C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/327
C08F 8/38 (2006.01)
Patent
CA 1255434
64693-3677 ABSTRACT Chlorosulfonated polyethylene materials having (a) molecular weight of from about 40,000 to 300,000, (b) chemically combined chlorine content of from 20 to 50 percent by weight of polymer, (c) a chemically combined sulfur content of from 0.8 to 2.5 percent by weight of polymer and (d) a 100 percent modulus of from 0.6 to 4.8 MPa are prepared in an anhydrous process wherein an amorphous chlorinated polyethylene starting material is first fluidized and then exposed to a gaseous mixture of sulfur dioxide and chlorine having a ratio of sulfur dioxide to chlorine of from 1:1 to 16:1 in the presence of a chlorine free radical generator such as ultraviolet light at a temperature of from 25° to 100°C for a period of two hours or less. In contrast to chlorosulfonated polyethylene materials made in accordance with prior art processes, chlorosulfonated polyethylene materials in accordance with this invention are readily processable on equipment generally used in the rubber industry such as two-roll compounding mills, high intensity miscers and the like.
491375
Smart & Biggar
The Dow Chemical Company
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