EP2953982A1 - Method for the production of abs compositions having an improved surface - Google Patents

Abstract

The invention relates to a method for producing compositions containing vinyl-aromatic copolymers which are obtained in an emulsion polymerization process and comprise production-related salt inclusions. Said compositions are characterized by an improved surface quality once the extruded polymer, before being granulated, or the granulate, after being granulated, has been moistened by bringing the polymer in contact with liquid water in a water bath, a tube system filled with water, or a dipping tank, thus making the compositions suitable for producing molded articles having a class A surface that remains flawless over time.

Description

 Process for the preparation of ABS compositions with improved surface

The present invention relates to a process for the preparation of compositions comprising vinylaromatic copolymers prepared by the emulsion polymerization process with production-induced salt inclusions, which are distinguished by an improved surface quality, after the polymer strands have undergone granulation or the granules, after granulation, by contact with liquid water in a water bath were moistened with water-filled pipe system or a dip tank and stored after removal of non-adhering to the granules surface water for a defined period of surface moisture and then melted and kneaded. These compositions are particularly suitable for the production of moldings with age stable defect-free Class A surface.

The present invention furthermore relates to the compositions produced by the process according to the invention and their use for the production of moldings having a Class A surface requirement and partial or complete high-gloss finish, which may optionally be partially or completely subjected to a further surface treatment step by, for example, painting, curtain coating, Metallization by vacuum deposition or galvanization may be subjected.

Compositions containing vinylaromatic copolymers prepared in the emulsion polymerization process and containing salt inclusions as a result of the preparation are known from the literature. Sources of such production-induced salt inclusions are manifold, for example emulsifier solutions used in the emulsion polymerization process, polymerization initiator solutions, buffer solutions and precipitant solutions which remain in the material during the workup of the polymer, depending on the process, or are only partially removed from the material. In particular, the precipitation of vinyl polymer latices prepared by emulsion polymerization by means of addition of acids and / or salts, which is generally carried out in, for example, EP 459 161 B1, DE 2 021 398 and DE 28 15 098, contributes to the salt load to a considerable extent of the final polymer, since these salts can generally be removed from the product by downstream process steps (washes) only inadequately or at great expense (energy and water / wastewater). Examples of suitable coagulants are aqueous solutions of water-soluble salts, for example alkali metal, alkaline earth metal or aluminum chlorides, sulfates, nitrates, phosphates, acetates, formates, aluminates or carbonates, more preferably aluminum chloride, calcium chloride and magnesium sulfate. Solutions, optionally in combination with inorganic or organic Acids such as hydrochloric acid, sulfuric acid, phosphoric acid, boric acid, formic acid, acetic acid, propionic acid and citronic acid are used.

It is described in the literature that such salt inclusions in compositions containing vinylaromatic copolymers can lead to undesirable effects. WO 2009/071537 discloses, for example, that magnesium and / or calcium compounds in toughened vinylaromatic copolymers selected from the group of the acrylonitrile-butadiene-styrene copolymers (ABS), acrylonitrile-styrene-acrylate copolymers (ASA) and methacrylate-acrylonitrile-butadiene Styrene copolymers (MABS), optionally containing polycarbonate and additives, in thermoplastic molding by injection molding or extrusion lead to undesirable film formation on the molding tool and, more particularly, require compositions containing magnesium and / or calcium compounds of 0 mg / kg to 100 mg / kg. The emulsion polymers used in these compositions are precipitated by freeze precipitation on a flake ice machine instead of adding magnesium sulfate solution as is customary in the art. WO 98/28344 discloses a process for the continuous coagulation of aqueous dispersions of graft rubbers by shear, which has the known disadvantage of precipitation by means of acids and / or salts as coagulants, that often impurities remain in the processed polymers, which can lead to a deterioration of the product properties , overcomes.

A problem of thermoplastic compositions comprising vinylaromatic copolymers prepared by the emulsion polymerization method with production-induced salt inclusions is that moldings produced therefrom are prone to the undesired formation of surface defects (blistering) on exposure to moisture (for example condensation water or air moisture), in particular at elevated temperatures. which limit the use of such compositions in molded parts with a high gloss finish and Class A surface finish.

EP 2 398 842 A1 discloses a compounding process for producing impact-modified polycarbonate compositions with reduced content of volatile organic compounds, in which 2 to 40% by weight, based on the sum of impact modifier and water, of liquid water is added to the pulverulent graft polymer used as an impact modifier and the premix so prepared in the compounding of impact modified Polycarbonate compositions is used. This method corresponds to a comparative example in this application.

In JP2010110935 granules are mixed with water with the aim to remove dust or fines from the granules. The water is then removed again via a porous body. WO2010052872 also describes the mixing of granules to the superficial

Purification of the granules. However, these procedures do not allow a treatment according to the invention.

EP2072203 describes the treatment of granules with water for the purpose of removing residual monomers. For this purpose, the granules are boiled for 15 min to 6 h in water or other liquids to remove residual monomers.

WO2008090674 discloses a method for cooling PC granules after strand granulation. After the granulator there is a second cooling step in water with a given temperature profile.

DE 102004053929 and DE 202004017275 describes the thermal treatment after underwater granulation. Granules are mixed again with granulated water after granulation and centrifuge and then dried in a dryer.

The object of the present invention was thus to provide an improved process which allows the production of thermoplastic compositions comprising vinylaromatic copolymers produced by the emulsion polymerization process with production-induced salt inclusions which are distinguished by an improved surface quality after heat-moisture storage and, thus, to the production of moldings with aging stable visually defect-free Class A surface are suitable.

In the context of the present invention, "visually defect-free Class A surfaces" are to be understood as meaning surfaces which have no bubbles with a number and diameter that are perceived as disturbing to the naked eye, and which preferably have "visually defect-free Class A surfaces "a relative area of defects with bubble topography based on the investigated surface area (A _re i) of less than 50 ppm, preferably less than 30 ppm, more preferably less than 20 ppm.

Furthermore, these surfaces in a preferred embodiment after a heat-wet treatment (condensation test according to DIN EN ISO 6270-2, test duration 72 h) no bubbles with a diameter of greater than 300 μιη on. However, such visually defect-free Class A surfaces still often have bubbles that are mixed with optical aids, e.g. As magnifying glass or microscope, are visible. The relative area of defects with bubble topography based on the examined surface area (A _re i) is preferably 0.1 to 50 ppm, particularly preferably 1 to 30 ppm, particularly preferably 3 to 20 ppm. The maximum defect size, that is to say the diameter of the largest bubble-topography defects found on such visually defect-free Class A surfaces, is preferably in the range from 10 μm to 8 300 μm.

Surprisingly, it has now been found that this object is achieved by a process for preparing compositions containing

A) 0 to 98 parts by weight, preferably 1 to 95 parts by wt., In particular 30 to 85 parts by wt., Based on the sum of A and B, one or a mixture of several thermoplastic polymers different from B and

B) 2 to 100 parts by weight, preferably 5 to 99 parts by weight, particularly preferably 15 to 70 parts by weight, based on the sum of A and B, from

Bl) at least one graft polymer prepared in the emulsion polymerization process, B2) optionally at least one graft polymer prepared by the bulk, suspension or solution polymerization process,

 B3) optionally at least one rubber-free vinyl (co) polymer, and

C) 0 to 30 parts by weight, preferably 0.1 to 20 parts by weight, in particular 0.3 to 7 parts by weight, based on the sum of A and B, of at least one commercially available polymer additive, wherein the sum the weight parts A and B added to 100, and the component B, preferably the component Bl or a pre-compound of component B l with at least one of the components B2 and B3 or with a subset of at least one of the components B2 and B3, more preferably a pre-compound Component B1 and the total or partial amount of component B3, at least one inorganic salt consisting of a cation selected from the group of alkali metals, alkaline earth metals and aluminum and an anion selected from the group consisting of chloride, sulfate, nitrate, phosphate, Acetate and formate, in a concentration of the salt or salt mixture of 100 to 5000 mg / kg, preferably from 150 to 2000 mg / kg, more preferably from 200 to 1000 mg / kg, based on the composition , contains, characterized in that a) in a first process step, the entire (s) containing the salt component (s) of B, optionally with a part or the total amount of the remaining components of B, A and C in a compounding, preferably an extruder, to a Polymer Blend is processed, this polymer melt is subsequently discharged from the extruder and in the form of polymer strands before granulation or alternatively in the form of granules after granulation fully charged by contact with liquid water in a water bath, a water-filled pipe system or a dip tank with water b) in a second process step, the thus treated with water granules is separated from not adhering to the surface of the granules water and then stored surface moist, c) in a third step, the so moist stored granules is melted and kneaded in the molten state, and / or d) in a fourth V procedural step, the so-prepared component mixed with the remaining components of the composition, the mixture is remelted, kneaded and thereby the components of the mixture are dispersed into each other.

The determination of the internal moisture is carried out after surface granule drying by Karl Fischer titration. The granules are heated with an IR balance to constant weight to a temperature of 80 ° C in order to remove the superficially adhering moisture. The amount of water removed in this way, based on the granulate weight, is referred to as surface moisture, and subsequently the superficially dried granules are subjected to a Karl Fischer titration. The term "internal moisture" refers to the amount of water which, based on the granulate weight, is determined by Karl Fischer titration. The total moisture of a granulate corresponds to the sum of internal moisture and surface moisture.

The storage of the surface moist granules in process step b) can be carried out continuously or discontinuously.

The application of liquid water in process step a) takes place in the temperature range from 5 to 95 ° C, preferably, from 10 to 90 ° C, particularly preferably from 20 to 85 ° C.

The preferred ranges for the process temperatures in process steps a) and b) above are limited by the fact that above 85 ° C., the granules tend increasingly to soften and thereby bond with increasing temperature and thereby their Dosing in the further process steps b) and optionally c) is adversely affected or further process steps are necessary to bring the granules back into a meterable form.

The residence time of the strands or granules in the water bath in process step a) is preferably between 1 second and 60 minutes, more preferably between 2 seconds and 10 minutes, most preferably between 3 seconds and 60 seconds.

The moistening can be carried out in a water bath, as it is usually used for strand granulation in extrusion or other compounding aggregates for solidifying the polymer melts before granulation. The moistening can be carried out in a water-filled pipe system, as is commonly used in underwater pelletizing. The moistening may be carried out in other apparatus used for granulation in contact with water. In an alternative embodiment, the moistening can also take place on the granules prepared separately in a mixing apparatus, for example a tumble mixer. Humidification may, but need not, occur immediately after production or processing in the molten state, for example in an extruder. After moistening, granulation of the polymer strands may be carried out so that the strands remain moist.

After moistening, a process step follows, in which non-superficially adhering water is separated from the granules. This can be done, for example, by screening. The maintenance of a surface-wetted state is essential.

The amount of water in the surface moist granules is in a preferred embodiment at least 1 wt .-%, preferably at least 2 wt .-%, more preferably at least 3 wt .-%, based on the sum of water and granules, and a maximum of 30 wt .-%, preferably not more than 20% by weight, more preferably 10% by weight, based on the sum of water and granules. The humidification is followed in process step b) a storage time in the surface wet state. The granules must not be superficially dried before or during this storage period. The storage can be carried out in a silo or in any container.

The mean storage time of the moist granules in process step b) is at least 24 h, preferably at least 48 h, more preferably at least 72 h. In this case, more preferably, at most 10% of the granules should experience a storage time of less than 72 hours and a maximum of 1% of the granules experience a storage time of less than 24 hours. In the preferred embodiment the average storage time is not more than 1000 h, preferably not more than 700 h, more preferably not more than 500 h, most preferably not more than 200 h.

Preferably, the salt-containing component (s) B, or only the salt-containing component B l, or the salt-containing precompound of component B l with at least one of the components B2 and B3 or with a subset of at least one of the components B2 and B3 used as granules.

In a preferred embodiment, the storage is followed by an apparatus for separating the superficial water from the stored granules. Such an apparatus may for example be a belt dryer, a centrifugal dryer, a fluidized bed dryer or a current dryer, a drying cabinet or a shaft dryer. A preferred embodiment is a centrifugal dryer. Furthermore, a promotion, for example, a flight promotion with dry and / or heated air for surface drying be downstream. This step ensures easy transportability, storability and meterability of the granules in subsequent processing steps. More preferably, the water content of the granules used in process step c) 0.3 to 2.0 wt .-%, even more preferably from 0.5 to 1.8 wt .-% and particularly preferably from 0.6 to 1.6 Wt .-% based on the component (s) B, or the respective (s) subjected to the water sub-component (s). This moisture is measured after a superficial drying of the granules and therefore refers to the moisture inside the granules. "Granulate" in the sense of the invention is understood as meaning a component or a mixture of a plurality of components which is in the solid state of aggregation The size of the granules is 2-5 mm, more preferably 2.5-4 mm Lenticular, spherical or cylindrical shape.

For the purposes of the invention, "powder" or "pulverulent" is understood to mean a component or a mixture of a plurality of components which is in the solid state and in which the particles have particle sizes of less than 2 mm, preferably less than 1 mm, in particular less than 0.5 mm.

Optionally, additional steps can be carried out between the moistening and the compounding, for example for storage, filling, transport or the like. In an alternative and preferred embodiment, the entirety or a partial amount, more preferably the total amount of components A and C and the residual amounts of component B of the composition already in step (c) added, dispersed by the kneading process and the in process step a) in the process introduced water is removed by applying a negative pressure of preferably at least 200 mbar, more preferably of at least 500 mbar, more preferably of at least 800 mbar again from the product.

In a last step e), the composition is generally subsequently cooled and granulated again. According to the invention, the component B, preferably the component Bl, contains at least one inorganic salt consisting of a cation selected from the group of alkali metals, alkaline earth metals and aluminum and an anion selected from the group consisting of chloride, sulfate, nitrate, phosphate, acetate and formate.

Preferably, the salt is an alkali, alkaline earth or aluminum chloride or an alkali, alkaline earth or aluminum sulfate, or a mixture thereof, more preferably the salt is selected from the group consisting of aluminum chloride, calcium chloride and magnesium sulfate, or mixtures thereof, especially preferably, the salt is magnesium sulfate.

In a preferred embodiment, the composition consists only of the components A, B and C. In a further preferred embodiment, the component B consists of at least two components selected from the group consisting of Bl, B2 and B3, more preferably from the components B 1 and B3, more preferably from Bl, B2 and B3.

The inorganic salt is preferably introduced into the composition via component B 1, which preferably contains the salt as a production-related impurity. Particularly preferably, the salt is present in the form of production-induced salt inclusions in component B 1.

Component B, preferably component Bl, contains the salt in a concentration of 100 to 5000 mg / kg, preferably from 150 to 3000 mg / kg, more preferably from 200 to 1500 mg / kg, based on the composition. The content of inorganic salt is determined via the anion contents of chloride, sulfates, nitrate, phosphate, acetate, or formate, preferably chloride or sulfate, particularly preferably sulfate. Such a determination is made after suitable material digestion by ion chromatography via conductivity measurement according to the method described in the examples for the determination of the magnesium sulfate content.

An advantage of this method is on the one hand the simpler extensive, in a preferred embodiment exclusive handling of component B and its components in the form of granules to powders that tend to adhesive bonds and also have the tendency to explode, on the other hand, the possibility of ABS in granular form with high production salt without to use additional complicated cleaning steps such as washing or melt filtration for the production of Class A surface components.

Component A

In principle, all types of component B of various thermoplastic polymers or mixtures of two or more than two such thermoplastic polymers are suitable as component A.

Examples include polyolefins (such as polyethylene and polypropylene), thermoplastic polyurethanes, polyacetals (such as polyoxymethylene and polyphenylene ether), polyamides, polyimides, polycarbonates, polyesters, polyester carbonates, polysulfones, polyarylates, polyaryl ethers, polyphenylene ethers, polyarylsulfones, polyarylsulfides, polyethersulfones, polyphenylene sulfide, polyether ketones , Polyamideimides, polyetherimides and polyesterimides.

Particularly preferred as component A is at least one polymer selected from the group consisting of polycarbonate, polyester and polyester, more preferably at least one polymer selected from the group consisting of aromatic polycarbonate, aromatic polyester and aromatic polyester, most preferably a polymer selected from the group consisting of aromatic polycarbonate and aromatic polyester carbonate for use.

Aromatic polycarbonates and / or aromatic polyester carbonates according to component A which are suitable according to the invention are known from the literature or can be prepared by processes known from the literature (for example, see Schnell, Chemistry and Physics of Polycarbonates, Interscience Publishers, 1964 and DE-AS 1 495 626, DE -A 2 232 877, DE-A 2 703,376, DE-A 2714544, DE-A 3 000610, DE-A 3 832 396; for the preparation of aromatic polyester carbonates, for. B. DE-A 3077934).

The preparation of aromatic polycarbonates is e.g. by reacting diphenols with carbonyl halides, preferably phosgene and / or with aromatic dicarboxylic acid dihalides, preferably benzenedicarboxylic acid dihalides, by the interfacial process, if appropriate using chain terminators, for example monophenols and optionally using trifunctional or more than trifunctional branching agents, for example triphenols or Tetra phenols. Likewise, preparation via a melt polymerization process by reaction of diphenols with, for example, diphenyl carbonate is possible.

Diphenols for the preparation of the aromatic polycarbonates and / or aromatic polyester carbonates are preferably those of the formula (I)

in which

A is a single bond, Cl to C5-Alk len, C2 to C5-Alk lids, C5 to C6-Cycloalk liden, -O-, -SO-, -CO-, -S-, -SO2-, C6 to C12-arylene to which further aromatic rings containing optionally heteroatoms may be condensed, or a radical of the formula (II) or (III)

(II)

B is in each case C1 to C12-alkyl, preferably methyl, halogen, preferably chlorine and / or bromine x, each independently of one another 0, 1 or 2,

P is 1 or 0, and

R5 and R6 are individually selectable for each XI, independently of one another hydrogen or C1 to C6-alkyl, preferably hydrogen, methyl or ethyl,

XI is carbon and m is an integer from 4 to 7, preferably 4 or 5, with the proviso that on at least one atom XI, R5 and R6 are simultaneously alkyl.

Preferred diphenols are hydroquinone, resorcinol, dihydroxydiphenols, bis (hydroxyphenyl) C1-C5alkanes, bis (hydroxyphenyl) C5-C6-cycloalkanes, bis (hydroxyphenyl) ethers, bis (hydroxyphenyl) sulphoxides , Bis (hydroxyphenyl) -ketones, bis (hydroxyphenyl) -sulfones and a, a-bis (hydroxyphenyl) -diisopropyl-benzenes and their nuclear-brominated and / or nuclear-chlorinated derivatives.

Particularly preferred diphenols are 4,4'-dihydroxydiphenyl, bisphenol A, 2,4-bis (4-hydroxyphenyl) -2-methylbutane, 1,1-bis- (4-hydroxyphenyl) -cyclohexane, 1, 1 - Bis (4-hydroxyphenyl) -3.3.5-trimethylcyclohexane, 4,4'-dihydroxydiphenylsulfide, 4,4'-dihydroxydiphenylsulfone and their di- and tetrabrominated or chlorinated derivatives such as 2,2-bis (3-chloro-4-) hydroxyphenyl) propane, 2,2-bis (3,5-dichloro-4-hydroxyphenyl) -propane or 2,2-bis (3,5-dibromo-4-hydroxyphenyl) propane. Particularly preferred is 2,2-bis (4-hydroxyphenyl) propane (bisphenol-A).

The diphenols can be used individually or as any mixtures. The diphenols are known from the literature or obtainable by literature methods.

Chain terminators suitable for the preparation of the thermoplastic, aromatic polycarbonates are, for example, phenol, p-chlorophenol, p-tert-butylphenol or 2,4,6-tribromophenol, but also long-chain alkylphenols, such as 4- [2- (2,4,4 -Trimethylpentyl)] - phenol, 4- (l, 3-tetramethylbutyl) phenol according to DE-A 2 842 005 or monoalkylphenol or dialkylphenols having a total of 8 to 20 carbon atoms in the alkyl substituents, such as 3,5-di-tert-butylphenol, p-iso-octylphenol, p-tert-octylphenol, p-dodecylphenol and 2 - (3,5-dimethylheptyl) phenol and 4- (3,5-dimethylheptyl) phenol. The amount of chain terminators to be used is generally between 0.5 mol%, and 10 mol%, based on the molar sum of the diphenols used in each case.

The thermoplastic aromatic polycarbonates preferably have weight average molecular weight (Mw, as measured by gel permeation chromatography in methylene chloride at 25 ° C with polycarbonate as standard) of 20,000 to 40,000 g / mol, preferably 22,000 to 35,000 g / mol, more preferably 24,000 to 32,000 g / mol , The thermoplastic, aromatic polycarbonates may be branched in a known manner, preferably by the incorporation of 0.05 to 2.0 mol%, based on the sum of the diphenols used, of trifunctional or more than trifunctional compounds, for example those with three and more phenolic groups.

Both homopolycarbonates and copolycarbonates are suitable. For the preparation of inventive copolycarbonates according to component A, it is also possible to use from 1 to 25% by weight, preferably from 2.5 to 25% by weight, based on the total amount of diphenols to be used, of hydroxyaryloxy endblocked polydiorganosiloxanes. These are known (US 3 419 634) and can be prepared by literature methods. The preparation of polydiorganosiloxane-containing copolycarbonates is described in DE-A 3 334 782. Preferred polycarbonates, in addition to the bisphenol A homopolycarbonates, are the copolycarbonates of bisphenol A with up to 15 mol%, based on the molar sums of diphenols, of other than preferred or particularly preferred diphenols, in particular 2,2-bis (3,5-bis). dibromo-4-hydroxyphenyl) -propane.

Aromatic Dicarbonsäuredihalogemde for the preparation of aromatic polyester carbonates are preferably the diacid dichlorides of isophthalic acid, terephthalic acid, diphenyl ether-4,4'-dicarboxylic acid and naphthalene-2,6-dicarboxylic acid.

Particularly preferred are mixtures of the diacid dichlorides of isophthalic acid and terephthalic acid in the ratio between 1:20 and 20: 1.

In the production of polyester carbonates, a carbonic monohalogen, preferably phosgene, is additionally used as the bifunctional acid derivative. As chain terminators for the preparation of the aromatic polyester are in addition to the aforementioned monophenols still their chlorocarbonic acid esters and the acid chlorides of aromatic monocarboxylic acids, which may optionally be substituted by Cl to C22-alkyl groups or by halogen atoms, as well as aliphatic C2 to C22 monocarboxylic.

The amount of chain terminators is in each case 0.1 to 10 mol%, based on moles of diphenol in the case of the phenolic chain terminators and on moles of dicarboxylic acid dichloride in the case of monocarboxylic acid chloride chain terminators.

The aromatic polyester carbonates may also contain incorporated aromatic hydroxycarboxylic acids.

The aromatic polyester carbonates can be branched both linearly and in a known manner (see DE-A 2 940 024 and DE-A 3 007 934).

Examples of suitable branching agents are trifunctional or polyfunctional carboxylic acid chlorides, such as trimesic acid trichloride, cyanuric trichloride, 3,3'-, 4,4'-benzophenone tetracarboxylic acid tetrachloride, 1,4,5,8-naphthalene tetracarboxylic acid tetrachloride or pyromellitic acid tetrachloride, in amounts of 0, 01 to 1.0 mol% (based on dicarboxylic acid dichlorides used) or trifunctional or polyfunctional phenols, such as phloroglucinol, 4,6-dimethyl-2,4,6-tri- (4-hydroxyphenyl) hept-2-ene, 4 , 6-Dimethyl-2,4,6-tris (4-hydroxyphenyl) heptane, 1,3,5-tris (4-hydroxyphenyl) benzene, 1,1,1-tri- (4-hydroxyphenyl) -ethan, tri- (4-hydroxyphenyl) -phenylmethane, 2,2-bis [4,4-bis (4-hydroxyphenyl) -cyclohexyl] -propane, 2,4-bis (4-hydroxyphenyl-isopropyl) - phenol, tetra (4-hydroxyphenyl) methane, 2,6-bis (2-hydroxy-5-methylbenzyl) -4-methylphenol, 2- (4-hydroxyphenyl) -2- (2,4-bis) dihydroxyphenyl) -propane, tetra- (4- [4-hydroxyphenyl-isopropyl] -phenoxy) -methane, 1,4-bis [4,4'-dihydroxytri-phenyl) -methyl] -benz o 1, in quantities from 0.01 to 1.0 mol%, based on diphenols used. Phenolic branching agents can be introduced with the diphenols, acid chloride branching agents can be added together with the acid dichlorides.

In the thermoplastic aromatic polyester compositions, the proportion of carbonate structural units can vary as desired. The proportion of carbonate groups is preferably up to 100 mol%, in particular up to 80 mol%, particularly preferably up to 50 mol%, based on the sum of ester groups and carbonate groups. Both the ester and the carbonate portion of the aromatic polyester carbonates may be present in the form of blocks or randomly distributed in the polycondensate. The thermoplastic, aromatic polycarbonates and polyester carbonates can be used alone or in any desired mixture.

Component Bl

Component B 1 is propofpolymer, produced in the emulsion polymerization process, of a preferred embodiment,

Bl. I) 5 to 95 wt .-%, preferably 10 to 70 wt .-%, particularly preferably 20 to 60

Wt .-%, based on the component B 1, a mixture of

Bl .l .1) 65 to 85 wt .-%, preferably 70 to 80 wt .-%, based on B l. l, at least one monomer selected from the group of vinyl aromatics (such as styrene, α-methyl styrene), ring-substituted vinyl aromatics (such as p-methyl styrene, p-chlorostyrene) and methacrylic acid (C1-C8) alkyl esters (such as methyl methacrylate , Ethyl methacrylate) and

Bl .l .2) 15 to 35 wt .-%, preferably 20 to 30 wt .-%, based on Bl .l, of at least one monomer selected from the group of vinyl cyanides (such as unsaturated nitriles such as acrylonitrile and methacrylonitrile), ( Meth) acrylic acid (C 1 -C 8) -alkyl esters (such as, for example, methyl methacrylate, n-butyl acrylate, tert-butyl acrylate) and derivatives (such as, for example, anhydrides and imides) of unsaturated carboxylic acids (for example maleic anhydride and N-phenyl-maleimide)

B1.2) 95 to 5 wt .-%, preferably 90 to 30 wt .-%, particularly preferably 80 to 40 wt .-%, based on the component B 1, at least one elastomeric graft base. The graft base preferably has a glass transition temperature <0 ° C., more preferably <-20 ° C., particularly preferably <-60 ° C.

Glass transition temperatures, unless otherwise stated in the present invention, determined by means of differential scanning calorimetry (DSC) according to the standard DIN EN 61006 at a heating rate of 10 K / min with definition of the Tg as the midpoint temperature (tangent method) and nitrogen as inert gas.

The graft particles in the component Bl preferably have an average particle size (D50 value) of 0.05 to 5 μm, preferably from 0.1 to 1.0 μm, particularly preferably from 0.2 to 0.5 μm. The mean particle size D50 is the diameter, above and below which are each 50% by weight of the particles. Unless explicitly stated otherwise in the present application, it is determined by ultracentrifuge measurement (W. Scholtan, H. Lange, Kolloid, Z. and Z. Polymere 250 (1972), 782-1796). Preferred monomers B 1.1.1 are selected from at least one of the monomers styrene, α-methylstyrene and methyl methacrylate, preferred monomers B l .1.2 are selected from at least one of the monomers acrylonitrile, maleic anhydride and methyl methacrylate.

Particularly preferred monomers are B 1.1.1 styrene and Bl .1.2 acrylonitrile.

Examples of suitable grafting bases B 1.2 for the graft polymers B1 are diene rubbers, diene-vinyl block copolymer rubbers, EP (D) M rubbers, alsosols for ethylene and propylene and optionally diene, acrylate, polyurethane, silicone , Chloroprene and ethylene / vinyl acetate rubbers and mixtures of such rubbers or silicone-acrylate composite rubbers in which the silicone and the acrylate components are chemically linked to one another (eg by grafting). Preferred graft bases B1.2 are diene rubbers (for example based on butadiene or isoprene), diene-vinyl block copolymer rubbers (for example based on butadiene and styrene blocks), copolymers of diene rubbers with further copolymerizable monomers (for example according to B 1.1.1 and B.1.2) and mixtures of the abovementioned types of rubber. Especially preferred are pure polybutadiene rubber and styrene-butadiene block copolymer rubber. The gel fraction of the graft polymers is at least 40% by weight, preferably at least 60% by weight, particularly preferably at least 75% by weight (measured in acetone).

The gel content of the graft polymers, unless otherwise stated in the present invention, determined at 25 ° C as insoluble in acetone as a solvent insoluble fraction (M. Hoffmann, H. Krömer, R. Kuhn, polymer analysis I and II, Georg Thieme-Verlag, Stuttgart 1977). The graft polymers B 1 are prepared by free-radical polymerization.

The graft polymer B 1 includes production-related generally free, ie not chemically bound to the rubber base copolymer of B 1.1.1 and B l .1.2, which is characterized in that it can be dissolved in suitable solvents (eg acetone). Component Bl preferably contains a free copolymer of B 1.1.1 and B1.1.2, which has a weight-average molecular weight (Mw), determined by gel permeation chromatography using polystyrene as standard, of preferably 30,000 to 150,000 g / mol, particularly preferably 40,000 to 120,000 g / mol. Component B2

As component B2, the compositions according to the invention may optionally contain graft polymers prepared by the bulk, solution or suspension polymerization process. In a preferred embodiment, these are graft polymers of

B2.1) 5 to 95 wt .-%, preferably 80 to 93 wt .-%, particularly preferably 85 to 92 wt .-%, most preferably 87 to 93 wt .-%, based on the component B2, of a mixture out

B2.1.1) 65 to 85 wt .-%, preferably 70 to 80 wt .-%, based on the mixture B.2.1, at least one monomer selected from the group of vinyl aromatics (such as styrene, a-methyl styrene), ring-substituted vinyl aromatic (such as p-methylstyrene, p-chlorostyrene) and methacrylic acid (C1-C8) alkyl esters (such as methyl methacrylate, ethyl methacrylate) and

B2.1.2) 15 to 35 wt .-%, preferably 20 to 30 wt .-% based on the mixture B2.1, at least one monomer selected from the group of vinyl cyanides (such as unsaturated nitriles such as acrylonitrile and methacrylonitrile), (Meth ) Acrylic acid (C 1 -C 8) -alkyl esters (such as methyl methacrylate, n-butyl acrylate, tert-butyl acrylate) and derivatives (such as anhydrides and imides) of unsaturated carboxylic acids (for example, maleic anhydride and N-phenyl-maleimide)

B2.2) 95 to 5 wt .-%, preferably 20 to 7 wt .-%, particularly preferably 15 to 8 wt .-%, most preferably 13 to 7 wt .-%, based on the component B2, at least one graft. The graft base preferably has a glass transition temperature <0 ° C, preferably <-20 ° C, more preferably <-60 ° C. The graft particles in component B2 preferably have an average particle size (D50 value) of from 0.1 to 10 μm, preferably from 0.2 to 2 μm, particularly preferably from 0.3 to 1.0 μm, very particularly preferably from 0 , 3 to 0.6 μιη on.

Preferred monomers B2.1.1 are selected from at least one of the monomers styrene, α-methylstyrene and methyl methacrylate, preferred monomers B2.1.2 are selected from at least one of the monomers acrylonitrile, maleic anhydride and methyl methacrylate.

Particularly preferred monomers are B2.1.1 styrene and B2.1.2 acrylonitrile.

Suitable graft bases B2.2 for the graft polymers B2 are, for example, diene rubbers, diene-vinyl block copolymer rubbers, EP (D) M rubbers, ie those based on ethylene / propylene and optionally diene, acrylate, polyurethane, silicone, Chloroprene and ethylene / vinyl acetate rubbers and mixtures of such rubbers or silicone-acrylate composite rubbers in which the silicone and acrylate components are chemically linked to one another (eg by grafting).

Preferred graft bases B2.2 are diene rubbers (for example based on butadiene or isoprene), diene-vinyl block copolymer rubbers (for example based on butadiene and styrene blocks), copolymers of diene rubbers with further copolymerizable monomers (for example according to B2.1.1 and B2 .1.2) and mixtures of the aforementioned rubber types. Particularly preferred as the graft base B2.2 are styrene-butadiene block copolymer rubbers and mixtures of styrene-butadiene block copolymer rubbers with pure polybutadiene rubber. The gel content of the graft polymers B2 is preferably 10 to 35 wt .-%, more preferably 15 to 30 wt .-%, most preferably 17 to 23 wt .-% (measured in acetone).

Particularly preferred polymers B2 are e.g. ABS polymers prepared by free-radical polymerization, which in a preferred embodiment up to 10 wt .-%, particularly preferably up to 5 wt .-%, particularly preferably 2 to 5 wt .-%, each based on the graft polymer B2, at n- Butyl acrylate included.

The graft polymer B2 generally comprises free from production, ie not chemically bound to the rubber base copolymer of B2.1.1 and B2.1.2, which is characterized in that it can be dissolved in suitable solvents (eg acetone). Component B2 preferably contains free copolymer of B2.1.1 and B2.1.2 which has a weight-average molecular weight (Mw), determined by gel permeation chromatography using polystyrene as standard, of preferably 50,000 to 200,000 g / mol, particularly preferably 70,000 to 150,000 g / mol , more preferably from 80,000 to 120,000 g / mol. Component B3

The composition may contain, as further component B3, optionally (co) polymers of at least one monomer from the group of vinylaromatics, vinyl cyanides (unsaturated nitriles), (meth) acrylic acid (C1 to C8) alkyl esters, unsaturated carboxylic acids and derivatives (such as anhydrides and Imide) unsaturated carboxylic acids. Particularly suitable as component B3 are (co) polymers of

B3.1 50 to 99 wt .-%, preferably 65 to 85 wt .-%, particularly preferably 70 to 80 wt .-% based on the (co) polymer B3 at least one monomer selected from the group of vinyl aromatics (such as styrene , α-methylstyrene), ring-substituted vinylaromatics (such as p-methylstyrene, p-chlorostyrene) and (meth) acrylic acid (C 1 -C 8) -alkyl esters (such as methyl methacrylate, n-butyl acrylate, tert-butyl acrylate) and

B3.2 1 to 50 wt .-%, preferably 15 to 35 wt .-%, particularly preferably 20 to 30 wt .-% based on the (co) polymer B3 at least one monomer selected from the group of vinyl cyanides (such as unsaturated Nitriles such as acrylonitrile and methacrylonitrile), (meth) acrylic acid (C 1 -C 8) alkyl esters (such as methyl methacrylate, n-butyl acrylate, tert-butyl acrylate), unsaturated carboxylic acids and derivatives of unsaturated carboxylic acids (eg maleic anhydride and N-phenyl-maleimide ).

These (co) polymers B3 are resinous, thermoplastic and rubber-free. Particularly preferred is the copolymer of B3.1 styrene and B3.2 acrylonitrile.

Such (co) polymers B3 are known and can be prepared by free-radical polymerization, in particular by emulsion, suspension, solution or bulk polymerization.

The (co) polymers B3 have a weight-average molecular weight (Mw), determined by gel permeation chromatography with polystyrene as standard, of preferably 50,000 to 200,000 g / mol, more preferably from 70,000 to 150,000 g / mol, particularly preferably from 80,000 to 130,000 g / mol , Component C

The composition may optionally further contain commercially available polymer additives as component C.

Commercially available polymer additives according to component C are additives such as flame retardants (for example phosphorus or halogen compounds), flame retardant synergists (for example nanoscale metal oxides), smoke-inhibiting additives (for example boric acid or borates), antidripping agents (for example compounds of the substance classes of fluorinated polyolefins, silicones and aramid fibers) internal and external lubricants and mold release agents (for example, pentaerythritol tetrastearate, montan wax or polyethylene wax), flow aids (for example low molecular weight vinyl (co) polymers), antistatics (for example block copolymers of ethylene oxide and propylene oxide, other polyethers or Polyhydroxyethers, poletheramides, polyesteramides or sulphonic acid salts), conductivity additives (eg carbon black or carbon nanotubes), stabilizers (for example UV / light stabilizers, heat stabilizers, antioxidants, transesterification hibitors, anti-hydrolysis agents), antibacterial additives (for example silver or silver salts), scratch-resistance-improving additives (for example silicone oils or hard fillers such as ceramic (hollow) spheres or quartz powder), IR absorbents, optical brighteners, fluorescent additives, fillers and reinforcing agents (e.g. Talc, ground glass or carbon fibers, glass or ceramic (hollow) spheres, mica, kaolin, CaCCb and glass flakes), acids and dyes and pigments (such as carbon black, titanium dioxide or iron oxide), or mixtures of several of these additives in question.

In a preferred embodiment, the compositions according to the invention contain as component C at least one component each selected from the group of mold release agents and stabilizers. In a particularly preferred embodiment, pentaerythritol tetrastearate is used as the mold release agent. In a particularly preferred embodiment, the stabilizer used is at least one compound selected from the group of sterically hindered phenols, organic phosphites and Bronsted acid compounds.

As component C, the compositions according to the invention may in particular also contain flame retardants, for example halogenated organic compounds or phosphorus-containing flame retardants. The latter are preferably used. Phosphorus-containing flame retardants in the sense of the invention are preferably selected from the groups of mono- and oligomeric phosphoric and phosphonic acid esters, phosphonateamines and Phosphazenes, whereby mixtures of several compounds selected from one or more of these groups can be used as flame retardants. Other halogen-free phosphorus compounds not specifically mentioned here can also be used alone or in any combination with other halogen-free phosphorus compounds. Preferred mono- and oligomeric phosphoric or phosphonic acid esters are phosphorus compounds of the general formula (IV)

wherein

R 1, R 2, R 3 and R 4, each independently of the other optionally halogenated C 1 to C 8 alkyl, in each case optionally substituted by alkyl, preferably C 1 to C 4 alkyl, and / or halogen, preferably chlorine, bromine, substituted C 5 to C 6 cycloalkyl, C 6 to C20 aryl or C7 to C12 aralkyl, n independently, 0 or 1 q 0 to 30 and

X is a mononuclear or polynuclear aromatic radical having 6 to 30 C atoms, or a linear or branched aliphatic radical having 2 to 30 C atoms, which may be OH-substituted and up to 8

May contain ether bonds.

Preferably, R 1, R 2, R 3 and R 4 independently of one another are C 1 - to C 4 -alkyl, phenyl, naphthyl or phenyl-C 1 -C 4 -alkyl. The aromatic groups R 1, R 2, R 3 and R 4 may in turn be substituted by halogen and / or alkyl groups, preferably chlorine, bromine and / or C 1 to C 4 alkyl. Particularly preferred aryl radicals are cresyl, phenyl, xylenyl, propylphenyl or butylphenyl and the corresponding brominated and chlorinated derivatives thereof.

X in the formula (IV) is preferably a mononuclear or polynuclear aromatic radical having 6 to 30 carbon atoms. This is preferably derived from diphenols of the formula (I). in the formula (IV), independently of each other, may be 0 or 1, preferably n is equal to 1. q is from 0 to 30. When mixtures of different components of the formula (IV) are used, mixtures may preferably have number average q values of 0.3 to 10, particularly preferably 0.5 to 10, in particular 1.05 to 1.4 be used.

X is particularly preferred for

or their chlorinated or brominated derivatives, in particular, X is derived from resorcinol, hydroquinone, bisphenol A or diphenylphenol. X is particularly preferably derived from bisphenol A.

The use of oligomeric phosphoric acid esters of the formula (IV) derived from bisphenol A is particularly advantageous, since the compositions equipped with this phosphorus compound have a particularly high resistance to stress cracking and hydrolysis and a particularly low tendency to form deposits in the injection molding process. Furthermore, a particularly high heat resistance can be achieved with these flame retardants.

Component C according to the invention can be monophosphates (q = 0), oligophosphates (q = l-30) or mixtures of mono- and oligophosphates.

Monophosphorus compounds of the formula (IV) are in particular tributyl phosphate, tris (2-chloroethyl) phosphate, tris (2,3-dibromopropyl) phosphate, triphenyl phosphate, tricresyl phosphate, diphenyl cresyl phosphate, diphenyl octyl phosphate, diphenyl 2-ethyl cresyl phosphate, tri (isopropyl - phenyl) -phosphate, halogen-substituted aryl phosphates, dimethyl methylphosphonate, diphenyl methylphosphinate, diethyl phenylphosphonate, triphenylphosphine oxide or tricresylphosphine oxide.

The phosphorus compounds of the formula (IV) are known (cf., for example, EP-A 363 608, EP-A 640 655) or can be prepared analogously by known methods (eg Ullmanns Enzyklopadie der technischen Chemie, Vol ff. 1979; Houben-Weyl, Methods of Organic Chemistry, Vol. 12/1, p. 43; Beilstein, Vol. 6, p. 177). The mean q values can be determined by determining the composition of the phosphate mixture (molecular weight distribution) using a suitable method (gas chromatography (GC), high pressure liquid chromatography (HPLC), gel permeation chromatography (GPC)) and calculating the mean values for q become.

Phosphonatamines are preferably compounds of the formula (V)

A3-y-NBly (V) in which

A is a radical of the formula (Va)

or (Vb)

stands,

R 1 and R 12 independently of one another are unsubstituted or substituted C 1 -C 10 -O-alkyl or unsubstituted or substituted C 6 to C 10 -aryl,

R 13 and R 14 independently of one another are unsubstituted or substituted C 1 to C 10 -alkyl or unsubstituted or substituted C 6 to C 10 -aryl, or

R 13 and R 14 together represent unsubstituted or substituted C 3 to C 10 -alkylene, y are the numerical values 0, 1 or 2 and

Bl independently represents hydrogen, optionally halogenated C 2 to C 8 alkyl, unsubstituted or substituted C 6 to C 20 aryl. Bl is preferably independently hydrogen, ethyl, n- or iso-propyl, which may be substituted by halogen, unsubstituted or substituted by C1 to C4 alkyl and / or halogen C6 to C10 aryl, in particular phenyl or naphthyl.

Alkyl in RH, R12, R13 and R14 is preferably independently methyl, ethyl, n-propyl, iso-propyl, n-, iso-, sec. or tert-butyl, pentyl or hexyl.

Substituted alkyl in RH, R12, R13 and R14 independently is preferably C1 to C1O alkyl substituted by halogen, especially mono- or di-substituted methyl, ethyl, n-propyl, iso-propyl, n-, iso-, sec. or tert-butyl, pentyl or hexyl.

C6 to C10 aryl in R, R12, R13 and R14 is preferably, independently of one another, phenyl, naphthyl or binaphthyl, in particular o-phenyl, o-naphthyl or o-binaphthyl, which is represented by halogen (generally one, two or three times) may be substituted.

R13 and R14 together with the oxygen atoms to which they are directly attached and the phosphorus atom can form a ring structure.

By way of example and by way of preference: 5,5,5 ', 5', 5 ", 5" -hexamethyltris (l, 3,2-dioxaphosphorinan-methane) amino-2,2 ', 2 "-trioxide of the formula (VIIa) 1)

1, 3,2-dioxaphosphorinane-2-methanamine, N-butyl-N [(5,5-dimethyl-1,3,2-dioxaphosphorinan-2-yl) methyl] -5, 5-dimethyl, P, 2 dioxides; 1, 3, 2-dioxaphosphorinane-2-methanamine, N- [[5 "5-dimethyl-1,3,2-dioxaphosphorinan-2-yl) methyl] -5, 5-dimethyl-N-phenyl, P, 2-dioxide; 1, 3, 2-dioxaphosphorinan-2-methanamine, N, N-dibutyl-5,5-dimethyl, 2-oxide, l, 3,2-dioxaphosphorinane-2-methanimine, N - [(5,5-dimethyl - 1, 3, 2-dioxaphosphorinan-2-yl) methyl] -N-ethyl-5, 5 -dimethyl-, P, 2-dioxide, 1, 3, 2-dioxaphosphorinan-2-methanamine, N-butyl -N - [(5,5-dichloro-methyl-1,3,2-dioxaphosphorinan-2-yl) -methyl] -5,5-di-chloromethyl, P, 2-dioxide, 1, 3, 2-dioxaphosphorinane 2-Methanamine, N - [(5,5-di-chloromethyl-1,3,2-dioxoaphosphorinan-2-yl) methyl] -5,5-di-chloromethyl-N-phenyl, P, 2-dioxide; 1, 3, 2

Dioxaphosphorinan-2-methanamine, N, N-di- (4-chlorobutyl) -5,5-dimethyl-2-oxide; 1, 3, 2

Dioxaphosphorinan-2-methanimine, N - [(5,5-dimethyl-1,3,2-dioxaphosphorinan-2-yl) methane] -N- (2-chloroethyl) -5,5-di (chloromethyl) -, P2 dioxide. Preference is furthermore given to:

Compounds of the formula (Va-2) or (Va-3)

in which

RH, R12, R13 and R14 have the meanings given above.

Particular preference is given to compounds of the formula (Va-2) and (Va-1). The preparation of the phosphonatamines is described, for example, in US Pat. No. 5,844,028.

Phosphazenes are compounds of the formulas (Via) and (VIb)

wherein Each R is the same or different and is amino, in each case optionally halogenated, preferably fluorine-halogenated C 1 to C 8 alkyl, or C 1 to C 8 alkoxy, in each case optionally by alkyl, preferably C 1 to C 4 alkyl, and / or halogen, preferably chlorine and / or bromine, substituted C5 to C6-cycloalkyl, C6 to C20-aryl, preferably phenyl or naphthyl, C6 to C20-aryloxy, preferably phenoxy, naphthyloxy, or C7 to C12-aralkyl, preferably phenyl

C1-C4-alkyl, k is 0 or a number from 1 to 15, preferably a number from 1 to 10.

Examples which may be mentioned are propoxyphosphazene, phenoxyphosphazene, methylphenoxyphosphazene, aminophosphazene and fluoroalkylphosphazenes. Preferred is phenoxyphosphazene. The phosphazenes can be used alone or as a mixture. The radical R may always be the same or 2 or more radicals in the formulas (VIa) and (VIb) may be different. Phosphazenes and their preparation are described for example in EP-A 728 811, DE-A 1 961668 and WO 97/40092.

The flame retardants can be used alone or in any mixture with each other or in admixture with other flame retardants.

In addition, flame retardant compositions in a preferred embodiment contain the aforementioned flame retardants in combination with at least one Antidrippingmittel selected from the substance classes of fluorinated polyolefins, the silicones and aramid fibers. Polytetrafluoroethylene polymers are particularly preferably used as anti-dripping agents. The molding compositions prepared by the process according to the invention can be used for the production of moldings of any kind. These can be produced by injection molding, extrusion and blow molding. Another form of processing is the production of moldings by deep drawing from previously prepared plates or films.

Examples of such moldings are films, profiles, housing parts of any kind, eg for household appliances such as juice presses, coffee machines, blenders; for office machines such as monitors, flat screens, notebooks, printers, copiers; Panels, pipes, electrical installation ducts, windows, doors and other profiles for the construction sector (interior and exterior applications) and electrical and electronic parts such as switches, plugs and sockets, as well as body and interior components for commercial vehicles, in particular for the automotive sector. In particular, the molding compositions prepared by the process according to the invention can also be used, for example, for the production of the following moldings or moldings: Interior components for rail vehicles, ships, aircraft, buses and other motor vehicles, housings of electrical appliances containing small transformers, housings for information processing and transmission equipment, housings and paneling of medical equipment, massage apparatus and housings therefor, toy vehicles for children, panel wall elements, enclosures for safety devices, heat-insulated transport containers, fittings for plumbing and bathing equipment, grilles for ventilation openings and housings for garden tools.

The molding compositions prepared by the process according to the invention are also particularly suitable for the production of moldings or moldings with Class A surface requirement and high gloss finish, which optionally partially or completely another surface treatment step by, for example, painting, foil rear injection, metallization by vacuum evaporation or galvanization were subjected.

For the purposes of the present invention, "glossy" is understood as meaning a degree of reflection in accordance with DIN 67530 at a measurement angle of 60 ° of at least 95, preferably of at least 97, more preferably of at least 99. The invention thus also relates to molded articles or molded articles the full or partial high gloss finish compositions according to the invention which have optionally been partially or completely subjected to a further surface treatment step by, for example, painting, curtain coating, metallization by vacuum deposition or electroplating.

The invention thus also provides moldings or moldings produced from the compositions by the process according to the invention with a complete or partially high-gloss finish, which have optionally been partially or completely subjected to a further surface treatment step by, for example, painting, curtain coating, metallization by vacuum evaporation or electroplating.

Examples Component AI

Linear polycarbonate based on bisphenol A having a weight-average molecular weight M _w of 28 kg / mol (determined by GPC in methylene chloride at 25 ° C. with polycarbonate as standard). Component Bl

Precompound, in the form of granules, of 50% by weight of an ABS-type graft polymer prepared in the emulsion polymerization process, having an A: B: S ratio of 12:50:38% by weight and 50% by weight of a styrene Acrylonitrile copolymer prepared by the bulk polymerization method having a styrene-acrylonitrile ratio of 76:24 wt% and having a weight average molecular weight M _w of 100 kg / mol as measured by GPC with polystyrene as a standard in dimethylformamide at 20 ° C. Component B 1 contains 900 mg / kg of the precipitant magnesium sulfate used in the coagulation of the graft polymer. According to detection by scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDX), this magnesium sulfate is present in crystalline domains with a dimension of up to more than 100 μm.

The determination of the magnesium sulfate content in component B l was carried out by a quantitative determination of the sulfate ion content and its conversion to magnesium sulfate, since a determination from the magnesium content is not possible due to lack of selectivity to MgSCu. For this purpose, about 1 g of component Bl was accurately weighed, with 25 ml of acetone, p.A. treated and the mixture treated for 30 minutes in an ultrasonic bath. The resulting suspension was made up to 200 ml with millipore water and shaken through. The suspension thus treated was membrane filtered. The sulfate ion content was determined in the filtrate by ion chromatography using a DIONEX DX 600 ion chromatograph (DIONEX) (separation column: IonPac AS 11, 4x250 mm (DIONEX) mobile phase: gradient NaOH, c = 0.004 / 0.076 mol / L Flow rate: 1.8 ml / min; autosampler temperature: 23 ° C; column temperature: 35 ° C;

Suppression: electrochemical, ASRS 300, 4mm; Detection: conductivity). Component B2 ABS-type n-butyl acrylate-modified graft polymer is obtained in the mass polymerisation process with an A: B: S ratio of 21: 10: 65% by weight and with a n-butyl acrylate content of 4% by weight. %. The D50 value of the graft particle diameter determined by ultracentrifugation is 0.5 μm. The graft base on which the graft polymer is based is a styrene-butadiene block copolymer rubber (SBR). The gel content of the graft polymer measured in acetone is 20% by weight. The weight average molecular weight M _{w of} the free, ie not chemically bound to the rubber or included in the rubber particles in acetone insoluble form for acetone by GPC with polystyrene as standard in dimethylformamide at 20 ° C is 110 kg / mol ,

Component B3

A styrene-acrylonitrile copolymer prepared by a mass polymerization method having a styrene-acrylonitrile ratio of 76:24% by weight and having a weight-average molecular weight M _w of 100 kg / mol as measured by GPC with polystyrene as a standard in dimethylformamide at 20 ° C , Component Cl

Pentaerythritol tetrastearate as slip / release agent component C2

Phosphorus acetate of bis (2-hydroxy-3-cyclohexyl-5-methyl-phenyl) -methane having the formula

Component C3

Thermostabilizer, Irganox 1076, BASF (Ludwigshafen, Germany)

The compositions of the examples and comparative examples VI, 2, 3, 4, 5, 6, 7, 8, 9 and 10 listed in Table 1 all contain 60.35 parts by weight of component Al

23.16. Parts of component Bl

8.90 parts by weight of component B2

6.53. Parts of component B3

0.74 parts by weight of component Cl 0.12 parts by weight of component C2

0.20 parts by weight of component C3 and differ only in the method used for the preparation.

Preparation of the compositions and testing

 The preparation of the compositions VI, 2, 3, 4, 5, 6, 7, 8, 9 and 10 was carried out on a

Twin-screw extruder ZSK25WLE from Coperion with a ratio of length to diameter L / D = 48 at a melt temperature of 260 to 270 ° C and under vacuum degassing at a pressure of 70 mbar (absolute).

The component Bl was used untreated (VI) and moistened for 30 seconds by immersion in water (2-10). Moistening took place in a water-filled vessel at 25 ° C. The moistened granules were subsequently screened off and

moist surface stored for a predetermined time in a bag. In Examples 2 and 6, after storage, the granules were surface wetted in the final compounding step. In Examples 3, 4, 7, 8, 9 and 10, the granules were subsequently dried in a circulating air drying cabinet at 50 ° C. for a specific time. In Example 5, the granules were following the Storage still dried for 72 h on a plate at 25 ° C. Details for storage and for

Post-treatment of the granules can be taken from Table 1. In cases where the granules were dried after storage, the granules were surface-dry and were thus used in the final compounding step.

The granules resulting from the respective compounding were processed on an injection molding machine (Arburg) at melt temperatures of 260 ° C. and a mold temperature of 80 ° C. to give plates of dimensions 150 mm × 105 mm × 2 mm. Here, a highly polished tool was used. These plates were exposed for 3 days at 40 ° C to an air atmosphere with a relative humidity of 95%. This was followed by a visual assessment by 3 independent experts according to the following evaluation basis:

++ no bubbles or only occasional very small bubbles

+ some very small, not yet annoying bubbles many very small bubbles and / or only a few larger bubbles many larger bubbles

Table 1: Examples

 Method vi 2 3 4 5 6 7 8 9 10

According to the invention X X X X X X X X X

Short humidification X X X X X X X X X in water (30 s at 25 ° C)

 Storage of wet X X X X X X X X X

 - Granules

 Temperature at the 25 25 25 25 25 25 25 25 Storage PCI

Duration of - 24 24 24 24 72 72 72 72 72 Storage | ^" hl

Follow-up - - XX ¹ - XXXX in a convection oven

Reprocessing - - ^{1 1} X - - - - ¹ Drying on metal

 Temperature at the 50 50 25 50 50 50 50 aftertreatment TCl

 Duration of - - 0.25 4 72 - 0.08 0.25 1 4

After-treatment [h]

 properties

visual evaluation z z + + ± + + + +

Claims

claims

A process for the preparation of compositions containing

A) 0 to 98 parts by weight, based on the sum of A and B, of one or a mixture of a plurality of thermoplastic polymers other than B and

B) 2 to 100 parts by weight, based on the sum of A and B, from

B l) at least one graft polymer prepared in the emulsion polymerization process,

 B2) optionally at least one in the bulk, suspension or

Lösungspolymeriationsverfahren prepared graft polymer,

 B3) optionally at least one rubber-free vinyl (co) polymer, and

C) 0 to 30 parts by weight, based on the sum of A and B, of at least one commercially available polymer additive, the sum of the parts by weight A and B adding up to 100,

the component B, preferably the component Bl or a pre-compound of component Bl with at least one of the components B2 and B3 or with a subset of at least one of the components B2 and B3, more preferably a pre-compound of component B l and the total or a subset of Component B3, at least one inorganic salt consisting of a cation selected from the group of alkali metals, alkaline earth metals and aluminum and an anion selected from the group consisting of chloride, sulfate, nitrate, phosphate, acetate and formate, in a concentration of the salt or Salt mixture of 100 to 5000 mg / kg, preferably from 150 to 2000 mg / kg, more preferably from 200 to 1000 mg / kg, based on the composition, and characterized in that a) in a first process step, the entire (n) the salt-containing component (s) of B, optionally with part or all of the remaining components B, A and C are processed in a compounding unit, preferably an extruder, to a polymer blend, then this polymer melt is discharged from the extruder and in the form of polymer strands before granulation or alternatively in the form of granules after granulation completely by contact with liquid water b) in a second process step, the thus treated with water granules of not adhering to the surface of the granules water is separated and then stored surface moist, c) in a third step, the so moist stored granules are melted and kneaded in the molten state and / or d) in a fourth process, the thus prepared component with the remaining components of the composition mixed, the mixture remelted, kneaded and the components The mixture are thereby dispersed in each other, wherein at least in one of steps c) or d) a negative pressure of preferably at least 200 mbar, more preferably of at least 500 mbar, more preferably of at least 800 mbar is applied and thereby in the process step a) in the process introduced water is removed again from the product, and wherein the mean storage time of the surface wet granules in step b) is preferably at least 24 h.

A method according to claim 1, characterized in that the component B 1

Bl .1) 5 to 95 wt .-%, based on the component B 1, a mixture of

Bl .1.1) 65 to 85 wt .-%, based on Bl .l, of at least one monomer selected from the group consisting of styrene, α-methylstyrene and methyl methacrylate, and

Bl .l .2) 15 to 35 wt .-%, based on Bl .l, of at least one monomer selected from the group consisting of acrylonitrile, maleic anhydride and methyl methacrylate, and

B1.2) 95 to 5 wt .-%, based on the component B l, at least one elastomeric graft, vorzugswei se selected from the group b consisting of polybutadiene rubber and styrene-butadiene block copolymer rubber contains.

A method according to claim 1 or 2, characterized in that the component Bl contains the inorganic salt as a production-related impurity.

Method according to one of the preceding claims, characterized in that the residence time of the strands or granules in the water bath in step a) is between 1 second and 60 minutes, preferably between 2 seconds and 10 minutes, more preferably between 3 seconds and 60 seconds.

Method according to one of the preceding claims, characterized in that the application of liquid water in step a) in the temperature range of 5 to 95 ° C, preferably from 10 to 90 ° C, particularly preferably from 20 to 85 ° C.

Method according to one of the preceding claims, characterized in that the amount of water of the surface moist granules at least 1 wt .-% and at most 30 wt .-% based on the sum of water and granules.

Method according to one of the preceding claims, characterized in that the method step b) is operated continuously.

Method according to one of the preceding claims, characterized in that the method step b) is operated discontinuously.

Method according to one of the preceding claims, characterized in that the storage time in step b) at least 24h, preferably 48h, more preferably 72 h.

Method according to one of the preceding claims, characterized in that the storage according to process step b) is followed by a further process step for the separation of the superficial water from the discharged granules.

11. The method according to any one of the preceding claims, characterized in that the application of liquid water in step a) and storage of the wet granules in step b) in the temperature range of 5 to 95 ° C, preferably from 10 to 90 ° C, particularly preferred from 20 to 85 ° C takes place.

12. The method according to any one of the preceding claims, characterized in that the salt-containing component (s) B are present as granules.

13. The method according to any one of the preceding claims, characterized in that the compositions contain

A) 30 to 85 parts by weight, based on the sum of A and B,

B) 15 to 70 parts by weight, based on the sum of A and B,

C) 0.3 to 7 parts by weight, based on the sum of A and B.

14. The method according to any one of the preceding claims, characterized in that the salt is an alkali, alkaline earth or aluminum chloride or an alkali, alkaline earth or aluminum sulfate, preferably magnesium sulfate, or a mixture thereof.

15. The method according to any one of the preceding claims, characterized in that the composition as component C at least one member selected from the group consisting of flame retardants, Flammschutzsynergisten, smoke-inhibiting additives, anti-dripping, internal and external lubricants and mold release agents, flowability aids, antistatic agents, Conductivity additives, UV stabilizers, light stabilizers, thermal stabilizers, antioxidants, transesterification inhibitors, anti-hydrolysis, antibacterial additives, scratch-resistant additives, IR absorbents, optical brighteners, fluorescent additives, fillers and reinforcing agents, acids and dyes and pigments contains.

16. A composition prepared by a process according to any one of claims 1 to 15.

17. A molded article or molded article of a polymer composition prepared by a process of claims 1 to 15 having a Class A surface and a partial or complete high gloss finish characterized by a gloss level in these high gloss ranges of at least 95 determined in reflection according to DIN 67530 at a measuring angle of 60 °, which may optionally be partially or completely subjected to a further surface treatment step by, for example, painting, film backing, metallization by vacuum evaporation or galvanization.

Shaped bodies or moldings according to claim 17, which after a wet heat treatment has no bubbles with a diameter of greater than 300 μιη and with a relative area of defects with bubble topography based on the examined surface area (A _re i) of less than 50 ppm ,