| 摘要 |
Spiromonomers with enhanced reactivity and ring-opening proficiency of the formulae: <IMAGE> (I) wherein R1 represents a C1-C6 alkenyl, R2 represents hydrogen or C1-C6 alkenyl, R3 represents a C1-C6 alkyl or C3-C8 cycloaliphatic unsubstituted, or substituted with halo, C1-C6 alkyl, alkoxy, hydroxy, or one of one or more hetero atoms; and R4 represents a C1-C6 alkyl or C3-C8 cycloaliphatic unsubstituted, or substituted with halo, C1-C6 alkyl, alkoxy, hydroxy, or one of one or more hetero atoms; formula (II) <IMAGE> (II) wherein R5 is a C1-C6 alkenyl; R6 represents hydrogen or C1-C6 alkenyl; R7 is a C1-C6 alkenyl or C3-C8 cycloaliphatic unsubstituted, or substituted with halo, C1-C6 alkyl, alkoxy, hydroxy, or one of one or more hetero atoms; or aryl; and R8 is hydrogen or C1-C6 alkyl or a C3-C8 cycloaliphatic unsubstituted, or substituted with halo, C1-C6 alkyl, alkoxy, hydroxy, or one of one or more hetero atoms; or aryl; and formula (III) <IMAGE> (III) wherein R9 is a C1-C6 alkenyl and R10 is hydrogen or C1-C6 alkyl; are used in compositions which, in the absence of the spiromonomers, normally undergo shrinkage, so that the resulting polymerizates exhibit substantially zero shrinkage or even slight positive expansion.
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