Vinyl chloride polymerization process
Vinyl chloride is polymerized by suspension or homogenized dispersion polymerization using a free radical-yielding initiator in which 0.02% by weight, based on the weight of vinyl chloride, of at least one .alpha.-olefin having from 6 to 20 carbon atoms is added to the vinyl chloride either (a) prior to the start of polymerization in the case of homogenized dispersion polymerization, or (b) prior to the start of or during the polymerization, but in any event before the onset of autoacceleration in the case of suspension polymerization. The disclosed process avoids or reduces the tendency of the vinyl chloride to undergo autoacceleration during the polymerization.Preferably the amount of .alpha.-olefin employed is 0.03% to 0.075% by weight, particularly 0.03% to 0.06% by weight. The .alpha.-olefin preferably contains 8 to 20 carbon atoms; suitable .alpha.-olefins include octene-1, nonene-1, decene-1, dodecene-1, tetradecene-1, hexadecene-1, octadecene-1, and eicosene-1.
Latest Imperial Chemical Industries Limited Patents:
Type: Grant
Filed: Jan 19, 1979
Date of Patent: Nov 6, 1979
Assignee: Imperial Chemical Industries Limited (London)
Inventor: William E. Andrew (Hertford)
Application Number: 6/5,024
International Classification: C08F 226; C08F 220; C08F 1406;