US Patent 7851533 Stabilized halogen-containing resin composition

A stabilized halogen-containing resin composition containing a halogen-containing resin and a complex of acid white clay and/or activated white clay with a calcium hydroxide compound represented by the formula (1),Ca1-x-yM2+xAly(OH)2  (1)wherein M2+ represents at least one bivalent metal selected from the group consisting of Mg, Zn, Cu and etc., x is in the range of 0≦x<0.4 and y is in the range of 0≦y<0.1,which composition solves the problems of strong initial coloration and poor processing stability of a calcium hydroxide compound, a process for producing the above complex and a thermal stabilizer containing the above complex.