JPH06122813A - Resin composition - Google Patents

Abstract

PURPOSE:To obtain a resin composition suitable for various kinds of molded articles and optical devices, having excellent transparency, greatly reduced birefringence, excellent mechanical properties and moldability by blending a polycarbonate with an amino group-containing vinyl-based polymer in a molten state. CONSTITUTION:(A) 10-100 pts.wt. polycarbonate, preferably consisting of bisphenol A and carbonate, having 5,000-100,000 number-average molecular weight and (B) 10-100 pts. wt. vinyl-based polymer containing 10 equivalent/10<6>g or more amino group in the ends or in the main chain obtained by polymerizing a vinyl-based monomer by using an amino group-containing initiator or by copolymerizing an amino group-containing monomer with a vinyl-based monomer or by chemically modifying a specific vinyl-based polymer are dried preferably before melting and blending to hold down water content to 0.5wt.% or less, blended in a molten state at a temperature 50 deg.C higher than the glass transition temperature of the component A or the component B to give the objective resin composition. 0ptionally, this resin composition is further mixed with an ester exchange catalyst and a phosphorus compound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition comprising a polycarbonate and a vinyl polymer, and more specifically, it comprises a polycarbonate and a vinyl polymer modified with an amino group, and is excellent in transparency and The present invention relates to a resin composition having a significantly reduced refractive index and excellent mechanical properties and moldability.

[0002]

2. Description of the Related Art A resin composition comprising a polycarbonate and a vinyl polymer is known. In particular, a resin composition composed of polycarbonate and polystyrene can theoretically have a birefringence of zero (Takashi Inoue, Taku Saito: Functional Material, P21, March 1987 issue). It is expected to be applied to equipment. However, since the compatibility between polycarbonate and polystyrene is poor, there is a problem in that the composition obtained by simply blending the composition impairs transparency, and the effect of reducing the birefringence is not recognized, and the mechanical properties are also greatly reduced. . For example, Japanese Patent Application Laid-Open No. 61-108617 discloses a resin composition containing a polycarbonate having a positive polarizability and a polystyrene having a negative polarizability, but the above problem has not been solved.

In order to solve such a problem, there has been proposed an attempt to chemically modify either a polycarbonate or a vinyl-based polymer to increase the compatibility to obtain a resin composition. For example, Japanese Patent Application Laid-Open No. 19656/1986 discloses a resin composition containing 5 to 50% by weight of a styrene resin obtained by copolymerizing a polycarbonate with an unsaturated carboxylic acid. Further, JP-A-63-27555, JP-A-63-56556 and JP-A-63-6.
Japanese Patent No. 6255 discloses a resin composition containing 3 to 50% by weight of a styrene polymer in a copolycarbonate. Further, JP-A-63-122749 discloses a resin composition in which a copolymer of styrene and maleic anhydride is added to polycarbonate. However, even in these resin compositions, the effect of improving the compatibility is insufficient, and the above problems still remain.

On the other hand, a resin composition in which a polycarbonate and a vinyl polymer are chemically bonded is also disclosed. For example, Japanese Patent Application Laid-Open No. 61-19630 discloses a polycarbonate in which 5 to 40% by weight of polystyrene is chemically bonded. Also, JP-A-62-20524
The publication discloses a polycarbonate in which a styrene copolymer is chemically bonded. These resin compositions are block or graft copolymers prepared by polymerizing the monomers constituting the other polymer from the active end of one polymer which has been previously polymerized. It can be said that this resin composition utilizes a chemical reaction between a macromer and a monomer. However, in the production of this resin composition, a homopolymer consisting only of the monomer is inevitable because the reaction between the monomers takes place stochastically over the reaction between the macromer and the monomer. There is a problem in that it is formed and the amount thereof is overwhelmingly larger than the desired block or graft copolymer. Therefore, it cannot be said that these resin compositions are also excellent in transparency, the birefringence is greatly reduced, and the mechanical properties and moldability are excellent.

As described above, in the conventional resin composition, although transparency is obtained, problems such as insufficient reduction in birefringence or poor mechanical properties and moldability occur on the other hand. It was Therefore, a resin composition comprising a polycarbonate and a vinyl-based polymer, which is excellent in transparency, has a significantly reduced birefringence, and has excellent mechanical properties and moldability, is expected to be applied to optical devices. However, a resin composition having sufficient properties has not been proposed yet, but it is the actual situation.

[0006]

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a polycarbonate and a vinyl having excellent transparency, a significantly reduced birefringence, and excellent mechanical properties and moldability. It is to provide a resin composition comprising a base polymer. Another object of the present invention is to provide a resin composition suitable for optical devices such as optical discs, optical fibers, optical card protective films and lenses, as well as general molded products.

[0007]

Means for Solving the Problems As a result of intensive studies to solve such problems, the present inventors have melt-kneaded a polycarbonate and a specific vinyl polymer having an amino group at a specific compounding ratio. The resin composition thus obtained was found to be excellent in transparency, greatly reduced in birefringence, excellent in mechanical properties and moldability, and arrived at the present invention.

That is, the gist of the present invention is (a) 10 to 100 parts by weight of a polycarbonate, and (b) 10 to 100 parts by weight of a vinyl polymer containing at least 10 equivalents / 10 ⁶ g of an amino group in the terminal or main chain. Is a resin composition obtained by melt-kneading.

The polycarbonate used in the present invention is an aromatic polycarbonate obtained from bisphenols and carbonic acid. 2,2 as such bisphenols
-Bis (4-hydroxyphenyl) propane (bisphenol A), 1,1-bis (4-hydroxyphenyl)
-1-Phenylethane (bisphenol AP), hydroquinone, resorcinol, 4,4'-dihydroxybiphenyl, 1,1-bis (4-hydroxyphenyl) cyclohexane, 1,1-bis (4-hydroxyphenyl) -3,3 , 5-Trimethylcyclohexane, bis (4-hydroxyphenyl) methane, bis (4-hydroxyphenyl) ethane, bis (3,5-dimethyl-4-)
Hydroxyphenyl) methane, bis (3,5-diethyl-4-hydroxyphenyl) methane, 1,1-bis (3,5-dimethyl-4-hydroxyphenyl) ethane, 1,1-bis (3,5-diethyl) -4-hydroxyphenyl) ethane, 1,1-bis (3,5-dimethyl-
4-hydroxyphenyl) propane, 2,2-bis (3,5-dimethyl-4-hydroxyphenyl) propane, 1,1-bis (3,5-diethyl-4-hydroxyphenyl) propane, 2,2-bis (3,5-Diethyl-4-hydroxyphenyl) propane, 1,1-bis (3,5-dimethyl-4-hydroxyphenyl) butane, 2,2-bis (3,5-dimethyl-4-hydroxyphenyl) Butane, 1,1-bis (3,5-diethyl-
4-hydroxyphenyl) butane, 2,2-bis (3,3
5-diethyl-4-hydroxyphenyl) butane, 1,
1-bis (3,5-dimethyl-4-hydroxyphenyl) cyclohexane, 1,1-bis (3,5-diethyl-4-hydroxyphenyl) cyclohexane, bis (3,5-dimethyl-4-hydroxyphenyl) phenyl Methane, bis (3,5-diethyl-4-hydroxyphenyl) phenylmethane, 1,1-bis (3,5-dimethyl-4-hydroxyphenyl) -1-phenylethane, 1,1-bis (3,5) -Diethyl-4-hydroxyphenyl) -1-phenylethane, bis (3,5-dimethyl-4-hydroxy) diphenylmethane, bis (3,3
5-diethyl-4-hydroxy) diphenylmethane, bis (4-hydroxyphenyl) ether, bis (3,5)
-Dimethyl-4-hydroxyphenyl) ether, bis (3,5-diethyl-4-hydroxyphenyl) ether, bis (4-hydroxyphenyl) sulfide, bis (3,5-dimethyl-4-hydroxyphenyl) sulfide, bis (3,5-diethyl-4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) sulfone, bis (3,5-dimethyl-4-hydroxyphenyl) sulfone, bis (3,5-diethyl-4-)
Hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) ketone, bis (3,5-dimethyl-4-hydroxyphenyl) ketone, bis (3,5-diethyl-4)
-Hydroxyphenyl) ketone, 4,4'-dihydroxybiphenyl and the like can be mentioned, and these may be used alone or in combination. Of these, bisphenol A is most preferably used.

Polycarbonate can be produced by a melt polymerization method or an interfacial polymerization method. In the melt polymerization method, for example,
Polycarbonate is obtained by reacting diphenyl carbonate and bisphenols at high temperature under reduced pressure.
On the other hand, in the interfacial polymerization method, bisphenols are dissolved in an alkaline aqueous solution and mixed with an organic solvent incompatible with water while stirring,
A polycarbonate is obtained by blowing phosgene into this. The interfacial polymerization method makes it possible to obtain a polycarbonate that is less colored than the melt polymerization method.

The molecular weight of the polycarbonate used in the present invention is not particularly limited, but the number average molecular weight is 5,000.
It is preferably 100 to 100,000. If the number average molecular weight is less than 5,000, the mechanical performance of the resin composition tends to deteriorate, which is not preferable. On the other hand, if it exceeds 100,000, the moldability tends to decrease, which is not preferable. The molecular weight of the present invention is measured by gel permeation chromatography calibrated with monodisperse polystyrene.

The vinyl polymer used in the present invention has at least 10 equivalent / 10 amino groups in the terminal or main chain.
^It contains ⁶ g. More preferably at least 30
It is equivalent to 10 ⁶ g. 10 equivalents of amino group /
If it is less than 10 ⁶ g, it is difficult to obtain a transparent resin composition, which is not preferable. On the other hand, when the amino group exceeds 300 equivalents / 10 ⁶ g, gel may be generated during melt kneading, which is not preferable. The amount of amino groups contained in the vinyl polymer is obtained by dissolving the vinyl polymer in m-cresol,
It can be determined by titrating with p-toluenesulfonic acid using thymol blue as an indicator.

The number average molecular weight of this vinyl polymer is preferably 1,000 to 200,000. When the number average molecular weight is less than 1,000, the physical properties of the resin composition, especially the mechanical properties tend to deteriorate, which is not preferable. On the other hand, when it exceeds 200,000, not only the moldability of the resin composition is lowered, but also its transparency is lowered and the birefringence is increased, which is not preferable. The molecular weight was measured by gel permeation chromatography as in the case of polycarbonate.

As the vinyl-based monomer constituting the vinyl-based polymer, other than styrene, for example, o-, m-, p-
Methylstyrene, o-, m-, p-ethylstyrene, p
Alkyl styrenes such as -tert-butyl styrene, halogenated styrenes such as o-, m-, p-chlorostyrene, dichlorostyrene, o-, m-, p-bromostyrene, dibromostyrene and α-methyl Styrene and the like, and mixtures thereof. These vinyl-based polymers are used for improving the physical properties of 0 to 50 mol% of other vinyl monomers such as methacrylic acid esters, acrylic acid esters, vinyl acetate, butadiene, acrylonitrile, acrylic acid, methacrylic acid and maleic anhydride. Etc. can be copolymerized.

A general radical polymerization method can be used as a method for producing a vinyl polymer containing an amino group, but it is not limited to this, and an anionic polymerization method or a cationic polymerization method can also be appropriately used. For example, in the radical polymerization method, it is convenient to use an azo compound containing an amino group as an initiator because a vinyl polymer having an amino group at the terminal can be easily obtained. Also,
For example, it is easy to copolymerize a monomer having an unsaturated bond and an amino group such as a styrene monomer in which a part of hydrogen atoms of a benzene ring is substituted with an amino group, and a vinyl-based monomer represented by styrene. It is possible to obtain a vinyl polymer having an amino group in its main chain. Furthermore, a vinyl polymer having an amino group in its terminal or main chain can be obtained by chemically modifying the vinyl polymer once polymerized.

In any case, whether a vinyl-based monomer is polymerized using an initiator containing an amino group or a monomer containing an amino group and a vinyl-based monomer are copolymerized,
Alternatively, by chemically modifying a specific vinyl polymer, a vinyl polymer having an amino group at the terminal or main chain can be obtained. In the present invention, the amino group contained in the main chain means an amino group chemically bonded to the vinyl polymer except at the polymer terminal.

In the present invention, (a) 10 to 100 parts by weight of the polycarbonate and (b) 10 to 100 parts by weight of a vinyl polymer containing at least 10 equivalents / 10 ⁶ g of amino groups in the terminal or main chain. Melt kneading to obtain a resin composition. When the amount of the component (a) is less than 10 parts by weight, not only the heat resistance of the resin composition is lowered, but also the impact strength and the mechanical strength are lowered. On the other hand, if the amount of the component (a) exceeds 100 parts by weight, the moldability of the resin composition will decrease. Similarly, when the amount of the component (b) is less than 10 parts by weight, the moldability is lowered. Further, when the amount of the component (b) exceeds 100 parts by weight, not only the heat resistance of the resin composition is lowered, but also the impact strength and the mechanical strength are lowered. Further, when the components (a) and (b) both deviate from this blending ratio, the birefringence increases.

At the time of melt-kneading, it is possible to carry out melt-kneading using a general reaction can, an extruder, an injection molding machine or the like. In general, the polycarbonate of (a) is also (b)
The specific vinyl polymer of the component is also amorphous, and in this case, the melt-kneading temperature is preferably at least 50 ° C. higher than the glass transition temperature of both the components (a) and (b). In any case, if the temperature exceeds 350 ° C., the resin composition may be decomposed, which is not preferable.

The melt-kneading time is preferably at least 1 minute, more preferably 2 minutes or more. If the melt-kneading time is too short, the resulting resin composition may be opaque or may not exhibit satisfactory physical properties, which is not preferable.

In the present invention, the polycarbonate as the component (a) and the vinyl polymer having the terminal or the main chain of the component (b) containing at least 10 equivalents / 10 ⁶ g of amino groups in the component (b) should be sufficiently dried before melt-kneading. Is preferably excluded. If necessary, the extruder may be provided with a vent port for simultaneous dehydration during melt-kneading. It is preferable to melt-knead while controlling the water content to 0.5% by weight or less based on the weight of the resin composition. When melt-kneading is performed at a water content of more than 0.5% by weight, the polycarbonate constituting the resin composition is significantly hydrolyzed, and a resin composition having satisfactory physical properties may not be obtained.

In the present invention, a transesterification catalyst may be further added for production, if necessary. In this case, a transparent resin composition can be obtained more easily. However, the resin composition produced by adding the transesterification catalyst,
Since decomposition may occur later in a hot melt molding process such as injection molding, it is also preferable to further use a phosphorus compound together in order to prevent the decomposition.

As the ester polymerization catalyst used as necessary in the present invention, known general polyester polymerization catalysts can be used. Specific examples of such a catalyst include Na, Mg, Zn, Cd, Ti, Ge, Pb and S.
Examples thereof include metal acetates such as b and Sn, alkoxides, hydroxides, oxides, halides, sulfates, carbonates, phosphates, and acidic compounds such as p-toluenesulfonic acid.

Examples of the phosphorus compound used as necessary in the present invention include orthophosphoric acid, phosphonic acid, orthophosphoric acid ester and phosphorous acid ester, and of these, phosphorous acid ester is most preferably used. Examples of these phosphites include alkyl phosphites, aryl phosphites, alkyl aryl phosphites, diphosphites, polyphosphites, thiophosphites, and the like. Stearyl phosphite, triisodecyl phosphite, triisooctyl phosphite, trilauryl phosphite, tristearyl phosphite,
Diphenylphosphite, trisnonylphenylphosphite, triphenylphosphite, diphenylisodecylphosphite, diphenylisooctylphosphite, phenyldiisodecylphosphite, diisodecylpentaerythritol diphosphite, tetraphenyldipropyleneglycol diphosphite, poly ( Examples include dipropylene glycol) phenyl phosphite, trilauryl thiophosphite, tetrakis (2,4-ditertiarybutylphenyl) -4,4′-biphenylene diphosphite, and the like.

The amount of the transesterification catalyst to be used, if necessary, is generally 0.00001 to 0.1 part by weight per 100 parts by weight of the resin composition. Similarly, the general compounding amount of the phosphorus compound, which is also used if necessary, is preferably 0.0001 to 3 parts by weight with respect to 100 parts by weight of the resin composition.

In the present invention, a heat stabilizer, an antioxidant, a weathering agent, a flame retardant, a plasticizer, a release agent, a colorant, a reinforcing material, etc. are added unless the characteristics of the resin composition are significantly impaired. Is also possible. Examples of such heat stabilizers and antioxidants include hindered phenols, hindered amines, sulfur compounds, copper compounds, and mixtures thereof. Examples of the reinforcing material include clay, talc, calcium carbonate, zinc carbonate, wollastonite, silica, alumina, magnesium oxide, calcium silicate, asbestos, sodium aluminate, calcium aluminate, sodium aluminosilicate, magnesium silicate, and water. Aluminum oxide, calcium hydroxide, barium sulfate, potassium alum, sodium alum, iron alum, glass balloon, carbon black, zinc oxide, antimony trioxide, boric acid, borax, zinc borate, zeolite, hydrotalcite, metal Examples thereof include fibers, metal whiskers, ceramic whiskers, potassium titanate, ticker boron, mica, graphite, glass fibers and carbon fibers.

Additives such as these heat stabilizers, antioxidants, weather resistance agents, flame retardants, plasticizers, release agents, colorants and reinforcing agents are generally preferably added at the time of melt kneading. Further, it is possible to blend other polymers if necessary. Examples of such a polymer include polybutadiene, butadiene-styrene copolymer, acrylic rubber, ethylene-
Elastomers such as propylene copolymer, ethylene-propylene-diene copolymer, natural rubber, chlorinated butyl rubber, chlorinated polyethylene, styrene-butadiene block copolymer, butadiene-styrene radial tereblock copolymer, styrene-maleic anhydride Acid copolymer, styrene-phenylmaleimide copolymer, polyethylene, polypropylene, butadiene-acrylonitrile copolymer, polyvinyl chloride, polyethylene terephthalate, polybutylene terephthalate, polyacetal, polyvinylidene fluoride, polysulfone, polyphenylene sulfide, polyether sulfone, Phenoxy resin, polyphenylene ether, polymethylmethacrylate, polyetherketone, polyamide, polyarylate, polytetrafluoroethylene Etc., and the like.

The resin composition of the present invention can be made into a desired molded article by a usual molding processing method. For example, hot-melt molding methods such as injection molding, extrusion molding, blow molding, and sintering molding can be applied. Alternatively, a thin film can be formed from an organic solvent solution by a casting method.

Since the resin composition of the present invention is excellent in transparency, has a greatly reduced birefringence, and is excellent in mechanical properties and moldability, various molded products, films, sheets, optical disks, It is also suitably used for optical applications such as optical fibers, optical guard protective films, and lenses.

[0029]

The resin composition of the present invention is a resin composition obtained by melt-kneading a polycarbonate and a specific vinyl polymer, that is, a vinyl polymer having an amino group,
It has excellent transparency that has been conventionally desired, has a significantly reduced birefringence, and has excellent mechanical properties and moldability. However, the conventional resin composition is a resin composition obtained by simply melt-kneading a polycarbonate and a general vinyl polymer, and has poor transparency, high birefringence, and poor mechanical properties. The reason for this is considered that in the resin composition of the present invention, some chemical reaction occurs between the amino group contained in the vinyl polymer and the polycarbonate during melt kneading. The fact suggesting that a chemical reaction is occurring may be the amount of cyclohexane extracted from the resin composition, and when the resin composition of the present invention is extracted with cyclohexane, the extracted amount is particularly small. On the other hand, when a conventional resin composition obtained by melt-kneading a polycarbonate and a general vinyl polymer is extracted with cyclohexane, the extraction amount is large. Thus, it is considered that the resin composition of the present invention undergoes a chemical reaction between the polycarbonate and the vinyl-based polymer,
Therefore, it is considered to be excellent in transparency, have a greatly reduced birefringence, and have excellent mechanical properties and moldability.

Further, since the resin composition of the present invention can be produced simply by melt-kneading, the time required for obtaining the resin composition obtained by the reaction of the macromer and the monomer is larger than that of the present invention. The time required to obtain the resin composition is extremely short. Moreover, the content of the block or graft copolymer composed of the polycarbonate and the vinyl polymer in the resin composition is high.

[0031]

EXAMPLES Next, the present invention will be specifically described with reference to Examples.
In the examples and comparative examples, performance evaluation was performed by the following method. (1) Extraction amount of cyclohexane Using 50 parts by weight of cyclohexane per 1 part by weight of the resin composition, extraction was performed for 26 hours using a Soxhlet extractor. The polycarbonate simple substance is not extracted with cyclohexane, but the vinyl polymer simple substance is extracted with this. The amount of cyclohexane extracted from the resin composition was evaluated by dividing the weight of the extracted resin by the weight of the raw material vinyl polymer constituting the resin composition (indicated by%).

(2) Light transmittance The pellets of the resin composition were vacuum dried at 80 ° C. for 16 hours, and then injection-molded at a cylinder temperature of 260 ° C. and a mold temperature of 80 ° C., and a test with a side of 5 cm and a thickness of 3 mm. Created a piece. As a molding machine, a 125/75 MST type molding machine manufactured by Mitsubishi Heavy Industries, Ltd. was used. However, in Comparative Example 2, only the cylinder temperature was changed to 280 ° C, and in Comparative Example 3, the temperature was changed to 220 ° C and molding was performed. Using this test piece, the total light transmittance was measured based on ASTM D1003. Measured by Nippon Denshoku S
The measurement was carried out using a Z-Σ80 colorimeter.

(3) Birefringence The resin composition is dissolved in methylene chloride to prepare a 20% by weight solution, and an automatic film a manufactured by Yasuda Seiki Co., Ltd. is prepared.
A film having a thickness of 100 μm was prepared by using plicator No542-AB-S. The film is 12
Left at room temperature for 12 hours and then in a vacuum dryer at 100 ℃ for 12 hours.
The solvent was removed by drying for an hour. Using the hot air circulating uniaxial stretching device manufactured by Satake Chemical Machinery Co., Ltd.
The film was stretched by 50% at 50 ° C. and the birefringence of the film was measured by an optical-pol polarizing microscope (wavelength 546n manufactured by Nikon Corporation)
m).

(4) Bending strength and flexural modulus Injection molding was carried out in the same manner as in the measurement of light transmittance.
A 1/8 inch bending test piece was prepared. The flexural strength and flexural modulus of the obtained test piece were measured based on ASTM D790.

(5) Izod impact test An Izod impact test was conducted using the above test piece. The measurement was performed based on ASTM D256.

(6) Deflection temperature under heat load (HDT) The deflection temperature under heat load (HDT) was measured using the above test piece. The measurement was performed based on ASTM D648. The load was 18.6 kg / cm ² .

Reference Example 1 [Vinyl polymer having amino groups at the ends (S1, S
Synthesis Example of 2)] 2,2′-azobis (2-amidinopropane) dihydrochloride was used as an initiator, and styrene was bulk polymerized at 90 ° C. for 20 hours, and the reaction product was put into methanol to prepare polystyrene. Was isolated by precipitation. The isolated polystyrene was thoroughly washed with methanol and then vacuum dried. By changing the amount of the initiator added, vinyl polymers (S1 and S2) having two types of terminal amino groups were obtained. The molecular weight and amino group content of S1 and S2 were measured. The molecular weight is measured by Toyo Soda Co., Ltd. GP
The gel permeation chromatography was performed using a C measuring device HLC-802A and using tetrahydrofuran as a solvent and calibrated with monodisperse polystyrene. The amino group was measured by dissolving it in m-cresol and titrating with p-toluenesulfonic acid using thymol blue as an indicator. These measured values are listed in Table 1.

Reference Example 2 [Vinyl-based polymer having amino groups in its main chain (S3, S
Synthesis Example of 4)] Using benzoyl peroxide as a polymerization initiator, 100 parts by weight of styrene and 9 parts of p-aminostyrene are used.
Bulk polymerization was carried out at 0 ° C. for 20 hours, the reaction product was put into methanol, and polystyrene was isolated by precipitation. The isolated polystyrene was thoroughly washed with methanol and then vacuum dried. By changing the amount of p-aminostyrene added, two types of vinyl-based polymers (S3, S4) having amino groups at their ends were obtained. The molecular weight and amino group content of S3 and S4 were measured in the same manner as in Reference Example 1. Table 1 shows the measured molecular weights and amino group values.

Reference Example 3 [Synthesis example of vinyl polymer having no amino group (S5)] Vinyl polymer having no amino group by radical polymerization at 90 ° C. for 20 hours using benzoyl peroxide as a polymerization initiator. A polymer (S5) was obtained. The molecular weight and amino group were determined in the same manner as in Reference Example 1. The results are listed in Table 1.

[0040]

[Table 1]

Examples 1 to 10 and Comparative Examples 1 to 9 Raw materials having the formulations shown in Tables 2 to 5 were vacuum dried at 120 ° C. for 16 hours, and then a twin-screw extruder (PCM45, manufactured by Ikegai Steel Co., Ltd.) was used. The mixture was melt-kneaded at a cylinder temperature of 260 ° C., extruded, and cut into pellets. In each case, good pelletization was possible. In this case, the average residence time of the resin composition in the cylinder of the extruder was 3 minutes and 40 seconds. When melt-kneading, use the vent port of the cylinder to
The pressure was reduced to mmHg or less. Various test pieces were obtained using the pellets of the obtained resin composition, and various performance evaluations shown in Tables 2 and 3 were performed. The results are also shown in Tables 2 to 5.

The polycarbonate used in the examples and comparative examples had a number average molecular weight of 30,000 consisting of bisphenol A and carbonic acid (Mitsubishi Gas Chemical Co., Inc., Iupilon 1000) and a number average molecular weight of 20,000 ( Mitsubishi Gas Chemical Co., Inc., Iupilon 3000), and the vinyl polymer used was S1 to S5 listed in the reference example.

[0043]

[Table 2]

[0044]

[Table 3]

[0045]

[Table 4]

[0046]

[Table 5]

[0047]

The resin composition of the present invention has excellent transparency,
In addition, the birefringence is greatly reduced, and it has excellent mechanical properties and moldability. Therefore, the resin composition of the present invention can be suitably used for various molded products, films and sheets, as well as optical devices such as optical discs, optical fibers, optical card protective films and lenses, depending on its characteristics.

Front Page Continuation (72) Inventor Shinichiro Katahira 23 Uji Kozakura, Uji City, Kyoto Prefecture Unitika Central Research Company Central Research Laboratory (72) Inventor Miwako Watanabe 23 Uji Kozakura Uji City Kyoto Prefecture Unitika Stock Company Central Research Center

Claims (1)

[Claims] 1. A vinyl polymer 10 to 10 containing (a) 10 to 100 parts by weight of a polycarbonate and (b) at least 10 equivalents / 10 ⁶ g of an amino group in the terminal or main chain.
A resin composition obtained by melt-kneading with 0 part by weight.