Process for preparing polysulfide chain terminator

Details Process for preparing polysulfide chain terminator Process for preparing polysulfide chain terminator

C - Chemistry, Metallurgy

08

F

252/41, 260/643.

C08F 2/38 (2006.01)

Patent

CA 1144574

ABSTRACT OF THE DISCLOSURE A process is disclosed for preparing a mixture of hydroxyl-containing di- and trisulfides, from either 2-mercaptoethanol or 3-mercaptopropanol, directly in two steps, without the formation of deleterious byproducts. Precise control if process conditions (a) in a first step in which the disulfideis formed, includes oxidation of mercapto-lower alkanol with a stoichiometric amount of H2O2 while maintaining the pH and temperature of a relatively dilute aqueous reaction mixture within a specific narrow range; and, (b) in a second step in which a predetermined portion of the disulfide is converted substantially exclusively to the trisulfide, requires controlled heating of the reaction mixture to a temperature not to exceed 100°C. The process may be carried out in a single reaction vessel, and directly yields a preselected distribution of disulfide and trisulfide in the mixture. The mixture is especially useful as a chain terminator in the preparation of hydroxyl- terminated liquid polymers having an aliphatic polymeric backbone and sulfide linkages near the terminal portions of the polymer molecule (referrred to as "HTPS" polymers).

365430

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