BENZILDIMETHYL KETAL

PRODUCT IDENTIFICATION
CAS NO. 24650-42-8

BENZILDIMETHYL KETAL

EINECS NO. 246-386-6
FORMULA C16H16O3
MOL WT.

256.30

H.S. CODE  
TOXICITY  
SYNONYMS 2,2-Diethoxy-2-Phenylacetophenone; Ciba Iragure 651;
DMPA; 2,2-Dimethoxy-2-phenylacetophenone; a,a-Dimethoxydeoxybenzoin
SMILES

 

CLASSIFICATION

 
 

PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE white crystalline powder
MELTING POINT 63 - 66 C
BOILING POINT 300 C
SPECIFIC GRAVITY

1.2

SOLUBILITY IN WATER Insoluble
AUTOIGNITION  
pH  
VAPOR DENSITY  
NFPA RATINGS Health: 1; Flammability: 0; Reactivity: 0
FLASH POINT

 

STABILITY Stable under ordinary conditions

GENERAL DESCRIPTION & 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

 White crystalline powder

ASSAY

99.5% min

MELTING POINT 63 C min

MOISTURE

0.1% max

VOLATILES

0.2% max

HEAVY METALS

50ppm max

CLARITY OF SOLUITON

Clear ( 10g in 100ml toluene)

BENZIL

0.1% max

TRANSMITTANCE

95% min (425nm) , 98% min (500nm)

RESIDUE ON IGNITION

0.1% max

TRANSPORTATION
PACKING 50kgs in Fiber drum
HAZARD CLASS  
UN NO.  

PRICE INFORMATION