To obtain a vinyl chloride polymer which has excellent balanced elongation properties in forming such as vacuum forming by specifying the degree of polymerization and mol.wt. distribution of a vinyl chloride polymer.
This vinyl chloride polymer has an average mol.wt. of 600 to 1,400 and meets a relationship represented by the fromula: 2.15≤Mw/Mn≤5; and 1.75≤Mz/Mw≤5 wherein Mn represents the no. average mol.wt., Mw represents the wt. average mol.wt., and Mz represents the average mol.wt. It is prepd. by adding a compd. having in its molecule at least two ethylenically unsatd. double bond in an amt. of 0.01 to 1wt.%, based on a vinyl chloride monomer, in the suspension polymn. of a vinyl chloride monomer or a copolymerizable monomer mixture composed mainly of a vinyl chloride monomer in an aq. medium in the presence of an oil-soluble initiator. This vinyl chloride polymer has good melt properties at a temp. comonly used in vacuum forming (150 to 230°C) and good conformability of the corner portion of a molding to a mold, rendering the thickness of the resultant molding even.
SHINAGAWA HIDEYA
YAMAMOTO RYOSUKE
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