| 摘要 |
In a process for preparing a vinyl chloride resin by polymerizing vinyl chloride alone or with up to 20% by weight of other polymerizable unsaturated monomers, in an aqueous suspension, in the presence of a monomer-soluble free radical catalyst and a suspension stabilizer which is partially hydrolyzed polyvinyl acetate or cellulose ether, there is an improvement wherein the polymerization is conducted in the presence of 0.02-0.3% by weight, based on the amount of monomer to be polymerized, of a cosuspension stabilizer which is a copolymer of 2-n-propyl- DELTA 2-oxazoline, 2-isopropyl- DELTA 2-oxazoline or both and 2-methyl- DELTA 2oxazoline, 2-ethyl- DELTA 2-oxazoline or both, the copolymer having a viscosity number of 35-70 (ml/g), measured at 25 DEG C. in an isopropanol/water mixture (50 vol-% of isopropanol), in a concentration of 0.5% (weight/volume of the solution).
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