Novel diorganopolysiloxanes containing benzalmalonate functional groups, well adapted as coatings for optical fibers, as well as lubricants for plastic substrates, e.g., PVC substrates, have one of the following formulae: ##STR1## in which A and/or B is a benzalmalonate radical.
                            含有苯基马隆酸酯官能团的新型双有机聚
硅氧烷,适用于光纤涂层和塑料基底润滑剂,例如P
VC基底,具有以下公式之一:##STR1## 其中A和/或B是苯基马隆酸酯基团。