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
  • C08G64/08—Aromatic polycarbonates not containing aliphatic unsaturation containing atoms other than carbon, hydrogen or oxygen
  • C08G64/12—Aromatic polycarbonates not containing aliphatic unsaturation containing atoms other than carbon, hydrogen or oxygen containing nitrogen
• • 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
  • C08G64/08—Aromatic polycarbonates not containing aliphatic unsaturation containing atoms other than carbon, hydrogen or oxygen
• • 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

Definitions

• the present invention relates to polycarbonates and copolycarbonates with higher glass and thus also use temperature and improved metal adhesion, processes for their preparation and their use for the production of blends, moldings and extrudates obtainable therefrom.
• the invention further relates to two new bisphenols and their use for the preparation of (co) polycarbonates.
• Aromatic polycarbonates belong to the group of engineering thermoplastics. They are characterized by the combination of the technologically important properties of transparency, heat resistance and toughness.
• the alkali metal salts of bisphenols are reacted with phosgene in the two-phase mixture.
• the molecular weight can be determined by the amount of monophenols such. As phenol or tert-butylphenol can be controlled. In these reactions arise almost exclusively linear polymers. This can be demonstrated by end group analysis.
• branching agents generally polyhydroxylated compounds, branched polycarbonates are also obtained.
• the bisphenols are reacted with diaryl carbonates, usually diphenyl carbonate, in the presence of catalysts, such as alkali metal salts, ammonium or phosphonium compounds, in the melt.
• catalysts such as alkali metal salts, ammonium or phosphonium compounds
• melt transesterification process is described, for example, in the Encyclopedia of Polymer Science, Vol. 10 (1969), Chemistry and Physics of Polycarbonates, Polymer Reviews, H. Schnell, Vol. 9, John Wiley and Sons, Inc. (1964) and DE-C 10 31 512 described.
• EP-A 1 582 549 discloses polycarbonates based on 2-hydrocarbyl-3,3-bis (4-hydroxyaryl) phthalimidines as monomers which can be prepared by synthesis from phenolphthalein and an aniline hydrochloride derivative in aniline. This production is very complicated and does not proceed satisfactorily. This bisphenol class thus has the technical disadvantage of being very cumbersome to access. - -
• R 1 is independently hydrogen or Ci-Cio alkyl, preferably hydrogen or Ci-C ⁇ alkyl, more preferably hydrogen or Ci-C 4 alkyl, most preferably hydrogen or methyl
• R 2 is Ci-Cio alkyl, preferably CpC 6 alkyl, particularly preferably Ci-C 4 alkyl, in each case optionally substituted phenyl or benzyl, in particular methyl, phenyl or
• Alkyl in the sense of the present invention is in each case linear or branched.
• R 2 particularly preferably represents phenyl which is optionally substituted by the radicals mentioned in R 1 , represented by the formula (Ic) and (Id) (mixture of isomers).
• R * has the meaning given above.
• These bisphenols of the formula (1) according to the invention can be prepared from phenol derivatives and N-substituted isatin derivatives in an acid-catalyzed reaction. This can be done by means of analogous reactions which are described for the preparation of unsubstituted isatin bisphenols (HN Song et al., Synthetic Communications 1999, 29 (19), 3303 and R. Berendes, H. Klös, Patent Specification No. 488760, German Reich Patent Office Reich 1930).
• the synthesis of the bisphenols according to the invention is preferably carried out as a condensation reaction of corresponding phenols and isatin derivatives, as the following example shows: - -
• the condensation with hydrochloric acid as the acidic catalyst at temperatures between 0 and 6O 0 is very particularly preferably carried out C with a stoichiometric ratio of phenol derivative to ketone derivative of 10 to 1, wherein as sulfur-containing compound preferably a mercaptan or thiocarboxylic compound (z. B. Dodecylmercaptan, mercaptopropionic acid or thioacetic acid) is present, preferably only in about 0.01 to 25% based on the ketone compound.
• the hydrochloric acid is most preferably introduced as HCl gas.
• the condensation can be carried out in bulk or in solution.
• Inert solvents such as chlorinated hydrocarbons such as methylene chloride, dichloroethane or toluene, xylenes or chlorobenzenes are used.
• reaction is conducted in bulk with an excess of phenol.
• N-phenylisatin Another possibility for synthesizing N-phenylisatin is the use of commercially available isatin (eg BASF AG) in the form of an N-arylation reaction.
• isatin eg BASF AG
• organometallic syntheses are available.
• N-phenylisatin Another possibility for synthesizing N-phenylisatin is the use of the isonitrosoacetanilide-isatin process (previously for the preparation of indigo, Traugott Sandmeyer, Geigy Basel 1919). The following reaction steps are carried out:
• N-phenylisatin is via the reaction stage of a nitrone. The following reaction steps are carried out:
• phenols used are known or can be prepared by methods known from the literature, for example by alkylation according to Friedel Crafts (Organikum, Organisch-chemisches Grundpraktikum, Corrected reprint of the 20th edition, Wiley-VCH, Weinheim, p. 355, 1999) many phenols are also commercially available (suppliers eg Aldrich, Fluka, Acros etc.).
• the isatin derivatives used are likewise known or can be prepared by processes known from the literature, for example by alkylation of the corresponding isatin parent. For example, they are accessible from the corresponding sodium or potassium salts of the isatin parent compound by reaction with alkyl halides in absolute alcohol (G. Heller, O. Nötzel, Ber. Dtsch. Chem. Ges. 1907, 40, 1294).
• alkyl halides in absolute alcohol G. Heller, O. Nötzel, Ber. Dtsch. Chem. Ges. 1907, 40, 1294.
• An alternative possibility of synthesis is the alkylation via O-alkylated isourea derivatives (E. Vowinkel, Chem. Ber. 1966, 99, 1479 or L. J. Mathias, Synthesis 1979, 561).
• N, N'-dicyclohexylcarbodiimide can be obtained by reacting N, N'-dicyclohexylcarbodiimide with an alcohol in the presence of copper (I) chloride (E. Schmidt, F. Moosmüller, Liebigs Ann. Chem. 1955, 597, 235).
• copper (I) chloride E. Schmidt, F. Moosmüller, Liebigs Ann. Chem. 1955, 597, 235.
• Some N-substituted isatins are also commercially available (suppliers eg ChemPur GmbH, Düsseldorf, Germany or Alfa Aesar, Düsseldorf Germany or Sigma-Aldrich or Lancaster Synthesis Ltd. Newgate, United Kingdom).
• polycarbonates or copolycarbonates which are prepared using the bisphenols according to the invention and the corresponding preparation processes.
• the (co) polycarbonates according to the invention are based on bisphenols of the general formulas (Iai) and (Ibi) (mixture of isomers) as a recurring monomer unit
• R 1 and R 2 are as defined above.
• Preferred bisphenols are also those mentioned above.
• bisphenols of the formula (2) may be present as further monomer unit in addition to one or more bisphenols of the formula (1):
• R3 and R4 independently of one another are H, C1-C18-alkyl, C1-C18-alkoxy, halogen, such as Cl or Br, or each optionally substituted aryl or aralkyl, preferably H or
• C 1 -C 12 -alkyl particularly preferably H or C 1 -C 8 -alkyl and very particularly preferably H or methyl
• X is a single bond, -SO 2 -, -CO-, -O-, -S-, C 1 - to C 6 -alkylene, C 2 - to C 5 -alkylidene or C 5 - to C 6 -cycloalkylidene, which with C r to C 6 alkyl, preferably methyl or ethyl may be substituted, further for C 6 - to C 2 -arylene, which may be optionally fused with further heteroatom-containing aromatic rings is.
• X is preferably a single bond, C 1 to C 5 -alkylene, C 2 to C 5 -alkylidene, C 5 to C 6 -cycloalkylidene, -O-, -SO-, -CO-, -S-, - SO 2 -, or one for a radical of the formula (Ib)
• R 5 and R are individually selectable for each X 1 , independently of one another are hydrogen or C 1 -C 4 -alkyl, preferably hydrogen, methyl or ethyl, and
• n is an integer from 4 to 7, preferably 4 or 5, with the proviso that on at least one atom X 1 , R 5 and R 6 are simultaneously alkyl.
• Preferred diphenols of the formula (2) are, for example, 4,4'-dihydroxybiphenyl (DOD), 4,4'-dihydroxybiphenyl ether (DOD ether), 2,2-bis (4-hydroxyphenyl) propane (bisphenol A), 1 , 1-bis- (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane (bisphenol TMC), 1,1-bis (4-hydroxyphenyl) -cyclohexane, 2,4-bis- (4-hydroxyphenyl) -2 -methylbutane, 1,1-bis (4-hydroxyphenyl) -1-phenylethane, 1,1-bis [2- (4-hydroxyphenyl) -2-propyl] benzene, 1,3-bis [2- (4 -hydroxyphenyl) -2-propyl] -benzene (bisphenol M), 2,2-bis (3-methyl-4-hydroxyphenyl) -propane, 2,2-bis (3-chloro-4-hydroxyphenyl) propane , Bis
• bisphenols are, for example, 2,2-bis (4-hydroxyphenyl) propane (bisphenol A), 4,4'-dihydroxybiphenyl (DOD), 4,4'-dihydroxybiphenyl ether (DOD ether), 1,3-
• the bisphenols of the formula (1) can be used both alone and in admixture with one another or in admixture with one or more bisphenols of the formula (2);
• polycarbonates are to be understood as meaning both homopolycarbonates and copolycarbonates.
• Copolycarbonates generally contain, in addition to a diphenol selected from compounds of the formula (1), up to 95 mol%, preferably up to 80 mol%, particularly preferably up to 70 mol%, of at least one further diphenol selected from compounds of the formula (2) (based on the sum of the moles of diphenols used).
• the copolycarbonates preferably contain as the lower limit at least 5 mol%, in particular 10 mol% (based on the sum of the moles of diphenols used) selected from compounds of the formula (2).
• Particularly preferred copolycarbonates contain 40-60, in particular 45-55 mol% of diphenol of the formula (1) and 60-40, in particular 45-55 mol% of diphenol of the formula (2) (based on the sum of the moles of diphenols used).
• the copolycarbonate may also be prepared from a mixture of three bisphenols, one being from the class of N-substituted isatinebisphenols and the other two being from the bisphenols described above.
• This is very particularly preferably the combination of the bisphenol structure (Ib) with bisphenol A and bisphenol TMC.
• Class of N-substituted isatin bisphenols and 25 mole% bisphenol TMC is most preferred.
• the polycarbonates and copolycarbonates according to the invention generally have weight average molecular weights of 2,000 to 200,000, preferably 3,000 to 150,000, in particular 5,000 to 100,000, very particularly preferably 8,000 to 80,000, in particular 12,000 to 70,000 ( determined according to GPC with polycarbonate calibration).
• the diphenols are known from the literature or can be prepared by methods known from the literature (see, for example, BHJ Buysch et al., Ullmann's Encyclopedia of Industrial Chemistry, VCH, New York 1991, 5th Ed., Vol. 19, p.
• the polycarbonates or copolycarbonates can also be branched. For this purpose, certain small amounts, preferably amounts between 0.05 and 5 mol%, more preferably 0.1 to 3 mol%, most preferably 0.1 to 2 mol%, based on the moles of diphenols used, of trifunctional compounds such z.
• Isatin biscresol (IBK) or phloroglucinol 4,6-dimethyl-2,4,6-tri- (4-hydroxyphenyl) -hepten-2; 4,6-dimethyl-2,4,6-tri- (4-hydroxyphenyl) -heptane; l, 3,5-tri- (4-hydroxyphenyl) benzene; 1, 1, 1-tri- (4-hydroxyphenyl) -ethane (THPE); Tri- (4-hydroxyphenyl) -phenylmethane; 2,2-bis [4,4-bis (4-hydroxyphenyl) -cyclohexyl] -propane; 2,4-bis- (4-hydroxyphenyl-isopropyl) -henol; 2,6-bis- (2-hydroxy-5'-methyl-benzyl) -4-methyl phenol; 2- (4-hydroxyphenyl) -2- (2,4-dihydroxyphenyl) -propane; Hexa- (4- (4-hydroxyphenyl-isoprop
• Isatin biscresol and l, l, l-tri- (4-hydroxyphenyl) ethane and bis (3-methyl-4-hydroxyphenyl) -2-oxo-2,3-dihydroindole are preferably used as branching agents.
• branching agents results in branched structures.
• the resulting long chain branching leads to rheological properties of the resulting polycarbonates, which manifests itself in an intrinsic viscosity compared to linear types.
• the present invention furthermore relates to a process for the preparation of the polycarbonates and copolycarbonates according to the invention, which comprises dissolving bisphenols and possibly branching agents in aqueous alkaline solution and reacting with a carbonate source, optionally dissolved in a solvent, such as phosgene in a two-phase mixture of an aqueous alkaline solution. an organic solvent and a catalyst, preferably an amine compound, are reacted. The reaction can also be carried out in several stages.
• Such methods for the production of polycarbonate are basically z. B. two-phase interface method. From H. Schnell, Chemistry and Physics of Polycarbonates, Polymer Reviews, Vol. 9, Interscience Publishers, New York 1964 p.
• the concentration of the bisphenols in the aqueous alkaline solution is from 2 to 25% by weight, preferably from 2 to 20% by weight, more preferably from 2 to 18% by weight, and very particularly - - Preferably 3 to 15 wt .-%.
• the aqueous alkaline solution consists of water in which hydroxides of alkali or alkaline earth metals are dissolved. Preference is given to sodium and potassium hydroxides.
• the volume ratio of aqueous alkaline solution to organic solvent is 5:95 to 95: 5, preferably 20:80 to 80:20, more preferably 30:70 to 70:30, and most preferably 40:60 to 60 : 40th
• Bisphenol to phosgene is less than 1:10, preferably less than 1: 6, more preferably less than 1: 4, and most preferably less than 1: 3.
• concentration of the inventive branched polycarbonates and copolycarbonates in the organic phase is 1.0 to
• the concentration of the amine compound is 0.1 to 10 mol%, preferably 0.2 to 8 mol%, particularly preferably 0.3 to 6 mol% and very particularly preferably 0.4 to 5 mol%.
• the carbonate source is phosgene, diphosgene or triphosgene, preferably phosgene.
• phosgene it may be possible to dispense with a solvent and to introduce the phosgene directly into the reaction mixture.
• the catalyst used can be tertiary amines, such as triethylamine or N-alkylpiperidines. Suitable catalysts are trialkylamines and 4- (dimethylamino) pyridine. Particularly suitable are triethylamine, tripropylamine, triisopropylamine, tributylamine, triisobutylamine, N-methylpiperidine, N-ethylpiperidine, and N-propylpiperidine.
• organic solvents are halogenated hydrocarbons such as methylene chloride and / or chlorobenzene, dichlorobenzene, trichlorobenzene or mixtures thereof or aromatic hydrocarbons such.
• halogenated hydrocarbons such as methylene chloride and / or chlorobenzene, dichlorobenzene, trichlorobenzene or mixtures thereof or aromatic hydrocarbons such.
• the reaction temperature may be -5 ° C to 100 0 C, preferably from 0 0 C to 80 0 C more preferably from 10 0 C to 70 0 C and most preferably from 10 0 C to 60 0 C amount.
• the polycarbonates according to the invention can also be prepared by the melt transesterification process.
• the melt transesterification process is described, for example, in the Encyclopedia of Polymer Science, Vol. 10 (1969), Chemistry and Physics of Polycarbonates, Polymer Reviews, H. Schnell, Vol. 9, John Wiley and Sons, Inc. (1964) and DE-C 10 31 512 described.
• the aromatic dihydroxy compounds already described in the phase boundary process are transesterified in the melt with carbonic acid diesters with the aid of suitable catalysts and optionally further additives
• Carbonic acid diesters according to the invention are those of the formula (6) and (7)
• Diphenyl carbonate tert-butylphenyl-phenylcarbonate, di-tert-butylphenylcarbonate, phenylphenol-phenylcarbonate, di-phenylphenolcarbonate, cumylphenyl-phenylcarbonate, di-cumylphenylcarbonate,
• the proportion of carbonic acid ester is 100 to 130 mol%, preferably 103 to 120 mol%, particularly preferably 103 to 109 mol%, based on the dihydroxy compound.
• onium salts As catalysts in the context of the invention, basic catalysts such as, for example, alkali metal and alkaline earth metal hydroxides and oxides but also ammonium or phosphonium salts, referred to below as onium salts, are used in the melt transesterification process as described in the cited literature. Onium salts, particularly preferably phosphonium salts, are preferably used here. Phosphonium salts in the context of the invention are those of the formula (8)
• R M have the same or different Ci-C I0 alkyls, C 6 -C 0 -ATyIe, C 7 -C] 0 aralkyls or C 5 -C 6 - Cycloalkyls can be, preferably methyl or C 6 -Q 4 -ATyIe, particularly preferably methyl or phenyl, and
• X is an anion such as hydroxide, sulfate, hydrogen sulfate, hydrogen carbonate, carbonate, a halide, preferably chloride, or may be an alcoholate of the formula OR, wherein R is C 6 - C) 4 aryl or C 7 -C 2 -aralkyl, preferably phenyl , which may be preferred catalysts
• Tetraphenylphosphonium phenolate more preferably tetraphenylphosphonium phenolate.
• the catalysts are preferably used in amounts of from 10.sup.- 8 to 10.sup.- 3 mol, based on one mole of bisphenol, particularly preferably in amounts of from 10.sup.- 7 to 10.sup.- 2 mol. - -
• catalysts can be used alone or optionally in addition to the onium salt to increase the rate of polymerization.
• These include salts of alkali metals and alkaline earth metals, such as hydroxides, alkoxides and aryloxides of lithium, sodium and potassium, preferably sodium hydroxide, alkoxide or aryloxide salts. Most preferred are sodium hydroxide and sodium phenolate.
• the amounts of cocatalyst can range from 1 to 200 ppb, preferably from 5 to 150 ppb, and most preferably from 10 to 125 ppb, each calculated as sodium.
• the transesterification reaction of the aromatic dihydroxy compound and the carbonic diester in the melt is preferably carried out in two stages.
• the melt takes up the aromatic dihydroxy compound and the carbonic acid at temperatures of 80 to 250 0 C, preferably 100 to 230 0 C, particularly preferably 120 to 19O 0 C under normal pressure in 0 to 5 hours, preferably 0, 25 to 3 hours instead.
• the catalyst is prepared by applying a vacuum (up to 2 mm Hg) and increasing the temperature (up to 260 0 C) by distilling off the monophenol, the oligocarbonate of the aromatic dihydroxy compound and the carbonic acid diester. In this case, the majority of vapors from the process accrue.
• the oligocarbonate thus prepared has an average molecular weight M w (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) in the range from 2000 g / mol to 18 000 g / mol, preferably from 4 000 g / mol to 15,000 g / mol.
• the catalysts can also be used in combination (two or more) with each other.
• alkali / alkaline earth metal catalysts When using alkali / alkaline earth metal catalysts, it may be advantageous to add the alkali / alkaline earth metal catalysts at a later time (eg, after the oligocarbonate synthesis in the second stage polycondensation).
• the reaction of the aromatic dihydroxy compound and the carbonic acid diester to form the polycarbonate can be carried out batchwise or preferably continuously, for example in stirred vessels, thin-film evaporators, falling-film evaporators, stirred tank cascades, extruders, kneaders, simple disk reactors and high-viscosity disk reactors.
• branched poly- or copolycarbonates can be prepared by using polyfunctional compounds.
• Preferred, particularly preferred or very particularly preferred are embodiments which make use of the parameters, compounds, definitions and explanations mentioned under preferred, particularly preferred or very particularly preferred or, preferably, etc.
• polycarbonates and copolycarbonates according to the invention can be worked up in a known manner and processed to give any shaped articles, for example by extrusion, injection molding or extrusion blow molding.
• polycarbonates and copolycarbonates according to the invention may also be blended with other aromatic polycarbonates and / or other aromatic polyester carbonates and / or other aromatic polyesters in a known manner, for example by compounding.
• the polycarbonates and copolycarbonates according to the invention may also be added in conventional amounts to the customary additives for these thermoplastics, such as fillers, UV stabilizers, heat stabilizers, antistatic agents and pigments; if appropriate, the demolding behavior, the flow behavior, and / or the flame retardancy can be improved by adding external mold release agents, flow agents, and / or flame retardants (eg, alkyl and aryl phosphites, phosphates, phosphanes, low molecular weight carboxylic acid esters, halogen compounds, salts Chalk, quartz powder, glass and carbon fibers, pigments and combinations thereof Such compounds are described, for example, in WO 99/55772, pages 15-25, and in the corresponding chapters of the "Plastics Additives Handbook", ed , 5 ⁇ Edition 2000, Hanser Publishers, Kunststoff.).
• polycarbonates and copolycarbonates according to the invention if appropriate in admixture with other thermoplastics, such as, for example, graft polymers based on acrylonitrile / butadiene / styrene or acrylate rubber-based graft copolymers (see, for example, the graft polymers described in EP-A 640 655) and / or conventional additives, can processed to any shaped articles / extrudates used wherever already known polycarbonates, polyester and polyester are used. Further possible applications of the polycarbonates according to the invention are: 1. Safety discs, which are known to be required in many areas of buildings, vehicles and aircraft, as well as shields of helmets.
• polycarbonates with a content of glass fibers, which optionally additionally about 1 to 10 wt .-% MoS 2 , based on total weight.
• optical device parts in particular lenses for photo and film cameras (see for example DE-A 2 701 173).
• optical fiber cable see, for example, EP-A 0 089 801).
• headlamps as so-called “head-lamps”, scattered light lenses or inner lenses, and linear luminaires.
• dialyzers for medical applications, eg. As oxygenators, dialyzers.
• bumpers optionally in the form of suitable blends with ABS or suitable rubbers.
• the moldings or moldings and extrudates of the polymers according to the invention are likewise the subject of this application. Examples
• reaction mixture is precipitated in water, the crude product is filtered off with suction and washed 3 times with distilled water, again strongly filtered off with suction and then dried at 70 ° C. in a vacuum drying oven.
• the compound 2,2-bis (4-hydroxyphenyl) -1-phenyl-1H-indol-3-one is formed in the condensation of N-phenylisatin with phenol as a minor component.
• the compound (2a) as the trimethylsilyl derivative has a molecular weight of 537 g / mol.
• the GC one finds another peak with a shorter retention time, which after examination by mass spectrometry also as trimethylsilylderivat the molecular weight of 537 - - has g / mol.
• This isomer has the structure according to Example (2b).
• Example 2 In order to obtain sufficient quantities of bisphenol from the example of a continuous process, the batch of Example 2 was repeated several times.
• BUP p-tert-butylphenol
• Example 3 In order to obtain sufficient amounts of polycarbonate in a laboratory (limited capacity), the procedure of Example 3 was repeated several times.
• the polycarbonates obtained therefrom are characterized as follows:
• Example 3 In order to obtain sufficient amounts of polycarbonate in a laboratory (limited capacity), the procedure of Example 3 was repeated several times.
• the polycarbonates obtained therefrom are characterized as follows:
• the copolycarbonate according to Example 9 is extruded into granules and then sprayed after predrying for 4 hours at 130 0 C to round specimens (diameter: 2 cm, thickness 3 mm). On the test specimens thus obtained, a layer of 200 nm aluminum is sputtered. An adhesive tape type 3M 853 from 3M is applied to this metal layer. To test the metal adhesion of this tape is removed immediately after application again.
• Comparative test specimen After removal of the adhesive tape, no remainder of the sputtered aluminum can be seen on the comparative specimen. The aluminum coating hangs completely on the tape.

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