JP2002322329A - Styrene resin composition and blow molded product thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the surface properties of a molded product obtained by blow molding and to have excellent secondary workability such as painting and plating of the molded product. A styrenic resin composition excellent in falling weight strength and a blow-molded article having such properties. SOLUTION: (A) 100 parts by weight of styrene resin, especially ABS resin, (B) 0.01 to 5 parts by weight of fatty acid glyceride, especially fatty acid glyceride having 8 to 40 carbon atoms in fatty acid ester portion. And a molded article obtained by blow molding such a styrene resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a styrenic resin composition and a molded article, and more particularly to a styrenic resin composition suitable for blow molding and a molded article thereof.

[0002]

2. Description of the Related Art Conventionally, thermoplastic resins such as high-density polyethylene, low-density polyethylene, linear low-density polyethylene, and polyvinyl chloride have been used as materials for blow molding (blow molding) for obtaining bottles and the like. ing. In recent years, in order to obtain electric and electronic parts such as air ducts and lighting equipment, automotive parts such as air spoilers and consoles, and furniture such as desk tops, they have excellent thermal and mechanical properties. So-called engineering plastics, for example,
For example, those described in JP-A-32454 and JP-A-11-314266 are used.

Conventionally, the resin composition for blow molding described in Japanese Patent Application Laid-Open No. H11-314266 shows a small but large amount of dents (hereinafter referred to as dents) generated on the surface of a molded product obtained by blow molding. Despite the improvement, sanding is required in applications where a smooth painted surface such as an air spoiler is required due to the appearance of die lines and stripe-like gloss unevenness (hereinafter referred to as stripes) on the surface of the molded product obtained during continuous molding. In many cases, secondary processing is required, and the situation is not always satisfactory. JP-A-7-1085
No. 34 proposes a mold for blow molding provided with a means for heating and a means for cooling for the purpose of improving the transfer of the resin to the mold surface. However, such a blow molding die is not only expensive, but also has a molding cycle longer than before, resulting in a decrease in productivity and is not yet satisfactory.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a styrenic resin composition which is excellent in surface properties of a molded article obtained by blow molding, and is excellent in secondary workability such as coating and plating, and blow molding which is excellent in these properties. The purpose is to provide goods.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve these problems. As a result, a composition obtained by blending a fatty acid glyceride with a styrene-based resin can make the surface of a blow-molded product uniform. The present invention was found to be excellent in secondary workability such as coating and plating, and completed the present invention.

That is, the present invention relates to (A) a styrene resin 1
(B) fatty acid glyceride in an amount of 0.0
A styrene-based resin composition (Claim 1), wherein the styrene-based resin (A) is an ABS-based resin; and a fatty acid glyceride (Claim 1). B) is a fatty acid ester moiety having 8 to 40 carbon atoms.
The present invention also relates to a resin composition according to claim 1 which is a fatty acid glyceride of claim 1 (claim 3) and a styrene resin blow molded article obtained by blow molding the resin composition according to claim 1, 2 or 3.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION As the styrene resin (A) used in the present invention, general (GP) polystyrene, high impact (HI) polystyrene, AS resin which is a styrene-acrylonitrile copolymer, styrene-butadiene- ABS resin comprising acrylonitrile copolymer, the ABS
A heat-resistant ABS resin in which part or most of styrene of the resin is replaced by α-methylstyrene or maleimide, an (heat-resistant) AES resin in which butadiene is replaced by ethylene-propylene rubber or polybutyl acrylate, and a (heat-resistant) AAS ABS-based resins such as resins, and ABS-based resins obtained by replacing butadiene with silicon rubber or silicon-acrylic composite rubber (heat-resistant) are exemplified. These styrene resins are used alone or in combination of two or more. Further, the styrene resin may be used alone or in combination of two or more of polycarbonate, polyamide, polybutylene terephthalate, polyethylene terephthalate and the like. The styrene resin has a heat distortion temperature (ASTM D-648-56: 4.6 kg / cm).
⁽² loads) of 80 ° C. or higher is preferable because deformation due to heat during use of the molded article and deformation during drying of the molded article in a coating line are small.

[0008] Among these styrene resins, ABS resins are preferable in view of workability and strength of a molded article.

The method for producing the ABS resin or the ABS resin is not particularly limited, and an emulsion polymerization method, a suspension polymerization method, a solution polymerization method and the like can be applied. The emulsion polymerization can easily control the particle diameter of rubber particles. It is particularly preferably used from the viewpoint of the impact resistance of the molded article. For example, it is produced by graft copolymerizing a vinyl-based monomer in the presence of rubber and, if necessary, copolymerizing the vinyl-based monomer and subjecting it to salting out and coagulation. The (B) fatty acid glyceride used in the present invention comprises:
The fatty acid ester moiety has 8 to 40 carbon atoms, and the fatty acid ester moiety may be saturated or unsaturated. For example, fatty acid glyceride is an ester of glycerin and a fatty acid, and the fatty acid preferably has 8 to 40 carbon atoms in terms of dispersibility in a resin and processability. 8 to 40 carbon atoms
The fatty acids are caprylic acid, lauric acid, palmitic acid,
Stearic acid, behenic acid, montanic acid, laxeric acid, oleic acid, erucic acid, sorbic acid, linoleic acid, linolenic acid and the like. From the viewpoint of processability, fatty acids having 12 to 30 carbon atoms are preferred. Glycerin fatty acid esters such as glycerin monostearate, glycerin monooleate, and glycerin docosanoate are exemplified. Fatty acid glycerides having a hydroxy group such as hardened castor oil may be used. Examples of fatty acid glycerides include synthetic fatty acid glycerides, natural fats and oils, and their hardened and partially hardened oils. Natural fats and oils include coconut oil, palm kernel oil, herring oil, cod liver oil, whale oil, palm oil, cottonseed oil, olive oil, peanut oil, soybean oil, linseed oil, castor oil, beef tallow, and the like. From the viewpoint of processability, preferred are hardened oils or partially hardened oils of natural fats and oils, which are used alone or in combination of two or more. The melting point is preferably from 40 ° C. to 120 ° C., and more preferably from 45 ° C. to 100 ° C. from the viewpoint of workability.

The fatty acid glyceride has 8 to 40 carbon atoms in the fatty acid ester portion. If the number of carbon atoms is less than 8, it bleeds to the surface of the molded article or deteriorates the adhesion of the paint at the time of coating. If it exceeds 40, the dispersion in the resin becomes poor, which is not preferable.

The amount of the component (B) used is 0.01 to 5 parts by weight, preferably 0.05 to 3 parts by weight, and more preferably 0.1 to 5 parts by weight, based on 100 parts by weight of the styrene resin (A). 1 to 3 parts by weight. If the amount is less than 0.01 part by weight, the effect is insufficient. On the other hand, if it exceeds 5 parts by weight, the effect saturates and becomes uneconomical. It is not preferable.

The above resin composition contains an antioxidant, talc powder, an alkali metal hydroxide or carbonate, or an alkaline earth metal hydroxide, carbonate or oxide;
Further, if necessary, a lubricant, a colorant, an organic silicone oil, a benzophenone-based ultraviolet absorber, a benzotriazole-based ultraviolet absorber, a hindered amine light stabilizer and a benzoether light stabilizer, an antistatic agent, a flame retardant,
One or more of a flame retardant auxiliary agent, an antibacterial and fungicide may be mixed. In order to further improve drawdown resistance and the like, polytetrafluoroethylene, a high molecular weight AS resin (weight average molecular weight of 500,000 to
3 million) and high molecular weight PMMA (polystyrene-equivalent weight average molecular weight of 500,000 to 3,000,000).

As the antioxidant, one or more selected from the group consisting of phenolic antioxidants, phosphite antioxidants and thioether antioxidants can be blended. As the phenolic antioxidant, 1,3,5-tris (2 ′, 6) is a hindered phenolic antioxidant in which both ortho positions or one of the phenolic hydroxyl groups are substituted with a bulky tertiary butyl group. '-Dimethyl-4'-t-butyl-3-hydroxylbenzyl) isocyanurate, 1,1,3-tris (2'-methyl-4'-hydroxy-5'-t-butylphenyl) butane, tetrakis [methylene -3
(3 ′, 5′-di-tert-butyl-4′-hydroxyphenyl) propionate] methane, 3,9-bis [1,1-
Dimethyl-2- {β- (3-t-butyl-4-hydroxy-5-methylphenyl) propionyloxyethyl}
2,4,8,10-tetraoxaspiro [5,5] udecan, 4,4′-thiobis (3-methyl-6-t-butylphenol), 2- [1- (2-hydroxy-3,5
-T-pentylphenyl) ethyl] -4,6-di-pentylphenyl acrylate, pentaerythritol tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], ethylenebis (oxyethylene) Bis [3- (5-t-butyl-4-hydroxy-m-tolyl) propionate] and the like.

Examples of the phosphite-based antioxidant include bis- (2,4-di-t-butylphenyl) pentaerythritol diphosphite and bis- (2,6-di-t-butyl-4-methylphenyl). -Pentaerythritol diphosphite, 2,2-methylenebis (4,6-di-t
-Butylphenyloctyl) phosphite and the like.

Examples of the thioether-based antioxidant include demyristyl-3,3'-thiodepropionate, destearyl-3,3'-thiodepropionate, and pentaerythryl-tetrakis (3-laurylthiopropinate). Furthermore, when the phenolic antioxidant, the phosphite antioxidant, and the thioether antioxidant are used in combination, a synergistic effect is exhibited, and a high antioxidant effect can be obtained even with a small amount of addition.

The talc powder is hydrated magnesium silicate (4SiO ₂ · 3MgO · H ₂ O), and SiO ₂ is about 6%.
0%, a mineral composed of about 30% of MgO ₂ . The average particle size (weight average particle size) of the talc powder is preferably 5 μm or less, and if it exceeds 5 μm, the impact strength tends to decrease. The talc powder may have different average particle sizes. Further, talc powder may be used after surface treatment with a silane coupling agent or the like.

Examples of the alkali metal hydroxide or carbonate include lithium hydroxide, sodium hydroxide, potassium hydroxide, rubidium hydroxide, and cesium hydroxide; lithium carbonate, sodium carbonate, potassium carbonate, rubidium carbonate, and cesium carbonate. And, as the alkaline earth metal hydroxide, carbonate or oxide, beryllium hydroxide, magnesium hydroxide, calcium hydroxide,
Strontium hydroxide, barium hydroxide; beryllium carbonate, magnesium carbonate, strontium carbonate, barium carbonate; beryllium oxide, magnesium oxide, calcium oxide, strontium oxide, barium oxide. These may be used alone or in combination of two or more. Among them, magnesium hydroxide, calcium hydroxide, magnesium oxide, calcium oxide, sodium carbonate and magnesium carbonate are particularly preferred from the viewpoint of effect, safety and economy. The average particle size (weight average particle size) of the hydroxides, carbonates, and oxides of alkali metals is preferably 4 μm or less, and if it exceeds 4 μm, the impact strength is reduced. Tend. Also, alkali metal hydroxides, carbonates, alkaline earth metal hydroxides,
The carbonates and oxides may be used after being surface-treated with stearic acid, a silane coupling agent or the like.

As the above-mentioned lubricant, as an amide-based lubricant,
Fatty acid amides such as stearic acid amide, oleic acid amide, erucic acid amide; alkylenebisfatty acid amides such as methylenebisstearic acid amide, ethylenebisstearic acid amide, ethylenebisoleic acid amide;
As hydrocarbon lubricants, liquid paraffin, paraffin wax, micro wax, polyethylene wax, etc .; as fatty acid lubricants, stearic acid, 12-hydroxystearic acid, etc .; as higher alcohol lubricants,
Stearyl alcohol and the like; ester lubricants other than fatty acid glycerides such as butyl stearate, pentaerythritol tetrastearate, and stearyl stearate; metal soaps such as magnesium stearate and calcium stearate; These are used in combination.

Examples of the colorant include titanium white (titanium oxide), titanium yellow, carbon black, iron oxide red, ultramarine blue, and complex oxide colorants. The molecular weight of the organic silicone oil is not particularly limited, but is preferably about 1,000 to 50,000. The viscosity of the organic silicone oil is not particularly limited, either.
One million cSt (centistokes) is preferable, and 10,000 to 200,000 cst is preferable from the viewpoint of impact resistance.

The above-mentioned benzophenone-based ultraviolet absorber, benzotriazole-based ultraviolet absorber, hindered amine-based light stabilizer and benzoether-based light stabilizer include benzophenone-based ultraviolet absorber;
-Methoxybenzophenone, 2-hydroxy-4-n-
As a benzotriazole-based ultraviolet absorber such as octoxybenzophenone, 2- (2′-hydroxy-5′-
Methylphenyl) benzotriazole, 2- (2′-hydroxy-3′-t-butyl-5′-methylphenyl)
-5-chlorobenzotriazole, 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl)] phenyl] -2H-benzotriazole, 2,2′-methylenebis [4- (1,1, 3,3-tetratylbutyl)-
As hindered amine light stabilizers such as 6- (2H-benzotriazole), bis- (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis- (1,
2,2,6,6-pentamethyl-4-piperidyl) sebacate, [dimethyl-1- (2-hydroxyethyl) -4-hydroxy-2,6,6-tetramethylpiperidine succinate] condensate, poly} [6- (1,1,3,3-tetramethylbutyl) imine] -1,3,5-triazine-2,4-diyl [(2,2,6,6-tetramethyl-
4-piperidyl) imino] hexamethylene [(2,2
6,6-tetramethyl-4-piperidyl) iminol]}, tetragis (2,2,6,6-tetramethyl-
4-piperidyl) 1,2,3,4-butanetetracarboxylate, 1,2,2,6,6-pentamethyl-4-
Piperidyl-tridecyl-1,23,4-butanetetracarboxylate, 1,2,2,6,6-pentamethyl-4-piperidinol and 3,9-bis (2-hydroxy-1,1-dimethylethyl) -2 , 4,8,10-
As a benzoether light stabilizer such as an ester of tetraspiro [5,5] undecane and butanetetracarboxylic acid, 2,4-di-t-butylphenyl-3,5-di-t
-Butyl-4-hydroxybenzoate and the like. Further, the above-mentioned benzophenone-based ultraviolet absorber, benzotriazole-based ultraviolet absorber, hindered amine-based light stabilizer and benzoether-based light stabilizer are used alone or in combination of two or more.

Examples of the antistatic agent include amines, ammoniums, sulfonic acids, polyoxyethylenes, and polyether-polyamide blocks.
Examples of the flame retardant and flame retardant auxiliary include tetrabromobisphenol A, bis (dibromopropyl) tetrabromobisphenol A, octabromodiphenyl ether, decabromodiphenyl ether, hexabromocyclododecane, brominated polycarbonate, terminal-modified and unmodified bromine Epoxy flame retardants (eg, glycidyl ether polymer of tetrabromobisphenol A), phosphates (such as tributyl phosphate and tricresyl phosphate), and halogenated phosphates (such as tris (2,3-dibromopropyl) ) Phosphate, tris (bromochloropropyl) phosphate), antimony trioxide, brominated polyethylene and the like.

Examples of the antibacterial and fungicide include organic agents such as imidazole, thiazole, nitrile, haloalkyl and pyridine, silver, zinc, copper and the like.
An inorganic type such as a titanium type may be used. Among these, it is preferable to use a silver-based material that is thermally stable and has high performance. Silver antibacterial agents include zeolite, silica gel, zirconium phosphate, calcium phosphate, hydrotalcite, hydroxyapatite, calcium silicate, and other porous structures carrying silver, silver ions, silver complexes, and silver compounds. And silver salts of fatty acids, silver salts of alkyl phosphates, and the like.

The process of producing a blow-molded article includes a step of obtaining a styrene resin composition for blow molding as described above, and a step of blow-molding the resin composition. As an example of the method for producing the styrene resin composition for blow molding, for example, a powder, flake or pellet-like styrene resin (A) and a fatty acid glyceride (B) are mixed with a Henschel mixer to obtain a single-shaft or multi-shaft resin. It is manufactured by melt extrusion with a shaft extruder and pelletization.

The styrenic resin composition of the present invention can be suitably used especially as a blow molding resin composition. As blow molding method, besides normal blow molding,
Various methods such as a sheet parison method, a cold parison method, a bottle pack method, an injection blow molding method, and a stretch blow molding method can be employed. In this blow molding step, it is preferable to blow-mold the obtained resin composition with a parison or sheet at 200 ° C. or higher from the viewpoint of blow-up properties, surface properties, and the like. In order to obtain a better effect, an inert gas such as nitrogen, carbon dioxide, helium, argon, or neon may be used instead of air when the parison and the sheet are expanded.

The styrenic resin composition of the present invention is particularly suitable for blow molding as described above, but provides excellent molded articles in injection molding, extrusion molding, calender molding and the like as in the case of blow molding. You can do it.

[0026]

EXAMPLES Examples and comparative examples are shown below, but the present invention is not limited thereto. The evaluation methods in this example and comparative examples are summarized below.

(Reduced Viscosity) The obtained pellet was dissolved in methyl ethyl ketone at 23 ° C. for 12 hours, followed by centrifugation, and a soluble matter was precipitated with methanol. The precipitate was dried with a vacuum drier to obtain a sample. The obtained sample was made into a 0.3% solution of N, N-dimethylformamide and measured at 30 ° C. with a Ube-Rohde viscometer.

(Heat Deformation Temperature: HDT) ASTM D-6
The measurement was carried out at a load of 0.45 MPa in accordance with No.48.

(Bending strength and flexural modulus) ASTM
It measured at 23 degreeC according to D-790.

(Evaluation of Blow Molding) The obtained pellet-shaped resin composition was blow-molded with a DA-50 blow molding machine manufactured by Placo Co., Ltd. to obtain a molded product. The molding conditions are as follows: parison temperature is about 240 ° C., injection speed (index) is 150,
Screw rotation speed is 60 rpm, blow pressure is 0.59M
PaG (air), cooling time 100 seconds, mold temperature 60
° C. The following evaluation was performed about the obtained blow molded article.

(Surface Appearance) Using a cylindrical blow molded article having a diameter of 70 mm × 400 mm and an average thickness of 3 mm, streaks on the surface of the molded article were visually observed, and an average value at five points of the molded article was obtained, and evaluated according to the following criteria. did. ：: The number of lines is less than two on average. Δ: The number of streaks is 2 to less than 5 on average. X: The number of lines is 5 or more on average.

(Paintability) 60 mm × 400 mm × 30 m
m, using a box-shaped blow molded body with an average thickness of 3.5 mm,
A blue urethane paint was spray-coated so that the film thickness became 25 to 35 μm, and baked in an oven at 80 ° C. for 30 minutes. Using a cutter knife on this painted surface, draw 11 parallel lines of 2 mm equally spaced reaching the substrate, draw 11 parallel lines of 2 mm equally spaced perpendicular to these parallel lines, and square surrounded by four straight lines 100 pieces were drawn, and this part was subjected to a peel test of the coating film using an adhesive tape (Nichiban industrial cellophane tape) having a width of 24 mm, and evaluated according to the following criteria. ：: No peeling of the coating film. ×: Peeling of the coating film was observed. In addition, paint is the main agent (Rethane PG) manufactured by Kansai Paint Co., Ltd.
60 (revised)) / thinner (Rethane PG60 (revised) standard thinner) with a weight ratio of 10/7 was used.

(Plating property) 60 mm × 400 mm × 30
mm, using a box-shaped blow molded product having an average thickness of 3.5 mm, degreased (60 ° C. × 5 minutes), washed with water and etched at 65 ° C. × 10 minutes (CrO ₃ 400 g / l, H ₂ SO ₄ 400 g /
l), after washing with water, acid treatment at room temperature (20 ° C.) × 3 minutes, washing with water, catalysis treatment at room temperature (20 ° C.) × 3 minutes, and washing with water at 40 ° C.
Activation treatment, washing with water and chemical nickel plating (40 ° C x
6 minutes), washed with water and electroplated with copper (film thickness 20 μm, 20 ° C.)
× 20 minutes), washed with water and electroplated with nickel (film thickness 10μ)
m, 55 ° C. × 15 minutes), washed with water, and plated by electrochromic plating (film thickness: 0.5 μm, 45 ° C. × 3 minutes). The plated sample was cycled at -30 ° C. × 2 hours and 80 ° C. × 2 hours, and the surface was observed after 4 cycles.
Evaluation was made according to the following criteria. ：: No change is observed. ×: Blistering is observed.

(Strength of falling weight) Using a cylindrical blow molded article having a diameter of 70 mm x 400 mm and an average thickness of 3 mm, measuring the falling weight strength (weight of weight x half-fracture height (kgm)) at -30 ° C did. In addition, "parts" shown below all means "parts by weight". (A) Production of Styrene Resin Styrene Resin 1: i) Copolymer A In a polymerization vessel equipped with a stirrer, 250 parts of water and 0.5 part (solid content) of sodium palmitate are charged, and the temperature is raised to 60 ° C. After that, the atmosphere was replaced with nitrogen. Subsequently, 0.01 parts of disodium ethylenediaminetetraacetate, and ferrous sulfate (heptahydrate) 0.00
After adding 25 parts and 0.4 parts of sodium formaldehyde sulfoxylate, 65 parts of α-methylstyrene, 30 parts of acrylonitrile, 5 parts of styrene, 0.25 part of t-dodecyl mercaptan and 0.2 part of cumene hydroperoxide were added. The mixture was added continuously over 8 hours. 1.5 hours after continuous addition, 0.5% sodium palmitate was added.
Parts (solids), sodium palmitate 0.1 at 3 hours.
Five parts (solids) were added. Further post-polymerization was performed for 2 hours to obtain a copolymer latex. The polymerization conversion was 98%.

Ii) Graft copolymer B In a polymerization vessel equipped with a stirrer, 250 parts of water, polybutadiene latex (weight average particle diameter 0.3 μm, gel fraction 90
%) (Solid content), the temperature was raised to 60 ° C., and the atmosphere was replaced with nitrogen. Subsequently, 0.01 parts of disodium ethylenediaminetetraacetate and 0.002 of ferrous sulfate (heptahydrate) were added.
5 parts, sodium formaldehyde sulfoxylate 0.
After adding 4 parts, a mixture of 10 parts of acrylonitrile, 20 parts of styrene and 0.3 part of cumene hydroperoxide was continuously added over 5 hours. Further post-polymerization was carried out for 3 hours to obtain a latex of a graft copolymer. The polymerization conversion was 98% and the graft ratio was 45%. The copolymer A and the graft copolymer B were mixed as a latex at a ratio of 7: 3 (weight ratio of solid content). The resulting mixture was salted out with calcium chloride, washed, filtered, and dried to obtain a powdery styrene resin 1. The obtained styrene-based resin 1 has a reduced viscosity of 0.70 dl / g, HDT
It was 118 ° C. (measured by cutting out a blow molded body to form a test piece), bending strength (measured by cutting out a blow molded body to form a test piece), and bending modulus of 2200 MPa.

Styrene-based resin 2: A monomer mixture of the styrene-based copolymer A was prepared using N-phenylmaleimide 20
Parts, acrylonitrile 20 parts and styrene 60 parts, and powdery styrene resin 2 was obtained in the same manner as styrene resin 1 except that sodium palmitate was changed to sodium dodecylbenzenesulfonate. The polymerization conversion of the copolymer A was 97%. The obtained styrene-based resin 2 had a reduced viscosity of 0.68 dl / g and an HDT of 127.
° C, bending strength was 72 MPa, and bending elastic modulus was 2350 MPa.

Styrene resin 3: 29 parts of acrylonitrile was mixed with a monomer mixture of copolymer A of the styrene resin,
A powdery styrene resin 3 was obtained in the same manner as the styrene resin 1 except that the styrene resin was changed to 71 parts. The polymerization conversion of the copolymer A was 99%. The obtained styrene-based resin 3 had a reduced viscosity of 0.72 dl / g, HDT102
° C, bending strength was 71 MPa, and bending elastic modulus was 2200 MPa.

Styrene resin 4: Styrene resin 1
Was changed to a polybutadiene latex having a weight average particle size of 0.09 μm and a gel fraction of 90%, and a monomer mixture comprising 9 parts of acrylonitrile, 19 parts of styrene, and 2 parts of glycidyl methacrylate. A powdery styrene-based resin 4 was obtained in the same manner as in the styrene-based resin 1 except that the styrene-based resin 1 was used. The polymerization conversion of the graft copolymer B was 98%, and the graft ratio was 38.
%Met. The obtained styrene-based resin 4 had a reduced viscosity of 0.73 dl / g, an HDT of 115 ° C., and a bending strength of 69 MP.
a, the flexural modulus was 2050 MPa.

Styrene resin 5: Styrene resin 1
A powdery styrene resin 5 was prepared in the same manner as the styrene resin 1 except that the polybutadiene latex of the graft copolymer B was changed to a polybutyl acrylate latex having a weight average particle diameter of 0.25 μm and a gel fraction of 85%. Obtained. The polymerization conversion of the graft copolymer B was 98%, and the graft ratio was 42%. The obtained styrenic resin 5
Was 0.71 dl / g in reduced viscosity, 117 ° C. in HDT, 70 MPa in bending strength, and 2200 MPa in bending elastic modulus.

Styrene resin 6: Styrene resin 1
The mixing ratio of copolymer A and graft copolymer B is 40
Part: powdery styrene resin 6 was obtained in the same manner as styrene resin 1 except that the amount was changed to 60 parts. The obtained styrenic resin 6 has an HDT of 95 ° C. and a bending strength of 30.
MPa and the flexural modulus were 1050 MPa.

Styrene resin 7: Styrene resin 1
The mixing ratio of the copolymer A and the graft copolymer B is 85
Part: powdered styrene resin 7 was obtained in the same manner as styrene resin 1 except that the amount was changed to 15 parts. The obtained styrenic resin 7 has an HDT of 125 ° C. and a bending strength of 9
The flexural modulus was 0 MPa and the flexural modulus was 3000 MPa.

The following components were used as the component (B). a: Partially cured beef tallow: Nippon Yushi Co., Ltd. Tallow 51 ゜ hardened oil (trade name, melting point 51 ° C.) b: Hardened castor oil: Ogura Gosei Kogyo Co., Ltd. Custerwax PS (trade name, melting point 85 ° C.) c: Stearic acid Monoglyceride: Rikemar S-200 (trade name, melting point 60, manufactured by Riken Vitamin Oil Co., Ltd.)
° C) The following were used as components other than the component (B). d: Oleic acid monoamide: Alflo E-10 manufactured by NOF Corporation (trade name, melting point: 72 ° C) e: Stearyl stearate: UNISTAR M-9676 manufactured by NOF Corporation (trade name: melting point: 52 ° C) f: Ethylene bis Stearoamide: Alflo H-50S (trade name, melting point 140 ° C.) manufactured by NOF CORPORATION The components (A) and (B) are in the proportions shown in Table 1, and further, phenolic antioxidants: 1,1,3 -Tris (2'-methyl-4'-hydroxy-5'-t-butylphenyl) butane: ADK STAB AO-30 manufactured by Asahi Denka Kogyo Co., Ltd.
(Trade name) 0.5 parts by weight, phosphite-based antioxidant: bis- (2,6-di-t-butyl-4-methylphenyl) -pentaerythritol diphosphite: ADK STAB manufactured by Asahi Denka Kogyo KK 0.5 parts by weight of PEP-36 (trade name), 1.5 parts by weight of magnesium hydroxide: Kisuma 5 (trade name, average particle size: 0.8 μm) manufactured by Kyowa Chemical Industry Co., Ltd., talc powder: Nippon talc 1.0 part by weight of Micro Ace L-1 (trade name, average particle size: 1.8 μm) manufactured by Co., Ltd. was mixed using a Henschel mixer, and a vented single screw extruder (HV-40-) was added. 28,
(Tabata Machine Industry Co., Ltd.) and extruded at a set temperature of 270 ° C. to obtain styrene resin compositions of Examples 1 to 12 and Comparative Examples 1 to 6. These were evaluated according to the evaluation method described above. The evaluation results are shown in Tables 1 and 2.

[0043]

[Table 1]

[0044]

[Table 2] As is clear from the results in Tables 1 and 2, the styrenic resin composition containing a predetermined amount of fatty acid glyceride has excellent surface properties of the blow-molded article, and has good paintability and secondary workability of plating. It turns out that it is excellent.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // B29K 25:00 B29K 25:00 F term (reference) 4F071 AA22 AC10 AF27 BB05 BC04 4F208 AA13 AB07 AB20 AM32 AM36 LA01 LB01 LG03 LG05 LG22 4J002 BC031 BC061 BN061 BN151 EH046 FD010 FD070 GG01 GQ00

Claims (4)

[Claims] A styrene resin composition comprising (A) 100 parts by weight of a styrene resin and (B) 0.01 to 5 parts by weight of a fatty acid glyceride. 2. The resin composition according to claim 1, wherein the styrene resin (A) is an ABS resin. 3. The resin composition according to claim 1, wherein the fatty acid glyceride (B) is a fatty acid glyceride having 8 to 40 carbon atoms in the fatty acid ester portion. 4. A styrene-based resin blow-molded article obtained by blow-molding the resin composition according to claim 1, 2 or 3.