Pyrotechnic circuit breaker comprising a polymer composition based on a polyphtalamide

Abstract

The invention relates to pyrotechnic circuit breaker for disconnecting an electrical conductor comprising: ▪ at least one electrical conductor; ▪ at least one pyrotechnical blasting charge designed to explode if triggered by an electrical and / or thermal impulse; wherein the pyrotechnic circuit breaker comprises at least one part (p) which is made of or comprises a polymer composition (PC) which itself comprises: ▪ at least one semi-crystalline polyphtalamide (PPA); ▪ at least 15.0 wt% of glass fibers (GF); ▪ at least 5.0 wt% of at least one non-halogenated flame retardant (FR); ▪ optionally at least one plastic additive, notably selected in the group consisting of impact modifiers (IM), plasticizers, colorants, pigments, antistatic agents, dyes, lubricants, thermal stabilizers, light stabilizers, flame retardants, nucleating agents, antioxidants, UV absorbers, acid scavengers and combinations thereof; ▪ the glass fibers (GF), the non-halogenated flame retardant (FR) and the optional plastic additive being blended with the polyphtalamide (PPA).

Description

Pyrotechnic circuit breaker comprising a polymer composition based on a polyphtalamideThis application claims priority of US provisional application N°63 / 612,876 filed on 20 December 2023, European patent application N°24150145.1 filed on 3 January 2024 and European patent application N°24195090.6 filed on 19 August 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.[FIELD OF THE INVENTION]

[0001] The present invention relates to a pyrotechnic circuit breaker for cutting off an electrical circuit, comprising a polymer composition (PC) based on a polyphtalamide (PPA). It also relates to the use of a polymer composition (PC) for the preparation of a pyrotechnic circuit breaker.[BACKGROUND OF THE INVENTION]

[0002] Electric vehicles are now widely used in many developed countries. The battery system used in a conventional all-electric or hybrid vehicle is required to store large amounts of energy within the confines of a relatively small battery enclosure.

[0003] In case of accident, due to the energy densities and voltages / currents associated with such battery system, it is imperative that the high voltage battery pack be very swifty decoupled from the vehicle's electrical system.

[0004] Pyrotechnic circuit breakers that are used to disconnect the battery from the electrical system of the vehicle are now widely used to remedy this problem. A pyrotechnic circuit breaker comprises at least one pyrotechnical blasting charge which can be triggered electrically and / or thermally in order to cause an explosion that liberates sufficient kinetic energy to disconnect a conductor. Examples of pyrotechnic circuit breakers are for instance the PSS4 of Autoliv described in EP 3301701 or the C13500 of Hirtenberger described in US 10,418,212. Other examples of pyrotechnic circuit breakers are disclosed in DE 102012212509; on Fig. 4 of US 2013 / 0154352 or in US 9,953,783 B2.

[0005] US 11,342,145 B2 discloses a pyrotechnic switch comprising a housing formed by a first housing part assembled with a second housing part and at least one pyrotechnical actuator arranged in the housing, wherein the first housing is made of a plastic selected in the group of polyphtalamide, polyoxyethylene and poly(methyl methacrylate).

[0006] US 7,239,225 B2 discloses a pyrotechnic circuit breaker including an upper housing and a lower housing, which may be made of metal, ceramic or polymer, preferably a suitable high-strength, high-temperature polymer thermoplastic or thermoset such as Ryton®, Amodel®, Ultem®, Phenolic®, Zytel® and the like.

[0007] WO 2022 / 017837 (DI) discloses a pyrotechnic switch with a polyamide 6T / XT where X is undefined or a polyamide 6T / 66.

[0008] A pyrotechnic circuit breaker having parts made of a plastic material is sought after because of the gain of weight associated with the use of plastic. Yet, the plastic material needs to exhibit a combination of physico-chemical properties in order to withstand the explosive environment, so that the parts of the pyrotechnic circuit breaker that are meant to be impacted by the blast of the pyrotechnical blasting charge can resist from the blast.

[0009] The plastic material needs to retain a high structural integrity to explosive environments, good thermal and electrical insulation, excellent flame retardancy and injection moldability to enable serial manufacturing.

[0010] Moreover, the pyrotechnic circuit breaker needs to withstand thermal resistance such as a high Tg and / or a high Tm in order to be used in some hot environments, such as close to a battery.

[0011] The pyrotechnic circuit breaker and the polymer composition of the invention aim at solving this technical problem.[BRIEF DISCLOSURE OF THE INVENTION]

[0012] The invention is notably disclosed in the appended claims.

[0013] The invention relates to a pyrotechnic circuit breaker as defined in any one of claims 1-20.

[0014] The invention also relates to the use as defined in claims 21-38.

[0015] More precisions and details about these subject-matters are now provided below.[DEFINITIONS]

[0016] wt% means % by weight. mol% means % by mole.

[0017] In all numerical ranges (notably in those staring with "between" and also in those without upper or lower end points), unless otherwise indicated, the end-points are included.

[0018] In the present application, unless otherwise indicated, any specific embodiment or technical feature relating to a subject-matter is applicable to and interchangeable with another embodiment or technical feature also relating to the same subject-matter and disclosed elsewhere in the application.

[0019] The proportion of recurring units are given in mol% and relative to the total proportion of recurring units in the polymer.

[0020] The proportion of the components of the polymer composition (PC) are given in wt% and relative to the total weight of the polymer composition (PC).

[0021] Tg: glass transition temperature; Tm: melting temperature; Hm: heat of fusion.[DETAILED DESCRIPTION OF THE INVENTION]

[0022] As a first aspect, the invention relates to a pyrotechnic circuit breaker for disconnecting an electrical conductor comprising:■ at least one electrical conductor;■ at least one pyrotechnical blasting charge designed to explode if triggered by an electrical and / or thermal impulse; wherein the pyrotechnic circuit breaker comprises at least one part (p) which is made of or comprises a polymer composition (PC) which itself comprises, consists essentially of or consists of■ at least one semi-crystalline polyphtalamide (PPA);■ at least 15.0 wt% of glass fibers (GF);■ at least 5.0 wt% of at least one non-halogenated flame retardant (FR);■ optionally at least one plastic additive, notably selected in the group consisting of impact modifiers (IM), plasticizers, colorants, pigments, antistatic agents, dyes, lubricants, thermal stabilizers, light stabilizers, flame retardants, nucleating agents, antioxidants, UV absorbers, acid scavengers and combinations thereof;■ the glass fibers (GF), the non-halogenated flame retardant (FR) and the optional plastic additive being blended with the polyphtalamide (PPA),wherein polyphtalamide (PPA) designates a polyamide comprising at least 50.0 mol% of recurring units (RPPA), this proportion being based on the total amount of recurring units in the polyamide, formed from the condensation of (i) a phthalic acid selected from the group consisting of terephthalic acid, isophthalic acid and a combination of terephthalic and isophthalic acid and (ii) at least one aliphatic diamine of formula 2HN-R-NH2, where R is a C4-C18 alkylene group.

[0023] Pyrotechnic circuit breakers are principally known in the art, and here it can be referred to the prior art documents which are discussed in the background section of the present invention but also to many other documents.

[0024] The pyrotechnical blasting charge is also known in the art. It comprises at least one pyrotechnic material or explosive. The pyrotechnic material may for instance be the potassium salt of l,4-dihydro-5,7-dinitrobenzofurazan-4-ol-3-oxide (aka K benzanate), K / Ca 2,4,6-trinitrobenzene-l,3-bis(olate) or lead 2,4,6-trinitroresorcinate (aka lead trizinate).

[0025] A pyrotechnic circuit breaker is designed to work in the following way. In case of emergency (e.g. car accident), the pyrotechnical blasting charge is triggered by an electrical and / or thermal impulse thereby causing an explosion. The blast of the explosion propagates within the pyrotechnic circuit breaker and is designed to interrupt the flow of the electric current passing through the conductor. In the embodiments of pyrotechnic circuit breakers disclosed below, the energy released by the explosion of the pyrotechnical blasting charge causes the breakage of the conductor, notably through the impact of a movable part (embodiment (1)) or causes a portion of the electrical conductor to move from a first position where the current can flow to a second position where the current is stopped from flowing (embodiment (2)). These preferred pyrotechnic circuit breakers for which the present invention is intended are explained in more details below.

[0026] Embodiment (1): in the pyrotechnic circuit breaker according to the 1stembodiment, the energy released by the explosion of the pyrotechnical blasting charge causes the breakage of the electrical conductor. Typically, the breakage results from the impact of a movable part (mp) with the electrical conductor, the movable part being actuated by said energy released. Examples of pyrotechnic circuit breakers according to the 1stembodiment are disclosed in e.g. US 2021 / 082645, US 2022 / 0336174 or in US 10,068,732. An example of movable part (mp) is part (34) on Fig. 2 of US 7,239,225 B2 or part (34) of Fig. 6 and Fig. 7a of US 7,239,225 B2.

[0027] An example of a pyrotechnic circuit breaker illustrating the 1stembodiment of the invention is disclosed in Fig. 1 / 4 and Fig. 2 / 4. Fig. 1 / 4 shows an oblique view of a pyrotechnic circuit breaker (1) comprising a first "top" housing part (2) and a second "bottom" housing part (3). One or both housing parts are made of or comprise the polymer composition (PC) as defined herein. The two housing parts (2) and (3) may be securely connected, for example screwed. The two housing parts (2) and (3) form an interior (7) which is divided by the conductor (5) into a sub-chamber (8) and a subchamber (9). The electrical conductor (5) may have two electric connections (6). The isolating element (10) forms a chamber (11) in which a pyrotechnical blasting can be located. The isolating element (10) comprises a sealing plate (12) serving as a displaceable wall of the chamber (11). The sealing plate (12) is mounted so as to be linearly displaceable in a direction perpendicular to the longitudinal extension of the conductor (5). The isolating element (10) furthermore may comprise an isolating web (15) that protrudes beyond from the sealing plate, perpendicularly in the direction of the conductor (5). During explosion of the pyrotechnic blasting charge, an overpressure builds up in the explosion chamber (11). The overpressure of the explosion exerts a force on the sealing plate (12) in the direction of the conductor (5), the sealing part acting as a movable part. Under the pressure, the conductor is broken into two parts (16) and (17) as is visible on Fig. 2 / 4. With the use of an isolating material for part (15), an electric arc can also be prevented.

[0028] A pyrotechnic circuit breaker according to this 1stembodiment comprises a first "top" housing part (2), a second "bottom" housing part (3), an isolating element (10) comprising a sealing plate (12) serving as a displaceable wall of the enclosure (11), the sealing plate (12) being mounted so as to be linearly displaceable in a direction perpendicular to the longitudinal extension of the conductor (5), the two housing parts(2) and (3) forming an interior (7) which is divided by the conductor (5) into a subchamber (8) and a sub-chamber (9), wherein at least one of the housing parts (2) and(3) or both of them are made of or comprise the polymer composition (PC).

[0029] Embodiment (2): in the pyrotechnic circuit breaker according to 2ndembodiment, the energy released by the explosion of the pyrotechnical blasting charge causes a portion of the electrical conductor to move from a first position where the current can flow to a second position where the current is stopped from flowing. The interest of this 2ndembodiment is that the electrical conductor is not broken, so that the position of the portion having moved may be restored so as to allow the current to flow again. Anexample of pyrotechnic circuit breakers according to the 2ndembodiment is disclosed in e.g. WO 2020 / 064567.

[0030] An example of pyrotechnic circuit breaker illustrating the second embodiment of the invention is disclosed on Fig. 3 / 4 and Fig. 4 / 4 The pyrotechnic circuit breaker comprises a first conductor (106), a second conductor (108) and a third conductor (110), a housing (114) arranged to enclose the third conductor (110) and a retaining member (112) which acts to retain the third conductor (110) in electrical contact with the first and second conductors (106), (108) to define the current conduction path. The housing (114) preferably is made of or comprises the polymer composition (PC). The current conduction path is defined by a first conductor (106), a second conductor (108) and a third conductor (110). These conductors are separate components, arranged to define a current conduction path by way of a temporary joint between the first (106), second (108) and third (110) conductors. The pyrotechnic circuit breaker comprises a housing (114) arranged to enclose the third conductor (110). First (106) and second (108) conductors may comprise connection contacts (106a), (108a) provided outside of housing (114) for connection to one or more electrical circuits. The temporary joint may be provided by way of a retaining member (112) (shown within the dotted box of FIG. 3), which acts to retain the third conductor (110) in electrical contact with the first and second conductors (106), (108) to define the current conduction path. Contact surfaces at which the first conductor (106) contacts the third conductor (110), and at which the second conductor (108) contacts the third conductor (110), may extend parallel to one another in order to facilitate this direct electrical and physical contact. In the arrangement described with reference to Figs. 3 and 4, the retaining member (112) may be rendered breakable mainly through form, due to the introduction of a mechanical weakness within the retaining member (112). The retaining member (112) retains the third conductor (110) by exerting or applying, a force in a direction substantially opposite to a direction of movement of the third conductor (110); the reaction force between the retaining member (112) and the portions of the housing (114) which support the retaining member acts to resist motion of the third conductor until an actuating force greater than the force supplied by the retaining member (112) is applied. An actuating force is here provided by a pyrotechnic actuator (102), arranged to release the blast into the chamber (104) upon ignition. The pyrotechnic actuator (102) comprises connector pins (102a) and an igniter (102b). The connector pins (102a) activate a pyrotechnical blasting charge inside the igniter (102b) uponreceipt of an ignition signal. The pyrotechnic actuator (102) is arranged to, upon activation or ignition of the pyrotechnical blasting charge, to cause an explosion to propagate inside the chamber (104). In this arrangement, the pyrotechnic circuit breaker comprises a piston (120), which piston comprises a void that defines the chamber (104). The blast expelled into the chamber (104) produces an actuating force which acts on the third conductor (110) to cause the third conductor to move from a first position towards a second position in a direction of movement (130). The force acts on the third conductor (110) via the piston (120), but it will be understood that the force may act on the third conductor (110) directly, or via any other suitable component provided between the pyrotechnic actuator (102) and the third conductor (110). When the third conductor is in the first position, the switch is closed and when it is in the second position the switch is open. In the second, open position, the third conductor is electrically separate from the first and second conductors such that no current can flow through the current conduction path.

[0031] The part (p) which is made of or comprises the polymer composition (PC) is typically a part designed to be exposed to the explosion of the pyrotechnic blasting charge. This part (p) needs to be resistant. According to an embodiment, the part (p) is at least one of the internal walls of the pyrotechnic circuit breaker to be exposed to the explosion of the pyrotechnic blasting charge.

[0032] According to another embodiment, the part (p) is a movable part (mp) within the pyrotechnic circuit breaker.

[0033] According to an embodiment, the part (p) is at least one of the internal walls of at least one enclosure (e) of the pyrotechnic circuit breaker in which the blast of the explosion propagates either because the pyrotechnical blasting charge is located inside said enclosure (e) or because it is located outside the enclosure (e) but propagates inside the said enclosure (e).

[0034] Typically, the enclosure (e) is a chamber as disclosed above.

[0035] Typically also, the part (p) is at least one housing of the pyrotechnic circuit breaker.

[0036] Part (p) is prepared by a process of transformation of a polymeric material known to the skilled person. Injection moulding is one of these processes.

[0037] In a second aspect, the present invention relates to the use of a polymer composition (PC) as defined herein as the material or one of the materials of at least one part (p) of a pyrotechnic circuit breaker, notably as defined herein. The pyrotechnic circuit breaker may notably be according to the 1stor 2ndembodiment.

[0038] In a third aspect, the present invention relates to the use of a polymer composition (PC) as defined herein for the preparation of at least one housing of a pyrotechnic circuit breaker, notably as defined herein. The pyrotechnic circuit breaker may notably be according to the 1stor 2ndembodiment.

[0039] For instance, the polymer composition (PC) as defined herein may be used for the preparation of the housing (22) of Fig. 2 of US 7,239,225 B2 or the housing (114) of Fig. 1A of WO 2020 / 064567. The polymer composition (PC) as defined herein may also be used for the preparation of the housing of the circuit breaker defined in US 2023 / 0260727 or WO 2022 / 017837, notably as defined in the claims of US 2023 / 0260727 or WO 2022 / 017837.

[0040] All details disclosed in the present disclosure relating to the polyphtalamide (PPA) and / or the polymer composition (PC) apply to the invention of the 2ndand 3rdaspect.

[0041] More details are now given for the polymer composition (PC).

[0042] Polymer composition (PC)

[0043] The polymer composition (PC) comprises, consists essentially of or consists of:- at least one semi-crystalline polyphtalamide (PPA) as disclosed herein;- at least 15.0 wt% of glass fibers (GF);- at least 5.0 wt% of at least one non-halogenated flame retardant (FR);- optionally at least one plastic additive, notably selected in the group consisting of impact modifiers (IM), plasticizers, colorants, pigments, antistatic agents, dyes, lubricants, thermal stabilizers, light stabilizers, flame retardants, nucleating agents, antioxidants, UV absorbers, acid scavengers and combinations thereof;- the glass fibers (GF), the non-halogenated flame retardant (FR) and the optional plastic additive being blended with the polyphtalamide (PA).The proportions of the components of the polymer composition (PC) are expressed in wt% and relative to the total weight of the polymer composition (PC).

[0044] According to an embodiment (E) of the present disclosure, the polymer composition (PC) comprises, consists essentially of or consists of:- at least one semi-crystalline polyphtalamide (PPA) as disclosed herein;- at least 15.0 wt% of glass fibers (GF);- at least 5.0 wt% of at least one non-halogenated flame retardant (FR);- at least one impact modifier (IM);- optionally at least one plastic additive, notably selected in the group consisting of plasticizers, colorants, pigments, antistatic agents, dyes, lubricants, thermal stabilizers, light stabilizers, flame retardants, nucleating agents, antioxidants, UV absorbers, acid scavengers and combinations thereof;- the glass fibers (GF), the non-halogenated flame retardant (FR), the impact modifier, (IM) and the optional plastic additive being blended with the polyphtalamide (PA).

[0045] An impact modifier (IM) is a polymer additive that improves the impact resistance or impact strength of a polymer. The impact modifier typically absorbs or dissipates the energy of impact through its elastomeric domains.

[0046] The impact modifier (IM) that can be present in the polymer composition (PC) is notably selected in the group of functionalized ethylene-based (co)polymers and functionalized propylene-based (co)polymers, such as: maleic anhydride functionalized ethylene-based (co)polymers; propylene-based (co)polymers on which maleic anhydride is grafted; ethylene-based copolymers comprising glycidyl (meth)acrylate as comonomer.In the maleic anhydride functionalized ethylene-based (co)polymers, the maleic anhydride is either grafted on the ethylene-based (co)polymer or is a comonomer. Examples of functionalized ethylene-based copolymers are the terpolymers of ethylene, alkyl acrylate and of maleic anhydride or of glycidyl (meth)acrylate. Lotader® and Lotader® T (e.g. Lotader® 4700T) commercialized by SK group are examples of functionalized ethylene-based (co)polymers (see https: / / sk- fp . com / roduct- category / I otader / ) .

[0047] The impact modifier (IM) that can be present in the polymer composition (PC) disclosed herein is notably selected in the group consisting of (co)polymers of ethylene with from 0.01 to 5.0% by weight of grafted maleic anhydride; (co)polymers of propylene with from 0.01 to 5.0% by weight of grafted maleic anhydride; terpolymers of ethylene, alkyl acrylate and of maleic anhydride or of glycidyl (meth)acrylate and combination thereof, the (co)polymer of ethylene being notably selected in the group consisting of polyethylene, copolymers of ethylene with propylene, copolymers of ethylene with butene, copolymers of ethylene with hexene, copolymers of ethylene with octene.

[0048] The proportion of impact modifier(s) (if any) in the polymer composition (PC) is generally between 1.0 and 20.0 wt%, preferably between 1.0 and 15.0 wt%.

[0049] The polymer composition (PC) is preferably free of a silicon-based polymer. A silicon-based polymer is a polymer having recurring units comprising -Si-O- moiety where Si is substituted by at least one organic group R. An example of silicon-based polymer is polydimethylsiloxane comprising the following recurring units:. The expression “free of’ means in the context of the present invention that the proportion of the silicon-based polymer is lower than or equal to 3.0 wt%, preferably lower than or equal to 2.0 wt%, preferably lower than or equal to 1.0 wt%, preferably lower than or equal to 0.5 wt%, preferably lower than or equal to 0.1 wt%, preferably lower than or equal to 0.05 wt%. Preferably, the polymer composition (PC) does not comprise a silicon-based polymer.

[0050] All components of the polymer composition (PC) are preferably blended together.

[0051] Properties of the polymer composition (PC)

[0052] The polymer composition (PC) exhibits a tensile strength measured according to ISO 527-1 : 2019 (type 1A bars; 5 mm / min) of at least 100 MPa, preferably at least 150 MPa, preferably at least 200 MPa.

[0053] The flammability of the polymer composition is evaluated with UL-94 standard released by Underwriters Laboratories of the United States which is the standard test for evaluating the flammability of plastic materials for parts in devices and appliances. UL-94 is used to measure the burning rate and characteristics based on standard samples. Sample size is 12.7 mm by 127 mm, with the thickness varying from 0.8 mm to 3.2 mm. The polymer composition (PC) preferably exhibits a flammability rating measured according to UL-94 (Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances) which is V-0 (thickness: 0.8 mm; vertical bum test; 50 W).

[0054] Impact properties are measured according to ASTM D376 - for details about this, see https: / / plastics.ulprospector.com / properties / ASTMD3763.

[0055] The polymer composition (PC) preferably exhibits a total energy at break measured according to ASTM D3763 (23°C; 3 mm thickness, 3.3 m / s speed of testing) of at least 6.5 J, preferably at least 7.0 J.

[0056] The polymer composition (PC) preferably exhibits an energy at peak E measured according to ASTM D3763 (23°C; 3 mm thickness, 3.3 m / s speed of testing) of at least 5.0 J, preferably at least 5.5 J. The energy at peak E is aka energy to peak load.

[0057] All these properties can be measured according to the details provided in the Experimental Section.

[0058] As a second aspect, the invention also relates to the use of a polymer composition (PC) as defined herein for the preparation of an internal part of a pyrotechnic circuit breaker.

[0059] Polyphtalamide (PPA)

[0060] Polyphtalamide (PPA) is a polyamide comprising at least 50.0 mol% of recurring units (RPPA), this proportion being based on the total amount of recurring units in the polyamide, formed from the condensation of (i) a phthalic acid selected in the group consisting of terephthalic acid (T), isophthalic acid (I) and combination of terephthalic and isophthalic acid and (ii) at least one aliphatic diamine of formula 2HN-R-NH2 where R is a C4-C18 alkylene group.

[0061] The proportion of recurring units (RPPA) is at least 50.0 mol%. This proportion may be strictly superior to 50.0 mol% (> 50.0 mol%) or at least 53.0 mol%. This proportion may be between 50.0 and 100.0 mol%.

[0062] R may be more particularly a C4-C12 alkylene group. The diamine that is condensed with the phthalic acid may more particularly be hexamethylene diamine, decanediamine and combination thereof.

[0063] The polyphtalamide (PPA) is prepared by the condensation of a dicarboxylic acid component (A) and a diamine component (B). The dicarboxylic acid component (A) comprises the phtalic acid and the diamine component (B) comprises the at least one aliphatic diamine.

[0064] The polyphtalamide (PPA) may comprise recurring units (RPPA*) other than recurring units (RPPA). Recurring units (RPPA*) are formed from the condensation of a dicarboxylic acid and a diamine wherein the dicarboxylic acid is not a phthalic acid and / or the diamine is not an aliphatic diamine.

[0065] The polyphtalamide (PPA) disclosed herein may be selected in the group consisting of 6T / 6V66 and 6T / 6I. According to an embodiment of the present invention, the polyphtalamide (PPA) is 6T / 6I / 66. According to an embodiment of the present invention, the polyphtalamide (PPA) is 6T / 6I.

[0066] The glass transition temperature (Tg) of the polyphthalamide (PPA) is preferably at least 110.0°C, preferably at least 115.0°C, preferably at least 120.0°C, Tg being measured by Differential Scanning Calorimetry (“DSC”) according to ASTM D3418, notably using a heating and cooling rate of 20°C / min.

[0067] The melting temperature (Tm) of the polyphthalamide (PPA) is preferably at least 300°C, Tm being measured by Differential Scanning Calorimetry (“DSC”) according to ASTM D3418, notably using a heating and cooling rate of 20°C / min.

[0068] The heat of fusion (Hm) of the of the polyphthalamide (PPA) is typically between 50.0 and 60.0 J / g, Hm being measured by Differential Scanning Calorimetry (“DSC”) according to ASTM D3418, notably using a heating and cooling rate of 20°C / min.

[0069] According to an embodiment of the present invention, the polyphthalamide (PPA) disclosed herein is selected in the group consisting of: polyamide 6T / 6I / 66 exhibiting a glass transition temperature (Tg) of at least 115.0°C, preferably at least 120.0°C and a melting temperature (Tm) of at least 300°C, Tg and Tm being measured by Differential Scanning Calorimetry (“DSC”) according to ASTM D3418, notably using a heating and cooling rate of 20°C / min; polyamide 6T / 66 exhibiting a glass transition temperature (Tg) of at least 115.0°C, preferably at least 120.0°C, preferably at least 125.0°C and a melting temperature (Tm) of at least 300°C, preferably at least 310.0°C, Tg and Tm being measured by Differential Scanning Calorimetry (“DSC”) according to ASTM D3418, notably using a heating and cooling rate of 20°C / min.

[0070] The proportion of polyphtalamide(s) in the polymer composition (PC) is generally between 20.0 and 80.0 wt%. This proportion is preferably at least 25.0 wt%, preferably at least 35.0 wt%. This proportion is preferably between 35.0 and 60.0 wt% or between 35.0 and 55.0 wt%.

[0071] Glass fibers (GF)

[0072] The GF present in the polymer composition (PC) are dispersed in the composition.

[0073] Glass fibers are silica-based glass compounds that contain several metal oxides which can be tailored to create different types of glass. The GFs comprise silica (SiO2) as the main oxide and one or more oxides selected in the group consisting of calcium oxide (CaO), sodium oxide (Na2O), potassium oxide (IGO), boron oxide (B2O3), calcium oxide (CaO), magnesium oxide (MgO), lithium oxide (IGO) and alumina (AI2O3).

[0074] According to an embodiment, the GFs comprise: SiCh between 40.0 and 65.0 wt%; AI2O3 between 5.0 and 20.0 wt%; CaO+MgO between 15.0 and 30.0 wt%, B2O3 between 5.0 and 15.0 wt% and Na2O+K2O less then 4.0 wt%.

[0075] The arithmetic average length (Lav) of the GFs in the polymer composition (PC) is in the range of 100 micron to 1000 micron, more preferred in the range of 150 - 700 micron. Still more preferred range is 200-350 microns.

[0076] The arithmetic average length has the meaning usually used in statistics. Lav can be obtained from a distribution of lengths of the GFs by the following formula:where:- Li is the length of the ith glass fiber;- n is the number of glass fibers measured.

[0077] The distribution corresponds to the distribution of the lengths of the GFs dispersed in the polymer composition (PC). The distribution is generally obtained by observing with a microscope a statistically significant number n (e.g. at least 200, preferably at least 5000) of glass fibers separated from the polymer composition (PC). The separation of the GFs from the polymer composition (PC) may be performed according to the ash method or according to the chemical method. The ash method consists in heating a sample of the polymer composition (PC) at a temperature sufficient to decompose the polymeric component of the polymer composition (PC) and in recovering the GFs. The separation of the GFs from the polymer composition (PC) may also be performed by a chemical method. The chemical method consists in heating the sample of the polymer composition (PC) in a solution of sulfuric acid and recovering the GFs.

[0078] Lav can be determined according to ISO 22314 2006.

[0079] The proportion of GF in the polymer composition (PC) is at least 15.0 wt%, this proportion being based on the total weight of the polymer composition (PC).

[0080] This proportion is preferably at least 20.0 wt%, preferably at least 25.0 wt%, preferably at least 30.0 wt%.

[0081] This proportion is preferably at most 55.0 wt%, preferably at most 50.0 wt%.

[0082] This proportion is preferably between 30.0 and 55.0 wt%.

[0083] Non-halogenated flame retardant (FR)

[0084] Polymer composition (PC) contains at least 5.0 wt% of at least one non-halogenated flame retardant (FR).

[0085] The non-halogenated flame retardant (FR) may more particularly be or comprise a compound of formula (I) or of formula (II):where:- Ri and R2 are each a linear or branched C1-C16 alkyl group;- R3 is a C1-C10 linear or branched alkylene group; an arylene group or an alkylarylene group;- M is calcium or aluminium ion;- m is 2 or 3;- n is 1 or 3;- x is 1 or 2.

[0086] Ri and R2 are preferably a linear or branched Ci-Cs alkyl group. Ri and R2 may more particularly be independently selected in the group consisting of methyl, ethyl, n- propyl, isopropyl, n-butyl, tert-butyl, n-pentyl and n-octyl.

[0087] R3 may be a C1-C10 linear or branched alkylene group, such as ethylene, n-propylene, isopropylene, n-butylene, tert-butylene, n-pentylene, n-octylene or n-dodecylene.

[0088] R3 may be an arylene group, such as phenylene.

[0089] R3 may be an alkyl arylene group, such as methylphenylene, ethylphenylene or tertbutylphenylene.

[0090] R3 may be an aryl alkylene group, such as phenylmethylene, ethylphenylene or tertbutylphenylene.

[0091] Suitable non-halogenated flame retardant may be a calcium or aluminium salt of a phosphinic acid such as isobutylemethyl phosphinic acid, octylmethyl phosphinic acid, diethyl phosphinic acid, methyl-n-propyl phosphinic acid, methane- 1,2- di(methylphosphinic acid), ethane- 1,2 — (dimethylphosphinic acid), hexane- 1,6-di(methylphosphinic acid), benzene- l,4-(dimethylphosphinic acid), methylphenyl phosphinic acid or diphenylphosphinic acid.

[0092] The non-halogenated flame retardant (FR) used in polymer composition (PC) may more particularly be or comprise (more particularly comprise at least 75.0 wt%, this proportion being based on the total weight of the FR, of) a calcium or aluminium salt of a phosphinic acid such as isobutyl emethyl phosphinic acid, octylmethyl phosphinic acid, diethyl phosphinic acid, methyl -n-propyl phosphinic acid, methane- 1,2- di(methylphosphinic acid), ethane- 1,2 — (dimethylphosphinic acid), hexane- 1,6- di(methylphosphinic acid), benzene- l,4-(dimethylphosphinic acid), methylphenyl phosphinic acid or diphenylphosphinic acid. The non-halogenated flame retardant (FR) used in polymer composition (PC) may more particularly be or comprise at least75.0 wt% of aluminum salt of diethylphosphinic acid, this proportion being based on the total weight of the FR.

[0093] According to an embodiment, the non-halogenated flame retardant comprises a compound of formula (I) or (II) in combination with a nitrogen-containing compound such as dimelamine pyrophosphate, melamine polyphosphate, melamine cyanurate, melam, melem or melon. melammelemmelon

[0094] According to another embodiment, the non-halogenated flame retardant comprises a compound of formula (I) or (II) in combination with a metal complex comprising ametal Met selected in the group consisting of Zn, Al, Ca and Fe; a hydroxy group ligand and another ligand of formula (III), (IV) or (V):where Y is O or S, preferably O. The metal complex may more particularly be any one disclosed in WO 2021 / 048155, notably any one of the examples of WO 2021 / 048155.

[0095] The proportion of FR in the polymer composition (PC) is between 5.0 and 20.0 wt%, this proportion being based on the total weight of the polymer composition (PC).

[0096] Plastic additive(s)

[0097] In addition to the GF and FR, the polymer composition (PC) may comprise at least one plastic additive. The plastic additive is different from the glass fiber (GF) and the flame retardant (FR). The plastic additive other than the glass fiber (GF) and the flame retardant (FR) is typically selected in the group consisting of impact modifiers (IM), plasticizers, colorants, pigments, antistatic agents, dyes, lubricants, thermal stabilizers, light stabilizers, flame retardants, nucleating agents, antioxidants, UV absorbers, acid scavengers and combinations thereof.

[0098] According to embodiment (E) disclosed before, the plastic additive is different from the glass fiber (GF), the impact modifier (IM) and the flame retardant (FR). The plastic additive other the glass fiber, the impact modifier and the flame retardant is typically selected in the group consisting of plasticizers, colorants, pigments, antistatic agents, dyes, lubricants, thermal stabilizers, light stabilizers, flame retardants, nucleating agents, antioxidants, UV absorbers, acid scavengers and combinations thereof.

[0099] Process of preparation of the polymer composition (PC)

[0100] The polymer composition (PC) is prepared by a compounding method comprising a step in which the polyphtalamide (PPA) is melted and mixed with the other components of the polymer composition (PC). This ensures that all components of the polymer composition (PC) are blended together.

[0101] 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.

[0102] The compounding method may conveniently be performed with an extruder such as a single screw extruder or a twin screw extruder. The components other than the polyphtalamide can be incorporated in the polyphtalamide in a side feeder of the extruder.

[0103] The conditions provided in the Experimental Section may be followed for the preparation of polymer composition (PC).

[0104] The present examples E1-E2 illustrate the invention.

[0105] Raw materials used

[0106] All the following raw materials are commercially available.

[0107] Polyamides used:- Amodel® A1006: polyphtalamide 6T / 6I / 66 (Tg about 125°C; Hm about 55 J / g) from Solvay Specialty Polymers USA, LLC;- Amodel® A8002: polyphtalamide 6T / 6I (Tg about 135°C; Hm about 58 J / g) from Solvay Specialty Polymers USA, LLC;- Polyamide 66: from Radipol .

[0108] Glass fibers used: Jushi 568H; these GFs have a silane-based sizing and exhibit the following characteristics: type: E-Glass diameter: ~10 pm (ISO 1888-2006) average length of the fibers before incorporation into the polymer compositions: ~1 mm (Q / JS J0361-2010)

[0109] Flame retardants used:- Exolit® 1400: from Clariant; mixture of 80 wt% of aluminum salt of diethylphosphinic acid and 20 wt% of PHOPHAL (aluminium phosphate);- Exolit® 1230: from Clariant: aluminum salt of diethylphosphinic acid.

[0110] Preparation of the polymer compositions

[0111] The polymer compositions were prepared by first tumble blending pellets or powders of the resins and additives to be blended at the desired compositional ratios for about 20 minutes, followed by melt compounding the obtained mixture using a 26 mm diameter Coperion ZSK-26 corotating partially intermeshing twin screw extruder having an L / D ratio of 48: 1. The extruder had 12 barrel sections with barrel sections 2 through 6 being heated with set point temperature of 340°C, barrel sections 7through 9 being heated with set point temperature of 310°C, barrel section 10 with set point temperature of 280°C, barrel sections 11 and 12 being heated with set point temperature of 240°C. The die section was also set to a temperature of 325°C. The ingredient mixture pre-blend was fed at barrel section 1 using a gravimetric feeder at nominal throughput rates ranging from 17.5 to 28 Ib / hr. The extruder was operated at a screw speed of about 200 rpm and vacuum venting was applied at barrel section 10 during compounding to strip off moisture and any possible residual volatiles from the compound. A single-hole die was used for all the compounds and the molten polymer strand exiting the die was cooled in a water trough and then cut in a pelletizer to form pellets approximately 3.0 mm in length by 2.7 mm in diameter.

[0112] UL-94 test

[0113] The standard UL-94 test was performed with the following conditions: 50 W, vertical burn test; thickness of samples: 0.8 mm.

[0114] Mechanical properties

[0115] Tensile strength: measured according to ISO 527-1 : 2019 with type 1 A bars and with a speed of 5 mm / min.

[0116] Impact properties: measured according to ASTM D3763. Test speed used was 3.3 m / sec and specimen size was 100mm x 100mm x 3 mm. The tup (impactor head) diameter was 12.7 mm. Temperature of testing: 23°C.

[0117] The polymer compositions (PC) of examples E1-E2 have the required properties to be used in the preparation of one part (p) of a pyrotechnic circuit breaker.Table I

Claims

CLAIMSClaim 1. Pyrotechnic circuit breaker for disconnecting an electrical conductor comprising:■ at least one electrical conductor;■ at least one pyrotechnical blasting charge designed to explode if triggered by an electrical and / or thermal impulse; wherein the pyrotechnic circuit breaker comprises at least one part (p) which is made of or comprises a polymer composition (PC) which itself comprises, consists essentially of or consists of:■ at least one semi-crystalline polyphtalamide (PPA);■ at least 15.0 wt% of glass fibers (GF);■ at least 5.0 wt% of at least one non-halogenated flame retardant (FR);■ optionally at least one plastic additive, notably selected in the group consisting of impact modifiers (IM); plasticizers; colorants; pigments; antistatic agents; dyes; lubricants; thermal stabilizers; light stabilizers; flame retardants; nucleating agents; antioxidants; UV absorbers; acid scavengers and combinations thereof;■ the glass fibers (GF), the non-halogenated flame retardant (FR) and the optional plastic additive being blended with the polyphtalamide (PPA);■ the proportion of the components of the polymer composition (PC) being given in wt% and relative to the total weight of the polymer composition (PC); wherein polyphtalamide (PPA) designates a polyamide comprising at least 50.0 mol% of recurring units (RPPA), this proportion being based on the total amount of recurring units in the polyamide, formed from the condensation of (i) a phthalic acid selected from the group consisting of terephthalic acid, isophthalic acid and a combination of terephthalic and isophthalic acid and (ii) at least one aliphatic diamine of formula 2HN-R-NH2, where R is a C4-C18 alkylene group.Claim 2. Pyrotechnic circuit breaker according to claim 1, wherein the energy released by the explosion of the pyrotechnical blasting charge causes the breakage of the conductor, notably through the impact of a movable part (embodiment (1)) or causes a portion of the electrical conductor to move from a first position where the current can flow to a second position where the current is stopped from flowing (embodiment (2)).Claim 3. Pyrotechnic circuit breaker according to any of the preceding claims, wherein the polymer composition (PC) comprises or consists of:- at least one semi-crystalline polyphtalamide (PPA) as disclosed herein;- at least 15.0 wt% of glass fibers (GF);- at least 5.0 wt% of at least one non-halogenated flame retardant (FR);- at least one impact modifier (IM);- optionally at least one plastic additive, notably selected in the group consisting of plasticizers, colorants, pigments, antistatic agents, dyes, lubricants, thermal stabilizers, light stabilizers, flame retardants, nucleating agents, antioxidants, UV absorbers, acid scavengers and combinations thereof;- the glass fibers (GF), the non-halogenated flame retardant (FR), the impact modifier, (IM) and the optional plastic additive being blended with the polyphtalamide (PA).Claim 4. Pyrotechnic circuit breaker according to any of the preceding claims, wherein the polymer composition (PC) exhibits a tensile strength measured according to ISO 527-1 : 2019 (type 1 A bars; 5 mm / min) of at least 100 MPa, preferably at least 150 MPa, preferably at least 200 MPa.Claim 5. Pyrotechnic circuit breaker according to any of the preceding claims, wherein the polymer composition (PC) exhibits a flammability rating measured according to UL-94 (Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances) which is V-0 (thickness: 0.8 mm; vertical burn test; 50 W).Claim 6. Pyrotechnic circuit breaker according to any of the preceding claims, wherein the polymer composition (PC) exhibits a total energy at break measured according to ASTM D3763 (23°C; 3 mm thickness, 3.3 m / s speed of testing) of at least 6.5 J, preferably at least 7.0 J.Claim 7. Pyrotechnic circuit breaker according to any of the preceding claims, wherein the polymer composition (PC) exhibits an energy at peak E measured according to ASTM D3763 (23°C; 3 mm thickness, 3.3 m / s speed of testing) of at least 5.0 J, preferably at least 5.5 J.Claim 8. Pyrotechnic circuit breaker according to any of the preceding claims, wherein the polyphtalamide (PPA) is selected in the group consisting of 6T / 6I / 66 and 6T / 6I.Claim 9. Pyrotechnic circuit breaker according to any of the preceding claims, wherein:- the glass transition temperature (Tg) of the polyphthalamide (PPA) is at least 110.0°C, preferably at least 115.0°C, preferably at least 120.0°C, Tg being measured by Differential Scanning Calorimetry (“DSC”) according to ASTM D3418, notably using a heating and cooling rate of 20°C / min; and / or- the melting temperature (Tm) of the polyphthalamide (PPA) is at least 300°C, Tm being measured by Differential Scanning Calorimetry (“DSC”) according to ASTM D3418, notably using a heating and cooling rate of 20°C / min.Claim 10. Pyrotechnic circuit breaker according to any of the preceding claims, wherein the heat of fusion (Hm) of the of the polyphthalamide (PPA) is between 50.0 and 60.0 J / g, Hm being measured by Differential Scanning Calorimetry (“DSC”) according to ASTM D3418, notably using a heating and cooling rate of 20°C / min.Claim 11. Pyrotechnic circuit breaker according to any of the preceding claims, wherein the proportion of polyphtalamide(s) in the polymer composition (PC) is between 20.0 and 80.0 wt%, preferably between 35.0 and 60.0 wt% or between 35.0 and 55.0 wt%.Claim 12. Pyrotechnic circuit breaker according to any of the preceding claims, wherein the proportion of GFs in the polymer composition (PC) is:- at least 20.0 wt%, preferably at least 25.0 wt%, preferably at least 30.0 wt%; and / or- between 30.0 and 55.0 wt%.Claim 13. Pyrotechnic circuit breaker according to any one of the preceding claims, wherein the non-halogenated flame retardant is or comprises a compound of formula (I) or of formula (II):where:- Ri and R2 are each a linear or branched C1-C16 alkyl group;- R3 is a C1-C10 linear or branched alkylene group; an arylene group or an alkylarylene group;- M is calcium or aluminium ion;- m is 2 or 3;- n is 1 or 3;- x is 1 or 2; or wherein the non-halogenated flame retardant is or comprises (more particularly comprises at least 75.0 wt%, this proportion being based on the total weight of the FR, of) a calcium or aluminium salt of a phosphinic acid such as isobutylemethyl phosphinic acid, octylmethyl phosphinic acid, diethyl phosphinic acid, methyl-n-propyl phosphinic acid, methane- 1,2- di(methylphosphinic acid), ethane-1,2 — (dimethylphosphinic acid), hexane-1,6- di(methylphosphinic acid), benzene- l,4-(dimethylphosphinic acid), methylphenyl phosphinic acid or diphenylphosphinic acid.Claim 14. Pyrotechnic circuit breaker according to any one of the preceding claims, wherein the proportion of FR in the polymer composition (PC) is between 5.0 and 20.0 wt%Claim 15. Pyrotechnic circuit breaker according to any one of the preceding claims, wherein the part (p) is at least one of the internal walls of at least one enclosure (e) of the pyrotechnic circuit breaker in which the blast of the explosion propagates either because the pyrotechnical blasting charge is located inside said enclosure (e) or because it is located outside the enclosure (e) but propagates inside the said enclosure (e).Claim 16. Pyrotechnic circuit breaker according to any one of the preceding claims, wherein the polymer composition (PC) is free of a silicon-based polymer where silicon-based polymer designates a polymer having recurring units comprising -Si-O- moiety where Si is substituted by at least one organic group R and where the expression “free of” means that the proportion of the silicon-based polymer in the polymer composition (PC) is lower than or equal to 3.0wt%, preferably lower than or equal to 2.0 wt%, preferably lower than or equal to 1.0 wt%, preferably lower than or equal to 0.5 wt%, preferably lower than or equal to 0.1 wt%, preferably lower than or equal to 0.05 wt%, this proportion being based on the total weight of the polymer composition (PC).Claim 17. Pyrotechnic circuit breaker according to any one of the preceding claims, wherein the part (p) is at least one housing of the pyrotechnic circuit breaker and / or a movable part (mp) within the pyrotechnic circuit breaker.Claim 18. Pyrotechnic circuit breaker according to any one of the preceding claims, wherein the impact modifier (IM) is selected in the group of functionalized ethylene-based (co)polymers and functionalized propylene-based (co)polymers, such as: maleic anhydride functionalized ethylene-based (co)polymers; propylene-based (co)polymers on which maleic anhydride is grafted; ethylene-based copolymers comprising glycidyl (meth)acrylate as comonomer.Claim 19. Pyrotechnic circuit breaker according to any one of the preceding claims, wherein the impact modifier (IM) is selected in the group consisting of (co)polymers of ethylene with from 0.01 to 5.0% by weight of grafted maleic anhydride; (co)polymers of propylene with from 0.01 to 5.0% by weight of grafted maleic anhydride; terpolymers of ethylene, alkyl acrylate and of maleic anhydride or of glycidyl (meth)acrylate and combination thereof, the (co)polymer of ethylene being notably selected in the group consisting of polyethylene, copolymers of ethylene with propylene, copolymers of ethylene with butene, copolymers of ethylene with hexene, copolymers of ethylene with octene.Claim 20. Pyrotechnic circuit breaker according to any one of the preceding claims, wherein the polyphthalamide (PPA) is selected in the group consisting of: polyamide 6T / 6I / 66 exhibiting a glass transition temperature (Tg) of at least 115.0°C, preferably at least 120.0°C and a melting temperature (Tm) of at least 300°C, Tg and Tm being measured by Differential Scanning Calorimetry (“DSC”) according to ASTM D3418, notably using a heating and cooling rate of 20°C / min; polyamide 6T / 66 exhibiting a glass transition temperature (Tg) of at least 115.0°C, preferably at least 120.0°C, preferably at least 125.0°C and a melting temperature (Tm) of at least 300°C, preferably at least 310.0°C, Tg and Tm being measured byDifferential Scanning Calorimetry (“DSC”) according to ASTM D3418, notably using a heating and cooling rate of 20°C / min.Claim 21. Use of a polymer composition (PC) as the material or one of the materials of at least a part (p) of a pyrotechnic circuit breaker, notably as defined in any one of claims 1-20, wherein the polymer composition (PC) comprises, consists essentially of or consists of■ at least one semi-crystalline polyphtalamide (PPA);■ at least 15.0 wt% of glass fibers (GF);■ at least 5.0 wt% of at least one non-halogenated flame retardant (FR);■ optionally at least one plastic additive, notably selected in the group consisting of impact modifiers (IM); plasticizers; colorants; pigments; antistatic agents; dyes; lubricants; thermal stabilizers; light stabilizers; flame retardants; nucleating agents; antioxidants; UV absorbers; acid scavengers and combinations thereof;■ the glass fibers (GF), the non-halogenated flame retardant (FR) and the optional plastic additive being blended with the polyphtalamide (PPA);■ the proportion of the components of the polymer composition (PC) being given in wt% and relative to the total weight of the polymer composition (PC); wherein polyphtalamide (PPA) designates a polyamide comprising at least 50.0 mol% of recurring units (RPPA), this proportion being based on the total amount of recurring units in the polyamide, formed from the condensation of (i) a phthalic acid selected from the group consisting of terephthalic acid, isophthalic acid and a combination of terephthalic and isophthalic acid and (ii) at least one aliphatic diamine of formula 2HN-R-NH2, where R is a C4- Cis alkylene group.Claim 22. Use of a polymer composition (PC) for the preparation of at least one housing of a pyrotechnic circuit breaker, notably as defined in any one of claims 1-20, wherein the polymer composition (PC) comprises, consists essentially of or consists of■ at least one semi-crystalline polyphtalamide (PPA);■ at least 15.0 wt% of glass fibers (GF);■ at least 5.0 wt% of at least one non-halogenated flame retardant (FR);■ optionally at least one plastic additive, notably selected in the group consisting of impact modifiers (IM); plasticizers; colorants; pigments; antistatic agents; dyes; lubricants; thermal stabilizers; light stabilizers; flame retardants;nucleating agents; antioxidants; UV absorbers; acid scavengers and combinations thereof;■ the glass fibers (GF), the non-halogenated flame retardant (FR) and the optional plastic additive being blended with the polyphtalamide (PPA);■ the proportion of the components of the polymer composition (PC) being given in wt% and relative to the total weight of the polymer composition (PC); wherein polyphtalamide (PPA) designates a polyamide comprising at least 50.0 mol% of recurring units (RPPA), this proportion being based on the total amount of recurring units in the polyamide, formed from the condensation of (i) a phthalic acid selected from the group consisting of terephthalic acid, isophthalic acid and a combination of terephthalic and isophthalic acid and (ii) at least one aliphatic diamine of formula 2HN-R-NH2, where R is a C4- Cis alkylene group.Claim 23. Use according to claim 21 or 22, wherein the polymer composition (PC) comprises or consists of:- at least one semi-crystalline polyphtalamide (PPA) as disclosed herein;- at least 15.0 wt% of glass fibers (GF);- at least 5.0 wt% of at least one non-halogenated flame retardant (FR);- at least one impact modifier (IM);- optionally at least one plastic additive, notably selected in the group consisting of plasticizers, colorants, pigments, antistatic agents, dyes, lubricants, thermal stabilizers, light stabilizers, flame retardants, nucleating agents, antioxidants, UV absorbers, acid scavengers and combinations thereof;- the glass fibers (GF), the non-halogenated flame retardant (FR), the impact modifier, (IM) and the optional plastic additive being blended with the polyphtalamide (PA).Claim 24. Use according to any one of claims 21-23, wherein the polymer composition (PC) exhibits a tensile strength measured according to ISO 527-1 : 2019 (type 1A bars; 5 mm / min) of at least 100 MPa, preferably at least 150 MPa, preferably at least 200 MPa.Claim 25. Use according to any one of claims 21-24, wherein the polymer composition (PC) exhibits a flammability rating measured according to UL-94 (Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances) which is V-0 (thickness: 0.8 mm; vertical bum test; 50 W).Claim 26. Use according to any one of claims 21-25, wherein the polymer composition (PC) exhibits a total energy at break measured according to ASTM D3763 (23°C; 3 mm thickness, 3.3 m / s speed of testing) of at least 6.5 J, preferably at least 7.0 J.Claim 27. Use according to any one of claims 21-26, wherein the polymer composition (PC) exhibits an energy at peak E measured according to ASTM D3763 (23°C; 3 mm thickness, 3.3 m / s speed of testing) of at least 5.0 J, preferably at least 5.5 J.Claim 28. Use according to any one of claims 21-27, wherein the polyphtalamide (PPA) is selected in the group consisting of 6T / 6I / 66 and 6T / 6I.Claim 29. Use according to any one of claims 21-28, wherein:- the glass transition temperature (Tg) of the polyphthalamide (PPA) is at least 110.0°C, preferably at least 115.0°C, preferably at least 120.0°C, Tg being measured by Differential Scanning Calorimetry (“DSC”) according to ASTM D3418, notably using a heating and cooling rate of 20°C / min; and / or- the melting temperature (Tm) of the polyphthalamide (PPA) is at least 300°C, Tm being measured by Differential Scanning Calorimetry (“DSC”) according to ASTM D3418, notably using a heating and cooling rate of 20°C / min.Claim 30. Use according to any one of claims 21-29 wherein the proportion of polyphtalamide(s) in the polymer composition (PC) is between 20.0 and 80.0 wt%, preferably between 35.0 and 60.0 wt% or between 35.0 and 55.0 wt%.Claim 31. Use according to any one of claims 21-30, wherein the proportion of GFs in the polymer composition (PC) is:- at least 20.0 wt%, preferably at least 25.0 wt%, preferably at least 30.0 wt%; and / or- between 30.0 and 55.0 wt%.Claim 32. Use according to any one of claims 21-31, wherein the non-halogenated flame retardant is or comprises a compound of formula (I) or of formula (II):(I)(II) where:- Ri and R2 are each a linear or branched C1-C16 alkyl group;- R3 is a C1-C10 linear or branched alkylene group; an arylene group or an alkylarylene group;- M is calcium or aluminium ion;- m is 2 or 3;- n is 1 or 3;- x is 1 or 2; or wherein the non-halogenated flame retardant is or comprises (more particularly comprises at least 75.0 wt%, this proportion being based on the total weight of the FR, of) a calcium or aluminium salt of a phosphinic acid such as isobutylemethyl phosphinic acid, octylmethyl phosphinic acid, diethyl phosphinic acid, methyl-n-propyl phosphinic acid, methane- 1,2- di(methylphosphinic acid), ethane-1,2 — (dimethylphosphinic acid), hexane-1,6- di(methylphosphinic acid), benzene- l,4-(dimethylphosphinic acid), methylphenyl phosphinic acid or diphenylphosphinic acid.Claim 33. Use according to any one of claims 21-32, wherein the proportion of FR in the polymer composition (PC) is between 5.0 and 20.0 wt%Claim 34. Use according to any one of claims 21-33, wherein the polymer composition (PC) is free of a silicon-based polymer where silicon-based polymer designates a polymer having recurring units comprising -Si-O- moiety where Si is substituted by at least one organic group R and where the expression “free of” means that the proportion of the silicon-based polymer in the polymer composition (PC) is lower than or equal to 3.0 wt%, preferably lower than or equal to 2.0 wt%, preferably lower than or equal to 1.0 wt%, preferably lower than or equal to0.5 wt%, preferably lower than or equal to 0.1 wt%, preferably lower than or equal to 0.05 wt%, this proportion being based on the total weight of the polymer composition (PC).Claim 35. Use according to any one of claims 21-34, wherein the impact modifier (IM) is selected in the group of functionalized ethylene-based (co)polymers and functionalized propylene-based (co)polymers, such as: maleic anhydride functionalized ethylene-based (co)polymers; propylene-based (co)polymers on which maleic anhydride is grafted; ethylene-based copolymers comprising glycidyl (meth)acrylate as comonomer.Claim 36. Use according to any one of claims 21-35, wherein the impact modifier (IM) is selected in the group consisting of (co)polymers of ethylene with from 0.01 to 5.0% by weight of grafted maleic anhydride; (co)polymers of propylene with from 0.01 to 5.0% by weight of grafted maleic anhydride; terpolymers of ethylene, alkyl acrylate and of maleic anhydride or of glycidyl (meth)acrylate and combination thereof, the (co)polymer of ethylene being notably selected in the group consisting of polyethylene, copolymers of ethylene with propylene, copolymers of ethylene with butene, copolymers of ethylene with hexene, copolymers of ethylene with octene.Claim 37. Use according to any one of claims 21-36, wherein the polyphthalamide (PPA) is selected in the group consisting of: polyamide 6T / 6I / 66 exhibiting a glass transition temperature (Tg) of at least 115.0°C, preferably at least 120.0°C and a melting temperature (Tm) of at least 300°C, Tg and Tm being measured by Differential Scanning Calorimetry (“DSC”) according to ASTM D3418, notably using a heating and cooling rate of 20°C / min; polyamide 6T / 66 exhibiting a glass transition temperature (Tg) of at least 115.0°C, preferably at least 120.0°C, preferably at least 125.0°C and a melting temperature (Tm) of at least 300°C, preferably at least 310.0°C, Tg and Tm being measured by Differential Scanning Calorimetry (“DSC”) according to ASTM D3418, notably using a heating and cooling rate of 20°C / min.Claim 38. Use according to any one of claims 21-37 wherein the heat of fusion (Hm) of the of the polyphthalamide (PPA) is between 50.0 and 60.0 J / g, Hm being measured by DifferentialScanning Calorimetry (“DSC”) according to ASTM D3418, notably using a heating and cooling rate of 20°C / min.

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