| 摘要 |
By adding substances corresponding to the following general formula I <IMAGE> (I) in which X=O, S or N-R5; R1=hydrogen, C1-C19-alkyl, C2-C19-alkenyl, phenyl, C1-C4-alkylene phenyl, C5-C12-cycloalkyl or C5-C12-cycloalkenyl; R2=hydrogen, C1-C19-alkyl, C2-C12-alkenyl, phenyl or C1-C4-alkylene phenyl; R3=hydrogen, C1-C19-alkyl, C2-C19-alkenyl, phenyl, C1-C4-alkylene phenyl, acryl formyl or acetyl; R4 and R5=same or different, C1-C19-alkyl, C2-C19-alkenyl, phenyl, C1-C4-alkylene phenyl, acryl, C5-C12-cycloalkyl or C5-C12-cycloalkenyl; R4 and R5 may also form a C4-C7-ring which may optionally contain an oxygen atom in ether form and the radicals R1 and R2 may form a C5-C12-alkylene bridge or a C5-C12 -alkenylene bridge, the radicals R1 and R4 may form a C2-C9-alkylene bridge and the radicals R1 and R3 may form a C3-C10-alkylene bridge; where R1 and R2 are attached, the ring formed may be bridged by a C1-C4-alkylene bridge and the ring systems formed may be substituted by the radical R6 which represents hydrogen, C1-C5-alkyl or C2-C5-alkenyl, in quantities of from 0.05 to 3% by weight, based on 100 parts by weight of monomer, to the aqueous emulsion polymerization of chloroprene at the beginning of the reaction, during or after polymerization, but at the latest before the residual monomers are removed, high-viscosity polychloroprenes characterized by excellent processing behaviour and product properties are obtained.
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