PURPOSE: The titled dispersant which can consistently given small polymer granules free of fine polymer particles, prepared by reacting a polymer of an N-vinyl cyclic amide with an α-olefin or an alkyl vinyl ether in the presence of a peroxide compound.
CONSTITUTION: A polymer of an N-vinyl cyclic amide of formula II (wherein R' and R" are each H, CH3 or C2H5 and n is 1W3), e.g., N-vinylpyrrolidone, is reacted with a 6C or higher α-olefin or an alkyl vinyl ether, wherein the alkyl group is 6C or higher, at 80W200°C for 10W40hr in the presence of a peroxide compound to obtain the titled dispersant comprising a polymer having repeating units of formula II, wherein (R1, R2) is selected from among the combinations of (H, H), (H, CH3), (H, C2H5), (CH3, C2H5), (H, 6C or higher linear or branched alkyl) and (H, 6C or higher alkoxyethyl) and R3W4 are each a 6C or higher linear or branched alkyl or a 6C or higher alkoxyethyl. A monomer is subjected to reversed phase suspension polymerization in the presence of 0.01W10wt% said dispersant.
HOSOKAWA YASUTOKU
YASUDA YUTAKA
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