Abstract: The invention relates to a multilayer structure in which the inner layer is in contact with petrol or diesel fuel and comprising, in succession from the outside inwards: an outer layer made of, 50 to 100% of at least one polyamide A1 of formula X.Y/Z or 6.Y2/Z in which: “6” represents the residues of hexamethylene diamine, X denotes the residues of a C6-10 aliphatic, Y denotes the residues of an aliphatic C10-14 dicarboxylic acid, Y2 denotes the residues of an aliphatic C15-20 dicarboxylic acid, and Z denotes at least one unit chosen from the residues of a lactam, the residues of an ?,?-aminocarboxylic acid, the unit X1,Y1 in which X1 denotes the residues of an aliphatic diamine and Y1 denotes the residues of an aliphatic dicarboxylic acid, the weight ratios Z/(X+Y+Z) and Z/(6+Y2+Z) being between 0 and 15%, an inner PA-6 layer or a layer of a PA-6/polyolefin blend having a PA-6 matrix and optionally containing a conductor.

Abstract: 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 manufacture of the object comprises steps carried out hot between the Tg (glass transition temperature) and the Tm (melting point) of this microcrystalline polyamide; the transparency of the microcrystalline polyamide is such that the light transmission at 560 nm on a polished object 1 mm in thickness is greater than 80%, advantageously greater than 88%, the transparency being measured on the object obtained by standard processing methods, such as injection molding and sheet extrusion/calendering. 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° C.

Abstract: 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.

Abstract: 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 manufacture of the object comprises steps carried out hot between the Tg (glass transition temperature) and the Tm (melting point) of this microcrystalline polyamide; the transparency of the microcrystalline polyamide is such that the light transmission at 560 nm on a polished object 1 mm in thickness is greater than 80%, advantageously greater than 88%, the transparency being measured on the object obtained by standard processing methods, such as injection moulding and sheet extrusion/calendering. 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° C.

Abstract: The invention relates to a multilayer structure in which the inner layer is in contact with petrol or diesel fuel and comprising, in succession from the outside inwards: an outer layer made of, 50 to 100% of at least one polyamide A1 of formula X.Y/Z or 6.Y2/Z in which: “6” represents the residues of hexamethylene diamine, X denotes the residues of a C6-10 aliphatic, Y denotes the residues of an aliphatic C10-14 dicarboxylic acid, Y2 denotes the residues of an aliphatic C15-20 dicarboxylic acid, and Z denotes at least one unit chosen from the residues of a lactam, the residues of an ?,?-aminocarboxylic acid, the unit X1,Y1 in which X1 denotes the residues of an aliphatic diamine and Y1 denotes the residues of an aliphatic dicarboxylic acid, the weight ratios Z/(X+Y+Z) and Z/(6+Y2+Z) being between 0 and 15%, an inner PA-6 layer or a layer of a PA-6/polyolefin blend having a PA-6 matrix and optionally containing a conductor.

Abstract: 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 manufacture of the object comprises steps carried out hot between the Tg (glass transition temperature) and the Tm (melting point) of this microcrystalline polyamide; the transparency of the microcrystalline polyamide is such that the light transmission at 560 nm on a polished object 1 mm in thickness is greater than 80%, advantageously greater than 88%, the transparency being measured on the object obtained by standard processing methods, such as injection moulding and sheet extrusion/calendering.

Abstract: The invention relates to a composition, and structures having a layer made of said composition, in which the composition is, by weight, the total being 100%: 50 to 100% of at least one polyamide A1 of formula X.Y/Z or 6.Y2/Z in which: X denotes the residues of an aliphatic diamine having from 6 to 10 carbon atoms, Y denotes the residues of an aliphatic dicarboxylic acid having from 10 to 14 carbon atoms, Y2 denotes the residues of an aliphatic dicarboxylic acid having from 15 to 20 carbon atoms and Z denotes at least one unit chosen from the residues of a lactam, the residues of an ?,?-aminocarboxylic acid, the unit X1, Y1 in which X1 denotes the residues of an aliphatic diamine and Y1 denotes the residues of an aliphatic dicarboxylic acid, the weight ratios Z/(X+Y+Z) and Z/(6+Y2+Z) being between 0 and 15%; 0 to 40% of a plasticizer; 0 to 50% of an impact modifier; and 0 to 50% of a polyamide A2.

Abstract: “Composition composed of a mixture of: 60 to 99% by weight of a polymer component (A) formed from at least one of the homopolyamides and copolyamides: a) that are transparent and amorphous or present crystallinity such that the enthalpy of fusion during the second heating of an DSC ISO (delta Hm(2) is at most 30 J/g, the mass being related to the number of amide units contained or polyamide contained, this melting corresponding to that of the amide units; b) presenting a glass transition temperature (Tg) of greater than 90° C.

Abstract: The invention relates to a composition based on an impact-resistant polyamide thermoplastic resin, comprising, as a blend: from 60 to 98% by weight of polyamide resin (A) and from 2 to 40% by weight of a blend of at least one polyamide-block graft copolymer (B) composed of a polyolefin backbone and of at least one polyamide graft in which the grafts are attached to the backbone by the residues of an unsaturated monomer (X) having a functional group capable of reacting with an amine-terminated polyamide, the residues of the unsaturated monomer (X) being attached to the backbone by grafting or copolymerization via its double bond, and of a non-reactive ethylenic polymer (C) that is miscible with (B) and has a density of less than 0.960 g/cm3. This composition has improved impact resistance properties and also satisfactory melt flow. The invention also relates to the method of obtaining said composition and also to its use for manufacturing products or parts obtained by injection moulding or extrusion.

Abstract: The invention relates to a mixture comprising by weight, to give a total of 100%, 99-10% a polyamide block and polyether block copolymer (A) predominately consisting of lauryl lactam radicals, 1-99% at least on type of polymer (B) selected from polyamides other than polyamide 12, copolyamides which do not consist of the lauryl lactam radicals and the polyamide block and polyether block copolymers whose polyamide blocks do not predominantly consist of the lauryl lactam radicals. The articles, for example, films, foils, strings and tubes made from the inventive mixture are also disclosed.

Abstract: Transparent blend or alloy comprising, by weight, the total being 100%: (A) 1 to 99% of at least one copolymer constituent: which is amorphous or has a crystallinity ranging up to semicrystallinity; and which comprises: (A1) amide units, among which is at least one cycloaliphatic unit; (A2) flexible ether units; (B) 99 to 1% of at least one polymer constituent selected from: (Ba) semicrystalline copolyamides comprising amide units (Ba1) and comprising ether units (Ba2), (Bb) semicrystalline polyamides or copolyamides without ether units, (Bc) transparent polyamides or copolyamides without ether units, which are amorphous or weakly crystalline, and alloys based on such polyamides or copolyamides; and (C) 0 to 50% by weight of at least one polyamide, copolyamide, copolyamide comprising ether units or alloy based on such polyamides or copolyamides other than those used in (A) and (B) above.

Abstract: The present invention relates to amorphous transparent copolyamides of formula: PACM.T/D.X/X1.Y1 resulting from the condensation of PACM, terephtalic acid, a diamine D, a diacid X, a diamine X1 and a diacid Y1 in which: PACM denotes the p-bis(aminocyclohexyl)methane, T denotes terephtalic acid, D denotes a diamine chosen from aromatic, arylaliphatic and cycloaliphatic diamines, X denotes a diacid HOOC—(CH2)n—COOH having from 8 to 20 carbon atoms, X1 denotes an aliphatic diamine, Y1 denotes a diacid HOOC—(CH2)n—COOH having from 6 to 20 carbon atoms, the mol proportion of PACM.T is such as (PACM.T)/(PACM.T+D.X) is above 0.5, and can be increased to 1, the mol proportion of X1 is between 16% and 38%, X1.Y1 can be replaced partly or totally by Z, a lactam or an alpha-omega aminocarboxylic acid, having from 9 to 20 carbon atoms, and in this case the mol proportion of Z is between 33% and 75%.

Abstract: 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.

Abstract: A subject-matter of the present invention is a copolymer based on amide units and based on ether units, the amide units being composed predominantly of an equimolar combination of at least one diamine and of at least one dicarboxylic acid, the diamine or diamines being predominantly cycloaliphatic and the dicarboxylic acid or acids being predominantly linear aliphatic, it being possible for the amide units optionally to comprise, but to a minor extent, at least one other polyamide comonomer, the respective proportions of monomers of the ether and amide units being chosen so that: the said copolymer exhibits a high transparency which is such that the transmission at 560 nm through a sheet with a thickness of 2 mm is greater than 75%; the said copolymer exhibits a crystallinity such that the enthalpy of fusion during the second heating of an ISO DSC (delta Hm(2)) is at most equal to 30 J/g, the weight being with respect to the amount of amide units present or of polyamide present, this melting corresponding

Abstract: 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.

Abstract: The present invention relates to a novel polyamide alloy composition that is useful for forming objects that may be used for the storage and transport of fluids. The polyamide alloy is a blend of at least one polyamide and at least one modified polyolefin having both medium to hard and soft domains. The polyamide forms the continuous phase of the alloy. The alloy may also contain, and preferably does contain, a thermal and light stabilization compound, at least one unmodified polyolefin, and at least one plasticizer. The polyamide alloy composition is useful in forming tanks, hoses and tubes used in the transport of liquid or gaseous fluids, including fluids under pressure.

Abstract: The present invention relates to a multilayer hose for compressed air comprising, in this order: an outer layer (1) made of polyamide, optionally an intermediate layer (2) of a polymer having a flexural modulus of less than 500 MPa, an inner layer (3) of a polymer having a flexural modulus of greater than 1100 MPa, the inner layer (3) being in contact with the compressed air.

Abstract: The invention relates to a mixture comprising by weight, to give a total of 100%, 99-10% a polyamide block and polyether block copolymer (A) predominantly consisting of lauryl lactam radicals, 1-99% at least one type of polymer (B) selected from polyamides other than polyamide 12, copolyamides which do not consist of the lauryl lactam radicals and the polyamide block and polyether block copolymers whose polyamide blocks do not predominantly consist of the lauryl lactam radicals. The articles, for example, films, foils, strings and tubes made from the inventive mixture are also disclosed.

Abstract: The invention relates to a polyamide-based thermoplastic composition comprising, by weight: 50 to 98 parts of a polyamide (A1) nondiamine; 0.2 to 40 parts, preferably 0.2 to 9 parts, of a polyamide (A2) diamine, said polyamide (A2) being different from the polyamide (A1) and the ratio by mass (A2)/(A1) being less than 1; 1 to 60 parts, preferably 1 to 30 parts, of a reactive impact modifier (B) or of a blend of modifiers comprising at least one reactive impact modifier (B) or of a blend (B?) comprising at least one impact modifier and at least one reactive modifier. It also relates to an impact modifier composition and to the process for the preparation of a thermoplastic composition according to the invention using such an impact modifier composition.

Abstract: The invention relates to a transparent composition comprising, by weight, the total being 100%: 5 to 40% of an amorphous polyamide (B) which results essentially from the condensation: either of at least one diamine chosen from cycloaliphatic diamines and aliphatic diamines and of at least one diacid chosen from cycloaliphatic diacids and aliphatic diacids, at least one of these diamine or diacid units being cycloaliphatic, or of a cycloaliphatic ?,?-aminocarboxylic acid, or of a combination of these two possibilities, and optionally of at least one monomer chosen from ?,?-aminocarboxylic acids or the possible corresponding lactams, aliphatic diacids and aliphatic diamines, 0 to 40% of a supple polyamide (C) chosen from copolymers containing polyamide blocks and polyether blocks and copolyamides, 0 to 20% of a compatabilizer (D) for (A) and (B), 0 to 40% of a supple modifier (M), with the condition that (C)+(D)+(M) is between 0 and 50%, the remainder to 100% being a semi-crystalline polyamide (A).