A phosphite and stabilized themoplastic composition comprising the phosphite where the phosphite has the formula:
 In the above compound, R7 and R8 are preferably alkyl of from 1 to 6 carbon atoms, most preferably an unsubstituted alkyl group. R9 is preferably alkyl of 1 to 12 carbon atoms. m is from 0 to 5. The dicumyl group includes the OX groups which are the phosphite portion. The OX group is hindered by only one alkylaryl group at the ortho position with the other ortho position being occupied by hydrogen. X has the following formula:
 wherein R2 is independently selected from the group consisting of alkyl groups having from 1 to 12 carbon atoms. z1 and z2 can be 0 or 1. R3, R4 and R5 are independently selected from the group consisting of hydrogen, halogen, or alkyl of from 1 to 3 carbon atoms.
                            一种
亚磷酸酯和包含该
亚磷酸酯的稳定主题塑料组合物,其中
亚磷酸酯具有如下式:
 在上述化合物中,R7 和 R8 最好是 1 至 6 个碳原子的烷基,最好是未取代的烷基。R9 最好是 1 至 12 个碳原子的烷基。
二异丙基包括作为
亚磷酸部分的 OX 基团。OX 基团在正交位置上只受一个烷基芳基的阻碍,另一个正交位置被氢占据。X 具有下式
 其中 R2 独立地选自具有 1 至 12 个碳原子的烷基所组成的组。R3、R4 和 R5 独立地选自氢、卤素或 1 至 3 个碳原子的烷基组成的组。