Vinylidene Chloride
Title: Vinylidene Chloride
CAS Registry Number: 75-35-4
CAS Name: 1,1-Dichloroethene
Additional Names: 1,1-dichloroethylene; asym-dichloroethylene
Molecular Formula: C2H2Cl2
Molecular Weight: 96.94
Percent Composition: C 24.78%, H 2.08%, Cl 73.14%
Line Formula: CH2=CCl2
Literature References: Prepn from ethylene chloride: Reilly, US 2140548 (1938 to Dow); by dehydrochlorination of 1,1,2-trichloroethane: Conrad, Gould, US 2989570 (1961 to Ethyl Corp.). Review of production, properties and uses: D. S. Gibbs et al. in Kirk-Othmer Encyclopedia of Chemical Technology vol. 23 (Wiley-Interscience, New York, 3rd ed., 1982) pp 764-798; of toxicology and human exposure: Toxicological Profile for 1,1-Dichloroethene (PB 95-100152, 1994) 200 pp.
Properties: Liquid. Mild, sweet odor resembling that of chloroform. d420 1.2129. mp -122.5°. bp760 31.7°. nD20 1.4249. Practically insol in water. Sol in organic solvents. At temps >0° and especially in the presence of oxygen or other suitable catalysts polymerizes to a plastic. Several inhibitors to preserve the monomer have been invented. Uncontrolled polymerization may lead to explosive reaction products with oxygen or ozone: Reinhardt, Chem. Eng. News 25, 2136 (1947).
Melting point: mp -122.5°
Boiling point: bp760 31.7°
Index of refraction: nD20 1.4249
Density: d420 1.2129
CAUTION: Potential symptoms of overexposure are irritation of eyes, skin, throat; dizziness, headache, nausea; dyspnea; liver and kidney dysfunction; pneumonitis. Potential occupational carcinogen. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 332; Patty's Industrial Hygiene and Toxicology vol. 2E, G. D. Clayton, F. E. Clayton, Eds. (John Wiley & Sons, Inc., New York, 4th ed., 1994) pp 4181-4189.
Use: Intermediate in the production of "vinylidene polymer plastics" such as Saran (Dow) .

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