An internal release agent comprises a sulfur-containing acid phosphoric esters selected from the group consisting of thiophosphoric acid esters and dithiophosphoric acid esters of the formula,
where X and Y are independently selected from the group consisting of an oxygen atom and a sulfur atom, at least one of X and Y is a sulfur atom, and R₁ and R₂ are independently alkyl groups.
内脱模剂包括从
硫代磷酸酯和
二硫代磷酸酯组成的组中选出的含
硫酸性
磷酸酯,其式为
其中,X 和 Y 独立地选自由氧原子和
硫原子组成的组,X 和 Y 中至少有一个是
硫原子,R₁ 和 R₂ 独立地为烷基。