| 摘要 |
Substituted dioxolanes are provided having the formula <IMAGE> wherein R1 and R2 are H or a phenyl group substituted with up to 5 substituents of lower alkyl or nitro, with the proviso that at least one of F1 and R2 is a phenyl group having an orthonitro substituent; and R3 and R4 are each H or lower alkyl. These dioxolanes, as well as appropriate dioxanes, are used to intercalate a polyoxymethylene polymer to make such a polymer having thermally stable but photochemically sensitive and degradable random linkages <IMAGE> in the chain where n is 0 or 1, R3 and R4 are H or lower alkyl and at least one of R1 and R2 is a phenyl group with an orthonitro substituent. By exposing a film of the polymer to light through a transparency followed by heating or a heated treatment with base, a relief image of the copy on the transparency is obtained.
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