| 摘要 |
The invention comprises heterocyclic derivatives of bis(p-dialkylaminoaryl)-methane, free from chromophoric groups and from acidic groups containing a hydrogen cation, in which both aryl groups are mononuclear and in which a ring nitrogen atom of a saturated heterocyclic nucleus containing at least 5 atoms in the ring is directly linked to the methane carbon atom and to two adjacent saturated carbon atoms in the heterocyclic ring and in which the alkyl groups of the dialkylamino radicals each have 1 to 5 carbon atoms. Particular derivatives specified are the N-bis[p-di-methyl (or ethyl) aminophenyl] methyl derivatives of pyrrolidine, piperidine, morpholine and piperazine. The derivatives are made by condensing the appropriate bis(p-dialkylaminoaryl)-methane having a replaceable reactive atom or group, such as halogen, hydroxyl, mercapto, alkoxy or imino, attached to the methane carbon atom with an appropriate heterocyclic compound having a hydrogen atom attached to a nitrogen atom in the ring. The derivatives turn a blue to violet colour on being brought into contact with an acidic electron acceptor and are used in so-called "colourless carbon papers" and other pressure-sensitive record materials (see Group VIII). Specification 873,186 is referred to.
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