JPH06239988A - Aromatic polycarbonate - Google Patents

Abstract

PURPOSE:To obtain the aromatic polycarbonate having a specific terminal group, excellent in melt flowability, hydrolysis stability, transparency, thermal resistance, mechanical strength and dimensional stability, and useful for automotive parts, etc. CONSTITUTION:This aromatic polycarbonate is characterized in that at least one of the terminal groups is a group of formula I (R1 is linear alkyl; A is 1,2-phenylene, 1,3-phenylene) such as 2-methoxycarbonyloxy group. The aromatic polycarbonate is obtained e.g. by reacting an aromatic dihydroxy compound such as bisphenol A with diphenyl carbonate in the presence of an endsealant of formula II [Y is COOH, OCOM, COOZ (M is metal ion; Z is halogen), etc.].

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to aromatic polycarbonates. More specifically, it relates to an aromatic polycarbonate having a group having a specific structure as an end group.

[0002]

2. Description of the Related Art Conventionally, aromatic polycarbonate has been known as an engineering plastic excellent in transparency, heat resistance, mechanical strength, dimensional stability and the like, and is widely used as parts for automobiles, electric and electronic materials and the like. ing. Usually, in order to produce an aromatic polycarbonate, a terminal blocking agent (also called a molecular weight regulator, a polymerization terminator, a chain terminator, an end terminator, etc.) is used for the purpose of controlling the molecular weight of the aromatic polycarbonate produced. Polymerization by addition (for example, US Pat. No. 3,028,365, US Pat. No. 3,085,992, US Pat. No. 3,173,891).
U.S. Pat. No. 3,275,601, U.S. Pat. No. 3,399.
172). Among them, phenol or p-tert-butylphenol is most commonly and widely used as the end capping agent. However, phenol or p-tert
Ordinary aromatic polycarbonate produced using -butylphenol as an end cap has a very high melt viscosity,
Since melt flowability is poor, melt molding has been carried out under high temperature conditions in order to secure sufficient flowability when producing molded articles. However, when manufacturing thin-walled molded products or molded products with complicated shapes, the fluidity during melting is still insufficient, it is easy to cause unfilling in the mold, and high precision dimensional stability is required. There is a problem that it is difficult to obtain a precision molded product.

Recently, aromatic polycarbonates having excellent melt flowability are used particularly in the fields requiring high dimensional stability required for optical equipment such as data storage disks or audio compact disks. Is needed. As a method of improving the melt fluidity, for example, C _m H _{2m + 1} O- group (m is an integer from 3 to 10) using a phenol derivative or a benzoic acid derivative having the para-position as a terminal blocking agent, fragrance A method for producing a group polycarbonate has been proposed (JP-A-63-2).
No. 58922). However, as an end-capping agent, for example, pn-hexyloxyphenol or pn-
Aromatic polycarbonates produced using octyloxybenzoic acid have improved melt flowability to some extent, but have drawbacks in weather stability (eg, hydrolysis stability). At present, there is a strong demand for aromatic polycarbonates having excellent melt flowability and weather resistance.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to overcome the above-mentioned drawbacks of the prior art and to provide an aromatic polycarbonate having excellent melt flowability and weather resistance (for example, hydrolysis stability). is there.

[0005]

The present inventors have arrived at the present invention as a result of extensive studies on aromatic polycarbonates. That is, the present invention is an aromatic polycarbonate in which at least one of the terminal groups is a group represented by the general formula (1). -OC (= O) -A-OR ₁ (1) (In the formula, R ₁ represents a chain alkyl group, and A represents a 1,2-phenylene group or a 1,3-phenylene group) In the terminal group represented by the general formula (1), R ₁ represents a chain alkyl group, preferably a chain alkyl group having 1 to 16 carbon atoms, and more preferably 1 to 1 carbon atoms.
2 represents a chain alkyl group.

Specific examples of R ₁ include, for example, methyl group, ethyl group, n-propyl group, isopropyl group and n-
Butyl group, isobutyl group, sec-butyl group, n-pentyl group, 1-methylbutyl group, 2-methylbutyl group, 3-
Methylbutyl group, neopentyl group, n-hexyl group, 1
-Methylpentyl group, 2-methylpentyl group, 3-methylpentyl group, 4-methylpentyl group, 4-methyl-2
-Pentyl group, 2-ethylbutyl group, n-heptyl group,
1-methylhexyl group, 2-methylhexyl group, 2,4
-Dimethylpentyl group, n-octyl group, 1-methylheptyl group, 5-methylheptyl group, 2-ethylhexyl group, 1,3-dimethylhexyl group, n-nonyl group, 1,
1-dimethylheptyl group, 2,6-dimethyl-4-heptyl group, 3,5,5-trimethylhexyl group, n-decyl group, 3,7-dimethyloctyl group, n-undecyl group, 1-methyldecyl group, n-dodecyl group, n-tridecyl group, n-tetradecyl group, n-pentadecyl group, n
A hexadecyl group may be mentioned.

In the terminal group represented by the general formula (1) according to the present invention, A is a 1,2-phenylene group or 1,3-phenylene group.
It represents a phenylene group, and these groups further have 1 to 1 carbon atoms.
It may be mono- or polysubstituted with a chain alkyl group having 8 carbon atoms, a chain alkoxy group having 1 to 8 carbon atoms, an aryl group having 6 to 10 carbon atoms, an aralkyl group having 7 to 10 carbon atoms, or a halogen atom. . At least one of the end groups of the invention is
Suitable endcapping agents used when producing an aromatic polycarbonate which is a group represented by the general formula (1) include:
The compound represented by general formula (1-A) can be mentioned. YA-OR ₁ (1-A) (In the formula, R ₁ and A are the same as above, and Y is -CO.
OH group, -COOM group or -COZ group is represented, M is a metal ion, and Z is a halogen atom.)

In the compound represented by the general formula (1-A) according to the present invention, Y represents a --COOH group, a --COOM group or a --COZ group, M represents a metal ion, and Z represents a halogen atom. Represent M is preferably a monovalent or divalent alkali metal ion or an alkaline earth metal ion, and specific examples thereof include lithium, sodium, potassium and calcium ions, and Z is preferably Examples thereof include a fluorine atom, a chlorine atom and a bromine atom, and a chlorine atom is more preferable.

The compound represented by the general formula (1-A) can be produced by a known method. That is, typically, in the general formula (1-A), the compound in which Y represents a —COOH group is, for example, a compound represented by the general formula (a) and a base (for example, sodium hydroxide, It can be produced by reacting the compound represented by the general formula (b) in the presence of potassium hydroxide and sodium hydride. YA-OH (a) (In the formula, A is the same as above, Y represents a -COOH group) Z-R < ₁ > (b) (In the formula, R < ₁ > is the same as above, and Z is In the general formula (1-A) in which Y is a —COZ group, a compound in which Z is a chlorine atom is a compound in which Y is a —COOH group. It can be produced by reacting with thionyl or oxalyl chloride. In the general formula (1-A), Y is −
The compound represented by the COOM group is produced by reacting a compound in which Y is a -COOH group with an alkali metal base such as sodium hydroxide, potassium hydroxide or calcium hydroxide or an alkaline earth base in an aqueous solution. be able to.

In the aromatic polycarbonate in which at least one of the terminal groups of the present invention is a group represented by the general formula (1), the group represented by the general formula (1) is typically shown below. Examples thereof include, but the present invention is not limited thereto. Exemplified number 1.2-Methoxyphenylcarbonyloxy group 2.2-Ethoxyphenylcarbonyloxy group 3.2-Ethoxy-5-tert-butylphenylcarbonyloxy group 4.2-n-propoxyphenylcarbonyloxy group 5.2- Isopropoxyphenylcarbonyloxy group 6.2-Isopropoxy-5- (α, α-dimethylbenzyl) phenylcarbonyloxy group 7.2-n-butoxy-4-ethoxyphenylcarbonyloxy group 8.2-Isobutoxyphenylcarbonyl Oxy group 9.2-n-pentyloxyphenylcarbonyloxy group 10.2- (2'-methylbutyloxy) -5-chlorophenylcarbonyloxy group 11.2- (3'-methylbutyloxy) phenylcarbonyloxy group 12 .2-Neopentyloxyphenyl Carbonyloxy group 13.2-n-hexyloxyphenylcarbonyloxy group 14.2-n-hexyloxy-5-phenylphenylcarbonyloxy group 15.2- (3'-methylpentyloxy) phenylcarbonyloxy group 16.2 -N-heptyloxyphenylcarbonyloxy group 17.2- (1'-methylhexyloxy) phenylcarbonyloxy group 18.2- (2'-methylhexyloxy) -6-methylphenylcarbonyloxy group

19.2-n-octyloxyphenylcarbonyloxy group 20.2- (2'-ethylhexyloxy) phenylcarbonyloxy group 21.2-n-decyloxyphenylcarbonyloxy group 22.2-n-decyloxy- 5-chlorophenylcarbonyloxy group 23.2-n-dodecyloxy-5-benzylphenylcarbonyloxy group 24.2-n-tetradecyloxyphenylcarbonyloxy group 25.2-n-hexadecyloxyphenylcarbonyloxy group 26. 3-methoxyphenylcarbonyloxy group 27.3-ethoxyphenylcarbonyloxy group 28.3-isopropoxyphenylcarbonyloxy group 29.3- (2'-methylbutyloxy) phenylcarbonyloxy group 30.3-n-hexyloxy group Phenylcarbonyloxy group 31.3- (2'-methylpentyloxy) phenylcarbonyloxy group 32.3-n-octyloxyphenylcarbonyloxy group 33.3- (3 ', 7'-dimethyloctyloxy) phenylcarbonyloxy Group 34.3-n-decyloxyphenylcarbonyloxy group 35.3-n-Pentadecyloxy-6-methylphenylcarbonyloxy group

The aromatic polycarbonate of the present invention can be produced from at least one aromatic dihydroxy compound, a carbonate precursor and at least one compound represented by the general formula (1-A), and a method for producing the same. For this, an interfacial polymerization method, a solution polymerization method, or a transesterification method known to those skilled in the art can be used. In particular, the interfacial polymerization method is a preferred production method. In producing the aromatic polycarbonate having a novel end group of the present invention,
The compound represented by the general formula (1-A) acts as a terminal blocking agent and serves to control or adjust the molecular weight of the aromatic polycarbonate in the process for producing the aromatic polycarbonate of the present invention. The end capping agent and the aromatic dihydroxy compound form an ester bond by the action of the carbonate precursor to produce an aromatic polycarbonate having an end group represented by the general formula (1) of the present invention.

The weight average molecular weight of the aromatic polycarbonate of the present invention can be any weight average molecular weight depending on the amount of the compound represented by the general formula (1-A) used in the production. Considering various physical properties such as moldability and impact resistance, the weight average molecular weight is preferably about 15,000 to about 150,000, more preferably about 2
It has a weight average molecular weight of 0000 to about 100,000. The weight average molecular weight generally depends on the amount of the compound represented by the general formula (1-A) used in producing the aromatic polycarbonate. Generally, the larger the amount of the compound represented by the general formula (1-A) used, the smaller the weight average molecular weight of the aromatic polycarbonate, and conversely, the amount of the compound represented by the general formula (1-A) used. When the amount is small, the weight average molecular weight of the aromatic polycarbonate becomes large. Generally, the amount of the compound represented by the general formula (1-A) used is about 1.2 to about 1 with respect to the amount of the aromatic dihydroxy compound used.
0.0 mol% is preferable, and about 1.5
More preferably, about 7.0 mol%.

The end-capping agent represented by the general formula (1-A) is generally used in the reaction of the aromatic dihydroxy compound with the carbonate precursor, that is, first, that is, prior to the addition of the carbonate precursor. It may be present together with the dihydroxy compound, or it may be sequentially and continuously supplied with the addition of the carbonate precursor. In the production of the polycarbonate of the present invention, the general formula (1-
The compound represented by A) can be used alone or in combination. When only one type is used, the end groups of the aromatic polycarbonate are all groups having the same structure. When a plurality of compounds are used in combination, the general formula (1
Various end groups are mixed depending on the number, amount and type of the compound represented by -A). Furthermore, the general formula (1-
The compound represented by A) can also be used in combination with other known end-capping agents within a range that does not impair the desired effects of the present invention. When the compound represented by the general formula (1-A) and another known end-capping agent are used together in the production of the aromatic polycarbonate of the present invention, the compound represented by the general formula (1 The ratio of the compound represented by -A) is 3
It is preferably 0 mol% or more, more preferably 50 mol% or more, and particularly preferably 60 mol% or more.

Examples of the end capping agent other than the compound represented by the general formula (1-A) include monovalent hydroxyaromatic compounds, monovalent hydroxyaromatic compound chloroformates and monovalent hydroxyaromatic compounds. Examples thereof include a compound having a carboxylic acid group and a monovalent carboxylic acid chloride compound. Examples of the monovalent hydroxyaromatic compound include phenol, p-cresol, o-ethylphenol, p-ethylphenol, p-isopropylphenol and p-tert.
-Butylphenol, p-cumylphenol, p-cyclohexylphenol, p-octylphenol, p-
Nonylphenol, 2,4-xylenol, p-methoxyphenol, p-hexyloxyphenol, p-decyloxyphenol, o-chlorophenol, m-chlorophenol, p-chlorophenol, p-bromophenol, pentabromophenol, penta Chlorophenol, p-phenylphenol, p-isopropenylphenol, 2,4-di (1-methyl-1-phenylethyl) phenol, β-naphthol, α-naphthol,
p- (2 ', 4', 4'-trimethylchromanyl) phenol, 2- (4'-methoxyphenyl) -2- (4 "
-Hydroxyphenyl) propane and other phenols. Examples of the monovalent hydroxyaromatic compound chloroformate compound include the above-mentioned monovalent hydroxyaromatic compound chloroformate derivatives.

Examples of the compound having a monovalent carboxylic acid group include acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, heptanoic acid, caprylic acid, 2,2-dimethylpropionic acid, 3-methylbutyric acid, 3 , 3-dimethylbutyric acid,
Fatty acids such as 4-methylvaleric acid, 3,3-dimethylvaleric acid, 4-methylcaproic acid, 2,4-dimethylvaleric acid, 3,5-dimethylcaproic acid and phenoxyacetic acid, benzoic acid, p-methylbenzoic acid Acid, p-tert-butylbenzoic acid,
p-propyloxybenzoic acid, p-butoxybenzoic acid,
p-hexyloxybenzoic acid, p-octyloxybenzoic acid, p-phenylbenzoic acid, p-benzylbenzoic acid,
Benzoic acids such as p-chlorobenzoic acid. Examples of the monovalent carboxylic acid chloride compound include chloride derivatives of the above-mentioned compounds having a monovalent carboxylic acid group.
In addition, the alkali metal (for example, the monovalent hydroxy aromatic compound or the compound having a monovalent carboxylic acid group) (for example,
Lithium, sodium, potassium) salts and alkaline earth metal (eg, calcium) salts can also be used as the endcapping agent.

Examples of the aromatic dihydroxy compound used in producing the aromatic polycarbonate of the present invention include compounds represented by the general formula (2). HO-R-OH (2) (In the formula, R is an aromatic hydrocarbon group or a substituted aromatic having a substituent such as an alkyl group, a cycloalkyl group, an alkenyl group, an aryl group, a halogen atom, a nitro group or an alkoxy group. each (3) (wherein, Ar ¹ and Ar ² - in group is a hydrocarbon group) in the above general formula (2), the group R is preferably of the general formula (3) -Ar ¹ -B-Ar ² It is a monocyclic divalent aromatic group,
B is a group that connects Ar ¹ and Ar ² ).

In the above general formula (3), Ar ¹ and A
r ² is each a monocyclic divalent aromatic group, preferably a phenylene group or a substituted phenylene group having a substituent, and the substituent is, for example, an alkyl group, a cycloalkyl group, an alkenyl group or an aryl group. Hydrocarbon groups such as groups, halogen atoms, nitro groups, alkoxy groups and the like can be mentioned. Both Ar ¹ and Ar ² are p-phenylene groups, m-phenylene groups or o-phenylene groups, or one of them is p-
A phenylene group, one of which is an m-phenylene group or o
It is preferably a -phenylene group, and particularly preferably both Ar ¹ and Ar ² are p-phenylene groups. B is A
A group for connecting r ¹ and Ar ² , which is a single bond or a divalent hydrocarbon group, and further —O—, —S—, —SO—, —SO.
It may be a group containing atoms other than carbon and hydrogen, such as _2- and -CO-. Examples of the divalent hydrocarbon group include a saturated hydrocarbon group, for example, an alkylidene group such as methylene, ethylene, 2,2-propylidene, cyclohexylidene and the like, but a group substituted with an aryl group is also included. ,Also,
It may be a hydrocarbon group containing an aromatic group or other unsaturated hydrocarbon group.

Specific examples of the aromatic dihydroxy compound include bis (4-hydroxyphenyl) methane and bis (2
-Methyl-4-hydroxyphenyl) methane, bis (3
-Methyl-4-hydroxyphenyl) methane, 1,1-
Bis (4'-hydroxyphenyl) ethane, 1,2-bis (4'-hydroxyphenyl) ethane, bis (4-hydroxyphenyl) phenylmethane, bis (4-hydroxyphenyl) diphenylmethane, bis (4-hydroxyphenyl) -1-naphthylmethane, 1,1-bis (4'-hydroxyphenyl) -1-phenylethane,
2,2-bis (4'-hydroxyphenyl) propane ["bisphenol A"], 1,1-bis (4'-hydroxyphenyl) -3-methylpropane, 1,3-bis (4'-hydroxyphenyl) -1,1-dimethylpropane, 2- (4'-hydroxyphenyl) -2- (3 '
-Hydroxyphenyl) propane, 2,2-bis (4 '
-Hydroxyphenyl) butane, 1,1-bis (4'-
Hydroxyphenyl) -3-methylbutane, 2,2-bis (4'-hydroxyphenyl) pentane, 2,2-bis (4'-hydroxyphenyl) -4-methylpentane, 2,2-bis (4'-hydroxy) Phenyl) hexane, 4,4-bis (4'-hydroxyphenyl) heptane, 2,2-bis (4'-hydroxyphenyl) octane, 2,2-bis (4'-hydroxyphenyl) nonane,

Bis (3,5-dimethyl-4-hydroxyphenyl) methane, 2,2-bis (3'-methyl-4'-
Hydroxyphenyl) propane, 2,2-bis (3'-
Ethyl-4'-hydroxyphenyl) propane, 2,2
-Bis (3'-n-propyl-4'-hydroxyphenyl) propane, 2,2-bis (3'-isopropyl-4 '
-Hydroxyphenyl) propane, 2,2-bis (3 '
-Sec-butyl-4'-hydroxyphenyl) propane, 2,2-bis (3'-tert-butyl-4'-hydroxyphenyl) propane, 2,2-bis (3'-cyclohexyl-4'-hydroxyphenyl) ) Propane 2,
2-bis (3'-allyl-4'-hydroxyphenyl)
Propane, 2,2-bis (3'-methoxy-4'-hydroxyphenyl) propane, 2,2-bis (3 ', 5'
-Dimethyl-4'-hydroxyphenyl) propane,
2,2-bis (2 ', 3', 5 ', 6'-tetramethyl-4'-hydroxyphenyl) propane, 2,2-bis (3'-chloro-4'-hydroxyphenyl) propane, 2, 2-bis (3 ', 5'-dichloro-4'-hydroxyphenyl) propane, 2,2-bis (3'-bromo-4'-hydroxyphenyl) propane, 2,2-bis (3', 5 '-Dibromo-4'-hydroxyphenyl) propane, 2,2-bis (2 ', 6'-dibromo-
3 ', 5'dimethyl-4'-hydroxyphenyl) propane, bis (4-hydroxyphenyl) cyanomethane,
Bis (hydroxyaryl) alkanes such as 1-cyano-3,3-bis (4′-hydroxyphenyl) butane and 2,2-bis (4′-hydroxyphenyl) hexafluoropropane,

1,1-bis (4'-hydroxyphenyl) cyclopentane, 1,1-bis (4'-hydroxyphenyl) cyclohexane, 1,1-bis (3'-methyl-4'-hydroxyphenyl) cyclohexane , 1,
1-bis (3 ', 5'-dimethyl-4'-hydroxyphenyl) cyclohexane, 1,1-bis (3', 5'-
Dichloro-4′-hydroxyphenyl) cyclohexane, 1,1-bis (4′-hydroxyphenyl) -4-
Methylcyclohexane, 1,1-bis (4′-hydroxyphenyl) -3,3,5-trimethylcyclohexane, 1,1-bis (4′-hydroxyphenyl) cycloheptane, 1,1-bis (4′-hydroxy) Phenyl)
Cyclooctane, 1,1-bis (4'-hydroxyphenyl) cyclononane, 1,1-bis (4'-hydroxyphenyl) cyclododecane, 2,2-bis (4'-hydroxyphenyl) norbornane, 8,8- Screw (4'-
Hydroxyphenyl) tricyclo [5.2.1.
0 ^2.6 ] Bis (hydroxyaryl) cycloalkanes such as decane and 2,2-bis (4′-hydroxyphenyl) adamantane, 4,4′-dihydroxydiphenyl ether, 3,3′-dimethyl-4,4′-dihydroxy Bis (hydroxyaryl) ethers such as diphenyl ether and ethylene glycol bis (4-hydroxyphenyl) ether,

4,4'-dihydroxydiphenyl sulfide, 3,3'-dimethyl-4,4'-dihydroxydiphenyl sulfide, 3,3'-dicyclohexyl-
4,4'-dihydroxydiphenyl sulfide, 3,
3'-diphenyl-4,4'-dihydroxydiphenyl sulfide, 3,3 ', 5,5'-tetramethyl-4,
Bis (hydroxyaryl) sulfides such as 4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxydiphenyl sulfoxide, 3,3'-dimethyl-
Bis (hydroxyaryl) sulfoxides such as 4,4′-dihydroxydiphenyl sulfoxide, 4,4′-dihydroxydiphenyl sulfone, 3,3′-dimethyl-
4,4'-dihydroxydiphenyl sulfone, 3,3 '
-Bis (hydroxyaryl) sulfones such as diphenyl-4,4'-dihydroxydiphenylsulfone and 3,3'-dichloro-4,4'-dihydroxydiphenylsulfone, bis (4-hydroxyphenyl) ketone, bis (3- Bis (hydroxyaryl) ketones such as methyl-4-hydroxyphenyl) ketone,

Further, 6,6'-dihydroxy-2,
2 ', 3,3'-tetrahydro-3,3,3', 3'-
Tetramethyl-1,1'-spirobi (1H-indene)
["Spirobiindane bisphenol"], 7,7-dihydroxy-3,3 ', 4,4'-tetrahydro-4,
4,4 ', 4'-Tetramethyl-2,2'-spirobi (2H-1-benzopyran) ["spirobichroman"], trans-2,3-bis (4'-hydroxyphenyl) -2-butene , 9,9-bis (4'-hydroxyphenyl) fluorene, 3,3-bis (4'-hydroxyphenyl) -2-butanone, 1,6-bis (4'-
Hydroxyphenyl) -1,6-hexanedione, 1,
1-dichloro-2,2-bis (4'-hydroxyphenyl) ethylene, 1,1-dibromo-2,2-bis (4 '
-Hydroxyphenyl) ethylene, 1,1-dichloro-
2,2-bis (3′-phenoxy-4′-hydroxyphenyl) ethylene, α, α, α ′, α′-tetramethyl-α, α′-bis (4-hydroxyphenyl) -p-xylene, α , Α, α ', α'-tetramethyl-α, α'
-Bis (4-hydroxyphenyl) -m-xylene,

3,3-bis (4-hydroxyphenyl)
Phthalide, 2,6-dihydroxydibenzo-p-dioxin, 2,6-dihydroxythianthrene, 2,7-dihydroxyphenoxathiin, 2,7-dihydroxy-
9,10-dimethylphenazine, 3,6-dihydroxydibenzofuran, 3,6-dihydroxydibenzothiophene, 4,4′-dihydroxybiphenyl, 1,4-dihydroxynaphthalene, 1,5-dihydroxynaphthalene, 2,6-dihydroxynaphthalene , 2,7-dihydroxynaphthalene, 2,7-dihydroxypyrene and the like. In addition to the above aromatic dihydroxy compounds, hydroquinone, resorcin, etc. are also used. Furthermore, for example, bisphenols (aromatic dihydroxy compounds) containing an ester bond, which can be produced by reacting 2 mol of bisphenol A with 1 mol of isophthaloyl chloride or terephthaloyl chloride, are also useful. You may use these individually or in mixture of 2 or more types. A particularly preferred aromatic dihydroxy compound is bisphenol A.

Examples of the carbonate precursor include carbonyl halides, haloformate compounds, dialkyl carbonate compounds, diaryl carbonate compounds and alkylaryl carbonate compounds, and carbonyl halides and haloformate compounds are preferred. As the carbonyl halide,
Although carbonyl chloride called phosgene is used, it may be a carbonyl halide derived from a halogen other than chlorine, such as carbonyl bromide, carbonyl iodide, carbonyl fluoride, or a mixture thereof. Further, a compound having the ability to form a haloformate group, for example, trichloromethylchloroformate which is a dimer of phosgene, bis (trichloromethyl) carbonate which is a trimer of phosgene, etc. may be used. Preference is given to using phosgene. As the haloformate compound, a bis or monohaloformate compound or an oligomeric bis or monohaloformate compound is used, and a typical example thereof is a compound represented by the general formula (4).

X- (OR'-OC (= O)) n-OR'-OX (4) (In the formula, X represents a hydrogen atom or a halocarbonyl group,
At least one X is a halocarbonyl group, R ′ represents a divalent aliphatic group or aromatic group, and n represents 0 or a positive integer) The compound represented by the general formula (4) is A bishaloformate compound and an oligomeric bishaloformate compound derived from an aliphatic dihydroxy compound, and a bishaloformate compound and an oligomeric bishaloformate compound derived from an aromatic dihydroxy compound. In the general formula (4), examples of the divalent aliphatic group R ′ include an alkylene group having 2 to 20 carbon atoms and a cycloalkylene group having 4 to 12 carbon atoms, and examples thereof include linear or branched ethylene. Group, propylene group, butylene group, pentylene group, hexylene group, heptylene group, octylene group, nonylene group, decylene group,
A divalent hydrocarbon group such as an undecylene group or a dodecylene group,
Further, a cyclobutylene group, a cyclopentylene group, a cyclohexylene group, a cycloheptylene group, a cyclooctylene group, a cyclononylene group, a cyclodecylene group, a cycloundecylene group, a cyclododecylene group or a divalent cyclic hydrocarbon group thereof optionally substituted. Is.

Specific examples of these aliphatic dihydroxy compounds include ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,
6-hexanediol, 1,5-hexanediol,
1,7-Heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol, 1,12-dodecanediol, neopentyl glycol, 2-ethyl-
1,6-hexanediol, 2-methyl-1,3-propanediol, 1,3-cyclohexanediol, 1,
4-cyclohexanediol, 2,2-bis (4'-hydroxycyclohexyl) propane, etc. can be mentioned. The divalent aliphatic group R ′ also includes a group represented by the general formula (5). -R "-Ar ³ -R"-(5) (In the formula, R "represents an alkylene group having 1 to 6 carbon atoms, and
r ³ represents a divalent aromatic group having 6 to 12 carbons) In the general formula (5), the R ″ group represents an alkylene group having 1 to 6 carbons, for example, a linear or branched methylene group. Group, ethylene group, propylene group, butylene group, pentylene group,
Examples thereof include a divalent hydrocarbon group of a hexylene group, and the Ar ³ group represents a divalent aromatic group having 6 to 12 carbon atoms, and examples thereof include a phenylene group, a substituted phenylene group and a naphthylene group.

Specific examples of this type of aliphatic dihydroxy compound include xylylenediol and 1,4-bis (2 ').
-Hydroxyethyl) benzene, 1,4-bis (3'-
Hydroxypropyl) benzene, 1,4-bis (4'-
Examples thereof include hydroxybutyl) benzene, 1,4-bis (5′-hydroxypentyl) benzene, and 1,4-bis (6′-hydroxyhexyl) benzene.
In the general formula (4), examples of the aromatic dihydroxy compound in which the R ′ group is an aromatic group include the aromatic dihydroxy compounds described above, such as bisphenol A and hydroquinone. Further, the oligomeric bis or monohaloformate compound may have R ′ groups having different structures in the same molecule. These haloformate compounds may be used alone, in a mixture, or in a mixture with a carbonyl halide. Examples of the dialkyl carbonate compound, the diaryl carbonate compound, and the alkylaryl carbonate compound include dimethyl carbonate,
Examples thereof include diphenyl carbonate, a methylphenyl carbonate compound, diphenyl carbonate substituted with a halogen atom, a nitro group and the like, and a mixture thereof.

When the aromatic polycarbonate of the present invention is produced by the interfacial polymerization method, a carbonyl halide and / or a halogenate compound is preferably used as the carbonate precursor. The carbonate precursor may be used in any of a gas state, a liquid state and a solid state.However, when a carbonyl halide is used, it is used in a gas state or in a state of being dissolved in an organic solvent. It is preferably used as a solvent solution, and when a haloformate compound is used, it is preferably used as an organic solvent solution in a solid state or in a state of being dissolved in an organic solvent. When the aromatic polycarbonate of the present invention is produced by an interfacial polymerization method, a known method for producing an aromatic polycarbonate can be used. For example, in a two-phase mixed solvent of at least one aromatic dihydroxy compound and an alkali metal or alkaline earth metal base, water and an organic solvent which is substantially insoluble in water, a carbonyl halide or / and a halogenate compound are represented by the general formula A method for producing an aromatic polycarbonate by allowing it to act in the presence of a compound represented by (1-A), and more preferably a method for producing an aromatic polycarbonate in the presence of a polycarbonate-forming catalyst.

When the aromatic polycarbonate of the present invention is produced by the interfacial polymerization method, when a carbonyl halide compound, for example, is used as a carbonate precursor, the amount thereof is about 1 relative to the amount of the aromatic dihydroxy compound. It is preferred to use an amount of from 0.0 to about 1.3 times the molar amount. The use of a carbonyl halide compound in an amount extremely smaller than 1.0 times the molar amount results in generation of unreacted aromatic dihydroxy compound, which is a factor of producing an aromatic polycarbonate having a poor color tone. Further, the use of a carbonyl halide compound in an excessively larger amount than 1.3 times by mole results in the production of a large amount of oligomers whose terminals are terminated by haloformate end groups, and as a result, haloformate end groups of oligomers in the reaction system O
The proportion of H groups (or phenolate groups) is not preferable, since the haloformate end groups become excessive, and the normal polymerization time results in the formation of an aromatic polycarbonate having a small molecular weight that is terminated by haloformate end groups.

Any organic solvent may be used as long as it is substantially insoluble in water, inert to the reaction, and capable of dissolving the aromatic polycarbonate. For example, dichloromethane, chloroform, 1,2-
Aliphatic chlorinated compounds such as dichloroethane, 1,2-dichloroethylene, trichloroethane, tetrachloroethane, dichloropropane, etc., or chlorinated hydrocarbons such as chlorobenzene, aromatic chlorinated compounds such as dichlorobenzene, or a mixture thereof as a suitable organic solvent. Can be mentioned. Further, an organic solvent in which an aromatic hydrocarbon such as toluene, xylene, ethylbenzene, etc., an aliphatic hydrocarbon such as hexane, heptane, cyclohexane, etc. are mixed with these chlorinated hydrocarbons or a mixture thereof may be used. A particularly preferred organic solvent is dichloromethane.

The amount of the organic solvent used is usually preferably such that the concentration of the aromatic polycarbonate in the organic solvent solution containing the aromatic polycarbonate at the end of the polymerization is about 5 to about 35% by weight. . When the concentration of the aromatic polycarbonate is extremely low, a large amount of organic solvent is required, which is not preferable from the viewpoint of productivity. Further, when the concentration of the aromatic polycarbonate is close to the saturation concentration, the viscosity of the organic solvent solution of the aromatic polycarbonate becomes very high, so that the reaction efficiency of the interfacial polymerization is lowered and the handleability of the organic solvent solution after the polymerization is deteriorated. It is not preferable because of problems such as the above. It is particularly preferable to use the organic solvent so that the concentration of the aromatic polycarbonate in the organic solvent solution of the aromatic polycarbonate at the end of the polymerization is about 10 to about 20% by weight. The amount of organic solvent used also depends on the amount of water used. The reaction mixture may be in an amount necessary to maintain a substantially uniform emulsified state, and the volume ratio of the organic phase relative to the water is preferably about 0.4 to about 1.5: 1. When the organic solvent is less than the above range, the hydrolysis of the carbonate precursor and the haloformate group is increased, and a large amount of stirring power is required to form a uniform emulsified state, and the organic solvent is more than the above range. Even when the amount is large, a larger stirring power is required, which is not preferable from the viewpoint of productivity.

The alkali metal or alkaline earth metal base (hereinafter abbreviated as a base) used in producing the aromatic polycarbonate of the present invention is usually an alkali such as sodium hydroxide, potassium hydroxide or calcium hydroxide. Among the hydroxides of metals or alkaline earth metals, sodium hydroxide and potassium hydroxide are preferable, and sodium hydroxide is particularly preferable, from the viewpoint of being relatively easily available. The base is usually used in the form of an aqueous solution, and it is preferable to dissolve the aromatic dihydroxy compound in this aqueous solution and use it in the reaction. In this case, since the basic aqueous solution of the aromatic dihydroxy compound is generally easily colored, the reducing agent such as sodium sulfite, sodium hydrosulfite or sodium borohydride is added as an antioxidant to make the basic aromatic dihydroxy compound basic. An aqueous solution may be prepared.

Suitable polycarbonate-forming catalysts (also called polymerization catalysts or polycondensation catalysts) used in the interfacial polymerization method are tertiary amines, quaternary ammonium salts, tertiary phosphines, quaternary phosphonium salts or nitrogen-containing heterocyclic compounds. Examples thereof include salts thereof, imino ethers and salts thereof, and compounds having an amide group. It is preferably a trialkylamine which is a tertiary amine, more preferably a trialkylamine having an alkyl group of C _{1 to} C ₄ having no branch on the carbon atoms at the 1-position and 2-position, and for example, ,
Examples thereof include triethylamine, tri-n-propylamine, diethyl-n-propylamine, and tri-n-butylamine, and triethylamine is particularly preferable in terms of easy availability and excellent catalytic effect. The amount of the polycarbonate-forming catalyst used is preferably about 0.0005 to about 1.5 mol% based on the number of moles of the aromatic dihydroxy compound. With an excessively less than 0.0005 mol% catalyst amount,
The catalyst effect for forming an aromatic polycarbonate is not sufficient and a very long polymerization time is required, which is not economical and is not preferable. Also, the catalyst amount is 1.5 mol%
Even if the amount is excessively large, there is no effect of particularly accelerating the polymerization reaction, and the excess polycarbonate-forming catalyst is wasted, which is not preferable. The polycarbonate generation catalyst can be added before or during the reaction when producing the aromatic polycarbonate of the present invention.

In the interfacial polymerization method, the reaction temperature is about 1.
It is preferable to produce the aromatic polycarbonate of the present invention at 0 ° C to the boiling temperature of the organic solvent used for the reaction. 10
At a reaction temperature extremely lower than ℃, the reaction rate becomes slow,
The reaction efficiency becomes poor. Further, it becomes impractical such as requiring a cooling medium or a cooling device. When the organic solvent used is dichloromethane, it can be carried out at a reflux temperature of about 39 ° C. at atmospheric pressure. In practice, the reaction is usually initiated near room temperature and then raised to near reflux temperature by the heat of reaction. The reaction is usually carried out at atmospheric pressure, but if desired, the reaction may be carried out under pressure or under reduced pressure.

The aromatic polycarbonate of the present invention is
If desired, a branched aromatic polycarbonate can be obtained by adding a branching agent. Suitable branching agents for the aromatic polycarbonates of the present invention include, for example, compounds having three or more aromatic hydroxy groups, chloroformates, carboxylic acid groups, carboxylic acid chloride groups and also active halogen atoms. The specific examples include phloroglucinol, 1,
1,4,4-tetrakis (4'-hydroxyphenyl)
Cyclohexane, 1,3,5-tris (4′-hydroxyphenyl) benzene, 1,1,1-tris (4′-hydroxyphenyl) ethane, 1,1,2-tris (4 ′)
-Hydroxyphenyl) propane, α, α, α ', α'
-Tetrakis (4'-hydroxyphenyl) -1,4-
Diethylbenzene, 1-hydroxy-2,4-bis [α
-Methyl-α- (4'-hydroxyphenyl) ethyl]
Benzene, 2,2,5,5-tetrakis (4'-hydroxyphenyl) hexane, 1,1,2,3-tetrakis (4'-hydroxyphenyl) propane, 2- (4'-hydroxyphenyl) -2- (2 ", 4" -dihydroxyphenyl) propane, 4,6-dimethyl-2,4,6-
Tris (4'-hydroxyphenyl) -2-heptene,
4,6-Dimethyl-2,4,6-tris (4'-hydroxyphenyl) heptane, 1,4-bis (4 ', 4 "-
Dihydroxytriphenylmethyl) benzene, 3,
3 ', 5,5'-tetrahydroxydiphenyl ether, tris (4-hydroxyphenyl) phosphine, trimesic acid trichloride, cyanuric acid chloride,
3,3-bis (4'-hydroxyphenyl) -2-oxo-2,3-dihydroindole, 3,3-bis (4 '
-Hydroxy-3-methylphenyl) -2-oxo-
2,3-dihydroindole and the like can be mentioned.
When a branching agent is used, its amount can be changed according to the degree of branching of the target aromatic polycarbonate, but is usually 0.05 to 2.0 with respect to the aromatic dihydroxy compound. It is preferable to use about mol%.

Further, the aromatic polycarbonate of the present invention also includes an aromatic polyester carbonate, and comprises at least one aromatic dihydroxy compound [for example, a compound represented by the general formula (2)], a carbonate precursor. Body (eg phosgene), divalent carboxylic acid or derivative of said compound (eg US Pat. No. 3,169,91)
Aromatic polyester carbonates can be preferably produced using the compound represented by the general formula (1-A), such as isophthalic acid, terephthalic acid, isophthalic acid dichloride, and terephthalic acid dichloride described in No. 21).
At this time, the amount of the divalent carboxylic acid or the derivative of the compound used is 30 to 80 relative to the aromatic dihydroxy compound.
It is preferable to use about mol%.

In producing the aromatic polycarbonate of the present invention, a solution polymerization method already known to those skilled in the art can be used. For example, in a pyridine solution, an aromatic dihydroxy compound or a carbonate precursor can be prepared. A carbonyl halide or / and a haloformate compound and a compound represented by the general formula (1-A) by about 0 to 5
It can be produced by acting at 0 ° C. Using a dialkyl carbonate compound, an alkylaryl carbonate compound and / or a diaryl carbonate compound, an aromatic dihydroxy compound and a general formula (1
When the aromatic polycarbonate of the present invention is produced from the compound represented by -A), a dialkyl carbonate compound, an alkylaryl carbonate compound or /
And a diaryl carbonate compound, a mixture of an aromatic dihydroxy compound and a compound represented by the general formula (1-A), at a temperature of about 60 to about 300 ° C. under normal pressure, increased pressure or reduced pressure, if necessary. In the presence of a transesterification catalyst (eg, metal oxide, hydroxide, carbonate, etc.), it can be produced by a transesterification method already known to those skilled in the art.

When the aromatic polycarbonate of the present invention is produced by an interfacial polymerization method or a solution polymerization method, the organic solvent solution containing the aromatic polycarbonate is usually separated from the aqueous layer and then washed with water to substantially remove the electrolyte. After the organic solvent is removed by a known method, the aromatic polycarbonate of the present invention can be obtained. Further, the aromatic polycarbonate produced by the transesterification method may be obtained by directly pelletizing or processing the aromatic polycarbonate melted under the transesterification condition into a molded product. The aromatic polycarbonate of the present invention is soluble in a specific organic solvent (for example, a halogenated hydrocarbon solvent such as dichloromethane), and can be processed into a molded product such as a film from the organic solvent. The aromatic polycarbonate of the present invention is thermoplastic and can be easily molded from a melt by a known molding method such as injection molding, extrusion molding, blow molding, or lamination.

The aromatic polycarbonate of the present invention may be mixed with other aromatic polycarbonates or polyesters such as polyethylene terephthalate and poly (1,4-butylene terephthalate). Further, in the aromatic polycarbonate of the present invention, in order to impart thermal stability, light resistance, weather resistance, flame resistance, release property and other properties to the aromatic polycarbonate, A very wide range of additives, stabilizers, flame retardants and fillers in known manner during or after manufacture, namely processing and heat stabilizers, antioxidants, hydrolysis stabilizers, impact stabilizers, UV absorbers, Release agents, organic halogen compounds, alkali metal sulfonates, glass fibers, glass beads, barium sulfate, TiO _{2 and the} like may be added.

[0041]

EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited to the following examples. Example 1 Production of Aromatic Polycarbonate having an End Group of Exemplification No. 3 A 10 l baffled flask was equipped with a three-stage six-blade stirrer and a reflux condenser, and 912 g (4.0 mol) of bisphenol A was added to the flask. 2-ethoxy-5-te
30.2 g of rt-butylbenzoic acid (0.136 mol, 3.4 mol% based on bisphenol A), 4 l of dichloromethane and 4 l of deionized water were added to form a suspension, and oxygen was removed from the flask. A nitrogen purge was performed. Next, 2.2 l of an aqueous solution in which 1.2 g of sodium hydrosulfite and 432 g (10.8 mol) of caustic soda were dissolved was supplied to the above suspension, and bisphenol A was dissolved at 15 ° C. Phosgene (495 g, 5.0 mol) was fed to the solution at a rate of 8.25 g / min. The reaction temperature rose to 39 ° C., and reflux of dichloromethane was confirmed. After the supply of phosgene was completed, 0.64 g of triethylamine was added, and the reaction solution was stirred for another 90 minutes to carry out a polymerization reaction. Then, the reaction solution was allowed to stand still, the organic layer was separated, neutralized with hydrochloric acid, and washed with deionized water until the electrolyte was exhausted. To the dichloromethane solution of the aromatic polycarbonate thus obtained, 2 l of toluene and 5 l of water were added, and the mixture was heated to 98 ° C. to distill off dichloromethane and toluene to obtain a powder of aromatic polycarbonate. The obtained aromatic polycarbonate had a number average molecular weight of 20,900 and a weight average molecular weight of 5,1200.

Example 2 Production of Aromatic Polycarbonate having an Exemplified No. 11 In Example 1, instead of using 2-ethoxy-5-tert-butylbenzoic acid, 2- (3'-methylbutyloxy) was used. An aromatic polycarbonate was produced in the same manner as in Example 1 except that 30.8 g of benzoic acid chloride (3.4 mol% based on bisphenol A) was used. The number average molecular weight of the obtained aromatic polycarbonate is 2080.
0, the weight average molecular weight was 51,000.

Example 3 Preparation of Aromatic Polycarbonate having Ex. No. 13 End Group Instead of using 2-ethoxy-5-tert-butylbenzoic acid in Example 1, 2-n-hexyloxybenzoic acid 30. An aromatic polycarbonate was produced in the same manner as in Example 1 except that 2 g (3.4 mol% based on bisphenol A) was used. The obtained aromatic polycarbonate had a number average molecular weight of 21,100 and a weight average molecular weight of 51,300.

Example 4 Preparation of Aromatic Polycarbonate having Ex. No. 16 End Group Instead of using 2-ethoxy-5-tert-butylbenzoic acid in Example 1, 2-n-heptyloxybenzoic acid 32. An aromatic polycarbonate was produced in the same manner as in Example 1 except that 1 g (3.4 mol% based on bisphenol A) was used. The obtained aromatic polycarbonate had a number average molecular weight of 21,000 and a weight average molecular weight of 51300.

Example 5 Production of Aromatic Polycarbonate having Ex. No. 19 End Group Instead of using 2-ethoxy-5-tert-butylbenzoic acid in Example 1, 2-n-octyloxybenzoic acid chloride 36 An aromatic polycarbonate was produced in the same manner as in Example 1 except that 0.5 g (3.4 mol% based on bisphenol A) was used. The obtained aromatic polycarbonate had a number average molecular weight of 20,900 and a weight average molecular weight of 51,100.

Example 6 Preparation of Aromatic Polycarbonate having Ex. No. 22 End Group Instead of using 2-ethoxy-5-tert-butylbenzoic acid in Example 1, 2-decyloxy-5-chlorobenzoic acid chloride An aromatic polycarbonate was produced in the same manner as in Example 1 except that 42.4 g (3.2 mol% based on bisphenol A) was used. The obtained aromatic polycarbonate had a number average molecular weight of 21,800 and a weight average molecular weight of 52,600.

Example 7 Preparation of Aromatic Polycarbonate Having End Group No. 29 In Example 1, instead of using 2-ethoxy-5-tert-butylbenzoic acid, 3- (2'-methylbutyloxy) was used. An aromatic polycarbonate was produced in the same manner as in Example 1 except that 28.3 g of benzoic acid (3.4 mol% based on bisphenol A) was used. The obtained aromatic polycarbonate had a number average molecular weight of 21,000 and a weight average molecular weight of 51,500.

Example 8 Preparation of Aromatic Polycarbonate Having End Group No. 31 In Example 1, instead of using 2-ethoxy-5-tert-butylbenzoic acid, 3- (2'-methylpentyloxy) was used. Example 1 except that 32.7 g of benzoic acid chloride (3.4 mol% based on bisphenol A) was used.
An aromatic polycarbonate was produced in the same manner as in. The number average molecular weight of the obtained aromatic polycarbonate is 2080.
0, the weight average molecular weight was 5,1200.

Example 9 Preparation of Aromatic Polycarbonate Having End Group No. 33 In Example 1, instead of using 2-ethoxy-5-tert-butylbenzoic acid, 3- (3 ', 7'-dimethyl An aromatic polycarbonate was produced in the same manner as in Example 1 except that 35.6 g of octyloxy) benzoic acid (3.2 mol% based on bisphenol A) was used. The number average molecular weight of the obtained aromatic polycarbonate was 2150.
0, the weight average molecular weight was 52,700.

Comparative Example 1 For comparison, in Example 1, 2-ethoxy-5-te was used.
An aromatic polycarbonate was produced in the same manner as in Example 1 except that 20.4 g (3.4 mol% based on bisphenol A) of p-tert-butylphenol was used instead of using rt-butylbenzoic acid. The obtained aromatic polycarbonate had a number average molecular weight of 21,000 and a weight average molecular weight of 51,000.

Comparative Example 2 For comparison, in Example 1, 2-ethoxy-5-te was used.
An aromatic polycarbonate was produced in the same manner as in Example 1 except that 26.4 g of pn-hexyloxyphenol (3.4 mol% based on bisphenol A) was used instead of using rt-butylbenzoic acid. did. The obtained aromatic polycarbonate had a number average molecular weight of 20,800 and a weight average molecular weight of 51,300.

Comparative Example 3 For comparison, in Example 1, 2-ethoxy-5-te was used.
An aromatic polycarbonate was prepared in the same manner as in Example 1 except that 34.0 g of pn-octyloxybenzoic acid (3.4 mol% based on bisphenol A) was used instead of using rt-butylbenzoic acid. Manufactured. The obtained aromatic polycarbonate had a number average molecular weight of 20,700 and a weight average molecular weight of 50,800.

The molecular weight of each aromatic polycarbonate produced in each of the examples and comparative examples is GPC [gel permeation chromatography, manufactured by Showa Denko KK,
GPC system-11]. The results of the melt flow index (MI) and hydrolysis stability test of each aromatic polycarbonate produced in each Example and each Comparative Example are shown in Table 1 (Table 1).・ The melt flow index (MI) is S manufactured by Toyo Seiki.
It is measured with a -01 melt indexer under the conditions of a temperature of 280 ° C. and a load of 2.16 kg, and is shown by the weight (unit: g) of the polymer eluted in 10 minutes. The higher the number,
It shows that it has excellent melt fluidity. As the hydrolysis stability test, the weight average molecular weight (M of the cast film of each aromatic polycarbonate (thickness: 30 μm) after being immersed in hot water at 80 ° C. for 120 hours (M
w) was measured, and the reduction rate (%) from the weight average molecular weight before the test (before immersion) was determined by the following formula. The smaller the value, the better the hydrolysis stability.

[0054]

[Table 1]

From Table 1, the aromatic polycarbonate of the present invention is superior in melt flowability and hydrolysis stability as compared with the aromatic polycarbonate produced by using a known end-capping agent. I found out that In particular, the aromatic polycarbonate of the present invention having a terminal group derived from a benzoic acid derivative having a chain alkyloxy group at the ortho position or the meta position is a known phenol derivative having a chain alkoxy group at the para position or benzoic acid. It is very surprising that it has excellent hydrolysis stability as compared with an aromatic polycarbonate produced using an acid derivative as an end-capping agent.

[0056]

Industrial Applicability According to the present invention, it is possible to provide an aromatic polycarbonate having excellent melt fluidity and hydrolysis stability.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomonori Ito 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Mitsui Toatsu Chemical Co., Ltd. (72) Akihiro Yamaguchi 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Mitsui Toatsu Chemical Within the corporation

Claims (1)

[Claims] 1. An aromatic polycarbonate in which at least one of the terminal groups is a group represented by the general formula (1). -O-C (= O) -A -OR 1 (1) ( wherein, R ₁ represents a chain alkyl group, A represents a 1,2-phenylene group or 1,3-phenylene group)