WO2008110539A1

WO2008110539A1 - Fiber composite

Info

Publication number: WO2008110539A1
Application number: PCT/EP2008/052836
Authority: WO
Inventors: Martin Weber; H. Schuermann; Martin Fleischhauer
Original assignee: Basf Se
Priority date: 2007-03-13
Filing date: 2008-03-11
Publication date: 2008-09-18

Abstract

The present invention relates to fiber composites, comprising 15 to 95 wt.%, in relation to the weight of the fiber composite, of a thermoplastic matrix M, comprising A) 0 to 99 wt.%, in relation to the weight of the thermoplastic matrix M, of a styrene-acrylonitrile copolymer and/or of an α-methylstyrene-acrylionitrile copolymer as component A, B) 1 to 100 wt.%, in relation to the weight of the thermoplastic matrix M, of a styrene-acrylionitrile-maleic acid anhydride copolymer as component B, C) 0 to 50 wt.%, in relation to the weight of the thermoplastic matrix M, of a rubber-elastic polymer as component C, and D) 0 to 50 wt. %, in relation to the weight of the thermoplastic matrix M, of usual plastic additives as component D. The sum of the components A, B, C, and D equals 100 wt.%, and 5 to 85 wt. %, in relation to the weight of the fiber composite, of glass fibers G, wherein the sum of the thermoplastic matrix M and the glass fibers G equals 100 wt.%. The viscosity number VZ of the mixture of the components A and B (measured according to DIN 53727 at 25°C as 0.5 wt.% solution in dimethylformamide) is equal or smaller than 85 ml/g. The length of the glass fibers G is equal or greater than 50 mm. The invention further relates to a method for the production of fiber composites and fiber composite components produced with fiber composites.

Description

Fiber composite material

description

The present invention relates to fiber composites containing

15 to 95 wt .-%, based on the weight of the fiber composite material, a thermoplastic matrix M comprising

A) 0 to 99% by weight, based on the weight of the thermoplastic matrix M, of a styrene-acrylonitrile copolymer and / or of an α-methylstyrene-acrylonitrile copolymer as component A,

B) 1 to 100% by weight, based on the weight of the thermoplastic matrix M, of a styrene-acrylonitrile-maleic anhydride copolymer and / or of an α-

Methylstyrene-acrylonitrile-maleic anhydride copolymers as component B,

C) 0 to 50 wt .-%, based on the weight of the thermoplastic matrix M, of a rubbery elastomeric polymer as component C, and

D) 0 to 50% by weight, based on the weight of the thermoplastic matrix M, of plastics-compatible additives as component D,

wherein the sum of the components A, B, C and D gives 100 wt .-%, and

From 5 to 85% by weight, based on the weight of the fiber composite, of glass fibers G,

wherein the sum of the thermoplastic matrix M and the glass fibers G gives 100% by weight,

and methods of making fiber composite materials and fiber composite components made from fiber composites.

Fibrous composites with a thermoplastic matrix, for example in the automotive sector, already find numerous applications. Currently the most commonly used thermoplastic matrix system in terms of quantity is polypropylene. Due to the thermomechanical properties of polypropylene which are not sufficiently good in all fields of application, however, such composites are only of limited suitability for thermally and mechanically highly loaded structural components. Fiber-reinforced plastic matrices based on other polymers are also known and described in the literature, for example thermoplastic mixtures with short glass fibers (see, for example, RN Rothon, Particulate Fillers for Polymers, Vol. 12, 2002, Rapra Reports).

From DE-A1 35 15 867 reinforced molding compositions were known, which in addition styrene copolymers, in particular styrene-acrylonitrile copolymers, a terpolymer having functional groups. The fiber length in the reinforced molding compositions can vary widely, from less than 1 mm to continuous fibers; preferred fiber lengths are 6 cm or less. For the production of fiber composites, such matrices often have too high a melt viscosity.

In "M. Fleischhauer, H. Schürmann, Qualification and Testing of a Thermoplastic Matrix System for Structural Components in Traffic Engineering, Proceeding 1 1, National Symposium SAMPE Germany eV 2005", various glass fiber reinforced thermoplastic matrices, i.a. also a ggü. other matrix materials comparatively temperature-resistant and inexpensive styrene-acrylonitrile copolymer matrix, examined with regard to their mechanical strength. It is concluded that styrene-acrylonitrile copolymers, because of their low shear strength, are not suitable for the production of structural components exposed to high shear stresses, but that this problem may possibly be solved by a sizing specially adapted to SAN (Section 3.4.4., P. 14, last paragraph).

The object of the present invention is to provide fiber composites which are based on a comparatively temperature-resistant and cost-effective styrene-acrylonitrile copolymer matrix and are compared with the prior art. known fiber composites under elevated temperatures, for example 80 ⁰ C, an improved shear strength, in particular an improved transverse longitudinal shear strength, have.

Accordingly, the above-mentioned fiber composites were found, wherein it is essential that the thermoplastic matrix M comprises a copolymer containing maleic anhydride as a monomer component, the viscosity number VZ of the mixture of components A and B (measured according to DIN 53727 at 25 ° C than 0.5 wt. -% solution in dimethylformamide) is equal to or less than 85 ml / g and the length of the glass fibers G is equal to or greater than 50 mm.

Furthermore, methods for producing these fiber composites were found, as well as fiber composite components, produced from these fiber composites.

The fiber composites according to the invention are based on a comparatively temperature-resistant and inexpensive styrene-acrylonitrile copolymer matrix and sen ggü. known fiber composites under elevated temperatures, for example 80 ⁰ C, an improved shear strength, in particular an improved transverse longitudinal shear strength on.

The fiber composite materials according to the invention and the other methods and articles according to the invention are described below.

The fiber composites of the invention contain 15 to 95 wt .-%, preferably 20 to 90 wt .-%, particularly preferably 25 to 70 wt .-%, of the thermoplastic matrix M and 5 to 85 wt .-%, preferably 10 to 80 wt. -%, particularly preferably 30 to 75 wt .-%, glass fibers G, wherein the wt .-% of the matrix M and the glass fibers G respectively based on the weight of the fiber composite material and together 100 wt .-% result.

The thermoplastic matrix M of the fiber composite materials according to the invention comprises

A) 0 to 99 wt .-%, preferably 45 to 92.5 wt .-%, particularly preferably 50 to 90 wt .-%, component A,

B) 1 to 100% by weight, preferably 7.5 to 55% by weight, particularly preferably 10 to 50% by weight, of component B,

C) 0 to 50 wt .-%, preferably 0 to 47.5 wt .-%, particularly preferably 0 to 40 wt .-% of component C, and

D) 0 to 50 wt .-%, preferably 0 to 47.5 wt .-%, particularly preferably 0 to 40 wt .-% component D, wherein the wt .-% are each based on the weight of the thermoplastic matrix M and together 100% by weight.

In addition to the components A, B, C and D, the thermoplastic matrix M may contain other, different from the glass fibers G, components.

As component A of the thermoplastic matrix M are in principle all known in the art and described in the literature styrene-acrylonitrile copolymers, α-methylstyrene-acrylonitrile copolymers or mixtures thereof used, if their mixture with component B a viscosity number VZ (measured according to DIN 53727 at 25 ° C. as 0.5% strength by weight solution in dimethylformamide, this method of measurement also applies to all viscosity numbers VZ mentioned below which are equal to or less than 85 ml / g.

Preferred components A are composed of 50 to 90 wt .-%, preferably 60 to 80 wt .-%, in particular 65 to 78 wt .-%, styrene and 10 to 50 wt .-%, preferably 20 to 40 wt .-% , in particular 22 to 35 wt .-%, acrylonitrile and 0 to 5 wt .-%, preferably 0 to 4 wt .-%, in particular 0 to 3 wt .-%, further monomers, wherein the weight% in each case are based on the weight of component A and together give 100% by weight.

Further preferred components A are composed of 50 to 90 wt .-%, preferably 60 to 80 wt .-%, in particular 65 to 78 wt .-%, α-methylstyrene and 10 to 50 wt .-%, preferably 20 to 40 wt %, in particular 22 to 35% by weight, acrylonitrile and 0 to 5% by weight, preferably 0 to 4% by weight, in particular 0 to 3% by weight, further monomers, where the% by weight each based on the weight of component A and together give 100 wt .-%. Also preferred components A are mixtures of these styrene-acrylonitrile copolymers and these α-styrene-acrylonitrile copolymers.

As the other monomers mentioned above, all monomers which are copolymerizable and other than maleic anhydride can be used, for example p-methylstyrene, t-butylstyrene, vinylnaphthalene, alkylacrylates and / or alkylmethacrylates, for example those with C 1 to C 5 alkyl radicals, N-phenylmaleimide or mixtures thereof.

The copolymers of component A can be prepared by methods known per se. You can z. B. by radical polymerization, in particular by emulsion, suspension, solution or bulk polymers.

As component B of the thermoplastic matrix M, in principle all styrene-acrylonitrile-maleic anhydride copolymers known to those skilled in the art and described in the literature, α-methylstyrene-acrylonitrile-maleic anhydride copolymers or mixtures thereof can be used, provided that their mixture with component A is equal to a viscosity number VZ or less than 85 ml / g.

Preferred components B are composed of 60 to 90% by weight, preferably 70 to 84% by weight, in particular 72 to 77% by weight, of styrene and / or α-methylstyrene and 9.8 to 39.8% by weight. %, preferably 15.5 to 29.5 wt .-%, in particular 22 to 27 wt .-%, acrylonitrile and 0.2 to 5 wt .-%, preferably 0.5 to 4 wt .-%, in particular 1 to 3 wt .-%, maleic anhydride, wherein the wt .-% each based on the weight of component B and together give 100 wt .-%. Component B is particularly preferably a styrene-acrylonitrile-maleic anhydride copolymer of the abovementioned compositions. In addition to the monomers mentioned, component B may contain further copolymerizable monomers, for example in amounts of up to 5% by weight, based on the weight of component B.

Component B can be prepared in a manner known per se. A suitable method is to dissolve the monomer components of the copolymer, e.g. As the styrene, maleic anhydride or acrylonitrile in a suitable solvent, for example methyl ethyl ketone (MEK). One or more chemical initiators may be added to this solution. Suitable initiators are the Expert in principle known. Suitable examples are peroxides. In another embodiment, the initiation takes place not chemically but thermally. Subsequently, the mixture is polymerized for several hours at elevated temperature. Subsequently, the solvent and the unreacted monomers are removed in a conventional manner.

Independently of one another, components B and, if present, A usually have viscosity numbers VZ equal to or less than 85 ml / g, in particular those in the range from 40 to 85 ml / g, preferably in the range from 50 to 80 ml / g, particularly preferably in Range from 60 to 75 ml / g.

It is essential to the invention that the viscosity number VZ of the mixture of components A and B is equal to or less than 85 ml / g, in particular in the range from 40 to 85 ml / g, preferably in the range from 50 to 80 ml / g, particularly preferably in the range from 60 to 75 ml / g is (if the thermoplastic matrix M contains no component A, these viscosity numbers VZ mentioned are of course essential to the invention features of component B).

The thermoplastic matrix M may contain one or more rubber-elastic polymers as component C. In principle, all rubber-elastic polymers or elastomers known to the person skilled in the art are suitable. For example, graft rubbers based on butadiene, butadiene / styrene, EPDM (ethylene-propylene-diene rubbers) or acrylates are suitable. These rubber-elastic polymers generally have a glass transition temperature Tg <0 ⁰ C.

As elastomeric polymer C in the context of the present invention, in particular those are suitable which contain a diene rubber based on dienes such. Butadiene or isoprene, an alkyl acrylate rubber based on alkyl esters of acrylic acid, such as

Butyl acrylate and 2-ethylhexyl acrylate, an EPDM rubber based on ethylene, propylene and a diene, a silicone rubber based on polyorganosiloxanes, or mixtures of these rubbers or rubber monomers.

The rubber-elastic polymer C is particularly preferably a graft polymer comprising a graft base, in particular a crosslinked diene or acrylate graft base, and one or more graft shells, in particular one or more styrene, acrylonitrile or methyl methacrylate graft shells.

Processes for the preparation of the rubber-elastic polymers are known to the person skilled in the art and described in the literature. The thermoplastic matrix M may contain one or more plastic-compatible additives as component D. In principle, all plastic additives known to the person skilled in the art and described in the literature are suitable. Plastic additives for the purposes of the present invention are, for example, stabilizers and antioxidants, agents against heat decomposition and decomposition by ultraviolet light, lubricants and mold release agents, dyes and pigments and plasticizers.

Oxidation inhibitors and heat stabilizers that can be added to the thermoplastic matrix M according to the invention are, for. B. halides of metals of Group I of the Periodic Table, z. For example, sodium, potassium, lithium halides. Furthermore, zinc fluoride and zinc chloride can be used. Further, sterically hindered phenols, hydroquinones, substituted members of this group, secondary aromatic amines, optionally in conjunction with phosphorus-containing acids or their salts, and mixtures of these compounds, preferably in concentrations up to 1 wt .-%, based on the weight of the thermoplastic Matrix M, usable.

Examples of UV stabilizers are various substituted resorcinols, salicylates, benzotriazoles and benzophenones, which are generally used in amounts of up to 2% by weight, based on the weight of the thermoplastic matrix M.

Lubricants and mold release agents, which can generally be added in amounts of up to 1% by weight, based on the weight of the thermoplastic matrix M, of stearic acid, stearyl alcohol, stearic acid alkyl esters and amides and esters of pentaerythritol with long-chain fatty acids , There may also be salts of calcium, zinc or aluminum of stearic acid and dialkyl ketones, eg. B. distearyl ketone used. Particularly suitable according to the invention is calcium stearate.

As glass fibers G, all fiber fibers known to the person skilled in the art and described in the literature can be used in the fiber composites according to the invention (see, for example, Milewski, JV, Katz, HS "Handbook of Reinforcements for Plastics", p. 233 et seq., Van Nostrand Reinholt Company Ine, 1987), provided that the length of these glass fibers is equal to or greater than 50 mm; preferred lengths of the glass fibers G, if these are not continuous fibers, are in the range from 50 mm to 100 m, in particular 60 mm to 90 m preferably 70 mm to 50 m; very particularly preferred glass fibers G are rovings, ie a plurality of glass fibers combined in parallel to one strand, the abovementioned lengths and endless fibers, ie glass fibers having a length which is practically unlimited. The diameters of the glass fibers G are usually in the range from 0.1 to 300 .mu.m, preferably from 1 to 100 .mu.m, more preferably from 3 to 50 .mu.m, very particularly preferably from 5 to 30 .mu.m. The diameters mentioned in glass fiber strands or bundles, eg rovings, refer to the diameters of the individual glass fibers (often also referred to as "individual filaments") of these strands or bundles.

The glass fibers G can not only be used as single fibers, strands or bundles, in the form of, for example, mats, fabrics or nonwovens their use is basically possible.

The glass fibers G may consist, for example, of A, E, C, E-CR, D, R, M or S glass (see DIN 1259: 2001-09 [glass, part 1]).

The glass fibers G can be provided with a size, for example a polyurethane shale, a titanate size, or in particular a size of silane compounds, which improves the compatibility of the fiber with the thermoplastic matrix M. Silane compounds suitable as size are e.g. those of the formula I.

(X- (CH ₂ ) n) k-Si- (OC _m H ₂ m ₊ i) 4-k (I)

With

X is NH ₂ -, CH ₂ -CH-, HO- n is an integer from 2 to 10, preferably 3 or 4 m, integer from 1 to 5, preferably 1 or 2 k, integer from 1 to 3, preferably 1.

Preferred silane compounds are aminopropyltrimethoxysilane, aminobutyltrimethoxysilane, aminopropyltriethoxysilane, aminobutyltriethoxysilane and the corresponding silanes which contain a glycidyl group as substituent X instead of NH ₂ .

If sizing is used, the proportion of sizing is generally 0.05 to 5% by weight, based on the weight of the glass fibers G.

The preparation of the glass fibers G is known to the person skilled in the art and described in the literature.

Preferred fiber composites contain

20 to 90 wt .-%, based on the weight of the fiber composite material, a thermoplastic matrix M comprising A) 45 to 92.5% by weight, based on the weight of the thermoplastic matrix M, of a styrene-acrylonitrile copolymer and / or of an α-methylstyrene-acrylonitrile copolymer as component A,

B) 7.5 to 55 wt .-%, based on the weight of the thermoplastic matrix M, of a styrene-acrylonitrile-maleic anhydride copolymer and / or an α-methylstyrene-acrylonitrile-maleic anhydride copolymer, containing 0.5 to 4 wt .-% maleic anhydride, based on the weight of component B, as component B,

C) 0 to 47.5 wt .-%, based on the weight of the thermoplastic matrix M, of a rubbery elastomeric polymer as component C, and

D) 0 to 47.5% by weight, based on the weight of the thermoplastic matrix M, of plastics-compatible additives as component D,

wherein the sum of the components A, B, C and D gives 100 wt .-%, and

10 to 80 wt .-%, based on the weight of the fiber composite material, glass fibers G having a fiber length in the range of 60 mm to 90 m,

wherein the sum of the thermoplastic matrix M and the glass fibers G gives 100 wt .-%, and

wherein the viscosity number VZ of the mixture of components A and B (measured according to DIN 53727 at 25 ° C as 0.5 wt .-% solution in dimethylformamide) in the range of 40 to 85 ml / g.

Particularly preferred fiber composites contain

25 to 70 wt .-%, based on the weight of the fiber composite material, a thermoplastic matrix M comprising

A) 50 to 90% by weight, based on the weight of the thermoplastic matrix M, of a styrene-acrylonitrile copolymer as component A,

B) 10 to 50% by weight, based on the weight of the thermoplastic matrix M, of a styrene-acrylonitrile-maleic anhydride copolymer containing 1 to 3% by weight of maleic anhydride, based on the weight of component B, as component B, C) 0 to 40 wt .-%, based on the weight of the thermoplastic matrix M, of a rubber-elastic polymer based on butadiene and / or acrylates as component C, and

D) 0 to 40% by weight, based on the weight of the thermoplastic matrix M, of plastics-compatible additives as component D,

wherein the sum of the components A, B, C and D gives 100 wt .-%, and

From 30 to 75% by weight, based on the weight of the fiber composite, of glass fibers G in the form of aminosilane-coated rovings having a fiber length in the range from 70 mm to 50 m,

wherein the viscosity number VZ of the mixture of components A and B (measured according to DIN 53727 at 25 ° C as 0.5 wt .-% solution in dimethylformamide) in the range of 60 to 75 ml / g.

The preparation of the thermoplastic matrix M from the individual components is carried out by methods known to those skilled in the art, for example by mixing a melt of component B with optionally further components A, C and / or D, with devices known to those skilled in the art, for example screw extruders, kneaders or mixers , preferably at temperatures in the range of 160 to 320 ^° C, in particular at 180 to 310 ^° C. The components can be supplied in each case pure form the mixing devices. However, individual components can also be premixed first and then mixed with the other components.

The production of the fiber composite materials according to the invention from the thermoplastic matrix M and the glass fibers G can be carried out by all methods known to the person skilled in the art and described in the literature. For example, in a first step, the thermoplastic matrix M can be prepared and in a separate second step, the impregnation of the glass fibers G with the melt of the matrix M done. However, both melt blending of component B with possibly further components A, C and / or D and also impregnation of glass fibers G with the formed matrix M can take place simultaneously in a single process step.

The impregnation of the glass fibers G with the thermoplastic matrix M is carried out by methods known to the person skilled in the art, for example the manual lamination, fiber spraying, conical continuous impregnation, winding or spinning process. The impregnation is preferably carried out by the pultrusion method, the so-called pultrusion (for example described in "M. Fleischhauer, H. Schürmann, Qualification and Testing of a Thermoplastic Matrix System for Structural Components in Traffic Engineering, Volume 11, National Symposium SAMPE Deutschland eV 2005 ").

The fiber composite materials produced in this way can be further processed in a subsequent work step, e.g. by pressing, joining, sawing, turning, milling, grinding, gluing, welding, punching or drilling, preferably by pressing.

In a preferred method for producing the fiber composite materials according to the invention, the components B and optionally A, C and D are melt-mixed to form the thermoplastic matrix M, then the glass fibers G with the thermoplastic matrix M in the pultrusion process, the so-called pultrusion soaked, and Optionally, the fiber composite material thus formed subjected to a subsequent pressing step.

From the fiber composite materials, for example, by the processing methods mentioned above, pressing, joining, sawing, turning, milling, grinding, gluing, welding, stamping or drilling fiber composite components available. In particular, fiber composite components are available for use in the automotive sector and in mechanical and plant engineering.

The fiber composites according to the invention are based on a comparatively temperature-resistant and cost-effective styrene-acrylonitrile copolymer matrix and have a comparison. known fiber composites under elevated temperatures, for example 80 ⁰ C, an improved shear strength, in particular an improved transverse longitudinal shear strength on.

The invention will be explained in more detail below with reference to examples.

Examples:

In the following examples according to the invention and the comparative examples in each case fiber composite materials or fiber composite components were prepared and determined their properties.

measurement methods:

The following properties were determined:

Viscosity number VZ [ml / g] The viscosity number VZ of components A and B or of the mixture of components A and B was measured in accordance with DIN 53727 at 25 ° C. as a 0.5% strength by weight solution in dimethylformamide.

Transverse longitudinal shear strength R _± \ [MPa]

The transverse longitudinal shear strength R _± \ \ at 80 ⁰ C was determined in a bending test according to DIN 53398-2.

Longitudinal compression strength RLD [MPa] The longitudinal compression strength R _LD at 80 ⁰ C was determined in a bending test according to DIN 53398-. 1

Starting Materials:

Component A-1

Copolymer of 75 wt .-% styrene and 25 wt .-% acrylonitrile, characterized by a viscosity number VZ of 80 ml / g.

Component A-2

Copolymer of 76 wt .-% of styrene and 24 wt .-% acrylonitrile, characterized by a viscosity number VZ of 66 ml / g.

Component A-V

Copolymer of 75 wt .-% of styrene and 25 wt .-% acrylonitrile, characterized by a viscosity number VZ of 88 ml / g.

Component B-1

Terpolymer of 74 wt .-% of styrene, 25 wt .-% of acrylonitrile and 1 wt .-% maleic anhydride, characterized by a viscosity number VZ of 80 ml / g.

Component B-2

Terpolymer of 73 wt .-% of styrene, 25 wt .-% of acrylonitrile and 2 wt .-% maleic anhydride, characterized by a viscosity number VZ of 80 ml / g. Glass fibers G-1

Glass fiber roving R099 2400 5383 (endless length) of the company Vetrotex with an aminosilane size, fiber diameter 17μm.

Preparation of the thermoplastic matrix M

The amounts of the components A and B given above in Table 1 were mixed in a twin screw extruder at a melt temperature of 240-260 ⁰ C. The melt was passed through a water bath and granulated. The viscosity number VZ of the respective mixture of components A and B thus obtained is also mentioned in Table 1.

Table 1: parts by weight of components A and B, VZ of the mixtures of A and B.

^* Examples marked "V" are comparative examples

Production and properties of fiber composites and fiber composite components

The thermoplastic matrices M of the compositions mentioned in Table 1 were melted in a single-screw extruder and fed to the drinking unit of a pultrusion plant. At the same time, the glass fiber rovings G-1 were pulled in. The take-off speed was 2 m / min. The proportion by weight of the glass fibers G, based on the total weight of the matrix M and the glass fibers G, was 69% by weight in each case.

Fiber composite components were produced from the fiber composite materials obtained by melting and pressing in an electrically heated hydraulic press at a maximum pressing force of 120 kN (dimensions of the fiber composite components: length 380 mm, width 40 mm, height 6 mm). During the pressing process, the proportion by weight of the glass fibers G, based on the total weight of the matrix M and the glass fibers G, increased to 71% by weight in each case. Samples of a length of 60 mm, a width of 20 mm and a height of 6 mm were milled out of these fiber composite components.

Table 2 shows the transverse longitudinal shear strength R _± \ \ and the longitudinal compressive strength R _{LD of} the specimens thus obtained.

Table 2: Properties of the fiber composite components

^* Examples marked "V" are comparative examples

The examples demonstrate the improved shear strength at elevated temperatures, in particular the improved transverse longitudinal shear strength, of the fiber composite materials or fiber composite components according to the invention.

Claims

claims

1. fiber composite material containing

B) 1 to 100% by weight, based on the weight of the thermoplastic matrix M, of a styrene-acrylonitrile-maleic anhydride copolymer and / or of an α-methylstyrene-acrylonitrile-maleic anhydride copolymer as component B,

D) 0 to 50 wt .-%, based on the weight of the thermoplastic matrix

M, plastic-compatible additives as component D,

wherein the sum of the components A, B, C and D gives 100 wt .-%, and

characterized in that the viscosity number VZ of the mixture of components A and B (measured according to DIN 53727 at 25 ° C as 0.5 wt .-% solution in dimethylformamide) is equal to or less than 85 ml / g and the length of the glass fibers G is equal to or greater than 50 mm.

2. Fiber composite material according to claim 1, containing 20 to 90 wt .-% of the thermoplastic matrix M and 10 to 80 wt .-% glass fibers G, wherein the wt .-% each based on the weight of the fiber composite material and together 100 wt. % result.

3. fiber composite material according to claims 1 to 2, comprising a thermoplastic matrix M, comprising A) 45 to 92.5% by weight of component A,

B) 7.5 to 55% by weight of component B,

C) 0 to 47.5% by weight, component C, and D) 0 to 47.5% by weight, component D,

wherein the wt .-% each based on the weight of the thermoplastic matrix M and together give 100 wt .-%.

4. fiber composite material according to claims 1 to 3, characterized in that component A is a styrene-acrylonitrile copolymer.

5. fiber composite material according to claims 1 to 4, characterized in that component B 60 to 90 wt .-% of styrene and / or α-methyl styrene,

9.8 to 39.8 wt .-% of acrylonitrile and

0.2 to 5 wt .-% maleic anhydride, wherein the wt .-% each based on the weight of component B and together give 100 wt .-%.

6. fiber composite material according to claims 1 to 5, characterized in that component B is a styrene-acrylonitrile-maleic anhydride copolymer.

7. fiber composite material according to claims 1 to 6, characterized in that the rubber-elastic polymer, component C, a graft rubber

Based on butadiene, butadiene / styrene, EPDM or acrylates.

8. fiber composite material according to claims 1 to 7, characterized in that the viscosity number VZ of the mixture of components A and B (measured according to DIN 53727 at 25 ° C as 0.5 wt .-% solution in dimethylformamide) in the range of 50 to 80 ml / g.

9. fiber composite material according to claims 1 to 8, characterized in that are used as glass fibers G continuous fibers or rovings.

10. A process for the production of fiber composites according to any one of claims 1 to 9, characterized in that the components A, B, C and D are melt-mixed to form the thermoplastic matrix M, then the glass fibers G with the thermoplastic matrix M in the pultrusion process , the so-called pultrusion, and optionally the so formed

Fiber composite material is subjected to a subsequent pressing step.

1. fiber composite component, made of fiber composites according to one of claims 1 to 9.