摘要:
The present invention relates to a multilayer structure comprising a transparent polyamide-based layer and a layer based on a thermoplastic polyurethane (TPU). The invention also relates to a decorated article consisting of an object to which the above structure has been bonded, the polyamide layer being on the outside. According to another embodiment, the polyamide/TPU structures may be bonded to a polyurethane foam or to a polyurethane resin. It is also possible to overmould the polyurethane foam or the polyurethane resin to the polyamide/TPU structure placed in a mould, the polyamide layer being adjacent to the mould wall. The structure obtained is useful, for example for making skis or sports shoes. The invention also relates to these structures. Advantageously, the polyamide layer is semicrystalline. Advantageously, the TPU layer is transparent. Each of the layers may be formed from several layers.
摘要:
The present invention relates to a polyamide-based multilayer structure comprising in succession: an upper layer made of a transparent polyamide coming from the condensation: either of a lactam or of an α,Ω-amino acid having at least 9 carbon atoms or of a diamine and of a diacid, at least one having at least 9 carbon atoms; a lower layer capable of adhering to the substrate and optionally, an intermediate tie layer (also called a central layer) between the upper layer and the lower layer, each of the layers exhibiting thermomechanical behaviour (strength as a function of temperature) sufficiently similar to allow the structure to be easily formed under the effect of the temperature. The invention also relates to the objects consisting of these substrates covered with these structures, the lower layer being placed against the substrate.
摘要:
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 to that of the amide units; the said copolymer has a glass transition temperature at least equal to 75° C.
摘要:
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 α,ω-aminocarboxylic acid, or of a combination of these two possibilities, and optionally of at least one monomer chosen from α,ω-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). The invention also relates to the articles obtained, such as plates, films, sheets, tubes and profiles, the articles obtained by injection moulding and in particular the films and sheets which are then bonded to skis.The invention also relates to the above articles decorated, for example, by sublimation, and coated with a transparent protective layer consisting of the composition of the invention.
摘要:
A composition comprising, by weight, the total being 100%: 5 to 40% of an amorphous polyamide (B) which results from the condensation of at least one aromatic diacid and with at least one diamine said diamine being optionally cycloaliphatic, and, optionally with at least one monomer chosen from: α,ω-aminocarboxylic acids, aliphatic diacids, aliphatic diamines, 0 to 40% of a supple polyamide (C) chosen from copolymers containing polyamide blocks, polyether blocks and copolyamides, 0 to 20% of a compatibilizer (D) for (A) and (B), (C)+(D) is between 2% and 50%, with the condition that (B)+(C)+(D) is not less than 30%, and the difference to 100% is made up with a semi-crystalline polyamide (A). This composition can be molded into transparent sheets treated by a sublimation printing process at relatively low temperatures.
摘要:
Colpolyamides resulting from the polycondensation of a mixture of (a) dodecanelactam (L12) or of 12-aminododecanoic acid (A12) and of (b) 11-aminoundecanoic acid (A11) are characterized in that the monomer L12 or A12 represents 1 to 15% or 85 to 99% by weight of the mixture, and the copolyamides have melting points (mp) as a function of the composition, the units originating from the monomer A12 and L12 being in a majority or minority respectively:(1) A12 or L12 is a majority: mp (.degree. C.).gtoreq.176-0.567.times.(% A11)(2) A12 or L12 is a majority: mp (.degree.).gtoreq.187-0.5.times.(% A12 or L12),the melting points being determined by taking the peaks of the exotherm signals obtained in differential thermal analysis with a rate of heating of 10.degree. C./minute for the second heating run. Such copolyamides have a property of resilience at low temperature and a property of improved suppleness, especially when plasticizer is added to them. Their ductile/brittle transition temperature is shifted towards a lower temperature.
摘要:
The invention relates to a thermoplastic composition comprising at least one polymer (M) forming a matrix in which are dispersed nodules of at least one polymer (K) which are encapsulated in at least one polymer (S) in such a way that these encapsulated nodules are smaller than the nodules of the polymer (S) which are dispersed in the matrix (M).
摘要:
The invention relates to a composition based on an impact-resistant thermoplastic polyamide resin, comprising, as a blend—from 60 to 98 wt % of polyamide resin (A) and—from 2 to 40 wt % of a blend of at least one graft copolymer with polyamide blocks (B) composed of a polyolefin backbone and 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 below 0.960 g/cm3.
摘要:
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.
摘要:
“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.; and c) composed at least in part of cycloaliphatic and/or aromatic units, and/or alloys based on at least one previously cited homopolyamide or copolyamide, said alloys being amorphous or presenting crystallinity meeting the same definition as hereinabove; 40 to 1% by weight of a polymer component (B) formed by at least one copolyamide based on ether units and amide units; the polymer components (A)+(B) representing 100% by weight; where at least one among (A) and (B) may additionally contain at least one additive usual for thermoplastic polymers and copolymers, without the content of said additive or additive(s) in each of the polymer components (A) and (B) representing more than 30% by weight of the said polymer component.”