Rhodia Operations

Rabih Rached

Pierre Marcel Ardaud

Thierry Vidal

Massimo Guglieri

Arnaud Cadix

Galder Cristobal

Chi-Thanh Vuong

Bertrand Pavageau

Amaud Cadix

Thierry Alban Marcel Vidal

Pierre Ardaud

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.

Encapsulated activator and its use to trigger a gelling system by physical means

The invention relates to a method for producing a (meth)acrylic anhydride A-C(&#x2550;O)&#x2014;O&#x2014;(O&#x2550;)C-A, comprising the following steps: a) a step of reacting an anhydride B&#x2014;C(&#x2550;O)&#x2014;O&#x2014;(O&#x2550;)C&#x2014;B with an acid A-COOH, resulting in the formation of mixed anhydride A-C(&#x2550;O)&#x2014;O&#x2014;(O&#x2550;)C&#x2014;B and acid B&#x2014;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(&#x2550;O)&#x2014;O&#x2014;(O&#x2550;)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(&#x2550;O)&#x2014;O&#x2014;(O&#x2550;)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.

Synthesis of (meth) acrylic anhydride by transanhydrization

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&#xb0; 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. for sealing subterranean environments or consolidation of a soil or sealing of a subterranean structure.

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&#xb0; C. or higher.

Process for preparing esteramide compounds

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 present invention relates to a process for preparing an anhydride of formula A-C(&#x2550;O)&#x2014;O&#x2014;(O&#x2550;)C-A, where A is &#x2014;CR&#x2550;CH2 and R is &#x2014;H or &#x2014;CH3, comprising: a) a step of reacting an anhydride B&#x2014;C(&#x2550;O)&#x2014;O&#x2014;(O&#x2550;)C&#x2014;B with an acid A-COOH, A being as defined above, wherein the step results in the formation of an anhydride A-C(&#x2550;O)&#x2014;O&#x2014;(O&#x2550;)C&#x2014;B and of an acid B&#x2014;COOH, A and B being such that said acid B&#x2014;COOH is more volatile than said acid A-COOH, and b) a step of reacting said anhydride A-C(&#x2550;O)&#x2014;O&#x2014;(O&#x2550;)C&#x2014;B with the acid A-COOH under conditions such that the amount of acid B&#x2014;COOH is less than the amount of acid A-COOH, resulting in the formation of the anhydride A-C(&#x2550;O)&#x2014;O&#x2014;(O&#x2550;)C-A, in which said reaction steps are carried out in the presence of an acid catalyst which is more volatile than said anhydride A-C(&#x2550;O)&#x2014;O&#x2014;(O&#x2550;)C-A.

Synthesis of (meth)acrylic anhydride by transanhydrization

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.

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Millery, France

Rabih Rached