Arkema France

Fabrice Montezin

Thibaut Montanari

Philippe Blondel

Vincent Ferreiro

Alexandre Vermogen

Sylvain Benet

An adhesive composition including predominantly one or two polyamide(s) having units chosen from: at least one unit denoted A with a mean number of carbon atoms per nitrogen atom, denoted CA, ranging from 4 to 8.5, advantageously from 4 to 7; at least one unit denoted B with a mean number of carbon atoms per nitrogen atom, denoted CB, ranging from 7 to 10, advantageously from 7.5 to 9.5; at least one unit denoted C with a mean number of carbon atoms per nitrogen atom, denoted CC, ranging from 9 to 18, advantageously from 10 to 18, and to the use thereof.

Adhesive composition and structure comprising at least one layer of said composition

An adhesive composition including predominantly one or two polyamide(s) having units chosen from: at least one unit denoted A having an average number of carbon atoms per nitrogen atom, denoted C, ranging from 4 to 8.5, advantageously from 4 to 7; at least one unit denoted B having an average number of carbon atoms per nitrogen atom, denoted C, ranging from 7 to 10, advantageously from 7.5 to 9.5; and at least one unit denoted C having an average number of carbon atoms per nitrogen atom, denoted C, ranging from 9 to 18, advantageously from 10 to 18, and to the use thereof.

The invention relates to an adhesive composition comprising the mass-weighted mean of the heats of fusion of these polyamides in the said composition being greater than 25 J/g (DSC), the mean number of carbon atoms per nitrogen atom of the polyamides A, B and C also satisfying the following strict inequality: C&#x3c;C&#x3c;C, and also to multilayer structures using the said composition.

Adhesive composition and structure comprising at least one layer of the said composition

The invention relates to an adhesive composition comprising at least one polyamide A, with a mean number of carbon atoms per nitrogen atom (C/N), noted C, of between 4 and 8.5; at least one polyamide B, with a melting point of greater than or equal to 180&#xb0; C. and a mean number C/N, noted C, of between 7 and 10; at least one polyamide C, with a mean number C/N, noted C, of between 9 and 18; at least 50% by weight of the said composition being formed from one or more polyamides chosen from polyamides A, B and C, the mass-weighted mean of the heats of fusion of these polyamides in the said composition being greater than 25 J/g (DSC), the mean number of C/N of the polyamides A, B and C satisfying the following strict inequality: C&#x3c;C&#x3c;C, and also to multilayer structures.

The invention relates to a multilayer structure comprising at least two layers: The invention also relates to a pipe comprising such a multilayer structure, and also to its use for transporting or storing fluids.

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Saint Aubin de Scellon, France

Fabrice Montezin