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
  • C08G64/06—Aromatic polycarbonates not containing aliphatic unsaturation
  • C08G64/14—Aromatic polycarbonates not containing aliphatic unsaturation containing a chain-terminating or -crosslinking agent
• • 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
  • C08G64/20—General preparatory processes
  • C08G64/22—General preparatory processes using carbonyl halides
  • C08G64/24—General preparatory processes using carbonyl halides and phenols

Definitions

• Alkylphenol for molecular weight adjustment and polycarbonate compositions having improved properties are provided.
• the invention relates to the use of alkylphenols for adjusting the molecular weight of polycarbonates and to compositions of these polycarbonates with additives selected from the group of thermo-stabilizers, release liners and light stabilizers, their use for the production of molded parts and moldings obtainable therefrom
• Polycarbonates belong to the group of engineering thermoplastics. They find versatile applications in the electrical and electronics sector, as housing material for luminaires and in applications requiring special mechanical properties. Another large field of application is optical data storage such as the various CD and DVD formats as well as Blu-ray Disc and HD-DVD, as well as extrusion applications such as polycarbonate sheets, diffuser sheets and other display applications or water bottles, but also optical applications in the automotive sector, such as glazing, plastic covers, diffusers or light elements and lamp covers for linear luminaires
• Another object was to develop aromatic polycarbonate compositions having improved heat distortion resistance and impact strength
• Polycarbonate compositions according to the invention prepared from the polycarbonates obtained in this way and The Sp ⁇ tzgussmaschine and extrudates available therefrom have significantly improved thermal (glass transition temperature Tg and Vicat temperature) and mechanical properties (Zahgtechnik, ball indentation temperature and impact strength, especially at low temperatures) on The present invention therefore provides the use of alkylphenols of the general formula (1)
• R 1 and R 2 independently of one another are hydrogen, C 1 -C 8 -alkyl, C 6 -C 12 -aryl, phenyl-C 1 -C 6 -alkyl or naphthyl-C 1 -C 6 -alkyl, but R 1 and R 2 can not simultaneously be hydrogen,
• U is 1, 08 to 1, 18, preferably 1, 10 to 1, 16,
• medium-viscosity PC with an average molecular weight (weight average) of greater than 22,000 to 26,000 g / mol is U 1, 18 to 1, 60, preferably 1, 20 to 1, 55, particularly preferably 1, 20 to 1, 50,
• R 1 and R 2 independently of one another preferably represent hydrogen or alkyl having 1 to 8, particularly preferably 1 to 4, carbon atoms, with the proviso that R 1 and R 2 are not simultaneously hydrogen.
• Very particular preference is given to tert-butylphenol or n-butylphenol, in particular p-tert. Butylphenol.
• Thermoplastic, aromatic polycarbonates in the context of the present invention are both homopolycarbonates and copolycarbonates; The polycarbonates may be linear or branched in a known manner.
• thermoplastic polycarbonates copolycarbonates including the thermoplastic, aromatic polyester carbonates, both summarized by the term polycarboxylic, have the abovementioned molecular weights M w (weight average Mw, determined by gel permeation chromatography (GPC) measurement, polycarbonate calibration). Molecular weights can also be indicated by the number average Mn, which are likewise determined after prior calibration on polycarbonate by means of GPC.
• the non-uniformity U (Mw / Mn) -1 as a measure of the molecular weight distribution of the polycarbonate compositions PC can thus be determined for different molecular weight ranges.
• the present invention furthermore relates to compositions containing
• the composition generally contains from 0.001 to 1, preferably from 0.005 to 0.8, particularly preferably from 0.04 to 0.5% by weight (based on the total composition) of additives according to component B)
• Tris (2,4-di-tert-butylphenyl) phosphite, tetrakis (2,4-di-tert-butylphenyl) [1,1-diphenyl] -4,4-diylbisphosphonite triisooctyl phosphate, octadecyl-3- (triazine) are preferred as the theoretical stabilizers.
• Irganox 1076 bis (2,4-dicumylphenyl) pentaerythritol diphosphite (Doverphos S-9228), bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol-diphosphite (ADK STAB PEP-36) or triphenylphosphine. They are used alone or in a mixture, for. B. Irganox B 900 used.
• Enlformungsmitttel are preferably pentaerythritol tetrastearate, glycerol monostearate, stearyl stearate or propanediol stearate. They are used alone or in a mixture.
• As light stabilizers are preferably benzotriazoles, triazines, benzophenol, cyanoacrylates, cinnamic acid esters or oxalimides. They are used alone or in a mixture.
• the preparation of the polycarbonates to be used according to the invention takes place in principle in a known manner from diphenols, carbonic acid derivatives and optionally branching agents.
• EP-A 0 517 044, WO 2006/072344, EP-A 1 609 818, WO 2006/072344 and EP-A 1 609 818 and documents cited therein describe, for example, the phase boundary and the melt process for the production of polycarbonate.
• the organic phase is finally separated off and the polycarbonate is isolated therefrom by various work-up steps, preferably by evaporation extruder or strand evaporator.
• the key step in obtaining products with very good impact strength and improved heat resistance is to carry out this continuous process so that the narrowest possible molecular weight distribution of the polycarbonate, i. low nonuniformity, already in the synthesis and without special workup, e.g. Precipitation or spray evaporation is obtained.
• This is inventively achieved by the appropriate choice of chain terminator, which leads to a lower nonuniformity.
• Dihydroxyaryl compounds suitable for the preparation of polycarbonates are those of the formula (2)
• Z is an aromatic radical having 6 to 30 carbon atoms, which may contain one or more aromatic nuclei, may be substituted and may contain aliphatic or cycloaliphatic radicals or alkylaryls or heteroatoms as bridge members.
• Z in formula (2) preferably represents a radical of the formula (3)
• R 6 and R 7 are each independently H, C r C
• X represents a single bond, -SO r , -CO-, -O-, -S-, C 1 - to C 6 -alkylene, C 2 - to C 5 -
• 2 -arylene, which may optionally be condensed with further heteroatom-containing aromatic rings is.
• X is a single bond, C to C alkylene, C to C alkylidene, -O-, -SO-, - CO-, -S-, -SO 2 -, more preferably X is a single bond, isopropylidene or Oxygen.
• Diphenolc suitable for the preparation of the polycarbonates to be used according to the invention are, for example, hydroquinone, resorcinol, dihydroxydiphenyl, bis (hydroxyphenyl) alkanes, bis (hydroxyphenyl) sulfides, bis (hydroxyphenyl) ethers, bis (hydroxyphenyl) -kelones, Bis (hydroxyphenyl) sulfones, bis (hydroxyphenyl) sulfoxides, ⁇ , ⁇ '-bis (hydroxyphenyl) diisopropylbenzenes, and their alkylated, alkoxylated and ring-halogenated compounds.
• Preferred diphenols are 4,4'-dihydroxydiphenyl, 2,2-bis (4-hydroxyphenyl) -l-phenyl-propane, 1,1-bis- (4-hydroxyphenyl) -phenyl-ethane, 2,2-bis- (4-hydroxyphenyl) propane, 2,2-bis (3-methyl, A-hydroxyphenyl) -propane, 2,4-bis (4-hydroxyphenyl) -2-methylbutane, 1,3-bis- [2- (4-hydroxyphenyl) -2-propyl] benzene (bisphenol M), 2,2-bis (3-methyl-4-hydroxyphenyl) -propane, bis (3,5-dimethyl-4-hydroxyphenyl) -methane, 2,2-bis- (3,5-dimethyl-4-hydroxyphenyl) -propane, bis- (3,5-dimethyl-4- hydroxyphenyl) sulfone, 2,4-bis (3,5-dimethyl-4-hydroxyphenyl) -2-methylbut
• diphenols are 2,2-bis- (4-hydroxyphenyl) -propane (BPA), 4,4'-dihydroxydiphenyl (DOD) and 2,2-bis (3-methyl-4-hydroxyphenyl) -propane.
• an aqueous phase of NaOH, one or more Bisphenolcn and water is used, wherein the concentration of this aqueous solution with respect to the sum of bisphenols, not as sodium salt but as free bisphenol calculated, between 1 and 30 wt.%, Preferably between 3 and 25% by weight, particularly preferably between 3 and 8% by weight, for polycarbonates having a Mw> 45,000 and 12 to 22% by weight for polycarbonates having a Mw ⁇ 45,000. It may be necessary at higher concentrations to temper the solutions.
• the sodium hydroxide used to dissolve the bisphenols can be used solid or as an aqueous sodium hydroxide solution.
• the concentration of the sodium hydroxide solution depends on the target concentration of the desired bisphenolate solution, but is usually between 5 and 25 wt .-%, preferably 5 and 10 wt .-%., Or is more concentrated and then diluted with water. In the process with subsequent dilution, sodium hydroxide solutions having concentrations of between 15 and 75% by weight, preferably 25 and 55% by weight, if appropriate tempered, are used.
• the alkali content per mole of bisphenol is very dependent on the structure of the bisphenol, but is usually between 0.25 moles of alkali / mole of bisphenol and 5.00 moles of alkali / mole of bisphenol, preferably 1.5- 2.5 moles of alkali / mol of bisphenol and, in the case that bisphenol A is used as the sole bisphenol, 1.85 - 2.15 moles of alkali. If more than one bisphenol is used, they can be dissolved together. However, it may be advantageous to dissolve the bisphenols separately in an optimal alkaline phase and to separate the solutions separately. Furthermore, it may be advantageous to dissolve the bisphenols or not in sodium hydroxide solution but in dilute bisphenolate solution equipped with additional alkali.
• the loosening processes may start from solid bisphenol, usually in flakes or pellets or else from molten bisphenol
• the sodium hydroxide or sodium hydroxide solution used can be prepared by the amalgam process or the so-called membrane process. Both processes are used for a long time and are familiar to the person skilled in the art. Preference is given to using sodium hydroxide solution from the membrane process
• aqueous phase thus prepared is phosgenated together with an organic phase consisting of polycarbonate solvents that are inert to the reactants and form a second phase
• the optionally practiced dosage of bisphenol after or during the phosgene introduction can be carried out as long as phosgene is present in the reaction solution or its immediate secondary products, the chloroformate
• the synthesis of polycarbonates from bisphenols and phosgene in an alkaline medium is an exothermic reaction and is carried out in a temperature range from -5 ° C to 100 ° C, preferably 15 ° C to 80 0 C, most preferably 25 ° C - 65 ° C. , where appropriate, depending on the solvent or solvent mixture must be carried out under pressure
• the organic phase may consist of one or mixtures of several solvents, with mixtures being preferred.
• Suitable solvents are chlorinated hydrocarbons substances (aliphatic and / or aromatic), preferably dichloromethane, trichlorethylene, 1,1,1-trichlorethylene, 1, 1, 2- F ⁇ chlorethan and chlorobenzene and mixtures thereof Cs can, however, also aiomalischc hydrocarbons such as benzene, toluene, m / p / o-xylene or aromatic ethers such as anisole alone, used in admixture or in addition or in admixture with chlorinated hydrocarbons 1e ine other embodiment of the Synthesis uses solvents which do not dissolve polycarbonate but only swell.
• solvents which are soluble in the aqueous phase such as tetrahydrofuran, 1, 3/1, 4-dioxane or 1 may be used when the solvent partner forms the second organic phase.
• solvents which are soluble in the aqueous phase such as tetrahydrofuran, 1, 3/1, 4-dioxane or 1 may be used when the solvent partner forms the second organic phase.
• mixtures of methylene chloride and chlorobenzene having a mixture ratio (weight ratio) of 60-55-55-45 are possible
• the two phases that make up the reaction mixture are mixed to accelerate the reaction. This is done by injecting energy through shear, ie pumping or dehydration or by static mixer or by generating turbulent flow by means of nozzles and / or diaphragms Also combinations of these measures are applied, often repeated in temporal or apparative sequence
• Ruhrer anchor, propeller, MIG-Ruhrer, etc are preferably used, as z B are described in Ullmann, "Encyclopedia of Industrial Chemistry", 5th edition, VoI B2, S 251 ff.
• centrifugal pumps often multi-stage, with 2- to 9-stage are preferred used as nozzles and / or aperture pinhole or in their place preciselyquettete pipe pieces or Ventu ⁇ - or Lefosdusen geset / t
• the phosgene may be introduced in gaseous or liquid form or dissolved in solvent.
• the excess of phosgene used based on the sum of the bisphenols used, is between 3 and 100 mol%, preferably between 5 and 50 mol%, with one or several replenishment of sodium hydroxide solution or corresponding addition of bisphenolate solution, the pH of the aqueous phase during and after the phosgene dosage in the alkaline range, preferably between 8.5 and 12, while it should be 10 to 14 after the addition of the catalyst.
• the temperature during the phosgenation is 25 0 C to 85 ° C, preferably 35 ° C to 65 ° C, wherein solvent, depending on the I can be geaibeitet piece under Ubcidi
• the phosgene dosage can be carried out directly into the described mixture of the organic and aqueous phases or also completely or partially, before mixing the phases, in one of the two phases, which is then mixed with the corresponding other phase. Further, the phosgene may be wholly or partly in
• the aqueous phase described is mixed with the organic phase containing the phosgene and then, after a residence time of from 1 second to 5 minutes, a jerked partial stream of the synthesis mixture is metered in from both phases, this partial stream preferably being recycled before the addition of the catalyst , preferably 3 seconds to 2 minutes added to the above-mentioned recycled partial flow or the two phases, the Wass ⁇ ge phase described with the phosgene-containing organic phase are mixed directly in the above-mentioned ⁇ ickgcflect lelstrom in all of these forms from leadership are observe the above-mentioned pH ranges / M and, if appropriate, observe this by repeated or multiple post-dosing of sodium hydroxide solution or
• the reaction can be carried out in Umpumpreaktoren, tubular reactors, or Ruhrkesselkaskaden or combinations thereof, which is ensured by using the mixing elements already mentioned that wassnge and As far as possible, the organic phase should first separate from the mixture if the synthesis mixture has reacted, ie no more saponifiable chlorine of phosgene or chlorocarbonic acid residues is present
• the need for regulating the molecular weight monofunctional Keltenabbi echei of formula 1 or mixtures thereof, are fed as such or in the form of their Chlororkohlensauieester, either with the bisphenolate or the bisphenolates of the reaction or added to leather arbitrary time of synthesis, as long as phosgene in the reaction mixture or in the case of acid chlorides and carbonic acid esters as chain terminators as long as enough phenolic end groups of the forming polymer are available.
• the chain terminator (s) are added at one place or at a time after phosgenation, if none Phosgene more voi- is, but the catalyst was not dosed yet, or they are before the catalyst, with the catalyst together or dosed in parallel
• the amount of chain terminator to be used is from 0.5 mol% to 10 mol%, preferably from 1 mol% to 8 mol%, particularly preferably from 2 mol% to 6 mol%, based on mols of in each case used Diphenols
• the addition of the chain terminators can take place before, during or after the phosgenation, preferably as a solution in a solvent mixture of methylene chloride and chlorobenzene (8-15% by weight).
• the catalysts used in the interfacial phase synthesis are tert amines, in particular e 1 ⁇ ethylamin, T ⁇ butylamin, T ⁇ octylamin, N-Fthylpipe ⁇ dm, N-Methylpipe ⁇ din, Ni / n- Propylpipe ⁇ din, more preferably T ⁇ ethylamin and N-Ethylpipe ⁇ din
• the catalysts can individually, in admixture or next to Dosages of the catalyst or of the catalysts can be used in bulk, in an inert solvent, preferably that of the polycarbonate synthesis, or else as an aqueous solution, in the If the tertiary amines are then used as their ammonium salts with acids, if necessary, if they contain several catalysts or the metering of partial amounts of the total amount of catalyst, it is of course also possible to carry out unpaired dosing operations at different locations or at different times Total amount of catalysts used is between 0.001 to 10 mol%
• dwell times are between 10 seconds and 60 minutes, preferably between 30 seconds and 40 minutes, more preferably between 1 and 15 minutes.
• the wassnge alkaline phase is possibly wholly or partially fed back into the polycarbonate synthesis as an aqueous phase or fed to the wastewater treatment, where solvent and catalyst fractions
• the salt is separated off, for example the chloralkali electrolysis can be fed, while the aqueous phase is optionally fed back to the synthesis
• the organic, polymer-containing phase must now be cleaned of all contaminations of alkaline, ionic or catalytic type
• the organic phase also contains one or more settling agents, optionally supported by passages through settling tanks, rinsing vessels, coalescers or segregates, or combinations thereof - optionally with water in each or several stages of operation, using active or passive mixing means / u- can be dosed - still shares the wass ⁇ gen alkaline phase in fine droplets and the catalyst, usually a tertiary amine
• the organic phase is washed once or several times with dilute acids such as mineral, carbon hydroxycarboxylic and / or sulfonic acids.
• dilute acids such as mineral, carbon hydroxycarboxylic and / or sulfonic acids.
• wet mineral acids especially hydrochloric acid, phosphorous acid and phosphoric acid or mixtures of these acids
• concentration of these acids should be in the range of 0.001 to 50% by weight, preferably 0.01 to 5% by weight
• the organic phase is also washed with demineralized or distilled water.
• the organic phase which is optionally dispersed with parts of the aqueous phase is separated off by means of an autoclave, a Ruhrkessel, a coalescer or separators or combinations of these measures
• Wash water / wiping the Waschsch ⁇ tten optionally using active or passive mixing devices can be dosed
• Acids preferably dissolved in the solvent on which the polymer solution is based, may optionally be added between these washes or else after washing.
• Hydrogen chloride gas and phosphoric acid or phosphorous acid are preferably used here, which may optionally also be used as mixtures
• the purified polymer solution obtained in this way should not contain more than 5% by weight, preferably less than 1% by weight, most preferably less than 0.5% by weight of water after the last separation process
• the isolation of the polymer from the solution can be carried out by evaporation of the solvent by means of 1 emperature, vacuum or a heated towing gas
• the remainders of the solvent can either be obtained directly from the melt with steam extruders (BE-A 866 991, FP-A 0 41 1 510, US Pat. No. 4,980,105, DE-A 33 32 065), Thin film evaporators (IiP-A 0 267 025), ddmp- fern, strand evaporators or by F ⁇ technischskompakttechnik (EP-A 0 460 450), optionally also with the addition of an entrainer, such as nitrogen or carbon dioxide or using vacuum (EP-A 0 039 96, EP-A 0 256 003, US Pat.
• steam extruders BE-A 866 991, FP-A 0 41 1 510, US Pat. No. 4,980,105, DE-A 33 32 065
• Thin film evaporators IiP-A 0 267 025
• ddmp- fern ddmp- fern
• strand evaporators or by F ⁇ technischskompak
• Cooling, stripping, granulation and the subsequent transport or I oidei ung the granules with gas or liquid, and the subsequent storage, optionally after a mixing or homogenization process, are to be designed so that as possible trot / possibly existing static charge no impurities be applied to the polymer, Sti ang or granule surface, such as dust, abrasion from the machinery, aerosol-like lubricants and other liquids, and salts from water baths or may be used Kuhlache
• additives serves to extend the useful life or the Faibe (stabilizers), the simplification of processing (eg demodulator, flow aids, antistatic agents) odei the adaptation of the polymer properties to certain loads (impact modifiers, such as rubbers, flame retardants, colorants, glass fibers)
• additives can be added to the polymer melt individually or in any desired mixtures or several different mixtures, specifically directly in the isolation of the polymer or after melting of granules in a so-called compounding solution.
• the additives or their mixtures may be used as a solid, ie as a powder. or else added as a melt to the polymer melt.
• Another type of metering is the use of masterbatches or mixtures of masterbatches of the additives or of the solid mixtures
• Typical additives include, for example, fillers, UV stabilizers other than component B, thermostable agents, antistals, pigments, component release agents other than component B, mold release agents, flow aids and flameproofing agents.
• fillers for example, UV stabilizers other than component B, thermostable agents, antistals, pigments, component release agents other than component B, mold release agents, flow aids and flameproofing agents.
• thermostable agents for example, alkyl and aryl phosphites, phosphates, phosphanes, low molecular weight Cai bon- acid esters, halogen compounds, salts, chalk, quartz powder, glass and carbon fibers, and combinations thereof.
• colorants such as organic dyes or pigments or inorganic pigments, IR absorbers, individually, mixed or in combination with stabilizers, glass (hollow) spheres, inorganic fillers or organic or inorganic Streupigmenle be added.
• polycarbonates and polycarbonate compositions according to the invention can be processed in conventional manner on conventional machines, for example on extruders or injection molding machines, to form any shaped bodies or shaped parts into films or sheets or bottles.
• the narrow molecular weight distribution polycarbonates obtainable in this invention and polycarbonate compositions obtainable therefrom can be used for the production of adhesive substrates (sheets, films and their laminates, eg for card applications and pipes) and moldings (bottles), especially those for use in the transparent area, especially in the field of optical applications such as Panels, multi-wall sheets, automotive and architectural glazings, diffusers or covers, lamp covers, plastic covers, light guides or optical data storage devices such as audio CD, CD-R (W), DVD, DVD-R (W), mini discs their various only readable or rewritable but possibly also repeatedly described embodiments and data carriers for near-field optics are used. Furthermore, for the production of objects for the E / E and IT sector, such as housing components or covers. Other optical applications include lenses, collimators, LEDS, light guides in LED lighting unit.
• the polycarbonate compositions are used in particular for the production of compounds, blends and components which utilize thermal and mechanical properties, such as housings, E / E articles, such as plugs, switches, plates, lamp holders, covers, automotive such as lampholders and covers, glazings., medical field such as dialyzers, connectors, taps, packaging such as bottles, containers.
• thermal and mechanical properties such as housings, E / E articles, such as plugs, switches, plates, lamp holders, covers, automotive such as lampholders and covers, glazings.
• medical field such as dialyzers, connectors, taps, packaging such as bottles, containers.
• extrudates and shaped articles or molded parts made from the polymers according to the invention are likewise the subject of the present application.
• polycarbonate molding compositions according to the invention are safety disks, which are known to be required in many areas of buildings, vehicles and aircraft, and as shields of helmets.
• Production of extrusion and solution films for displays or electric motors also ski films.
• Production of blowpads like Water Bottles see, for example, U.S. Patent 2,964,794.
• traffic light housings or For the production of traffic light housings or recountschi Ldem.
• foams see for example DE-B 1 031 507).
• threads and wires see for example DE-B 1 137 167 and DE-A 1 785 137).
• the reaction is carried out continuously in an emulsion which consists of a solution mixture mixture composed of 52.2% by weight of methylene chloride and 47.5% by weight of chlorobenzene, and water.
• the chain terminators used are p-tert-butylphenol (BUP) and phenol (PI IE).
• the catalyst used is N-ethylpiperidine (EPP) or triethylamine (TEA).
• EPP N-ethylpiperidine
• TEA triethylamine
• the polycarbonate solutions thus washed are concentrated in a multistage thermal pre-evaporation to a concentration of 60-70% by weight of polycarbonate.
• a Ausdampfextruder the residual solvent is evaporated and the resulting polycarbonate recovered as a melt strand, which was supplied after cooling in a water bath granulation.
• the Tg is determined according to ISO 1 1357, the HDT according to ISO 75.
• the solution viscosity is determined in methylene chloride (0.5 g polycarbond / 1) at 25 ° C.
• the nitrogen content wn d determined according to Antek The determination of phenolic OH (end-group determination ) in polycaibonate erolys photometrically after complexing with titanium tetrachloride 1 iC14 (calibration with bisphenol A) - 1 !
• saponifiable chlorine end group determination
• polycarbonate is carried out photometrically after reaction with 4- (4-nitrobenzyl) -pyridine (calibration with bischloroclinic acid ester of bisphenol A).
• V comparison The settings 4 and 5 (respectively settings with phenol as Keuenabbrecher) /.eigen compared to the settings 1 to 3 (each with p-tert-butylphenol as a chain terminator) significantly lower Vicat temperatures (about 144 0 C)
• the polycarbonates according to Examples 6 to 8 were prepared analogously to the Hei position of Examples 1 to 5, but with 100 times higher throughput
• PCl BUP as chain terminator
• PC2 PHE as chain terminator
• composition according to the invention containing PCl has both a higher Vicat temperature and a higher ball indentation temperature (KET) compared to the PC2-containing composition.
• PC 9 (comparison): Branched polycarbonate was prepared analogously to Example 4, with phenol as Kettenabbrccher and additionally 0.3 wt.% Isatin biscresol (IBK) as branching agent; relative solution viscosity: 1, 31.
• PC 10 (according to the invention):
• Branched polycarbonate was prepared analogously to Example 6, with BUP as a chain terminator and additionally 0.3 wt.% IBK as branching agent; relative solution viscosity: 1, 31.
• the polycarbonate PC 10 according to the invention shows in all cases a higher heat distortion resistance than PC 9.

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