Polyamide (PA) based on a multi-ring cycloaliphatic dicarboxylic acid monomer

Abstract

The invention relates to a polyamide (PA) exhibiting a glass transition temperature (Tg) determined according to ASTM D3418 of at least 100.0°C and comprising recurring units (RPA) of formula: where:  X is a bond or –(CRaRb)2- where and Ra and Rb are independently selected in the group of H and (C1-C2)-alkyl group;  R1 designates the divalent radical derived from at least one C8-C16 diamine (DA) selected in the group of (i) aliphatic diamines of formula 2HN-Alk-NH2 where Alk designates a linear or branched alkylene group, (ii) diamines containing one or two cyclohexane rings and (iii) combination thereof; where the proportion of recurring units (RPA) in polyamide (PA) is at least 30.0 mol%, preferably at least 45.0 mol%, this proportion being based on the total amount of recurring units in polyamide (PA).

Description

Polyamide (PA) based on a multi-ring cycloaliphatic dicarboxylic acid monomerThis application claims priority of US provisional application N°63 / 571 ,920 filed on 29 March 2024 and European patent application N°24176694.8 filed on 17 May 2024, the content of which being entirely incorporated herein by reference for all purposes. In case of any incoherency between this application and one of the priority applications that would affect the clarity of a term or expression, it should be made reference to this application only.

[0001] The present disclosure relates to a polyamide (PA) comprising recurring units based on a multi-ring cycloaliphatic dicarboxylic acid monomer.[Technical problem to be solved]

[0002] Many articles of our daily life, such as containers, need to exhibit a high glass transition temperature (Tg) and a high carbon to nitrogen (C / N) ratio to minimize water-uptake and thus enable mechanical property retention even when used at high temperature. In many instances, such articles may also need to exhibit resistance to UV radiation.

[0003] Several polyamides based on 4,4'-methylene bis(2-methylcyclohexylamine) (MACM) or 4,4'-diaminodicyclohexylmethane (PACM) are already commercialized and exhibit a high Tg:Yet, MACM or PACM are both suspected of exhibiting some acute toxicity (see the REACH profile of these two monomers on https: / / echa.europa.eu / ). Moreover, for the polyamides comprising terephthalic and / or isophtalic acid, a high proportion of recurring units comprising an aromatic moiety is known to have a deleterious effect on the resistance to UV radiation (indeed, the primary photoreaction involves excitation of conjugated carbonyl groups- phenylene rings; see European Polymer Journal 1981, 17(8), 919-933).

[0004] There is therefore a need to find a polyamide which is not derived from MACM and / or PACM and which exhibits a Tg higher than 100°C, a low water uptake and resistance to UV radiation.

[0005] The polyamide and the polymer composition of the invention aim at solving this technical problem.[Background art]

[0006] US 3,505,2811 discloses a polyester based on [1 ,1 '-bi(cyclohexane)]-4,4'- dicarboxylic acid (BCDA).

[0007] US 3,472,818 (D1 ) discloses a polyamide of generic formula:where R is a member of the class consisting of hydrogen and methyl and R' is an organic alkylene radical containing from 6 to 16 carbon atoms. D1 does not disclose the same type of recurring units (RPA) as in polyamide (PA) of the invention.[Brief disclosure of the invention]

[0008] The invention is defined in the appended set of claims.

[0009] The invention relates to a polyamide (PA) as defined in any one of claims 1 -38.

[0010] The invention also relates to a method of preparation of a polyamide (PA) as defined in claim 39.

[0011] The invention also relates to a polymer composition (C) as defined in claims 40-42.

[0012] The invention also relates to a use as defined in claim 43.

[0013] The invention also relates to an article as defined in claim 44.

[0014] More precisions and details about these subject-matters are now provided below.

[0015] Mol.% is percentage by mole; wt.% is a percentage by weight.

[0016] When numerical ranges are given herein, unless otherwise expressly indicated, the end-points of the ranges (even in the open-ended ranges such as those comprising "at least", "at most", "lower than", "up to", etc or in ranges comprising "between") are included. The expression "at least" therefore corresponds to the mathematical symbol > in the context of the present invention. The expression "at most" therefore corresponds to the mathematical symbol < in the context of the present invention. For clarity then, the ranges comprising the expression "between X and Y” are thus equivalent to "from X to Y”.

[0017] The proportions of recurring units in a polymer are expressed in mol% and given relative to the total amount of recurring units in said polymer.

[0018] In the present application, unless otherwise indicated, any specific embodiment or technical feature relating to one of the subject-matters of the invention (e.g. polyamide (PA) or polymer composition (C)) is applicable to or interchangeable with another embodiment or technical feature (i) also relating to said subject-matter or relating to another subject-matter of the invention and (ii) disclosed elsewhere in the application.

[0019] Likewise, in the present application, unless otherwise indicated, any specific embodiment or technical feature relating to a subject-matter is applicable to another embodiment or technical feature of the same subject-matter or to another subject-matter.

[0020] The term "amorphous" means in the context of the invention that the heat of fusion (Hm) of polyamide (PA) as determined according to ASTM D3418 is lower than or equal to 5.0 J / g.

[0021] The term "semi-crystalline" means in the context of the invention that the heat of fusion (Hm) of polyamide (PA) as determined according to ASTM D3418 is strictly higher than 5.0 J / g.

[0022] As used herein, the terminology ‘(Cn-Cm)’ in reference to an organic group, wherein n and m are integers, respectively, indicates that the group may contain from n carbon atoms to m carbon atoms per group, n and m being included.

[0023] The recurring units of polyamide (PA) are linked to one another by amide bonds.

[0024] The compositions of the polyamides disclosed herein are sometimes given by reference to their constituting monomers (eg IPDA / TMD-BCDA / 15). For clarity, this means that said monomers are present in the polyamides in polymerized form. This means also that the proportions of monomers indicated correspond to the proportions of monomers present in the polyamide (PA) in polymerized form after polycondensation.

[0025] Likewise, the proportions of monomers are sometimes given by reference to the proportions in the diamine component (A) and in the dicarboxylic acid component (B). Those proportions can be translated into and correspond to the proportions of monomers present in the polyamide (PA) in polymerized form after polycondensation.

[0026] Y designates a dicarboxylic acid of formula HOOC-(CH2)y-COOH where y is an integer between 7 and 40 or between 7 and 16.

[0027] The following acronyms are used in the present disclosure:[Disclosure of the invention]

[0028] As a first aspect, the invention relates to a polyamide (PA) as defined in any one of the appended claims.

[0029] Polyamide (PA) exhibits a glass transition temperature (Tg) determined according to ASTM D3418 of at least 100.0°C and comprising recurring units (RPA) of formula:where:■ X is o a bond; or o - (CRaRb)x- where x is 2 and Raand Rb are independently selected in the group of H and (Ci-C2)-alkyl group;■ Ri designates the divalent radical derived from at least one Cs-C diamine (DA) selected in the group of (i) aliphatic diamines of formula 2HN-Alk-NH2 where Aik designates a linear or branched alkylene group, (ii) diamines containing one or two cyclohexane rings and (iii) combination thereof; and where the proportion of recurring units (RPA) in polyamide (PA) is at least 30.0 mol%, preferably at least 45.0 mol%, this proportion being based on the total amount of recurring units in polyamide (PA).

[0030] (RPA) results from the condensation of at least one diamine (DA) of formula H2N-R1-NH2 and at least one dicarboxylic acid (DI) of formulaX has the meaning provided above [X= bond or -(CRaRb)2-].

[0031] Polyamide (PA) is preferably free of recurring units derived from MACM or PACM. The expression "free of" means that the proportion of said units is lower than or equal to 1 .5 mol% (<1 .5 mol%), preferably lower than or equal to 1 .0 mol% (<1 .0 mol%), preferably lower than or equal to 0.5 mol% (<0.5 mol%). Polyamide (PA) preferably does not comprise recurring units derived from MACM or PACM.

[0032] Polyamide (PA) preferably does not comprise units derived from a lactam or an aminoacid.

[0033] Details about the diamine (DA) and the dicarboxylic acid (DI) are now given below.

[0034] About diamine (DA)

[0035] The Cs-C diamine (DA) is of formula H2N-R1-NH2 and is selected in the group of (i) aliphatic diamines of formula H2N-Alk-NH2 where Aik designates a linear or branched alkylene group, (ii) diamines containing one or two cyclohexane rings and (iii) combination thereof.

[0036] Diamine (DA) may be (i) an aliphatic diamine of formula H2N-Alk-NH2 where Aik designates a Cs-C linear or branched alkylene group. Aik is more particularly a Cs-C linear or branched alkylene group. DA may for instance be H2N-(CH2)8-NH2, H2N-(CH2)9-NH2, H2N-(CH2)IO-NH2, H2N-(CH2)i2-NH2,2,2,4-trimethyl-1 ,6-hexanediamine (2,2,4-TMD), 2,4,4-trimethyl-1 ,6- hexanediamine (2,4,4-TMD).

[0037] Diamine (DA) may be (ii) a diamine containing one or two cyclohexane rings. DA may more particularly be one of the following diamines: IPDA (isophorone diamine), 1 ,3-BAC (1 ,3-bis(aminomethyl)cyclohexane), 1 ,4- BAC (1 ,4-bis(aminomethyl)cyclohexane), having respective formula:

[0038] IPDA may be cis, trans or a combination of cis and trans. IPDA may for instance be a combination of cis and trans with a ratio cis / trans between 50 / 50 and 99 / 0. Likewise, 1 ,3-BAC and 1 ,4-BAC are also typically in the form of a mixture of cis and trans isomers. It is also noted that 2,2,4-TMD is generally associated with 2,4,4-TMD in the form of a mixture (see Examples).

[0039] The diamine (DA) can be more particularly selected in the group of H2N- (CH2)9-NH2, H2N-(CH2)IO-NH2, H2N-(CH2)i2-NH2, 2, 2, 4-trimethyl-1 ,6- hexanediamine (2,2,4-TMD), 2, 4, 4-trimethyl-1 ,6-hexanediamine (2,4,4- TMD), IPDA, 1 ,3-BAC, 1 ,4-BAC and combination thereof.

[0040] 2,2,4-TMD can be represented by formula:2,4,4-TMD can be represented by formula:

[0041] Diamine (DA) may be (iii) a combination of diamines selected in the group of diamines (i) and / or in the group of diamines (ii).

[0042] Diamine (DA) is more particularly selected in the group of the diamines disclosed in Table II.

[0043] (RPA) may be derived from one or more diamines (DA) as defined above or herein.

[0044] About dicarboxylic acid (DI) (multi-ring cycloaliphatic dicarboxylic acid monomer)

[0045] DI is the dicarboxylic acid of formulawhere X has the meaning indicated herein.

[0046] According to an embodiment, X is a bond and the two cyclohexyl groups are directly bonded to one another by a bond. DI is then [1 ,1'- bi(cyclohexane)]-4,4'-dicarboxylic acid (BCDA) of formula:

[0047] DI may be any one of the stereo isomers of BCDA, more particularly (trans, frans)-[1 ,1 '-bi(cyclohexane)]-4,4'-dicarboxylic acid (CAS N°16200-85-4) of formula:(also noted f,f-BCDA).

[0048] According to an embodiment, X= -(CRaRb)2-. In this case, the two cyclohexyl groups of the dicarboxylic acid (DI) are bonded by the alkylene group of formula -(CRaRb)2-. The two Raand the two Rb are independentlyselected in the group of H and (Ci-C2)-alkyl group. Raand Rb may be both be H or CH3.

[0049] According to an embodiment of the present disclosure, the dicarboxylic acid (DI) is [4, 4'-(ethane-1 ,2-diyl)bis(cyclohexane-1 -carboxylic acid) (EDCA) of formula:

[0050] Both BCDA and EDCA may adopt different spatial configurations (eg BCDA may adopt configuration f,f-BCDA). It is also possible to use for BCDA or EDCA a mixture of isomers.

[0051] In the context of the present invention, a combination of BCDA and EDCA is also possible and would not be outside of the scope of the present invention.

[0052] The proportion of recurring units (RPA) in polyamide (PA) is at least 30 mol%, preferably at least 45.0 mol%.

[0053] According to an embodiment of the present disclosure, this proportion may more particularly be:- at least 60.0 mol%; or- at least 70.0 mol%; or- at least 80.0 mol%; or- at least 90.0 mol%; or- at least 95.0 mol%.

[0054] Polyamide (PA) may comprise other recurring units (RPA*) different from units (RPA). Recurring units (RPA*) are selected in the units derived from a lactam, units derived from an aminoacid (e.g. aminoundecanoic acid), units derived from the condensation of a diamine and a dicarboxylic acid and combination thereof. The proportion of said units (RPA*) in polyamide (PA) is at most 70.0 mol% or at most 55.0 mol%.

[0055] The recurring units of polyamide (PA) consist of units (RPA) and optional units (RPA*).

[0056] The proportion of aromatic recurring units in polyamide (PA) is preferably lower than or equal to 5.0 mol%, preferably lower than or equal to 1 .0 mol%,preferably lower than 0.5 mol%. According to an embodiment, polyamide (PA) does not comprise aromatic recurring units. The expression "aromatic recurring unit" denotes a recurring unit comprising at least one aromatic moiety. A low proportion of aromatic recurring units ensures a better UV resistance.

[0057] Polyamide (PA) may have the combination of monomers as disclosed in the second column of Table II or as disclosed in claim 9 or claim 23 or claim 27. The nomenclature used in Table II or in those claims refers to the constitutive monomers of the polyamide. For instance, polyamide IPDA / TMD-BCDA / 15 refers to the polyamide prepared by the polycondensation of IPDA and TMD (diamines) and BCDA and HOOC- (CH2)i3-COOH (diacids). Likewise, IPDA.EDCA / IPDA.13 refers to the polyamide prepared by the polycondensation of IPDA (diamine) and EDCA and HOOC-(CH2)U-COOH (diacids).

[0058] The composition of polyamide (PA) is determined with well-known analytical techniques. The composition of polyamide (PA), the proportions of recurring units and end-groups in the polyamide (PA) can be determined by1H NMR spectroscopy. They can also be determined after digestion (hydrolysis) of the polyamide (PA) and analysis of the mixture resulting from said digestion. The analysis is performed by the usual analytical techniques available to the skilled person. Gas chromatography (GC) and / or liquid chromatography (LC) can conveniently be used for this analysis. High-performance liquid chromatography (HPLC) is a convenient analytical technique for this analysis. See ACS Sustainable Chem. Eng. 2020, 8, 31 , 11818-11826. The hydrolysis of the polyamide is preferably performed in acidic conditions: the sample of polyamide is mixed with a strong acid and the mixture is heated at a temperature higher than 150°C until digestion is complete. The resulting mixture is then cooled to room temperature, diluted with a solvent and the obtained mixture is analyzed by at least one analytical method. As an example of conditions of digestion, the following conditions are given: mix the weighed sample of polyamide (40-50 mg) with a strong acid (0.5 mL of HBr, 48 wt% in water) in an hydrolysis tube and after purging O2with vacuum and adding N2(cycle vacuum I N2: 3 times) heat the mixture at a temperature higher than 150°C (160°C) until digestion is complete(generally, a duration of at least 4 hours is needed). Then cool to room temperature. The mixture is diluted with a solvent (mixture acetonitrile / water with vol. ratio 2 / 1 ) and the obtained mixture is analyzed by LC-MS (Liquid Chromatography coupled with Mass Spectroscopy).

[0059] The end-groups may also be titrated by a potentiometric technique.

[0060] Several embodiments of the present invention are now disclosed below.

[0061] Embodiment (E1)

[0062] According to an embodiment (E1 ) of the present disclosure, the recurring units of the polyamide (PA) consist essentially of or consist of recurring units (RPA). The expression "consist essentially of" means in the context of the recurring units that the recurring units of polyamide (PA) consist of (RPA) and up to 1 .5 mol%, preferably up to 1 .0 mol%, preferably up to 0.5 mol% of recurring units (RPA*) other than (RPA).

[0063] Recurring units (RPA*) are typically selected in the group consisting of the units derived from a lactam (e.g. lauryl lactam), the units derived from an aminoacid (e.g. aminoundecanoic acid), the units derived from the condensation of a diamine and a dicarboxylic acid and combination thereof.

[0064] More particularly according to this embodiment (E1 ):- (RPA) is formed from the condensation of BCDA and H2N-(CH2)g-NH2; or- (RPA) is formed from the condensation of BCDA and H2N-(CH2)IO-NH2; or- (RPA) is formed from the condensation of BCDA and H2N-(CH2)n-NH2; or- (RPA) is formed from the condensation of BCDA and H2N-(CH2)i2-NH2; or- (RPA) is formed from the condensation of BCDA and IPDA; or- (RPA) is formed from the condensation of EDCA and H2N-(CH2)g-NH2; or- (RPA) is formed from the condensation of EDCA and H2N-(CH2)IO-NH2; or- (RPA) is formed from the condensation of EDCA and H2N-(CH2)n-NH2; or- (RPA) is formed from the condensation of EDCA and H2N-(CH2)i2-NH2; or- (RPA) is formed from the condensation of EDCA and IPDA.

[0065] For this embodiment (E1 ), BCDA may more particularly be f,f-BCDA.

[0066] According to an embodiment, polyamide (PA) has one of the following compositions or is selected in the group consisting of:- DA.DI;- 11. DI;- 12. DI;- IPDA.DI; where diacid DI is BCDA or EDCA or a combination of BCDA and EDCA; diamine DA has the meaning indicated herein; and 9, 10, 11 , 12 designate respectively the diamines of formula H2N-(CH2)g-NH2, H2N-(CH2)IO-NH2, H2N-(CH2)ii-NH2and H2N-(CH2)i2-NH2.

[0067] Embodiments (E2a-f)

[0068] In these embodiments (E2a-f), the expression "consist essentially of" means in the context of the recurring units that the recurring units of polyamide (PA) consist of recurring units (RPA), (RPA**) and up to 1 .5 mol%, preferably up to 1.0 mol%, preferably up to 0.5 mol% of recurring units (RPA*) other than (RPA) and (RPA**).

[0069] The diamine component (A) consists essentially of the indicated diamine(s) or consists of the indicated diamine(s). The expression "consist essentially" used here in relation to the diamine component (A) means that the diamine component (A) consist of the indicated diamine(s) and up to 1.5 mol%, preferably up to 1 .0 mol%, preferably up to 0.5 mol% of at least one diamine which is not one of the indicated diamine(s).

[0070] Likewise, the dicarboxylic acid component (B) consists essentially of the indicated dicarboxylic acid(s) or consists of the indicated dicarboxylic acid(s). The expression "consist essentially" used here in relation to the dicarboxylic acid component (B) means that the dicarboxylic acid component (B) consist of the indicated dicarboxylic acid(s) and up to 1.5 mol%, preferably up to 1 .0 mol%, preferably up to 0.5 mol% of at least one dicarboxylic acid which is not one of the indicated dicarboxylic acid(s).

[0071] According to an embodiment (E2a), the recurring units of the polyamide (PA) consist essentially of or consist of recurring units (RPA) and recurring units (RPA**) other than (RPA) which are selected in the group of (i) the recurring units (AB) derived from the condensation of a diamine and a dicarboxylic acid; (ii) from a lactam; (iii) from an aminoacid and combination thereof,where the recurring units (RPA) and recurring units (AB) are formed from the condensation of a diamine component (A) and a dicarboxylic acid component (B) wherein:■ the diamine component (A) consists essentially of or consists of diamine (DA) as defined herein and optionally a diamine NH2-A-NH2 where A is selected in the group consisting of linear or branched C4- C7 alkylene groups, phenylene group, xylylene group and combination thereof;■ the dicarboxylic acid component (B) consists essentially of or consists of dicarboxylic acid (DI) and optionally a dicarboxylic acid HOOC-B-COOH where B is selected in the group consisting of linear or branched C6-C40 alkylene groups, phenylene, cyclohexylene and combination thereof; wherein the proportion of aromatic recurring units in polyamide (PA) is lower than or equal to 10.0 mol%.

[0072] According to another embodiment (E2b), the recurring units of the polyamide (PA) consist essentially of or consist of recurring units (RPA) and recurring units (RPA**) other than (RPA) which are recurring units (AB) formed from the condensation of a diamine and a dicarboxylic acid, where the recurring units (RPA) and recurring units (AB) are formed from the condensation of a diamine component (A) and a dicarboxylic acid component (B) wherein:■ the diamine component (A) consists essentially of or consists of diamine (DA) as defined herein and optionally a diamine NH2-A-NH2 where A is selected in the group consisting of linear or branched C4- C7 alkylene groups, phenylene group, xylylene group and combination thereof;■ the dicarboxylic acid component (B) consists essentially of or consists of dicarboxylic acid (DI) and optionally a dicarboxylic acid HOOC-B-COOH where B is selected in the group consisting of linear or branched C6-C40 alkylene groups, phenylene, cyclohexylene and combination thereof; wherein the proportion of aromatic recurring units is lower than or equal to 10.0 mol%.

[0073] B is selected in the group consisting of linear or branched C6-C40 alkylene groups, phenylene, cyclohexylene and combination thereof. According to an embodiment, B is selected in the group consisting of linear or branched C6-C16 alkylene groups, phenylene, cyclohexylene and combination thereof.

[0074] According to an embodiment, dicarboxylic acid HOOC-B-COOH is selected in the group disclosed in Table II.

[0075] According to another preferred embodiment (E2c), the recurring units of the polyamide (PA) consist essentially of or consist of recurring units (RPA) and recurring units (RPA**) other than (RPA) which are recurring units (AB) formed from the condensation of a diamine and a dicarboxylic acid; where the recurring units (RPA) and recurring units (AB) are formed from the condensation of a diamine component (A) and a dicarboxylic acid component (B) wherein:■ the diamine component (A) consists essentially of or consists of diamine (DA) as defined herein and optionally a diamine NH2-A-NH2 where A is selected in the group consisting of linear or branched C4- C7 alkylene groups, phenylene group, xylylene group and combination thereof;■ the dicarboxylic acid component (B) consists essentially of or consists of dicarboxylic acid (DI) and optionally one or more dicarboxylic acids Y of formula HOOC-(CH2)y-COOH where y is an integer between 7 and 40 or between 7 and 16; wherein the proportion of aromatic recurring units is lower than or equal to 10.0 mol%.

[0076] According to another preferred embodiment (E2d), the recurring units of the polyamide (PA) consist essentially of or consist of recurring units (RPA) and recurring units (RPA**) other than (RPA) which are recurring units (AB) formed from the condensation of a diamine and a dicarboxylic acid, where the recurring units (RPA) and recurring units (AB) are formed from the condensation of a diamine component (A) and a dicarboxylic acid component (B) wherein:■ the diamine component (A) consists essentially of or consists of diamine (DA) as defined herein;■ the dicarboxylic acid component (B) consists essentially of or consists of dicarboxylic acid (DI) and one or more dicarboxylic acid Y of formula HOOC-(CH2)y-COOH where y is an integer between 7 and 40 or between 7 and 16.

[0077] According to another preferred embodiment (E2e), the recurring units of the polyamide (PA) consist essentially of or consist of recurring units (RPA) and recurring units (RPA**) other than (RPA) which are recurring units (AB) formed from the condensation of a diamine and a dicarboxylic acid component, where the recurring units (RPA) and recurring units (AB) are formed from the condensation of a diamine component (A) and a dicarboxylic acid component (B) wherein:■ the diamine component (A) consists essentially of or consists of diamine (DA) as defined herein;■ the dicarboxylic acid component (B) consists essentially of or consists of dicarboxylic acid (DI) and optionally a dicarboxylic acid HOOC-B-COOH where B is selected in the group consisting of linear or branched C6-C40 alkylene groups, cyclohexylene and combination thereof.

[0078] Further details and embodiments are now given for for embodiments (E2ae)-

[0079] Phenylene group is typically a para-phenylene group of formula:

[0080] Diamine NH2-A-NH2 is a diamine where A is a linear or branched C4-C7 alkylene group. The alkylene group is more particularly of formula -(CH2)P- p being an integer between 4 and 7. According to an embodiment of the present disclosure, this diamine is 1 ,6-hexanediamine ( / e with p=6).

[0081] The proportion of recurring units (RPA**) is typically between 1.5 mol% and 70.0 mol%, preferably between 1.5 mol% and 55.0 mol%.

[0082] The aminoacid is more particularly 11-aminoundecanoic acid. The lactam is more particularly lauryl lactam.

[0083] According to a preferred embodiment of the present disclosure, the dicarboxylic acid component (B) comprises at least one dicarboxylic acid Y of formula HOOC-(CH2)y-COOH where y is an integer between 7 and 40 or between 7 and 16.

[0084] Embodiment (E2f)

[0085] According to another preferred embodiment (E2f), polyamide (PA) comprises at least 95.0 mol%, preferably at least 98.0 mol%, preferably at least 99.0 mol% of recurring units derived from the condensation of a diamine component (A) and a dicarboxylic acid component (B) wherein:■ the diamine component (A) consists essentially of or consists of IPDA and optionally one or more diamines selected in the group consistingof aliphatic diamines of formula H2N-Alk-NH2 where Aik designates a C4-C16 linear or branched alkylene group, 1 ,3-BAC, 1 ,4-BAC and TMD and combination thereof;■ the dicarboxylic acid component (B) consists essentially of or consists of dicarboxylic acid (DI) and optionally one or more dicarboxylic acids selected in the group consisting of the dicarboxylic acids Y of formula HOOC-(CH2)y-COOH where y is an integer between 7 and 40 or between 7 and 16, 1 ,4-CHDA and combination thereof.

[0086] The diamine component (A) of embodiment (E2f) consists essentially of or consists of IPDA and optionally one or more diamines selected in the group consisting of aliphatic diamines of formula H2N-Alk-NH2 where Aik designates a C4-C16 linear or branched alkylene group, 1 ,3-BAC, 1 ,4-BAC and TMD and combination thereof. More particularly, the diamine component (A) consists essentially of or consists of IPDA and optionally one or more diamines selected in the group consisting of aliphatic diamines of formula H2N-Alk-NH2 where Aik designates a Cs-C linear or branched alkylene group, 1 ,3-BAC, 1 ,4-BAC and TMD and combination thereof. Even more particularly, the diamine component (A) consists essentially of or consists of IPDA and optionally one or more diamines selected in the group consisting of 1 ,3-BAC, 1 ,4-BAC and TMD and combination thereof.

[0087] According to embodiment (E2f), the proportion of IPDA in the diamine component (A) is preferably > 45.0 mol%, preferably > 50.0 mol%, preferably > 60.0 mol%, preferably > 65.0 mol%, preferably > 70.0 mol%, preferably > 80.0 mol%, this proportion being based on the total amount of diamines in the diamine component (A) and / or the proportion of DI in the dicarboxylic acid component (B) is preferably > 30.0 mol%, preferably > 45.0 mol%, preferably > 48.0 mol%, this proportion being based on the total amount of dicarboxylic acids in the dicarboxylic acid component (B).

[0088] According to an embodiment of the present disclosure, the dicarboxylic acid Y of formula HOOC-(CH2)y-COOH is any one of the dicarboxylic acids disclosed in Table II.

[0089] According to an embodiment of the present disclosure, y is preferably an integer greater than or equal to 11 (> 11 ) or greater than or equal to 12 (> 12).

[0090] According to an embodiment of the present disclosure, polyamide (PA) has one of the following compositions or is selected in the group consisting of:- IPDA.DI / IPDA.Y;- IPDA / BAC-DI / Y;- BAC.DI / BAC.Y;- IPDA / TMD-DI / Y;- TMD.DI / TMD.Y;- IPDA.DI / IPDA.CHDA / IPDA.Y; where:- DI is BCDA or EDCA or a combination of BCDA and EDCA;- Y designates one or more dicarboxylic acids of formula HOOC-(CH2)y- COOH where y is an integer between 7 and 40 or between 7 and 16; Y being preferably HOOC-(CH2)i4-COOH, HOOC-(CH2)i5-COOH, HOOC- (CH2)i6-COOH or HOOC-(CH2)36-COOH;- CHDA designates 1 ,4-cyclohexanedicarboxylic acid;- BAC designates 1 ,3-BAC and / or 1 ,4-BAC, BAC being preferably 1 ,3- BAC.

[0091] Polyamide (PA) may be any one of polyamide of claim 27.

[0092] Molar ratio DI / Y is preferably at least 30.0 / 70.0, preferably at least 45.0 / 55.0.

[0093] According to an embodiment, molar ratio DI / Y is:- from 45.0 / 55.0 to 95.0 / 5.0; or- from 45.0 / 55.0 to 85.0 / 15.0; or- from 65.0 / 35.0 to 85.0 / 15.0; or- from 65.0 / 35.0 to 75.0 / 25.0;- from 75.0 / 25.0 to 85.0 / 15.0.

[0094] For IPDA / BAC-DI / Y, molar ratio IPDA / BAC is preferably from 45 / 55 to 95 / 5, preferably from 45 / 55 to 85 / 15. This molar ratio may be from 60 / 15 to 85 / 15.

[0095] For IPDA / TMD-DI / Y, molar ratio IPDA / TMD is preferably from 45 / 55 to 95 / 5, preferably from 45 / 55 to 85 / 15. This molar ratio may be from 60 / 15 to 85 / 15.

[0096] For IPDA.DI / IPDA.CHDA / IPDA.Y, the proportions of the dicarboxylic acids are preferably the following: DI from 30.0 to 60.0 mol%, CHDA: from 30.0 to 60.0 mol% and Y: from 10.0 to 20.0 mol%.

[0097] According to a preferred embodiment of the present disclosure, the diamine component (A) consists of the indicated diamines and the dicarboxylic acid component (B) consists of the indicated dicarboxylic acids.

[0098] According to another preferred embodiment of the present disclosure, the recurring units of polyamide (PA) consist of recurring units (RPA) as described herein or consist of recurring units (RPA) and (RPA**) as decribed herein.

[0099] Glass transition temperature (Tg)

[0100] Polyamide (PA) exhibits a Tg of at least 100.0°C as determined by Differential Scanning Calorimetry (DSC) according to ASTM D3418, notably with a heating and cooling rate of 20°C / min.

[0101] Tg is preferably at least 120.0°C, preferably at least 130.0°C, preferably at least 140.0°C, preferably at least 150.0°C, preferably at least 160.0°C, preferably at least 165.0°C.

[0102] Tg is preferably at most 200.0°C to ease the melt processing of the polyamide.

[0103] Tg is typically between 100.0 and 250.0°C. Tg is preferably between 100.0°C and 200.0°C.

[0104] Tg is more particularly measured according to the method provided in the Experimental Section.

[0105] Amorphous or semi-crystalline polyamide

[0106] Polyamide (PA) may be amorphous or semi-crystalline.

[0107] According to an embodiment, polyamide (PA) is a semi-crystalline polyamide, exhibiting a heat of fusion (Hm) greater than or equal to 6.0 J / g.

[0108] Polyamide (PA) is preferably a semi-crystalline polyamide exhibiting a heat of fusion (Hm) greater than or equal to 30.0 J / g (> 30.0 J / g). Hm is preferably at least 50.0 J / g. Hm may more particularly be between 30.0 and 100.0 J / g.According to this embodiment, polyamide (PA) may exhibit a melting temperature (Tm) as determined according to ASTM D3418 of at least 180.0°C. Tm is preferably at least 200.0°C. Hm may be at least 350°C. Tm is generally at most 370.0°C.

[0109] Hm and Tm are measured by DSC according to ASTM D3418, with a heating and cooling rate of 20°C / min, more particularly with the method provided in the Experimental Section.

[0110] C / N ratio

[0111] Polyamide (PA) preferably exhibits an average (C / N) ratio (noted (C / N)av) of at least 10.0. (C / N)avis calculated by taking into account the (C / N) molar ratio of the amide recurring units of the polyamide (PA):where:■ pi and (C / N )i are respectively the proportion in mol% and (C / N) molar ratio of recurring unit number i of generic formula -C(=O)-G-NH- where G is a divalent radical consisting of C and H atoms or of C, H, N and O atoms;■ (C / N )i = number of C atoms in said recurring unit number i I number of N atoms in said recurring unit number i.

[0112] For instance, for the copolyamide E6 having 70 mol% of IPDA.BCDA and 30 mol% of IPDA.16:- (C / N) ratio of IPDA.BCDA = (10+14) / 2 = 12;- (C / N) ratio of IPDA.16 = (10+16) / 2 = 13;- (C / N)avof polyamide (PA) = 70% x 12 + 30% x 13 = 12.3.

[0113] (C / N)avis obtained by increasing the proportion of units (RPA) and / or by increasing the proportion of monomers having a high (C / N) ratio, such as the dicarboxylic acids of formula HOOC-(CH2)y-COOH where y is an integer > 7, notably between 7 and 40, more particularly between 7 and 16.

[0114] (C / N)avis at least 10.0. (C / N)avis preferably greater than or equal to 11.0. (C / N)avis typically between 10.0 and 18.0.

[0115] (C / N)avis easily determined experimentally by elemental analysis.

[0116] Molecular weights and inherent viscosity

[0117] Polyamide (PA) typically has a number average molecular weight ("Mn") ranging from 5,000 g / mol to 40,000 g / mol. Mnmay more particularly be from 5,000 g / mol to 30,000 g / mol.

[0118] Polyamide (PA) typically exhibits a weight average molecular weight ("Mw") of at least 8,000 g / mol, preferably at least 10,000 g / mol, preferably at least 20,000 g / mol. Mwis generally at most 50,000 g / mol. _Mw may range from 8,000 g / mol to 100,000 g / mol. Mwmay more particularly be from 10,000 g / mol to 30,000 g / mol.

[0119] Mnand Mware determined by Size Exclusion Chromatography (SEC) according to the conditions provided in the Experimental Section.

[0120] Polyamide (PA) may also exhibit a number average molecular weight ("Mn*") ranging from 5,000 g / mol to 40,000 g / mol. Mn* may more particularly be from 5,000 g / mol to 30,000 g / mol. Mn* is determined using the following equation (1 ): Mn* = 2,000,000 I [EG] (1 ) wherein [EG] is the proportion of end-groups in the PA expressed in mmol / kg. The proportion of end groups are generally quantified by1H NMR spectroscopy or by potentiometric techniques.

[0121] Inherent viscosity (IV) of polyamide (PA) is preferably at least 0.30 dL / g, preferably at least 0.40 dL / g, preferably at least 0.50 dL / g. IV is typically between 0.30 and 1 .70 dL / g. IV is measured according to ASTM D5225 with the use of a mixture phenol / 1 ,1 ,2,2-tetrachloroethane (60 / 40 wt. ratio).

[0122] End groups of polyamide (PA)

[0123] The end-groups of the polyamide (PA) are selected in the group of -NH2, - COOH and amide end-groups. Indeed, the end-groups in the polyamide (PA) may be -NH2 or -COOH. Yet, when the polycondensation (as disclosed below) involves the addition of an end-capping agent selected in the group of monocarboxylic acids, primary amines and combination thereof, these end-groups may be converted, partially or totally, into amide end-groups.

[0124] The amide end groups are of formula -NH-C(=O)-R where R is an alkyl group, an aryl group or a cycloalkyl group and / or of formula -C(=O)-NH-R' where R' is an alkyl group or a cycloalkyl group. R is more particularly a linear or branched C1-C18 alkyl group or a C5-C10 cycloalkyl group. R' is more particularly a linear or branched C2-C18 alkyl group.

[0125] The amide end groups of formula -NH-C(=O)-R result from the reaction of the end-groups -NH2 with a monocarboxylic acid (end-capping agent) of formula R-COOH.

[0126] The monocarboxylic acid (end-capping agent) may advantageously be selected in the group consisting of benzoic acid; cyclohexanoic acid; R- COOH where R is a linear or branched C1-C18 alkyl group and combination of two or more of these acids. R is the radical derived from the acid of formula R-COOH.

[0127] The monocarboxylic acid (end-capping agent) may more particularly be selected in the group consisting of acetic acid, propanoic acid, butyric acid, valeric acid, caproic acid, lauric acid, stearic acid, 2-ethylhexanoic acid, cyclohexanoic acid, benzoic acid and combination of two or more of these acids.

[0128] The monocarboxylic acid (end-capping agent) is more particularly of formula CH3-(CH2)n-COOH where n is an integer between 0 and 17. The amide end groups are then of formula -NH-C(=O)-(CH2)n-CH3.

[0129] The amide end groups of formula -C(=O)-NH-R' result from the reaction of the end-groups -COOH with a primary amine (end-capping agent) of formula R'-NH2.

[0130] The primary amine (end-capping agent) may advantageously be selected in the group consisting of the amines of formula R'-NH2 where R' is a linear or branched C2-C18 alkyl group. R' is the radical derived from the amine of formula R'-NH2.

[0131] The primary amine (end-capping agent) is more particularly of formula CH3- (CH2)n-NH2 where n' is an integer between 1 and 17. The amide end groups are then of formula -C(=O)-NH-(CH2)n-CH3.

[0132] The primary amine (end capping agent) may more particularly be selected in the group consisting of propyl amine, butylamine, pentylamine, hexylamine, 2-ethylhexylamine, n-octylamine, n-dodecylamine, n- tetradecylamine, n-hexadecylamine, stearylamine, cyclohexylamine and combination of two or more of these amines.

[0133] Preparation of polyamide (PA)

[0134] Polyamide (PA) is prepared by polycondensation.

[0135] Polyamide (PA) is prepared by polycondensation by heating a reaction mixture (RM) comprising, consisting essentially of or consisting of:- a mixture of monomers (MM) consisting essentially of or consisting of all the monomers constituting the polyamide (PA);- optionally a catalyst, notably selected in the group consisting of phosphorous acid, ortho-phosphoric acid, meta-phosphoric acid, alkali- metal hypophosphite such as sodium hypophosphite and phenylphosphinic acid;- optionally at least one capping agent;- optionally water in a proportion which is preferably less than 80.0 wt.%, preferably less than 50.0 wt.% water, this proportion of water being based on the total weight of the reaction mixture (RM).

[0136] As is well known in polycondensation, the reaction mixture (RM) comprises all the monomers in a quantity such that the proportion of -COOH groups from the dicarboxylic acids and the amino-acid(s) (if any) and the proportion of -NH2 groups from the diamines and the amino-acid(s) (if any) are substantially equimolar. This molar ratio [-COOH] I [-NH2] is typically comprised between 0.9 and 1.1 , preferentially between 0.95 and 1 .05, even more preferentially between 0.98 and 1.02.

[0137] The reaction mixture (RM) generally comprises a catalyst. The catalyst may be selected in the group consisting of phosphorous acid, ortho-phosphoric acid, meta-phosphoric acid, alkali-metal hypophosphite such as sodium hypophosphite and phenylphosphinic acid. A convenient catalyst used is phosphorous acid.

[0138] For control of the molar mass, the reaction mixture (RM) may also further comprise at least one end-capping agent as disclosed above.

[0139] The temperature at which the reaction mixture is heated must be high enough to induce the reaction between the amine groups and the carboxylic groups and to decrease the viscosity of the mixture. This temperature is generally at least 140°C, more particularly at least 200°C. The polycondensation results in the formation of the amide bonds and the release of water as a by-product.

[0140] The temperature can be step-wise increased in the course of the polycondensation. An example of step-wise increase is given in example E4 and may be followed for the preparation of the polyamide of the invention.

[0141] The polycondensation is advantageously performed in a well stirred vessel equipped with means to remove the volatile products of the reaction. As the viscosity of the reaction mixture increases over time, the stirrer is adapted to provide sufficient stirring to the reaction mixture at the beginning of the polymerization and when the conversion of the polycondensation is nearly complete.

[0142] Any one of the conditions disclosed in the Experimental Section may conveniently be used for the preparation of the polyamide (PA).

[0143] Polymer composition (C)

[0144] As a second aspect, the invention also relates to a polymer composition (C) comprising:- at least one polyamide (PA) as disclosed herein;- optionally at least one filler (F);- at least one polymer additive which is not a filler, notably selected in the group consisting of heat stabilizers, UV stabilizers, colorants, antistatic agents, nucleators and combination of two or more of said additives;- optionally at least one polyamide other than polyamide (PA).

[0145] The proportion of polyamide (PA) in polymer composition (C) is preferably at least 30.0 wt%, this proportion being based on the total weight of polymer composition (C). This proportion is generally from 30.0 wt% to 100.0 wt% or from 30.0 to 90.0 wt% or from 50.0 to 90.0 wt%.

[0146] The polymer(s), the fillers (if any) and the polymer additive(s) of the polymer composition (C) are typically blended.

[0147] The proportion of the polymer additive(s) in the polymer composition (C) may be between 0 and 10.0 wt%, this proportion being based on the total weight of the polymer composition (C). This proportion is generally between 0.5 and 10.0 wt%.

[0148] The polymer composition (C) may also comprise a polyamide different from polyamide (PA).

[0149] The polymer composition (C) preferably exhibits the mechanical properties as mentioned above. Likewise, the polymer composition (C) preferably exhibits the optical properties as mentioned above.

[0150] The polymer composition (C) is prepared by a compounding method comprising a step in which the polymer(s) is / are melted and mixed with the other components of the polymer composition (C). Any equipment generally used for compounding may be used a melt mixer, such as a single screw extruder or a twin screw extruder; a single screw or twin screw kneader or a Banbury mixer. The compounding method may conveniently be performed with an extruder such as a single screw extruder or a twin screw extruder.

[0151] Uses of polyamide (PA) and polymer composition (C)

[0152] Polyamide (PA) or polymer composition (C) may be used for the preparation of articles, notably transparent or translucent articles, and notably transparent or translucent articles of the daily life.

[0153] The article may notably be a container or any one of the articles defined herein.

[0154] These articles are typically prepared from polyamide (PA) or polymer composition (C) by injection moulding.

[0155] The polyamide (PA) and the polymer composition (C) may be used for the preparation of decorative articles (in particular in the automobile interior); sport articles (in particular ski boots, midsoles for sport shoes); toys; household articles (in particular containers, dishes, bowls, tins, beakers, baby bottles, drinking bottles, components of kitchen appliances); components of spectacles (in particular spectacle frames or spectacle sidepieces, safety goggles); medical objects (in particular containers, syringes); parts of smart phones (in particular protective covers).

[0156] Hot-steam sterilizable articles for the medical field such as medical tools, catheters, instruments, apparatus housings, connectors, valves, inhalers, tubes, containers, flexible or rigid lines in medical apparatus for breathing air and / or bodily fluids.

[0157] Numerous device components which come into contact with hot steam are conceivable such as spray nozzles for water steam in coffee machines, household appliances, steam cookers and steam cleaners, kitchendishware and covers, particularly for use in microwave devices, pan lids, hair curlers, combs, drying hoods or pipes.[Experimental section]

[0158] Products usedTable 1

[0159] Thermal properties (To, Tm, Hm)

[0160] Thermal properties of the polymers were evaluated by differential scanning calorimetry (DSC) measurement according to ASTM D3418.

[0161] Amorphous samples were analyzed between 0°C and 350°C, with a heating and a cooling rate of 20°C / min. Semi-crystalline samples were analyzed between 0°C and 380°C, with a heating and a cooling rate of 20°C / min.

[0162] Tg, Tm and Hm are measured from the 2ndheat ramp.

[0163] SEC

[0164] The molecular weights Mn and Mw are measured by Size Exclusion Chromatography (SEC) (PMMA standards; detector: refractive index detector).

[0165] Preparation of semi-crystalline polyamide (E1 )

[0166] 5.000 g (19.66 mmol) of BCDA, 3.455 g (20.05 mmol) of C10 diamine, 0.003 g (0.04 mmol) of phosphorous acid, and 4.165 g of water were charged to a glass test tube and placed inside of a stainless-steel autoclave reactor. The reactor is sealed, assembled into the reaction apparatus and then purged with nitrogen gas 3 times with a final positive pressure of ~ 10 psi. At this time the internal temperature is increased gradually to 285°C over a period of roughly 3.5 hours. Consequently, the internal pressure increases with temperature to a maximum of 275-300 psi. After 3.5 hours, the pressure (steam / nitrogen gas) is gradually released through a distillation path to remove the water. The final step reaches a maximum temperature of 320°C with flowing nitrogen gas through the reactor for 30 mins to remove residual moisture and finish polymerization. Following the final step, the autoclave was allowed to cool to room temperature, then the test tube with polymer were removed and the sample retrieved. This polymerization yielded an opaque semi-crystalline polymer plug.

[0167] Preparation of amorphous polyamide (E4)

[0168] 2.500 g (9.83 mmol) of t,t-BCDA, 2.815 g (9.83 mmol) of C16 diacid, 3.448 g (20.25 mmol) of IPDA, (0.04 mmol) of phosphorous acid, and 4.316 g of DI water were charged to a glass test tube and placed inside of a stainless- steel autoclave reactor. The reactor is sealed, assembled into the reaction apparatus, and then purged with nitrogen gas 3 times with a final positive pressure of ~10 psi. At this time the internal temperature is increased gradually to 285°C over a period of roughly 3.5 hours. Consequently, the internal pressure increases with temperature to a maximum of 275-300 psi. After 3.5 hours, the pressure (steam / nitrogen gas) is gradually released through a distillation path to remove the water. The final step reaches a maximum temperature of 320°C with flowing nitrogen gas through the reactor for 30 mins to remove residual moisture and finish polymerization. Following the final step, the autoclave was allowed to cool to room temperature, then the test tube with polymer were removed and the sampleretrieved. This polymerization yielded a transparent amorphous polymer plug.

[0169] Preparation of amorphous polyamide (E5)

[0170] 1.142g (4.5mmol) of BCDA, 0.497g (1.9mmol) of C14 diacid and 1.09g (6.4mmol) of IPDA were introduced in a glass tube. The glass tube is place under a nitrogen gas stream, inserted into a metallic heating block and the temperature was gradually raised up to 320°C over 60 min. Upon reaching 320°C, the reaction mixture is kept for an additional 30 min at 320°C, then the glass tube is removed from the heating block and allowed to cool down to about 20°C.

[0171] Preparation of amorphous polyamide (E8)

[0172] 109.7g (389mmol) of EDCA, 25.1g (96mmol) of C14 diacid, 83.5g (491 mmol) of IPDA, 1.06g (0.65mmol) of a dilute aqueous solution of phosphorous acid were charged in a stainless-steel autoclave reactor equipped with a double helical ribbon mechanical stirrer (20rpm). The autoclave was purged with nitrogen gas, then sealed and the temperature in the reactor was gradually increased up to 290°C, while the pressure was regulated to 11 bars. Upon reaching 290°C, the pressure was gradually reduced to 1 bar while the temperature was further increased up to 300°C. The pressure was then further reduced down to about 400 mbar and the reaction mixture was kept 10 min at 300°C / 400 mbars. The pressure was returned to 1 bar through nitrogen gas and the polymer was discharged as a strand and pelletized.

[0173] 1 psi = 0.0689475729 bar

[0174] As can be seen below, the polyamide of the invention exhibits a high Tg and a low water uptake (see the high C / N ratio). Moreover, the polyamide of the invention is typically amorphous. This combination of properties renders them suitable for the uses indicated herein.able IIE1: Grilamid TR55; CE2: Grilamid TR60; CE3: Grilamid TR90; CE4: Trogamid CX7323 : refers to comparative examples; E; refers to examples according to the invention : means amorphousable II (continued)

Claims

ClaimsClaim 1. Polyamide (PA) exhibiting a glass transition temperature (Tg) of at least 100.0°C, Tg being determined by Differential Scanning Calorimetry (DSC) according to ASTM D3418, notably with a heating and cooling rate of 20°C / min, and comprising recurring units (RPA) of formula:where:■ X is o a bond; or o - (CRaRb)x- where x is 2 and Raand Rb are independently selected in the group of H and (Ci-C2)-alkyl group;■ Ri designates the divalent radical derived from at least one Cs-C diamine (DA) selected in the group of (i) aliphatic diamines of formula H2N-Alk-NH2 where Aik designates a linear or branched alkylene group, (ii) diamines containing one or two cyclohexane rings and (iii) combination thereof; where the proportion of recurring units (RPA) in polyamide (PA) is at least 30.0 mol%, preferably at least 45.0 mol%, this proportion being based on the total amount of recurring units in polyamide (PA).Claim 2. Polyamide (PA) according to claim 1 , wherein:- the aliphatic diamines (i) are selected in the group consisting of H2N- (CH2)8-NH2, H2N-(CH2)9-NH2, H2N-(CH2)IO-NH2, H2N-(CH2)i2-NH2, 2,2,4-trimethyl-1 ,6-hexanediamine (2,2,4-TMD), 2,4,4-trimethyl-1 ,6- hexanediamine (2,4,4-TMD) and combination thereof; and / or the diamines containing one or two cyclohexane rings (ii) are selected in the group consisting of IPDA (isophorone diamine), 1 ,3-BAC (1 ,3- bis(aminomethyl)cyclohexane), 1 ,4-BAC (1 ,4- bis(aminomethyl)cyclohexane), having respective formula:thereof.Claim 3. Polyamide (PA) according to claim 1 or 2, wherein diamine (DA) is selected in the group consisting of H2N-(CH2)8-NH2, H2N-(CH2)9-NH2, H2N-(CH2)IO-NH2, H2N- (CH2)I2-NH2, 2,2,4-trimethyl-1 ,6-hexanediamine (2,2,4-TMD), 2,4,4-trimethyl-1 ,6- hexanediamine (2,4,4-TMD), IPDA (isophorone diamine), 1 ,3-BAC (1 ,3- bis(aminomethyl)cyclohexane), 1 ,4-BAC (1 ,4-bis(aminomethyl)cyclohexane), having respective formula:thereof.Claim 4. Polyamide (PA) according to claim 1 -3, wherein diamine (DA) is a combination of diamines selected in diamines (i) and / or diamines (ii).Claim 5. Polyamide (PA) according to any one of claims 1 -4, wherein X is a bond or -(CH2CH2)-.Claim 6. Polyamide according to any one of the preceding claims, wherein the recurring units of polyamide (PA) consist essentially of or consist of recurring units (RPA), the expression "consist essentially" meaning that the recurring units of polyamide (PA) consist of (RPA) and up to 1.5 mol%, preferably up to 1.0 mol%, preferably up to 0.5 mol% of recurring units (RPA*) other than (RPA), this proportion being based on the total amount of recurring units in polyamide (PA).Claim 7. Polyamide according to any one of the preceding claims, wherein the recurring units of polyamide (PA) consist of recurring units (RPA).Claim 8. Polyamide according to claim 1 or claim 6 or claim 7, wherein- (RPA) is formed from the condensation of BCDA and H2N-(CH2)g-NH2; or- (RPA) is formed from the condensation of BCDA and H2N-(CH2)IO-NH2; or- (RPA) is formed from the condensation of BCDA and H2N-(CH2)n-NH2; or- (RPA) is formed from the condensation of BCDA and H2N-(CH2)i2-NH2; or- (RPA) is formed from the condensation of BCDA and IPDA; or- (RPA) is formed from the condensation of EDCA and H2N-(CH2)g-NH2; or- (RPA) is formed from the condensation of EDCA and H2N-(CH2)IO-NH2; or- (RPA) is formed from the condensation of EDCA and H2N-(CH2)n-NH2; or- (RPA) is formed from the condensation of EDCA and H2N-(CH2)i2-NH2; or- (RPA) is formed from the condensation of EDCA and IPDA; where BCDA and EDCA designate respectively the dicarboxylic acids of formula:Claim 9. Polyamide, notably according to any one of claims 1 -8, wherein polyamide (PA) has one of the following compositions or is selected in the group consisting of:- DA.DI;- 9.DI;- 10. DI;- 11. DI;- 12. DI;- IPDA.DI; where diacid DI is BCDA or EDCA or a combination of BCDA and EDCA; diamine DA has the meaning indicated in claim 1 or 2 or 3; and 9, 10, 11 , 12 designate respectively the diamines of formula H2N-(CH2)g-NH2, H2N-(CH2)IO-NH2, H2N- (CH2)u-NH2and H2N-(CH2)i2-NH2.Claim 10. Polyamide according to any one of claims 1 -5, wherein the recurring units of the polyamide (PA) consist essentially of or consist of:- recurring units (RPA); and- recurring units (RPA**) other than (RPA) selected in the group of (i) the recurring units (AB) formed from the condensation of a diamine and adicarboxylic acid; (ii) from a lactam; (iii) from an aminoacid and combination thereof; where the recurring units (RPA) and recurring units (AB) are formed from the condensation of a diamine component (A) and a dicarboxylic acid component (B) wherein:■ the diamine component (A) consists essentially of or consists of diamine (DA) as defined herein and optionally a diamine NH2-A-NH2 where A is selected in the group consisting of linear or branched C4- C7 alkylene groups, phenylene group, xylylene group and combination thereof;■ the dicarboxylic acid component (B) consists essentially of or consists of dicarboxylic acid (DI) of formulaoptionally a dicarboxylic acid HOOC-B-COOH where B is selected in the group consisting of linear or branched C6-C40 alkylene groups, phenylene and cyclohexylene and combination thereof; wherein the proportion of aromatic recurring units is lower than or equal to 10.0 mol%; where the expression "consist essentially of" means in relation to the recurring units that the recurring units of polyamide (PA) consist of recurring units (RPA), (RPA**) and up to 1 .5 mol%, preferably up to 1 .0 mol%, preferably up to 0.5 mol% of recurring units (RPA*) other than (RPA) and (RPA**), this proportion being based on the total amount of recurring units in polyamide (PA).Claim 11 . Polyamide (PA) according to any one of claims 1 -5, wherein the recurring units of polyamide (PA) consist essentially of or consist of:- recurring units (RPA); and- recurring units (RPA**) other than (RPA) which are recurring units (AB) formed from the condensation of a diamine and a dicarboxylic acid; where the recurring units (RPA) and recurring units (AB) are formed from the condensation of a diamine component (A) and a dicarboxylic acid component (B) wherein:■ the diamine component (A) consists essentially of or consists of diamine (DA) and optionally a diamine NH2-A-NH2 where A is selected in the group consisting of linear or branched C4-C7 alkylene groups, phenylene group, xylylene group and combination thereof;■ the dicarboxylic acid component (B) consists essentially of or consists of dicarboxylic acid (DI) of formulaoptionally a dicarboxylic acid HOOC-B-COOH where B is selected in the group consisting of linear or branched C6-C40 alkylene groups, phenylene, cyclohexylene and combination thereof; wherein the proportion of aromatic recurring units is lower than or equal to 10.0 mol%; where the expression "consist essentially of" means in relation to the recurring units that the recurring units of polyamide (PA) consist of recurring units (RPA), (RPA**) and up to 1 .5 mol%, preferably up to 1 .0 mol%, preferably up to 0.5 mol% of recurring units (RPA*) other than (RPA) and (RPA**), this proportion being based on the total amount of recurring units in polyamide (PA).Claim 12. Polyamide (PA) according to any one of claims 1 -5, wherein the recurring units of polyamide (PA) consist essentially of or consist of:- recurring units (RPA); and- recurring units (RPA**) other than (RPA) which are recurring units (AB) formed from the condensation of a diamine and a dicarboxylic acid; where the recurring units (RPA) and recurring units (AB) are formed from the condensation of a diamine component (A) and a dicarboxylic acid component (B) wherein:■ the diamine component (A) consists essentially of or consists of diamine (DA) and optionally a diamine NH2-A-NH2 where A is selected in the group consisting of linear or branched C4-C7 alkylene groups, phenylene group, xylylene group and combination thereof;■ the dicarboxylic acid component (B) consists essentially of or consists of dicarboxylic acid (DI) of formulaand optionally one or more dicarboxylic acids Y of formula HOOC-(CH2)y-COOH where y is an integer between 7 and 40 or between 7 and 16; wherein the proportion of aromatic recurring units is lower than or equal to 10.0 mol%; where the expression "consist essentially of" means in relation to the recurring units that the recurring units of polyamide (PA) consist of recurring units (RPA), (RPA**) and up to 1 .5 mol%, preferably up to 1 .0 mol%, preferably up to 0.5 mol% of recurring units (RPA*) other than (RPA) and (RPA**), this proportion being based on the total amount of recurring units in polyamide (PA).Claim 13. Polyamide (PA) according to any one of claims 1 -5, wherein the recurring units of polyamide (PA) consist essentially of or consist of:- recurring units (RPA); and- recurring units (RPA**) other than (RPA) which are recurring units (AB) formed from the condensation of a diamine and a dicarboxylic acid; where the recurring units (RPA) and recurring units (AB) are formed from the condensation of a diamine component (A) and a dicarboxylic acid component (B) wherein:■ the diamine component (A) consists essentially of or consists of diamine (DA);■ the dicarboxylic acid component (B) consists essentially of or consists of dicarboxylic acid (DI) of formulaone or more dicarboxylic acids Y of formula HOOC-(CH2)y-COOH where y is an integer between 7 and 40 or between 7 and 16; where the expression "consist essentially of" means in relation to the recurring units that the recurring units of polyamide (PA) consist of recurring units (RPA), (RPA**) and up to 1 .5 mol%, preferably up to 1 .0 mol%, preferably up to 0.5 mol% of recurring units (RPA*) other than (RPA) and (RPA**), this proportion being based on the total amount of recurring units in polyamide (PA).Claim 14. Polyamide (PA) according to any one of claims 1 -5, wherein the recurring units of the polyamide (PA) consist essentially of or consist of:- recurring units (RPA);- and recurring units (RPA**) other than (RPA) which are recurring units (AB) formed from the condensation of a diamine and a dicarboxylic acid; wherein:■ the diamine component (A) consists essentially of or consists of diamine (DA);■ the dicarboxylic acid component (B) consists essentially of or consists of dicarboxylic acid (DI) and one or more dicarboxylic acids Y of formula HOOC-(CH2)y-COOH where y is an integer between 7 and 40 or between 7 and 16; where the expression "consist essentially of" means in relation to the recurring units that the recurring units of polyamide (PA) consist of recurring units (RPA), (RPA**) and up to 1 .5 mol%, preferably up to 1 .0 mol%, preferably up to 0.5 mol% of recurring units (RPA*) other than (RPA) and (RPA**), this proportion being based on the total amount of recurring units in polyamide (PA).Claim 15. Polyamide (PA) according to any one of claims 1 -5, wherein the recurring units of the polyamide (PA) consist essentially of or consist of:- recurring units (RPA); and- recurring units (RPA**) other than (RPA) which are recurring units (AB) formed from the condensation of a diamine and a dicarboxylic acid, where the recurring units (RPA) and recurring units (AB) are formed from the condensation of a diamine component (A) and a dicarboxylic acid component (B) wherein:■ the diamine component (A) consists essentially of or consists of diamine (DA);■ the dicarboxylic acid component (B) consists essentially of or consists of dicarboxylic acid (DI) and optionally a dicarboxylic acid HOOC-B-COOH where B is selected in the group consisting of linear or branched C6-C40 alkylene groups, cyclohexylene and combination thereof;where the expression "consist essentially of" means in relation to the recurring units that the recurring units of polyamide (PA) consist of recurring units (RPA), (RPA**) and up to 1 .5 mol%, preferably up to 1 .0 mol%, preferably up to 0.5 mol% of recurring units (RPA*) other than (RPA) and (RPA**), this proportion being based on the total amount of recurring units in polyamide (PA).Claim 16. Polyamide (PA) according to any one of claims 9-15, wherein the proportion of recurring units (RPA**) in polyamide (PA) is between 1 .5 mol% and 70.0 mol%, preferably between 1.5 mol% and 55.0 mol%.Claim 17. Polyamide (PA) according to any one of claims 9-16, wherein the recurring units of polyamide (PA) consist of recurring units (RPA) and (RPA**).Claim 18. Polyamide (PA) according to any one of claims 9-17, wherein the dicarboxylic acid component (B) comprises at least one dicarboxylic acid Y of formula HOOC-(CH2)y-COOH where y is an integer between 7 and 40 or between 7 and 16 and preferably y > 11 or 12.Claim 19. Polyamide (PA) according to any one of claims 1 -5, wherein polyamide (PA) comprises at least 95.0 mol%, preferably at least 98.0 mol%, preferably at least 99.0 mol% of recurring units derived from the condensation of a diamine component (A) and a dicarboxylic acid component (B) wherein:■ the diamine component (A) consists essentially of or consists of IPDA and optionally one or more diamines selected in the group consisting of aliphatic diamines of formula H2N-Alk-NH2 where Aik designates a C4-C16 linear or branched alkylene group, 1 ,3-BAC, 1 ,4-BAC and TMD and combination thereof;■ the dicarboxylic acid component (B) consists essentially of or consists of dicarboxylic acid (DI) and optionally one or more dicarboxylic acids selected in the group consisting of the dicarboxylic acids Y of formula HOOC-(CH2)y-COOH where y is an integer between 7 and 40 or between 7 and 16, 1 ,4-CHDA and combination thereof.Claim 20. Polyamide (PA) according to claim 19, wherein:- the diamine component (A) consists essentially of or consists of IPDA and optionally one or more diamines selected in the group consisting of aliphatic diamines of formula H2N-Alk-NH2 where Aik designates a Cs- C linear or branched alkylene group, 1 ,3-BAC, 1 ,4-BAC and TMD and combination thereof or the diamine component (A) consists essentially of or consists of IPDA and optionally one or more diamines selected in the group consisting of 1 ,3-BAC, 1 ,4-BAC and TMD and combination thereof; and / or- the dicarboxylic acid component (B) consists essentially of or consists of dicarboxylic acid (DI) and optionally one or more dicarboxylic acids selected in the group of the dicarboxylic acids Y of formula HOOC- (CH2)y-COOH where y is an integer between 7 and 40 or between 7 and 16.Claim 21. Polyamide (PA) according to claim 19 or 20, wherein the proportion of IPDA in the diamine component (A) is preferably > 45.0 mol%, preferably > 50.0 mol%, preferably > 60.0 mol%, preferably > 65.0 mol%, preferably > 70.0 mol%, preferably > 80.0 mol%, this proportion being based on the total amount of diamines in the diamine component (A) and / or the proportion of DI in the dicarboxylic acid component (B) is preferably > 30.0 mol%, preferably > 45.0 mol%, preferably > 48.0 mol%, this proportion being based on the total amount of dicarboxylic acids in the dicarboxylic acid component (B).Claim 22. Polyamide (PA) according to any one of claims 12-21 , wherein y is an integer > 11 or > 12.Claim 23. Polyamide (PA), notably according to any one of the preceding claims, wherein polyamide (PA) has one of the following compositions or is selected in the group consisting of:IPDA.DI / IPDA.Y;IPDA / BAC-DI / Y;BAC.DI / BAC.Y;- IPDA / TMD-DI / Y;- TMD.DI / TMD.Y;- IPDA.DI / IPDA.CHDA / IPDA.Y; where:- DI is BCDA or EDCA or a combination of BCDA and EDCA;- Y designates one or more dicarboxylic acids of formula HOOC-(CH2)y- COOH where y is an integer from 7 to 40 or from 7 to 16 or from 11 to 16; Y being preferably HOOC-(CH2)i4-COOH, HOOC-(CH2)i5-COOH, HOOC-(CH2)i6-COOH or HOOC-(CH2)36-COOH;- CHDA designates 1 ,4-cyclohexanedicarboxylic acid;- BAC designates 1 ,3-BAC and / or 1 ,4-BAC, BAC being preferably 1 ,3- BAC.Claim 24. Polyamide (PA) according to claim 23, molar ratio DI / Y is at least 30.0 / 70.0, preferably at least 45.0 / 55.0, preferably at least 48.0 / 42.0.Claim 25. Polyamide (PA) according to claim 23 or 24, wherein molar ratio DI / Y is- from 45.0 / 55.0 to 95.0 / 5.0; or- from 45.0 / 55.0 to 85.0 / 15.0; or- from 65.0 / 35.0 to 85.0 / 15.0; or- from 65.0 / 35.0 to 75.0 / 25.0;- from 75.0 / 25.0 to 85.0 / 15.0.Claim 26. Polyamide (PA) according to any one of claims 23-25, wherein:- for IPDA / BAC-DI / Y, molar ratio IPDA / BAC is from 45 / 55 to 95 / 5, preferably from 45 / 55 to 85 / 15;- for IPDA / TMD-DI / Y, molar ratio IPDA / TMD is from 45 / 55 to 95 / 5, preferably from 45 / 55 to 85 / 15;- for IPDA.DI / IPDA.CHDA / IPDA.Y, the proportions of the dicarboxylic acids are the following: DI from 30.0 to 60.0 mol%, CHDA: from 30.0 to 60.0 mol% and Y: from 10.0 to 20.0 mol%.Claim 27. Polyamide (PA), notably according to any one of the preceding claims, selected in the group consisting of or being any one of the following:- 9.BCDA; 10.BCDA; 11. BCDA; 12.BCDA;- 9.EDCA; 10.EDCA; 11. EDCA; 12.EDCA;- IPDA.EDCA; IPDA.BCDA;- IPDA.BCDA / IPDA.13; IPDA.EDCA / IPDA.13; IPDA.BCDA / IPDA.14;IPDA.EDCA / IPDA.14, IPDA.BCDA / IPDA.15; IPDA.EDCA / IPDA.15;IPDA.BCDA / IPDA.16; IPDA.EDCA / IPDA.16; IPDA.BCDA / IPDA.18;IPDA.EDCA / IPDA.18; IPDA.BCDA / IPDA.36; IPDA.EDCA / IPDA.36;IPDA / BAC-BCDA / 13; IPDA / BAC-EDCA / 13; IPDA / BAC-BCDA / 14IPDA / BAC-EDCA / 14; IPDA / BAC-BCDA / 15; IPDA / BAC-EDCA / 15IPDA / BAC-BCDA / 16; IPDA / BAC-EDCA / 16; IPDA / BAC-BCDA / 18IPDA / BAC-EDCA / 18; IPDA / BAC-BCDA / 36; IPDA / BAC-EDCA / 36;BAC.BCDA / BAC.13; BAC.EDCA / BAC.13; BAC.BCDA / BAC.14BAC.EDCA / BAC.14; BAC.BCDA / BAC.15; BAC.EDCA / BAC.15BAC.BCDA / BAC.16; BAC.EDCA / BAC.16; BAC.BCDA / BAC.18BAC.EDCA / BAC.18; BAC.BCDA / BAC.36; BAC.EDCA / BAC.36;IPDA / TMD-BCDA / 13; IPDA / TMD-EDCA / 13; IPDA / TMD-BCDA / 14IPDA / TMD-EDCA / 14; IPDA / TMD-BCDA / 15; IPDA / TMD-EDCA / 15IPDA / TMD-BCDA / 16; IPDA / TMD-EDCA / 16; IPDA / TMD-BCDA / 18IPDA / TMD-EDCA / 18; IPDA / TMD-BCDA / 36; IPDA / TMD-EDCA / 36;TMD.BCDA / TMD.13; TMD.EDCA / TMD.13; TMD.BCDA / TMDA.14; TMDEDCA / TMD.14; TMD.BCDA / TMD.15; TMD.EDCA / TMD.15TMD.BCDA / TMD.16; TMD.EDCA / / TMD.16; TMD.BCDA / TMD.18TMD.EDCA / TMD.18: TMD.BCDA / TMD.36: TMD.EDCA / TMD.36:- IPDA.BCDA / IPDA.CHDA / IPDA.13; IPDA.EDCA / IPDA.CHDA / IPDA.13;IPDA.BCDA / IPDA.CHDA / IPDA.14; IPDA.EDCA / IPDA.CHDA / IPDA.14;IPDA.BCDA / IPDA.CHDA / IPDA.15; IPDA.EDCA / IPDA.CHDA / IPDA.15;IPDA.BCDA / IPDA.CHDA / IPDA.16; IPDA.EDCA / IPD.CHDA / IPDA.16;IPDA.BCDA / IPDA.CHDA / IPDA.18; IPDA.EDCA / IPDA.CHDA / IPDA.18;IPDA.BCDA / IPDA.CHDA / IPDA.36; IPDA.EDCA / IPDA.CHDA / IPDA.36; where BCDA and EDCA designate respectively the dicarboxylic acids of formula:where CHDA designates 1 ,4-cyclohexanedicarboxylic acid; where 9, 10, 11 and 12 designate respectively the diamines of formula H2N-(CH2)g- NH2, H2N-(CH2)IO-NH2, H2N-(CH2)I I-NH2 and H2N-(CH2)i2-NH2; where 13, 14, 15, 16, 18 and 36 denote the number of C atoms of the dicarboxylic acid Y of formula HOOC-(CH2)y-COOH where y is an integer; where IPDA designates the diamine of formulawhere TMD designates 2,2,4-TMD, 2,4,4-TMD or a mixture 2,2,4-TMD and 2,4,4-TMD; where BAC designates 1 ,3-BAC and / or 1 ,4-BAC which have respective formula:being preferably 1 ,3-BAC.Claim 28. Polyamide (PA) according to any one of the preceding claims, wherein the proportion of aromatic recurring units in polyamide (PA) is lower than or equal to 5.0 mol%, preferably lower than or equal to 1 .0 mol%, preferably lower than 0.5 mol%, this proportion being based on the total amount of recurring units in polyamide (PA) or wherein polyamide (PA) does not comprise aromatic recurring units.Claim 29. Polyamide (PA) according to any one of the preceding claims, which is free of recurring units derived from MACM or recurring units derived from PACM or which does not comprise recurring units derived from MACM or PACM, the expression "free of" meaning that the proportion of said units is lower than or equal to 1 .5 mol% (<1 .5 mol%), preferably lower than or equal to 1 .0 mol% (<1 .0 mol%),preferably lower than or equal to 0.5 mol% (<0.5 mol%), this proportion being based on the total amount of recurring units in polyamide (PA).Claim 30. Polyamide (PA) according to any one of the preceding claims, which is free of recurring units derived from MACM and recurring units derived from PACM or which does not comprise recurring units derived from MACM and PACM, the expression "free of" meaning that the proportion of said units is lower than or equal to 1 .5 mol% (<1 .5 mol%), preferably lower than or equal to 1 .0 mol% (<1 .0 mol%), preferably lower than or equal to 0.5 mol% (<0.5 mol%), this proportion being based on the total amount of recurring units in polyamide (PA).Claim 31 . Polyamide (PA) according to any one of the preceding claims, where the end-groups of the polyamide (PA) are selected in the group of -NH2, -COOH and amide end-groups.Claim 32. Polyamide (PA) according to any one of the preceding claims, exhibiting an average (C / N) molar ratio (noted (C / N)av) of at least 10.0, (C / N)av being calculated according to formula (I) below:where:■ pi and (C / N )i are respectively the proportion in mol% and (C / N) molar ratio of recurring unit number i of generic formula -C(=O)-G-NH- where G is a divalent radical consisting of C and H atoms or of C, H, N and O atoms;■ (C / N)i = number of C atoms in said recurring unit number i I number of N atoms in said recurring unit number I; or being determined by microanalysis.Claim 33. Polyamide (PA) according to any one of the preceding claims, exhibiting a glass transition temperature Tg which is:- at least at least 120.0°C, preferably at least 130.0°C, preferably at least 140.0°C, preferably at least 150.0°C; and / or- between 100.0 and 200.0°C;Tg being determined by Differential Scanning Calorimetry (DSC) according to ASTM D3418, notably with a heating and cooling rate of 20°C / min.Claim 34. Polyamide (PA) according to any one of the preceding claims, wherein the polyamide is semi-crystalline or amorphous.Claim 35. Polyamide (PA) according to any one of the preceding claims, wherein the polyamide is semi-crystalline and exhibits:- a heat of fusion (Hm) greater than or equal to 30.0 J / g (> 30.0 J / g); and / or- a melting temperature (Tm) of at least 180.0°C;Hm and Tm being measured by DSC according to the conditions provided in the Experimental Section.Claim 36. Polyamide (PA) according to any one of the preceding claims, exhibiting- a number average molecular weight ("Mn") ranging from 5,000 g / mol to 40,000 g / mol; and / or- a weight average molecular weight ("Mw") of at least 8,000 g / mol, preferably at least 10,000 g / mol, preferably at least 20,000 g / mol;Mn and Mw being determined by Size Exclusion Chromatography (SEC) according to the conditions provided in the Experimental Section.Claim 37. Polyamide (PA) according to any one of the preceding claims, exhibiting and Inherent viscosity (IV) between 0.30 and 1.70 dL / g, IV being measured according to ASTM D5225 with the use of a mixture phenol / 1 , 1 ,2,2- tetrachloroethane (60 / 40 wt. ratio).Claim 38. Polyamide (PA) according to any one of the preceding claims, wherein the diamine component (A) consists of the indicated diamines and / or the dicarboxylic acid component (B) consists of the indicated dicarboxylic acids.Claim 39. Method of preparation of a polyamide as defined in any one of claims 1- 38, by polycondensation, the method notably comprising a step of heating a reaction mixture (RM) comprising, consisting essentially of or consisting of:- a mixture of monomers (MM) consisting essentially of or consisting of all the monomers constituting the polyamide (PA);- optionally a catalyst, notably selected in the group consisting of phosphorous acid, ortho-phosphoric acid, meta-phosphoric acid, alkali- metal hypophosphite such as sodium hypophosphite and phenylphosphinic acid;- optionally at least one capping agent;- optionally water in a proportion which is preferably less than 80.0 wt.%, preferably less than 50.0 wt.% water, this proportion of water is based on the total weight of the reaction mixture (RM).Claim 40. Polymer composition (C) comprising:- at least one polyamide (PA) as defined in any one of claims 1 -38, the proportion of polyamide(s) (PA) being notably at least 30.0 wt%, this proportion being based on the total weight of polymer composition (C);- optionally at least one filler (F);- at least one polymer additive which is not a filler, notably selected in the group consisting of heat stabilizers, UV stabilizers, colorants, antistatic agents, nucleators and combination of two or more of said additives;- optionally at least one polyamide other than polyamide (PA).Claim 41 . Polymer composition (C) according to claim 40, where all the components of polymer composition (C) are blended.Claim 42. Polymer composition (C) according to claim 40 or 41 , wherein the proportion of polyamide(s) (PA) is from 30.0 wt% to 100.0 wt% or from 30.0 to 90.0 wt% or from 50.0 to 90.0 wt%.Claim 43. Use of polyamide (PA) as defined in any one of claims 1 -38 or polymer composition (C) as defined in any one of claims 40-42 for the preparation of a transparent or translucent article.Claim 44. Article made or or comprising the polyamide (PA) as defined in any one of claims 1-38 or the polymer composition (C) as defined in any one of claims 40- 42.

Images