| 摘要 |
An N-(monosubstituted)dithiooxamide compound of the formula: H2N-@-@-NHR<3> wherein R<3> comprises: (a) an alkyl or aralkyl group having 11 or more carbon atoms; or (b) a group of the structure -R<4>-Y-R<5> wherein: (i) when Y is a functional group selected from the group consisting of -N(R<6>)C(O)-, -C(O)N(R<6>)-, -N(R<6>)-, -N(R<6>)C(O)O-, -OC(O)N(R<6>)-, and -N(R<6>)C(O)N(R<7>), wherein R<6> and R<7> are independently hydrogen, or an alkyl or aralkyl group having 1 to 12 carbon atoms: R<4> is a divalent alkyl or divalent aralkyl group having 1 to 12 carbon atoms; R<5> is hydrogen, or an alkyl or aralkyl group having 1 to 20 carbon atoms; and, the total number of carbon atoms in R<4> plus R<5> is at least 7; or (ii) when Y is a functional group selected from the group consisting of -OC(O)-, -C(O)O-, and -OC(O)O-: R<4> is a divalent alkyl or divalent aralkyl group having 1 to 12 carbon atoms; R<5> is hydrogen, or an alkyl or aralkyl group having 1 to 20 carbon atoms; and, the total number of carbon atoms in R<4> plus R<5> is at least 9. Preferred materials are those for which when the monosubstituent dithiooxamide is complexed with a transition metal cation, the resulting polymer is substantially a dark, i.e., blue or blue-black color. Carbonless paper constructions involving use of N-(monosubstituted)dithiooxamides to advantage are described. |
