A particular branched chain polyalkylenepolyamine ("PAPA") having plural amine groups including a secondary amine group intermediate terminal free primary amine groups (that is, neither one is hindered), and having at least two C atoms between each group, may be selectively cyclized with a ketoform reaction to form a polysubstituted piperazinone ("PSP"), with specific directivity. Such PSPs are linked to a triazine nucleus to yield piperazinone-triazine ("PIP-T") compounds which are excellent stabilizers for polyolefins and other light-degradable polymers. Certain acyclic polyalkylenepolyamines may have a PIP-T substituent at each N atom forming pendant PIP-Ts ("P[PIP-T]" for brevity) which are also excellent stabilizers, and like some of the PIP-Ts, some P[PIP-T]s provide photostabilization without noticeably interfering with the color of films and fibers provided by even pastel-colored pigments and dyes.
一种特殊的支链聚亚烷基
庚胺("PAPA")具有多个胺基团,其中包括一个仲胺基团和一个末端游离
伯胺基团(即二者均不受阻),并且每个基团之间至少有两个 C 原子,可以通过酮化反应选择性地环化,形成具有特定指向性的多取代
哌嗪酮("P
SP")。这种 P
SP 与三嗪核相连,生成
哌嗪酮-三嗪("
PIP-T")化合物,是聚烯烃和其他光降解聚合物的优良稳定剂。某些无环聚亚烷基
多胺可能在每个 N 原子上都有一个
PIP-T 取代基,形成悬垂
PIP-T(简写为 "P[
PIP-T]"),这也是非常好的稳定剂,而且与某些
PIP-T 一样,某些 P[
PIP-T]s 在提供光稳定的同时,甚至不会明显干扰粉彩
颜料和
染料所提供的薄膜和纤维的颜色。