C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/541, 204/91.
C08F 8/20 (2006.01) B01J 19/12 (2006.01) B01J 19/18 (2006.01) B01J 19/20 (2006.01) C08F 8/22 (2006.01) C08F 114/06 (2006.01) C08J 3/28 (2006.01)
Patent
CA 1216099
CHLORINATION OF POLY(VINYL CHLORIDE) IN LIQUID CHLORINE, AND CHLORINATED POLY(VINYL CHLORIDE) COMPOSITION ABSTRACT OF THE DISCLOSURE A process is disclosed for photochlorinating poly(vinyl chloride), ("PVC"), suspended in liquid chlorine ("Cl2") which swells the PVC and permits chlorination to occur in a gel phase. PVC starting material is in the form of solid free-flowing macrogranules which are slurried in from about 5 to about 50 times their weight of liquid C12 in a reaction zone maintained at a temperature in the range from about -50°C to about 50°C, and a pressure sufficient to maintain the chlorine in its liquid state. Since liquid Cl2 itself swells the PVC to provide a gel phase in which photochlorination occurs, no conventional chlorinated hydrocarbon swelling agents, catalytic materials and the like are necessary. The process may be operated as a batch process, or a continuous process. Typical chlorine content of PVC is about 56.7 percent by weight (% by wt), and the product of chlorination is chlorinated poly(vinyl chloride), ("CPVC"). When formed, this CPVC is dissolved in the liquid Cl2 to form a thick syrup-like solution. CPVC is recovered as a solid by evaporation of the liquid Cl2, or as a finely divided solid by adding a halogenated lower alkane slowly to the CPVC syrup. The solid CPVC is homogeneously chlorinated, and its morphology and spectra, especially its 13C nmr spectra, differentiate it from prior art compositions.
394069
Goodrich (b.,f.) Company (the)
Marcoux & Sher Swabey Mitchell Houle
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