JP2692019B2 - Thermoplastic resin composition excellent in plating property, impact resistance and large-scale moldability - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic resin excellent in plating property, impact resistance and large-scale moldability.

[0002]

2. Description of the Related Art As a thermoplastic resin having excellent impact resistance,
At present, rubber modified thermoplastic resins represented by ABS resin and high impact polystyrene are widely used. These thermoplastic resin molded products may be used as the molded products themselves or may be used after being subjected to secondary processing represented by coating plating etc. after molding. In the latter case, the ratio is considerably high. The current situation. In addition, plating, which is one of the secondary processes, has recently adopted quite severe plating conditions in order to achieve a high cycle and improve the yield.

Particularly, in the plating process, the temperature at which a so-called etching process for melting a rubber portion is performed is becoming higher. When etching is performed at such a high temperature, in the conventional rubber-modified thermoplastic resin molded product,
The octopus-shaped clean holes formed after melting the rubber are not opened on the resin surface, and the holes are joined together or the holes are crushed and the surface layer becomes rough. Therefore, the anchor effect is lowered, the adhesion strength at the interface between the resin surface and the plated metal film is lowered, and problems such as swelling occur.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention An object of the present invention is to solve the above problems in plating and to provide an impact resistant thermoplastic resin suitable for molding a large-sized molded product.

[0005]

DISCLOSURE OF THE INVENTION As a result of intensive studies made by the present inventors in view of the above situation, the present inventors have conducted a graft polymerization of a monomer mixture having a specific particle size distribution with a monomer mixture under specific reaction conditions. It is known that the impact-resistant thermoplastic resin composition containing the graft polymer thus prepared is particularly excellent in plating property and also has good large-scale moldability, and that the graft copolymer-containing thermoplastic resin composition has a specific structure. It was found that these properties can be further improved by blending the organosilicon compound with, and the present invention has been completed.

That is, according to the first aspect of the present invention, the rubber having an average particle diameter of 0.35 to 0.5 μm is contained in an amount of 5 to 30% by weight (as solid content), and the rubber having an average particle diameter of 0.2 to 0.32 μm is used.
Of 70 to 70% by weight (as solid content) and 0 to 15% by weight (as solid content) of a rubber having a particle diameter of 0.10 μm or less (as solid content), 5 to 70 parts by weight (as solid content) of a rubber latex having a polydisperse particle size distribution. Aromatic vinyl monomer 60-90 in the presence of
95 to 30 parts by weight of a monomer mixture consisting of 10 to 40% by weight of vinyl cyanide monomer and 0 to 20% by weight of at least one monovinyl monomer copolymerizable therewith, at a polymerization initiation temperature. At 40 to 50 ° C., 1.2 to 1.5 parts by weight / min of total amount was added dropwise to the reaction initiator to prepare a reaction initiator.
10 to 0.20 parts by weight, peak temperature of polymerization system 60 to 80
A thermoplastic resin composition containing a graft rubber as a main component, which is obtained by emulsion polymerization under a reaction condition of ° C, and has excellent plating properties, impact resistance, and large-scale moldability.

The rubber latex in the present invention is 1,3
- those constituted from butadiene 100-50% by weight and the monomer 0-50% by weight having a copolymerizable therewith CH ₂ = C <group (total 100 wt%), i.e., 1,
It is a 3-polybutadiene homopolymer or a copolymer composed of 50% by weight or more of 1,3-butadiene unit.
Examples of the copolymer include a butadiene-aromatic vinyl compound copolymer such as a butadiene-styrene copolymer and a butadiene-vinyltoluene copolymer; a butadiene-acrylonitrile copolymer; a butadiene-methacrytonitrile. Copolymer; butadiene-alkyl acrylate such as butadiene-methyl acrylate copolymer, butadiene-ethyl acrylate copolymer, butadiene-butyl acrylate copolymer, butadiene-2-ethylhexyl acrylate copolymer, etc. Ester copolymers;
A butadiene-methyl methacrylate copolymer, a butadiene-ethyl methacrylate copolymer or the like; a butadiene-methacrylic acid alkyl ester copolymer; and the like, further comprising 50% by weight or more of 1,3-butadiene units. Tertiary copolymers can also be used.

These can usually be easily produced by a known emulsion polymerization. The catalyst, emulsifier, etc. used for the production of this diene rubber are not particularly limited, and various kinds can be used. It is necessary that the rubber particles have a two-dispersion particle size distribution of large particles and medium particles. The average particle diameter of the large particles is 0.35 to 0.5 μm, and the average particle diameter of the medium particles is 0. It is 2 to 0.32 μm, and the ratio of large particles to medium particles is in the range of 5 to 30/95 to 70 (% by weight). If the average particle size of the large particles exceeds 0.5 μm, the impact resistance is greatly reduced, and if it is less than 0.35 μm, the effect of improving the plating property is reduced. The average particle size of the medium particles is 0.
If it exceeds 32 μm, the impact resistance decreases, and if it is less than 0.2 μm, the impact resistance decreases, and at the same time, the effect of improving the plating property also decreases. Further, the rubber having a particle diameter of 0.1 μm or less is 0 to 15% by weight, and if it exceeds 15% by weight, both plating properties and physical properties tend to be deteriorated.

Regarding the ratio of large particles / medium particles, when the ratio of large particles in the rubber is lower than 5% by weight, the effect of improving the plating property and large-sized moldability is lowered, and when it exceeds 30% by weight, impact resistance is increased. Sex decreases. Also, there is no particular limitation as to the method of providing a particle size distribution, each particle is manufactured individually,
Examples thereof include a method of blending them at a predetermined ratio, and a method of enlarging a small particle rubber by using a blend system of acid group-containing copolymers having different swelling capacities and having a particle size distribution all at once.

As the aromatic vinyl monomer in the present invention, styrene, α-methylstyrene, vinyltoluene,
Tert-butylstyrene and the like can be mentioned as a typical example, and they can be used alone or in combination of two or more, but styrene is preferably used. Examples of the vinyl cyanide monomer include acrylonitrile, methacrylonitrile, ethacrylonitrile, etc.
A mixture of one or more kinds can be used, but acrylonitrile is preferably used. Examples of vinyl monomers copolymerizable with them include methyl methacrylate, alkyl methacrylates such as ethyl methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate, etc., which may be used alone or in combination of two or more. Can be used.

The polymerization is an emulsion polymerization method, and the reaction conditions are as follows.
The polymerization initiation temperature is 40 to 50 ° C., and the monomer mixture is charged in such a manner that the total amount is dropped at a dropping rate of 1.2 to 1.5 parts by weight / minute. The amount of the reaction initiator is 0.10 to 0.20 parts by weight, and organic peroxide is preferably used as the kind of the reaction initiator. Further, as the reaction profile, it is necessary to set the peak temperature of the polymerization in the range of 60 to 80 ° C. That is, this polymerization formulation is characterized by low temperature initiation, low initiator amount, high-speed monomer dropping, and slowing down the reaction initiation rate to reduce the grafting points and the grafting inside the rubber as much as possible. . The graft ratio of the graft rubber is preferably 25 to 70%. The polymerization regulator used is preferably tert-dodecyl mercaptan. When the polymerization initiation temperature, the monomer dropping rate, and the polymerization peak temperature deviate from the above ranges, the graft structure deviates from the desirable structure shown above, and the plating property and the impact resistance decrease.

The graft rubber produced as described above is used as it is, if necessary, with various coloring agents such as dyes and pigments,
Stabilizers against light or heat, inorganic or organic particles,
Although it can be used as a thermoplastic resin composition for molding by adding a powdery or fibrous filler, a foaming agent, etc., a thermoplastic resin composition for molding by mixing with a hard thermoplastic resin produced separately It can also be used as a thing. The hard thermoplastic resin may be used without particular limitation as long as it is hard at room temperature, for example, aromatic vinyl compound-acrylonitrile copolymer, aromatic vinyl compound-acrylonitrile-methyl methacrylate ternary copolymer. Polymer, aromatic vinyl compound-acrylonitrile-lower alkyl acrylate terpolymer, acrylonitrile-lower alkyl acrylate copolymer acrylonitrile-α
-Methylastyrene binary common polymer, styrene-acrylonitotyl-N-phenylmaleimide terpolymer, polycarbonate and the like are exemplified as preferable ones. Further, the thermoplastic resin composition of the present invention is molded by various molding methods such as injection molding and extrusion molding.

According to a second aspect of the present invention, the thermoplastic resin composition according to the first aspect described above is blended with a specific organosilicon compound to improve its impact resistance, plating characteristics and large-scale moldability. It is further improved and is as follows. That is, the organosiloxane represented by the general formula 1,

[0014]

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(In the formula, R ^{1 to} R ⁴ each independently represent an alkyl group or an allyl group having 1 to 8 carbon atoms, and m represents an integer of 1 or more.) Silane compound represented by the general formula 2 ,

[0016]

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(Wherein R ^{1 to} R ⁴ each independently represents an alkyl group or an allyl group having 1 to 8 carbon atoms) and an organohalosilane represented by the general formula 3.

[0018]

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(Wherein R ⁵ is an alkyl group or an allyl group having 1 to 8 carbon atoms, Y is a halogen, and n is 1 to 3),
The thermoplastic resin composition according to claim 1, which comprises 0.01 part by weight or more and 15 parts by weight or less based on 100 parts by weight of the total amount of the thermoplastic resin and is excellent in plating property, impact resistance and large-scale moldability. .

The organosilicon compound used in the present invention is represented by the general formulas 1, 2, and 3, specifically, for example, polydimethylsiloxane, polymethylethylsiloxane, polydiethylsiloxane and polydiethylsiloxane. Examples include organosiloxanes such as methylphenylsiloxane, silanes such as tetraethylsilane and trimethylhexylsilane, and halosilanes such as triethylchlorosilane, diethyldichlorosilane, phenyltrichlorosilane, and diphenyldichlorosilane.

In using these organosilicon compounds, it is necessary that they have a boiling point of 120 ° C. or higher and are thermally and chemically stable in the molding temperature range of the resin composition. As an example of what this condition is met,
The polysiloxane has a viscosity of 0.2 to 500,000 centistokes, preferably 50,000 to 50,000 centistokes. When the organosilicon compound is used, the above-mentioned ones may be used alone, but two or more kinds may be combined if necessary.

The amount of the organosilicon compound added to the thermoplastic resin composition is 100 parts by weight, which is the total amount of all the resins in the composition, that is, the graft rubber and the other thermoplastic resin which is optionally added. On the other hand, it is 0.01 part by weight or more and 15 parts by weight or less, preferably 0.01 part by weight or more and 10 parts by weight or less. If it is less than 0.01 part by weight, the impact resistance is lowered.
As a method of compounding with the thermoplastic resin composition, compounding with resin latex has little effect and blending with resin powder is preferred.

[0023]

The present invention will be described in more detail with reference to the following examples, which should not be construed as limiting the present invention. In the examples and comparative examples, "part" represents "part by weight", and various physical properties were measured by the following methods.

(1) Latex particle size (unit: μm) A water-diluted solution of rubber latex was measured using a measuring device (DLS-700) manufactured by Otsuka Electronics Co., Ltd., which operates on the principle of light scattering. (2) Izod impact strength (unit: Kg · cm / cm)
Was measured according to ASTM D-256. (3) Melt flow index (MI, unit: g / 1
For 0 minutes), the extruded pellets were melted using a melt indexer manufactured by Toyo Baldwin Co., Ltd. according to ASTM D-1238.
(200 ° C., load 5 Kg).

(4) The adhesion strength (unit: Kg / cm) is
In the normal ABS plating process shown below, the Heisei-shaped plate for plating is plated, used as a sample, and the pulling force when the plated film is peeled from the molded plate by pulling it vertically on the load measuring device. Is the value measured. Degreasing (60 ° C, 3 minutes) ↓ Washing with water ↓ Etching (CrO ₃ : 400 g / 1, H ₂ SO ₄ : 200 cc / 1,70 ° C, ↓ 20 minutes) Washing with water ↓ Pickling (room temperature, 1 minute) ↓ Washing ↓ Catalyst Chemical treatment (25 ° C, 3 minutes) ↓ Washing with water ↓ Activation treatment (40 ° C, 5 minutes) ↓ Washing with water ↓ Chemical nickel plating (40 ° C, 5 minutes) ↓ Electro copper plating (film thickness 35 μm, 20 ° C, 60 minutes) ↓ Drying (80 ℃, 120 minutes)

(5) Hardness (Rockwell method) is AST
It was measured by MD-785.

Examples 1, 2, 3, 4 and 5 Synthesis of rubber (A-1) latex 1,3-butadiene 66 parts n-butyl acrylate 9 parts styrene 25 parts diisopropylbenzene hydroperoxide 0.2 parts Potassium oleate 1.0 part Disproportionated potassium rosinate 1.0 part Sodium pyrophosphate 0.5 part Ferrous sulfate 0.005 part Dextrose 0.3 part Anhydrous sodium sulfate 0.3 part Water 200 Parts 50 according to the above composition at 100 liter autoclave
Polymerized at ° C. Polymerization was almost completed in 9 hours and the conversion rate was 97.
%, An average particle diameter of 0.08 μm, and a pH 9.0 9.0 diene rubber latex were obtained.

Synthesis of Acid Group-Containing Copolymer (BS-1) for Enlargement of Rubber Particles n-Butyl acrylate 85 parts Methacrylic acid 15 parts Potassium oleate 2 parts Dioctyl sulfosuccinate soda 1 part Cumene hydroperoxide 0. 4 parts Sodium formaldehyde sulfoxylate 0.3 parts Ion-exchanged water 200 parts The above composition was polymerized at 70 ° C. for 4 hours in another polymerization apparatus. The conversion was 98%, and an acid group-containing copolymer latex having an average particle diameter of 0.08 μm was obtained.

Acid group-containing copolymer (BB for enlarging rubber particles)
-1) Synthesis The same method as in the synthesis of the acid group-containing copolymer (BS-1) except that the amount of n-butyl acrylate was changed to 72 parts and the amount of methacrylic acid was changed to 28 parts. Was repeatedly polymerized. The conversion rate is 97% and the average particle size is 0.1.
A 0 μm acid group-containing copolymer latex was obtained.

Polydisperse Particle Size Distribution Rubber Latex (C-1)
Production of rubber (A-1) latex 100 parts (as solid content)
2 parts of a mixed latex of an acid group-containing copolymer for rubber particle enlargement (BS-1 / BB-1 = 80/20, solid content ratio) was added with stirring, and the mixture was further stirred for 30 minutes to obtain polydispersed particles. A rubber latex having a size distribution was obtained. Table 1 shows the measurement results of the particle size distribution of this latex.

Production of graft rubber latex (D-1) Polydisperse particle size distribution latex (C-1) 15 parts Styrene 67 parts Acrylonitrile 18 parts Cumene hydroperoxide 0.12 parts Disproportionated potassium rosinate 2. 0 part Sodium pyrophosphate 0.2 part Ferrous sulfate 0.01 part Dextrose 0.35 part Water 200 parts With the above composition, polymerization initiation temperature 40 ° C., monomer dropping rate 1.3 parts by weight Graft polymerization was carried out at a rate of 1 / min.

To the obtained polymer latex, 2 parts of butylated hydroxytoluene and 0.5 part of dilaurylthiopropionate were added as an antioxidant, coagulated with a 5% sulfuric acid aqueous solution, washed and dried. A white powder was obtained. 0.1 part of a phosphite stabilizer was added to this, and after mixing with a Henschel mixer for 5 minutes (3000 rpm), the mixture was extruded at a cylinder temperature of 230 ° C to form pellets, and then screw-type injection molding machine (cylinder temperature of 230 ° C, A mold for measuring physical properties and a flat plate for plating were molded using a mold temperature of 60 ° C. Then, the test piece and the flat plate were used to measure the physical properties and the adhesion strength of the plating. The results are shown in the column of Example 1 in Table 1. Table 1
Medium and unenlarged small particles (0.08 μm) are the rest of the sum of the ratio of large particles and the ratio of medium particles.

To the dried white powder, various organosilicon compounds were added in the amounts shown in Table 1, 0.1 part of a phosphite stabilizer was further added, and the mixture was mixed in a Henschel mixer for 5 minutes (3000 rpm). Then, it was extruded into pellets at a cylinder temperature of 230 ° C., and a screw-type injection molding machine (cylinder temperature: 230 ° C., mold temperature: 60 ° C.) was used to mold a sample for measuring physical properties and a flat plate for plating. Then, the test piece and the flat plate were used to measure the physical properties and the adhesion strength of the plating. The results are shown in Examples 2, 3, 4 and 5 of
Column.

Examples 6 and 7 In the production of the polydisperse particle size distribution rubber latex in Example 1, BS-of an acid group-containing copolymer for enlarging rubber particles was used.
The same procedure as in Example 1 was repeated except that the mixing ratio of 1 / BB-1 was changed to 7/93. The results are shown in the column of Example 6 in Table 1. The results obtained by adding the organosilicon compound are shown in the column of Example 7 in Table 1.

Examples 8 and 9 In the synthesis of the acid group-containing copolymer (BS-1) of Example 1, the amount of n-butyl acrylate was changed to 88 parts and the amount of methacrylic acid was changed to 12 parts. (BS-2), the same method as in Example 1 was repeated. The results are shown in the column of Example 8 in Table 1. The results obtained by adding the organosilicon compound are shown in the column of Example 9 in Table 1.

Examples 10 and 11 In the synthesis of the acid group-containing copolymer (BB-1) of Example 1, 65 parts of n-butyl acrylate and 3 parts of methacrylic acid were used.
The same method as in Example 1 was repeated by changing the amount to 5 parts (BB-2). The results are shown in the column of Example 10 in Table 1. The results obtained by adding the organosilicon compound are shown in Example 1 of Table 1.
This is shown in column 1.

[0037]

[Table 1]

Comparative Example 1 The same procedure as in Example 2 was repeated except that the organosilicon compound used in Example 2 was changed as shown in Table 2. The results are shown in the column of Comparative Example 1 in Table 2. Comparative Examples 2 and 3 In Example 1, the same method as in Example 1 was repeated using only the acid group-containing copolymer (BS-1). The results are shown in the column of Comparative Example 2 in Table 2. The results obtained when the organosilicon compound was added are shown in the column of Comparative Example 3 in Table 2.

Comparative Examples 4 and 5 In Example 1, the same procedure as in Example 1 was repeated using only the acid group-containing copolymer (BB-1).
The results are shown in the column of Comparative Example 4 in Table 2. The results obtained by adding the organosilicon compound are shown in the column of Comparative Example 5 in Table 2. Comparative Examples 6 and 7 In Example 1, the ratio of the acid group-containing copolymer (BS-1
/ BB-2) was changed to 60/40 and the same method as in Example 1 was repeated. The results are shown in the column of Comparative Example 6 in Table 2. Table 2 shows the results when an organosilicon compound was added.
The column of Comparative Example 7 is shown.

Comparative Examples 8 and 9 In Example 1, the ratio of the acid group-containing copolymer (BS-1
/ BB-2) was changed to 97/3, and the same method as in Example 1 was repeated. The results are shown in the column of Comparative Example 8 in Table 2. Table 2 shows the results when an organosilicon compound was added.
The column of Comparative Example 9 is shown. Comparative Examples 10 and 11 In the synthesis of the acid group-containing copolymer (BB-1) of Example 1, the amount of n-butyl acrylate was changed to 83 parts and the amount of methacrylic acid was changed to 17 parts (BB- 3) The same method as in Example 1 was repeated. The results are shown in Comparative Example 10 of Table 2.
Column. The results obtained by adding the organosilicon compound are shown in the column of Comparative Example 11 in Table 2.

Comparative Examples 12 and 13 In the synthesis of the acid group-containing polymer (BB-1) of Example 1, the amount of n-butyl acrylate was changed to 60 parts and the amount of methacrylic acid was changed to 40 parts (BB -4) and the same method as in Example 1 was repeated. The results are shown in the column of Comparative Example 12 in Table 2. The results obtained by adding the organosilicon compound are shown in the column of Comparative Example 13 in Table 2. Comparative Example 14 The same method as in Example 1 was repeated except that the amount of the acid group-containing copolymer used in Example 1 was 1 part. The results are shown in the column of Comparative Example 14 in Table 2.

Comparative Examples 15 and 16 In the production of the graft rubber latices of Examples 1 and 2, the same experiments and evaluations as in Examples 1 and 2 were carried out except that the polymerization initiation temperature was changed from 40 ° C to 60 ° C. . The results are shown in the columns of Comparative Examples 15 and 16 of Table 2, respectively. Comparative Examples 17 and 18 Examples 1 and 2 except that the monomer dropping rate during polymerization was changed from 1.3 parts by weight / min to 0.7 parts by weight in the production of the graft rubber latexes of Examples 1 and 2. Experiments and evaluations were performed in exactly the same manner as in. The results are shown in the columns of Comparative Examples 17 and 18 of Table 2, respectively. As seen in Comparative Examples 15 to 18, when the reaction conditions are out of the range of the present invention, the Rockwell hardness is lowered and the balance with the Izod impact strength is deteriorated.

[0043]

[Table 2]

Examples 12, 13, 14 and 15 Using the polydisperse particle size distribution latex (C-1) of Example 1, a graft rubber latex (D-2) was prepared with the following composition. The polydisperse particle size distribution latex (C-1) 30 parts Styrene 55 parts Acrylonitrile 15 parts Cumene hydroperoxide 0.12 parts Disproportionated potassium rosinate 2.0 parts Sodium pyrophosphate 0.2 parts Sulfuric acid No. 1 iron 0.01 part dextroze 0.35 part water 200 part

Graft polymerization was carried out at a polymerization initiation temperature of 40 ° C. and a monomer dropping rate of 1.3 parts by weight / minute. To the obtained polymer latex, 2 parts of butylated hydroxytoluene and 0.5 part of dilauryl thiopropionate were added as antioxidants, coagulated with 5% sulfuric acid aqueous solution, washed and dried to give a white powder. Obtained. 50 parts of this white powder and 0.1 part of phosphite stabilizer were mixed with AS resin [acrylonitrile-styrene copolymer, AN / ST = 21/79 (weight ratio), η
Table 3 shows sp / c = 0.62 dl / g (measured in DMF at 25 ° C.)], polycarbonate (product of Mitsubishi Gas Chemical Co., Inc., Upylon S-20000), and organosilicon compound. C. and after mixing for 5 minutes (3000 rpm) with a Henschel mixer.
The mixture was extruded into pellets at ℃, and a screw type injection molding machine (cylinder temperature: 230 ℃, mold temperature: 60 ℃) was used to mold a sample for measuring physical properties and a flat plate for plating. Then, the test piece and the flat plate were used to measure the physical properties and the adhesion strength of the plating. Table 3 shows the results.

[0046]

[Table 3]

[0047]

As described above, the thermoplastic resin composition of the present invention can be polymerized by low-temperature initiation, low initiator amount, high-speed monomer dropping, and by slowing the reaction initiation rate, the grafting point can be reduced. However, since it contains a graft rubber in which the graft inside the rubber is reduced as much as possible, not to mention impact resistance,
It has excellent plating characteristics and large moldability. These properties can be further improved by further adding a specific organosilicon compound.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C08L 83/04 C08L 83/04 // (C08F 279/02 212: 10) (C08F 285/00 212 :Ten)

Claims (2)

(57) [Claims] 1. Rubber 5 having an average particle size of 0.35 to 0.5 μm
30% by weight (as solid content), average particle size 0.2 to 0.3
Rubber latex 5 having a polydisperse particle size distribution of 95-70% by weight of rubber (as solids) of 2 μm and 0-15% by weight (as solids) of rubber with a particle size of 0.10 μm or less.
~ 70 parts by weight (as solids), 60-90% by weight of aromatic vinyl monomer, 10 vinyl cyanide monomers
To 40% by weight and 95 to 30 parts by weight of a monomer mixture consisting of 0 to 20% by weight of at least one monovinyl monomer copolymerizable therewith with a polymerization initiation temperature of 40 to 50 ° C.
Then, the whole amount of 1.2 to 1.5 parts by weight / min was charged by a dropping method, and the emulsion polymerization was performed under reaction conditions of 0.10 to 0.20 parts by weight of a reaction initiator and a peak temperature of 60 to 80 ° C. of the polymerization system. A thermoplastic resin composition containing the graft rubber as a main component, which is excellent in plating properties, impact resistance, and large-scale moldability. 2. An organosiloxane represented by the general formula 1, ## STR1 ## (In the formula, R ^{1 to} R ⁴ each independently represents an alkyl group having 1 to 8 carbon atoms or an allyl group, and m represents an integer of 1 or more.) A silane compound represented by the general formula: 2] (In the formula, R ^{1 to} R ⁴ each independently represent an alkyl group having 1 to 8 carbon atoms or an allyl group.) And an organohalosilane represented by the general formula 3 (In the formula, R ⁵ is an alkyl group having 1 to 8 carbon atoms or an allyl group,
Y represents halogen and n is 1 to 3. 2. The plating property, impact resistance and large size according to claim 1, wherein at least one of the organosilicon compounds in 1) is blended in an amount of 0.01 part by weight or more and 15 parts by weight or less based on 100 parts by weight of the total amount of the thermoplastic resin. A thermoplastic resin composition having excellent moldability.