Burns, Doane, Swecker & Mathis
Sulfur-containing acid phosphoric ester internal release agent
 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, ##STR1## 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 R.sub.1 and R.sub.2 are independently alkyl groups. 
Mitsui Toatsu Chemicals, Inc.
B C
B29C C08K
inventional inventional
Masahiko Hiroyuki Teruyuki
Kusumoto Yamashita Nagata