Arkema France

Michaela Steng

Anthony Bonnet

Michael Werth

Nicolas Amouroux

Karine Triballier

Fabrice Chopinez

Pascal Sebire

The present invention relates to a method for radiation grafting a compound by irradiation, that can be grafted onto a fluoropolymer, so as to prevent destabilization of the fluorinated polymer. Said method comprises the following steps: a) the fluoropolymer is mixed in the melted state thereof with a graftable compound; b) the mixture obtained in a) is converted into films, plates, granulates or powder; c) the products from step b) are subjected to photonic (&#x3b3;) or electronic (&#x3b2;) irradiation in a dose of between 0.5 and 15 Mrad; and d) optionally, the products from step c) are washed and/or a degassed. According to said method, a stabilizing agent is added to the fluorinated polymer. Said stabilizing agent can be an antioxidant, a graftable metal salt, or a combination of the two. The invention also relates to structures comprising at least one layer of said mixtures and at least one layer of another material, and to the use of said structures to obtain a barrier effect. Said structures act as a barrier to a plurality of fluids, especially to petrol and to air-conditioning fluids, and can take the form of bottles, tanks, containers, pipes, and all kinds of recipients. They can also be transformed into films used to produce packaging.

Method for grafting a fluorinated polymer and multilayer structures comprising said grafted fluoropolymer

The present invention relates to a multilayer tube comprising, in its radial direction from the outside inwards:

Polyamide-based multilayer tube for transferring fluids

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Bernay, France

Michaela Steng