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US 4,361,683 AGranted
Termination of vinyl halide polymerization
AssigneeConoco Inc.
InventorsJohn R. Dodd, Dean R. Weimer
Life of this patent
Estimating the term…
Abstract
An improvement in the method of terminating the preparation of vinyl halide-containing polymers is disclosed. The improvement comprises injecting into the polymerization reactor at the desired level of conversion a free radical inhibitor obtained by the alkylation of p-methoxyphenol with nonene. The free radical inhibitor also functions as an antioxidant in the polymer product.
Claims14
An improvement in the method of terminating the polymerization of vinyl halide-containing polymers, wherein the improvement comprises:
- injecting a free radical inhibitor, obtained by the alkylation of P-methoxyphenol with nonene, into the polymerization reactor when the level of conversion of monomer to polymer is in the range of 75 to 90%, said inhibitor being injected in an effective amount in the range of about 0.01 to about 0.10 parts per hundred parts of monomer.
Dependencies are inferred from the claim text.