JPH02279721A - Aromatic polyester carbonate and its production - Google Patents

Abstract

PURPOSE:To obtain the subject carbonate having a low temperature of transition from a crystalline phase to a liquid crystal phase, a wide range of melt molding temperature, excellent mechanical properties and liquid crystal properties by constituting it from a plurality of specified structural units. CONSTITUTION:An aromatic polyester carbonate constituted from structural units of formulas I to IV [wherein R is an alkyl, a phenyl or a halogen atom; (n) is 0 to 4; and X is a (substituted) phenyl, a 3 to 6C alkyl or a halogen atom] and satisfying the relationship of formula V (wherein (a) to (d) are the molar ratios of the structural units).

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a novel aromatic polyester carbonate, more specifically, it is possible to easily produce molded products having good melt moldability and excellent physical properties, and also has liquid crystallinity. The present invention relates to an aromatic polyester carbonate having the following properties and a method for producing the same.

BACKGROUND OF THE INVENTION In recent years, there has been a demand for higher performance and lighter weight organic polymer materials due to advances in technology in various industrial fields and a trend toward energy conservation due to concerns about the supply of energy resources.

There is also a need for high performance materials that can be used as metal substitutes. In response to the demand for higher performance in these plastics, optically anisotropic liquid crystal polymers, which are characterized by parallel alignment of molecular chains, are attracting attention as polymers with excellent mechanical properties.

A typical example of this liquid crystal polymer is a fully aromatic polyester. For example, p-hydroxybenzoic acid homopolymer and its copolymer "rEKONOL" have a melting point that is too high and cannot be melt-molded.
Melt molding was difficult.

DE 2704315 also discloses thermotropic wholly aromatic polyester carbonates based on p-hydroxybenzoic acid, carbonic acid, hydroquinone, and optionally aromatic dicarboxylic acids. The flow temperature of these polyester carbonates was at least 265°C, and their melt viscosity was too high to be easily melt-molded.

Furthermore, JP-A-80-38427 discloses P-hydroxybenzoic acid, carbonic acid, diphenol, 4,4-dihydroxydiphenyl as diphenol, and optionally a thermotropic compound used for aromatic dicarboxylic acid. A wholly aromatic polyester carbonate is disclosed. In the examples of the above-mentioned published patent publication, only aromatic polyester carbonate using hydroquinone as the diphenol component is disclosed, but the temperature range at which the molding process of the obtained aromatic polyester carbonate is possible is 260°C. ℃ or higher, and the moldability was not satisfactory. In addition, in the above-mentioned published patent publication, a large number of diphenols are exemplified as diphenol components, but they are represented by the following general formula (wherein, X is a substituted or unsubstituted phenyl group,
Regarding monomers represented by (representing an alkyl group having 3 to 6 carbon atoms or a halogen), no examples or examples are disclosed, and of course, the effects of using these seven monomers have not been clarified. There wasn't.

Problems to be Solved by the Invention The present invention solves the above-mentioned problems of the prior art, can easily provide molded products having a wide range of melt molding processing and excellent physical properties, and is capable of producing aromatic polymers having liquid crystallinity. The purpose of the present invention is to provide nystyl carbonate and a method for producing the same.

Means for solving the problem, that is, the present invention provides the following formulas (A), (B), (C) and (r3)
It is composed of the structural units represented by formula (A), CB
), when the molar fractions of the structural units represented by (C) and (D) are a, b, c, and d, respectively.

It is an aromatic polyester carbonate characterized by satisfying the following relationship and having liquid crystallinity.

(However, in the formula, R represents an alkyl group, a phenyl group, or a halogen, which may be the same or different, and n represents an integer of O to 4.) Formula (0) iC+ (However, in the formula X represents a substituted or unsubstituted phenyl group, an alkyl group having 3 or more and 6 or less carbon atoms, or a halogen. , diphenols (r) represented by formula (2), diphenols (II) represented by formula (3)
) and diphenyl carbonate etc. in the presence of a catalyst under reduced pressure at a temperature of 160°C or more and less than 260°C, then 10 m
This is a method for producing an aromatic polyester carbonate, which is characterized in that polymerization is carried out at a temperature of 280° C. or more and 400° C. or less under reduced pressure of mHg or less.

(In the formula, Ro represents hydrogen, an alkyl group, a phenyl group, or an alkyl-substituted phenyl group.) (In the formula, R1 represents hydrogen, an alkyl group, a phenyl group, or an alkyl-substituted phenyl group.) Derived from carboxylic acids or aromatic hydroxycarboxylic acid esters.

In addition, the unit of formula (B) is (However, in the formula, R represents an alkyl group, a phenyl group, or a halogen, which may be the same or different, and n represents an integer of 0 to 4.) (However, in the formula, X represents a substituted or unsubstituted phenyl group, an alkyl group having 3 or more and 6 or less carbon atoms, or /\logen.) The present invention will be described in detail below.

The unit of formula (A) constituting the wholly aromatic polyester carbonate obtained by the present invention is (wherein R represents an alkyl group, a phenyl group, or a halogen which may be different, and n
represents an integer from 0 to 4) It is derived from the diphenols (1) shown below.

Furthermore, the units of formula (D) are each represented by × (wherein, X is a substituted or unsubstituted phenyl group,
It is derived from diphenols (11) represented by (representing an alkyl group having 3 to 6 carbon atoms or a halogen).

The unit of formula (C) can also be derived from diphenyl carbonate. Here, the amount of diphenyl carbonate used needs to be approximately equimolar or more relative to the total of the diphenols represented by formulas (B) and (D). Diphenyl carbonate is preferably used in an amount of 0.95 to 3.0 times the mole of the total of the diphenols represented by formulas (B) and (D). This is because if it is less than 0.95 times the mole, the molecular weight of the aromatic polyester carbonate will not increase, and if it exceeds 3.0 times the mole, the reaction will take a long time.

In the polyester carbonate of the present invention, the formula (A
), formula (B), formula (C), and formula (D), respectively, when the mole fractions of units represented by a, b, c, and d are satisfied, it is important to satisfy the following relationship.

In other words, the unit represented by the formula CD) is the unit represented by the formula (A) and the formula (
By being added to the unit shown in B), the transition temperature of polyester carbonate to the liquid crystal phase is lowered, and the temperature range in which it can be molded is expanded, which is a property useful in industrial implementation. . However, if the content ratio of formula CD) becomes too high, the mechanical properties of polyester carbonate will be insufficient, and if it is too low, the effect of expanding the temperature range in which molding can be performed will be insufficient.
It is more preferable to take the range shown in the following formula.

Furthermore, it is desirable that the relationship between the mole fractions of other units also satisfy the following relationship.

This means that the content ratio of the unit represented by formula (A) is 0.05
If it is less than this, the melting point of the polyester carbonate will be high, making melt molding difficult, and the mechanical properties of the molded product will be insufficient.

On the other hand, if the content ratio exceeds 0.80, the melting point of the polyester carbonate will become too high, making melt molding difficult.

Moreover, it is more preferable that the content ratio is within the range shown by the following formula.

As mentioned above, the aromatic polyester carbonate of the present invention has the formulas (A), (B), (C), and (D).
Although it consists essentially of the units shown in the following, it is also possible to contain units other than those mentioned above within a range that does not impair the desired physical properties. Examples of such units include isophthalic acid units, terephthalic acid units, 1,2-ethylene-bis(p-carboxyphenoxy) units, l,4-naphthalene dicarboxylic acid units, and 1,5-naphthalene dicarboxylic acid units. , 4,4°-diphenyldicarboxylic acid unit,
3,3°-diphenyldicarboxylic acid unit, 1,3-naphthalenedicarboxylic acid unit, 1.6-naphthalenedicarboxylic acid unit, 2.7-naphthalenedicarboxylic acid unit, 3,
Examples include a 4°-diphenyldicarboxylic acid unit, a 1,4-cyclohexanedicarboxylic acid unit, a B-hydroxy-2-naphthoic acid unit, and a m-hydroxybenzoic acid unit.

These units can be contained in an amount of 5 mol% or less, preferably 3 mol% or less of the total structural units.

The inherent viscosity [ηinh] at 50°C of a solution of the aromatic polyester carbonate of the present invention using p-chlorophenol as a solvent and having a concentration of 0.5 g/dt is 1.0.
It is preferable that it is dQ/g or more. Furthermore, when the aromatic polyester carbonate according to the present invention is partially soluble or insoluble in p-chlorophenol,
It may be considered to have the minimum viscosity mentioned above.

Here, the inherent viscosity is 1. Odt/g or more is preferable when the inherent viscosity is 1. Oa1g
If it is less than that, there will be a drawback that the mechanical properties of the molded product will be poor.

Furthermore, after the aromatic polyester carbonate of the present invention undergoes solid phase polymerization through so-called heat treatment, it may have a significantly large reduced viscosity or become insoluble in the solvent; Also included in the scope of the aromatic polyester carbonate of the present invention.

The aromatic polyester carbonate of the present invention can be produced according to a conventional polyester polycondensation method, and although there are no particular restrictions on the production method, a preferred production method will be described below.

In other words, the pressure is 160°C under reduced pressure below atmospheric pressure.
above, temperature below 280°C, preferably above 180°C5
After reacting at a temperature below 260°C, an additional 10 mmH
Pressure below g, temperature above 2130°C and below 400°C,
Preferably, it is necessary to carry out the reaction at a temperature of 280°C or higher and 360°C or lower.

The reason for this is that, first of all, under reduced pressure below atmospheric pressure,
The reaction is carried out at a temperature of 160°C or higher and lower than 280°C.
If the reaction is carried out at high temperature and high vacuum from the beginning, the monomer will be distilled out of the reaction system, resulting in a decrease in yield, which is undesirable. The reason for completing the polymerization at the temperature is to efficiently distill off reaction by-products from the system and obtain a high molecular weight polyester carbonate. In other words, 10℃ theory) 1
It is not preferable to complete the polymerization at a pressure exceeding 1.5 g or at a temperature below 280°C, since a high molecular weight polymer cannot be obtained, and at a temperature exceeding 400°C, deterioration of the polymer occurs.

As a typical embodiment, for example, primary (1) to (3)
) law.

(1) A method for producing diphenols I represented by formulas (2) and (3) by dephenol polycondensation from (I) and (■), diphenyl carbonate, and P-hydroxybenzoic acid phenyl ester.

(2) After reacting p-hydroxybenzoic acid with a desired amount of diphenyl carbonate to form a phenyl ester, formula (2)
and a method of producing by adding diphenols (1) and (11) represented by formula (3) and performing a phenol-depleting polycondensation reaction.

(3) p-hydroxybenzoic acid and diphenyl carbonate with the formula (
2) and diphenols (1) and (II) represented by formula (3) by dephenol polycondensation.

The reaction is preferably carried out in the presence of a catalyst. Suitable examples of such catalysts include magnesium acetate, manganese acetate,
Sodium acetate, potassium acetate, zinc acetate, titanium tetrabutylade, titanium tetraphenolate, sodium phenolate, zirconium butylade, zirconium propylade, titanium tetraphenolate, germanium dioxide, antimony trioxide, dibutyltin diacetate, dibutyldimethoxytin , and n-butylstanoic acid. The amount of catalyst is preferably from 0.0001 to 1% by weight, more preferably from 0.001 to 0.2% by weight, based on the total weight of monomers used.

In addition, the obtained product is preferably heated at 180 ml under reduced pressure.
Rough solid state polymerization can be carried out at temperatures of ~300°C. After 2-4 B hours, the molecular weight increases and the properties of the resulting aromatic polyester carbonate are further improved.

The polyester carbonate of the present invention exhibits a liquid crystal state when melted; the liquid crystal state herein refers to the liquid crystal state.

It can be observed using a polarizing microscope. That is,
Polyester carbonate was classified as a thermotropic liquid crystal if it exhibited the property of allowing light to pass through the entire range or part of it in an optical system using a pair of polarizers crossed at 30°C in the molten state. In addition, the transition temperature from the crystal phase to the liquid crystal phase can be determined by differential scanning calorimetry (DSC).
The measurement was carried out at a temperature increase rate of 10° C./sin.

The thermal decomposition onset temperature (Td) was measured by thermogravimetric analysis (TG) in a dry nitrogen stream at a temperature increase rate of 10° C./win. The temperature corresponding to the intersection of the tangent drawn at the bending point of the decomposition step on the thermogravimetric curve and the zero horizontal line of the thermogravimetric curve was defined as the thermal decomposition start temperature (Td).

The aromatic polyester carbonate of the present invention thus obtained has a transition temperature from a crystalline phase to a liquid crystalline phase of 400°C.
℃ or less, has optical anisotropy and particularly excellent mechanical properties in the uniaxial direction, and can be used in ordinary melt molding such as extrusion molding, injection molding, compression molding, and blow molding.
It can be processed into fibers, films, molded products, containers, hoses, etc.

In addition, during molding, reinforcing agents such as glass fiber, carbon fiber, and asbestos, fillers, nucleating agents, flame retardants, pigments, antioxidants, stabilizers, plasticizers, lubricants, and release agents are added to the aromatic polyester carbonate of the present invention. Additives such as molding agents and other thermoplastic resins can be added to impart desired properties to the molded article.

The aromatic polyester carbonate of the present invention has excellent melt moldability and extremely excellent mechanical properties due to the parallel molecular alignment resulting from its liquid crystallinity.

The present invention will be explained in more detail with reference to Examples below.

Examples Example 1 Phenyl p-hydroxybenzoate 18.21 g (0,0
85 mol), 4,4°-dihydroxydiphenyl 10
．． 55 g (0,057 mol), phenylhydroquinone 2J4 g (0,014 mol), diphenyl carbonate 18.
8.3 g (0,078 mol) and 0.005 g (2,2X 10-5 mol) of n-butylstanoic acid as a catalyst were charged into a polymerization reactor equipped with a stirrer and a vacuum distillation device, and the pressure was set at 850 mmHg. The mixture was heated to 200° C. in a nitrogen stream. The reaction temperature was gradually raised to 300° C. over 9 hours and 30 minutes, and phenol was further distilled off. Then, gradually reduce the pressure to 0.8 Hg, and
The reaction was carried out for 5 minutes. After the reaction was completed, a dark brown polyester carbonate was obtained. The yield was 24.13 g, and the yield was 95 wt%. The inherent viscosity [ηinh] was 1.60. Further, as measured by DSC, the transition temperature from the crystal phase to the liquid crystal phase was 203°C. Then, an optically anisotropic phase was observed at 200° C. or higher using a polarizing microscope. Thermogravimetric analysis showed that the thermal decomposition onset temperature (Td) was 470°C.

The obtained polyester carbonate was dried under reduced pressure at 120° C. for 8 hours, and then spun at a spinning temperature of 220° C. using a melt spinning device equipped with a spinning hole of 0.4 μl in diameter. The obtained polyester carbonate fiber has a tensile strength of 28.8 kg/mm2. Tensile modulus 2580kg
/ mm2. It had an extremely high strength and high modulus of elongation of 2.0%.

Example 2 Phenyl p-hydroxybenzoate 18.21 g (0,0
85 mol), 4,4'-dihydroxydiphenyl 1
0-55 g (0,057 mol), tert-butylhydroquinone 2.3 [1 g (0,014 mol), diphenyl carbonate 1B, E18 g (0,078 mol) and as a catalyst, n-butylstamenic acid 0.005 g (2,
2X 10-5 mol) was polymerized in the same manner as in Example 1.

After the reaction was completed, a dark brown polyester carbonate was obtained. The yield was 24.31 g, and the yield was 97 wt%. The inherent viscosity [ηinh] was 1.51. Further, as measured by DSC, the transition temperature from the crystal phase to the liquid crystal phase was 203°C. Then, an optically anisotropic phase was observed at 200° C. or higher using a polarizing microscope. According to thermogravimetric analysis, the thermal decomposition onset temperature (Td) was 462°C.

The obtained polyester carbonate was dried under reduced pressure at 120° C. for 8 hours, and then spun at a spinning temperature of 210° C. using a melt spinning device equipped with a spinning hole having a diameter of 0.4 mm. The obtained polyester carbonate fiber has a tensile strength of 25.5 kg/m2 and a tensile modulus of 2240 kg.
/am2. It had an elongation of 1.7z and extremely high strength and high modulus.

Example 3 Phenyl p-hydroxybenzoate 18.21 g (0,0
85 mol), 4,4'-dihydroxydiphenyl 1
0.55 g (0,057 mol), chlorohydroquinone 2.05 g (0,014 mol), diphenyl carbonate 18
．． 89 g (0,078 mol) and as catalyst 0.005 g (2,2X 10=mol) n-butylstamenic acid
Polymerization was carried out in the same manner as in Example 1.

After the reaction was completed, a dark brown polyester carbonate was obtained. The yield was 22.73 g, and the yield was 92 wt%. The inherent viscosity [ηinh] was 1.87. Further, as measured by DSC, the transition temperature from the crystal phase to the liquid crystal phase was 203°C. Then, an optically anisotropic phase was observed at 200° C. or higher using a polarizing microscope. According to thermogravimetric analysis, the thermal decomposition onset temperature (Td) was 472°C.

The obtained polyester carbonate was dried under reduced pressure at 120° C. for 8 hours, and then spun at a spinning temperature of 230° C. using a melt spinning device equipped with a spinning hole of 0.4 m diameter. The obtained polyester carbonate fiber has a tensile strength of 27.3 kg/am2. Tensile modulus 2780kg/
m2 and elongation of 1.9%, it had extremely high strength and high modulus.

Example 4 Phenyl p-hydroxybenzoate 18.21 g (0,0
85 mol), 4,4'-dihydroxydiphenyl 1
0.55 g (0.057 mol), phenylhydroquinone IQ, 43 g (0.05 g mol), diphenyl carbonate 28.83 g (0.124 mol) and as catalyst 0.005 g (2, 2X 10
-5 mol) was polymerized in the same manner as in Example 1.

After the reaction was completed, a light brown polyester carbonate was obtained. The yield was 33.50 g, and the yield was 98 wt%. The inherent viscosity [ηinh] was 2.48. Furthermore, it exhibited an optically anisotropic phase at a temperature of 180° C. or higher under observation with a polarizing microscope. Further, thermogravimetric analysis revealed that the thermal decomposition onset temperature (Td) was 471°C.

After drying the obtained polyester carbonate at 120°C for 8 hours under reduced pressure,
Using an injection molding machine, the injection temperature was 190℃ and the mold temperature was 80℃.
When injection molding was performed at ℃, a tough molded product was obtained.

Example 5 18.21 g of phenyl p-hydroxybenzoate (0,0
85 mol), 4,4-dihydroxydiphenyl 10
．． 55 g (0,057 mol), phenylhydroquinone 1.30 g (0,007 mol), diphenyl carbonate! 5
．． 08 g (0,071 mol) and as catalyst, n
-butylstanonic acid 0.005g (2,2X 10-'
mol) was polymerized in the same manner as in Example 1.

After the reaction was completed, a light brown polyester carbonate was obtained. The yield was 23.08 g, and the yield was 97 wt%. The inherent viscosity [ηinh] was 2.82. Further, as measured by DSC, the transition temperature from the crystal phase to the liquid crystal phase was 218°C. Further, it exhibited an optically anisotropic phase at a temperature of 215° C. or higher under observation with a polarizing microscope.

Furthermore, thermogravimetric analysis revealed that the thermal decomposition onset temperature (Td) was 475°C.

After drying the obtained polyester carbonate at 120°C for 8 hours under reduced pressure,
w Using an injection molding machine, the injection temperature was 230°C and the mold temperature was 8°C.
When injection molding was performed at 0°C, a tough molded product was obtained.

Example 6 Phenyl p-hydroxybenzoate 21.42 g (0,1
0 mol), 4,4'-dihydroxydiphenyl 27
．． 93 g (0.15 mol), phenylhydroquinone4. Hg (0,025 mol), diphenyl carbonate 41.2
4 g (0,193 mol) and 0.005 g (2,2X 10-' mol) of n-butylstanoic acid as catalyst
Polymerization was carried out in the same manner as in Example 1.

After the reaction was completed, a light brown polyester carbonate was obtained. The yield was 47.18 g, and the yield was 98 wt%. The inherent viscosity [ηinh] was 3.01. Further, as measured by DSC, the transition temperature from the crystal phase to the liquid crystal phase was 254°C. Further, it exhibited an optically anisotropic phase at a temperature of 250° C. or higher under observation with a polarizing microscope.

Further, thermogravimetric analysis revealed that the thermal decomposition onset temperature (Td) was 471°C.

After drying the obtained polyester carbonate at 120°C for 8 hours under reduced pressure,
Using an injection molding machine, the injection temperature was 255℃ and the mold temperature was 80℃.
When injection molding was performed at ℃, a tough molded product was obtained.

Example 7 p-E phenyl droxybenzoate 21.42 g (0,1
0 mol), 4.4'-dihydroxydiphenyl8.
01g (0,043mol), phenylhydroquinone 2
．． 84 g (0,014 mol), diphenyl carbonate 13.
Polymerization was carried out in the same manner as in Example 1 using 50 g (0,083 mol) and 0.005 g (2,2X 10-5 mol) of n-butylstanoic acid as a catalyst.

After the reaction was completed, a light brown polyester carbonate was obtained. The yield was 22.90 g, and the yield was 95 wt%. The inherent viscosity [ηinh] was 2.82, and the transition temperature from the crystal phase to the liquid crystal phase was 231'0 as measured by DSC. Further, it exhibited an optically anisotropic phase at a temperature of 230° C. or higher under observation with a polarizing microscope. Furthermore, thermal decomposition onset temperature (Td) was determined by thermogravimetric analysis.
was 488°C.

After drying the obtained polyester carbonate at 120°C for 8 hours under reduced pressure, it was dried under reduced pressure by C3I ■, Nint-Ma!
Using an injection molding machine, the injection temperature was 235℃ and the mold temperature was 80℃.
When injection molding was performed at ℃, a tough molded product was obtained.

Comparative Example 1 p-hydroxybenzoic acid, hydroquinone, 4°4- described in Example 6 of JP-A-80-38427
An aromatic polyester carbonate having the same composition as the aromatic polyester carbonate obtained from dihydroxydiphenyl and diphenyl carbonate was synthesized, and the temperature range for molding with the aromatic polyester carbonate according to the present invention was determined by measuring the liquid crystal phase temperature range by observation with a DSC5 polarized light microscope. A comparison was made.

Phenyl p-hydroxybenzoate 22.49g (0,1
05 mol), 4,4'-dihydroxydiphenyl 4
．． 19g (0,0225 mol), hydroquinone 2.48
g (0,0225 mol), Schiff carbonate x:) Iylo,
80 g (0,0495 mol), and as catalyst,
n-Butylstanone MO, 005g (2,2X10-5
mol) was polymerized in the same manner as in Example 1.

After the reaction was completed, a light brown polyester carbonate was obtained. The yield is IL88g, and the yield is! It was 38wt%. The inherent viscosity [ηinh] was 1.92. Further, as measured by DSC, the transition temperature from the crystal phase to the liquid crystal phase was 262°C. Under observation with a polarizing microscope, it exhibited an optically anisotropic phase at a temperature of 280"0 or higher.

From the above experimental results, it can be seen that the transition temperature of the aromatic polyester carbonate according to Comparative Example 1 to the liquid crystal phase is considerably higher than that of the example of the present invention.

In particular, the transition temperature to the liquid crystal phase of Comparative Example 1 is 80°C higher than that of Example 4. Therefore, compared to the aromatic polyester carbonate of the present invention, the aromatic polyester carbonate of Comparative Example can be molded. It can be seen that the temperature range is high and narrow, and the moldability is poor.

Effects of the Invention The aromatic polyester carbonate obtained by the present invention has a transition temperature from a crystalline phase to a liquid crystal phase as low as 400°C or less, and in particular, according to the present invention, it has a transition temperature of 180°C to 260°C, which cannot be obtained with the conventional technology. An aromatic polyester carbonate that can assume a liquid crystal phase in a low temperature range, which was not possible before, can be obtained.

Therefore, the aromatic polyester carbonate of the present invention has excellent moldability and can be molded over a wider temperature range.

Moreover, due to the parallel molecular alignment caused by its liquid crystallinity,
It has extremely excellent mechanical properties. Therefore, by subjecting the aromatic polyester carbonate obtained by the present invention to conventional melt molding such as extrusion molding, injection molding, and blow molding, useful molded products such as high-performance fibers, films, molded products, containers, and hoses can be obtained. can be obtained.

Claims (1)

[Scope of Claims] (1) Consisting of structural units represented by the following formulas (A), (B), (C) and (D),
) and (D) are respectively a, b, c, and d, it satisfies the relationship 0<d/(a+b)≦0.50 and has liquid crystallinity. Characteristic aromatic polyester carbonate. Formula (A) ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (B) ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (However, in the formula, R is an alkyl group, a phenyl group, which may be the same or different, or halogen, and n is an integer from 0 to 4.) Formula (C) ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (D) ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (However, in the formula, X is (represents a substituted or unsubstituted phenyl group, an alkyl group having 3 to 6 carbon atoms, or a halogen) (2) X in formula (D) is -C_6H_5, -C(CH
The aromatic polyester carbonate according to claim (1), which is _3)_3 or -Cl. (3) The aromatic polyester carbonate according to claim (1) or (2), wherein the ratio d/(a+b) is 0.05 or more and 0.40 or less. (4) The aromatic polyester carbonate according to any one of claims (1) to (3), wherein the ratio a/(a+b) is 0.05 or more and 0.80 or less. (5) The aromatic polyester carbonate according to any one of claims (1) to (3), wherein the ratio a/(a+b) is 0.40 or more and 0.70 or less. (6) 0.5g/d using p-chlorophenol as a solvent
Inherent viscosity [ηi
nh] is 1.0 dl/g or more. Claims (1) to (5)
) Aromatic polyester carbonate according to any one of the above. (7) Hydroxybenzoic acid or hydroxybenzoic acid ester represented by the following formula (1), diphenols (I) represented by formula (2), diphenols (II) represented by formula (3), and carbonic acid diphenyl in the presence of a catalyst under reduced pressure at a temperature of 160°C or more and less than 260°C, then 1
The method for producing aromatic polyester carbonate according to claim 1, characterized in that the polymerization is carried out at a temperature of 260° C. or more and 400° C. or less under reduced pressure of 0 mmHg or less. Formula (1) ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (In the formula, R_1 represents hydrogen, an alkyl group, a phenyl group, or an alkyl-substituted phenyl group.) (2) ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ ( However, in the formula, R represents an alkyl group, a phenyl group, or a halogen, which may be the same or different, and n represents an integer of 0 to 4.) Formula (3) ▲ Numerical formula, chemical formula, table, etc. Yes▼ (However, in the formula, X is a substituted or unsubstituted phenyl group,
(represents an alkyl group having 3 to 6 carbon atoms or a halogen)