JPH07196908A - Polycarbonate-based resin composition - Google Patents

Abstract

PURPOSE:To obtain a polycarbonate-based resin composition having improved melt fluidity only, showing excellent processability without reduction in physical properties, comprising an ordinary polycarbonate composed of an aromatic dihydroxy compound and a polycarbonate containing a specific end group in a specific ratio. CONSTITUTION:This resin composition having improved melt fluidity is obtained by blending (A) an ordinary polycarbonate prepared by polymerizing an aromatic dihydroxy compound [e.g. 2,2-bis(4'-hydroxyphenyl)propane, etc.] and a small amount of a phenol (e.g. p-t-butylphenol) in deionized water ip th,e presence of sodium hydroxide with phosgene introduced with (B) a polycarbonate containing an end group of the formula (R<1> and R<2> each is an alkyl) prepared by polymerizing the aromatic dihydroxy compound in deionized water in the presence of sodium hydroxide with phosgene introduced and adding a secondary amine (e.g. diethylamine) in the weight ratio of 90-99.9:10-0.1.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a polycarbonate resin composition, and more particularly to a polycarbonate resin composition having excellent melt flowability.

[0002]

2. Description of the Related Art Polycarbonate is widely used as a high-performance plastic having excellent impact resistance in the production of thermoplastic molded articles. General-purpose polycarbonate is
In addition to ductility (shock resistance), high transparency, wide limit temperature (high shock resistance under a wide range of temperature conditions), good dimensional stability, high creep resistance and used alone for conductive parts It has suitable electrical characteristics as a support (acceptable up to 125 ° C. without reduction in impact strength). Polycarbonates have low water absorption, good stain resistance and a wide range of tinting suitability. The weakness of polycarbonates is that they have a high melt viscosity and thus poor melt flowability, which makes molding somewhat difficult. Attempts have already been made to improve the melt flowability by blending various polymers with polycarbonate. For example, a polycarbonate resin composition having excellent melt fluidity has been produced by blending an ABS resin and a polycarbonate. However, although the composition of these resins has improved melt fluidity, it has a high heat resistance. It is inferior to polycarbonate in properties (deflection temperature under load) and mechanical strength. Compositions of these different types of polymers can cause various problems due to their poor compatibility. Also disclosed is an example in which a polycarbonate resin composition having improved melt fluidity is produced by mixing a low molecular weight polycarbonate with a polycarbonate (JP-A-61-212).
3658 gazette).

It is generally known that when a low molecular weight polycarbonate is added to the polycarbonate, the impact resistance of the polycarbonate is lowered [Proceedings of the Polymer Society of Japan, Vol. 38, No. 12, p4472 (1
989)]. However, in the polycarbonate composition disclosed in JP-A-61-123658, there is no discussion about the Izod impact value and the deflection temperature under load (HDT).
When the present inventors evaluated by adding a low molecular weight polycarbonate to the polycarbonate, Izod impact value,
It was found that the decrease in the deflection temperature under load was tremendous. Further, a polycarbonate having a carbamate end group is disclosed in U.S. Pat. No. 4,111,910, and the publication completely discusses the physical properties when a polycarbonate having a carbamate end group is mixed with an ordinary polycarbonate. There isn't. Thus, until now, there has been a demand for a polycarbonate resin composition having improved melt fluidity without deteriorating the excellent physical properties of polycarbonate.

[0004]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems of the prior art, and more specifically, it is a polycarbonate system having excellent melt fluidity without deteriorating the excellent physical properties of polycarbonate. A resin composition is provided.

[0005]

[Means for Solving the Problems] The inventors of the present invention have earnestly studied to solve the above problems and arrived at the present invention. That is, the present invention provides a conventional polycarbonate produced from an aromatic dihydroxy compound and a polycarbonate having an end group represented by the general formula (1) (Chemical Formula 2) produced from an aromatic dihydroxy compound in a weight ratio. 90 ~ 9
The present invention relates to a polycarbonate resin composition containing 9.9: 10 to 0.1.

[0006]

[Chemical 2] (In the formula, R ¹ and R ² represent an alkyl group)

The present invention is a polycarbonate resin composition containing the following components a and b. That is, a: a normal polycarbonate produced from an aromatic dihydroxy compound, and b: a polycarbonate having an end group represented by the general formula (1) produced from an aromatic dihydroxy compound, a polycarbonate system comprising: It is a resin composition.
In the polycarbonate resin composition of the present invention, the composition ratio of a and b is 90 to 99.9: 10 by weight ratio of a: b.
To 0.1, preferably 91 to 99.5: 9 to
It is 0.5, and more preferably 95-99: 5-1.

In the polycarbonate resin composition of the present invention, the usual polycarbonate produced from an aromatic dihydroxy compound is a polycarbonate produced from an aromatic dihydroxy compound and a carbonate precursor, and if desired, a molecular weight modifier and a branching agent. It is a polycarbonate produced by using an agent. Ordinary polycarbonate (hereinafter abbreviated as polycarbonate) produced from an aromatic dihydroxy compound is manufactured by Interscience P
ublishing, "Encyclopedia of Polymer Scienceand Tech
nology ", vol.10, Polycarbonate, p.710-764, (196
9), H. Schnell, "Chemistry and Physics of Polycarbo
nate ", Interscience Publishing, p. 9-76, (1964).

Another component of the polycarbonate resin composition of the present invention, a polycarbonate having an end group represented by the general formula (1), which is produced from an aromatic dihydroxy compound (hereinafter referred to as the general formula (1) Abbreviated as “polycarbonate having a terminal group”, R ¹ ,
R ² represents an alkyl group, preferably having 1 to 4 carbon atoms.
Represents an alkyl group. Specific examples of the alkyl group include a methyl group, an ethyl group, an n-propyl group, an isopropyl group,
Examples thereof include n-butyl group, isobutyl group and tert-butyl group. In the terminal group represented by the general formula (1),
R ¹ and R ² may be the same or different. Furthermore, the polycarbonate having an end group represented by the general formula (1) may have different types of end groups represented by the general formula (1).

Specific examples of the terminal group represented by the general formula (1) include, for example, a dimethylaminocarbonyloxy group,
Examples thereof include a diethylaminocarbonyloxy group, a methylethylaminocarbonyloxy group, a di-n-propylaminocarbonyloxy group and a di-n-butylaminocarbonyloxy group. Further, a part of the polycarbonate having a terminal group represented by the general formula (1) is described in US Pat.
No. 1910. The polycarbonate having a terminal group represented by the general formula (1) is usually produced by using a secondary amine as a molecular weight modifier.
Examples of the secondary amine include dimethylamine, diethylamine, methylethylamine, di-n-propylamine, di-n-butylamine and the like.

In the polycarbonate resin composition of the present invention, the polycarbonate and the polycarbonate having a terminal group represented by the general formula (1) are a polycarbonate produced from an aromatic dihydroxy compound and a carbonate precursor, respectively. In the present invention, the aromatic dihydroxy compound is a compound represented by the general formula (2) or (3). HO-Ar ¹ -X-Ar ² -OH (2) HO-Ar ³ -OH (3) (wherein Ar ¹ , Ar ² and Ar ³ are each a divalent aromatic group, and X is Ar ¹ Represents a linking group that connects Ar ² )

In the general formula (2) or (3), A
Each of r ¹ , Ar ² and Ar ³ represents a divalent aromatic group, preferably a phenylene group. The phenylene group may have a substituent, and examples of the substituent include a halogen atom, a nitro group, an alkyl group, a cycloalkyl group, an alkenyl group, an aralkyl group, an aryl group and an alkoxy group. Ar ¹ and Ar ² are both p-phenylene group, m-phenylene group or o-phenylene group, or one is p-phenylene group and the other is m-phenylene group or o-phenylene group. Particularly preferably, both Ar ¹ and Ar ² are p-phenylene groups. Ar ³ is a p-phenylene group, m-phenylene group or o-phenylene group, and preferably a p-phenylene group or m-phenylene group.

X is a linking group for connecting Ar ¹ and Ar ² , which is a single bond or a divalent hydrocarbon group, and further --O--,
It may be a group containing an atom other than carbon and hydrogen, such as —S—, —SO—, —SO ₂ — and —CO—. The divalent hydrocarbon group is, for example, an alkylidene group such as a methylene group, an ethylene group, a 2,2-propylidene group or a cyclohexylidene group,
It is a hydrocarbon group containing an alkylidene group substituted with an aryl group, an aromatic group or other unsaturated hydrocarbon group.

Specific examples of the aromatic dihydroxy compound include bis (4-hydroxyphenyl) methane, 1,1-bis (4'-hydroxyphenyl) ethane, 1,2-bis (4'-hydroxyphenyl) ethane, Bis (4-hydroxyphenyl) phenylmethane, bis (4-hydroxyphenyl) diphenylmethane, 1,1-bis (4'-hydroxyphenyl) -1-phenylethane, 2,2-bis (4'-hydroxyphenyl) propane ["Bisphenol A"], 2- (4'-
Hydroxyphenyl) -2- (3'-hydroxyphenyl) propane, 2,2-bis (4'-hydroxyphenyl) butane,
1,1-bis (4'-hydroxyphenyl) butane, 1,1-bis (4'-hydroxyphenyl) -2-methylpropane, 2,2-
Bis (4'-hydroxyphenyl) -3-methylbutane, 2,
2-bis (4'-hydroxyphenyl) pentane, 3,3-bis (4'-hydroxyphenyl) pentane, 2,2-bis (3'-
Methyl-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 ', 5'-dimethyl-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 (hydroxyaryl) alkanes such as bis (4'-hydroxyphenyl) hexafluoropropane,

1,1-bis (4'-hydroxyphenyl) cyclopentane, 1,1-bis (4'-hydroxyphenyl) cyclohexane, 1,1-bis (4'-hydroxyphenyl) cycloheptane, 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) -3,3,5-trimethyl Cyclohexane, 2,2-bis (4'-hydroxyphenyl) norbornane, bis (hydroxyaryl) cycloalkanes such as 2,2-bis (4'-hydroxyphenyl) adamantane, 4,4'-dihydroxydiphenyl ether, 3, Bis (hydroxyaryl) ethers such as 3'-dimethyl-4,4'-dihydroxydiphenyl ether and ethylene glycol bis (4-hydroxyphenyl) ether, 4,4'-dihydroxydiphenyl sulfide, 3,3'-
Dimethyl-4,4'-dihydroxydiphenyl sulfide, 3,
Bis (hydroxyaryl) sulfides such as 3 ', 5,5'-tetramethyl-4,4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxydiphenyl sulfoxide, 4,4'
-Bis (hydroxyaryl) sulfoxides such as dihydroxy-3,3'-dimethyldiphenylsulfoxide, 4,4 '
-Bis (hydroxyaryl) sulfones such as dihydroxydiphenylsulfone, 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfone, bis (4-hydroxyphenyl) ketone, bis (3-methyl-4-hydroxyphenyl) Bis (hydroxyaryl) ketones such as ketones,

Further, 6,6'-dihydroxy-3,3,3 ', 3'-
Tetramethyl spiro (bis) indan ["spirobiindane bisphenol"], 7,7'-dihydroxy-3,3 ', 4,
4'-tetrahydro-4,4,4 ', 4'-tetramethyl-2,2'-spirobi (2H-1-benzopyran), trans-2,3-bis (4'-hydroxyphenyl) -2-butene , 9,9-bis (4 '
-Hydroxyphenyl) fluorene, 1,6-bis (4'-hydroxyphenyl) -1,6-hexanedione, α, α,
α ', α'-tetramethyl-α, α'-bis (4-hydroxyphenyl) -p-xylene, α, α, α', α'-
Tetramethyl-α, α′-bis (4-hydroxyphenyl) -m-xylene, 4,4′-dihydroxybiphenyl, hydroquinone, resorcin and the like can be mentioned. Further, for example, an aromatic dihydroxy compound containing an ester bond, which can be produced by reacting 2 mol of bisphenol A with 1 mol of isophthaloyl chloride or terephthaloyl chloride, is also useful. These may be used alone or in combination of two or more. The aromatic dihydroxy compound used for producing the polycarbonate of the present invention and the polycarbonate having an end group represented by the general formula (1) is easily available,
It is preferable to use bisphenol A because of the physical properties of the polycarbonate produced.

The carbonate precursor used in producing the polycarbonate and the polycarbonate having an end group represented by the general formula (1) is a mono- or bishalogen compound of a carbonyl halide compound, a diaryl carbonate, a dialkyl carbonate or a dihydroxy compound. Formate derivatives, mono- or bishaloformate derivatives of oligomeric dihydroxy compounds, bisaryl carbonate derivatives of aromatic dihydroxy compounds, bisalkyl carbonate derivatives of aromatic dihydroxy compounds, bisaryl carbonate derivatives of oligomeric aromatic dihydroxy compounds , And bisalkyl carbonate derivatives of oligomeric aromatic dihydroxy compounds. Specific examples include carbonyl halides such as carbonyl chloride (phosgene), carbonyl bromide, carbonyl iodide and mixtures thereof, trichloromethylchloroformate which is a dimer of phosgene, and bis which is a trimer of phosgene. A haloformate of a dihydroxy compound derived from a dihydroxy compound such as (trichloromethyl) carbonate, 2,2-bis (4'-chlorocarbonyloxyphenyl) propane, 1,2-bis (chlorocarbonyloxy) ethane and a carbonyl halide compound. Derivatives, diphenyl carbonate, bis (2,4-dichlorophenyl) carbonate, bis (4
-Dichlorocarbonate such as chlorophenyl) carbonate, dialkyl carbonate such as dimethyl carbonate, diethyl carbonate, dipropyl carbonate, 2,2-bis (4'-methoxycarbonyloxyphenyl) propane, 2,2-bis (4'-phenoxycarbonyl) Examples thereof include bisalkyl carbonate derivatives and bisaryl carbonate derivatives of aromatic dihydroxy compounds such as oxyphenyl) propane.

Examples of the method for producing the polycarbonate and the polycarbonate having an end group represented by the general formula (1) include, for example, a carbonate precursor such as an aromatic dihydroxy compound and a carbonyl halide compound in an organic solvent, and a dehydrochlorination agent. A so-called solution method of reacting in the presence of, a carbonate precursor such as an aromatic dihydroxy compound and a carbonyl halide compound under a two-phase interface condition consisting of an organic solvent and water, optionally using a catalyst in the presence of a base, A so-called interfacial polymerization method produced by reacting,
A so-called transesterification method or the like in which an aromatic dihydroxy compound and a carbonate precursor such as a diaryl carbonate are reacted in a molten state in the presence of a catalyst, if desired, may be mentioned.

The interfacial polymerization method is a method preferably used for producing the polycarbonate of the present invention and the polycarbonate having an end group represented by the general formula (1),
More specifically, for example, A: A polycarbonate dimer having a lower molecular weight than an aromatic dihydroxy compound and a base and a carbonyl halide compound as a carbonate precursor under a two-phase interface condition of an organic solvent and water in the absence of a catalyst is included. Method B for producing a two-phase mixture, and then subjecting the oligomer to a polycondensation reaction in the presence of a catalyst to produce a polycarbonate B: an aromatic dihydroxy compound and an aromatic dihydroxy compound under the two-phase interface condition of an organic solvent and water in the presence of a catalyst Method C: A two-phase mixture containing a polycarbonate oligomer is prepared from a carbonyl halide compound as a base and a carbonate precursor, and then a catalyst is optionally added to the oligomer to carry out a polycondensation reaction to produce a polycarbonate. C: Presence of catalyst Under the two-phase interfacial condition of organic solvent and water, A method for producing a polycarbonate by subjecting a hydroxy compound, a base and a haloformate derivative of a dihydroxy compound as a carbonate precursor to polycondensation reaction can be mentioned.

The base used in the interfacial polymerization method is a hydroxide of an alkali metal or an alkaline earth metal such as sodium hydroxide, potassium hydroxide and calcium hydroxide, which is easily available. Potassium is preferred, especially sodium hydroxide. The organic solvent used in the interfacial polymerization method may be any as long as it is substantially insoluble in water, inert to the reaction, and capable of dissolving the polycarbonate oligomer and / or the polycarbonate. As the organic solvent, dichloromethane, chloroform, 1,2-dichloroethane, 1,2-dichloroethylene, trichloroethane, tetrachloroethane, aliphatic chlorinated hydrocarbons such as dichloropropane, chlorobenzene, aromatic chlorinated hydrocarbons such as dichlorobenzene, Or it is possible to use mixtures thereof. Further, it is also possible to use an organic solvent in which an aromatic hydrocarbon such as toluene, xylene and ethylbenzene, an aliphatic hydrocarbon such as hexane, heptane and cyclohexane is mixed with the chlorinated hydrocarbon or a mixture thereof. is there. Dichloromethane is preferred because of its excellent ability to dissolve polycarbonate.

In the polycarbonate resin composition of the present invention, the polycarbonate has a weight average molecular weight of about 100.
It is a polycarbonate of about 00 to about 100,000, preferably about 20,000 to about 90,000, more preferably about 30,000 to about 80,000, and further preferably about 40,000 to about 70,000. The polycarbonate may be a hydroxyl-terminated polycarbonate produced without using a molecular weight regulator, but is preferably a polycarbonate produced using a molecular weight regulator. The polycarbonate produced by using the molecular weight modifier is, for example, a polycarbonate end-capped with phenol or alkylphenol. Examples of the alkylphenol include p-tert-butylphenol, m-cresol, p-cresol, p-ethylphenol, p-cumylphenol, p-phenylphenol, p-cyclohexylphenol, p-octylphenol, p-nonylphenol and the like. Can be mentioned. Phenol, p-cumylphenol or p-tert-
Butylphenol is preferred.

The polycarbonate may be a branched polycarbonate, optionally produced using a branching agent. The branching agent optionally used is a compound having three or more (which may be the same or different) a reactive group selected from an aromatic hydroxy group, a haloformate group, a carboxyl group, a carbonyl halide group, and an active halogen atom. , Phloroglucinol, 4,6-dimethyl-2,
4,6-Tris (4'-hydroxyphenyl) -2-heptene, 4,6-dimethyl-2,4,6-tris (4'-hydroxyphenyl) heptane, 1,3,5-tris (4'- Hydroxyphenyl) benzene, 1,1,1-tris (4'-hydroxyphenyl) ethane, 1,3,5-tris (4'-hydroxyphenylisopropyl) benzene, α, α, α'-tris (4'- Hydroxyphenyl) -1-ethyl-4-isopropylbenzene, 2,6-bis (2-hydroxy-5'-methylbenzyl)-
4-methylphenol, 1,4-bis (4 ', 4''-dihydroxytriphenylmethyl) benzene, trimesic acid trichloride, cyanuric acid chloride, 3,5-dihydroxybenzoic acid, 5-hydroxyisophthalic acid . The polycarbonate having an end group represented by the general formula (1) of the present invention has a weight average molecular weight of about 10,000 to 100,000.
And preferably about 10,000 to 80,000, and more preferably about 20,000 to 70,000.

The polycarbonate resin composition comprising the polycarbonate and the polycarbonate having an end group represented by the general formula (1) can be produced by any convenient method. In the usual case, a blend obtained by simply blending a dry powder of polycarbonate and a polycarbonate having an end group represented by the general formula (1) together on a mechanical mixer has a softening point of these polymer components. Mix by passing through the extruder at a higher temperature. Alternatively, as another method, the polycarbonate and the polycarbonate having an end group represented by the general formula (1) are dissolved in an organic solvent common to them, and then the organic solvent is evaporated or distilled from the obtained solution, or It can be recovered by precipitating the polymer in the compounded state. The resulting polycarbonate-based resin composition may, if desired, be in a standard proportion of conventional additives such as heat stabilizers such as phosphites, antioxidants such as sterically hindered phenols,
It can be further improved by incorporating a release agent or the like. The polycarbonate resin composition of the present invention can be used in various applications including applications for compact discs and automobiles.

[0024]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples. Table 1 (Table 1) shows Examples 1 to 5 and Comparative Examples 1 to 1.
The physical properties of the polycarbonate of No. 3 are shown. In addition, each measured value of an Example and a comparative example was measured by the following method. -Izod impact value: According to JIS K 7110. That is, a test piece having a notch having a depth of 2.54 mm, a thickness of 3.2 mm, and a length × width of 64 × 12.6 mm was prepared, and the Izod impact value was measured. Deflection temperature under load (HDT): Based on JIS K 7207. That is, a test piece having a thickness of 3 mm and a length × width of 110 × 12.6 mm was prepared, and the test piece at 120 ° C.
Bending stress after annealing for 18.5 kgf / cm
^The deflection temperature under load (HDT) was measured at ² . Melt flowability: Melt flow index (MI) was measured using a Toyo Seiki Co., Ltd. S-01 melt indexer under the conditions of a temperature of 280 ° C. and a load of 2.16 kg. The larger the value, the better the melt flowability.

Synthesis Example 1: Production of Polycarbonate A flask equipped with a baffle having an internal volume of 10 liters was equipped with a stirrer having a Maxblend blade, a reflux cooling tube, and a dipping tube for blowing phosgene. 912g in this flask
(4.0 mol) bisphenol A, 20.64 g
(0.1376 mol, 3.4 with respect to bisphenol A
(4 mol%) p-tert-butylphenol, 4 liters of dichloromethane, 4 liters of deionized water were added to form a suspension, and a nitrogen purge was performed to remove oxygen in the flask. Next, 2.2 liters of an aqueous sodium hydroxide solution in which 448 g (11.2 mol) of sodium hydroxide and 1.2 g of sodium hydrosulfite were dissolved was supplied to the above suspension to dissolve bisphenol A.
Next, 466.9 g (4.72 mol) of phosgene was added to the aqueous solution of bisphenol A in sodium hydroxide.
It was blown at a feed rate of 78 g / min. After the phosgene feed was completed, 0.64 g of triethylamine was added,
By stirring and mixing, the polycondensation reaction of the polycarbonate oligomer was performed. After stirring for 60 minutes, the stirring was stopped, and the two-phase mixture was allowed to stand for liquid separation, then the organic phase was neutralized with dilute hydrochloric acid, and the electrolyte was substantially dissolved in the aqueous phase with deionized water. Washed until no longer detectable. Then, 2 liters of toluene and 5 liters of water were added to a dichloromethane solution of this polycarbonate,
Dichloromethane and toluene were distilled off by heating to 8 ° C to obtain a polycarbonate powder. The weight average molecular weight of the obtained polycarbonate is 55,000.
Met.

Synthetic Example 2: Production of Polycarbonate Having End Group Represented by General Formula (1) In Synthetic Example 1, 20.64 g of p-tert-butylphenol was not used, and 1 was obtained after the supply of phosgene was completed.
A polycarbonate represented by the general formula (1) was produced by the same operation as in Synthesis Example 1, except that 6.82 g (0.2304 mol) of diethylamine was added. The weight average molecular weight of the obtained polycarbonate was 54,000.

Example 1 As the polycarbonate, the polycarbonate having a weight average molecular weight of 55,000 produced in Synthesis Example 1 and the general formula (1) were used.
The polycarbonate having a weight average molecular weight of 54000 produced in Synthesis Example 2 as a polycarbonate having an end group represented by the formula: 95: 5 in a weight ratio and mixed with a Henschel mixer, and then a screw diameter of 30 mmφ, L / D = 3.
It was extruded with a twin screw extruder of 0 at a melting temperature of 280 ° C. and a screw rotation speed of 100 rpm to obtain pellets. The pellets were injection-molded into test pieces, which were used for physical property tests. The results are shown in Table 1. Excellent melt flowability,
It can be seen that the mechanical strength and heat resistance are not lower than those of the polycarbonate alone of Comparative Example 1.

Examples 2 to 5 The same as Example 1 except that the polycarbonate and the polycarbonate having an end group represented by the general formula (1) were mixed in the mixing ratio shown in Table-1. The operation was performed. The results are shown in Table-1. It is understood that all of them have excellent melt fluidity, and the mechanical strength and heat resistance are not lower than those of the polycarbonate alone.

Comparative Example 1 In Example 1, the polycarbonate having an end group represented by the general formula (1) was not used, that is,
Table 1 shows the results of the physical property test of the polycarbonate alone.
This had poor melt flowability. Comparative Example 2 In Example 1. Example 1 except that the addition amount of the polycarbonate having an end group represented by the general formula (1) was changed.
The same operation was performed. Table 1 shows the compounding ratio and the result of the physical property test. Although the melt fluidity was improved, the mechanical strength and heat resistance decreased.

Synthesis Example 3 Production of Polycarbonate Oligomer A flask equipped with a baffle having an internal capacity of 10 liters was equipped with a stirrer having a Maxblend blade, a reflux cooling tube, and a dipping tube for blowing phosgene. 912g in this flask
(4.0 mol) bisphenol A, 217.83 g
(1.4522 mol, 34.
66 mol% of p-tert-butylphenol, 4 liters of dichloromethane, 4 liters of deionized water,
A suspension was obtained and a nitrogen purge was performed to remove oxygen in the flask. Next, 700 g (17.
(5 mol) of sodium hydroxide and 1.2 g of sodium hydrosulfite were dissolved in 2.2 liter of an aqueous solution of sodium hydroxide to supply bisphenol A. Next, 625.2 g (6.32 mol) of phosgene was added to the sodium hydroxide aqueous solution of bisphenol A.
It was blown at a feed rate of 20.84 g / min. After the supply of phosgene was completed, 0.64 g of triethylamine was added and mixed with stirring to carry out a polycondensation reaction. 60
After stirring for a minute, the stirring was stopped, and the two-phase mixture was allowed to stand to separate the liquid, and then the organic phase was neutralized with dilute hydrochloric acid, and the electrolyte was substantially added to the aqueous phase with deionized water. Washed until no longer detected. Then, 2 liters of toluene and 5 liters of water were added to the dichloromethane solution of the polycarbonate oligomer, and the mixture was heated to 98 ° C. to distill off the dichloromethane and toluene to obtain a powder of the polycarbonate oligomer. The weight average molecular weight of the obtained polycarbonate oligomer was 53.
It was 00.

Comparative Example 3 In place of the polycarbonate having a terminal group represented by the general formula (1) in Example 1, the polycarbonate oligomer produced in Synthesis Example 3 was blended in the blending ratio shown in Table 1. The same operation as in Example 1 was performed. The results are shown in Table-1. Although the melt fluidity was improved, the mechanical strength and heat resistance decreased.

[0032]

[Table 1] * 1: Compounding ratio (weight ratio), PC: Polycarbonate, (1): Polycarbonate having a terminal group represented by the general formula (1), PCO: Polycarbonate oligomer * 2: Izod impact strength (kg · cm / cm) ) * 3: Deflection temperature under load (° C) * 4: Melt flow index (g / 10 min) As shown in Table-1, the polycarbonate resin composition of the present invention does not deteriorate the physical properties of the polycarbonate, and melt flow. It is a polycarbonate resin composition having improved properties only. According to the present invention, a polycarbonate resin composition having excellent melt fluidity, that is, excellent processability was obtained.

[0033]

Industrial Applicability According to the present invention, it is possible to provide a polycarbonate-based resin composition in which only the melt fluidity is improved without deteriorating the physical properties of ordinary polycarbonate.

 ─────────────────────────────────────────────────── (72) Inventor Masakatsu Nakatsuka 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Mitsui Toatsu Chemical Co., Ltd. (72) Akihiro Yamaguchi 1190 Kasama-cho, Sakae-ku, Yokohama, Kanagawa Mitsui Toatsu Chemical Within the corporation

Claims (1)

[Claims] 1. A normal polycarbonate produced from an aromatic dihydroxy compound and a polycarbonate having an end group represented by the general formula (1) (Chemical formula 1) produced from an aromatic dihydroxy compound, in a weight ratio. 90-9
A polycarbonate resin composition containing 9.9: 10 to 0.1. [Chemical 1] (In the formula, R ¹ and R ² represent an alkyl group)