Plastic protective tarpaulin for a surface against dust and / or splashes of at least one fluid, and method for manufacturing such a plastic protective tarpaulin.

Abstract

The present invention relates to a plastic protective sheet (10) with a surface comprising one or more (co)polyolefins, the mass fraction of which is greater than or equal to 50%. Said sheet (10) comprises six sub-layers (40-90), each comprising at least one (co)polyolefin. The first and sixth sub-layers (10, 90) each comprise at least one mineral filler and optionally at least one coloring agent, and the third and fourth sub-layers (60, 70) each comprise at least one polymeric adhesive. The plastic protective sheet (10) has a thickness greater than or equal to 80 µm. The present invention also relates to a method for manufacturing said plastic protective sheet (10). Figure 1.

Description

Title of the invention: Plastic protective tarpaulin for a surface against dust and / or splashes of at least one fluid, and method for manufacturing such a plastic protective tarpaulin. technical field

[0001] The present invention relates to a protective tarpaulin for a surface against dust and / or projections of at least one fluid.

[0002] The present invention also relates to a method for manufacturing a protective cover for a surface against dust and / or projections of at least one fluid. Previous technique

[0003] It is known that when carrying out construction, renovation or extension work in the building sector, the surfaces of the room(s) under construction or in the passageway (for example the exterior surfaces of furniture (sofas, ...), floors, walls or any other surface requiring protection) should be protected from dust and / or particles and / or liquids, such as paint, grease or other liquid splashes, by placing a protective tarpaulin on these surfaces.

[0004] The structure and composition of protective tarpaulins are determined according to their specific applications. For example, when it is required that the tarpaulin be tear-resistant and stay in place on the surface to be protected, such as the ground, without creasing, and without necessarily using an adhesive agent or slipping on the surface, this type of tarpaulin includes, for example, a cardboard layer waterproofed on one side by a polymer film, or a polymer film reinforced with synthetic fibers or non-woven felt. The disadvantages of these tarpaulins are that they contain materials of different types and therefore cannot be recycled to manufacture new tarpaulins. Furthermore, tarpaulins containing cardboard or felt do not conform as well to the surfaces to be protected and potentially create creases that can lead to tearing.

[0005] Protective tarpaulins are thus sought which conform to the surfaces to be protected, which are tear-resistant, which do not form creases and are able to stay in position without the use of an adhesive agent, and finally whose recyclability is improved.

[0006] Protective tarpaulins that are tear-resistant are also required. These tarpaulins will be trampled on during the work.

[0007] Finally, protective tarpaulins that can be colored are sought in order to identify whether a surface is actually protected. Indeed, a transparent or opaque protective tarpaulin does not allow for quick identification of whether a surface is properly protected. Furthermore, it may be desirable to color the protective tarpaulin differently in order to assign a specific function to one of its sides. Description of the invention

[0008] The present invention relates, according to a first aspect, to a plastic protective tarpaulin with a surface area, said tarpaulin being waterproof, said plastic protective tarpaulin comprising one or more (co)polyolefins, the ratio of the total mass of the (co)polyolefin(s) in the total mass of said protective tarpaulin is greater than or equal to 50%, said protective tarpaulin has a first face and a second face, and said protective tarpaulin comprises, at least, from its first face to its second face: - a first underlayer comprising at least one (co)polyolefin A and at least one mineral filler, and possibly at least one colouring agent; - a second underlayer comprising at least one (co)polyolefin B, and possibly at least one mineral filler, - a third underlayer comprising at least a (co)polyolefin Cl, and possibly at least a polymeric adhesive agent C2, - a fourth underlayer comprising at a (co)polyolefin Dl, and possibly at least one polymeric adhesive agent D2; - a fifth sub-layer comprising at least one (co)polyolefin E, and possibly at least one mineral filler, - a sixth sub-layer comprising at least a (co)polyolefin F and at least one mineral filler, and possibly at least one coloring agent, - said protective tarpaulin having a thickness greater than or equal to 80 pm.

[0009] Advantageously, the plastic protective tarpaulin comprises several polymeric underlayers which can have different compositions, and therefore different functions, which facilitates control of the quantity of certain expensive and problematic components for recyclability, such as a colouring agent, or those impacting the desired adhesive function with regard to the mineral filler.

[0010] Advantageously, the plastic protective tarpaulin comprises six polymeric underlayers which gives it a high surface mass, and thus good adhesion to the surfaces to be protected without the need for an adhesive agent (e.g., adhesive tape).

[0011] Advantageously, the plastic protective tarpaulin does not include fibers, a textile layer, or a cardboard layer, so that it is flexible and perfectly conforms to the surfaces to be protected without forming a crease.

[0012] Advantageously, the first and sixth sub-layers each comprise at least one mineral filler. This arrangement gives the external surfaces of the first and sixth sub-layers a non-adherent property to the surfaces to be protected.

[0013] This differentiation of the presence or absence of a mineral filler between the sub-layers makes it possible to attribute a bonding function to certain sub-layers since the mineral fillers are not present in all the sub-layers of the tarpaulin, in particular in the third and fourth sub-layers.

[0014] Advantageously, the first, second and third sub-layers are co-extruded together, and the fourth, fifth and sixth sub-layers are co-extruded together.

[0015] This arrangement would improve the mechanical properties of the protective tarpaulin (particularly tear resistance) because potential defects during extrusion are distributed, and therefore divided, randomly in the different extruded sub-layers and are not concentrated in a single sub-layer forming the entire protective tarpaulin.

[0016] Advantageously, the first and sixth sub-layers are extruded from the same polymer composition.

[0017] Advantageously, the first and sixth sublayers are in the same polymeric composition.

[0018] Advantageously, the (co)polyolefin(s) A and F are identical.

[0019] Advantageously, the first and sixth sub-layers comprise the same mineral filler(s) and / or the same coloring agent(s).

[0020] Advantageously, the second and fifth sub-layers are extruded from the same polymer composition.

[0021] Advantageously, the second and fifth sublayers are in the same polymeric composition.

[0022] Advantageously, (co)polyolefin(s) B and E are identical.

[0023] Advantageously, the third and fourth sub-layers are extruded from the same polymer composition.

[0024] Advantageously, the third and fourth sub-layers are in the same polymeric composition.

[0025] Advantageously, the (co)polyolefin(s) Cl and DI are identical.

[0026] Advantageously, the polymeric adhesive agents C2 and D2 are identical.

[0027] The (co)polyolefin(s) A, B, Cl, Dl, E, and F may be different, or identical, preferably they are identical.

[0028] Preferably, the plastic protective cover is an extruded-blown and flattened sheath.

[0029] Advantageously, the plastic protective cover, or said sheath, comprises two layers, such as two polymeric films, glued together.

[0030] In particular, a first polymeric layer, or first film, comprises, in particular, is essentially made up of the first, second, and third sub-layers.

[0031] In particular, a second polymeric layer, or second film, comprises, in particular, essentially consists of the fourth, fifth, and sixth sub-layers.

[0032] Preferably, said sheath comprises a lower zone, or edge, and an upper zone, or edge, between which a longitudinal direction extends, and a first lateral edge, or side, and a second lateral edge, or side, between which a transverse direction extends, in particular said transverse direction is substantially perpendicular to the longitudinal direction.

[0033] The first edge, or side, lateral, and / or the second edge, or side, lateral, can / can be cut along the longitudinal direction of the sheath.

[0034] Preferably, the plastic protective tarpaulin comprises, or the first and second polymeric films comprise respectively, first and second layers joined together, and heat-bonded to each other via the third and fourth sub-layers, in particular via the internal faces of the third and fourth sub-layers to each other.

[0035] Preferably, the first and second layers are substantially parallel to each other.

[0036] Preferably, the first and second layers each comprise an inner face, the inner faces of said first and second layers being opposite each other, in particular corresponding to the inner faces respectively of the third and fourth sub-layers.

[0037] Advantageously, the third and fourth sub-layers each comprise at least one thermoplastic elastomer comprising C2 or D2 olefinic repeat units, which promotes the adhesion / bonding of said sub-layers to each other when they are not yet cooled after their extrusion, and therefore hot at the exit of the extrusion blow molding die.

[0038] Advantageously, the third and fourth sub-layers do not contain any mineral filler. Indeed, a mineral filler would alter the adhesion properties. sub-layers between them, and would prevent the bonding function provided by olefinic thermoplastic elastomers, notably Cl and Dl.

[0039] Advantageously, the second and / or third and / or fourth and / or fifth sub-layers do not include (each) a mineral filler. Plastic protective tarpaulin

[0040] The plastic protective tarpaulin is preferably stored rolled up on itself around a support, such as a roller.

[0041] The plastic protective cover preferably has a substantially rectangular or square shape, with a length greater than or equal to its width.

[0042] The plastic protective tarpaulin comprises first and second faces corresponding respectively to the outer face of the first sub-layer and the outer face of the sixth sub-layer.

[0043] The plastic protective tarpaulin includes a longitudinal direction extending between its upper and lower edges, and a transverse direction extending between its first and second lateral edges, the transverse direction being in particular substantially perpendicular to the longitudinal direction.

[0044] It is understood in this text that the plastic protective tarpaulin is waterproof that it does not allow water, and in particular liquids (paints, greases, solvents, etc.), to pass through from its first side to its second side.

[0045] Advantageously, the plastic protective cover is in the form of a monolithic main film.

[0046] Advantageously, the mass fraction of thermoplastic (co)polymer(s) in the plastic protective cover is greater than or equal to 50%, preferably greater than or equal to 65%.

[0047] Preferably, the plastic protective tarpaulin has a surface mass greater than or equal to 100 g / m2, more preferably greater than or equal to 150 g / m2, preferably greater than or equal to 200 g / m2.

[0048] Preferably, the plastic protective tarpaulin has a surface mass less than or equal to 400 g / m2, more preferably less than or equal to 350 g / m2, preferably less than or equal to 300 g / m2, for example from 250 g / m2 to + / - 30 g / m2.

[0049] Preferably, the plastic protective tarpaulin has a thickness greater than or equal to 100 pm, more preferably greater than or equal to 150 pm, preferably greater than or equal to 200 pm, for example from 230 pm to + / - 30 pm.

[0050] Preferably, the plastic protective tarpaulin has a thickness less than or equal to 400 pm, more preferably less than or equal to 350 pm, preferably less than or equal to 300 pm.

[0051] Advantageously, the ratio of the total mass of (co)polyolefin(s), and possibly of thermoplastic elastomer(s) comprising C2 or D2 olefinic repeating units or of polymeric adhesive agent(s), to the total mass of the protective tarpaulin is greater than or equal to 50%, preferably greater than or equal to 60%, even more preferably greater than or equal to 65%.

[0052] Advantageously, the ratio of the total mass of (co)polyolefin(s), and possibly of thermoplastic elastomer(s) comprising C2 or D2 olefinic repeating units or of polymeric adhesive agent(s), to the total mass of the protective tarpaulin is less than or equal to 90%, preferably less than or equal to 80%, even more preferably less than or equal to 75%.

[0053] Advantageously, the ratio of the total mass of thermoplastic elastomer(s) comprising olefinic repeating units of which C2 and D2 elastomers or polymeric adhesive agent(s), to the total mass of the protective tarpaulin is greater than or equal to 0.5%, preferably greater than or equal to 1%, even more preferably greater than or equal to 2%, for example 2.5% to within + / - 1.5%.

[0054] Advantageously, the ratio of the total mass of polymeric adhesive agent(s), in particular thermoplastic elastomer(s) comprising olefinic repeating units including C2 and D2 elastomers, to the total mass of the protective tarpaulin is less than or equal to 40%, preferably less than or equal to 30%, even more preferably less than or equal to 20%, preferably less than or equal to 10%.

[0055] Advantageously, the ratio of the total mass of mineral filler(s) to the total mass of the protective cover is greater than or equal to 5%, preferably greater than or equal to 10%, even more preferably greater than or equal to 20%, preferably greater than or equal to 25%, for example 28.5% to within + / - 5%.

[0056] Advantageously, the ratio of the total mass of mineral filler(s) to the total mass of the protective cover is less than or equal to 45%, preferably less than or equal to 40%, even more preferably less than or equal to 35%, preferably less than or equal to 30%.

[0057] Advantageously, the ratio of the total mass of colorant(s) to the total mass of the protective tarpaulin is greater than or equal to 1%, preferably greater than or equal to 2%, for example 3% to within + / - 2%.

[0058] Advantageously, the ratio of the total mass of colorant agent(s) to the total mass of the protective tarpaulin is less than or equal to 20%, preferably less than or equal to 15%, even more preferably less than or equal to 10%, preferably less than or equal to 6%.

[0059] Advantageously, the coloring agent(s) is / are disposed only in the first and sixth sublayers. Thus, their mass fractions in these sublayers are enhanced, as is the resulting color. The coloring agents These compounds are indeed expensive, so this approach optimizes the cost of the protective tarpaulin while achieving effective coloring of the outer surfaces of the first and sixth sub-layers. Furthermore, the optimized quantity of coloring agents facilitates the recycling of the protective tarpaulin, as the amount of coloring agents relative to the total mass of the tarpaulin is low and will have less impact on the color of the recycled tarpaulin.

[0060] The preferred colours used for the protective tarpaulin are black and white, with white being preferred for example for painting work so that the colouring of the protective tarpaulin does not interfere with the final result for the painter.

[0061] The ratio of the total mass of the said (co)polyolefins (in particular also including the polymeric adhesive agent(s)) on the total mass of said protective tarpaulin is greater than or equal to 50%, preferably greater than or equal to 60%, more preferably greater than or equal to 65%.

[0062] Advantageously, the first, second, third, fourth, fifth and sixth sublayers are co-extensive along all their surfaces.

[0063] Advantageously, the protective cover has a breaking strength greater than or equal to 30 N, in particular greater than or equal to 45 N, in the longitudinal direction L.

[0064] Advantageously, the protective cover has a breaking strength greater than or equal to 20N, in particular greater than or equal to 35N, in the transverse direction T.

[0065] Advantageously, the protective tarpaulin has a modulus of elasticity (MPa) greater than or equal to 150N in the longitudinal and / or transverse direction(s) (L,T).

[0066] Advantageously, the protective tarpaulin has an elongation at break greater than or equal to 250% in the longitudinal direction L.

[0067] Advantageously, the protective tarpaulin has an elongation at break greater than or equal to 450% in the transverse direction T.

[0068] The mechanical values ​​were determined with the ISO 527-1 and ISO 527-2 standards, dated 2019 "Plastics - Determination of tensile properties". First undercoat and / or sixth undercoat

[0069] Preferably, the mass fraction of (co)polyolefin(s) of which (co)polyolefin A is in said first sublayer, or the mass fraction of (co)polyolefin(s) of which (co)polyolefin F is in said sixth sublayer, is greater than or equal to 40%, more preferably greater than or equal to 50%.

[0070] Preferably, the mass fraction of (co)polyolefin(s) of which (co)polyolefin A is in said first sublayer, or the mass fraction of (co)polyolefin(s) of which (co)polyolefin F is in said sixth sublayer, is less than or equal to 80%, preferably less than or equal to 70%, preferably less than or equal to 60%.

[0071] Preferably, the mass fraction of mineral charge(s) in the first sub-layer, or in the sixth sub-layer, is greater than or equal to 10%, more preferably greater than or equal to 20%, preferably greater than or equal to 25%, even more preferably greater than or equal to 30%, for example 35% to within + / -3%.

[0072] Preferably, the mass fraction of mineral charge(s) in the first sub-layer, or in the sixth sub-layer, is less than or equal to 70%, more preferably less than or equal to 60%, preferably less than or equal to 50%, more preferably less than or equal to 45%, in particular less than or equal to 40%.

[0073] Preferably, the mass fraction of coloring agent(s) in the first sub-layer, or in the sixth sub-layer, is greater than or equal to 1%, more preferably greater than or equal to 5%.

[0074] Preferably, the mass fraction of coloring agent(s) in the first sub-layer, or in the sixth sub-layer, is less than or equal to 30%, more preferably less than or equal to 20%, preferably less than or equal to 15%, for example from 10% to within + / - 3%. Second underlayer and / or fifth underlayer

[0075] Preferably, the mass fraction of (co)polyolefin(s) of which (co)polyolefin B is in said second sublayer, or the mass fraction of (co)polyolefin(s) of which (co)polyolefin E is in said fifth sublayer, is greater than or equal to 40%, more preferably greater than or equal to 50%, preferably greater than or equal to 60%, more preferably greater than or equal to 65%, for example 70% to within + / -3%.

[0076] Preferably, the mass fraction of (co)polyolefin(s) of which (co)polyolefin B is in said second sublayer, or the mass fraction of (co)polyolefin(s) of which (co)polyolefin E is in said fifth sublayer, is less than or equal to 90%, more preferably less than or equal to 80%.

[0077] The mass fraction of mineral charge(s) in the second sub-layer, or in the fifth sub-layer, is greater than or equal to 10%, preferably greater than or equal to 20%, even more preferably greater than or equal to 25%, for example 30% to within + / - 3%.

[0078] The mass fraction of mineral charge(s) in the second sub-layer, or in the fifth sub-layer, is less than or equal to 70%, preferably less than or equal to 60%, even more preferably less than or equal to 50%, preferably less than or equal to 45%, in particular less than or equal to 40%.

[0079] Preferably, the second underlayer does not include a coloring agent. Third and / or fourth underlayer

[0080] Preferably, the mass fraction of (co)polyolefin(s) of which (co)polyolefin Cl in said third sublayer, or the mass fraction of (co)polyolefin(s) of which (co)polyolefin DI in said fourth sublayer, is greater than or equal to 40%, more preferably greater than or equal to 50%, preferably greater than or equal to 60%, more preferably greater than or equal to 65%, for example 75% to within + / -5%.

[0081] Preferably, the mass fraction of (co)polyolefin(s) of which (co)polyolefin Cl in said third sublayer, or the mass fraction of (co)polyolefin(s) of which (co)polyolefin DI in said fourth sublayer, is less than or equal to 90%, more preferably less than or equal to 80%.

[0082] Preferably, the mass fraction of polymeric adhesive agent(s) of which polymeric adhesive agent C2 in said third sub-layer, or the mass fraction of polymeric adhesive agent(s) of which polymeric adhesive agent D2 in said fourth sub-layer, is greater than or equal to 5%, more preferably greater than or equal to 10%, preferably greater than or equal to 15%, more preferably greater than or equal to 20%, for example 25% to within + / - 5%.

[0083] Preferably, the mass fraction of polymeric adhesive agent(s) of which polymeric adhesive agent C2 in said third sub-layer, or the mass fraction of polymeric adhesive agent(s) of which polymeric adhesive agent D2 in said fourth sub-layer, is less than or equal to 70%, more preferably less than or equal to 60%, preferably less than or equal to 50%, more preferably less than or equal to 40%, in particular less than or equal to 35%.

[0084] Preferably, the third underlayer and / or the fourth underlayer does not include a coloring agent.

[0085] Preferably, the third sub-layer and / or the fourth sub-layer does not include / do not include mineral filler. Polymeric adhesive agent

[0086] The polymeric adhesive agent C2 may be identical or different from the polymeric adhesive agent D2, preferably they are identical.

[0087] The polymeric adhesive agent C2 and / or the polymeric adhesive agent D2, and possibly any other polymeric adhesive agent used in the protective tarpaulin, is / are a (co)polymer comprising olefinic repeating units, such as ethylene and / or propylene, optionally with grafted maleic anhydride functions and / or grafted acrylate functions and / or acrylate repeating units, or a mixture of the latter.

[0088] The polymeric adhesive agent C2 and / or the polymeric adhesive agent D2, and possibly any other polymeric adhesive agent used in the protective tarpaulin, is / are hot-meltable, in particular hot-melted in at least one step, in particular an extrusion-blowing step, of the manufacturing process of the protective tarpaulin according to the invention. The polymeric adhesive agent C2 and / or the polymeric adhesive agent D2, and possibly any other polymeric adhesive agent used in the protective tarpaulin, is / are chosen from: olefinic thermoplastic elastomers, in particular comprising propylene or ethylene repeat units or a mixture thereof, such as a propylene-based elastomer; ethylene and vinyl acetate copolymers, such as EVA; (co)polyolefins grafted with reactive maleic anhydride functions, such as maleic anhydride-grafted polyethylene (e.g., MAH-g-LLDPE); (co)polymers of olefins and acrylates, such as ethylene and acrylate copolymers; or a mixture thereof.

[0089] Preferably, the polymeric adhesive agent, in particular C2 and / or D2, has a melting temperature greater than or equal to 80°C.

[0090] Preferably, the polymeric adhesive agent, in particular C2 and / or D2, has a melting temperature less than or equal to 150°C.

[0091] In one embodiment, the polymeric adhesive agent(s), including polymeric adhesive agent C2 and / or polymeric adhesive agent D2, in particular the olefinic thermoplastic elastomer(s) mentioned herein, is / are selected from: - polyisobutylenes (PIB); and / or - ethylene, propylene, and diene terpolymers (EPDM); ethylene and propylene copolymers; ethylene and alpha-olefin copolymers, for example ethylene and butene copolymers or ethylene and octene copolymers, and a mixture thereof; preferably EPDM and ethylene and propylene copolymers; and / or - mixtures of a polyolefin, in particular polypropylene, with one or more olefinic thermoplastic elastomer(s), in particular non-vulcanized, and possibly one or more plasticizers (for example mineral or naphthenic or paraffinic oil(s)), the said olefinic thermoplastic elastomer(s) may be copolymers of ethylene and propylene, terpolymers of ethylene, propylene and diene, copolymers of ethylene and alpha-olefin(s) (for example copolymers of ethylene and butene or copolymers of ethylene and octene).

[0092] In one embodiment, a polymeric adhesive agent of which polymeric adhesive agent C2 and / or polymeric adhesive agent D2, (for example a thermoplastic elastomer of ethylene and / or propylene) has (each) at least one of the following properties: - a density greater than or equal to 0.800 and less than or equal to 0.930 (g / cm3, for example measured using ASTM D1505-18), preferably greater than or equal to 0.840 and less than or equal to 0.920, or even more preferably greater than or equal to 0.850 and less than or equal to 0.900; and / or - a Shore A hardness (for example, measured using ASTM D2240, 15 sec, at 23°C) greater than or equal to 40 and less than or equal to 80, preferably greater than or equal to 50 and less than or equal to 80, and even more preferably greater than or equal to 60 and less than or equal to 75; and / or - a flexural modulus greater than or equal to 2 MPa (for example, measured using ASTM D790, at 23°C, at 1% secant), preferably greater than or equal to 5 MPa, even more preferably greater than or equal to 8 MPa, and possibly less than or equal to 15 MPa; and / or - a hot melt flow index (FMI) greater than or equal to 1 g / 10 min and less than or equal to 10 g / 10 min, preferably greater than or equal to 2 g / 10 min and less than or equal to 7 g / 10 min, preferably less than or equal to 5 g / 10 min (in particular measured at 230°C for 2.16 kg); and / or - a mass fraction of ethylene greater than or equal to 5%, preferably greater than or equal to 10%, and possibly less than or equal to 30%, or even less than or equal to 20%; and / or - a breaking strength (measured at 23°C) greater than or equal to 5 MPa and less than or equal to 30 MPa, preferably less than or equal to 20 MPa, more preferably less than or equal to 15 MPa, preferably greater than or equal to 10 MPa; and / or - an elongation at break (measured at 23°C) greater than or equal to 400%, preferably greater than or equal to 500%, more preferably greater than or equal to 600%, preferably greater than or equal to 700%, in particular greater than or equal to 800%, more particularly less than or equal to 2000%, notably less than or equal to 1500% or 1000%; and / or - a Vicat softening temperature greater than or equal to 45°C, and possibly less than or equal to 110°C. The mass fraction of ethylene is preferably measured with the ASTM D3900-17 (2021) standard. The breaking strength and elongation at break are preferably measured with the ASTM D412-16(2021) standard. Vicat softening temperature is preferably measured with the ASTM D1525-17E01 standard.

[0093] The density (g / cm3) in this text is preferably measured using ASTM D1505-18 entitled "Standard Test Method for Density of Plastics by Density Gradient Technique" or using ASTM D792-20 entitled "Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement".

[0094] The polymeric adhesive agent C2 or D2 can thus be chosen from the range of VistamaxxR elastomers marketed by ExxonMobil Chemical, or from the range of OrevacR grafted polyolefins marketed by SK functional polymer, or from the range of LotrylR ethylene and acrylate copolymers marketed by SK functional polymer.

[0095] (co)polyolefins, in particular (co)polyolefins A and / or B and / or Cl and / or DI and / or E and / or F

[0096] Said plastic protective tarpaulin comprises one or more (co)polyolefins, in particular one or more (co)polymer(s) of propylene and / or ethylene, preferably one or more (co)polymer(s) of ethylene.

[0097] The (co)polymer(s) A and / or B and / or Cl and / or DI and / or E and / or F is / are one or more (co)polymer(s) of propylene and / or ethylene, preferably one or more (co)polymer(s) of ethylene, even more preferably one or more polyethylene(s).

[0098] In the present text, ethylene (co)polymer, for example indifferently ethylene (co)polymer A and / or B and / or Cl and / or DI and / or E and / or F, means a polymer comprising an ethylene repeating unit and optionally one or more other repeating units different from the ethylene repeating unit, preferably chosen from alpha-olefin repeating units; it may be a polyethylene, in particular a polyethylene homopolymer.

[0099] Alpha-olefin repeat motifs may be or are derived from 1-hexene, 4-methyl-l-pentene, 1-octene and 1-decene and / or may be or are derived from alkenes comprising 3 to 10 carbon atoms.

[0100] The protective cover comprises, or the (co)polymer of ethylene A and / or B and / or Cl and / or DI and / or E and / or F is / are (each), one or more low-density polyethylene(s) and / or one or more linear low-density polyethylene(s).

[0101] In one embodiment, the ethylene (co)polymer A and / or B and / or Cl and / or DI and / or E and / or F is / are each an ethylene (co)polymer having a density (g / cm3, for example measured using DIN 53479) greater than or equal to 0.90, preferably greater than or equal to 0.92.

[0102] In one embodiment, the ethylene (co)polymer A and / or B and / or Cl and / or DI and / or E and / or F is / are each an ethylene (co)polymer having a density (g / cm3, for example measured using DIN 53479) less than or equal to 0.96; preferably less than or equal to 0.95, even more preferably less than or equal to 0.94.

[0103] In one embodiment, the ethylene (co)polymer A and / or B and / or Cl and / or DI and / or E and / or F is / are each an ethylene (co)polymer having a Hot Melt Flow Index (FFI) greater than or equal to 0.50 g / 10 min and less than or equal to 2 g / 10 min, preferably greater than or equal to 0.70 g / 10 min and less than or equal to 1.5 g / 10 min (preferably at 190°C for 2.16 Kg). In one embodiment, the plastic protective cover has a Hot Melt Flow Index (FFI) greater than or equal to 0.50 g / 10 min and less than or equal to 2.5 g / 10 min, preferably greater than or equal to 0.70 g / 10 min and less than or equal to 1.5 g / 10 min (preferably at 190°C for 2.16 kg). The IFC (g / 10 min) referred to in this text is preferably measured with the standard NF EN ISO 1133-1 (July 2022) entitled "Plastics - Determination of the melt flow index of thermoplastics, by mass (MFR) and by volume (MVR) - Part 1: Normal method".

[0104] The (co)polyolefin(s) may be bio-based and / or petroleum-based, or a mixture of bio-based (co)polyolefin(s) and petroleum-based (co)polyolefin(s). Mineral charge(s)

[0105] Preferably, the mineral filler(s) is / are chosen from: calcium carbonate; talc; silica, for example fumed silica or fumed silica; kaolin; metakaolin; mica; chalk; barium sulfate; titanium dioxide, or a mixture of the latter, preferably the mineral filler is calcium carbonate.

[0106] Preferably, when the colouring agent and the mineral filler are titanium dioxide, the mass fractions of colouring agent and mineral filler defined in this text are combined to give the quantity of TiO2. In a preferred example, the mineral charge(s) is / are in the form of particles, especially powder, particularly dispersed in one or more of the sub-layers, particularly in the first sub-layer, and in the sixth sub-layer. In a preferred example, the mineral charge(s) is / are fine particles with a size less than or equal to 500 pm, preferably less than or equal to 250 pm, again preferably less than or equal to 100 pm, for example less than or equal to 60 pm.

[0107] Advantageously, the said mineral filler(s) allows / allow the protective tarpaulin to be non-slip and non-sticky. Coloring agent(s)

[0108] The colouring agent(s) may be any agent compatible with (co)polyolefins in an extrusion process and suitable for imparting a specific colour.

[0109] The colouring agent(s) may be titanium dioxide or carbon black.

[0110] Titanium dioxide is preferred when the plastic protective cover is intended to protect interior surfaces.

[0111] Carbon black is preferred when the plastic protective cover is intended to protect outdoor surfaces. Definitions

[0112] In this text, thermoplastic means any (co)polymer (including elastomers) or hot-melt component, in particular having a softening or melting temperature greater than or equal to 80°C and less than or equal to 300°C, more particularly less than or equal to 280°C, more particularly less than or equal to 260°C.

[0113] In the present text, (co)polymer means any polymer comprising at least two different repeating units, in particular including copolymers and terpolymers.

[0114] In the present text, the term polymeric adhesive agent means any adhesive agent comprising several repeating units, in particular at least 10 repeating units, more particularly at least 50 repeating units.

[0115] In this text, the term polymeric adhesive agent means any (co)polymer configured to adhere / bond with a (co)polyolefin, particularly in a hot state, i.e., at the output of an extrusion-blowing step of the plastic protective tarpaulin.

[0116] In one embodiment, the (co)polyolefins A, B, Cl, DI and E are (co)polyethylenes, in particular low-density (co)polyethylenes.

[0117] Advantageously, polyethylenes offer good mechanical properties, in particular resistance to tearing and abrasion.

[0118] In one embodiment, the ratio of the total mass of (co)polyethylene(s), in particular of low density (co)polyethylene(s), to the total mass of said plastic protective tarpaulin, is greater than or equal to 50%, preferably greater than or equal to 60%.

[0119] In one embodiment, the polymeric adhesive agent C2 and / or the polymeric adhesive agent D2 is / are selected from: thermoplastic elastomers olefinics, in particular elastomers based on propylene or ethylene or a mixture thereof; vinyl acetate (co)polymers, such as ethylene vinyl acetate copolymer; (co)polyolefins grafted with reactive maleic anhydrides, such as polyethylenes grafted with reactive maleic anhydrides; olefin(s) and acrylate(s) copolymers, such as ethylene acrylate copolymer; or a mixture thereof.

[0120] The inventors have found that these adhesive agents are compatible with (co)polyolefins, in particular polyethylenes, in an extrusion blow molding process, and promote adhesion between two underlayers comprising said adhesive agents when the extruded blow molded sheath is flattened.

[0121] In one embodiment, the ratio of the total mass of polymeric adhesive agent(s) including adhesive agent(s) C2 and / or D2, to the total mass of said plastic protective cover is greater than 0% and less than or equal to 15%, for example in the order of 10% to within + / - 3%.

[0122] Advantageously, the plastic protective tarpaulin includes few adhesive agents, the latter being arranged in the third and fourth sub-layers to glue them together.

[0123] In one embodiment, the ratio of the total mass of mineral filler(s) in said plastic protective cover to the total mass of said plastic protective cover is greater than 0% and less than or equal to 50%, preferably greater than or equal to 15% and less than or equal to 40%, in particular greater than or equal to 20%, more particularly greater than or equal to 25%.

[0124] The quantity of mineral filler(s) is optimized to give good mechanical properties to the tarpaulin with an acceptable cost price.

[0125] Advantageously, the third and fourth sub-layers do not include mineral filler(s).

[0126] In one embodiment, the ratio of the total mass of the third and fourth sub-layers to the total mass of the plastic protective tarpaulin is less than or equal to 20%, preferably less than or equal to 15%.

[0127] Preferably, the ratio of the total mass of the third and fourth sub-layers to the total mass of the plastic protective tarpaulin is greater than or equal to 5%, for example 10% to within + / - 3%.

[0128] These underlayers have the function of gluing the two folds or layers of the flattened sheath at the exit of the extrusion-blowing stage.

[0129] In one embodiment, the ratio of the total mass of the second and fifth sub-layers to the total mass of said plastic protective tarpaulin is greater than or equal to 40%, preferably greater than or equal to 50%, even more preferably greater than or equal to 55%, for example 60% to within + / - 5%.

[0130] Advantageously, the second and fifth sub-layers are the most important sub-layers in terms of mass in the protective tarpaulin and thus ensure the main mechanical functions, without including any coloring agent and / or adhesive agent.

[0131] In one embodiment, the ratio of the total mass of the first and sixth sub-layers to the total mass of the plastic protective tarpaulin is greater than or equal to 15%, preferably greater than or equal to 20%, more preferably less than or equal to 50%, more preferably less than or equal to 40%, preferably less than or equal to 35%, for example in the order of 30% to within + / - 5%.

[0132] Advantageously, these undercoats make it possible to ensure an anti-slip function on the surface to be protected on the outer surfaces of said undercoats, and possibly to assign a specific colouring function independently of the other undercoats.

[0133] In one embodiment, the plastic protective tarpaulin comprises first and second heat-bonded plastic layers, the first plastic layer comprising the first, second and third sub-layers which are co-extruded, and the second plastic layer comprising the fourth, fifth, and sixth sub-layers which are co-extruded.

[0134] Advantageously, the protective cover is an extruded-blown sheath comprising first and second layers joined together and each corresponding to a longitudinal half of the sheath.

[0135] The sheath adheres to itself without an exogenous adhesive agent by means of the adhesive agent(s) present in the third and fourth sub-layers forming the inner surface of the sheath before its flattening.

[0136] In one embodiment, the mass fractions of the different sub-layers in the plastic protective tarpaulin are: - the mass fraction of the first sub-layer is between 5% and 25%, - the mass fraction of the second sub-layer is between 20% and 40%, - the mass fraction of the third sub-layer is between 1% and 10%, - the mass fraction of the fourth sub-layer is between 1% and 10%, - the mass fraction of the fifth sub-layer is between 20% and 40%, - the mass fraction of the sixth sub-layer is between 5% and 25%.

[0137] These different mass fractions are preferred to obtain a protective tarpaulin satisfying the desired mechanical properties of tear resistance, staying in place on the surface to be protected, possible coloring of its first and second faces, and finally of the sheath gluing to itself.

[0138] In one embodiment, said plastic protective tarpaulin has a thickness greater than or equal to 200 pm, and preferably a surface mass greater than or equal to 200 g / m2.

[0139] In a preferred example, the plastic protective tarpaulin has a surface mass of 250 g / m2 at + / - 50 g / m2 and a thickness of 230 pm at + / - 50 pm.

[0140] In one embodiment, the ratio of the total mass of polyethylene(s) having a density greater than or equal to 0.900 and less than or equal to 0.950 to the total mass of said plastic protective tarpaulin is greater than or equal to 60%. According to a second aspect, the present invention relates to the use of a plastic protective tarpaulin according to any one of the embodiments referred to in the first aspect of the invention in a process for manufacturing a new plastic protective tarpaulin with a surface comprising at least 50% by mass of one or more (co)polyolefin(s), said process comprising a blow-molding step of a mixture comprising one or more plastic protective tarpaulins according to any one of the embodiments referred to in the first aspect of the invention.

[0141] The (co)polyolefin(s) may be as described in reference to the first aspect of the invention. The present invention relates, according to a third aspect, to the use of a plastic protective tarpaulin according to any of the variant embodiments with reference to the first aspect of the invention, for the protection, in particular removable, of a surface against dust and / or projections of at least one fluid.

[0142] According to a fourth aspect, the present invention relates to a method for manufacturing a plastic protective tarpaulin for a surface, in particular according to any one of the embodiments referred to in the first aspect of the invention. Advantageously, said method comprises: - an extrusion-blowing stage of a sheath comprising first and second layers, - a heat-bonding step of the said first and second layers of the sheath together, in particular said heat-bonding step includes a step of flattening the sheath, so as to form a protective plastic sheet.

[0143] Advantageously, said plastic protective tarpaulin is waterproof and has a first face and a second face, said plastic protective tarpaulin comprises one or more (co)polyolefins, the ratio of the total mass of said (co)polyolefin(s) to the total mass of said protective tarpaulin is greater than or equal to 50%, and said protective tarpaulin comprises, at least, from its first face to its second face: - said first layer comprising: - a first underlayer comprising at least one (co)polyolefin A and at least one mineral filler, and possibly at least one colouring agent; - a second underlayer comprising at least one (co)polyolefin B, and possibly at least one mineral filler, - a third underlayer comprising at least a (co)polyolefin Cl, and at least one polymeric adhesive agent C2, and said second layer comprising: - a fourth underlayer comprising at least a (co)polyolefin Dl, and at least one polymeric adhesive agent D2; - a fifth sub-layer comprising at least one (co)polyolefin E, and possibly at least one mineral filler, - a sixth sub-layer comprising at least a (co)polyolefin F and at least one mineral filler, and possibly at least one coloring agent, - and said protective tarpaulin has a thickness greater than or equal to 80 pm.

[0144] Advantageously, the thickness and thus the surface mass of the protective tarpaulin are optimized without two layers being glued together in an additional step to their extrusion manufacturing process.

[0145] Advantageously, the extrusion-blowing step includes the co-extrusion of at least three mixtures through a hollow and annular die so as to extrude a sheath (therefore implicitly hollow) comprising the three mixtures co-extruded in parallel so as to form three annular layers or three sub-layers.

[0146] Advantageously, the extrusion-blowing step includes sending air into the internal volume of the die so as to form a balloon, i.e. the extruded-blowed sheath.

[0147] Advantageously, the air is stored between the outlet head of the extruder and the distal end of the sleeve, the sleeve being flattened at its distal end.

[0148] Advantageously, the first and sixth sublayers form a first annular stratum or sublayer.

[0149] Advantageously, the second and fifth sublayers form a second annular stratum or sublayer.

[0150] Advantageously, the third and fourth sublayers form a third annular stratum or sublayer.

[0151] Advantageously, the first mixture corresponds to the first and sixth sub-layers, the second mixture corresponds to the second and fifth sub-layers, and the third mixture corresponds to the third and fourth sub-layers.

[0152] Advantageously, at the exit of the blow molding stage, the extruded-blown duct is held under tension between upper and lower zones, this stretching longitudinal flattening of the sheath so that the third and fourth sub-layers come into contact with each other and adhere to each other.

[0153] In the prior art, during the extrusion blow molding of a duct, the duct is also flattened but includes anti-blocking agents such as mineral fillers, and therefore its inner surfaces do not adhere to each other. Generally, in the prior art, the duct is cut along one or both sides to form a film whose width corresponds either to the circumference of the duct or to half the circumference.

[0154] In the present invention, it is taken advantage that, upon exiting the extrusion-blowing stage, the flattened sheath, which contains one or more polymeric adhesive agents, causes the third and fourth sub-layers to adhere to each other and are thus heat-bonded. This results in a tarpaulin comprising two films heat-bonded together. Furthermore, in the present invention, three mixtures are co-extruded, which also allows the tarpaulin to be functionalized throughout its thickness, while having a greater surface mass and therefore a greater thickness.

[0155] The extrusion blow molding process is thus known to those skilled in the art who know how to implement it. It is the particular composition of the third and fourth layers, free of mineral fillers and comprising adhesive agents, and the applied longitudinal tension, that allow the formation of the tarpaulin according to the invention.

[0156] Advantageously, at the exit of the blow extrusion step, at the distal end of the blow extruded sheath, in particular of the bubble, the first and second layers are glued together.

[0157] Advantageously, the extruded-blown sheath comprises upper and lower zones between which the longitudinal direction extends.

[0158] Advantageously, the blown extruded sheath comprises first and second edges between which the transverse direction extends, in particular substantially perpendicular to the longitudinal direction.

[0159] Advantageously, the extrusion-blowing step includes a sheath stretching step during which a stretching force is exerted on said sheath in the longitudinal direction, in particular allowing the tubular sheath to be flattened.

[0160] Advantageously, the extruded-blown duct is a tubular duct.

[0161] Advantageously, the extruded-blown sheath comprises first and second longitudinal parts arranged on either side of a longitudinal section plane P passing substantially through the center O and / or the central radial axis A of the sheath.

[0162] Advantageously, the blown extruded sheath comprises a first longitudinal half, or part, the width of which is substantially equal to half the circumference of the sheath in the blown state.

[0163] Advantageously, the blown extradite sheath comprises a second longitudinal half, or part, the width of which is substantially equal to half the circumference of the sheath in the blown state.

[0164] Advantageously, the first half comprises, or corresponds to, the first layer.

[0165] Advantageously, the second half comprises, or corresponds to, the second layer.

[0166] The variants, definitions, and embodiments with reference to the first, second, third, and fourth aspects may be combined with one another. Description of drawings

[0167] The invention will be better understood upon reading the following description of an embodiment of the invention given by way of non-limiting example, with reference to the accompanying drawings, in which:

[0168] [Fig-1] [Fig.1] is a schematic cross-sectional representation of a first example of a plastic protective tarpaulin according to the invention;

[0169] [Fig.2] [Fig.2] is a schematic side view representation of a first Example of an extruded-blown sheath before bonding between the first and second layers. Description of a method of implementation

[0170] The plastic protective tarpaulin 10 shown in cross-section in [Fig.1] comprises a first layer 20 and a second layer 30 heat-bonded along their internal faces 22 and 32.

[0171] Advantageously, the first layer 20 comprises a first sub-layer 40, a second sub-layer 50 and a third sub-layer 60, which are co-extruded together and therefore coextensive.

[0172] Advantageously, the second layer 30 comprises a fourth sub-layer 70, a fifth sub-layer 80 and a sixth sub-layer 90, which are co-extruded together and therefore coextensive.

[0173] The plastic protective tarpaulin 10 has a first face 12, corresponding to the external face 42 of the first sub-layer 40, and a second face 14 corresponding to the external face 92 of the sixth sub-layer 90.

[0174] The plastic protective tarpaulin 10 has a thickness ep extending between its first and second faces 12,14.

[0175] The plastic protective tarpaulin 10 is obtained by implementing a manufacturing process comprising a blow-extrusion step of a sheath 100, schematically and partially shown at the exit of the blow-extrusion step before bonding between the first and second layers 20, 30 in [Fig. 2]. The blow-extrusion step comprises the extrusion of three different mixtures to through a hollow cylindrical die to form said hollow sheath 100 in the form of an elongated tube whose distal and proximal ends, in particular the upper and lower zones (not shown for simplicity) of the sheath 100, are held together. Said sheath 100 has a longitudinal direction L and a transverse direction T substantially perpendicular to the direction L. Said sheath 100 is stretched and drawn in the longitudinal direction L.

[0176] The three different mixtures allow the formation of three annular sub-layers or three annular strata (110, 120, 130). Advantageously, stretching the sheath 100 between its distal and proximal ends causes the sheath 100 to flatten towards its distal end and thus brings together and then bonds the inner faces 22 and 32 respectively of the first and second layers 20, 30.

[0177] Advantageously, the first mixture thus allows the first and sixth sub-layers to be extruded (40,90), the second mixture allows the second and fifth sub-layers to be extruded (50,80), and the third mixture allows the third and fourth sub-layers to be extruded (60,70).

[0178] Advantageously, the first annular sublayer or first annular stratum 110 comprises the first and sixth sublayers (40,90) in extension of each other, and are folded towards each other in the directions of arrows Fl and F2 when the sheath 100 is flattened.

[0179] Similarly, the second annular sublayer or second annular stratum 120 comprises the second and fifth sublayers (50,80), and the third annular sublayer or third annular stratum 130 comprises the third and fourth sublayers (60,70).

[0180] The sheath 100 advantageously comprises first and second longitudinal parts (104,106) arranged on either side of a longitudinal section plane P shown in [Fig.2] and passing substantially through the center O and the central radial axis A of the tubular sheath 100.

[0181] Advantageously, the first longitudinal part 104 corresponds substantially to the first half of the sheath 100 and has a width equal to about half the circumference of the tubular sheath 100.

[0182] Advantageously, the second longitudinal part 106 corresponds substantially to the second half of the sheath 100 and has a width equal to about half the circumference of the tubular sheath 100.

[0183] In this specific example, the first sublayer 40 and the sixth sublayer 90 each have the same composition: approximately 8.25 g of low-density polyethylene, 5.25 g of calcium carbonate, and 1.5 g of titanium dioxide. Polyethylenes A and F are thus identical. The second sublayer 50 and the fifth sublayer 80 each have the same composition: approximately 21 g of low-density polyethylene density, and 9 g of calcium carbonate. Polyethylenes B and E are identical. The third sub-layer 60 and the fourth sub-layer 90 each comprise 3.75 g of low density polyethylene (polymers Cl and Dl), 1.25 g of a polymeric adhesive agent (here a thermoplastic olefinic elastomer based on polypropylene, type Vistamaax, corresponding to C2 and D2).

[0184] Advantageously, the protective tarpaulin 10 is substantially flat because it has a thickness ep that is not significant in relation to its length or width.

[0185] Advantageously, the outer faces 12, 14 of the plastic protective sheet 10 correspond to the outer faces 42, 92 of the first and sixth sub-layers (40, 90), which are colored, in this specific example, white. Titanium dioxide can be replaced by carbon black if a black color is desired. The coloring agent (TiO2) is not present in the second to fifth sub-layers (50, 60, 70, 80), which allows for optimization of its quantity.

[0186] Advantageously, the third and fourth sub-layers (60, 70) each comprise a polymeric adhesive agent (C2, D2), which allows them to bond together as they exit the blow molding die. The heat-sealing of the sleeve 100 to itself is thus advantageously achieved during the blow molding step, thereby avoiding the use of an additional adhesive external to the sheet and / or a heat-sealing step separate from the blow molding step. The resulting sheet 10 is therefore thicker and has a higher surface mass.

[0187] The protective tarpaulin 10 is advantageously recyclable because it comprises predominantly thermoplastic materials, and these are based on olefins or miscible with polyolefins in hot transformation processes, in particular extrusion blow molding.

[0188] For this specific example, the protective tarpaulin 10 has a thickness ep of approximately 230 pm and a surface mass of 250 g / m2. The tarpaulin 10 has a top breaking strength of 49.6 N + / - 1.5 N in the longitudinal direction L, and a breaking strength of 37.3 N + / - 1.70 N in the transverse direction T, a modulus of elasticity (MPa) of approximately 155 N + / - 10 N in the longitudinal and transverse directions (L,T), and an elongation at break of 300% + / - 15% in the longitudinal direction L and approximately 600% + / - 50% in the transverse direction T.

[0189] The tarpaulin 10 adheres to the surfaces to be protected without external adhesive, is flexible and thus conforms to the surfaces to be protected, and does not wrinkle. The tarpaulin 10 also exhibits good mechanical performance, including good tear resistance without the use of cardboard or textile reinforcement.

Claims

Demands

1. Plastic protective tarpaulin (10) of a surface, said tarpaulin (10) is waterproof, characterized in that said plastic protective tarpaulin (10) comprises one or more (co)polyolefins, in that the ratio of the total mass of said (co)polyolefin(s) to the total mass of said protective tarpaulin (10) is greater than or equal to 50%, in that said protective tarpaulin (10) has a first face (12,42) and a second face (14,92), and in that said protective tarpaulin (10) comprises, at least, from its first face (12) to its second face (14): - a first underlayer (40) comprising at least one (co)polyolefin A and at least one mineral filler, and optionally at least one coloring agent;- a second underlayer (50) comprising at least one (co)polyolefin B, and optionally at least one mineral filler, - a third underlayer (60) comprising at least one (co)polyolefin Cl, and optionally at least one polymeric adhesive agent C2, - a fourth underlayer (70) comprising at least one (co)polyolefin Dl, and optionally at least one adhesive agent D2; - a fifth underlayer (80) comprising at least one (co)polyolefin E, and optionally at least one mineral filler, - a sixth underlayer (90) comprising at least one (co)polyolefin F and at least one mineral filler, and optionally at least one colorant, - in that said protective tarpaulin (10) has a thickness greater than or equal to 80 pm.;

2. Plastic protective tarpaulin (10) according to claim 1, characterized in that the (co)polyolefins A, B, Cl, Dl and E are (co)polyethylenes, in particular low density (co)polyethylenes.

3. Plastic protective tarpaulin (10) according to either of claims 1 and 2, characterized in that the ratio of the total mass in (co)polyethylene(s), in particular in (co)polyethylene(s) of low density, on the total mass of said plastic protective tarpaulin (10), is greater than or equal to 50%, preferably greater than or equal to 60%.

4. Plastic protective tarpaulin (10) according to any one of claims 1 to 3, characterized in that the polymeric adhesive agent C2 and / or the polymeric adhesive agent D2 is / are selected from: olefinic thermoplastic elastomers, in particular elastomers based on propylene or ethylene or a mixture thereof; vinyl acetate (co)polymers; (co)polyolefins grafted with reactive maleic anhydrides; olefin(s) and acrylate(s) copolymers; or a mixture thereof.

5. Plastic protective tarpaulin (10) according to any one of claims 1 to 4, characterized in that the ratio of the total mass of polymeric adhesive agent(s) comprising polymeric adhesive agent(s) C2 and / or D2, to the total mass of said plastic protective tarpaulin (10) is greater than 0% and less than or equal to 15%.

6. Plastic protective tarpaulin (10) according to any one of claims 1 to 5, characterized in that the ratio of the total mass of mineral filler(s) in said plastic protective tarpaulin (10) to the total mass of said plastic protective tarpaulin (10) is greater than 0% and less than or equal to 40%, preferably greater than or equal to 15% and less than or equal to 40%.

7. Plastic protective tarpaulin (10) according to any one of claims 1 to 6, characterized in that the ratio of the total mass of the third and fourth sub-layers (60,70) to the total mass of the plastic protective tarpaulin (10) is less than or equal to 20%, preferably less than or equal to 15%.

8. Plastic protective tarpaulin (10) according to any one of claims 1 to 7, characterized in that the ratio of the total mass of the second and fifth sub-layers (50,80) to the total mass of said plastic protective tarpaulin is greater than or equal to 40%.

9. Plastic protective tarpaulin (10) according to any one of claims 1 to 8, characterized in that the ratio of the total mass of the first and sixth sub-layers (40.90) to the mass the total of the plastic protective cover (10) is greater than or equal to 20%, preferably less than or equal to 50%.

10. Plastic protective tarpaulin (10) according to any one of claims 1 to 9, characterized in that the plastic protective tarpaulin (10) comprises first and second plastic layers (20,30) heat-bonded, the first plastic layer (20) comprising the first, second and third sub-layers (40,50,60) which are co-extruded, and the second plastic layer (30) comprising the fourth, fifth, and sixth sub-layers (70,80,90) which are co-extruded.

11. Plastic protective tarpaulin (10) according to any one of claims 1 to 10, characterized in that the mass fractions of the different sub-layers (40, 50, 60, 70, 80, 90) in the plastic protective tarpaulin (10) are: - the mass fraction of the first sub-layer (40) is between 5% and 25%, - the mass fraction of the second sub-layer (50) is between 20% and 40%, - the mass fraction of the third sub-layer (60) is between 1% and 10%, - the mass fraction of the fourth sub-layer (70) is between 1% and 10%, - the mass fraction of the fifth sub-layer (80) is between 20% and 40%, - the mass fraction of the sixth sub-layer (90) is between 5% and 25%.

12. Plastic protective tarpaulin (10) according to any one of claims 1 to 11, characterized in that said plastic protective tarpaulin (10) has a thickness greater than or equal to 200 pm, and preferably a surface mass greater than or equal to 200 g / m2.

13. Plastic protective tarpaulin (10) according to any one of claims 1 to 12, characterized in that the ratio of the total mass of polyethylene(s) having a density greater than or equal to 0.900 and less than or equal to 0.950 to the total mass of said plastic protective tarpaulin (10) is greater than or equal to 60%.

14. Use of a plastic protective tarpaulin (10) according to any one of claims 1 to 13 in a method of manufacturing a new plastic protective tarpaulin (10) of a surface comprising at least 50% by mass of one or more (co)polyolefin(s), said process comprising an extrusion-blowing step of a mixture comprising one or more plastic protective tarpaulin(s) (10) according to any one of claims 1 to 13.

15. Use of a plastic protective cover (10) according to any one of claims 1 to 13 for the protection, in particular removable, of a surface against dust and / or splashes of at least one fluid.

16. A method for manufacturing a plastic protective tarpaulin (10) of a surface, in particular according to any one of claims 1 to 13, characterized in that said method comprises: - a blow-molding step of a sheath (100) comprising first and second layers (20, 30), - a heat-bonding step of said first and second layers (20, 30) of the sheath (100) to each other, in particular said heat-bonding step comprises a flattening step of the sheath (100) so as to form a plastic protective tarpaulin (10), in that said plastic protective tarpaulin (10) is waterproof and has a first face (12, 42) and a second face (14, 92), in that said plastic protective tarpaulin (10) comprises one or more (co)polyolefins, in that the ratio of the total mass of said (co)polyolefin(s) to the total mass of said protective tarpaulin (10) is greater than or equal to 50%,in that said protective tarpaulin (10) comprises, at least, from its first face (12,42) to its second face (14,92): - said first layer (20) comprising: - a first underlayer (40) comprising at least one (co)polyolefin A and at least one mineral filler, and optionally at least one coloring agent; - a second underlayer (50) comprising at least one (co)polyolefin B, and optionally at least one mineral filler, - a third underlayer (60) comprising at least one (co)polyolefin Cl, and at least one polymeric adhesive agent C2, and said second layer (30) comprising: - a fourth underlayer (70) comprising at least a (co)polyolefin Dl, and at least one polymeric adhesive agent D2; - a fifth sub-layer (80) comprising at least one (co)polyolefin E, and optionally at least one mineral filler, - a sixth sub-layer (90) comprising at least one (co)polyolefin F and at least one mineral filler, and optionally at least one coloring agent, - and in that said protective tarpaulin (10) has a thickness greater than or equal to 80 pm.

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