4-Chlorobenzophenone CAS 134-85-0

Description:

4-Chlorobenzophenone (also known as p-Chlorobenzophenone), identified by CAS number 134-85-0, is an organic compound commonly supplied as an off-white to pale yellow crystalline solid. It functions primarily as a highly efficient Type II photoinitiator, crucial for initiating polymerization reactions upon exposure to ultraviolet (UV) light. Beyond its key role in UV-curable inks, coatings, and adhesives, 4-Chlorobenzophenone also serves as a versatile chemical intermediate in the synthesis of various organic compounds, including potentially active pharmaceutical ingredients (APIs) and other fine chemicals.

Properties:

Property	Value
Chemical Formula	C13​H9​ClO
Molecular Weight	Approximately $216.66g/mol$
CAS Number	134-85-0
Appearance	Off-white to pale yellow crystalline solid (powder/flakes)
Melting Point	Approximately $74-78°C$
Boiling Point	Approximately $190°C$ at $15mmHg$ (or ~$330°C$ decomp.)
Solubility	Insoluble in water; Soluble in many organic solvents (e.g., acetone, toluene, ethanol)

Usage:

The primary applications of 4-Chlorobenzophenone stem from its photochemical properties and its utility as a building block:

• UV Curing Photoinitiator: Widely used in formulations for UV-curable inks, varnishes, adhesives, and coatings. It absorbs UV radiation and, typically in conjunction with a co-initiator (like an amine synergist), generates free radicals to initiate rapid polymerization (curing).
• Chemical Synthesis Intermediate: Acts as a key starting material or intermediate in the production of pharmaceuticals, agrochemicals, dyes, and other specialized organic chemicals.

Packaging and Transportation:

4-Chlorobenzophenone is typically packaged in industry-standard containers suitable for solid chemicals, such as fiber drums or multi-layer bags, designed to protect the product quality. Transportation is carried out in compliance with relevant national and international regulations, which may include specific labeling if classified under certain hazard categories (e.g., environmentally hazardous).

Storage:

Store 4-Chlorobenzophenone in a cool, dry, well-ventilated area, keeping containers tightly closed to prevent moisture ingress. Protect from direct sunlight and light exposure. Keep away from incompatible materials, particularly strong oxidizing agents. Follow recommended storage guidelines as detailed in the product’s Safety Data Sheet (SDS).