A synthetic resin composition stabilized particularly against the deterioration caused by the action of heat and light, which comprises 100 parts by weight of a synthetic resin, 0.001 to 10 parts by weight of a cyclic phosphite compound represented by the following general formula (I) and 0.001 to 10 parts by weight of a hindered amine compound having a group represented by the following general formula (II) in its molecule:
wherein R₁ stands for a tert-butyl or tert-amyl group; R₂ stands for a C1∼9 alkyl group; R₃ stands for a hydrogen atom or a C1∼4 alkyl group and R₄ stands for a C1∼30 alkyl group.
一种合成
树脂组合物,特别能防止热和光作用引起的劣化,它包括按重量计 100 份合成
树脂、按重量计 0.001 至 10 份由以下通式(I)代表的环状
亚磷酸酯化合物和按重量计 0.001 至 10 份在其分子中具有以下通式(II)代表的基团的受阻胺化合物:
其中 R₁ 代表叔丁基或叔戊基;R₂ 代表 C1∼9 烷基;R₃ 代表氢原子或 C1∼4 烷基;R₄ 代表 C1∼30 烷基。