JP3130549B2 - Method for producing resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel method for producing a resin composition. More specifically, the present invention relates to a homogeneous resin composition obtained by blending polyamide with aromatic polycarbonate, polyarylate, or polyester carbonate, which is excellent in impact resistance and heat resistance and can give a molded article having good appearance. The present invention relates to a method for efficiently producing a polyamide without causing deterioration of the polyamide.

[0002]

2. Description of the Related Art Conventionally, polycarbonate resins are excellent in mechanical properties such as rigidity and impact resistance, electrical properties, and dimensional stability. Widely used.

However, since this polycarbonate resin has poor solvent resistance, it has a drawback that it is difficult to use it in applications requiring solvent resistance, and in particular, when it is used in the field of automobiles, its use is limited. Absent. In addition, heat resistance is not always satisfactory.

Therefore, in order to improve the solvent resistance and heat resistance of polycarbonate, for example, a resin composition in which a polyarylate, a polyamide and an elastomer are blended with the polycarbonate has been proposed (JP-A-1-234460).
No.). As a method for producing such a resin composition,
Generally, a melt kneading method using an extruder is used. However, when simultaneously melting and kneading a polyamide with polycarbonate, polyarylate, polyester carbonate, etc., compared with polyamide, polycarbonate,
Polyarylates and polyester carbonates have extremely high plasticizing temperatures and extremely high melt viscosities, making it difficult to obtain a homogeneous resin composition.In addition, they require high melting temperatures and long melting times. Therefore, molded articles obtained from such a composition have problems such as low impact strength and poor appearance.

Further, as a method for producing a composition comprising polyarylate, polyamide, polycarbonate and the like,
A method is disclosed in which a resin composition containing a polyarylate having a desired composition ratio or more is prepared in advance by a melt-kneading method, and then this composition and another resin are melt-kneaded to produce a target composition. JP-B-60-7659).

However, in this method, although the impact strength of the composition is improved, it is necessary to perform multi-stage melt kneading, so that the cost is inevitably increased, and polyamide is used as another resin. When used, they have disadvantages such as being difficult to be homogeneously melt-dispersed and deteriorating the polyamide.

[0007]

SUMMARY OF THE INVENTION Under such circumstances, an object of the present invention is to provide an aromatic polycarbonate, a polyarylate or a polyester which can provide a molded article having excellent impact resistance and heat resistance and having a good appearance. An object of the present invention is to provide a method for efficiently producing a homogeneous resin composition in which a polyamide is blended with a carbonate without causing deterioration of the polyamide.

[0008]

Means for Solving the Problems The present inventors have conducted intensive studies to achieve the above object, and as a result, first, at least one selected from aromatic polycarbonates, polyarylates and polyester carbonates has been obtained. After melting or melt-kneading, the polyamide or resin mixture in this molten state is added with polyamide at a predetermined ratio one or more times, and is melt-kneaded for a specific time to find that the object can be achieved. The present invention has been completed based on the findings.

That is, in the present invention, when producing a resin composition containing (A) at least one kind selected from aromatic polycarbonate, polyarylate and polyester carbonate and (B) polyamide, After the component (A) is melted or melt-kneaded, the required amount of the component (B) is added to the molten component (A) once or in two or more portions. An object of the present invention is to provide a method for producing a resin composition, which comprises melting and kneading the components so that the ratio of the residence time of the component (B) is 0.05 to 0.8.

In the composition of the present invention, at least one selected from aromatic polycarbonates, polyarylates and polyester carbonates is used as the component (A). The aromatic polycarbonate has a general formula

Embedded image

(Wherein Z is an alkylene group having 1 to 8 carbon atoms, an alkylidene group having 2 to 8 carbon atoms, a cycloalkylene group having 5 to 15 carbon atoms, a cycloalkylidene group having 5 to 15 carbon atoms, a mere bond, -SO _2- , -SO-, -S-,
-O-, -CO- or

Embedded image

R ¹ and R ² are a hydrogen atom, a chlorine atom, a bromine atom or an alkyl group having 1 to 8 carbon atoms, which may be the same or different, and
And n are each an integer of 1 to 4, and m is 2 to 4
In the case of R ¹ may be different,
When n is 2 to 4, R ² may be different from each other).

The aromatic polycarbonate is prepared by reacting a dihydric phenol with a carbonate precursor such as phosgene in a solvent such as methylene chloride in the presence of a known acid acceptor or a molecular weight regulator, or It can be produced by a transesterification reaction between phenol and a carbonate precursor such as diphenyl carbonate.

As the dihydric phenol, for example,
2-bis (4-hydroxyphenyl) propane (bisphenol A), 2,2-bis (3-methyl-4-hydroxyphenyl) propane, 2,2-bis (3,5-dimethyl-4-hydroxyphenyl) propane , 1,2-bis (4-hydroxyphenyl) ethane, 3,3-bis (4-hydroxyphenyl) pentane, 1,1- (4-
Hydroxyphenyl) cyclohexane, 4,4'-dihydroxydiphenyl, bis (4-hydroxyphenyl)
Sulfide, bis (4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) sulfoxide, bis (4-hydroxyphenyl) ether, 4,4′-dihydroxybenzophenone, or 2,2-bis (3,5-dibromo -4-Hydroxyphenyl) propane, 2,2-bis (3,5-dichloro-4-hydroxyphenyl) propane, 2,2-bis (3-chloro-4-
Examples thereof include halogenated bisphenols such as (hydroxyphenyl) propane and 2,2-bis (3-bromo-4-hydroxyphenyl) propane.
Among these dihydric phenols, especially bisphenol A
Is preferred. These dihydric phenols may be used alone or in combination of two or more. Further, the aromatic polycarbonate used in the present invention may be a thermoplastic random branched aromatic polycarbonate obtained by reacting a polyfunctional aromatic compound with a carbonate precursor or a dihydric phenol and a carbonate precursor, It may be a blend of two or more aromatic polycarbonates.

The aromatic polycarbonate has a viscosity average molecular weight of 10,000 from the viewpoint of mechanical strength and moldability.
It is preferably from 0 to 100,000, particularly 15,000.
Those having 0 to 40,000 are preferred.

The polyarylate is a compound of the general formula: isophthalic acid alone or a mixture of isophthalic acid and terephthalic acid containing at least 10 mol% of isophthalic acid.

Embedded image

(Wherein Y is an alkylene group, alkylidene group, —O—, —S—, —SO ₂ — or —CO—, and R ³ and R ⁴ are each a hydrogen atom, a halogen atom or a hydrocarbon group. , They may be the same or different, and p and q are each an integer of 1 to 4,
Is 2 to 4, R ³ may be different from each other, and when q is 2 to 4, R ⁴ may be different from each other.) It is obtained by reacting. The isophthalic acid or terephthalic acid may be a reactive derivative thereof, for example, an acid halide or an ester, or may have a halogen atom such as a bromine atom or an alkyl group in an aromatic ring. .

Examples of the dihydric phenol represented by the general formula (II) include 4,4'-dihydroxydiphenyl ether, bis (4-hydroxy-2-methylphenyl) ether and bis (4-hydroxy-3-chlorophenyl) ) Ether, bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) sulfone,
Bis (4-hydroxyphenyl) ketone, bis (4-hydroxyphenyl) methane, bis (4-hydroxy-3)
-Methylphenyl) methane, bis (4-hydroxy-
3,5-dichlorophenyl) methane, bis (4-hydroxy-3,5-dibromophenyl) methane, bis (4-
(Hydroxy-3,5-difluorophenyl) methane,
1,1-bis (4-hydroxyphenyl) ethane, 2,
2-bis (4-hydroxyphenyl) propane (bisphenol A), 2,2-bis (4-hydroxy-3-methylphenyl) propane, 2,2-bis (4-hydroxy-3-chlorophenyl) propane, 2, 2-bis (4
-Hydroxy-3,5-dichlorophenyl) propane,
2,2-bis (4-hydroxy-3,5-dibromophenyl) propane (tetrabromobisphenol A),
1,1-bis (4-hydroxyphenyl) -n-butane, bis (4-hydroxyphenyl) phenylmethane,
Bis (4-hydroxyphenyl) diphenylmethane, bis (4-hydroxyphenyl) -4-methylphenylmethane, 1,1-bis (4-hydroxyphenyl) -2,
2,2-trichloroethane, bis (4-hydroxyphenyl)-(4′-chlorophenyl) methane, 1,1-bis (4-hydroxyphenyl) cyclohexane, bis (4-hydroxyphenyl) cyclohexylmethane,
Examples thereof include 2,2-bis (4-hydroxynaphthyl) propane, and representative of these are bisphenol A and tetrabromobisphenol A.

These dihydric phenols may be used alone or in combination of two or more. If necessary, a small amount of another dihydric phenol such as 2,2'-dihydroxydiphenyl may be used. Dihydroxynaphthalenes such as 2,6-dihydroxynaphthalene, hydroquinone, resorcinol, 2,6-dihydroxydichlorobenzene, 2,6-dihydroxytoluene, 3,
It may be used in combination with 6-dihydroxytoluene or the like. Further, the dihydric phenol and the alkylene glycol may be used in combination. In this case, the molar ratio of the dihydric phenol to the alkylene glycol is preferably in the range of 100: 1 to 100: 100.

Further, the polyester carbonate generally contains a carbonate group, a carboxylate group and an aromatic ring repeatedly in a linear polymer chain, and is obtained by reacting an aromatic dicarboxylic acid or a reactive derivative thereof, a dihydric phenol and a carbonate precursor. It can be manufactured by doing.

Preferred examples of the polyester carbonate include those obtained from bisphenol A, isophthalic acid or terephthalic acid, or a mixture thereof and phosgene. Isophthalic acid or terephthalic acid may be a reactive derivative thereof, such as terephthaloyl dichloride or isophthaloyl dichloride.

Among these polyester carbonates, those containing both terephthalate units and isophthalate units are preferred. Further, the content of all ester units is desirably in the range of 25 to 90 mol%, preferably 35 to 90 mol%, and the content of terephthalate units is preferably 2 to 90 mol%, preferably 5 to 50 mol%. Advantageously in the range.

In the present invention, as the component (A),
At least one of the three resins may be used alone or in combination. Examples of the combination include a combination of an aromatic polycarbonate and a polyarylate, and a combination of an aromatic polycarbonate and a polyester carbonate.

In the composition of the present invention, the component (B) is represented by the general formula

Embedded image Or

Embedded image (In the formula, R ⁵ , R ⁶ and R ⁷ are each an alkylene group, but may be partially substituted with an aromatic group or an alicyclic group, and r and s each indicate the degree of polymerization.) The polyamides represented are used.

This polyamide can be produced by a condensation reaction of a diamine and a dibasic acid, a self-condensation reaction of an amino acid, or a polymerization reaction of a lactam. May be included.

In the present invention, any polyamide can be used as long as it is represented by the above general formulas (III) and (IV). Preferred polyamides include, for example, nylon 6, nylon 66, nylon 12, and nylon 12. Nylon 46 and the like.

In the present invention, the component (A) and the component (B) usually contain 1 to 99% by weight and 99% by weight, respectively.
-1% by weight, preferably 15-85% by weight and 85-1% by weight.
Used at a rate of 5% by weight.

The resin composition according to the present invention, together with the above-mentioned essential components, may optionally contain various additives such as an inorganic filler, a rubber-like elastic material, and various additives as long as the object of the present invention is not impaired. And other synthetic resins, elastomers and the like.

The inorganic filler is blended for the purpose of improving or increasing the mechanical strength and durability of the resin composition. Examples of such a filler include glass fibers, glass beads, glass flakes, and the like. Examples include carbon black, calcium sulfate, calcium carbonate, calcium silicate, titanium oxide, alumina, silica, asbestos, talc, clay, mica, and quartz powder.

The rubber-like elastic material used as desired may be, for example, (1) a vinyl-based monomer in the presence of a rubber-like polymer obtained from a monomer mainly composed of alkyl acrylate or alkyl methacrylate. And those obtained by polymerizing one or more of the bodies. Here, the alkyl acrylate or alkyl methacrylate is preferably an alkyl group having 2 to 10 carbon atoms,
Specifically, ethyl acrylate, butyl acrylate,
2-ethylhexyl acrylate, n-octyl methacrylate and the like can be mentioned. Examples of the rubbery polymer obtained from these monomers mainly containing alkyl acrylates include other vinyl monomers copolymerizable with 70% by weight or more of the alkyl acrylates, such as methyl methacrylate, acrylonitrile, Polymers obtained by reacting with 30% by weight or less of vinyl acetate, styrene and the like are exemplified. In this case, a polyfunctional monomer such as divinylbenzene, ethylene dimethacrylate, triallyl cyanurate, triallyl isocyanurate or the like may be appropriately added as a crosslinking agent and reacted. Examples of the vinyl monomer to be reacted in the presence of the rubbery polymer include styrene, aromatic vinyl compounds such as α-methylstyrene, methyl acrylate, acrylates such as ethyl acrylate, methyl methacrylate, And methacrylic acid esters such as ethyl methacrylate.

One of these monomers may be used, or 2
It may be used in combination of more than one kind, and may be copolymerized with other vinyl monomers, for example, vinyl cyanide compounds such as acrylonitrile and methacrylonitrile, and vinyl esters such as vinyl acetate and vinyl propionate. Is also good. This polymerization reaction is, for example, bulk polymerization, suspension polymerization,
It can be performed by various methods such as emulsion polymerization,
Particularly, an emulsion polymerization method is preferable.

This rubber-like elastic body contains 20 parts of the rubber component.
Preferably, it is contained in an amount of at least% by weight. Specific examples of such a rubber-like elastic material include a MAS resin elastic material such as a graft copolymer of 60-80% by weight of n-butyl acrylate with styrene and methyl methacrylate, and a copolymer of styrene and methyl methacrylate. An MS resin elastic body, which is a polymer, may be used. As the MAS resin elastic body,
For example, "KM-330" (trade name, manufactured by Rohm & Haas), "METABLEN W529" [Mitsubishi Rayon Co., Ltd.
Manufactured, trade name].

The rubbery elastic material includes (2) a copolymer obtained by copolymerizing an alkyl acrylate or an alkyl methacrylate with a polyfunctional polymerizable monomer having a conjugated diene double bond. And those obtained by polymerizing one or more vinyl monomers.
Examples of the alkyl acrylate and alkyl methacrylate include those exemplified in the above (1). Examples of the polyfunctional polymerizable monomer having a conjugated diene double bond include, for example, conjugated diene compounds such as butadiene and isoprene, and non-conjugated double bonds other than conjugated diene double bonds in one molecule. Compounds. Such compounds include, for example, 1-methyl-2-vinyl-
4,6-heptadien-1-ol, 7-methyl-3-
Methylene-1,6-octadiene, 1,3,7-octatriene and the like can be mentioned.

In copolymerizing the above-mentioned alkyl acrylate or alkyl methacrylate with a polyfunctional polymerizable monomer having a conjugated diene-type double bond, an aromatic vinyl compound such as styrene or α-methylstyrene may be used, if necessary. Addition of vinyl monomers such as vinyl cyanide compounds such as acrylonitrile and methacrylonitrile; vinyl ester compounds such as vinyl acetate and vinyl propionate; vinyl ether compounds such as methyl vinyl ether; and halogenated vinyl compounds such as vinyl chloride. Can also be. Further, a crosslinking agent such as ethylene dimethacrylate or divinylbenzene may be added.

In producing a copolymer by copolymerizing the above-mentioned alkyl acrylate or alkyl methacrylate with a polyfunctional polymerizable monomer having a conjugated diene-type double bond, the conjugated diene-type double bond is The polyfunctional polymerizable monomer is desirably used in such a ratio that the content of the unit in the copolymer is 0.1 to 20% by weight, preferably 1 to 10% by weight.

As the vinyl monomer to be polymerized into the copolymer thus obtained, those exemplified in the above (1) can be exemplified. These vinyl monomers are 1
Species may be used, or two or more may be used in combination. The polymerization reaction can be performed by various methods such as bulk polymerization, suspension polymerization, and emulsion polymerization, and an emulsion polymerization method is particularly preferable.

Preferred examples of such a rubber-like elastic material include, firstly, alkyl (meth) acrylates such as n-butyl acrylate, 2-ethylhexyl acrylate and methyl methacrylate and butadiene, and ethylene dimethacrylate and divinyl benzene. It is obtained by copolymerizing a small amount of a crosslinking agent with a conventional method, adding a vinyl monomer such as styrene, acrylonitrile, or vinyl chloride as a graft component monomer to the obtained latex, and performing graft polymerization by a conventional method. A graft copolymer.

Second, the above-mentioned alkyl (meth) acrylate is copolymerized with a compound having a non-conjugated double bond in addition to a conjugated diene-type double bond in one molecule by a conventional method. A graft copolymer obtained by adding the above-mentioned vinyl monomer as a graft component monomer to the obtained latex and subjecting it to graft polymerization by a conventional method is exemplified. Here, the graft polymerization may be performed in one stage, or may be performed in multiple stages by changing the constituent components of the graft component monomer.

As a specific example of such a rubber-like elastic material, octyl acrylate and butadiene are used in a weight ratio of 7:
3, a styrene and methyl methacrylate are added to a rubber latex obtained by copolymerization, and a MABS resin elastic material such as a graft copolymer obtained by graft polymerization is used. MBS resin elastic bodies such as a graft copolymer obtained by adding styrene to a rubber latex obtained by copolymerizing styrene and butadiene and performing graft polymerization.

Examples of various additives used as desired include antioxidants such as hindered phenols, phosphites and amines, ultraviolet absorbers such as benzotriazoles and benzophenones, and hindered amines. Based light stabilizers, external lubricants such as aliphatic carboxylic acid esters and paraffins, common flame retardants,
Examples include a release agent, an antistatic agent, and a coloring agent.

Other synthetic resins include, for example, polyethylene, polypropylene, AS resin, ABS resin, and polymethyl methacrylate.

In the method of the present invention, the resin composition comprises:
First, the component (A) is melted or melt-kneaded, and then the component (B) and various additional components used as necessary are added to the component (A) in the molten state once or twice or more. It is manufactured by adding and melt-kneading.
At this time, the retention time of the component (B) needs to be in the range of 0.05 to 0.8 with respect to the entire retention time. If the residence time ratio is less than 0.05, sufficient melt-kneading cannot be achieved, and if it exceeds 0.8, the polyamide tends to be significantly deteriorated. In order to obtain a homogeneous composition in which the degree of deterioration of the polyamide is small and the ratio of the residence time of the component (B) to the entire residence time is 0.1 to 0.1.
It is preferably in the range of 5.

The kneading apparatus used for the preparation of the composition may be any as long as the component (A) is in a molten state and the component (B) can be supplied thereto and can be melt-kneaded. There is no particular limitation, for example, a Banbury mixer, a single screw extruder, a twin screw extruder, a multi-screw extruder, etc., any of which can be used. Preferred twin screw extruders are preferred.

The temperature for kneading is usually from 260 to 320.
It is selected in the range of ° C. If the temperature is lower than 260 ° C., it is difficult to melt the component (A). If the temperature is higher than 320 ° C., the polyamide may be deteriorated.

When producing a resin composition using the twin screw extruder, the component (A) is supplied from the top,
When the component (B) is supplied from the side, the component (A) is in a molten state. The residence time of the component (B) can be controlled by changing the position of the hole supplied from the side.

According to this method, it is possible to control the melting time of the polyamide, so that the deterioration of the polyamide can be prevented, and the component (A) having a higher plasticization temperature and a higher melt viscosity than the polyamide does not contain the component. A homogeneous resin composition can be obtained without being in a molten state. Further, the component (B) does not necessarily need to be supplied from one place, and may be supplied from two or more places.
One or more elastomers, additives, other resins, etc. may be supplied.

[0047]

The resin composition obtained by the method of the present invention is characterized in that the deterioration of the polyamide is suppressed and that it is homogeneous.
The impact strength is remarkably improved, and foaming and delamination of the molded article are suppressed, so that a molded article having a good appearance can be obtained.

Further, according to the method of the present invention, one continuous melt-kneading is possible, so that the desired composition can be manufactured in a simple process in a short time, which is economically advantageous. . Further, the method of the present invention can control the residence time, so that it is effective for producing a composition accompanied by a reaction.

[0049]

Next, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples. The extrusion state of the composition and the physical properties of the test pieces were determined as follows.

(1) Extrusion status Burning and foaming were evaluated by the following symbols, and the extrusion status was determined. Burn; ○: None, △: Slightly present, ×: Available Foaming: ○: None, △: Slightly available, ×: Available

(2) Izod impact strength Determined according to ASTM D-256 (1/8 inch wall thickness).

(3) Heat deformation temperature According to ASTM D-648, a load of 18.6 kg / c
The heat deformation temperature was determined under the conditions of m ² and 1/8 inch wall thickness.

The following were used as each component. PC: polycarbonate, manufactured by Idemitsu Petrochemical Co., Ltd., A2
200 PAR: Polyarylate, manufactured by Unitika Ltd., U-10
0T PEC: polyester carbonate, manufactured by GE, PPC
4701 Elastomer: Hybrene B62 manufactured by Zeon Corporation
1 PA6: Polyamide, manufactured by Ube Industries, Ltd., 1013 PA66: Polyamide, manufactured by Ube Industries, Ltd., 2020 GF: Glass fiber, manufactured by Asahi Fiberglass Co., Ltd., CS
03MA419

Examples 1 to 10 and Comparative Examples 1 to 6 Compositions were prepared using a twin screw extruder [TEM-35, manufactured by Toshiba Machine Co., Ltd., L / D = 32] shown in FIG. .

First, each component having the type and amount shown in Table 1 was supplied from the top feed 1, and each component having the type and amount shown in Table 1 was supplied from the side feed I2 and the side feed II3. The set temperature of the extruder is N / C5 / C4 / C3
/ C2 / C1 = 280/260/260/300/30
The temperature was 0/300 ° C., and the mixture was extruded and kneaded at 300 rpm to form pellets.

Next, the obtained pellets were dried at 120 ° C. for 5 hours, and then subjected to an injection molding machine [IS100EN, manufactured by Toshiba Machine Co., Ltd., cylinder temperature 280 ° C., mold temperature 80 °
[° C.], and the physical properties were evaluated. Table 1 shows the results.

[Table 1]

As can be seen from Table 1, in Examples 1 to 3, the polyamide was side-fed to
Kneading is possible without burning or foaming. In Comparative Examples 1 and 2, burning and foaming were severe, the preparation of the composition was impossible in Comparative Example 2, and the impact strength in Comparative Example 1 was extremely low.

In Examples 4 to 7, two kinds of resins were used as the component (A), but the same results as in Examples 1 to 3 were obtained. In Examples 8 to 10, elastomers and glass fibers were used as other components, but similar results to Examples 1 to 3 were obtained.
Elastomers do not affect the appearance and physical properties of either top feed or side feed. In contrast, Comparative Examples 3 to 6 all suffered from severe burning and foaming.

Examples 11 to 13 and Comparative Example 7 As shown in FIG. 2, top feed 1, side feed I2, side feed II3, side feed III
4. Using a twin screw extruder having a side feed IV5, the composition was prepared by changing the ratio of the retention time of the component (B) / total residence time. The residence time was defined as the time until the color of the strand was colored by charging the color pellets into the supply holes together with the raw materials.

From the top feed, polycarbonate (P
C) A mixture of 50 parts by weight of polyarylate (PAR) and 30 parts by weight of polyarylate (PAR) was supplied, and 20 parts by weight of polyamide (PA6) was supplied while changing the position of the side feed as shown in Table 2. After pelletization in the same manner as in Examples 10 to 10, a test piece was prepared and the physical properties were evaluated. Table 2 shows the results. Table 2 also shows the results of Example 6 and Comparative Example 3.

Comparative Example 7 was obtained by dry blending a polyamide with a kneaded product of polycarbonate / polyarylate before injection molding, and burning and foaming were due to the molded product.

[Table 2]

As can be seen from Table 2, the residence time ratio was 0.1.
When it is in the range of 1 to 0.5, the extrusion condition is good and the physical properties such as impact strength are also good. In addition, the residence time ratio is 0.6
In Example 12 of Comparative Example 0, the residence time of the polyamide was long and burning slightly occurred, but the physical properties were better than those of Comparative Examples 3 and 7 outside the scope of the present invention. In Comparative Example 3, the polyamide deteriorated, and in Comparative Example 7, the dispersion state of the polyamide was poor, and the impact strength was low.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a twin screw extruder used in Examples 1 to 10 and Comparative Examples 1 to 6.

FIG. 2 is a schematic view of a twin screw extruder used in Examples 11 to 13 and Comparative Example 7.

[Explanation of symbols]

 1: Top feed, 2: Side feed I, 3: Side feed II, 4: Side feed III, 5: Side feed IV, 6: Vent hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-92861 (JP, A) JP-A-52-100552 (JP, A) JP-A-60-170666 (JP, A) JP-A 48-48 74557 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08J 3/00-3/28 C08L 1/00-101/00

Claims (1)

(57) [Claims] In producing a resin composition containing (A) at least one selected from aromatic polycarbonates, polyarylates and polyester carbonates and (B) polyamide, first, the component (A) is used. Is melted or melt-kneaded, and the required amount of the component (B) is added to the molten component (A) once or in two or more portions, and the component (B) relative to the total residence time is added. Melt kneading so that the ratio of the residence time of the resin composition becomes 0.05 to 0.8.