Arkema France

Vincent Ferreiro

Thibaut Montanari

Fabrice Montezin

Alexandre Vermogen

Philippe Blondel

Thierry Briffaud

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 composition including: 45 to 95 wt % of a semi-aromatic copolyamide containing at least two separate units having the following general formulation: A/X.T, where A is selected from among a unit obtained from an amino acid, a unit obtained from a lactam, and a unit having the formula (diamine Ca).(diacid in Cb), and XT denotes a unit obtained from the polycondensation of a diamine in Cx and from terephthalic acid, with x being the number of carbon atoms of the diamine in Cx, said copolyamide having a polymoleoularity index, noted Ip, of less than or equal to 3.5, measured by gel permeation chromatography, and an amino chain end content of between 0.020 meg/g and 0.058 meg/g; and 5 to 55 wt % of at least one cross-linked polyolefin. The invention also relates to a method for preparing said composition and to the uses thereof.

Composition including a copolyamide and a cross-linked polyolefin

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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Pont du Chateau, France

Vincent Ferreiro