2,2-Dimethoxy-2-phenylacetophenone
[CAS# 24650-42-8]

Identification

• Classification: Chemical reagent >> Organic reagent >> Aromatic ketone
• Name: 2,2-Dimethoxy-2-phenylacetophenone
• Synonyms: Benzil alpha,alpha-dimethyl acetal
• Molecular Formula: C₁₆H₁₆O₃
• Molecular Weight: 256.30
• CAS Registry Number: 24650-42-8
• EC Number: 246-386-6
• SMILES: COC(C1=CC=CC=C1)(C(=O)C2=CC=CC=C2)OC

Properties

• Melting point: 64-68 °C

Safety Data

• Hazard Symbols: GHS07;GHS08;GHS09 Warning
• Risk Statements: H302-H373-H400-H410-H412
• Safety Statements: P260-P264-P270-P273-P301+P317-P319-P330-P391-P501

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Specific target organ toxicity - repeated exposure	STOT RE	2	H373
Acute toxicity	Acute Tox.	4	H302
Chronic hazardous to the aquatic environment	Aquatic Chronic	3	H412
Chronic hazardous to the aquatic environment	Aquatic Chronic	1	H410
Acute hazardous to the aquatic environment	Aquatic Acute	1	H400
Skin sensitization	Skin Sens.	1	H317
Skin corrosion	Skin Corr.	1B	H314
Chronic hazardous to the aquatic environment	Aquatic Chronic	2	H411
Respiratory sensitization	Resp. Sens.	1	H334
Flammable liquids	Flam. Liq.	3	H226

• Transport Information: UN 3077

Discovery and Applications

2,2-Dimethoxy-2-phenylacetophenone, often abbreviated as DMPA, is a chemical compound widely used as a photoinitiator in the polymer and coatings industries. Its primary function is to initiate polymerization processes upon exposure to ultraviolet (UV) light, making it a crucial component in the production of UV-cured coatings and inks.

The discovery of DMPA dates back to advancements in photoinitiator technology during the late 20th century. Researchers were exploring ways to improve the efficiency and effectiveness of UV-cured systems, leading to the development of various photoinitiators with enhanced properties. DMPA emerged as a significant advancement due to its strong UV absorption characteristics and ability to generate radicals necessary for polymerization.

The chemical structure of DMPA features two methoxy groups attached to the phenyl ring, which significantly influences its photochemical properties. When exposed to UV light, DMPA undergoes a photochemical reaction that produces free radicals. These radicals initiate the polymerization of monomers present in the coating or ink formulation, leading to the formation of a solid polymer network. This process is highly efficient, enabling rapid curing and hardening of the applied material.

One of the primary applications of DMPA is in UV-cured coatings. These coatings are used in a wide range of industries, including automotive, electronics, and graphic arts. The rapid curing process facilitated by DMPA allows for faster production times and improved durability of the final product. UV-cured coatings offer excellent adhesion, chemical resistance, and scratch resistance, making them suitable for high-performance applications where traditional curing methods might be less effective.

In addition to coatings, DMPA is also utilized in the formulation of UV-cured inks. The use of DMPA in ink formulations allows for quick drying and high-quality print finishes. This is particularly beneficial in the printing industry, where high-speed printing processes and superior print quality are essential. UV-cured inks featuring DMPA offer excellent color vibrancy and resistance to smudging, ensuring that printed materials maintain their appearance and durability.

DMPA's role extends beyond coatings and inks, as it is also used in the development of UV-cured adhesives and sealants. These adhesives and sealants benefit from the fast curing and strong bonding properties provided by DMPA. Applications range from automotive assembly to electronics encapsulation, where reliable and efficient curing is critical.

The versatility of DMPA makes it a valuable component in various applications. Its ability to facilitate rapid curing and enhance the performance of UV-cured materials has solidified its place in the industry. Ongoing research and development continue to explore new applications and formulations that leverage the unique properties of DMPA to meet evolving technological and performance requirements.

In summary, 2,2-Dimethoxy-2-phenylacetophenone is a key photoinitiator used in UV-cured coatings, inks, adhesives, and sealants. Its discovery and application have significantly impacted industries requiring efficient curing processes and high-performance materials.

References

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DOI: 10.1007/s10570-024-05843-7