Process for isolation of low molecular weight chlorinated and chlorosulfonated resins
AssigneeE. I. Du Pont de Nemours and Company
InventorEdward G. Brugel
Life of this patent
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Abstract
Low molecular weight olefin resins are blended with small amounts of high molecular weight olefin resins and the blends are chlorinated or chlorosulfonated. Melt and film strengths of the resultant low molecular weight chlorinated and chlorosulfonated resins are thereby increased sufficiently to enable recovery by means of methods which require film or strand formation. The chemical properties and solution characteristics of the blends are substantially maintained compared to those of the low molecular weight chlorinated resins themselves.
Claims18
A process for isolation of low molecular weight chlorinated olefin polymers having enhanced melt and film strength which comprises
- (a) preparing an olefin polymer blend by combining a C.sub.2 -C.sub.8 olefin polymer having a melt index of 0.5-20 g/10 minutes, as determined according to ASTM D 1238, Method E, with a C.sub.2 -C.sub.8 olefin polymer having a weight average molecular weight below about 10,000 in a weight ratio of about 2-15:100 respectively,
- (b) chlorinating the olefin polymer blend in a halogenated solvent in the presence of a free radical catalyst and a chlorinating agent to produce a chlorinated olefin polymer blend having a chlorine content of 20-70% by weight, and
- (c) recovering the chlorinated polymer blend.
Dependencies are inferred from the claim text.