摘要:
The invention relates to a multilayer structure comprising at least two layers; a layer, referred to as the inner layer, intended to be in contact with a fluid, comprising a composition comprising at least one polymer and not comprising any copper, and a layer, referred to as the outer layer, intended to be in contact with the air, comprising a composition containing at least one polymer and at least one copper-based stabilizer. The invention also relates to a pipe comprising such a multilayer structure, and also to its use for transporting or storing fluids.
摘要:
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 CA, of between 4 and 8.5; at least one polyamide B, with a melting point of greater than or equal to 180° C. and a mean number C/N, noted CB, of between 7 and 10; at least one polyamide C, with a mean number C/N, noted CC, 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: CA
摘要:
The invention relates to a multilayer structure comprising at least two layers: a layer, referred to as the inner layer, intended to be in contact with a fluid, comprising a composition comprising at least one polymer and not comprising any copper, and a layer, referred to as the outer layer, intended to be in contact with the air, comprising a composition containing at least one polymer and at least one copper-based stabilizer. The invention also relates to a pipe comprising such a multilayer structure, and also to its use for transporting or storing fluids.
摘要:
The invention relates to an adhesive composition comprising at least one polyamide noted A, with a mean number of carbon atoms per nitrogen atom, noted CA, of between 4 and 8.5 and advantageously between 4 and 7; at least one polyamide noted B, with a melting point of greater than or equal to 180° C. and a mean number of carbon atoms per nitrogen atom, noted CB, of between 7 and 10 and advantageously between 7.5 and 9.5; at least one polyamide noted C, with a mean number of carbon atoms per nitrogen atom, noted CC, of between 9 and 18 and advantageously between 10 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 carbon atoms per nitrogen atom of the polyamides A, B and C also satisfying the following strict inequality: CA
摘要翻译:本发明涉及一种粘合剂组合物,其包含至少一种注明为A的聚酰胺,每个氮原子的平均碳原子数为CA,为4-8,有利地为4-7; 至少一种聚酰胺指出B,其熔点大于或等于180℃,每个氮原子的碳原子数,表示CB为7至10,有利地为7.5至9.5; 至少一种聚酰胺注意到C,每个氮原子的碳原子数,表示CC在9和18之间,有利地在10和18之间; 所述组合物的至少50重量%由一种或多种选自聚酰胺A,B和C的聚酰胺形成,所述组合物中这些聚酰胺的熔融热的质量加权平均值大于25J / g (DSC)中,聚酰胺A,B和C的每个氮原子的平均碳原子数也满足以下严格不等式:CA,以及使用所述组合物的多层结构。
摘要:
The invention relates to a multilayer structure including: a so-called outer layer (L1) consisting of a composition that primarily includes one or more semicrystalline copolyamides (H), the melting point of which is at least 220° C. and which contains at least 80 mol % of the following two units (s) and (a), wherein the (s) unit denotes one or more semiaromatic (s) units consisting of one of more sub-units from aromatic diacid (sr) and one or more sub-units from aliphatic diamine (sa) having 9 to 13 carbon atoms, and the (a) unit denotes one or more aliphatic units having 8 to 13 carbon atoms per nitrogen atom, the molar ratio (s)/(a) being 1 to 3; and a layer (L2) consisting of a composition primarily containing one or more tetrafluoroethylene (TFE) copolymers, said TFE copolymer being necessarily functionalized when layer (L2) is in contact with layer (L1) or with an intermediate layer that primarily includes one or more polyamides. The invention also relates to the uses of said multilayer structure for transporting fluids in the automotive field.