Abstract: The present disclosure relates to aqueous gelling systems comprising an encapsulated polymerization accelerator with water soluble or dispersable monomers comprising acrylated or methacrylated polyethylene and/or polyoxypropylene monomers and a polymerization initiator dispersed in said monomers, useful i.a. for sealing subterranean environments or consolidation of a soil or sealing of a subterranean structure.

Abstract: The invention relates to a method for producing a (meth)acrylic anhydride A-C(?O)—O—(O?)C-A, comprising the following steps: a) a step of reacting an anhydride B—C(?O)—O—(O?)C—B with an acid A-COOH, resulting in the formation of mixed anhydride A-C(?O)—O—(O?)C—B and acid B—COOH; and b) a step of reacting the mixed anhydride with A-COOH, resulting in the (meth)acrylic anhydride. According to the invention, reaction steps (a) and (b) are carried out in the presence of hydrated triflic acid, and the anhydride A-C(?O)—O—(O?)C-A is isolated from the reaction medium produced in step (b) as follows: e1) heavy compounds having a volatility less than or equal to that of the anhydride A-C(?O)—O—(O?)C-A are separated from the reaction medium, said compounds including the anhydride and the hydrated triflic acid; e2) the anhydride is separated from the heavy compounds by difference in volatility.

Abstract: A process allowing the encapsulation of a polymerization accelerator comprising the steps of: a) providing an reverse emulsion containing, in an oil phase, a water solution/dispersion containing the polymerisation activator, the oil phase including a heat curable mixture of an isocyanate and a polyalkyldiene hydroxylated or polyol, b) pouring the reverse emulsion in a water phase to make a multiple emulsion water/oil/water, containing drops of activators as the internal water phase, and then, c) heating the multiple emulsion obtained in step b) to cure the polyisocyanate in polyurethane and obtain drops of activator enclosed in shells of polyurethane dispersed in water. The invention also relates to aqueous gelling systems comprising the encapsulated polymerization accelerator with water soluble or dispersable monomers and a polymerization initiator dispersed in said monomers, useful i.a. for sealing subterranean environments or consolidation of a soil or sealing of a subterranean structure.

Abstract: A process allowing the encapsulation of a polymerization accelerator comprising the steps of: a) providing an reverse emulsion containing, in an oil phase, a water solution/dispersion containing the polymerization activator, the oil phase including a heat curable mixture of an isocyanate and a polyalkyldiene hydroxylated or polyol, b) pouring the reverse emulsion in a water phase to make a multiple emulsion water/oil/water, containing drops of activators as the internal water phase, and then, c) heating the multiple emulsion obtained in step b) at a temperature of between 50 and 95° C., in order to cure the polyisocyanate in polyurethane and obtain drops of activator enclosed in shells of polyurethane dispersed in water. The invention also relates to aqueous gelling systems comprising the encapsulated polymerization accelerator with water soluble or dispersable monomers and a polymerization initiator dispersed in said monomers, useful i.a.

Abstract: The invention relates to a method for producing a (meth)acrylic anhydride A-C(?O)—O—(O?)C-A, comprising the following steps: a) a step of reacting an anhydride B—C(?O)—O—(O?)C—B with an acid A-COOH, resulting in the formation of mixed anhydride A-C(?O)—O—(O?)C—B and acid B—COOH; and b) a step of reacting the mixed anhydride with A-COOH, resulting in the (meth)acrylic anhydride. According to the invention, reaction steps (a) and (b) are carried out in the presence of hydrated triflic acid, and the anhydride A-C(?O)—O—(O?)C-A is isolated from the reaction medium produced in step (b) as follows: e1) heavy compounds having a volatility less than or equal to that of the anhydride A-C(?O)—O—(O?)C-A are separated from the reaction medium, said compounds including the anhydride and the hydrated triflic acid; e2) the anhydride is separated from the heavy compounds by difference in volatility.

Abstract: The present invention concerns a process for preparing esteramide compounds. More particularly, the invention relates to a process for preparing esteramide compounds by reaction between a diester and an amine, in the presence of a basic compound, wherein the basic compound and the amine in gaseous form are co-added to the diester, the reaction being conducted at a temperature of 30° C. or higher.

Abstract: The present invention relates to a method for preparing esteramide compounds. More particularly, the invention relates to a method for preparing esteramide compounds by reaction between a diester and an amine, in the presence of a basic compound, wherein the amine is solubilized in an organic solvent or in the diester, when the amine is solubilized in an organic solvent, the diester is added onto the reaction mixture comprising the amine and the basic compound, when the amine is solubilized in the diester, the basic compound is added onto the reaction mixture comprising the amine and the diester (II), the reaction is conducted at a temperature greater than or equal to 30° C., the amine is present in molar excess ranging from 0.01 to 50% relatively to the diester.

Abstract: A process allowing the encapsulation of a polymerization accelerator comprising the steps of: a) providing an reverse emulsion containing, in an oil phase, a water solution/dispersion containing the polymerisation activator, the oil phase including a heat curable mixture of an isocyanate and a polyalkyldiene hydroxylated or polyol, b) pouring the reverse emulsion in a water phase to make a multiple emulsion water/oil/water, containing drops of activators as the internal water phase, and then, c) heating the multiple emulsion obtained in step b) at a temperature of between 50 and 95° C., in order to cure the polyisocyanate in polyurethane and obtain drops of activator enclosed in shells of polyurethane dispersed in water. The invention also relates to aqueous gelling systems comprising the encapsulated polymerization accelerator with water soluble or dispersable monomers and a polymerization initiator dispersed in said monomers, useful i.a.

Abstract: The present invention relates to a method for preparing esteramide compounds. More particularly, the invention relates to a method for preparing esteramide compounds by reaction between a diester and an amine, in the presence of a basic compound, wherein the amine is solubilized in an organic solvent or in the diester, when the amine is solubilized in an organic solvent, the diester is added onto the reaction mixture comprising the amine and the basic compound, when the amine is solubilized in the diester, the basic compound is added onto the reaction mixture comprising the amine and the diester (II), the reaction is conducted at a temperature greater than or equal to 30° C., the amine is present in molar excess ranging from 0.01 to 50% relatively to the diester.

Abstract: The present invention concerns a process for preparing esteramide compounds. More particularly, the invention relates to a process for preparing esteramide compounds by reaction between a diester and an amine, in the presence of a basic compound, wherein the basic compound and the amine in gaseous form are co-added to the diester, the reaction being conducted at a temperature of 30° C. or higher.

Abstract: The present invention relates to a process which comprises preparing polymers. The process uses an appropriate installation, and may comprise determining at least one parameter of a physical and/or chemical conversion. The invention also relates to a corresponding screening process. According to this process, a polymerization reaction medium is made to flow in a tubular flow member.

Abstract: The present invention relates to a process which comprises preparing polymers. The process uses an appropriate installation, and may comprise determining at least one parameter of a physical and/or chemical conversion. The invention also relates to a corresponding screening process. According to this process, a polymerization reaction medium is made to flow in a tubular flow member (12).