JPS61209245A - Thermoplastic resin composition - Google Patents

Abstract

PURPOSE:A composition having improved impact resistance, improved molding and processing properties, good appearance, improved luster and thermal stabil ity, obtained by blending a rubber-containing styrenic resin having reduced content of organic acidic substance with a specific nitrogen-containing compound. CONSTITUTION:A mixture obtained by blending 100pts.wt. rubber-containing styrenic resin with 0.1-10pts.wt. compound shown by the formula [R1 is alkyl; R2 and R3 are H, or methyl; R4 is alkyl or -C(O)R6; R5 is H, alkyl, or -C(O)R7; R6 and R7 are alkyl; m and n are 1-20], containing <=0.5wt% organic acidic substance in the resin. C10H21N(C2H4OH)(C2H4OCH3), etc. are used as the com pound.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rubber-containing styrenic resin composition that has excellent impact resistance, moldability, and gloss, as well as improved thermal stability.

(Prior art) Rubber-containing styrenic resins are generally recognized as thermoplastic resins with excellent impact resistance, moldability, and gloss.
It has come to be used in a wide variety of industries.

As the uses of rubber-containing styrenic resins become more diverse, the performance that industry expects from these resins becomes increasingly sophisticated.In particular, market demands for molding processability and appearance of molded products, including gloss, are increasing. It's getting tougher.

Taking ABS resin as an example of rubber-containing styrene resin, ABS resin is a composite resin in which rubber particles, typically polybutadiene rubber, are dispersed in a dispersion medium of thermoplastic resin, typically AS resin. However, in order to improve the moldability or gloss of ABS resin, it is effective to reduce the rubber content or reduce the melt viscosity of the dispersion medium (hereinafter referred to as matrix resin). It is publicly known.

However, a decrease in the rubber content or a decrease in the melt viscosity of the matrix resin both result in a decrease in the impact resistance of the ABS resin, which greatly limits the uses of the resin.

In order to improve the molding processability of rubber-containing styrenic resins or the appearance of molded products without sacrificing impact resistance, for example, a method using a matrix resin having a specified molecular weight (Japanese Patent Publication No. 1983-1999) has been proposed. 37675, Japanese Patent Publication No. 53-4862, Japanese Patent Publication No. 57-24814, Japanese Patent Publication No. 59-2300, Japanese Patent Publication No. 59-15145, Japanese Patent Publication No. 59-1499L!, etc.), particle diameter of rubber particles and/or Or method for specifying gel content (4I Publication No. 57-5140)
No. 4, Special Publication No. 59-28576, Special Publication No. 59-285
84, etc.), a method of copolymerizing specified monomers (JP-A-56-57813, etc.), a method of adding specified additives (JP-A-55-3494, JP-A-55) -1
No. 7144, Ger, Offen, No. 3206138, etc.) are well known. Here, the method of controlling the molecular weight of the matrix resin does not include a technique that actively aims at improving impact resistance, and its improvement effect is insufficient for practical use. In addition, the method of controlling rubber particles is aimed at improving impact resistance, but it is also necessary to reduce the rubber content or It is not possible to achieve a reduction in the melt viscosity of the resin.

Further, although modification using specified additives is an effective means, the modification effect using polysiloxane, for example, has not yet met market demands.

In addition, while some additives significantly improve the impact resistance of rubber-containing styrenic resins, they lack thermal stability and cause the hue of molded products to turn yellow. Esters of higher fatty acids and norbitane are known.

(Problems to be Solved by the Invention) As described above, attempts to improve the moldability of rubber-containing styrenic resins and the appearance of molded products while maintaining impact resistance have not yet been satisfied. The problem to be solved by the present invention is to simultaneously achieve improvements in the above-mentioned contradictory characteristics.

(Means for Solving the Problems) That is, the present invention comprises: 100 parts by weight of a rubber-containing styrenic resin and the general formula [I]
A thermoplastic resin composition characterized in that the content of organic acidic substances contained in the rubber-containing styrenic resin is 0.5% or less in a mixture with 0.1 to 10 parts by weight of the compound represented by It is.

General formula CI] [In the formula, R is an alkyl group, R3 and R8 are each H or a methyl group, R4 is an alkyl group or -CIOIR
6 (Rs is an alkyl group), R3 is a H1 alkyl group or 10 (01Ry (Rt is a monomer constituting the rubber component of the rubber-containing styrenic resin used in the present invention).
Conjugated diene monomers such as butadiene, isoprene, dimethylputadiene/, chlorobrene, cyclopentadiene,
Non-conjugated diene monomers such as 2,5-norbornadiene, 1,4-cyclohexadiene, 4-ethylidenenorbornene, styrenic monomers such as styrene, α-methylstyrene, vinyltoluene, acrylonitrile, methacrylonitrile, etc. (meth) nitrile monomers, methyl methacrylate, ethyl acrylate, butyl acrylate, hexyl acrylate, octyl acrylate, etc.
Acrylic acid ester monomer, ethylene, propylene, 1
-Olefin monomers such as puden, imbutylene, and 2-butene are used, and these are used alone or in copolymerization. In addition, a polyfunctional vinyl monomer can be copolymerized as a crosslinking monomer, and polyfunctional vinyl monomers that can be used include divinylbenzene, ethylene glycol dimethacrylate, 1,3-butylene Glycol dimethacrylate, 1,4-butylene glycol dimethacrylate, propylene glycol dimethacrylate,
Examples include triallyl cyanurate, triallyl incyanurate, trimethylolpropane trimethacrylate, allyl acrylate, allyl methacrylate, vinyl acrylate, vinyl methacrylate, glycidyl acrylate, and glycidyl methacrylate.

The rubber component used in the rubber-containing styrenic resin of the present invention must have a graft active site, and specifically it is preferable that the rubber component has a carbon-carbon double bond in the rubber molecule. .

There are no particular restrictions on the method of polymerizing the monomers, including emulsion polymerization,
Known techniques such as solution polymerization can be used.

Further, the rubber component of the rubber-containing styrenic resin does not need to be of one type, and may be a mixture of two or more separately polymerized rubber components.

Monomers constituting the matrix resin of the rubber-containing styrenic resin used in the present invention include styrene monomers such as styrene, α-methylstyrene, vinyltoluene, and L-butylstyrene, acrylonitrile, methacrylonitrile, etc. Nitrile monomer, (meth)acrylic acid ester monomer such as methyl methacrylate, ethyl acrylate, butyl acrylate, hexyl acrylate, octyl acrylate, maleimide, N-methylmaleimide, N-ethylmaleimide, N-propylmaleimide,
There are maleimide monomers such as N-cyclohexylmaleimide, N-phenylmaleimide, N-)ruylmaleimide, and N-xylylmaleimide, which are used alone or in copolymerization, but they must contain a styrene monomer. shall be.

The rubber-containing styrenic resin used in the present invention is composed of a rubber component and a matrix resin as described above, and a graft structure is present at the interface between the rubber component that has a spherical structure and the matrix resin that is a continuous phase. It is necessary.

It is known that such a structure can be achieved by a so-called graft polymerization method in which a part or all of the monomers constituting the IJ lux fat are polymerized in the presence of a rubber component. Rubber-containing styrenic resins can also be produced by known graft polymerization techniques.

In order to adjust the content of the rubber component contained in the rubber-containing styrenic resin, it is also possible to mix a separately polymerized IJ lux fat component with the rubber-containing styrenic resin; M) The IJ lux fat component does not need to have the same composition as the resin component obtained by graft polymerization.

For example, in the presence of polybutadiene, acrylonitrile-
A matrix resin component obtained by copolymerizing acrylonitrile-styrene-α-methylstyrene can be mixed with a rubber-containing styrenic resin obtained by graft polymerizing styrene-methyl methacrylate.

Specific examples of the rubber-containing styrenic resin used in the present invention include high-impact polystyrene, ABS (acrylonitrile-butadiene-styrene) resin, and heat-resistant ABS.
(acrylonitrile-butadiene-styrene-α-methylstyrene) resin, AAS (acrylonitrile-acrylic acid ester-styrene) resin, AES (acrylonitrile-gPDM-styrene) resin, MBAS (methyl methacrylate-butadiene-acrylonitrile-styrene) resin, etc. be.

In the present invention, 1 to 1 of the compound represented by the general formula [I] is added to 100 parts by weight of the rubber-containing styrenic resin.
It contains 0 parts by weight, preferably 0.2 to 8 parts by weight.

In the above formula, R+% R4, Rs, Ra, and R7
The alkyl groups are each a methyl group, an ethyl group, a brobyl group,
These include butyl group, hexyl group, octyl group, decyl group, dodecyl group, tetradecyl group, hexadecyl group, octadecyl group, eicosyl group, etc., and may have an unsaturated bond in the carbon chain. Also, the integers of m and n are each 2
If it exceeds 0, the compatibility with the rubber-containing styrenic resin will be poor and undesirable. Further, in the compound of the general formula [I], it is particularly preferable that R8 is a higher alkyl group of hexyl or higher, and m and n are each an integer of 1 to 10, more preferably 1 to 6.

As a specific compound, for example, Cl8H! 7N(C
2H40)() (C,H40CH,), C1°Htt
N (C, H40H) (C2H40HtHs), C3
゜H□N (C1H40H) (CtHaOC6HI3
), C8°T(!IN(CzHaOH) (C, H4
0C, QH! , ), C1oH21N (C2H4OH
) (CtH40[I]LHI!? ), CtaHs
yN(C2H40H) (CtHaOClaHst)
,C+5HsyN(busy tH1o) zHl((CyH
4(j t CtaHmJ , C+5HayN(CzH
aOH) ((CtHaO) tC18H3? ), Cl
aHsyN((CtHiO)aHH(C*H40) l
IC111H! ? 1, C+5HssN (C2H40H
) (CtH40C1@H31), C1@H37N(
CtH40Cl8H3? ) 2, Cl8H3? N((
CtHaO)2Cl8H3? 12, C, H, 7N
(C2H4H,OH) (CB,CHCH,OCR,
), CtaHs7N(CH2CHCH3OR) (CH
,CHCH,OC,. Hll), Cl8H37N(CH
2O(CH30Cl8H37)t Cl8H! 7N((
CH2CHCH30)2C18H3?12, Cl8H3
7N(CtH<OCl8H3?) (CH1a(CHI
OCl8H3? ), C10H21N (C2H4OH)
(CtH<0COCHs), CtoHaN(C2
H4OH) (C, H40COC, H,), C8°H,
,N (C,H40HI(CzHao coc 5H
H), C, oH, 1N (C, H, O)i) I
C, H, OC0CoH+r), C1oH21N (Ct
JOH) (CtH40COCl7H3!+),C,,
H8,N (C,H,5) (ClH40COCl7
H3!1 ), c+aHs'yN((C2H40) 2
HH(ctato) 2 COC,? H3111, C1
@H37N(C,H,0H)((C,H40%COC,
,H,,),C1@H37N((C2H40)6H)
((CtHaO)e COCl?H3S), Cl8H
311N(C2H40H)(C,H,OCOC,,I(
8,), C1@H37N(C,H,0COC5)1. ,
), ,C,,H,7N (C,H,0COC1,H
,,),,ClaHsyN(CHtCHCHsOH)(
al, CHCHsOCoa et al.), C,, H37N (σ
[,CHCH,0H)(CH,CHCH,OCOC,H
l. ), C,, H, 7N (CH, CHCH30CQC
,,H8,), ,C,8H8,N((CH,CHCH
,O) ,Co C,,H,,), ,C,,H,,
N (C,H,0COCs7Hss) (CHtCHC
HBOC1yH4s).

The method for producing the compound represented by the general formula [I] is not particularly limited; for example, the desired product can be obtained by reacting an adduct of a -grade alkylamine and ethylene oxide with a higher fatty acid.

When the compound represented by general formula [I] is produced industrially, RI, R1, RB, R4, R5% R6,
It is difficult to manufacture R7 and msn as pure compounds defined by strictly one structure or one numerical value, and it is usually manufactured as a mixture with different structures and/or numerical values. . In the present invention, there is no problem in using a mixture of compounds represented by the general formula CI].

If the content of the compound represented by formula [I] is less than 0.1 part by weight, the object of the present invention, which is to improve moldability and gloss while maintaining impact resistance, will not be achieved;
If the amount exceeds 1 part by weight, the effect not only becomes saturated, but also the stiffness of the resulting composition decreases, which is undesirable.

In the present invention, it is necessary that the content of the organic acidic substance contained in the rubber-containing styrenic resin is 0.5 inches or less, preferably O13 degrees or less.

Examples of the organic acidic substances mentioned here include higher fatty acids such as decanoic acid, dodecanoic acid, tetradecanoic acid, hexadecanoic acid, octadecanoic acid, and oleic acid, resin acids such as disproportionated rosin acid, dodecylbenzenesulfonic acid, and octadecylbenzenesulfone. acids, aromatic sulfonic acids such as dodecyl diphenyl ether disulfonic acid, octyl sulfonic acid, alkyl sulfonic acids such as f-sulfonic acid, dodecyl sulfonic acid, octadecyl sulfonic acid, octyl sulfate, decyl (IIIE acid, )”decyl sulfate, octadecyl sulfate, etc. and alkyl sulfates.

A composition comprising a rubber-containing styrenic resin containing more than 0.5% of an organic acidic substance and a compound represented by the general formula CI] has poor thermal stability; Local or overall discoloration is observed during melt mixing or molding, so the product value is significantly reduced. spoil.

When rubber-containing styrenic resin is manufactured by emulsion polymerization, it is common practice to add an acid such as hydrochloric acid, sulfuric acid, or acetic acid as a precipitating agent during the precipitation process to recover the resin from the latex obtained by polymerization. This operation converts the emulsifier into the corresponding organic acidic substance. Therefore, 1)
Neutralize the generated organic acidic substances.11) Use salts such as sodium chloride, potassium chloride, calcium chloride, magnesium sulfate, aluminum chloride, aluminum sulfate, etc. as precipitating agents.DI) Use acids and salts as precipitating agents. In order to reduce the content of organic acidic substances, it is necessary to reduce the content of organic acidic substances by reducing the amount of acid added.

Further, although it is common practice to add an organic acidic substance as a lubricant for a rubber-containing styrene resin, in the present invention, the amount of the organic acidic substance added is limited.

There are no particular restrictions on the method of mixing the rubber-containing styrenic resin and the compound of the general formula C1, and for example, each component in an emulsion, solution, melt, or particle state may be mixed to achieve the desired purpose. can be reached. More specifically, for example, when the compound of general formula CI) has a low melting point, it is possible to add the compound of general formula CI) to a rubber-containing styrenic resin latex and stir and mix at a temperature above the melting point. Alternatively, after mixing the rubber-containing styrenic resin powder and the compound of the general formula CI) in a powder mixing device such as a Henschel mixer or a tumbler, a mixtruder, an extruder, a Banbury mixer, or a coneater can be used. It is possible to obtain a composition by supplying it to a multi-layer melt mixing device.

Furthermore, in the present invention, lubricants, plasticizers, weathering agents,
Modifiers such as stabilizers, antistatic agents, fillers, reinforcing agents, colorants, flame retardants, etc. can be added. In particular, tridecyl 7-osphite, triotadecyl phosphite, monophenyldidecyl phosphite, diphenyl monodecyl phosphite, triphenyl phosphite, tri(nonylphenyl) phosphite, 4.4'-
Butylidene-bis(3-methyl-6-t-butylphenyl-di-hexadecyl)phosphite, 4.4'-
Isopropylidene-bis(monophenyl-di-decyl)
Addition of a phosphite such as phosphite, 4,4-isopropylidene-bis(neptanobuenyl-di-tetradecyl) phosphite is effective for improving thermal stability.

(Example) The effects of the present invention will be explained in more detail with reference to Examples below. Note that all parts and parts used in Examples and Comparative Examples are expressed on a weight basis.

[Reference example - Production of rubber-containing styrenic resin (referred to as component A)]

(Production of A-1, A-2, A-3, A-5, A-6) In the presence of the rubber latex shown in Table 1, the corresponding monomer ? It was manufactured by continuous addition and emulsion polymerization method.

A-1, A-2, A-3, and A-6 used potassium stearate as an emulsifier, and A-5 used sodium dodecylbenzenesulfonate as an emulsifier.

(Production of 8-4) A corresponding monomer was added to a toluene solution of EPDM to produce it by a solution polymerization method.

(Production of A-7) Produced by a suspension polymerization method. Relative viscosity ηrel = 1.46 at 1% by weight of methyl ethyl ketone and a temperature of 30°C
It is.

(Production of A-8 and A-9) Sodium dodecylbenzenesulfonate was used as an emulsifier and was produced by an emulsion polymerization method.

The compositions and emulsifier contents of A-1 to A-9 are summarized in Table 1. Note that the emulsifier content refers to the emulsifier content in the polymer.

(Compound of general formula [I] - component B and its abbreviations) Example 1 and Comparative Example i1 A-1 latex' in Table 1 was separated into a 2% calcium chloride aqueous solution and precipitated by heating to recover the resin. did.

The obtained A-1 powder, A-7 powder and '1B-1 to B-1
After mixing with 2 in a Henschel mixer, the mixture was fed to VC-40 (vented rate-screw extruder) manufactured by Chuo Kikai Urasakusho Co., Ltd. to obtain pellets.

A molded article was prepared using the obtained pellets, and the physical properties were evaluated to be on an order of magnitude, and the results are shown in Table 2.

Comparative Example 1 The stearic acid content in the pellets obtained in Experiment P&L18 was 0.05% or less.

As is clear from comparing Example 1 and Comparative Example 1, the general formula [
By adding the compound (ii), impact strength, fluidity and gloss are improved. In addition, the increase in yellowness is not to the extent that it poses a practical problem.

When an attempt was made to improve the impact strength due to an increase in the rubber content, a decrease in rigidity, fluidity and gloss was observed, demonstrating the superiority of the present invention.

Example 2 and Comparative Example 2 Latexes A-2, A-3, A-5 and A-6 in Table 1 were separated into a 2% aqueous calcium chloride solution and precipitated by heating to recover the resin.

The obtained component A, A-7 powder, and 1 kB-5 were mixed in a Henschel mixer, and then treated in the same manner as in Example 1 to obtain Beretsu) t-.

Further, after mixing A-4 powder with B-5 in a Henschel mixer, the mixture was treated in the same manner as in Example 1 to obtain pellets.

Using the obtained pellets, molded products were made and their physical properties were evaluated, and the results are shown in Table 3.

Regardless of the type of rubber component, the effect of adding the compound of general formula CI) was observed as in Example 1.

Note that the organic acidic substance content in the pellets of Experiments j'& L25 to L29 was all 0.05% or less.

Example 3 and Comparative Example 3 After mixing A-1 latex with A-8 latex or A-9 latex at the ratio shown in -A4, the resin was recovered in the same manner as in Example 1.

After mixing with the obtained powder eB-5 in a Henschel mixer, it was treated in the same manner as in Example 1 to obtain pellets. Using the obtained pellets, molded products were created and physical properties were evaluated, and the results were are shown in Table 4.

In Table 4, the part of component A indicates the number of parts as a polymer.

In addition, real W! The content of organic acidic substances in the pellets of Nos. &32 and No. 33 were both 0.05% or less.

Comparative Example 4 A-1, A-2, A-3, A-5 and A-6 latexes were heated and precipitated by boiling them in 5 liters of hydrochloric acid, and the latexes were recovered.

The obtained Component A and A-7 powder were mixed together with B-1 and B-5 Aluminum and B-11 in a Henschel mixer, and then treated in the same manner as in Example 1 to obtain pellets.

A molded article was made using the obtained pellets and the physical properties were evaluated, and the results are shown in Table 5.

The organic acid content of experiments N141, 42, 43, 44 and 45 was 0.62%, 0.87%, and 0.71%, respectively.
%, 1.45%, and 2.33 Ls.

It can be seen that when component B and an organic acidic substance coexist, the thermal stability of the resin is significantly impaired.

Example 4 and Comparative Example 5 When the sample of Example 1 Experiment N15 was mixed in a Henschel mixer, the amounts of stearic acid shown in Table 6 were added and pelletized.

A molded article was made using the obtained pellets and the physical properties were evaluated, and the results are shown in Table 6.

As the content of stearic acid increases, the degree of yellowness increases, and when the content is 0.5 inches or more, significant yellowing is observed. Experimental room 5
It can be seen that the yellowness of No. 1 is not large, and the significant increase in yellowness observed in experiment N150 is the result of the synergistic effect of component B and stearic acid.

Example 5 B-5 in 100 parts of A-1 latex (as polymer)
After adding &3 parts of powder and stirring at 80°C for 10 minutes, the resin was recovered according to Example 1.

26 parts of the obtained resin and 76 parts of A-7 powder were mixed in a Henschel mixer to form pellets.

As a result of evaluating the physical properties of the obtained pellets in the same manner as in Example 1, the flexural modulus was 27,100 Kf/d and the Izod impact strength was 11.2 Kgcm/e! n, Spiral Flow 523, Gloss Go 96 To, Gloss G,, 92%,
The yellowness was 6.4, and the stearic acid content was below oss.

Example 6 When mixing the samples of Example 1 and Experiment 5 using a Henschel mixer, tridecyl phosphite (P-1),
)su(nonylphenyl)phosphite (P-2), or 4,4'-isopropylidene-bis[monophenyl-dialkyl (C+V~C+a)]phosphite (P-3-ADEKA ARGUS CHEMICAL CO., LTD.) Made by MAR
K-1500) was added in an amount of 0.3 parts each, pelletized, and the physical properties were evaluated.

The results are shown in Shishi 7. As is clear from the comparison of the yellowness with Experiment Taki 5, the addition of the phosphite ester improves the thermal stability.

In addition, all the physical property measurement values of Examples and Comparative Examples were obtained by the following method.

l) Flexural modulus...ASTM D-7902) Izot impact strength...ASTM D-2563) Spiral 70-(flow length) As an index of moldability, injection molding was performed under certain conditions according to the method below. The flow length of the resin was measured.

Molding machine: Kawaguchi Churchill 040g manufactured by Kawaguchi Tekko Co., Ltd. Mold: Archimedean circle having a cross section obtained by bisecting an ellipse with a major axis of 5 - Otm and a minor axis of 4.6 cm along the major axis.

Molding conditions: Injection pressure: 50 Kf/cIiG cylinder temperature: 260°C Mold temperature: 40°C Measurement method: Evaluated as a free-flowing powder from the gate of the molded product
Measure the distance to the edge. The larger the flow length, the better the moldability.

4) Gloss and Yellowness The pellets were injection molded using a TS-80CN-■ injection molding machine manufactured by Toshiba Machine Co., Ltd. to produce a flat molded product measuring 60 x 100 x 3.0 mm. The molding conditions are as follows.

Molding conditions: Injection speed: 90 tm/see Cylinder temperature: 280°C Mold temperature: 50°C Residence time: 0 minutes, 10 minutes Here, residence time is the time for the molten resin to stay inside the cylinder, It is intended to reflect the thermal history that the resin undergoes during injection molding.

The gloss value of the obtained molded product was measured at an incident angle of 60 degrees using a Suga Test Instruments Co., Ltd. split digital variable angle gloss meter model UGV-4D. Gloss value at residence time 0 is GO5 residence time 1
The gloss value at 0 minutes was set to 01°. Even if Go is large, G,
. For resins with a small
Or the gloss value of the molded product obtained under injection molding conditions,
Global or local decline may be observed;
Practically unfavorable.

In addition, the yellowness of the molded product after a residence time of 0 minutes was measured using C0LORAND C0LORDIFFE manufactured by Nippon Denshoku Industries Co., Ltd.
RENCE METERMODEL ND-101DC
Measured using A resin with a high degree of yellowness is evaluated to have poor thermal stability. If a resin with poor thermal stability is subjected to injection molding, the hue may vary greatly due to variations in molding conditions, or the hue of the molded product may vary partially, which is extremely undesirable from a practical standpoint.

5) Organic acidic substance content [determination of stearic acid] Component A 5I and methyl ethyl ketone 50y were placed in a 100-meter Erlenmeyer flask with a stopper and shaken at room temperature for 8 hours.

The contents were dropped into 5 ooy of methanol.

The precipitate was filtered off, and the filtrate was concentrated to remove methanol.

50p of tetrahydro7ran was added to the residue, dissolved by heating, and an appropriate amount of an ether solution of diazomethane was added dropwise to esterify the stearic acid. After distilling off 1° excess of diazomethane, tetrahydrofuran was added dropwise to adjust the concentration to 5o-. Sample solution X was obtained.

Separately, a solution was prepared in which a known amount of methyl stearate was mixed with tetrahydrofuran to a constant volume of 50 g. This was injected into a gas chromatography system, and the relationship between the chromatographic peak area and methyl stearate concentration was graphed (
(Creating a calibration curve).

Pour the previous sample solution X into the gas chromatography,
The chromatographic peak area was determined, and the methyl stearate concentration was determined using a calibration curve.

Converted to methyl stearate weight tt stearic acid weight Sg contained in sample solution X, (S15) x 100 (%)
The stearic acid content in component A was defined as: Detection limit O, OS*.

[Quantitative determination of dotecylbenzenesulfonic acid] A acid component (g) and 50 g of methyl ethyl ketone were placed in a 1001 nt Erlenmeyer flask with a stopper and shaken at room temperature for 8 hours.

The contents were dropped into 500 g of methanol.

The precipitate was filtered, and a few drops of a methanol solution of phenolphthalein was added dropwise to the filtrate to prepare a sample solution Y.

A water/methanol solution of potassium hydroxide with a concentration of 0.01 normal was added to the sample solution YKfi, and neutralization titration was performed.

Separately, a blank test was conducted to determine the true titration value.

From the titration value, calculate the weight oye of dodecylbenzenesulfonic acid contained in the sample solution Y, and calculate (D15)
The content of dodecylhensensulfonic acid in component A was determined from K. Detection limit is 0.05t.

Table 7 (Effects of the Invention) The present invention provides a rubber-containing styrenic resin that has excellent impact resistance, moldability, gloss, and thermal stability.

These effects are achieved by adding a specific compound to the rubber-containing styrenic resin, and furthermore, by adding the specific compound, the content of organic acidic substances that impair the thermal stability of the resin is limited. This is achieved by

Patent Applicant: Denki Kagaku Kogyo Co., Ltd. Procedural Amendment April 9, 1985 1. Indication of the Case: 1985 Patent Application No. 49244 2. Name of the Invention: Thermoplastic Resin Composition 3. Person Making the Amendment: Related Patent Applicant Address 1-4-1 Yurakucho, Chiyoda-ku, Tokyo Contents of the amendment to Detailed Description of the Invention column 5° of the specification (1) Changed "upscale" from line 15 on page 2 of the specification to "upscale""It's become a thing," he corrected.

(2) “Special Publication No. 53-48 on page 3, line 15 of the specification
62" is corrected to "Special Publick Publication No. 53-4862J.

(3) "Yatrix" on page 4, line 12 of the specification is corrected to "matrix."

(4) [CBH37NJ on page 12, line 2 of the specification]
Corrected as 1eH3tN J.

(5) r' Cl0H31N on page 12, line 7 of the specification
Correct J to "C Yu. H2□N".

(6) "Type of additive amount" in Table 2 on page 36 of the specification is corrected to "type of additive."

Claims (1)

[Claims] 100 parts by weight of rubber-containing styrenic resin and general formula [I
] A thermoplastic resin composition characterized in that the content of organic acidic substances contained in the rubber-containing styrenic resin is 0.5% or less in a mixture with 0.1 to 10 parts by weight of the compound represented by thing. General formula [I] ▲There are mathematical formulas, chemical formulas, tables, etc.▼ [In the formula, R_1 is an alkyl group, R_2 and R_3 are each H or methyl group, and R_4 is an alkyl group or -C
(O)R_6 (R_6 is an alkyl group), R_5 is H, an alkyl group or -C(O)R_7 (R_7 is an alkyl group), m and n are each an integer of 1 to 20. ]