Ortho-nitrophenylethylene glycols

Abstract

Substituted dioxolanes are provided having the formula ##STR1## wherein R.sup.1 and R.sup.2 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 R.sup.1 and R.sup.2 is a phenyl group having an orthonitro substituent; and R.sup.3 and R.sup.4 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 ##STR2## in the chain where n is 0 or 1, R.sup.3 and R.sup.4 are H or lower alkyl and at least one of R.sup.1 and R.sup.2 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.

Dependencies are inferred from the claim text.