专利名称：Photographic developers发明人：Richard B. Greenwald申请号：US05/794480申请日：19770506公开号：US04128425A公开日：19781205
摘要：In one embodiment, the present invention relates to pyrazolidine derivatives,some of which are novel compounds, all of which are represented by the formula:##STR1## wherein R.sup.1 and R.sup.2 taken individually, the same or different, are eachhydrocarbon moieties containing up to about 20 carbon atoms selected from alkyl, aryl,aralkyl and alkaryl, which moieties may be unsubstituted or substituted with a
substituent selected from carboalkoxyalkyl, aryl, alkyl, alkoxy, hydroalkyl, aminoalkyl,ketalalkyl and acetalalkyl, and R.sup.1 and R.sup. 2 taken together represent the carbonatoms necessary to complete a cyclic moiety selected from: ##STR2## which cyclicmoieties may be unsubstituted or substituted with the above-identified substituents; Y is--OH or --NH.sub.2 ; and X is --OH, --NH.sub.2, --NH.sub.2.Z where Z is a salt, or --NHRwhere R is alkyl or aryl.
In another embodiment, the present invention is directed to the use of the above-denoted class of compounds as photographic silver halide developing agents and tophotographic processes, products and compositions employing the same.
申请人：POLAROID CORPORATION
代理人：Gaetano D. Maccarone,Doris M. Bennett
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