Arkema France

Arkema Inc.

Atofina

Rkema

Christelle Recoquille

Thibaut Montanari

Bertrand Verbauwhede

Nicolas Dufaure

Florent Dechamps

The present invention relates to a multilayer tubular structure (MLT) intended for the transport of fluids, in particular of petrol, especially alcohol-containing petrol, comprising, from the outside inwards, at least one barrier layer (1) and at least one inner layer (2) located below the barrier layer,

Multilayer tubular structure having better resistance to extraction in biofuel and use thereof

A multilayer tubular structure (MLT) for transport of alcohol-containing petrol. The MLT from the outside inwards has at least one barrier layer and at least one inner layer located below the barrier layer. The inner layer, or all the layers contain on average at most 1.5% of plasticizer relative to the total weight of the composition of each layer or to the total weight of all the compositions of the layers. The inner layer is predominantly made of at least one polyamide having more than 75% aliphatic units. The aliphatic polyamide has a mean number of carbon atoms per nitrogen atom selected from the following:

A multilayer tubular structure MLT intended for the transport of petrol. The MLT has at least one inner barrier layer and at least one outer layer located above the barrier layer. All the layers located above the barrier layer contain from 0 to 5% of plasticizer relative to the total weight of the composition of the layer. The outer layer is predominantly at least one aliphatic polyamide. The polyamide(s) has a number of carbon atoms per nitrogen atom selected from the following:

Provided is a method of determining whether a multilayer tubular structure (MLT) satisfies an extractables test by filling the multilayer tubular structure MLT with an alcohol-containing petrol of FAM B type to obtain a filled MLT and measuring the amount of extractable material. The MLT satisfies the extractables test when the residue of the filtrate is less than or equal to 6 g/mof the inner surface area of the MLT.

The present invention relates to the use of a microcrystalline polyamide for obtaining an object having all or part of its outer surface formed from this microcrystalline polyamide and having a particular surface finish, in which: Advantageously, the microcrystalline polyamide is such that its degree of crystallinity is greater than 10% and less than 30% (1st DSC heating according to ISO 11357 at 40&#xb0; C./min) and the enthalpy of melting is greater than 25 J/g and less than 75 J/g (1st DSC heating according to ISO 11357 at 40&#xb0; C./min). Preferably, it such that its T(glass transition temperature) is between 40&#xb0; C. and 90&#xb0; C. and its T(melting point) is between 150&#xb0; C. and 200&#xb0; C. Advantageously, it results from the chain-linking of monomers such that 50% or more, by weight, of these monomers are &#x2267;C9 monomers (i.e. having a number of carbon atoms equal to 9 or higher).

Use of a microcrystalline polyamide to obtain a particular surface finish

The present invention relates to the use of a microcrystalline polyamide for obtaining an object having all or part of its outer surface formed from this microcrystalline polyamide and having a particular surface finish, in which:

The invention relates to a transparent composition comprising, by weight, the total being 100%: The invention also relates to the articles obtained, such as plates, films, sheets, tubes and profiles, the articles obtained by injection moulding and in particular the films and sheets which are then bonded to skis. The invention also relates to the above articles decorated, for example, by sublimation, and coated with a transparent protective layer consisting of the composition of the invention.

Polyamide-based transparent composition

A composition comprising, by weight, the total being 100%:

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Nassandres, France

Christelle Recoquille