2-CHLOROTHIOXANTHEN-9-ONE

PRODUCT IDENTIFICATION

CAS NO. 86-39-5

2-CHLOROTHIOXANTHEN-9-ONE

EINECS NO.  
FORMULA C13H7ClOS
MOL WT. 246.72
H.S. CODE  
TOXICITY  
SYNONYMS 2-Chlorothioxanthone;
PRICE

 

CLASSIFICATION

 

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE

yellow powder

MELTING POINT 150 - 154 C
BOILING POINT  
SPECIFIC GRAVITY  
SOLUBILITY IN WATER  
AUTOIGNITION  
pH  
VAPOR DENSITY  

REFRACTIVE INDEX

 
NFPA RATINGS  
FLASH POINT

 

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

yellow powder

ASSAY

98.0% min

MELTING POINT 150 - 154 C
TRANSPORTATION
PACKING  
HAZARD CLASS  
UN NO.  
OTHER INFORMATION