Institut Francais Du Pe'trole

Dominique Audigier

Paul Mariaggi

Henri Delhomme

Fr&eacute;d&eacute;rique Jacquemin-Hauviller

Valérie Sauvant-Moynot

Sébastien Duval

Fr&eacute;d&eacute;rique Hauviller

Frederique Jacquemin-Hauviller

Sylvie Schweitzer

Non-destructive method allowing in-situ evaluation, in a sensitive and reproducible way, for a given thermosetting composition, of the time left before gelation of said composition as a function of a quantity measuring its dielectric behavior.

Method of evaluating the time left before gelation of a thermosetting composition

A radially deployable flexible preform which, after deploying, forms a tubular structure that is curable by polymerization after positioning it in a well or in a line and moulds to the shape thereof after curing, comprises in its constitution at least one resin comprising in its chemical formula, at least one reactive multiple bond that is capable of subsequent reaction with compounds comprising in their constitution at least one terminal reactive multiple bond or a reactive multiple bond positioned at one end or the other of the molecular chain and/or on a pendant group. The long latent period heat curing resin has a glass transition temperature of at least 90&deg; C. and can be associated with at least one polymerizable oligomer and/or at least one monomer comprising at least one multiple bond in its chemical formula. The resin can also be associated with drying reducers or flow regulators ensuring optimum retention of the fiber/matrix ratio during pressing occurring on deployment of the expandable preform. These compositions optionally comprise post-polymerization shrinkage reducers. Normally, an unsaturated polyester resin or a vinyl ester resin is used, or a mixture of resins usually containing at least one of these resins.

Expandable and curable flexible preform containing unsaturated resins, for casing a well or a line

A thermosetting composition with a glass transition temperature of at least 100&deg; C. comprises at least one epoxy resin formed from at least one polyepoxide containing at least two epoxy groups in its molecule and at least one aromatic polyamine containing at least two primary amino groups in its molecule, at least one alkanoyl substituent containing 1 to 12 carbon atoms located in the position alpha to one of the amino groups. The molar ratio of the amine to the epoxide is such that each amine group corresponds to 1.6 to 2.6 epoxy groups. The composition also includes a flow controller. The composition can be used as a protective coating for any metallic or non metallic surface. The invention also concerns a flexible deployable preform comprising the composition.

Flexible deployable preform

A thermosetting composition with a glass transition temperature of at least 100&deg; C. comprises at least one epoxy resin formed from at least one polyepoxide containing at least two epoxy groups in its molecule and at least one aromatic polyamine containing at least two primary amino groups in its molecule, at least one alkyl substituent containing 1 to 12 carbon atoms located in the position alpha to one of the amino groups. The molar ratio of the amine to the epoxide is such that each amine group corresponds to 1.6 to 2.6 epoxy groups. The composition also includes a flow regenerator. The composition can be used as a protective coating for any metallic or non metallic surface. The invention also concerns a flexible deployable preform comprising the composition.

Thermosetting composition, uses thereof and a flexible deployable preform comprising the composition

Thermosetting compositions with improved latency are obtained by addition of a molten aromatic polyamine type curing agent to a liquid epoxy resin followed by cooling the mixture, causing the curing agent to form a suspension of fine particles in the epoxy resin by recrystallisation thereof. The compositions obtained can be used for the manufacture of prepregs with high latency for their use in processes requiring intermediate steps at 80.degree. C. over several hours.

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Vourles, France

Dominique Audigier