Chlorinated polyethylene elastomers
AssigneeE. I. Du Pont de Nemours and Company
InventorRoyce E. Ennis
Life of this patent
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Abstract
An uncured chlorinated polyethylene elastomer having a molecular weight distribution of about 6-13, as determined by the ratio of Mw/Mn where Mw represents the weight average molecular weight and Mn represents the number average molecular weight, a chlorine content of about 20-28% by weight, a Mooney viscosity value, determined according to ASTM D 1646-81, ML.sub.(1+4) at 100.degree. C., of about 15-36; and, optionally, a sulfur content of about 0.2-2% by weight and a process for their preparation.
Claims6
In a process for making an uncured chlorosulfonated polyolefin elastomer which comprises mixing polyethylene with chlorine or a chlorine-generating material in the presence of sulfur dioxide or sulfuryl chloride at elevated temperatures, the improvement which comprises said polyethylene having a flow rate of about 1-8 grams per 10 minutes as determined by ASTM D 1238 Condition E, and a molecular weight distribution of about 6-13 as determined by the ratio of Mw/Mn where Mw represents the weight average molecular weight and Mn represents the number average molecular weight and adding to the polyethylene an amount of chlorine or chlorine-generating material sufficient to incorporate into the polyethylene about 20-28% by weight chlorine.
An uncured chlorosulfonated polyethylene elastomer having:
- (a) a molecular weight distribution of about 6-13, as determined by the ratio of Mw/Mn where Mw represents the weight average molecular weight and Mn represents the number average molecular weight;
- (b) a chlorine content of about 20-28% by weight;
- (c) a Mooney viscosity value, determined according to ASTM D 1646-81, ML.sub.(1+4) at 100.degree. C., of about 15-36;
- and
- (d) a sulfur content of about 0.2-2 percent by weight.
Dependencies are inferred from the claim text.