Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L55/00—Compositions of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08L23/00 - C08L53/00
  • C08L55/02—ABS [Acrylonitrile-Butadiene-Styrene] polymers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F279/00—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00
  • C08F279/02—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00 on to polymers of conjugated dienes
  • C08F279/04—Vinyl aromatic monomers and nitriles as the only monomers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F2/00—Processes of polymerisation
  • C08F2/12—Polymerisation in non-solvents
  • C08F2/16—Aqueous medium
  • C08F2/22—Emulsion polymerisation
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
  • C08L25/02—Homopolymers or copolymers of hydrocarbons
  • C08L25/04—Homopolymers or copolymers of styrene
  • C08L25/08—Copolymers of styrene
  • C08L25/12—Copolymers of styrene with unsaturated nitriles
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2300/00—Characterised by the use of unspecified polymers
  • C08J2300/22—Thermoplastic resins

Definitions

• the invention relates to thermoplastic molding compositions of the ABS type containing special, highly effective graft polymer components which are obtained by emulsion polymerization using special initiator systems and compliance with defined reaction conditions.
• ABS-type molding compounds are made of two-phase plastics
• thermoplastic copolymer of styrene and acrylonitrile in which the styrene can be replaced in whole or in part by ⁇ -methylstyrene or methyl methacrylate; this copolymer, also known as SAN resin or matrix resin, forms the outer phase;
• graft polymer which has been prepared by grafting one or more of the monomers mentioned under I onto a butadiene, homo- or copolymer (“graft base”).
• This graft polymer (“elastomer phase” or “graft rubber”) forms the disperse
• the toughness of an ABS molding compound is essentially determined by the graft rubber.
• the toughness that can be achieved with conventional ABS molding compounds is not always sufficient for highly stressed molded parts with the necessary certainty, especially when very high toughness is required at low temperatures or these requirements are only at the expense of other properties that are also required, such as Hardness or processing behavior achieved.
• these graft rubbers should also be able to be produced on the basis of finely divided rubber bases, so that molded parts with a high surface gloss can be obtained if required.
• Fonts such as EP-A 745 623 describe the use of special redox systems or azo initiators.
• Such initiator systems lead to graft polymers which lead to good properties in thermoplastic molding compositions with special requirements, good toughness values at high and low temperatures while maintaining the others
• the graft polymer A) is prepared by feeding the monomers to the rubber latex, at the beginning of the graft polymerization reaction the special azo compound in amounts of 0.2 to 3% by weight, preferably 0.3 to 2.5% by weight % and particularly preferably from 0.5 to 2% by weight (in each case based on the monomers metered in until the point in time of the persulfate compound addition) is added, after an addition of monomers of 10 to 95% by weight, preferably 20 to 85% by weight , particularly preferably 20 to
• Suitable rubbers for producing the elastic-thermoplastic graft polymers according to the invention are in principle all rubber-like polymers in emulsion form with a glass transition temperature below 0 ° C.
• C atoms such as butadiene, isoprene, chloroprene or their copolymers with up to 60% by weight, preferably up to 30% by weight, of a vinyl monomer, e.g. Acrylonitrile, methacrylonitrile, styrene, ⁇ -methylstyrene, halostyrenes, CJ-C4-alkylstyrenes, Ci-Cg-alkyl acrylates, Ci-Cg-alkyl methacrylates, alkylene glycol diacrylates, alkylene glycol dimethacrylates, divinylbenzene;
• a vinyl monomer e.g. Acrylonitrile, methacrylonitrile, styrene, ⁇ -methylstyrene, halostyrenes, CJ-C4-alkylstyrenes, Ci-Cg-alkyl acrylates, Ci-Cg-alkyl methacrylates, alkylene glycol di
• Acrylate rubbers i.e. Homopolymers and copolymers of Ci-Cjo alkyl acrylates, e.g. Homopolymers of ethyl acrylate, butyl acrylate or copolymers with up to 40% by weight, preferably not more than 10% by weight, of mono-vinyl monomers, e.g. Styrene, acrylonitrile, vinyl butyl ether, acrylic acid (ester),
• mono-vinyl monomers e.g. Styrene, acrylonitrile, vinyl butyl ether, acrylic acid (ester)
• Methacrylic acid (ester), vinyl sulfonic acid.
• Acrylate rubber homo- or copolymers are preferably used which contain 0.01 to 8% by weight of divinyl or polyvinyl compounds and / or N-methylolacrylamide or N- Contain methylol methacrylamide or other compounds that act as crosslinkers, for example divinylbenzene, triallyl cyanurate.
• Polybutadiene rubbers SBR rubbers with up to 30% by weight of copolymerized styrene and acrylate rubbers are preferred, especially those which contain a core
• Latices with average particle diameters d5Q of 0.05 to 2.0 ⁇ m, preferably 0.08 to 1.0 ⁇ m and particularly preferably 0.1 to 0.5 ⁇ m are suitable for the preparation of the graft polymers according to the invention.
• the gel contents of the rubbers used can be varied within wide limits, preferably between 30 and 95% by weight (determination by the wire cage method in toluene (cf. Houben-Weyl, Methods of Organic Chemistry, Macromolecular Substances, Part 1, p. 307 (1961), Thieme Verlag Stuttgart)).
• the rubber latex (a) preferably has a width of the particle size distribution of 30 to 100 nm, particularly preferably 40 to 80 nm, of the rubber latex
• the mixtures contain the rubber latices (a) and (b) preferably in a weight ratio of 90:10 to 10:90, particularly preferably 60:40 to 30:70
• the mean particle diameters are determined by means of an ultracentrifuge (cf. W. Scholtan, H. Lange: Kolloid-Z. U Z. Polymer 250, pp. 782-796 (1972).
• the rubber latices used can be produced by emulsion polymerization; the necessary reaction conditions, auxiliary substances and working techniques are known in principle.
• the so-called seed polymerization technique can also be used, in which e.g. produced a finely divided butadiene polymer and then by
• anionic emulsifiers such as alkyl sulfates, alkyl sulfonates, aralkyl sulfonates, soaps of saturated or unsaturated fatty acids can be used as emulsifiers
• emulsifiers with carboxyl groups eg salts of C 10 -C 18 fatty acids, disproportionated abietic acid
• rubber polymer latices can also be produced by emulsifying finished rubber polymers in aqueous media (cf. Japanese patent application 55 125 102).
• Suitable graft monomers which are polymerized in the presence of the rubbery polymers present in emulsion form are virtually all compounds which can be polymerized in emulsion to give thermoplastic resins, e.g. Vinylaromatics of the formula (I) or compounds of the formula (II) or mixtures thereof,
• R is hydrogen or methyl
• R2 is hydrogen, halogen or alkyl having 1 to 4 carbon atoms in the ortho, meta or para position,
• R ⁇ is hydrogen or methyl
• X represents CN, R 4 OOC or R 5 R 6 NOC-,
• R4 is hydrogen or alkyl of 1 to 4 carbon atoms and R5 and R6 independently of one another are hydrogen, phenyl or alkyl having 1 to 4 carbon atoms.
• Examples of compounds of the formula (I) are styrene, ⁇ -methylstyrene, p-methylstyrene and vinyltoluene.
• Examples of compounds of the formula (II) are acrylonitrile and methyl methacrylate.
• Other suitable monomers are e.g. Vinyl acetate and N-phenylmaleimide.
• Preferred monomers are mixtures of styrene and acrylonitrile, ⁇ -methylstyrene and acrylonitrile, of styrene, acrylonitrile and methyl methacrylate and combinations of these monomer mixtures with N-phenylmaleimide.
• Preferred graft polymers A) according to the invention are those which by graft polymerization of styrene and acrylonitrile in a weight ratio of 90:10 to 50:50, preferably 80:20 to 65:35 (wherein styrene can be replaced in whole or in part by ⁇ -methylstyrene or Methyl methacrylate) in the presence of such amounts of rubber, preferably polybutadiene, that graft polymers with rubber contents of 20 to 80% by weight, preferably 30 to 75% by weight and particularly preferably 35 to 70% by weight result.
• the graft polymers A) are prepared in accordance with the invention in such a way that a special azo compound is added to the rubber latex or the rubber latex mixture at the start of the grafting reaction.
• Suitable azo compounds which are preferably suitable are those of the general formula
• the amounts of azo compound used are from 0.2 to 3% by weight, preferably from 0.3 to 2.5% by weight and particularly preferably from 0.5 to 2% by weight (in each case based on that up to the point in time) Added persulfate compound monomers).
• the graft monomers are then metered in and, after an addition amount of 10 to 95% by weight, preferably 20 to 85% by weight, particularly preferably 20 to 80% by weight, in particular 30 to 75% by weight, and very particularly preferably 35 to 70% by weight (based on the total amount of monomers in each case) is at least one persulfate compound in amounts of 0.05 to 1.5% by weight, preferably 0.08 to 1.2% by weight and particularly preferably 0 , 1 to 1.0% by weight (based in each case on the monomers metered in from the starting point of the persulfate compound addition).
• Suitable persulfate compounds are e.g. Sodium peroxodisulfate, potassium peroxodisulfate, ammonium peroxodisulfate, preferred persulfate compound is potassium peroxodisulfate.
• both the azo compound and the persulfate compound are used in the form of aqueous solutions, aqueous emulsions, aqueous suspensions or other aqueous dispersions.
• the remaining monomers are then metered in and the polymerization is completed.
• the invention further relates to the process for the production of graft rubbers, wherein
• the azo compound is added in amounts of 0.2 to 3% by weight (based on the monomers metered in until the persulfate compound is added)
• a persulfate compound is added in amounts of 0.05 to 1.5% by weight (based on the monomers metered in from the time the persulfate compound is added) and
• the reaction temperature in the preparation of the graft rubbers A) according to the invention can be varied within wide limits. It is 25 ° C to 160 ° C, preferred wise 40 ° C to 90 ° C; the temperature at the beginning of the monomer metering very particularly preferably differs from the temperature at the end of the monomer metering by a maximum of 20 ° C., preferably a maximum of 10 ° C. and particularly preferably a maximum of 5 ° C.
• molecular weight regulators can be used in the graft polymerization, preferably in amounts of 0.05 to 2% by weight, particularly preferably in amounts of 0.1 to 1% by weight (in each case based on the total amount of monomer).
• a preferred procedure according to the invention is the addition of molecular weight regulators only in the reaction section after the addition of the persulfate compound and the avoidance of any addition of regulators in the reaction section before the addition of the persulfate compound.
• Suitable molecular weight regulators are, for example, n-dodecyl mercaptan, t-
• the above-mentioned compounds can be used as emulsifiers in the graft polymerization reaction; emulsifiers with carboxyl groups are preferred.
• the graft rubber latex A) is worked up by known processes, for example by spray drying or by adding salts and or acids, washing the precipitated products and drying the powder.
• the vinyl resins B) used are preferably copolymers of styrene and acrylonitrile in a weight ratio of 90:10 to 50:50, it being possible for styrene and / or acrylonitrile to be replaced in whole or in part by ⁇ -methylstyrene and / or methyl methacrylate; optionally up to 30% by weight (based on vinyl resin) of another monomer from the series of maleic anhydride, maleimide, N-
• (Cyclo) alkyl maleimide N- (alkyl) phenyl maleimide can also be used.
• the weight average molecular weights (M w ) of these resins can be varied within wide limits, preferably they are between approximately 40,000 and 200,000, particularly preferably between 50,000 and 150,000.
• the proportion of the elastic-thermoplastic graft polymer (A) in the molding compositions according to the invention can be varied within wide limits; it is preferably 10 to 80% by weight, particularly preferably 20 to 75% by weight.
• the necessary or appropriate additives can be added to the molding compositions according to the invention during production, workup, further processing and final shaping, e.g. Antioxidants, UV stabilizers, peroxide destroyers, antistatic agents, lubricants, mold release agents, flame retardants, fillers or reinforcing materials (glass fibers, carbon fibers etc.) and colorants.
• Antioxidants e.g. UV stabilizers, peroxide destroyers, antistatic agents, lubricants, mold release agents, flame retardants, fillers or reinforcing materials (glass fibers, carbon fibers etc.) and colorants.
• the final deformation can be carried out on commercially available processing units and includes e.g. Injection molding, sheet extrusion with subsequent hot forming, cold forming, pipe and profile extrusion or calender processing.
• ABS-type molding compositions according to the invention can be mixed with other polymers.
• Suitable blend partners are, for example, selected from at least one polymer selected from the group of polycarbonates, polyesters, polyester carbonates and polyamides.
• Suitable thermoplastic polycarbonates and polyester carbonates are known (see, for example, DE-AS 1 495 626, DE-OS 2 232 877, DE-OS 2 703 376, DE-OS 2 714 544, DE-OS 3 000 610, DE-OS 3 832 396, DE-OS 3 077 934), for example can be prepared by reacting diphenols of the formulas (IV) and (V)
• A is a single bond, -CC-alkylene, C2-C5-alkylidene, C5-Cg-cycloalkyl-idene, -O-, -S-, -SO-, -SO - or -CO-,
• R ⁇ and R8 independently of one another represent hydrogen, methyl or halogen, in particular hydrogen, methyl, chlorine or bromine,
• R9 and RIO independently of one another are hydrogen, halogen preferably chlorine or bromine, Ci-Cg-alkyl, preferably methyl, ethyl, C5-C6-cycloalkyl, preferably cyclohexyl, Cg-Cio-aryl, preferably phenyl, or C7-C12-aralkyl, preferably Phenyl-C ] -C4-alkyl, in particular benzyl,
• n is 0 or 1
• RU and R 2 are individually selectable for each X 1 and independently of one another are hydrogen or C ⁇ -Cg-alkyl and
• X 1 means carbon
• carbonic acid halides preferably phosgene
• aromatic dicarboxylic acid dihalides preferably benzenedicarboxylic acid dihalides
• Phase boundary polycondensation or with phosgene by polycondensation in a homogeneous phase (the so-called pyridine process), the molecular weight being able to be adjusted in a known manner by an appropriate amount of known chain terminators.
• Suitable diphenols of the formulas (IV) and (V) are e.g. Hydroquinone, resorcinol, 4,4'-dihydroxydiphenyl, 2,2-bis (4-hydroxyphenyl) propane, 2,4-bis (4-hydroxyphenyl) -2-methylbutane, 2,2-bis ( 4-hydroxy-3,5-dimethylphenyl) propane, 2,2-bis (4-hydroxy-3,5-dichlorophenyl) propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) -pro- pan, l, l-bis- (4-hydroxyphenyl) -cyclohexane, l, l-bis- (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, 1, 1-bis (4- hydroxyphenyl) -3,3-dimethylcyclohexane, 1, 1-bis (4-hydroxyphenyl) -3,3,5,5-tetramethylcyclohexane or l, l
• Preferred diphenols of the formula (IV) are 2,2-bis (4-hydroxyphenyl) propane and l, l-bis (4-hydroxyphenyl) cyclohexane, preferred phenol of the formula (V) is 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane.
• Suitable chain terminators are, for example, phenol, p-tert-butylphenol, long-chain alkylphenols such as 4- (1,3-tetramethylbutyl) phenol according to DE-OS 2 842 005, monoalkylphenols, dialkylphenols with a total of 8 to 20 C- Atoms in the alkyl substituents according to DE-OS 3 506 472, such as p-nonylphenol, 2,5-di-tert-butylphenol, p-tert-octylphenol, p-dodecylphenol, 2- (3,5-dimethylheptyl) -phenol and 4- (3,5-dimethyl-heptyl) phenol.
• the amount of chain terminators required is generally 0.5 to 10 mol%, based on the sum of the diphenols (IV) and (V).
• the suitable polycarbonates or polyester carbonates can be linear or branched; branched products are preferred by incorporating from 0.05 to
• the suitable polycarbonates or polyester carbonates can contain aromatically bound halogen, preferably bromine and / or chlorine; they are preferably halogen-free.
• M w average molecular weights
• Suitable thermoplastic polyesters are preferably polyalkylene terephthalates, i.e. reaction products made from aromatic dicarboxylic acids or their reactive derivatives (e.g. dimethyl esters or anhydrides) and aliphatic, cycloaliphatic or arylaliphatic diols and mixtures of such reaction products.
• polyalkylene terephthalates i.e. reaction products made from aromatic dicarboxylic acids or their reactive derivatives (e.g. dimethyl esters or anhydrides) and aliphatic, cycloaliphatic or arylaliphatic diols and mixtures of such reaction products.
• Preferred polyalkylene terephthalates can be prepared from terephthalic acids (or their reactive derivatives) and aliphatic or cycloaliphatic diols with 2 produce up to 10 carbon atoms by known methods (Kunststoff-Handbuch-, Volume VIII, p. 695 ff, Carl Hanser Verlag, Kunststoff 1973).
• 80 to 100 preferably 90 to 100 mol% of the dicarboxylic acid residues, terephthalic acid residues and 80 to 100, preferably 90 to 100 mol% of the diol residues are 1,4-ethylene glycol and / or butanediol residues.
• the preferred polyalkylene terephthalates can contain, in addition to ethylene glycol or butanediol 1,4, residues from 0 to 20 mol% of residues of other aliphatic diols with 3 to 12 C atoms or cycloaliphatic diols with 6 to 12 C atoms, e.g.
• the polyalkylene terephthalates can be branched by incorporating relatively small amounts of trihydric or tetravalent alcohols or trihydric or tetravalent carboxylic acids, as described in DE-OS 1 900 270 and US Pat. No. 3,692,744.
• preferred branching agents are trimesic acid, trimellitic acid, trimethyl olethane and propane and pentaerythritol. It is advisable not to use more than 1 mol% of the branching agent, based on the acid component.
• polyalkylene terephthalates which have been prepared solely from terephthalic acid and its reactive derivatives (for example its dialkyl esters) and ethylene glycol and / or 1,4-butanediol and mixtures of these polyalkylene terephthalates.
• Preferred polyalkylene terephthalates are also copolyesters which are made from at least two of the alcohol components mentioned above: particularly preferred copolyesters are poly (ethylene glycol butanediol 1,4) terephthalates.
• the preferably suitable polyalkylene terephthalates generally have one
• Suitable polyamides are known homopolyamides, copolyamides and mixtures of these polyamides. These can be partially crystalline and / or amorphous polyamides.
• Polyamide-6, polyamide-6,6, mixtures and corresponding copolymers of these components are suitable as partially crystalline polyamides.
• Semi-crystalline polyamides are also suitable, the acid components of which are wholly or partly composed
• Terephthalic acid and / or isophthalic acid and / or suberic acid and / or sebacic acid and / or azelaic acid and / or adipic acid and / or cyclohexanedicarboxylic acid the diamine component wholly or partly of m- and / or p-xylylenediamine and or hexamethylenediamine and / or 2, 2,4-trimethylhexamethylenediamine and / or 2,2,4-trimethylhexamethylenediamine and / or isophoronediamine and the composition of which is known in principle.
• polyamides which are wholly or partly prepared from lactams with 7- 12 C atoms in the ring, optionally with the use of one or more of the above-mentioned starting components.
• Particularly preferred partially crystalline polyamides are polyamide 6 and polyamide 6,6 and their mixtures.
• Known products can be used as amorphous polyamides. They are obtained by polycondensation of diamines such as ethylenediamine, hexamethylenediamine, decamethylenediamine, 2,2,4- and / or 2,4,4-trimethylhexamethylenediamine, m- and / or p-xylylenediamine, bis- (4th -aminocyclo- hexyl) methane, bis- (4-aminocyclohexyl) propane, 3,3'-dimethyl-4,4'-diamino-di-cyclohexylmethane, 3-aminomethyl, 3,5,5, -trimethylcyclohexylamine, 2,5- and / or 2,6-bis (aminomethyl) norbornane and / or 1,4-diaminomethylcyclohexane with dicarboxylic acids
• Copolymers which are obtained by polycondensation of several monomers are also suitable, furthermore copolymers which, with the addition of aminocarboxylic acids such as ⁇ -aminocaproic acid, ⁇ -aminoundecanoic acid or ⁇ -aminolauric acid or their
• Particularly suitable amorphous polyamides are the polyamides made from isophthalic acid, hexamethylenediamine and other diamines such as 4,4'-diaminodicyclohexylmethane, isophoronediamine, 2,2,4- and / or 2,4,4-trimethylhexamethylene diamine, 2,5- and / or 2,6-bis (aminomethyl) norbornene; or from isophthalic acid, 4,4'-diamino-dicyclohexylmethane and ⁇ -caprolactam; or from isophthalic acid, 3,3'-dimethyl-4,4'-diamino-dicyclohexylmethane and laurolactam; or from terephthalic acid and the isomer mixture of 2,2,4- and / or 2,4,4-trimethylhexamethylene diamine.
• At least one polymer selected from the group of polycarbonates, polyesters, polyester carbonates and polyamides is additionally used, its amount is up to 500 parts by weight, preferably up to 400 parts by weight and particularly preferably up to 300 parts by weight (each based on 100 parts by weight of A + B).
• 25 parts by weight of a monomer mixture composed of 73% by weight of styrene and 27% by weight of acrylonitrile and 0.075 part by weight of tert-dodecyl mercaptan are then metered in uniformly within 2 hours.
• potassium peroxodisulfate dissolved in water
• 25 parts by weight of a monomer mixture of 73% by weight of styrene and 27% by weight of acrylonitrile and 0.075 part by weight are tert within 2 hours .
• -Dode-cyl mercaptan evenly metered in.
• the graft latex After a 4-hour post-reaction time, the graft latex, after adding about 1 part by weight of a phenolic antioxidant, is coagulated with a magnesium sulfate / acetic acid : mixture and, after washing with water, the resulting powder is dried at 70 ° C. in vacuo. 40 parts by weight of this graft polymer are mixed with 60 parts by weight of a styrene / acrylonitrile copolymer resin (72:28, M w "115,000, M w / M n -1 ⁇ _2), 2 parts by weight of ethylenediamine bisstearylamide and 0.1 part by weight of a silicone oil are mixed in an internal kneader and then processed into test specimens.
• a styrene / acrylonitrile copolymer resin 72:28, M w "115,000, M w / M n -1 ⁇ _2
• thermoplastic flowability was assessed by measuring the required filling pressure at 240 ° C (unit: bar ) (see F. Johannaber, plastics
• Example 1 is repeated, but only after the addition of potassium peroxodisulfate tert-dodecyl mercaptan in an amount of 0.15 parts by weight together with the
• Solids content of about 20 wt .-% adjusted and then heated to 65 ° C.
• Example 5 is repeated using the procedure described in Example 3.
• Example 7 is repeated using the procedure described in Example 3.
• potassium peroxodisulfate dissolved in water
• 20 parts by weight of a monomer mixture of 70% by weight of styrene and 30% by weight of acrylonitrile and 0.3% by weight are added within 1.5 hours Parts evenly metered in tert-dodecyl mercaptan.
• the graft latex is
• this graft polymer 40 parts by weight of this graft polymer are mixed with 60 parts by weight of a styrene / acrylonitrile copolymer resin (72:28, M w «138,000), 1 part by weight of pentaerythritol tetrastearate and 0.15 part by weight of a silicone oil mixed in an internal kneader and then processed into test specimens.
• a styrene / acrylonitrile copolymer resin 72:28, M w «138,000
• pentaerythritol tetrastearate 0.15 part by weight of a silicone oil mixed in an internal kneader
• Example 7 is repeated using a procedure analogous to Example 3.

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• 1998
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