Process for synthesizing epoxidized polysulfides

Details Process for synthesizing epoxidized polysulfides Process for synthesizing epoxidized polysulfides

C - Chemistry, Metallurgy

08

G

402/319

C08G 75/14 (2006.01) C08G 59/02 (2006.01)

Patent

CA 1333120

An improved process for reacting a mercaptan- terminated aliphatic polysulfide resin with excess epichlorohydrin in the presence of alkali to form an epoxidized polysulfide is disclosed. The reaction takes place in the absence of a solvent such as ethyl alcohol or ether, which will form an inseparable azeotrope with epichlorohydrin and water. The reaction is carried out at a temperature and pressure sufficient to distill away epichlorohydrin and by-product water. The water and epichlorohydrin are separated and the epichlorohydrin is returned to the pot during the reaction. After the reaction is complete, the epichlo- rohydrin is stripped, leaving an epoxidized polysul- fide, by-product sodium chloride, and residual alkali. The epoxidized polysulfide is dissolved in a work-up solvent and filtered to remove sodium chloride and alkali. Then the work-up solvent is stripped, leaving a purified product.

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