894results about "Flame-proof filament manufacture" patented technology

The invention relates a nylon 6 polymerization method and a direct spinning method of a melt of a polymer obtained with the nylon 6 polymerization method. A polyamide 6 prepolymer is prepared at the low temperature, the content of oligomers in the melt is controlled in advance, polymerization is completed before a large quantity of cyclic oligomers are generated with a condensation polymerization dynamic strengthening method, a nylon 6 polymer melt with certain molecular weight is acquired, the content of extracts in the product is smaller than or equal to 1.5 wt%, and the content of cyclic dipolymers is smaller than or equal to 0.2wt%; then, direct melt spinning forming is performed after condensation polymerization dynamic strengthening ends. The process is simple, energy consumption is further reduced while the utilization rate of caprolactam is increased, the obtained melt can be directly used for melt spinning, high-capacity large-scale production is easy to realize, a modifier can be added in the polymerization process, flexible production of nylon 6 is realized, and the nylon 6 can be applied to fibers for clothes, industrial filaments, engineering plastics and other fields.

The invention provides carpet fibers prepared from a blend of polymeric components, said fiber exhibiting improved properties, such as improved spinnability and improved fire resistance. The carpet fibers particularly comprise a majority of polytrimethylene terephthalate (PTT) and a minority of polyethylene terephthalate (PET). The invention further provides yarns and carpets prepared from the inventive fibers, said yarns and carpets likewise exhibiting improved properties. The invention also provides methods of improving various physical properties (such as fire resistance, spinnability, and elongation) of a polymeric composition.

A flame-retarding copolymerized terylene chip is prepared on the basis of ordinary preparing process of terylene chip and is characterized by that after the esterifying step in the process to prepare polyester is finished, the flame-retarding agent, which is prepared from 2-carboxyethyl phenylphosphoric acid through dissolving it in ethylene glycol (EG), is added. Its advantages are high and durable flame-retarding effect, no toxicity and high spinnability.

A flame-retardant synthetic resin composition characterized by comprising 1-40 parts by weight of at least one type of organic phosphorus compound represented by the following general formula (1):

(wherein R¹ represents alkyl, aralkyl, etc.)

with respect to 100 parts by weight of a synthetic resin.

The invention relates to a multi-purpose sheath-core composite monofilament for weaving reticulated as well as a production method and application thereof, and belongs to the technical field of production of composite fibers. The multi-purpose sheath-core composite monofilament comprises a sheath layer and a core layer, wherein the sheath layer covers the core layer; the core layer is prepared from PP, TPU or TPEE; the sheath layer is prepared from PE, POE, TPU or TPEE; the melting point of the sheath layer is 120 to 170 DEG C; the melting point of the core layer is 150 to 210 DEG C; the content of the sheath layer is 30 to 70 percent; the content of the core layer is 70 to 30 percent. The multi-purpose sheath-core composite monofilament comprising two components can be applied to weaving of gauze, window screens, curtains, abat vents, light equalization cloth, anti-mosquito nets, anti-haze gauze, filter screen cloth, shoe screen cloth, and base materials of power transmission belts.

The invention provides a polyamide 56 material prepared from bio-based 1,5-pentamethylene diamine. The polyamide 56 material is renewable and has the high flame-retardant property. The polyamide 56 material comprises polyamide 56 and a composition of nitrogen-containing flame retardants or is a polymer formed by pentamethylene diamine, adipic acid and nitrogen-containing flame retardants serving as a polymeric monomer. The material is good in flame-retardant effect, low in toxicity, high in safety, low in cost and capable of being used as engineering plastics and a spinning material. According to the material, the preparation process is simple and convenient, and wide industrial application prospects are achieved.

The invention relates to a method for preparing a polyester filament, in particular to a method for preparing a colorized fire-retardant delustering hollow polyester filament. The method mainly solves the technical problem of the prior art that color master batches and a delustering agent added into a fire-retardant slice can influence the viscosity of a fused mass during the spinning and the friction to a device in the processing process so that colorized, fire-retardant and delustering finished polyester fiber and the like cannot be prepared. The preparation method comprises the following steps: adding a copolymerization fire retardant in the process of preparing a polyester slice to form the fire-retardant slice; performing pre-crystallization on and drying the fire-retardant slice, the color master batches and delustering master batches, and evaporating the water content; mixing the fire-retardant slice with the color master batches and the delustering master batches, passing the mixture into a double screw extruder to perform heating melting, performing filter mixing and measuring allocation on the fused mass, and spinning the fused mass into tows; and performing cooling molding on the tows through lateral blow, and obtaining a finished product after oil tanker oiling, drafting, networking and winding.

The invention discloses a anti-melting flameretardant fiber and preparation method thereof. The flame-retardant is added in the dissolving procedure to using production method of viscose fiber, and then processed by mixing, filtration, ripening, debubbling, spinning, refinning, drying, and finished product to produce flameretardant fiber. When burning, the said anti-melting flameretardant fiber will not melt but only carbonize to keeping the original shape of fibre, therefore it prevent high temperature melting drip scalding the people. Furthermore the flame-retardant homogeneously disperses in viscose, and does not smolders and is easy to self extinguish after leaving fire source. The said preparation method is simple and easily operated. The flame retardant property is good, and the disperse of flame-retardant is homogeneous.

The invention discloses a preparation method of halogen-free flame retardant high-intensity polyvinyl alcohol fibers, which is characterized by comprising the following steps of uniformly mixing 20-45 parts by weight of phosphate ester flame retardant powder with the average particle size no more than 1.0 microns, 1-10 parts by weight of dispersing agent, and 40-79 parts by weight of water to prepare flame retardant suspended slurry, continuously mixing the slurry and polyvinyl alcohol plus boron spinning solution with the polymerization degree of 1700-3000 and the alcoholysis degree more than 99 percent through a mode of spun injection, carrying out spinning with the mixed solution through a polyvinyl alcohol wet method plus a spinning process route, carrying out neutralization, wet-heat drawing, washing and drying on solidified fibers to obtain as-spun fibers, preheating the as-spun fibers to the temperature of 200-230 DEG C, drawing by 2-4 times, and then carrying out heat setting on the fibers at the temperature of 180-210 DEG C for 2-5min to obtain the halogen-free flame retardant high-intensity polyvinyl alcohol fibers. According to different uses, post-treatment steps such as formalization, oiling, curling, cutting and the like can be selectively carried out on the flame-retardant fibers. The flame-retardant fibers prepared through the method has the advantages of low toxicity and high intensity, realizes self-extinguishment after leaving fire, is free of halogen and the dripping phenomenon and is used for aspects of fabric flame retarding, enhancing flame retardant fabrics and the like, and the limited oxygen index can reach 28-30.

The invention discloses a method for producing melamine formaldehyde resin/polyvinyl alcohol flameproof fiber. The invention is characterized in that composing melamine and formaldehyde at the mole ratio as 1:1.2-1:6 and 50-100Deg. C into melamine formaldehyde resin water solution, to be mixed with the polyvinyl alcohol water solution at the solid content ratio as 2:8-8:2 to obtain spinning original liquid, then spinning and shaping the original liquid via general wet method, and treating solidifying bath via acid sodium sulfate saturated water solution, and the primary fiber is drawn, shaped via wet and heat method, washed, coiled, oiled, dried, and heated in dry condition to obtain the final melamine formaldehyde resin/polyvinyl alcohol flameproof fiber. The titer of said flameproof fiber is 10detex, while the strength is 1-3cN/dtex, the crack extended rate is 5-15%, the regain ratio is 5-10%, and the limit oxygen index is 30-45.

The invention discloses a preparation method of a superfine fiber polyurethane leather base cloth based on a conventional process, and in the step of spinning, FR-535 flame retardant nylon master batches are added to perform fire retardant treatment on superfine fibers. The invention also discloses the superfine fiber polyurethane leather base cloth prepared by the method, a preparation method of superfine fiber polyurethane leather, the superfine fiber polyurethane leather prepared by the method and an application of the method in preparing leather for automobile trim. The method in the invention can enable the superfine fiber polyurethane leather base cloth and the synthetic leather to have excellent flame retardant property with the horizontal burning time of 3min and damaged length of no more than 81mm. In addition, the superfine fiber synthetic leather has excellent combination property, such as light resistance, favorable fastness, high wear resistance and the like, delicate color, has the physical properties capable of comparing favorably with natural cow leather, and can satisfy the requirement of leather in automobile trim.

The invention relates to a modified polypropylene fiber and a preparation method thereof. The invention is characterized in that the fiber has a skin-core structure, wherein the core layer is composed of pure polypropylene; and the skin layer is composed of 0.5-60 parts of functional material, 0-5 parts of compatilizer and the balance of polypropylene, totaling 100 parts. The viscosity-average molecular weight of the polypropylene is 0.18-0.3 million, and the degree of isotacticity is greater than 95%. The functional material is a functional polypropylene fiber master batch prepared by blending and granulating inorganic or organic functional micropowder, a compatilizer and polypropylene, wherein the functional micropowder is composed of one or more of nano silicon dioxide, nano titanium dioxide, nano silicon dioxide, an anti-mite agent and an N-substituted alkoxy hindered amine flame retardant. The polypropylene fiber can be subjected to skin-core conjugate spinning according to the skin-core formula, and can be further processed into a polypropylene fiber spunbonded nonwoven fabric or melt-blown nonwoven fabric by spunbonding or melt-blowing. The method has the advantages of simple production technique and small modification for equipment, and is easy for practical popularization and application.

The invention discloses a graphene/nylon 6 fiber with flame-retarding and ultraviolet-proof properties and a preparation method of the graphene/nylon 6 fiber and belongs to the technical field of functional high molecular materials. The graphene/nylon 6 fiber with the flame-retarding and ultraviolet-proof properties is prepared through high-speed melting spinning of a graphene/nylon 6 nano composite material; the graphene/nylon 6 nano composite material is prepared by compounding modified graphene, caprolactam and various auxiliary agents. The graphene/nylon 6 nano composite material obtained by the invention can continuously pass through a melting spinning hole at a high speed and continuous high-speed spinning is realized; the diameter of the fiber is 5mum to 50mum; compared with a pure nylon 6 fiber, the prepared graphene modified nylon 6 fiber has excellent flame-retarding, melt-dripping-resisting and ultraviolet-proof performances and the like.

The invention discloses a P-based polyester fire-retardant fiber which comprises a fiber body containing polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate or cation-modified polyethylene terephthalate. The fiber body further contains a P-based fire retardant selected from 2-carboxyethylphenyl phosphoric acid, 2-carboxyethyl methylphosphonate or 2-carboxyethyl methylphosphoric acid. The production process of the fiber comprises mixing polyesters for forming the fiber body with the P-based fire retardant, performing melt-spinning to obtain fire-retardant fiber precursor, subjecting to winding, stretching and netting processes to make fire-retardant polyester long filament (that is P-based polyester fire-retardant fiber). The inventive fire-retardant fiber has the similar physical property to the common polyester fiber and is superior in good spinning property and excellent fire-retarding effect.

The invention relates to a flame-resistant and uvioresistant polyester composite material and a method for preparing the same. The composite material is prepared by performing an esterification reaction on ethylene glycol, terephthalic acid, uvioresistant agent pulp and a flame retardant and then performing low-vacuum condensation polymerization and high-vacuum condensation polymerization, wherein the added amounts of the uvioresistant agent pulp and the flame retardant are between 0.1 and 20 weight percent and between 0.1 and 20 weight percent respectively; the esterification reaction is performed at the temperature of between 200 and 290 DEG C and under a pressure of between 0.1 and 0.6 MPa for 1 to 4 hours; the low-vacuum condensation polymerization is performed at the temperature of between 200 and 290 DEG C and under the pressure of between 100,000 and 500 Pa for 10 to 90 minutes; the high-vacuum condensation polymerization is performed at the temperature of between 250 and 300 DEG C and under the pressure of between 500 and 50 Pa for 1 to 4 hours; and the uvioresistant agent pulp consists of 5 to 30 weight percent of inorganic nano-oxide and the ethylene glycol. Flame-resistant and uvioresistant polyester fiber fabrics prepared from the material have flame resistance and uvioresistant effect.

A yarn, fabric, and garment suitable for use in arc and flame protection comprising aramid fiber and modacrylic fiber wherein the modacrylic fiber has less than 1.5 percent antimony and is preferably antimony-free. In one embodiment, the yarn, fabric, and/or garments consist essentially of (a) 50 to 80 weight percent meta-aramid fiber having a degree of crystallinity of at least 20%, (b) 10 to 40 weight percent modacrylic fiber that is antimony-free, (c) 5 to 20 weight percent para-aramid fiber, and (d) 1 to 3 weight percent antistatic fiber, based on the total weight of components (a), (b), (c) and (d). In some embodiments, garments made from the yarns provide thermal protection such that a wearer would experience less than a 65 percent predicted body burn when exposed to a flash fire exposure of 4 seconds per ASTM F1930, while maintaining a Category 2 arc rating per ASTM F1959 and NFPA 70E.

The invention discloses a blending fireproof terylene industrial filament and the production method thereof. The blending fireproof terylene industrial filament contains a flame retardant master batch. The flame retardant master batch and a terylene master batch are prepared by the weight percentages as follows: polyethylene terephthalate 90-95% and inorganic flame retardant master batch 5.0-10.0%. The production method includes processes of solid phase polymerization, spinning, drafting shrink-setting. Through selecting reasonable blending modifier as well as reasonable technological process and technological parameter, the product of the invention has good permanent flame retardant property and keeps high strength and high modulus required by the industrial filament, thereby being widely used in preparing interior decoration materials, the paver for vehicles, cars, ships and so on, industrial hoisting, covering materials, military supplies, mine used conveying belt, etc.

The invention provides an application of polyamide 5X as a flame-retardant material. When taken as the flame-retardant material, polyamide 5X has a good flame-retardant effect, is safe to the environment, safe in physiology and compatible with various high-polymer textile materials, cannot damage attractiveness and texture characteristics of textile, and is resistant to repeated washing and cleaning. When taken as the flame-retardant material, polyamide 5X has flame retardance which cannot be reduced with increase of the washing times, and belongs to a permanent flame-retardant type.

The invention relates to a permanent antistatic flame-retardant polyamide-6 bulked continuous filament textured carpet yarn and a preparation method. The permanent antistatic flame-retardant polyamide-6 bulked continuous filament textured carpet yarn comprises a carpet yarn body, wherein the carpet yarn body consists of two tows of flame-retardant polyamide-6 bulked continuous filaments in different colors or the same color and a tow of antistatic polyamide-6 bulked continuous filaments; single fibers in the three tows of polyamide-6 bulked continuous filaments are random three-dimensional crimped fibers; different types of fibers are randomly mixed and intertwined; and periodical net knots are arranged on the surface of the carpet yarn body. The preparation method is implemented by one step through a tri-screw bulked continuous filament (BCF) spinning machine set. The product substantially maintains the characteristics of abrasion resistance, stain resistance, resilience and the like of polyamide-6, and also has a permanent antistatic function and a flame-retardant function. According to the preparation method, the characteristics of a production process of the tri-screw BCF spinning machine set are utilized, so that the aim of spinning the antistatic flame-retardant polyamide-6 textured carpet yarn by one step is fulfilled, and the production process is simple, practical and efficient.

The invention relates to a flame retardant polyester fiber preparation method. Pure terephthalic acid, ethylene glycol and phenyl-(ethylene glycol propionate) phosphinic acid are used for the esterification under the positive pressure and for the polycondensation, the belt casting and the granulation under the negative pressure to obtain fire retardant polyester slices. The phenyl-(ethylene glycol propionate) phosphinic acid is phosphor series fire retardant. The content of phosphor in the slices is controlled to be 0.5 to 1 percent. The fire retardant polyester slices are put in a vacuum drum dryer. The dried slices are put on a spinning machine for the spinning to obtain the fire retardant polyester fiber. The fire retardant property is stable. No free flame retardant agent monomer exists. The utilization rate of the fire retardant is improved. The corrosion, toxic gas and the smoke releasing amount of the polyester fiber and the textile are lowered. The production technological process is simplified at the same time. The used raw material categories are reduced. The production cost of the fire retardant polyester fiber is reduced. The oxygen index is 32 to 34 percent.

The invention relates to a preparation method of highly-spinnable halogen-free flame-retardant nylon fibers, which comprises the following steps: performing blending and granulation of nylon slices, cyclic phosphates, melamine compounds, nanometer inorganic substances, and antioxidants in a double screw extruder to obtain a halogen-free flame-retardant nylon master batch, spinning the halogen-free flame-retardant nylon master batch with nylon slices into halogen-free flame-retardant nylon fibers through a melt spinning method. Compared with the prior art, the invention improves the dispersibility of the fire retardants and the compatibility of the polymers, and thus the product has good flame retardance; the spinnability of the nylon fibers is improved to a great extent; the invention has low cost, is industrialized; both halogen-free flame-retardant nylon aircraft seat covers and aviation carpet lines spun by the method of the invention pass FAR 25.853 cabin internal material flammability tests.

The invention relates to the use of polyphosphonates, copoly(phosphonate ester)s, copoly(phosphonate carbonate)s, and their respective oligomers, as flame retardant additives for polyester fibers to impart fire resistance while maintaining or improving processing characteristics for melt spinning fibers.

The invention discloses a flame-retardant antibacterial artificial wig hairline, which comprises, by weight, 80-90% of a polyester material, 5-11% of a flame retardant agent, 2.5-6% of an antibacterial agent, 0.3-3% of a dispersing agent, 0.2-0.5% of an antioxidant, and 2-5% of color masterbatch. According to the present invention, the flame-retardant antibacterial artificial wig hairline has characteristics of high simulation degree, flexible hairline, diverse color, flame retardant property, antibacterial property, no fused drop, environmental protection and the like, and can replace the expensive human hairline. The invention further discloses a manufacturing method of the flame-retardant antibacterial artificial wig hairline, wherein the manufacturing method comprises: pre-treating a polyester raw material, carrying out blending granulation on the polyester material, the antibacterial agent, the flame retardant agent, the dispersing agent and the stabilizer by using a double-screw extruder to obtain a flame-retardant antibacterial slice, carrying out melt spinning on the slice, carrying out high-temperature shaping treatment, carrying out washing and drying, and carrying out other steps.

The invention relates to an antiflaming viscose fiber and a preparation method thereof, and belongs to the technical field of viscose fiber production. The antiflaming viscose fiber comprises an antiflaming solution and a spinning viscose solution, wherein in the antiflaming solution, a concentration of sodium hydroxide is 40-70g/L; a concentration of a linear silicon flame retardant is 180-225g/L; a concentration of an auxiliary flame retardant is 80-120g/L; a concentration of a silane coupling agent is 70-110g/L; and a concentration of a thickening agent is 15-25g/L. According to the antiflaming viscose fiber and the preparation method, a situation that an alkali concentration in an antiflaming viscose spinning solution is reduced finally is avoided to the greatest extent, so that the spinnability of the antiflaming viscose spinning solution is improved, and the quality of the antiflaming viscose fiber is further improved. In addition, the thickening agent is added, and a viscidity change of viscose before spinning is reduced, so that the spinnability of the antiflaming viscose glue spinning solution is also improved, and the quality of the antiflaming viscose fiber is further improved.

The invention relates to a non-woven sound absorbing material and in particular relates to an activated carbon-EVA composite emulsion coated polypropylene-based non-woven sound absorbing material for automobile interior decoration. The material is prepared from the following raw materials in parts by weight: 20-24 parts of polypropylene, 10-14 parts of polyurethane, 0.2-0.3 part of an antioxidant DLTP, 5-8 parts of mineral cotton fibers, 0.5-0.8 part of activated carbon micro powder with the granularity being 400-600 meshes, 1-2 parts of rosin, 1-2 parts of silicone oil, 14-18 parts of tetrapod-like zinc oxide whiskers, 0.1-0.2 part of ammonium polyphosphate, 10-12 parts of EVA emulsion with the solid content being 10-12 percent and 1-2 parts of aids. The surface of fiber yarns formed by performing melt-blowing on modified polypropylene-based master batch is coated by the EVA composite emulsion, the prepared material has the advantages of the traditional polypropylene non-woven material, the mechanical property is improved, the scour and wear resistance, fiber yarn strength and specific surface area are improved, the sound absorption and noise reduction effects are obvious, the odor in an automobile can be eliminated, and the material is fireproof, flame-retardant, light, environmentally friendly, tough and tight and is a novel and practical sound absorbing material for vehicles.

The invention discloses a preparation method of melt-drip resistant inflaming retarding polyester fiber, comprising the following steps: mixing melt-drip resistant agent with a polyester slice, performing melt spanning, and processing and post-processing the mixture by alkaline solution and acid solution to form the melt-drip resistant inflaming retarding polyester fiber. The limited oxygen index of the melt-drip resistant inflaming retarding polyester fiber of the invention is 31-34, thereby melt dripping can not occur when the melt-drip resistant inflaming retarding polyester fiber burn, which can resist melt dripping effectively without releasing poisonous gas or smoke. Spinning melt-drip resistant inflaming retarding polyester fiber in accordance with routine melt spinning technology of the polyester fiber, the spanning is simple and easy to operate. The melt-drip resistant inflaming retarding polyester fiber can be directly and widely used as coatings, curtains, bedding articles, interior decoration and various special materials and the like, and has significant economic benefit and social benefit.

The invention relates to a preparation method of polyester staple fiber, and in particular relates to a preparation method of anti-flaming recyle polyester staple fiber. The method comprises the following steps of: preparing phosphorus series halogen-free anti-flaming master batches; weighing the phosphorus series halogen-free anti-flaming master batches and recyle polyester raw materials according to parts by weight, and respectively drying; transporting the dried recyle polyester raw material to a liquid phase quality and viscosity adjusting reaction kettle by a melt pump after the recyle polyester raw material is melted and filtered; transporting polyester melt after liquid phase tackifying to a second stage filter by the melt pump, mixing with the phosphorus system halogen-free anti-flaming master batch melt in the second stage filter, and enabling the mixed melt to enter a spinning manifold through a static mixer arranged on a transporting pipeline to spin; and carrying out post processing on the obtained as-spun fiber, and cutting off and packing the tows. The preparation method of the permanent and regenerative anti-flaming polyester fiber provided by the invention is high in operability, reasonable in technology, high in production efficiency, and capable of realizing large-scale production.

The invention relates to a process for producing a fire-retardant high-tenacity terylene yarn, which comprises the following steps: reforming equipment by using the prior industrial terylene yarn production line; adopting two sets of solid phase thickening devices; preparing high-viscosity polyester slices and high-viscosity fire-retardant master batches respectively, and thickening the high-viscosity polyester slices and the high-viscosity fire-retardant master batches, wherein the high-viscosity fire-retardant master batches are metered precisely according to certain proportion through a master batch adding machine and are mixed with the high-viscosity polyester slices, the optimal proportion of the two materials is controlled to be 12:88, so that the fire resistance and the tenacity are greatly improved; processing the two materials by a pin screw extruder, a meter and a spinneret plate; after slow cooling, lateral blowing and oiling, performing multi-stage hot-rolling stretching; and finally winding the two materials into spinning cakes on a winder. The process has the characteristics of simplicity, easy operation, high product tenacity, good fire resistance and the like.

The invention relates to a cool flame-retardant recycled polyester filament fiber and a production method thereof. The filament fiber is of a skin-core structure, a skin layer is obtained by melt spinning of cool master batch and a recycled polyester chip, and the addition amount of the cool master batch is 5wt%-10wt%; a core layer is obtained by melt spinning of flame-retardant master batch and a recycled polyester chip, and the addition amount of the flame-retardant master batch is 20wt%-30wt%; the cool master batch is obtained by blending granulation of cool powder and a recycled polyester chip in the mass ratio of (15%-25%) to (85%-75%); the cool powder is obtained by mixing of flaky jade, zinc oxide and titanium dioxide in the mass ratio of (50%-60%) to (10%-20%) to (40%-20%); the flame-retardant master batch is obtained by blending granulation of a flame retardant and a recycled polyester chip in the mass ratio of (25%-35%) to (75%-65%); the flame retardant is one or more of melamine, melamine cyanurate, triphenyl phosphate and polysulfonyldiphenylene phenyl phosphonate. The cool flame-retardant recycled polyester filament fiber has a cool property and a flame-retardant property and the spinnability and the functionality of the fiber are guaranteed at the same time.

The flame-retardant polymer fibre according to the invention comprises a PA66/PA6 polymer blend having the following composition: 60 to 90% by weight of polyamide 66, 6 to 25% by weight of polyamide 6, 4 to 10% by weight of at least one halogen-free flame retardant made of a polycondensate of a) at least one phosphorus-containing monomer selected from adducts of a1) 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and/or nuclear-substitution DOPO derivatives in a2) unsaturated compounds from the group of mono- and multivalent carboxylic acids and the anhydrides thereof and b) at least one ester-forming monomer selected from the group of mono- or multivalent alcohols and mixtures thereof. In addition to the flammability resistance, the polymer fibre according to the invention has very good textile-mechanical properties, and is resistant to washing-out of the flame retardant.