申请人:E. I. Du Pont de Nemours and Company
公开号:US04111960A1
公开(公告)日:1978-09-05
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 F.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.
提供了具有以下式子的取代二氧兰:##STR1##
其中,R1和R2为H或苯基,该苯基被低烷基或硝基的高达5个取代基所取代,但至少有一个F1和R2是具有一个邻硝基取代基的苯基;R3和R4均为H或低烷基。这些二氧兰以及适当的二氧杂环烷被用于插层聚甲醛聚合物,以使得该聚合物具有热稳定但光化学敏感和可降解的随机连接##STR2##在链中,其中n为0或1,R3和R4为H或低烷基,至少有一个R1和R2是具有邻硝基取代基的苯基。通过将聚合物的薄膜暴露在透明度下的光线下,然后加热或用碱进行加热处理,可以获得透明度上的复制品的浮雕图像。