Patent ID: 8529793

Claim:
A process for producing a granular stabilizer for a polymer, comprising a compound shown by the formula (1): wherein R 1 s and R 2 s each independently represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or a cycloalkyl group having 5 to 8 carbon atoms; R 3 s each independently represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and X represents a single bond, a sulfur atom, an oxygen atom, an alkylidene group having 1 to 8 carbon atoms or a cycloalkylidene group having 5 to 8 carbon atoms, wherein the process comprises: a first step of melting the compound shown by the formula (1), which has a melting point of T m ° C.; a second step of solidifying the molten material obtained in the first step at a temperature of T 1 ° C. wherein the T 1 ° C. is a temperature lower than T m ° C.; and a third step of heating the solidified material obtained in the second step under an atmosphere at a temperature of T 2 ° C. satisfying the formula (III): T m −30 <T 2 ≦T m (III)