AU2009323984A1

AU2009323984A1 - Photoluminescent composite yarn, method for obtaining same and resulting textile structure

Info

Publication number: AU2009323984A1
Application number: AU2009323984A
Authority: AU
Inventors: Stephane Veran
Original assignee: Porcher Industries SA
Current assignee: Porcher Industries SA
Priority date: 2008-12-01
Filing date: 2009-12-01
Publication date: 2011-06-23
Also published as: WO2010063945A1; FR2939152A1; FR2939152B1; CN102232130A; EP2376687A1

Abstract

Photoluminescent composite yarn formed from a core comprising a continuous yarn, obtained by spinning fibres made of an organic or inorganic synthetic material or natural fibres, and from a polymer material formed around the core, characterized in that the outer surface of the core is of light or white colour and in that the polymer material formed around the core is transparent or translucent and contains a photoluminescent pigment.

Description

WO 2010/063945 PCT/FR2009/052361 PHOTOLUMINESCENT COMPOSITE YARN, METHOD FOR OBTAINING SAME AND RESULTING TEXTILE STRUCTURE The present invention relates to a photoluminescent 5 composite yarn for technical or industrial use, that can be assembled into any type of textile structure, especially woven fabrics and textile webs, that can be used in all applications especially in the field of signage, for example safety clothing, or for 10 decoration, for example for the manufacture of blinds or curtains. More particularly, the invention relates to photoluminescent composite yarns that can be obtained by coating. 15 The advantage of conferring photoluminescent or phosphorescent properties on a textile yarn became apparent a long time ago. Thus, US-A-2 787 558 describes a process for producing a phosphorescent yarn via incorporation of a suitable pigment (ZnS) into the 20 resin composition intended to cover the yarn. This composition comprises a binder such as casein and a polymer such as polyethylene or a polyvinyl acetate. The application to the yarn is carried out via impregnation. 25 This way of proceeding has been criticized as conferring stiffness on the yarn and on the woven fabric, a loss of textile properties and a vulnerability to abrasion. A low durability of the 30 photoluminescence properties results therefrom. In order to improve these properties, industrialists have turned towards the incorporation of luminescent pigments directly into the textile fiber: 35 US-A-2003/0122107, US-A-5 674 437 and US-A-7 338 877. Other industrialists have developed the application of photoluminescent layers to the surface of various substrates. Thus, FR-A-2 901 561 describes the WO 2010/063945 - 2 - PCT/FR2009/052361 incorporation of photoluminescent pigments into transparent or translucent substances intended for coating surfaces, including textile surfaces. It may be a photoluminescent varnish of two-component type and a 5 single-component matrix of copolymers or an acrylic PU varnish. According to this document, the choice or the color of the surface on which the matrix is applied may be taken advantage of in order to confer advantageous visual effects. The document thus envisages applying 10 colors that are white or light and/or that may be endowed with special effects of pearly or metallized type, light-reflective, or fluorescent or phosphorescent type and/or endowed with special effects obtained by surface treatment such as for example 15 anodization, metallization, laser treatment, on the base surface. The document envisages juxtaposing transparent or translucent photoluminescent and non photoluminescent layers. 20 Also known from FR 2 514 377 is a preparation based on a thermoplastic material, preferably of transparent type, such as polyvinyl chloride, and phosphorescent pigments in order to form granules and particles that can be extruded. It is especially described that the 25 core of the base yarn (without prior treatment) is subjected, via extrusion, to a thermoplastic covering based on the aforementioned preparation. The phosphorescent particle is incorporated into a very viscous molten polymer. The shear forces are higher and 30 the particle risks seeing its size reduced, which is prejudicial to the durability of the phosphorescence. Patent application US 2006/048440 relates to fishing lines, the core of which is covered with two or three 35 layers of coating. The first layer may contain polymeric microspheres that make it possible to provide lightness to the yarn. The layers may also contain fluorescent pigments. However, fluorescence is a WO 2010/063945 - 3 - PCT/FR2009/052361 phenomenon which is different from phosphorescence and this document does not make it possible to solve the problem of the durability of the fluorescence phenomenon. 5 Known from WO 03/075046 is a method for incorporating fluorescent or phosphorescent additives into a polymeric layer. The composition obtained is deposited on glass or quartz (transparent) fibers/woven fabrics. 10 Only fluorescent additives are exemplified and the durability of the phosphorescence phenomenon is not described here, however it must be weak. Known from JP09067764 is a treatment for bonding a 15 resin based on acrylic or urethane and comprising phosphor-based pigments to the surface. The coated fiber is transparent. This document does not however tackle the question of the persistence of the phosphorescence phenomenon. 20 Finally, known from JP08176924 is a nylon yarn comprising a layer of titanium dioxide and fluorescent agent. The fluorescent agent acts as an optical brightener making it possible to reinforce the 25 whiteness of the pigment (titanium dioxide) . There is no mention in this document of the persistence of the phosphorescence phenomenon. Already generally known are technical composite yarns 30 comprising: - a core comprising a continuous yarn made of an inorganic material such as glass or an organic material such as polyamide, polyvinyl alcohol or 35 polyester; and - a sheath or jacket comprising a matrix, formed of at least one polymer material, for example a WO 2010/063945 - 4 - PCT/FR2009/052361 chlorinated or acrylic polymer material, and a plasticizer. Preferably, but not exclusively, such a yarn may be 5 obtained by coating, in one or two layers, the core with a plastisol comprising the polymer material and the plasticizer, then by gelling the plastisol around the core. 10 The objective of the present invention is to overcome the drawbacks of yarns coated with a phosphorescent or photoluminescent matrix and of yarns produced from synthetic fibers containing the photoluminescent pigment. 15 The objective of the invention is especially to provide novel photoluminescent composite yarns that are easy to manufacture without requiring substantial modifications of the process for manufacturing composite yarns, 20 exhibiting good properties of textile yarns and having a lasting photoluminescence. Thus, one subject of the present invention is a continuous photoluminescent yarn obtained by spinning 25 filaments or fibers made of an organic or inorganic synthetic material or natural fibers, and of a polymer material formed around the core, characterized in that the outer surface of the core is of light or white color and in that the polymer material formed around 30 the core is transparent or translucent, preferably transparent, and contains a photoluminescent pigment. The outer surface of the core is preferably white but a light color that favors the detection of the photoluminescence may be suitable. 35 The fact of using a white or light-colored core or of producing a white or light sublayer makes it possible to reflect the light radiation. Thus, the WO 2010/063945 - 5 - PCT/FR2009/052361 phosphorescent pigment is excited in two ways, by the incident light radiation. and by the reflection of this light ray on the core of light or white color. 5 Measurement of the light or white color may be carried out by the Berger WI method (BERGER whiteness formula). The measurement of whiteness according to the Berger WI uses a standardized D65 illuminant (light source) which corresponds to the light emitted by the sun. This light 10 source is standardized and known by a person skilled in the art. The Berger index is obtained by the following formula: W = L*-0.9 Ja*2+b*) where L* corresponds to 15 the clarity and is between 0 (black) and 100 (white), a* and b* correspond to the Lab coordinates (coordinates which define the color), which are well known to a person skilled in the art, a representing the red to green axis and b representing the yellow to 20 blue axis. Thus, the present invention is characterized by a Berger WI value (Berger index) between 80 and 100. By way of comparison, formulae that do not comprise 25 pigment conferring the light or white color or that comprise a filler not conferring light or white color (for example flame-retardant filler) have whiteness values measured by the Berger WI method (Berger index) of less than 65%, respectively 80%. 30 In one embodiment, the filler or pigment conferring the light or white color has a particle size of the order of one micron, more particularly between 0.8 and 10 pm. Fillers that have a particle size such that they have 35 an opacifying effect are used. The range given is particularly suitable for this purpose. Opacity is the ability of a material to oppose the transmission of a luminous flux for a given thickness. 40 Opacity corresponds physically to the ratio between the WO 2010/063945 - 6 - PCT/FR2009/052361 measured luminosity of a layer of polymeric material applied to a black background (Y black background) and the measured luminosity of a layer of the same polymeric material on a white background (Y white 5 background), the measurements are carried out using a spectrocolorimeter. In practice, the polymeric material is coated on a black/white checked cardboard sheet. The film of thickness 1.25 mm is gelled at 1600C for 12 minutes. The reflectance Y of the coating is 10 measured using a Datacolor SF300 spectrocolorimeter on a white background and on a black background. The opacity is the ratio between the measurement of reflectance on a white background and the measurement of reflectance on a black background = Yw/Yb x 100. 15 Thus a coating with 100% opacity is completely opaque. In one embodiment, the light or white color confers an opacity on the core of between 75 and 100%. By way of comparison, formulae that do not comprise pigment 20 conferring light or white color or that comprise a filler not conferring light or white color (for example flame-retardant filler) have opacity values of less than 75% (7%, respectively 32%). 25 The amount of filler conferring a light or white color on the core is between 0.5 and 5% by weight relative to the total weight of the polymer material. According to a first embodiment, the core comprises the 30 continuous yarn and a polymer material of light or white color formed around the yarn. In this embodiment, the composite yarn is coated with at least two polymer materials, one forming a sublayer of light or white color, this sublayer being closest to the continuous 35 yarn, typically in contact therewith, the other a polymer material forming an outer layer of the composite yarn comprising the photoluminescent pigment.

WO 2010/063945 - 7 - PCT/FR2009/052361 In order to confer the properties that give the composite yarn according to the invention its ability to be handled, processed and in particular woven, it is customary to form a certain thickness of polymer 5 material around the continuous yarn. In particular it is known as the degree of uptake, or the degree of impregnation of the yarn and it is defined by the weight of coated yarn - weight of yarn following formula: x 100 weight of coated yarn 10 According to the invention, the continuous yarn is preferably coated via a coating process with the polymer materials and following the successive order of the layers, the core itself firstly being produced by coating with the aid of the polymer forming the 15 sublayer, then the polymer forming the outer layer is formed around the core via coating. According to the invention, the coating is capable of being carried out per layer with a liquid monomer or 20 polymer preparation. According to a first method, a liquid polymer preparation is obtained by melting a polymer or by dispersion, for example in plastisol form. According to a second method, a liquid monomer preparation is formed from a liquid monomer that will 25 polymerize under the effect of an energy source, such as heat or irradiation, e.g. UV irradiation. These coating processes, especially starting from a plasticized polymer and especially a dispersion of 30 plastisol type, make it possible to obtain the best degrees of uptake. Nevertheless, depending on the desired final thickness, the manufacturer is caused to apply successive layers. Thus, nothing prevents the latter from applying more than two layers or coatings. 35 Thus, an outer layer of transparent polymer material without pigment may be present, likewise a transparent intermediate polymer material without pigment may be interposed between the sublayer and the luminescent WO 2010/063945 - 8 - PCT/FR2009/052361 polymer, or else the continuous yarn may be coated or impregnated fully by a suitable polymer material. The degree of uptake of the polymer is advantageously 5 between 25 and 200. It is preferably between 50 and 100%. According to one feature, the polymer material formed around a yarn and that forms the sublayer contains a 10 pigment or pigments that confer the white (light) color. Preferably, the polymer contains a white, preferably mineral pigment such as titanium dioxide, zinc sulfide, calcium carbonate, talc or antimony trioxide. 15 Regarding this embodiment, a person skilled in the art will be able to refer to WO-A-03/056082 that describes a composite yarn coated with polymer materials. 20 As a variant, the polymer material formed around the yarn and that forms the sublayer is a foamed polymer, that is to say a polymer material comprising a foaming system that results in a layer of polymers of light or white color being obtained via the foaming effect. A 25 person skilled in the art will be able to refer to WO-A-2005/052232 which describes such a foamed polymer applied to the coating of a continuous yarn. According to a second embodiment, the core comprises a 30 continuous yarn incorporated into a mass of foamed polymer, in particular according to the teaching of WO-A-2005/052232. The constituent fibers of the continuous yarn are uniformly distributed in the polymer material matrix. The polymer is foamed by the 35 use of a chemical foaming system or of a mechanical foaming system. Typically, the core is typically prepared by coating or extrusion with or in the polymer material in combination with a process for mechanically WO 2010/063945 - 9 - PCT/FR2009/052361 opening the yarn that enables the separation of the fibers and full impregnation. The foamed polymer gives the light or white color to said core, so that it is not necessary, without however being limited thereto, 5 to provide a polymer material that forms an independent sublayer. Indeed, the trapped gas particles refract the light rays and provide a light or white color in the same way as mineral fillers. The foamed polymer material itself forms the sublayer. In this embodiment, 10 the polymer material containing the photoluminescent pigment may be applied directly to said core. According to one embodiment of the invention, the constituent material of the fibers of the continuous 15 yarn is inorganic and typically it is glass or silica. According to another embodiment of the invention, the constituent material of the fibers of the continuous yarn is organic and typically it is polyolefins, 20 polyesters, polyamides, polyvinyls or acrylics. According to another embodiment of the invention, the constituent material of the fibers of the continuous yarn is of natural origin, for example flax or cotton 25 and preferably lyocell. The expression "liquid monomer or polymer preparation" is understood to mean any liquid formulation based on monomers or polymers. 30 The term "formulation" is understood to mean any mixture comprising at least one product, for example a dispersion, solution or mixture of monomers and/or oligomers. 35 The term "polymer dispersion" is understood to mean any polymer preparation in the divided state optionally comprising additives in an organic liquid or otherwise.

WO 2010/063945 - 10 - PCT/FR2009/052361 The term "plasticized" is understood to mean a polymer containing a plasticizing agent. 5 The term "plastisol" is understood to mean a dispersion of polymers, and optionally fillers and other possible additives, in the finely divided state, in a plasticizer or plasticizing system. 10 According to one embodiment of the invention, the polymer material formed around the core is a plasticized polymer. According to one preferred embodiment, the polymer 15 material formed around the core is a plastisol. The polymer material formed around the core is preferably a transparent or translucent chlorinated or acrylic polymer. 20 As a chlorinated polymer material, it is possible to use, according to the invention, any resin capable of being plasticized, and especially one that can be employed in the form of a plastisol. 25 The term "chlorinated polymer material" is understood to mean a pure chlorinated polymer or a copolymer of vinyl chloride copolymerized with other monomers, or else a chlorinated polymer that is alloyed with other 30 polymers. Among monomers that can be copolymerized with vinyl chloride, mention may especially be made of olefins, such as for example ethylene; vinyl esters of saturated 35 carboxylic acids, such as vinyl acetate, vinyl butyrate or maleates; halogenated vinyl derivatives such as for example vinylidene chloride; and acrylic or methacrylic acid esters, such as for example butyl acrylate.

WO 2010/063945 - 11 - PCT/FR2009/052361 As chlorinated polymer, mention will, for example, be made of polyvinyl chloride (PVC), but also post chlorinated PVCs, polyvinylidene chlorides and 5 chlorinated polyolefins. Preferably, but not exclusively, the chlorinated polymer material according to the present invention has a halogen weight content of between 40 and 70%. 10 As plasticizer, mention may be made of organic phthalates, for example isononyl phthalate. As acrylic resin or material, it is possible to use any 15 synthetic polymer derived from propenoic acid that makes it possible to obtain a transparent (translucent) polymer. The acrylic resin may be a homopolymer or a copolymer 20 based on methyl methacrylate. In order to form a plasticized polymer material or a plastisol, the acrylic resin advantageously contains a plasticizer of phosphate type or of mixed 25 phosphate/phthalate type. The polymer material formed around the core comprises one or more photoluminescent pigments in an amount of 1 to 15%, more particularly of 2 to 10%, preferably of 4 30 to 6% by weight relative to the weight of the polymer material. The polymer material endowed with photoluminescent properties comprises one or more photoluminescent 35 pigments. By definition, a photoluminescent pigment is understood to mean a pigment or substance which, when it is WO 2010/063945 - 12 - PCT/FR2009/052361 excited by light radiation, especially a wavelength of radiation in the visible or ultraviolet range, emits a light that persists after cessation of the exposure to the radiation. Among these pigments, mention may be 5 made of: - zinc sulfide or calcium sulfide, optionally doped with cobalt or with copper; - rare earth sulfides; 10 - preferably rare earth silicates, rare earth aluminates and mixtures thereof; as examples, mention may especially be made of the silicates and the aluminates of europium or of dysprosium. 15 According to one embodiment, the core comprises the continuous yarn and a polymer material of white (light) color formed around the yarn and this polymer material is of the same nature as the polymer material formed around the core. 20 According to one particularly preferred embodiment, the core comprises the continuous yarn and a polymer material formed around a yarn, and also a polymer material formed around this core, and in that the two 25 polymer materials are transparent (translucent) plastisols of the same nature, typically of chlorinated polymer or of acrylic polymer. Preferably, and as is known per se, the yarn is flame 30 retarded. A flame-retardant filler may be incorporated into at least one of the polymer materials. It is possible to use known fillers. It is especially possible to use fillers that do not opacify the polymer material. Thus, according to one advantageous feature, 35 such a filler is present in the polymer forming the sublayer and in the photoluminescent polymer. As a preferred example, mention will be made of the ternary WO 2010/063945 - 13 - PCT/FR2009/052361 mixtures as described in WO-A-97/42363, or else those described in patent application FR 08 54490. The composite yarn according to the invention may be 5 incorporated into any textile structure, or assembled as any required textile structure, whether two dimensional (webs, fabrics, etc.) or three-dimensional (for example braids). 10 The composite yarn may be cut and divided into elementary yarns, intended to then be intermingled and fastened to one another, in the form of nonwoven textile structures, for example mats, or to be incorporated into such structures. The elementary yarns 15 may be fastened by impregnation with a suitable adhesive substance, or by thermal melting of the polymer material. The composite yarn may also be assembled upon itself or 2C0 with other yarns, in any suitable woven or knitted textile structure. It may be incorporated as warp yarn and/or weft yarn, or in the form of meshes formed exclusively, or not, from this composite yarn. 25 According to one preferred embodiment of the invention, the composite yarn is woven with a light-colored yarn, preferably a white yarn. The composite yarn is woven as weft or as warp, typically as weft. 30 Therefore, another subject of the present invention is a textile comprising at least one yarn according to any one of the preceding claims. This textile may be a woven fabric or a knitted fabric. 35 It may especially be a woven fabric in which the composite yarn is woven as warp or as weft, with another yarn, of light color, preferably of white color. The complementary yarn is preferably a composite WO 2010/063945 - 14 - PCT/FR2009/052361 yarn, based on continuous yarn, and on polymer material. This textile may also be a woven fabric or a knitted 5 fabric in which the composite yarn is worked as warp or as weft, in the presence or absence of a complementary yarn, preferably a composite yarn, based on continuous yarn, and on polymer material. 10 Another subject of the invention is an interior or exterior curtain or blind produced from a textile according to the invention. Another subject of the invention is a textile article 15 or an article incorporating a textile, comprising a textile according to the invention, in the field of signage or safety. The invention will now be described in greater detail 20 using embodiments or examples taken nonlimitingly. The ingredients given below may all be considered separately as examples which may be incorporated into any composition according to the invention. They should not be considered only as being an integral part of the 25 composition given as an example. A white inner polymer layer with opacifying filler may comprise the following ingredients: - PVC resin, especially in the form of a 30 microsuspension or as an emulsion, for example VINNOLITa P70; - PVC filler or extender, especially in the form of a resin in suspension, for example LACOVYL® PS1050; 35 - plasticizer, for example isononyl phthalate; - wetting agent, especially surfactant of the BYK range, for example in BYK DISPERPLASTO I; - rheological agent/diluent, for example EXXSOLS; WO 2010/063945 - 15 - PCT/FR2009/052361 - heat stabilizer, especially tin salt, thiotin, calcium-zinc compound or barium-zinc compound, for example from the BAERLOCHER range, e.g. UBZ 171; - UV stabilizer, for example from the CIBA range; 5 - flame-retardant filler, for example a mixture of antimony trioxide, zinc hydroxystannate and zinc borate; and - opacifying filler, especially zinc sulfate, titanium dioxide, calcium carbonate, for example 10 Kronos 2222. A foamed inner polymer layer may comprise the following ingredients: - PVC resin, especially in the form of a 15 microsuspension or as an emulsion, for example VINNOLIT® P70; - plasticizer, for example isononyl phthalate; - rheological agent/diluent, for example EXXSOL®; - heat stabilizer, especially tin salt, thiotin, 20 calcium-zinc compound or barium-zinc compound, for example from the BAERLOCHER range, e.g. UBZ 171; and - foaming system, for example azodicarbonamide and activator ("kicker"). 25 A photoluminescent outer polymer layer may comprise the following ingredients: - PVC resin, especially in the form of a microsuspension or as an emulsion, for example 30 VINNOLIT® P70; - PVC filler or extender, especially in the form of a resin in suspension, for example LACOVYL® PS1050; - plasticizer, for example isononyl phthalate; 35 - wetting agent, especially surfactant of the BYK range, for example in BYK DISPERPLAST® I; - rheological agent/diluent, for example EXXSOL®; WO 2010/063945 - 16 - PCT/FR2009/052361 - heat stabilizer, especially tin salt, thiotin, calcium-zinc compound or barium-zinc compound, for example from the BAERLOCHER range, e.g. UBZ 171; - UV stabilizer, for example from the CIBA range; 5 - flame-retardant filler, for example a mixture of antimony trioxide, zinc hydroxystannate and zinc borate; and - photoluminescent pigment, HONEYWELL Lumilux® Green SN F5. 10 Example: A 34 tex continuous sized glass yarn was coated using compositions as described below. The coating process 15 itself consisted of a coating over a first nozzle for the sublayer, then gelation, and over a second nozzle for the photoluminescent outer layer, then gelation, before winding. Gelation was obtained as is known per se by passage in a furnace at a suitable temperature. 20 The following formulations were produced: White inner layer with opacifying filler A: PVC resin: VINNOLITE P70 45.0 PVC extender: LACOVYLa PS1050 15.0 Plasticizer: isononyl phthalate 22.0 Wetting agent: BYK DISPERPLAST I 0.5 Rheological agent/diluent: EXXSOL 4.0 Heat stabilizer: UBZ 171 2.0 UV stabilizer: CIBA range 0.5 Flame-retardant filler: antimony trioxide, 10.0 zinc hydroxystannate, zinc borate __ Opacifying filler: titanium dioxide 1.0 25 WO 2010/063945 - 17 - PCT/FR2009/052361 Foamed inner layer B: PVC resin: VINNOLIT* P70 60 Plasticizer: isononyl phthalate 32.4 Rheological agent/diluent: EXXSOL® 1.0 Heat stabilizer: UBZ 171 5.0 Foaming system: azodicarbonamide and 1.6 activator Photoluminescent outer layer C: 5 PVC resin: VINNOLIT® P70 39.3 PVC extender: LACOVYL® PS1050 11.2 Plasticizer: isononyl phthalate 18.1 Wetting agent: BYK DISPERPLAST® I 3.0 Rheological agent/diluent: EXXSOL 4.0 Heat stabilizer: UBZ 171 4.1 UV stabilizer: CIBA range 0.6 Flame-retardant filler: antimony trioxide, 9.7 zinc hydroxystannate, zinc borate Photoluminescent pigment: SN F5 10.0 Production of a yarn with sublayer A and outer layer C, and of a yarn with foamed sublayer B and outer layer C. 1C An A + C coated yarn of 97 tex, having photoluminescence properties of long persistence was obtained. With 3.3% of photoluminescent pigment, expressed by weight relative to the total weight of the coated yarn, a persistence of 5 to 8 hours was obtained 15 after exposure of the yarn for a few minutes to UV radiation. A similar result was obtained with a B + C coated yarn of 67 tex.

Claims

1. A photoluminescent composite yarn formed of a core comprising a continuous yarn, obtained by spinning 5 fibers made of an organic or inorganic synthetic material or natural fibers, and of a polymer material formed around the core, characterized in that the outer surface of the core is of light or white color and in that the polymer material 10 formed around the core is transparent or translucent and contains a photoluminescent pigment.

2. The yarn as claimed in claim 1, characterized in 15 that the core comprises the continuous yarn and a polymer material of light or white color formed around the yarn.

3. The yarn as claimed in claim 2, characterized in 20 that the polymer material formed around the yarn contains a pigment or pigments conferring the light or white color or is a foamed polymer.

4. The yarn as claimed in claim 1, characterized in 25 that the core comprises a continuous yarn incorporated into a mass of foamed polymer.

5. The yarn as claimed in one of the preceding claims, characterized in that the organic or 30 inorganic synthetic material constituting the fibers of the yarn is chosen from the group formed by glass, silica, polyolefins, polyesters, polyamides, polyvinyls, acrylics, flax and cotton. 35

6. The yarn as claimed in one of the preceding claims, characterized in that the polymer material formed around the core is a chlorinated or acrylic polymer. WO 2010/063945 - 19 - PCT/FR2009/052361

7. The yarn as claimed in the preceding claim, characterized in that the chlorinated polymer is chosen from polyvinyl chloride (PVC), post 5 chlorinated PVCs, polyvinylidene chlorides and chlorinated polyolefins.

8. The yarn as claimed in the preceding claim, characterized in that the acrylic polymer is a 10 homopolymer or copolymer based on methyl methacrylate.

9. The yarn as claimed in any one of claims 6 to 8, characterized in that the polymer material is a 15 plasticized polymer.

10. The yarn as claimed in claim 9, characterized in that the polymer material is a plastisol. 20

11. The yarn as claimed in any one of claims 5 to 10, characterized in that the core comprises the continuous yarn and a polymer material of white color formed around the yarn and in that this polymer material is of the same nature as the 25 polymer material formed around the core.

12. The yarn as claimed in claim 11, characterized in that the core comprises the continuous yarn and a polymer material formed around the yarn, and also 30 a polymer material formed around this core, and in that the two polymer materials are transparent or translucent chlorinated polymer or acrylic plastisols, comprising, for the first, a pigment conferring a light or white color and, for the 35 second, a photoluminescent pigment.

13. The yarn as claimed in any one of the preceding claims, characterized in that the polymer material WO 2010/063945 - 20 - PCT/FR2009/052361 formed around the core comprises one or more photoluminescent pigments in an amount of 1 to 15% by weight relative to the weight of the polymer material. 5

14. The yarn as claimed in any one of the preceding claims, characterized in that the photoluminescent polymer comprises a photoluminescent pigment chosen from rare earth silicates, rare earth 10 aluminates, and mixtures thereof.

15. The yarn as claimed in any one of the preceding claims, characterized in that the polymer formed around the core is a transparent PVC or acrylic 15 plastisol.

16. The yarn as claimed in any one of the preceding claims, characterized in that the polymer material formed around the core and/or the yarn is obtained 20 by coating.

17. The yarn as claimed in any one of the preceding claims, characterized in that the degree of polymer uptake is between 25 and 200%, preferably 25 between 50 and 100%.

18. A textile structure, preferably woven fabric, comprising at least one yarn as claimed in any one of the preceding claims. 30

19. An article comprising a textile structure as claimed in claim 18, characterized in that the article is a blind, a curtain or a signage or safety article.