Methanol → Styrene

Participants

Reaction Steps

A series of resinous copolymers of 1,3-butadiene, styrene and isobutylene was prepared according to the following method and identified herein as Experiments A-G. To a reactor was charged heptane solvent, except for hexane in Experiments C and D, water and ethylaluminum dichloride. An overall concentration of the aluminum catalyst was about 0.5 percent. The mixture was stirred in order to adequately mix the reactants. The 1,3-butadiene (used in Experiments F and G), styrene and isobutylene monomers were rather slowly added simultaneously over a period of time in order to maintain essentially no unreacted styrene and isobutylene monomers and the mixture allowed to further react for an additional length of time after all of the monomers had been added. The catalyst was then deactivated with methanol and lime. The resulting resin solution was filtered and the filtrate distilled to remove solvent and unreacted monomer. The resulting recovered resin was then analyzed to determine its softening point according to ASTM E28-58T.

Provenance & Evidence