| 摘要 |
A sequential block copolymer of the formula:R1X-[CyH2yO)m)CxH2xO)n-H](I)containing: (i) a moiety R1X derived from a starter molecule having at least one active hydrogen wherein R1X is either a C10-C24 alkyl or a C9-C24 alkaryl group, X is O, S or N, (ii) a polymeric block derived from at least one alkylene oxide of formula CxHx2O wherein x is either 3 or 4, and (iii) a polymeric block derived from at least one alkylene oxide of formula CyH2yO wherein y is an integer in the range from 12 to 16, and wherein q is 1 when X is O or S, and q is 2 when X is N; and m and n are such that the molecular weight is in the range from 600 to 4000; and the (CyH2yO) polymeric block derived from the alkylene oxide of formula CyH2yO forms from 1 to 40% by weight of the copolymer, and the polymeric block derived from the alkylene oxide of formula CyH2yO constitutes the first polymeric block of the sequential block copolymer and is linked directly to the moiety R1X.
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