2,4-DIETHYLTHIOXANTHONE

PRODUCT IDENTIFICATION
CAS NO.

82799-44-8

2,4-DIETHYLTHIOXANTHONE

EINECS NO.  
FORMULA C17H16OS
MOL WT.

164.20

H.S. CODE  
SMILES

 

TOXICITY  
SYNONYMS 2,4-diethyl-9H-Thioxanthen-9-one; CS CURE 448;

CLASSIFICATION

 

PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE pale yellow powder
MELTING POINT 66 - 71 C
BOILING POINT  
SPECIFIC GRAVITY

 

SOLUBILITY IN WATER Insoluble (Soluble in most organic solvents)
AUTOIGNITION  
pH  
VAPOR DENSITY  
NFPA RATINGS Health: 1; Flammability: 0; Reactivity: 0
FLASH POINT

110 C

STABILITY Stable under ordinary conditions

APPLICATIONS
Polymerization is initiated generally by free radical. There are four types of free radical initiators which initiate polymerization.
  • Peroxides including hydroperoxides (tertiary-butyl hydroperoxide, benzoylperoxide)
  • Azocompound thermal initiators (azoisobutyronitrile)
  • Redoxinitiators (mixture of iron(III) acetylacetonate): free radicals are formed by one-electron transferreactions. Useful in low temperature and emulsion polymerization
  • Photoinitiators (benzoin, benzil dimethylketal)

The main advantage of polymerization started by photoinitiators is temperature-independence and easy control. It can be conducted at very low temperatures and can be stopped simply by removing the light source. Photoinitiators are compounds that break down into free radicals upon exposure to ultraviolet radiation. Photoinitiators undergo a unimolecular bond cleavage upon irradiation to yield free radicals (benzoin esters; benzil ketals; alpha-dialkoxy acetophenones; alpha-hydroxy-alkylphenones; alpha-amino alkyl- phosphine; acylphosphine oxides). Another type of photoinitiators undergo a bimolecular reaction where the excited state of the photoinitiator interacts with a second molecule (a coinitiator) to generate free radicals(benzo phenones,amines; thioxanthones,amines; titanocenes). Photoinitiators are widely applied in UV curing inks, wood coatings, paper coatings, optical fiber, PCB, screen printing , paper varnish and other surface coatings.
SALES SPECIFICATION

APPEARANCE

 pale yellow powder

ASSAY

97.0% min

MELTING POINT

66 - 71 C

VOLATILES

0.5% max

TRANSPORTATION
PACKING 50kgs in fiber drum
HAZARD CLASS  
UN NO.  
OTHER INFORMATION