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AssigneeUnibra Societe Anonyme
InventorsPhilippe T. Teyssie, Robert J. Jerome, Guy J. Broze
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Viscous, homogeneous and thermoreversible gels containing polymer chains are obtained by a process in which a solution of a prepolymer or polymer which contains at least one free acid group at each chain end in a non polar solvent selected among the aliphatic, alicyclic and aromatic hydrocarbons having a dielectric constant of less than about 3 is reacted at room temperature with a stoechiometric amount, based on the acid group content of the polymer, of a metal aliphatic alkoxide so as to neutralize all the free acid groups and a sufficient amount of the non polar solvent is distilled for removing, in a substantially quantitative manner, the aliphatic alcohol formed by said reaction.
A process for preparing viscous, homogeneous and thermoreversible gels containing polymer chains, in which a solution of a prepolymer or polymer which contains a free acid group only at each chain end in a non polar solvent selected among the aliphatic, alicyclic and aromatic hydrocarbons having a dielectric constant of less than about 3 is reacted, at room temperature, with a stoichiometric amount based on the acid group content of the polymer of a metal aliphatic alkoxide, so as to neutralize all the free acid groups and a sufficient fraction of the non polar solvent is distilled for removing, in a substantially quantitative manner, the aliphatic alcohol formed by said reaction.
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