13286-24-3

A process for producing particles, the process including pulverizing particles of a compound represented by formula (I) with a median diameter (50% D) of over 100 μm by using a pulverizer in the presence of at least one member selected from the group consisting of silica, talc and clay, to obtain particles of the compound represented by formula (I) with a median diameter (50% D) of 100 μm or less, in formula (I), R1 and R2 each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, or alternatively, R1 and R2 are inked to each other to form a ring together with the nitrogen atom to which they are bound, m represents an integer of 2 to 9, Mn+ represents H+ or an n-valent metal ion, and n represents an integer of 1 or 2.

An aminoalkylthiosulfuric acid compound represented by formula (1): is produced. In step (A1), a hydrochloride of a chloroalkylamine compound represented by formula (2): is reacted with an alkali metal salt of thiosulfuric acid in the presence of 2 to 6 parts by weight of water with respect to 1 part by weight of the hydrochloride between 50° C. and 100° C. R1 and R2 each represents a hydrogen atom and the like, and n represents an integer of 2 to 9. In step (B1), a mixture of a solid containing the aminoalkylthiosulfuric acid compound and a liquid containing an alkali metal chloride is obtained by adjusting the temperature of the mixture of step (A1) to between ?15° C. and 50° C. In step (C1), the aminoalkylthiosulfuric acid compound is obtained as solid by separating the solid containing the aminoalkylthiosulfuric acid compound and the liquid containing the alkali metal chloride from the mixture of (B1).

Use of S-(3-aminopropyl)thiosulfuric acid and/or a metal salt thereof for improving the viscoelastic properties of a vulcanized rubber.

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