produces high-smoothness, high-gloss finishes.

Contributes to excellent abrasion and chemical resistance.

Ensures non-yellowing transparent coatings.

Shortens coating process time, reducing production cost.

Industries using CAS 90-93-7 for varnishes:

• Packaging (UV varnishes for labels & printing)
• Commercial printing
• Industrial protective coatings
• Decorative finishes for plastics, metals, and wood

Because of its efficient curing behavior, 90-93-7 is indispensable for manufacturers aiming for high-throughput, low-emission, and high-performance finishing systems.

7. Conclusion

4,4′-Bis(diethylamino) Benzophenone, widely known under CAS 90-93-7, remains one of the most reliable and efficient EMK photoinitiators in modern UV-curing technologies. Its strong UV absorption, rapid initiation ability, excellent color stability, and wide compatibility with coatings, inks, adhesives, electronics, and polymer systems make it indispensable across many industries.

As a professional supplier of CAS 90-93-7, we provide high-purity, stable-quality photoinitiator EMK suitable for coatings, inks, UV adhesives, electronics, and specialty polymer applications. We support bulk supply, technical guidance, and sample testing, helping customers achieve consistent curing performance and reliable product quality.

If you need specifications, COA/MSDS, quotation, or formulation support, feel free to contact us anytime.