KR20020083183A - Polyester Carbonate And A Data Carrier Therefrom - Google Patents

Abstract

The present invention relates to a machine-readable data carrier comprising a substrate consisting of copolyester carbonate comprising units based on hydrogenated dimer fatty acids. This advanced data carrier offers the possibility of recording data when the data storage density is high.

Description

Polyester Carbonate And A Data Carrier Therefrom

Polycarbonates are preferably used in the field of machine-readable data carriers, for example compact discs. In order to use for this purpose, the material must have high transparency, low hydrophilicity, good heat resistance and low double refraction. New storage technologies established with increasing data density, such as CD-ROM (Read Only), CD-R (Writable), CD-RW (Rewritable), Digital Versatile Disk (DVD) and MO-Disk (magnetooptical) will develop, and the requirements for the base material will be more stringent.

In the formats described above (eg CD-ROM), the information is engraved directly in a transparent thermoplastic material (eg bisphenol A (BPA) polycarbonate) in the form of so-called pit. This surface is then coated with a reflective metal film, wherein the digital information is coded by the length and position of the pit and optically read by a low power (about 0.5 mW) focused laser beam. Stored information can no longer be changed (read-only format).

One way of working in a write once format, such as CD-R, is to record permanent markings on a thin film applied to the disc using a focused laser beam (40 mW or less). The change (absorbance, reflectivity) of the optical properties generated thereby can be detected using a readout laser. Because of the irreversible process, storing information is only possible once, and therefore cannot be overwritten (WORM principle, write once, read many).

Recordable media several times are particularly important in the computer industry. Two types of systems are currently in widespread use: magneto-optical (MO) systems and phase-change (PC) systems. In the MO storage mode, bits are stored in a magnetic region of approximately 1 μm size that is top magnetized or bottom magnetized on an evaporation coating layer (among others amorphous alloys of rare earth metals and transition metals). The magnetization state is maintained by heating above the Curie temperature and then cooling in a variable magnetic field. Information stored in this manner is optically read by the rotation of the polarization plane in a magnetic thin layer. This so-called magneto-optical Kerr effect generally results in polarization rotations of less than 0.5 °. The base material causing the reflection is likewise in this case causing a particularly disturbing change in polarization. For this reason, base materials with low reflectance are particularly important in MO systems.

In the case of using a phase change material, information is stored in regions with different phases (generally amorphous or crystalline). An alloy or compound of tellurium whose glass transition temperature is close to the crystallization temperature is generally used as the information layer. The film can be heated from above the melting point and cooled rapidly using a simple focused laser pulse to locally convert from the crystalline state to the amorphous state. Reflectivity changes compared to the crystalline state, which can be optically detected using a laser.

In addition to the above, the margin of error allowed for the geometrical characteristics of the ray path during the writing and reading process is narrow. Changes in ambient conditions, such as temperature and humidity, can cause the disk to deform, which adversely affects the writing and reading process. The base material swells when uptakes moisture and thus increases in volume, which is manifested when the disc is warped, especially in the case of asymmetrically produced storage formats. Therefore, the low water adsorption rate of the polymer is a further important property to be realized.

In recent developments in the field of optical data carriers, the requirements for carrier materials have become more stringent and will achieve the purpose of further development of new materials, for example lowering reflectance and reducing moisture absorption. It is expected that the wavelength of recording and reading will be shorter, especially in the future, all of which impose new requirements.

However, important properties for substrate materials in the field of optical data carriers include low reflectivity and reduced moisture adsorption as well as additional properties such as high transparency, heat resistance, flowability, toughness, high purity, low density. Low levels of non-uniformity or particle problems, and above all possible best combinations of reduced raw material usage and reduced manufacturing costs are important.

Materials currently proposed for this use are not satisfactory under one or more of the above conditions, and there is a need for new materials having higher storage densities.

Polyester carbonates consisting of linear or cyclic bifunctional aliphatic carboxylic acids, bisphenols and carbonate precursors are disclosed, for example, in EP 433 716 A, US 4 983 706 and US 5 274 068. These documents also disclose their various synthetic methods. Those skilled in the art know that the glass transition temperature decreases and the flowability increases when dicarboxylic acids are included. However, when used as the base material, decreasing the glass transition temperature limits the usability of the disc, since their heat resistance is reduced. In addition, these products have unacceptably high moisture adsorption properties for use as optical data storage media due to polar ester groups. As disclosed in EP 433 716 A, carboxylic acids known for polyester carbonates can only be included in significant amounts by complex and expensive multistage processes in the phase boundary process.

Furthermore, polyester carbonates, especially polyester carbonates made from linear and relatively long chain dicarboxylic acids, tend to crystallize, which is undesirable, which crystallization in particular forms microstructures and process-dependent cyclic reflections. It interferes with the very slow cooling process that may be necessary to reduce the

Dimeric fatty acids as possible acidic constituents in polyester carbonates are disclosed, for example, in DE 43 06 961 A, US 5 134 220 and EP 443 058 A. No more precise definition of the acid used is disclosed. However, when using non-hydrogenated dimeric fatty acids, thermal oxidation problems arise. In addition, commercially available products include more than 3 mole percent of trivalent basic and polybasic carboxylic acids, which increase zero shear viscosity, which leads to fine structures such as pits or grooves. It is not desirable when preparing. For this reason, the polyester carbonate has been judged to be unsuitable for use as a substrate of optical data storage media in general.

The present invention relates to novel polyester carbonates, machine-readable data carriers comprising them and molded parts comprising them.

It is an object of the present invention to provide a machine-readable data carrier which does not have the disadvantages mentioned above, in particular has improved optical properties and has a high data density which can be produced simply and efficiently.

This object is achieved by a data carrier containing a resin comprising a polyester carbonate having a bifunctional repeating unit A of formula (I).

Wherein D represents a mixture of divalent hydrocarbon radicals having 30 to 42, preferably 32 to 38, particularly preferably 34 carbon atoms. D substantially corresponds to formulas Ia and / or Ib, and / or Ic and / or Id and / or Ie.

Wherein E ₁ , E ₂ , E ₃ and E ₄ of formulas Ic and Id are substituents-(CH ₂ ) _i -,-(CH ₂ ) _j -,-(CH ₂ ) _k CH ₃ and-(CH ₂ ) _l represents one of CH ₃ and a, b, c, d, e, f, g, h, i, j, k, l, m, n, o and p independently represent an integer of 1 to 10 .

Substrates comprising polyester carbonates according to the invention with difunctional repeating units derived from hydrogenated dimeric fatty acids having a high fraction of aromatic bisphenols and difunctional acids surprisingly have particularly low water adsorption properties, extremely low reflectance, It has been found to have characteristics of very low crystallization tendency, low reflection index, good flowability and low density.

Certain bisphenols [eg 1,1-bis- (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane or 6,6'-dihydroxy-3,3,3 ', 3'-tetramethyl -1,1'-spiro (bis) -indane] high glass transition temperature of the homopolycarbonate co-condensed with the very small mole fraction of acid used according to the present invention to improve the fluidity and heat resistance of the optical data carrier Can be effectively reduced to an acceptable level.

Substrates of data carriers made from these novel polyester carbonates also have high transparency, good mechanical properties, especially at low temperatures, and high flowability.

Hydrogenated dimeric fatty acids of the present invention are acids obtainable by dimerizing unsaturated monobasic fatty acids having 16 to 22 carbon atoms, followed by hydrogenation. Necessary acids can be obtained for example from plants or animals. Synthesis methods and properties are described, for example, in Encyclopaedia of Chemical Technology, Vol. 8, 4th ed., John Wiley & Sons: 1993, pp. 223-237.

Unlike the structural elements mentioned in formula I, the dimeric fatty acids may comprise a small fraction of unsaturated aliphatic groups. Dimeric fatty acids with an iodine number of less than 15 are preferred.

In addition, the dimeric fatty acids may comprise small amounts of monovalent basic and polybasic fatty acids. Products in which these components are contained in very small amounts, in particular products having very small amounts of tribasic and polybasic acids, are particularly suitable for producing the polyester carbonates according to the invention. As a result of gas chromatography, dimeric fatty acids comprising less than 1.5% of trivalent and polybasic acids are preferred. The invention also relates to dimeric fatty acids and other bifunctional carboxylic acids having 4 to 40 carbon atoms (e.g. adipic acid, sebacic acid, α, ω-dodecanoic dicarboxylic acid, terephthalic acid, cis- or trans- 9-octadeken-α, ω-dicarboxylic acid), or mixtures with hydroxycarboxylic acids (salicylic acid or p-hydroxybenzoic acid) having 4 to 40 carbon atoms.

Dimeric fatty alcohols obtained by reducing dimeric fatty acids can also be used within the scope of the invention, can be converted to polycarbonates, or polyester carbonates of mixtures of dimeric fatty alcohols and esters of dimeric fatty acids Can be converted to

It is preferred to use at least one difunctional structural unit of formula (II) other than A as a bifunctional structural unit B.

Wherein the radical -ORO- represents any diphenolate radical, wherein R is an aromatic radical having 6 to 40 carbon atoms, which contains one or more aromatic or condensed aromatic nuclei (optionally comprising heteroatoms) And optionally substituted with C _1-12 alkyl radicals or halogens, and may include heteroatoms as aliphatic radicals, cycloaliphatic radicals, aromatic nuclei or bridge members.

It is particularly preferable that the bifunctional structural unit B is derived from diphenol compounds of the formulas (IIIa) to (IIIc).

Where

Z ₁ and Z ₂ in each case independently of each other are a divalent radical -C (R ₂ R ₂ )-, -O-, -S-, -N (R ₂ )-, -N- (R ₂ ) C ( = O)-,

R ² independently of each other at each occurrence is a C _1-12 alkyl radical (preferably a C _1-3 alkyl radical, particularly preferably methyl), a C _6-19 aryl radical (preferably _{phenylradical} ), C _{7 -12} aralkyl radicals (preferably phenyl-C _1-4 -alkyl, particularly preferably benzyl radicals), hydrogen, halogen, preferably chlorine or bromine,

U and V are independently of each other an integer from 0 to 3, preferably 1 or 2,

W and X independently of each other represent an integer of 0 to 3, preferably 0,

Y is a single bond, a C _1-6 -alkylene radical, a C _2-5 -alkylidene radical (which may be substituted with a C _1-6 -alkyl, preferably methyl or ethyl radical) or C _6-12- Arylene radicals (which may optionally be condensed with additional aromatic rings comprising heteroatoms).

Examples of diphenols of the formulas (IIIa), (IIIb) and (IIIc) that may be mentioned include

4,4'-dihydroxydiphenyl,

2,2-bis- (4-hydroxyphenyl) -propane,

2,4-bis- (4-hydroxyphenyl) -2-methylbutane,

2,2-bis- (3-methyl-4-hydroxyphenyl) -propane,

1,1-bis- (3-methyl-4-hydroxyphenyl) -cyclohexane,

2,2-bis- (3-chloro-4-hydroxyphenyl) -propane,

Bis- (3,5-dimethyl-4-hydroxyphenyl) -methane,

2,2-bis- (3,5-dimethyl-4-hydroxyphenyl) -propane,

2,4-bis- (3,5-dimethyl-4-hydroxyphenyl-2-methylbutane,

2,2-bis- (3,5-dichloro-4-hydroxyphenyl) -propane,

2,2-bis- (3,5-dibromo-4-hydroxyphenyl) -propane,

1,1-bis- (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane and

1,1-bis- (4-hydroxyphenyl) -cyclohexane,

6,6'-dihydroxy-3,3,3 ', 3'-tetramethyl-1,1'-spiro (bis) -indane,

1- (p-hydroxyphenyl) -1,3,3-trimethyl-5-indanol and

9,9-bis- (4-hydroxyphenyl) fluorene.

Preferred diphenols of formulas (IIIa), (IIIb) and (IIIc) are

2,2-bis- (4-hydroxyphenyl) -propane,

2,2-bis- (3,5-dimethyl-4-hydroxyphenyl) -propane,

1,1-bis- (4-hydroxyphenyl) -cyclohexane,

1,1-bis- (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane,

6,6'-dihydroxy-3,3,3 ', 3'-tetramethyl-1,1'-spiro (bis) -indane,

9,9-bis- (4-hydroxyphenyl) fluorene,

1,1-bis- (3-methyl-4-hydroxyphenyl) -cyclohexane,

1- (p-hydroxyphenyl) -1,3,3-trimethyl-5-indanol and

4,4 '(m-phenylenediisopropylidene) -diphenol.

The diphenols can be used alone or as a mixture of several diphenols for the preparation of the substrate according to the invention.

Particular preference is given to the carbonate structural units of formula (II) derived from 1,1-bis- (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane.

In addition, derivatives substituted once or several times with bifunctional monophenols such as resorcinol, hydroquinone or their C _1-12 -alkyl, C _6-19 -aryl or C _7-19 -aralkyl are also provided herein. It can be used to prepare a substrate according to.

Preferred polyester carbonates according to the invention are 0.5 to 49 mol%, preferably 2 to 40 mol%, particularly preferably 5 to 20 mol%, based on 100% of the bifunctional structural units A and B. It includes structural unit A of.

The substrates according to the invention are described in three known methods [H. Schnell "Chemistry and Physics of Polycarbonatees", Polymer review, Volume IX, p. 27 ff; Interscience Publishers, New York 1964, DE 14 95 626 A, DE 22 32 877 A, DE 27 03 376 A, EP 274 544 A, DE 30 00 610 A, DE 38 32 396 A).

1. Solution Method in Disperse Phase Known as "2-Phase Interface Method"

In this process, the diphenols and difunctional acids to be used are dissolved in an aqueous alkali phase. In addition, optionally the chain terminators necessary for the preparation of the polyester carbonates according to the invention can be prepared in an aqueous alkaline phase, preferably in an amount of 1.0 to 20 mol%, based on the mole number of diphenols + acids according to the invention. It is dissolved in an aqueous sodium hydroxide solution or added in bulk to an aqueous alkaline phase and an inert organic phase. The reaction with phosgene is then carried out in the presence of an organic phase in which an inert substance, preferably polycarbonate, is dissolved. Reaction temperature is 0 degreeC-50 degreeC.

The necessary chain terminators, branching agents and acids according to the invention can be added in bulk, in melt, or in solutions in alkaline or inert organic solvents during the phosgenation reaction or during the presence of chlorocarbonate in the synthesis mixture.

This reaction can be accelerated using a catalyst such as a tertiary amine or onium salt. Tributylamine, triethylamine and N-ethylpiperidine, and tetrabutylammonium, tetraethylammonium and N-ethylpiperidinium salts are preferred.

In addition to or in place of diphenols, their chlorocarbonates and / or bischlorocarbonates can also be used or metered in during the synthesis process. Suitable solvents are, for example, methylene chloride, chlorobenzene, toluene and mixtures thereof.

2. Solution method in homogeneous phase (also known as "pyridine method")

In this case, the diphenols and acids according to the invention are dissolved in an organic base (such as pyridine), optionally with the addition of an additional organic solvent, which is then required to prepare the polyester carbonate according to the invention. The resulting chain terminator and branching agent are optionally added as described above.

Then react with phosgene. Reaction temperature is 10-50 degreeC. Suitable organic bases other than pyridine are, for example, triethylamine, tributylamine, N-ethylpiperidine and N, N-dialkyl-substituted aniline (eg N, N-dimethylaniline). Suitable solvents are, for example, methylene chloride, chlorobenzene, toluene, tetrahydrofuran, 1,3-dioxolane and mixtures thereof.

In addition to diphenols, up to 50 mol% of their bischlorocarbonates can be used, based on the phenols used. Fatty acids according to the invention can be partially or completely replaced by their acid chlorides.

The necessary chain terminators, branching agents and acids according to the invention can be added during bulk phosgenation reaction or in the presence of chlorocarbonate in the synthesis mixture, as a melt or as a solution in an inert organic solvent.

The polyester carbonates according to the invention are separated by known methods in the processes of 1 and 2 above. Suitable aftertreatment procedures are, in particular, precipitation, spray drying and drying of the solvent in vacuo.

3. Melt Transesterification Method

Diphenyl carbonate is added to the diphenyl melt / fatty acid in a chemical equivalent amount or in an excess of 40% or less, wherein phenol and optionally diphenyl carbonate are constantly distilled off in the melt transesterification reaction. The molecular weight is increased. This process can be carried out in a one step process or by conventional catalysts such as alkali metal ions (eg Li, Na, K), transition metal compounds (eg Sn, Zn, Ti based compounds), nitrogen bases or phosphorus It is carried out in a two-step process comprising possible separate condensation reactions of oligomers and polymers using bases, preferably ammonium salts and phosphonium salts, preferably phosphonium halides or phosphonium phenolates.

Instead of the acids used according to the invention, their aromatic or aliphatic esters can be used, for example methyl-, ethyl-, isopropyl- or phenyl esters.

In order to prepare the polyester carbonates according to the invention further chain terminators and / or branching agents can be used in a known manner. Corresponding chain terminators and / or branching agents are known from EP 335 214 A, DE 30 07 934 A, EP 411 433 A, DE 43 35 440 A and EP 691 361 A. Branching agents and / or chain terminators may also be replaced wholly or in part by dimeric fatty acids containing relatively high fractions of trifunctional and / or monofunctional carboxylic acids.

In addition, the substrate prepared from the polyester carbonate according to the present invention can be mixed with various thermoplastic polymers in a weight ratio of 2:98 to 98: 2, and can be used as a blend.

The polyester carbonate according to the present invention has an average molecular weight Mw (weight average molecular weight determined by gel chromatography after pre-calibration using bisphenol A-PC) of 6,000 or more, preferably 7,000 to 40,000, particularly preferably 9,000 To 30,000.

The following conventional additives for thermoplastic polycarbonates can be added to the substrates used to prepare the data carriers according to the invention in general amounts before, during or after their production process:

Stabilizers, for example thermal stabilizers (eg organic phosphites), optionally in combination with monomeric or oligomeric epoxides; UV stabilizers, especially UV stabilizers based on nitrogen containing heterocyclic compounds such as triazoles; Optical brighteners; Flame retardants, especially fluorine containing compounds such as perfluorinated salts of organic acids, polyperfluoroethylene, salts of organic sulfonic acids and combinations thereof; Mold release agents; Flow aids; Fire retardant; coloring agent; dyes; Antistatic agents; Fillers and reinforcing materials, milled minerals, fibrous materials such as alkyl and aryl phosphites, phosphates, phosphanes, low molecular weight carboxylic acid esters, halogen compounds, salts, lime, quartz, inorganic or organic nanoparticles, glass fibers And carbon fiber.

By means of injection molding or injection-compression molding using known machines, the data carriers or other molded parts according to the invention can be produced by known methods.

Derived from 1,1-bis- (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, with 0.5% to 49% by mole of bifunctional structural units A and B as 100%, preferably 2 to Polyester carbonates according to the invention containing structural units A and B, containing 40 mol%, particularly preferably 10 to 25 mol%, of bifunctional ester structural units A, prepare a data carrier according to the invention. Particularly preferred is because of their low rheooptical constant C _R and very low yellowness index YI. The yellow index is measured according to ASTM standard E 313/96 using a small 4 mm thick injection molded plate.

The substrate must be of high purity, in particular for producing the data carrier according to the invention. This high purity is achieved by reducing the content of residual monomers, solvents, foreign particles (particularly salts and dusts with inorganic or organic properties, in particular salts and dusts) and chlorine to the lowest possible levels in known processes in the workup and separation steps of the base resin. This is described, for example, in EP 380 002 A or EP 691 361 A, which are incorporated by reference.

The data carrier according to the present invention can be manufactured in various formats. Particular preference is given to known formats, for example optical cards or perforated discs, for example compact discs (CDs), recordable CDs (CD-Rs), digital versatile disks (DVDs) or mini discs ( MD).

Information storage layers (e.g., phase change layers, magneto-optical layers, dyes, fluorescent dyes, photopolymers), dielectrics (e.g. Si / N), reflectors (e.g. silver, gold or aluminum), partial reflectors (e.g. Si, Ge) or a protective layer (eg acrylic lacquer) and additional functional layers can be applied to the substrate. It is also possible to arrange these layers in a different order.

The various layers of the substrate may be laminated with each other or the layers may be laminated with other substrates. The stored information can be engraved into the substrate (eg, pit structures) or deposited into separate information layers. The information can be read through a transparent substrate or from the information side.

Optical information storage media wherein the substrate material according to the invention is used in the form of a film, for example to cover an information layer in direct video recording (DVR) or as a substrate (including optionally imprinted information) of a multilayer system, It is a topic.

The invention also relates to the polyester carbonates described above and other molded parts comprising them (for example optical lenses, sheets and films comprising the polyester carbonates according to the invention) and for producing such molded parts. It provides the use of said polyester carbonate. The excellent properties of the polyester carbonates are used in particular in optical lenses.

The following examples further illustrate the invention.

Determination of Rheological Optical Constant C _R

Reflectance is one of the most important optical properties in injection molded parts and can be described as a specific property through rheological optical constants, which can be positive or negative. The greater the absolute value of this constant, the greater the reflectance of the injection molded part. Methods of measuring rheological optical constants are known (see EP 0 621 297 A). Flat parellel 150-1000 μm thick specimens required for this purpose can be prepared by melt pressing or film casting.

The molecular weight can be determined by measuring the relative viscosity at a concentration of 100 g of 0.5 g / methylene chloride at 25 ° C. methylene chloride.

Tg is determined according to standard CEI / IEC 1074. The water adsorption rate is determined according to DIN 53 495 (Method 1 + 1L). Density is measured according to Archimedes principle (Mettler Density Kit).

The specifications for the hydrogenated dimeric fatty acids (Pripol 1009 registered by Uniqema) used are as follows:

Iodine <10, monomer content <0.1%, trimer content <1%.

Example 1:

The following polyester carbonates are prepared.

3036.2 g of sodium carbonate are dissolved in 12.2 kg of water and about 10 l of methylene chloride with gentle stirring in a vessel equipped with a stirrer. Then a solution of 1093.4 g of Pripol 1009 in 27 l of methylene chloride is added and the whole is stirred for 5 minutes. 944.5 g of phosgene are introduced with vigorous stirring at a temperature below 15 ° C. and a pH of 10-8 for about 30 minutes. A solution of 4035.7 g of 1,1-bis- (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, 1248 g sodium hydroxide and 25 l of water is pumped for 15 minutes. An additional 3214.8 g of phosgene is introduced over 70-80 minutes, at which time 30% sodium hydroxide solution is added to maintain the pH at 11-12. The reaction mixture is stirred for 5 minutes, then 58.6 g of 4-tert-butylphenol are added. After a further 5 minutes, 18 ml of N-ethylpiperidine is added and the whole is stirred for 30 minutes. The phases are then separated, the organic phase is acidified with water and washed until neutral, the solvent is removed and extruded to granulate.

Example 2

The following polyester carbonates are prepared.

2776.8 g of sodium carbonate are dissolved in 11.1 kg of water, 998.4 g of Pripol 1009 and 33.9 l of methylene chloride with gentle stirring in a vessel equipped with a stirrer. 863.2 g of phosgene are introduced with vigorous stirring for about 30 minutes at a temperature below 15 ° C. and a pH of 10-8. 2620.8 g 1,1-bis- (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, 1040 g 2,2 bis- (4-hydroxyphenyl) -propane, 1284 g sodium hydroxide And pump a solution of 22.7 l of water for 15 minutes. An additional 3214 g of phosgene is introduced over about 90 minutes, at which time 30% sodium hydroxide solution is added to maintain the pH at 11-12. The reaction mixture is stirred for 5 minutes, then 79 g of 4-tert-butylphenol are added. After a further 5 minutes, 18 ml of N-ethylpiperidine is added and the whole is stirred for 45 minutes. The phases are then separated, the organic phase is acidified with water and washed until neutral, the solvent is removed and extruded to granulate.

Comparative Example

3104.4 g of 1,1-bis- (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane are dissolved in 30.3 kg of water and 880 g of sodium hydroxide in a vessel equipped with a stirrer. Then 22.8 l of methylene chloride are added. 1978.3 g of phosgene are introduced with vigorous stirring at a temperature of 15 ° C.-20 ° C. and a pH of 11-13 for about 40 minutes. At this time, 30% sodium hydroxide solution is added to maintain the pH. The reaction mixture is stirred for 5 minutes, then 82.5 g of isooctylphenol are added. After a further 5 minutes, 20 ml of N-ethylpiperidine are added and the whole is stirred for 45 minutes. The phases are then separated, the organic phase is acidified with water and washed until neutral and the solvent is removed.

The resulting polyester carbonate and standard CD material (Makrolon CD 2005) have the properties shown in Table 1.

Example Composition [mol%] Glass transition temperature [℃] Rheological Optical Constant [1 / GPa] Relative Solution Viscosity Moisture adsorption rate [% by weight] Density [g / cm ³ ] n ²⁰ D Abbe No. BP-A BP-TMC Pripol 1009 After 24 hours saturation One 31 57 12 131 3.1 1.212 0.15 0.18 1.098 1.554 27.3 2 0 87 13 145 2.0 1.17 0.18 0.20 1.080 1.547 35.0 Comparative example 0 100 0 239 2.7 1.18 0.33 0.38 1.100 1.550 - CD 2005 100 0 0 145 5.4 1.20 0.25 0.34 1.200 1.582 31

Example 3

Compact disc manufacturers

The granular materials prepared in Examples 1 and 2 are made into compact disks (diameter: 118 mm, thickness: 1.2 mm) on a Netstal Diskjet injection molding machine at 320 ° C bulk temperature and 60 ° C apparatus temperature.

Comparative Example

For comparison purposes, compact discs are prepared from bisphenol A-PC (Makrolon CD 2005) under the conditions of Example 3.

The reflective properties disclosed in Table 2 were measured for these compact discs at a radius of 35 mm.

Example Δn (r, φ) (in-plane) [nm] Δn (r, z) (out-of-plane) [nm] Δn (r, φf) (out of plane) [nm] 3 -1.7 157 136 Comparative example 32 643 513

Claims (15)

Copolyester carbonates having a bifunctional repeating structural unit A derived from acids according to formula (I): <Formula I> Wherein D represents a mixture of divalent hydrocarbon radicals having 30 to 42 carbon atoms, substantially corresponding to the formulas Ia and / or Ib and / or Ic and / or Id and / or Ie, <Formula Ia> <Formula Ib> <Formula Ic> <Formula Id> <Formula Ie> Wherein E ₁ , E ₂ , E ₃ and E ₄ of formulas Ic and Id are substituents-(CH ₂ ) _i -,-(CH ₂ ) _j -,-(CH ₂ ) _k CH ₃ and-(CH ₂ ) _l represents one of CH ₃ and a, b, c, d, e, f, g, h, i, j, k, l, m, n, o and p independently represent an integer of 1 to 10 . The copolyester carbonate of claim 1 wherein the iodine number of the extract used as the bifunctional structural element A is less than about 15. 3. The copolyester carbonate of claim 1 wherein the fraction of functional groups greater than 2 in the extract used as bifunctional structural element A is less than about 1.5%. The copolyester carbonate of claim 1 wherein the glass transition temperature is from about 120 ° C. to 185 ° C. 5. The copolyester carbonate of claim 1 wherein the moisture adsorption rate at saturation is less than about 0.35%. 6. The nose according to claim 1, wherein the polyester carbonate comprises at least one further bifunctional structural unit B, different from A, according to formula (II). 7. Polyester carbonate: <Formula II> Wherein the radical -ORO- represents any diphenolate radical, wherein R is an aromatic radical having 6 to 40 carbon atoms, which contains one or more aromatic or condensed aromatic nuclei (optionally comprising heteroatoms) And optionally substituted with C _1-12 alkyl radicals or halogens, and may include heteroatoms as aliphatic radicals, cycloaliphatic radicals, aromatic nuclei or bridge members. The copolyester carbonate of claim 6 wherein said bifunctional carbonate structural units of formula (II) exhibit a glass transition temperature above about 170 ° C. as a homopolycarbonate. 7. A compound according to claim 6, wherein at least one of the bifunctional carbonate structural units B of formula (II) is derived from 1,1-bis- (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane Copolyester carbonate, characterized in that. A copolyester carbox according to claim 6, wherein at least one of the bifunctional carbonate structural units B of formula (II) is derived from 2,2-bis- (4-hydroxyphenyl) -propane. Bonate. 7. A compound according to claim 6, wherein at least one of the bifunctional carbonate structural units B of formula (II) is 6,6'-dihydroxy-3,3,3 ', 3'-tetramethyl-1,1' -Spiro (bis) -indane, 1,1-bis- (3-methyl-4-hydroxyphenyl) -cyclohexane or 1- (p-hydroxyphenyl) -1,3,3-trimethyl-5-indane Copolyester carbonate, characterized in that it is derived from ol. The copolyester carbo according to any one of claims 6 to 10, wherein the bifunctional structural unit A contains 0.5 to 49 mol% when the bifunctional structural units A and B are 100%. Nate. The copolyester carbonate according to any one of claims 1 to 11, wherein the weight average molecular weight Mw is 7,000 to 40,000. The glass transition temperature according to any one of claims 1 to 12, wherein when the bifunctional structural units A and B are 100%, 5-20 mol of the bifunctional structural unit A is used. And a weight average molecular weight Mw of 9,000 to 30,000. Molded parts, in particular optical lenses, sheets and films, comprising the copolyester carbonates according to claim 1. Machine-readable data carrier, characterized in that it is based on a substrate comprising the copolyester carbonate according to claim 1.