Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
  • C08G64/04—Aromatic polycarbonates
• • 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
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/04—Homopolymers or copolymers of ethene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/10—Homopolymers or copolymers of propene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/16—Ethylene-propylene or ethylene-propylene-diene copolymers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
  • C08L51/04—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
  • C08L51/06—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
  • C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes

Definitions

• the present invention relates to the use of impact-modified polycarbonates with particularly good low-temperature properties and particularly good ESC behavior, for applications in which particularly good low-temperature properties and particularly good ESC behavior are required, e.g. for automotive or outdoor applications, these new modified polycarbonate compositions themselves as well as moldings and extrudates from these modified polycarbonate compositions.
• Copolycarbonates based on 4,4'-dihydroxydiphenyl and 2,2-bis (4-hydroxyphenyl) propane have now been disclosed in JP-A 5 117 382 and in EP-A 10 544407, US-A 5 470 938, US -A 5 532 324 and US-A 5 401 826 described as particularly chemical-resistant, heat-resistant and flame-retardant, at, in
• DE-A 10 047 483 describes copolycarbonates of 4,4'-dihydroxydiphenyl and 2,2-bis (4-hydroxyphenyl) propane (bisphenol A) which have particularly good low-temperature properties.
• DE-A 10 135 465 describes blends of copolycarbonates of 4,4'-dihydroxydiphenyl and 2,2-bis (4-hydroxyphenyl) propane (bisphenol A) and polycarbonate of pure 2,2-bis (4-hydroxyphenyl) propane with significantly improved low-temperature properties compared to bisphenol A polycarbonates.
• DE-A 10 105 714 describes blends of copolycarbonates of 4,4'-dihydroxydiphenyl and 2,2-bis (4-hydroxyphenyl) propane (bisphenol A) with ABS graft polymers which have a particularly good ESC Show behavior and low temperature behavior. However, due to the ABS component, these blends have a deteriorated thermal stability, heat resistance and deteriorated weathering properties compared to pure copolycarbonate (crosslinking of the ABS polymer under UV light radiation).
• copolycarbonates which contain certain dihydroxydiaryls such as 4,4'-dihydroxydiphenyl as comonomers in addition to bisphenol A, with small amounts, based on the amount of the end product, of poly-butyl acrylate core-shell modifiers or Olefin modifiers or with
• Poly (styrene-b-ethylene-co-butylene-b-styrene) modifiers or silicone-acrylic-rubber modifiers can be modified to produce a copolycarbonate of 4,4'-dihydroxydiphenyl and 2,2- To achieve bis (4-hydroxyphenyl) propane (bisphenol A) improved ESC behavior with good low-temperature properties and good thermal stability and heat resistance.
• compositions comprising (A) 89 to 99% by weight of copolycarbonate, which consists of 0.1 mol% to 46 mol%, preferably 11 mol% to 34 mol% and in particular 26 mol% to 34 mol% Compounds of the formula (I),
• R 1 to R 4 independently of one another are H, -C 4 -alkyl, phenyl, substituted phenyl or halogen, preferably H, -C -alkyl or halogen and particularly preferably all represent the same radical, in particular H or tert-butyl, and complementary amounts, ie 99.9 mol% to 54 mol%, preferably 89 mol% to 66 mol% and in particular 74 mol% to 66 mol% of compounds of the formula (II)
• R - R are independently H, CH 3 , Cl or Br and X is C1-C 5 -alkylene, C 2 -C 5 alkylidene, C 5 -C 6 cycloalkylene, C 5 -C 10 cycloalkylidene , is constructed as bisphenol monomers, and (B) 11-1% by weight modifiers, selected from the group of poly-butyl acrylate core-shell modifiers, olefin modifiers, poly (styrene-b-ethylene-co-butylene-b-styrene) modifiers, rubber graft polymers with at least one vinyl monomer graft polymer or mixtures of two or more of these modifiers.
• Preferred mixtures of the copolymer (A) with the respective modifier (B) are 91 to 99% by weight (A), very particularly preferably 93 to 99% by weight (A) with correspondingly complementary amounts of modifier (B).
• the present invention likewise relates to the use of the compositions according to the invention as materials in areas in which particularly good ESC behavior and low-temperature properties, heat resistance and thermal stability are required.
• the modifiers (B) suitable for the polycarbonate compositions according to the invention are understood to be (B1) poly-butyl acrylate core-shell modifiers as described, for example, in US Pat. No. 3,562,235 (column 1, line 28 - column 4, line 72), US 3,808,180 (column 3, line 21 - column 10, line 55) or US 3,859,389 (column 2, line 58 - column 5, line 15 and column 5, line 35 - column 6, line 54), (B2) olefin polymers from the group the polyethylenes, polypropylenes and copolymers of propene and ethene, as all described in US Pat. No.
• Preferred modifiers of these classes of compounds are Paraloid EXL 2300 ® and
• Graft polymers B used are preferably those with a core-shell structure.
• Preferred graft bases B.ll are, for example, acrylate and silicone-acrylate composite rubbers.
• the graft bases generally have an average particle size (d5Q value) of 0.01 to 5 ⁇ m, preferably 0.05 to 2 ⁇ m, in particular 0.1 to 1 ⁇ m.
• the average particle size d 50 is the diameter above and below which 50% by weight of the particles lie. It can be measured using an ultracentrifuge
• the gel fraction of the graft bases is at least 30% by weight, preferably at least 40% by weight (measured in toluene).
• the gel content is determined at 25 ° C. in a suitable solvent (M. Hoffmann, H. Krömer, R. Kuhn, Polymeranalytik I and ⁇ , Georg Thieme-Verlag, Stuttgart 1977).
• graft base B.11 for the graft polymers with core
• Shell structure C suitable are those acrylate rubbers or silicone-acrylate composite rubbers which contain 0 to 100% by weight, preferably 1 to 99% by weight, in particular 10 to 99% by weight, particularly preferably 30 to 99% by weight, of polyorganosiloxane component and 100 to 0% by weight, preferably 99 to 1% by weight, in particular 90 to 1% by weight, particularly preferably 70 to 1% by weight, of polyalkyl (meth) acrylate rubber component (the total amount of each rubber component gives 100% by weight).
• Preferred silicone acrylate rubbers are those whose preparation is described in JP 08 259 791-A, JP 07 316 409-A and EP-A 0 315 035. The relevant contents of these registrations are hereby incorporated into this registration.
• the polyorganosiloxane component in the silicone-acrylate composite rubber can be produced by reacting an organosiloxane and a multifunctional crosslinking agent in an emulsion polymerization process. It is also possible to insert graft-active sites in the rubber by adding suitable unsaturated organosiloxanes.
• the organosiloxane is generally cyclic, with the ring structures preferred
• Contain 3 to 6 Si atoms Contain 3 to 6 Si atoms.
• examples include hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, trimethyltriphenylcyclotrisiloxane, tetramethyltetraphenylcyclotetrasiloxane, octaaphenylcyclotetrasiloxane 2, which can be used alone or in a mixture of 2 or more.
• At least the organosiloxane component should build up the silicone portion in the silicone acrylate rubber 50% by weight, preferably at least 70% by weight, based on the silicone content in the silicone acrylate rubber.
• 3- or 4-functional silane compounds are generally used as crosslinking agents. Examples of this are particularly preferred: trimethoxymethylsilane, triethoxyphenylsilane, tetramethoxysilane, tetraethoxysilane, tetra-n-propoxysilane, tetrabutoxysilane. 4 functional branching agents, in particular tetraethoxysilane.
• the amount of branching agent is generally 0 to 30% by weight (based on the polyorganosiloxane component in the silicone acrylate rubber).
• CH 2 CH-SiR5 nO (3. N) / 2 (GI-3)
• R5 is methyl, ethyl, propyl or phenyl
• R6 is hydrogen or methyl
• p is a number from 1 to 6
• (Meth) acryloyloxysilane is a preferred compound for forming the structure (GI 1).
• Preferred (meth) acryloyloxysilanes are, for example, ⁇ -methacryloyloxyethyl-dimethoxy-methyl-silane, ⁇ -methacryloyl-oxy-propylmethoxy-dimethyl-silane, ⁇ -methacryloyloxypropyl-dimethoxy-methyl-silane, ⁇ -methacryloyloxypropyl-trimethoxy-rsilane , ⁇ -methacryloyloxy-propyl-ethoxy-diethyl-silane, ⁇ -methacryloyloxypropyl-diethoxy-methyl-silane, ⁇ -methacryloyloxy-butyl-diethoxy-methyl-silane.
• Vinylsiloxanes especially tetramethyl-tetravinyl-cyclotetrasiloxane are capable of
• p-vinylphenyl-dimethoxy-methylsilane can form structure GI-3
• ⁇ -mercaptopropyldimethoxymethylsilane, ⁇ -mercaptopropylmethoxy-dimethylsilane, ⁇ -mercaptopropyldiethoxymethylsilane, etc. can form structure (GI-4).
• the amount of these compounds is 0 to 10, preferably 0.5 to 5% by weight (based on the polyorganosiloxane component).
• the acrylate component (graft base) can be prepared from alkyl (meth) acrylates, crosslinking agents and graft-active monomer units, the latter in particular in the case of silicone-acrylate composite rubbers.
• alkyl (meth) acrylates are alkyl acrylates such as methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate and alkyl methacrylates such as hexyl methacrylate, 2-ethylhexyl methacrylate, n-lauryl methacrylate and, in a particularly preferred manner, n-butyl acrylate ,
• Multifunctional compounds are used as cross-linking agents. Examples include: ethylene glycol dimethacrylate, propylene glycol dimethacrylate, 1,3-butylene glycol dimethacrylate and 1,4-butylene glycol dimethacrylate.
• allyl methacrylate allyl methacrylate
• triallyl cyanurate triallyl isocyanurate
• allyl methacrylate can also act as a crosslinking agent.
• These compounds are used in amounts of 0.1 to 20% by weight, based on the acrylate rubber component in the silicone-acrylate composite rubber.
• the graft polymerization on the graft bases described above can be carried out in suspension, dispersion or emulsion. Continuous or discontinuous emulsion polymerization is preferred. This graft polymerization is carried out using free radical initiators (for example peroxides, azo compounds, hydroperoxides, persulfates, perphosphates) and, if appropriate, using anionic emulsifiers, for example carboxonium salts, sulfonic acid salts or organic salts. - io ⁇
• the graft shell C.2 is preferably made from (meth) acrylic acid (C 1 -C 8 ) alkyl ester
• Methyl methacrylate, n-butyl acrylate and / or t-butyl acrylate Methyl methacrylate, n-butyl acrylate and / or t-butyl acrylate.
• the graft shell particularly preferably consists of one or a mixture of a plurality of pure (meth) acrylic acid (C 1 -C 8 ) alkyl esters, in particular of pure methyl methacrylate.
• Butyl acrylate rubber grafted with methyl methacrylate or a silicone butyl acrylate composite rubber grafted with methyl methacrylate are particularly preferred.
• modifier (B) In principle, a mixture of two or more of the modifiers (B) described above as suitable compounds can also be used as modifier (B).
• the percentages of the bisphenol monomers relate to the total content of bisphenols in the polycarbonates, which is defined as 100%.
• a pure bisphenol A polycarbonate would then consist of 100% bisphenol A.
• the carbonate content from carbonic acid esters or halides is not taken into account.
• Preferred, particularly preferred or very particularly preferred are compositions which have the compositions mentioned under preferred, particularly preferred or very particularly preferred.
• polycarbonate compositions according to the invention have improved ESC behavior with copolymers of 4,4'-dihydroxydiphenyl and 2,2-bis (4-hydroxyphenyl) propane (bisphenol A) with good low-temperature properties and have good thermal stability and heat resistance.
• the modified copolycarbonates can therefore be used as moldings wherever the properties of the polycarbonates known hitherto are inadequate, in particular e.g. in the electrical sector, in the safety clothing sector, in particular for protective helmets and visors, and in the construction sector, for covers or glazing, in particular in the motor vehicle sector as foils, plates, fittings or housing parts, but also in the optical sector as lenses and data storage and as consumer articles, namely, when increased heat resistance or chemical resistance are required with good low-temperature properties. They can also do other things in such applications
• good low-temperature properties are to be understood as examples, but not restrictively, of good low-temperature toughness, since ordinary poly- carbonates become brittle at low temperatures and tend to break and crack.
• temperatures are below 0 ° C, particularly preferably below -10 ° C, very particularly preferably below -20 ° C, particularly preferably below -30 ° C and emphasized below -40 ° C.
• Good ESC behavior is to be understood according to the invention, by way of example, but not by way of limitation, as good chemical resistance under load according to DEST 53449/3 (bending strip test) after storage for one hour at 22 ° C. in i-octane / toluene 1/1.
• Good thermal stability according to the invention is to be understood as an example, but not restrictive, of the stability according to the color and impact strength of the compositions according to the invention at processing temperatures of the materials above 290 ° C., preferably above 300 ° C.
• good heat resistance is to be understood as an example, but not restrictive, of a dimensional stability of the materials above 140 ° C., preferably above 150 ° C.
• Preferred compounds of formula (I) are 4,4'-dihydroxydiphenyl (DOD) and 4,4'-dihydroxy-3,3 ', 5,5'-tetra (tert-butyl) diphenyl, 4,4'-dihydroxy- 3,3 ', 5,5 ' 'tetra (n-butyl) diphenyl and 4,4'-dihydroxy-3,3', 5,5'tetra (methyl) diphenyl, particularly preferred is 4,4'- dihydroxydiphenyl.
• DOD 4,4'-dihydroxydiphenyl
• DOD 4,4'-dihydroxy-3,3 ', 5,5'-tetra (tert-butyl) diphenyl
• 4,4'-dihydroxy- 3,3 ', 5,5 ' 'tetra (n-butyl) diphenyl 4,4'-dihydroxy-3,3', 5,5'tetra (methyl) diphenyl
• Preferred compounds of the formula (II) are 2,2-bis (4-hydroxyphenyl) propane, 1,1-
• the copolycarbonate (A) can contain both one compound of the formula (I) and several compounds of the formula (I).
• (A) can contain both one compound of the formula (II) and several compounds of the formula (U).
• copolycarbonates are preferably prepared in solution with the participation of monomers of the formula (I), specifically according to the
• Phase interface method and the method in homogeneous phase are also possible in the melt using the known polycarbonate production process (so-called melt transesterification process), which e.g. is described in DE-A 1 96 46 401 or in DE-A 42 38 123.
• melt transesterification process e.g. is described in DE-A 1 96 46 401 or in DE-A 42 38 123.
• transesterification processes acetate processes and phenyl ester processes
• the modifiers (B) according to the invention are preferably from commercial
• the polymer (A) and the modifier (B) may contain impurities due to the synthesis. However, high purity is desirable and desirable, which is why they are used with the highest possible purity for the production of the modified copolycarbonates.
• the modified copolycarbonates according to the invention can contain various end groups. These are introduced by chain breakers. Chain terminators in the sense of the invention are those of the formula (III)
• R, R 'and R "are independently H, optionally branched C ⁇ -C 34 - alkyl / cycloalkyl, C 7 -C 34 alkaryl or C 6 -C 34 -aryl may represent, for example butylphenol, tritylphenol, cumylphenol, phenol, Octylphenol, preferably butylphenol or phenol, where the copolycarbonate (A) can contain both the same and a different end group as the bisphenol A polycarbonate (B).
• the copolycarbonate (A) may contain small amounts of branching agents from 0.02 to 3.6 mol% (based on the dihydroxy compound).
• Suitable branching agents are the compounds with three or more functional groups suitable for polycarbonate production, preferably those with three or more than three phenolic OH groups, for example l, l, l-tri- (4-hydroxyphenyl) ethane and isatin biscresol.
• auxiliaries and reinforcing materials can be mixed into the compositions according to the invention.
• the following are to be considered as such: thermal and UV stabilizers, flow aids, mold release agents, flame retardants, pigments, finely divided minerals, fiber materials, eg Alkyl and aryl phosphites, phosphates, phosphines, low molecular weight carboxylic acid esters, halogen compounds, salts, chalk, quartz powder, glass and carbon fibers, pigments and their combinations.
• thermal and UV stabilizers eg Alkyl and aryl phosphites, phosphates, phosphines, low molecular weight carboxylic acid esters, halogen compounds, salts, chalk, quartz powder, glass and carbon fibers, pigments and their combinations.
• modified copolycarbonates according to the invention can also be mixed with other polymers, for. B. other polycarbonates, polyolefins, polyurethanes, polyesters and polystyrene.
• Bisphenol-A polycarbonate can preferably be added to the modified copolycarbonates according to the invention.
• Makrolon 3108 can be particularly preferably admixed with the modified copolycarbonates according to the invention.
• Makrolon 3108 based on the modified copolycarbonates according to the invention, particularly preferably up to 5% by weight.
• Makrolon 3108 is an unbranched homopolycarbonate based on bisphenol A with an average molecular weight of M w of 31000 g mol "1 .
• These substances are preferably added to the finished polycarbonate in conventional units, but, depending on the requirements, can also be carried out at a different stage in the production process.
• the copolycarbonate (A) used can have molecular weights between Mw (weight-average molecular weight) 10,000 to 60,000, preferably Mw 20,000 to 55,000, determined by measuring the relative solution viscosity in dichloromethane or in mixtures of equal amounts by weight of phenol / o-dichlorobenzene, calibrated by light scattering. It can already contain additives or stabilizers such as can also be added to the blends according to the invention.
• the modified copolycarbonates themselves are likewise the subject of the present application.
• the modified copolycarbonates according to the invention are at temperatures of
• thermoplastically processable Any shaped bodies and foils can be produced in a known manner by injection molding or via extrusion. Moldings and extrudates from the modified copolycarbonates according to the invention are also the subject of the present application.
• the modified copolycarbonates according to the invention are in solvents such as chlorinated hydrocarbons, e.g. Methylene chloride, highly soluble and can thus be processed into cast films, for example, in a known manner.
• solvents such as chlorinated hydrocarbons, e.g. Methylene chloride
• Safety panes which are known to be required in many areas of buildings, vehicles and aircraft, and as shields for helmets,
• optical device parts in particular lenses for photo and film cameras (see for example DE-A 2 701 173),
• a light transmission carrier in particular as an optical fiber cable (see, for example, EP-AI 0 089 801),
• headlight lamps so-called “head-lamps”, flare lenses or inner lenses
• safety clothing such as protective helmets and visors
• compositions according to the invention are particularly suitable, independently of one another, for use in safety clothing, in optical applications, in medical and food applications, in films, in the automotive sector, in outdoor applications and in the electrical sector.
• films can be produced from the high molecular, aromatic, modified copolycarbonates according to the invention.
• the films have preferred thicknesses between 1 and 1500 ⁇ m, in particular preferred thicknesses between 10 and 900 ⁇ m.
• the films obtained can be stretched monoaxially or biaxially in a manner known per se, preferably in a ratio of 1: 1.5 to 1: 5.
• the films can be produced by the known processes for film production, for example by extrusion of a polymer melt through a slot die, by blowing on a film blowing machine, by deep drawing or casting. It is possible that the foils are used on their own. They can of course also be used to produce composite films with other plastic films using the conventional methods, with all known films in principle being suitable as partners, depending on the desired application and the final properties of the composite film. A composite of two or more foils can be created.
• modified copolycarbonates according to the invention can also be used in other layer systems, such as in coextruded sheets.
• the polycarbonates used were melt-melted using the known production processes, as described, for example, in DE-A 42 38 123, and via the phase interface, as described, for example, in "Schnell", Chemistry and Physics of Polycarbonates, Polymer Reviews, Vol : 9, Interscience Publishers, New York, London, Sydney 1964, pp. 33 ff.
• a polycarbonate with 30 mol% dihydroxydiphenyl (DOD) and 70 mol% bisphenol A was produced as copolycarbonate (A).
• DOD dihydroxydiphenyl
• A Tert-butylphenol was used as the chain terminator.
• the granules have a relative solution viscosity of 1.30 and an average molecular weight M w of 20,000 g mol "1 .
• the compounds Paraloid ® EXL commercially available were 2300 (a butyl acrylate rubber grafted with methyl methacrylate), Kraton ®
• Metablen ® S2001 a silicone butyl acrylate composite rubber grafted with methyl methacrylate
• Novolen ® 1100 L Novolen ® 1100 L.
• Comparative Example 1 a copolycarbonate with 30 mol% dihydroxydiphenyl (DOD) and 70 mol% bisphenol A was produced.
• the granules have a relative solution viscosity of 1.30.
• Comparative Example 2 a bisphenol A polycarbonate with a molecular weight of 31,000 g mol "1 , expressed in the relative solution viscosity (eta rel) of 1.31, was used.
• Emulsion polymerization and with 17 mol% styrene / acrylonitrile copolymer with a styrene / acrylonitrile ratio of 72:28 and an intrinsic viscosity of 0.55 dl / g measured in dimethylformarnide at 20 ° C, blended.
• the relative solution viscosity was determined in dichloromethane at a concentration of 5 g / 1 at 25 ° C.
• the impact test according to ISO 180 / 4A was used to determine the impact strength. Ten test specimens were measured in each case. Table 1 shows the value that the majority of the test specimens had.
• the chemical resistance under load is carried out in accordance with DLN 53449/3 (bending strip test) in isooetane / toluene 1/1.
• Sample platelets are manufactured in different temperatures by injection molding and then visually assessed.
• the compounding to the blend was carried out on a ZSK 32 (twin-screw extruder, Werner & Pfleiderer, Stuttgart) at 300 ° C and a throughput of 10 kg / h.
• composition is shown in Table 1, the data are in% by weight of the composition.
• Table 1 (data in% by weight of the composition)
• the modified polycarbonates surprisingly show a significantly improved chemical resistance compared to the unmodified polycarbonates mentioned in the comparative examples. This means that they do not break in the bending strip test when the edge fibers are stretched, or only break under a much greater force than with the unmodified polycarbonates.
• the majority of the modified samples (ex. 2, 3, 5) surprisingly show tough behavior even with 1.0% edge fiber elongation.
• the comparative examples reveal undesirable brittle fracture behavior under marginal fiber stretching at the lowest load.
• the number 1 means no surface defects or streaking, 2 small surface defects or streaking.
• the number 3 means severe surface defects or streaking.

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