JP2021000734A - Resin composition for cleaning molding machine and extruder - Google Patents

Abstract

To provide a resin composition for cleaning which is excellent in cleaning performance and heat resistance and in which a generation of odor (styrene odor) and gas during work is suppressed.SOLUTION: A resin composition for cleaning of the present invention includes: (A) a styrene-acrylonitrile copolymer resin of 30 pts.mass to 90 pts.mass in which a melt mass flow rate (MFR) value under a condition of test temperature (θ) 220°C and nominal load (Mnom) 10 kg is 1 g/10 min to 40 g/10 min; and (B) a polycarbonate resin of 70 pts.mass to 10 pts.mass in which melt volume flow rate (MVR) value under a condition of test temperature (θ) 300°C and nominal load (Mnom) 1.2 kg is 3 cm3/10 min to 130 cm3/10 min. A total amount of pts.mass of component (A) and (B) is 100 pts.mass.SELECTED DRAWING: None

Description

The present invention relates to a resin composition for cleaning, particularly a resin composition for cleaning a molding machine and an extruder.

An injection molding machine melts, kneads, and plasticizes the raw material thermoplastic resin, so it is attached to a cylinder (sometimes called a heating cylinder or barrel), a screw built into it, and the tip of the cylinder. It is equipped with a nozzle or the like for discharging. The extrusion molding machine also includes a cylinder, a screw built therein, and a die attached to the tip of the cylinder to discharge the resin in order to melt, knead, and plasticize the raw material thermoplastic resin. When changing the thermoplastic resin used in the molding machine and the extruder, it is necessary to clean the inside of the cylinder, the screw, the nozzle or die, the vent portion and the like, in which case the cleaning resin composition is used.

The cleaning resin composition is required to have a high viscosity in order to extrude the thermoplastic resin remaining inside the cylinder, the screw and the like. As a cleaning resin composition satisfying such a requirement, a cleaning resin composition containing a styrene resin as a main component and an inorganic filler and a foaming agent added has been reported (see, for example, Patent Document 1). ..

Japanese Unexamined Patent Publication No. 05-069446

By the way, for example, when a thermoplastic resin such as a general-purpose plastic or an engineering plastic used at 220 ° C. or higher remains inside a cylinder or the like, a cleaning resin composition containing the above styrene resin as a main component is used. When the inside of the cylinder at a high temperature is washed, the viscosity of the cleaning resin composition is lowered and the shearing force is lowered, so that sufficient cleaning force cannot be obtained. Further, since the cleaning resin composition does not have sufficient heat resistance, there are problems related to worker safety such as generation of odor (styrene odor) and gas, and the cleaning resin composition that is thermally deteriorated by use at a high temperature There is a problem that it adheres to the cylinder or screw and stays there, which rather contaminates the molding machine or extruder. Therefore, it is a cleaning resin composition, particularly a cleaning resin composition for cleaning a molding machine or an extruder after engineering plastic molding, which is excellent in cleaning performance and heat resistance, and has an odor during work (styrene odor). Those that generate less gas are desired.

An object of the present invention is to provide a cleaning resin composition having excellent cleaning performance, purging property (replaceability) and heat resistance, and less generation of odor (styrene odor) and gas during work.

As a result of diligent studies, the present inventors have found that the above problems can be solved by using a combination of a specific styrene-acrylonitrile copolymer resin and a specific polycarbonate resin, and have completed the present invention. The gist of the present invention is as shown in [1] to [7] below.

[1] (A) 30 mass of styrene-acrylonitrile copolymer resin having a melt mass flow rate (MFR) value of 1 g / 10 min to 40 g / 10 min under the conditions of a test temperature (θ) of 220 ° C. and a nominal load (M _nom ) of 10 kg. parts to 90 parts by weight, and (B) test temperature (theta) 300 ° C., the value of the nominal load (M _nom) melt volume flow rate under the condition of 1.2 kg (MVR) is 3 cm ³ / 10min to 130 cm ³ / 10min A resin composition for cleaning, which comprises 70 parts by mass to 10 parts by mass of a certain polycarbonate resin, and the total of the parts by mass of the components (A) and (B) is 100 parts by mass.
[2] The cleaning resin composition according to [1], wherein the acrylonitrile content of the styrene-acrylonitrile copolymer resin is 5% by mass or more and less than 50% by mass.
[3] The cleaning resin composition according to [1], wherein the polycarbonate resin has a weight average molecular weight of 1.3 × 10 ^{4 to} 3.4 × 10 ⁴ .
[4] Described in any one of [1] to [3], which comprises 0 parts by mass to 10 parts by mass of a lubricant with respect to 100 parts by mass in total of the components (A) and (B). Cleaning resin composition.
[5] The cleaning resin composition according to any one of [1] to [4], which is used for cleaning a molding machine or an extruder.
[6] The cleaning resin composition according to [5], which is used for cleaning a molding machine or an extruder after molding a general-purpose plastic or engineering plastic of color grade or transparent grade.

Since the cleaning resin composition of the present invention contains a styrene-acrylonitrile copolymer resin having an MFR value of 1.0 g / 10 min to 40 g / 10 min as a main component, it has excellent swirling properties, such as inside a cylinder. When it is used for cleaning, it has good cleanability, and the thermoplastic resin remaining inside the cylinder, screw, etc. can be surely extruded, and has a sufficient cleaning effect. Further, since the value of MVR is added polycarbonate resin is 3 cm ³ / 10min to 130 cm ³ / 10min, excellent heat resistance, even when subjected to washing such as inside the cylinder at high temperature, the viscosity is low, There is no problem that the shearing force is reduced, and the thermoplastic resin remaining inside the cylinder, screw, etc. can be surely pushed out, and it has a sufficient cleaning effect. This enables efficient continuous production of molded products such as transparent grade, color grade, flame retardant grade, and fiber reinforced grade with stable quality.

In particular, the cleaning resin composition of the present invention contains a styrene-acrylonitrile copolymer resin as a main component, but by adding a polycarbonate resin, the viscosity is improved and the compatibility with engineering plastics is improved. High detergency can be expected. Further, by adding the polycarbonate resin, the content of the styrene-acrylonitrile copolymer resin, which is the source of the styrene odor, in the resin composition can be reduced, so that the generation of odor (styrene odor) and gas during work can be suppressed. Therefore, the cleaning resin composition of the present invention is extremely useful for cleaning a molding machine or an extruder, particularly for cleaning a molding machine or an extruder after molding a color grade or transparent grade general-purpose plastic or engineering plastic. is there.

Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the following embodiments, and can be arbitrarily modified and implemented without departing from the gist of the present invention.

<Component (A): Styrene-acrylonitrile copolymer resin>
The styrene-acrylonitrile copolymer (AS) resin used in the cleaning resin composition of the present invention has a melt mass flow rate (MFR) value of 1. under the conditions of a test temperature (θ) of 220 ° C. and a nominal load (M _nom ) of 10 kg. It is 0 g / 10 min to 40 g / 10 min. Examples of AS resins satisfying the MFR regulations include AS resin manufactured by Daicel Polymer Co., Ltd .: Sebian-N, AS resin manufactured by Asahi Kasei Co., Ltd .: Stylac, and AS resin manufactured by Nippon A & L Inc .: Lightac-A. AS resin manufactured by Techno Polymer Co., Ltd .: Sanlex and the like can be mentioned.

In the present invention, MFR can be measured based on ISO1133 or JIS K7210: 1999.

In the cleaning resin composition of the present invention, the content of the styrene-acrylonitrile copolymer resin is 30 parts by mass to 90 parts by mass and 40 parts by mass with respect to 100 parts by mass in total of the components (A) and (B). It is preferably parts to 80 parts by mass, and more preferably 50 parts to 70 parts by mass.

The styrene-acrylonitrile copolymer resin used in the cleaning resin composition of the present invention can be synthesized based on a known method, and for example, a polymerization method such as bulk polymerization, solution polymerization, or emulsion polymerization can be used. It may be appropriately selected depending on the purpose and application, but solution polymerization and bulk polymerization are industrially advantageous, and structural adjustment such as molecular weight is easy and preferable. As the polymerization mechanism, a polymerization method based on a mechanism such as radical polymerization, anion polymerization, cationic polymerization, or coordination polymerization can be used, but the polymerization method based on the radical polymerization mechanism is industrially advantageous. preferable. When polymerizing by a radical polymerization mechanism, it is industrially advantageous and preferable to use a thermal radical polymerization initiator that generates radicals by heat and a photoradical polymerization initiator that decomposes by light irradiation to generate radicals. The polymerization initiator is not particularly limited, and may be appropriately selected depending on the polymerization conditions such as the polymerization temperature, the solvent, and the type of the monomer to be polymerized, and these may be used alone. Two or more types may be used in combination. Further, a reducing agent such as a transition metal salt or amines may be used in combination with the polymerization initiator. If necessary, a chain transfer agent may be used, and it is more preferable to use it in combination with a radical polymerization initiator.

The styrene-acrylonitrile copolymer resin used in the cleaning resin composition of the present invention is specifically a random copolymer, a block copolymer, or a graft copolymer obtained by reacting styrene with acrylonitrile. However, the styrene content is preferably 50% by mass or more, and the acrylonitrile content is more preferably 5% by mass or more and less than 50% by mass.

The styrene-acrylonitrile copolymer resin may be in the form of flakes or pellets. For example, if necessary, the obtained styrene-acrylonitrile copolymer resin is isolated based on a well-known method, and then, for example, a well-known strand method cold-cut method (a styrene-acrylonitrile copolymer resin once melted is stranded. Formed into a shape, cooled, then cut into a predetermined shape and pelletized), hot-cut method in air (a styrene-acrylonitrile copolymer resin once melted, without contact with water in the air By the hot-cut method of the underwater hot-cut method (a method of cutting a styrene-acrylonitrile copolymer resin once melted in water and cooling it at the same time to pelletize it), both styrene-acrylonitrile Pellets of a copolymerized resin can be obtained. The obtained pellets of the styrene-acrylonitrile copolymer resin are preferably dried as appropriate based on a method such as drying using a hot air drying furnace, a vacuum drying furnace, or a dehumidifying drying furnace, if necessary.

Additives to styrene-acrylonitrile copolymer resins include antioxidants, phenolic, phosphorus, and sulfur heat stabilizers; benzotriazole and benzophenone UV absorbers; carboxylic acid esters, polysiloxane compounds, and paraffins. A mold release agent such as wax (polyolefin) or polycaprolactone; an antistatic agent or the like may be added.

Further, the styrene-acrylonitrile copolymer resin may be an injection molded product obtained by injection molding the styrene-acrylonitrile copolymer resin, or a crushed product obtained by crushing a sheet or film formed by melt extrusion molding. Alternatively, so-called recycled pellets obtained by melt-kneading the crushed product may be used.

<Component (B): Polycarbonate resin>
The polycarbonate (PC) resin used in the cleaning resin composition of the present invention has a melt volume flow rate (MVR) value of 3 cm under the conditions of a test temperature (θ) of 300 ° C. and a nominal load (M _nom ) of 1.2 kg. ³ is a / 10min to 130 cm ³ / 10min. The weight average molecular weight of the polycarbonate resin (M _W) is a high viscosity upon melting at a high temperature, from the viewpoint of reducing the tackiness of a metal, is 1.3 × 10 ⁴ to 3.4 × 10 ⁴ It is preferable, and it is more preferably 2.2 × 10 ^{4 to} 3.2 × 10 ⁴ .

In the present invention, MVR can be measured based on ISO1133 or JIS K7210: 1999. Furthermore, the weight average molecular weight of the resin (M _W) can be determined according to the method of measuring a standard polystyrene equivalent value by gel permeation chromatography (GPC method).

In the cleaning resin composition of the present invention, the content of the polycarbonate resin is 70 parts by mass to 10 parts by mass and 60 parts by mass to 20 parts by mass with respect to 100 parts by mass in total of the components (A) and (B). The amount is preferably 50 parts by mass to 30 parts by mass.

The polycarbonate resin used in the cleaning resin composition of the present invention can be synthesized based on a known method, and various synthesis including, for example, an interfacial polymerization method, a pyridine method, a transesterification method, and a ring-opening polymerization method of a cyclic carbonate compound. The method can be mentioned. Specifically, it is referred to as an aromatic dihydroxy compound or a small amount of a polyhydroxy compound thereof, carbonyl chloride generally known as phosgene, a carbonic acid diester typified by dimethyl carbonate or diphenyl carbonate, or carbon monoxide or carbon dioxide. It is a polymer or copolymer of a linear or branched aromatic polycarbonate obtained by reacting with a carbonyl compound.

As the raw material aromatic dihydroxy compound, for example, 2,2-bis (4-hydroxyphenyl) propane (= bisphenol A), 2,2-bis (4-hydroxy-3,5-dimethylphenyl) propane, 2,2 -Bis (4-hydroxy-3,5-diethylphenyl) propane, 2,2-bis [4-hydroxy- (3,5-diphenyl) phenyl] propane, 2,2-bis (4-hydroxy-3,5) -Dibromophenyl) propane, 2,2-bis (4-hydroxyphenyl) pentane, 2,4'-dihydroxy-diphenylmethane, bis- (4-hydroxyphenyl) methane, bis- (4-hydroxy-5-nitrophenyl) Methan, 1,1-bis (4-hydroxyphenyl) ethane, 3,3-bis (4-hydroxyphenyl) pentane, 1,1-bis (4-hydroxyphenyl) cyclohexane, bis (4-hydroxyphenyl) sulfone, 2,4'-Dihydroxydiphenylsulfone, bis (4-hydroxyphenyl) sulfide, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-dichlorodiphenyl ether, 4,4'-dihydroxy-2, 5-Diethoxydiphenyl ether, 1-phenyl-1,1-bis (4-hydroxyphenyl) ethane, 1,1-bis (4-hydroxy-3-methylphenyl) cyclohexane, 1-phenyl-1,1-bis (4-hydroxyphenyl) 4-Hydroxy-3-methylphenyl) ethane and the like can be mentioned. Among them, bis (4-hydroxyphenyl) alkanes are preferable, and 2,2-bis (4-hydroxyphenyl) propane is particularly preferable. In addition, these aromatic dihydroxy compounds can be used alone or in combination of two or more.

To obtain a branched polycarbonate resin, fluoroglucin, 4,6-dimethyl-2,4,6-tris (4-hydroxyphenyl) heptene-2, 4,6-dimethyl-2,4,6-tris ( 4-Hydroxyphenyl) heptene, 2,6-dimethyl-2,4,6-tris (4-hydroxyphenyl) heptene-3,1,3,5-tris (4-hydroxyphenyl) benzene, 1,1,1 -Polyhydroxy compound represented by tris (4-hydroxyphenyl) ethane or the like, or 3,3-bis (4-hydroxyaryl) oxyindole (= isatin bisphenol), 5-chloroisatin bisphenol, 5,7-dichloro Isatin bisphenol, 5-bromoisatin bisphenol and the like may be used as a part of the above-mentioned aromatic dihydroxy compound, and the amount used is preferably 0.01 to 10 mol%, more preferably 0.1 to 2 mol%. preferable.

In the reaction by the interfacial polymerization method, the pH is usually kept at 10 or more in the presence of an alkaline aqueous solution in an organic solvent inert to the reaction, and an aromatic dihydroxy compound and a molecular weight modifier (terminal terminator) are required. Depending on the situation, an antioxidant for antioxidant of the aromatic dihydroxy compound is used, and after reacting with phosgen, a polymerization catalyst such as a tertiary amine or a quaternary ammonium salt is added, and the polycarbonate is subjected to interfacial polymerization. A resin can be obtained. The addition of the molecular weight modifier is not particularly limited as long as it is between the time of phosgenation and the start of the polymerization reaction. The reaction temperature is 0 to 35 ° C., and the reaction time is several minutes to several hours.

Here, examples of the organic solvent inert to the reaction include chlorinated hydrocarbons such as dichloromethane, 1,2-dichloroethane, chloroform, monochlorobenzene and dichlorobenzene, and aromatic hydrocarbons such as benzene, toluene and xylene. it can. Examples of the molecular weight modifier (terminal arresting agent) include compounds having a monovalent phenolic hydroxyl group, and specifically, m-methylphenol, p-methylphenol, m-propylphenol, and p-propylphenol. , P-tert-butylphenol, p-long-chain alkyl-substituted phenol and the like. As the polymerization catalyst, tertiary amines such as trimethylamine, triethylamine, tributylamine, tripropylamine, trihexylamine, and pyridine; quaternary ammonium salts such as trimethylbenzylammonium chloride, tetramethylammonium chloride, and triethylbenzylammonium chloride, etc. Can be mentioned.

The reaction by the transesterification method is a transesterification reaction between a carbonic acid diester and an aromatic dihydroxy compound. Usually, the molecular weight and the terminal hydroxyl group amount of the desired polycarbonate resin are determined by adjusting the mixing ratio of the carbonic acid diester and the aromatic dihydroxy compound or adjusting the degree of reduced pressure during the reaction. The amount of terminal hydroxyl groups has a great influence on the thermal stability, hydrolysis stability, color tone, etc. of the polycarbonate resin. In order to give the polycarbonate resin practical physical properties, the amount of terminal hydroxyl groups is preferably 1000 ppm or less, more preferably 700 ppm or less. It is common to use an equal or more molar amount of carbonic acid diester with respect to 1 mol of the aromatic dihydroxy compound, and it is preferably used in an amount of 1.01 to 1.30 mol.

When synthesizing a polycarbonate resin by the transesterification method, a transesterification catalyst is usually used. The ester exchange catalyst is not particularly limited, but an alkali metal compound and / or an alkaline earth metal compound is mainly used, and a basic boron compound, a basic phosphorus compound, a basic ammonium compound, or an amine compound is supplementarily used. It is also possible to use basic compounds such as these in combination. In the transesterification reaction using such a raw material, the reaction is carried out at a temperature of 100 to 320 ° C., and finally, under reduced pressure of 2.7 × 10 ² Pa ( ² mmHg) or less, by-production of aromatic hydroxy compounds and the like is produced. Examples thereof include a method of performing a melt transesterification reaction while removing an object. The melt polycondensation can be carried out in a batch manner or continuously, but from the viewpoint of stability and the like, it is preferably carried out in a continuous manner. In the transesterification method, as the catalyst deactivator in the polycarbonate resin, it is preferable to use a compound that neutralizes the catalyst, for example, a sulfur-containing acidic compound, or a derivative formed from the compound, and the amount thereof is the alkali of the catalyst. It is added in the range of 0.5 to 10 equivalents, preferably 1 to 5 equivalents with respect to the metal, and usually in the range of 1 to 100 ppm, preferably 1 to 20 ppm with respect to the polycarbonate resin.

The polycarbonate resin may be in the form of flakes or pellets. The flakes of the polycarbonate resin can be obtained, for example, by dropping a dichloromethane solution containing the polycarbonate resin in the interfacial polymerization method into warm water maintained at 45 ° C. and evaporating and removing the solvent; the polycarbonate resin in the interfacial polymerization method. The dichloromethane solution containing the above can be put into methanol, the precipitated polymer can be filtered and dried; or the dichloromethane solution containing the polycarbonate resin by the interfacial polymerization method can be obtained by stirring with a kneader at 40 ° C. It can be obtained by stirring and pulverizing the mixture while maintaining the above temperature, and then removing the solvent with hot water at 95 ° C. or higher.

If necessary, after isolating the obtained polycarbonate resin based on a well-known method, for example, a well-known strand-type cold-cut method (a polycarbonate resin once melted is formed into a strand shape, cooled, and then formed into a predetermined shape. (Method of cutting into pellets), hot-cut method of hot-cut method in air (method of cutting polycarbonate resin once melted into pellets without touching water in the air), hot-cut method in water Pellets of polycarbonate resin can be obtained by a hot-cut method (a method of cutting a once melted polycarbonate resin in water and simultaneously cooling and pelletizing it). It is preferable that the obtained polycarbonate resin pellets are appropriately dried based on a method such as drying using a hot air drying oven, a vacuum drying oven, or a dehumidifying drying oven, if necessary.

Polycarbonate resins include antioxidants, phenolic, phosphorus, and sulfur-based heat stabilizers; benzotriazole-based and benzophenone-based UV absorbers; carboxylic acid esters, polysiloxane compounds, and paraffin wax (polyolefin-based). ), A mold release agent such as polycaprolactone; an antistatic agent or the like may be added.

Here, examples of the antioxidant include organic phosphorus compounds such as phenol-based antioxidants, hindered phenol-based antioxidants, bisphenol-based antioxidants, polyphenol-based antioxidants, organic sulfur compounds, and phosphite. .. Specifically, as a phenolic antioxidant, 2,6-di-tert-butyl-4-methylphenol, n-octadecyl-3- (3', 5'-di-tert-butyl-4'-hydroxy Phenyl) propionate, tetrakis [methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] methane, tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 4,4'-butylidenebis- (3-methyl-6-tert-butylphenol), triethylene glycol-bis [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate], 3,9- Bis {2- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] -1,1-dimethylethyl} -2,4,8,10-tetraoxaspiro [5,5 ] Undecan can be mentioned. In addition, as hindered phenolic antioxidants, pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-tert) -Butyl-4-hydroxyphenyl) propionate, thiodiethylenebis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], N, N'-hexane-1,6-diylbis [3-) (3,5-di-tert-butyl-4-hydroxyphenylpropionamide), 2,4-dimethyl-6- (1-methylpentadecyl) phenol, diethyl [[3,5-bis (1,1-dimethyl) Ethyl) -4-hydroxyphenyl] methyl] phosphonate, 3,3', 3 ", 5,5', 5" -hexa-tert-butyl-a, a', a "-(methicylene-2,4,6 -Triyl) tri-p-cresol, 4,6-bis (octylthiomethyl) -o-cresol, ethylenebis (oxyethylene) bis [3- (5-tert-butyl-4-hydroxy-m-tolyl) propionate ], Hexamethylenebis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 1,3,5-tris (3,5-di-tert-butyl-4-hydroxybenzyl) -1,3,5-triazine-2,4,6 (1H, 3H, 5H) -trione, 2,6-di-tert-butyl-4- (4,6-bis (octylthio) -1,3, 5-Triazin-2-ylamino) phenol and the like can be mentioned.

As a heat stabilizer, a phosphite ester compound (a) in which at least one ester in the molecule is esterified with phenol and / or a phenol having at least one alkyl group having 1 to 25 carbon atoms, phosphite ( b) and tetrakis (2,4-di-tert-butylphenyl) -4,4'-biphenylene-di-phosphonite (c) can be mentioned at least one selected from the group. Specific examples of the phosphite ester compound (a) include trioctylphosphite, tridecylphosphite, triphenylphosphite, tris (nonylphenyl) phosphite, tris (octylphenyl) phosphite, and tris (2,4-). Di-tert-butylphenyl) phosphite, tridecylphosphite, didecylmonophenylphosphite, dioctylmonophenylphosphite, diisopropylmonophenylphosphite, monobutyldiphenylphosphite, monodecyldiphenylphosphite, monooctyldiphenylphos Fight, distearyl pentaerythritol diphosphite, diphenylpentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, 2,2-methylenebis (4,6-methylenebis) Di-tert-butylphenyl) octylphosphite, bis (nonylphenyl) pentaerythritol diphosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert) −Butyl-4-ethylphenyl) Pentaerythritol diphosphite and the like can be mentioned. These may be used alone or in combination of two or more.

Specific examples of the ultraviolet absorber include inorganic ultraviolet absorbers such as cerium oxide and zinc oxide, as well as organic ultraviolet absorbers such as benzotriazole compounds, benzophenone compounds and triazine compounds. Of these, organic UV absorbers are preferred. In particular, benzotriazole compounds, 2- (4,6-diphenyl-1,3,5-triazine-2-yl) -5-[(hexyl) oxy] -phenol, 2- [4,6-bis (2,) 4-Dimethylphenyl) -1,3,5-triazine-2-yl] -5- (octyloxy) phenol, 2,2'-(1,4-phenylene) bis [4H-3,1-benzoxazine-4- On], [(4-Methoxyphenyl) -methylene] -propanedioic acid-dimethyl ester is preferably at least one selected from the group. Specific examples of the benzotriazole compound include 2-bis (5-methyl-2-hydroxyphenyl) benzotriazole, 2- (3,5-di-tert-butyl-2-hydroxyphenyl) benzotriazole, 2- (3'). , 5'-di-tert-butyl-2'-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3-tert-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (2'-Hydroxy-5'-tert-octylphenyl) benzotriazole, 2- (3,5-di-tert-amyl-2-hydroxyphenyl) benzotriazole, 2- [2-hydroxy-3,5-bis (Α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2,2'-methylene-bis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazole-2) -Il) phenol] [methyl-3- [3-tert-butyl-5- (2H-benzotriazole-2-yl) -4-hydroxyphenyl] propionate-polyethylene glycol] condensate and the like can be mentioned. Two or more of these may be used in combination. Among the above, preferably 2- (2'-hydroxy-5'-tert-octylphenyl) benzotriazole, 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl]- 2H-benzotriazole, 2- (4,6-diphenyl-1,3,5-triazine-2-yl) -5-[(hexyl) oxy] -phenol, 2- [4,6-bis (2,4) -Dimethylphenyl) -1,3,5-triazine-2-yl] -5- (octyloxy) phenol, 2,2'-methylene-bis [4- (1,1,3,3-tetramethylbutyl)- 6- (2H-benzotriazol-2-yl) phenol].

Examples of the light stabilizer include benzotriazole-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, triazine-based ultraviolet absorbers, oxanilide-based ultraviolet absorbers, malonic acid ester-based ultraviolet absorbers, and hindered amines. Specific examples of the light stabilizer include 2,2-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazole-2-yl) phenol], 2- ( 2-Hydroxy-5-tert-octylphenyl) benzotriazole, 2- (3-tert-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (5-methyl-2-hydroxyphenyl) ) Benzotriazole, 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2,2'-methylenebis (4-cumyl-6-benzotriazolephenyl), Examples thereof include p-phenylenebis (1,3-benzoxazine-4-one) and [(4-methoxyphenyl) -methylene] -malonic acid dimethyl ester.

Further, the polycarbonate resin may be an injection molded product obtained by injection molding a polycarbonate resin, or a crushed product obtained by crushing a sheet or film formed by melt extrusion molding, or the crushed product may be melted. So-called recycled pellets obtained by kneading may be used. Such a raw material may include a curable silicone resin film, an acrylic resin film, a metal vapor deposition film, etc. as a surface treatment film, but if it is 5 parts by mass or less with respect to the polycarbonate resin, it is contained. Can also be used.

<Other ingredients>
A lubricant may be added to the cleaning resin composition of the present invention. Here, as an example of the lubricant, at least one compound selected from the group of an aliphatic carboxylic acid, an ester of an aliphatic carboxylic acid and an alcohol, an aliphatic hydrocarbon compound having a number average molecular weight of 200 to 15,000, and a polysiloxane-based silicone oil. Can be mentioned. Examples of the aliphatic carboxylic acid include saturated or unsaturated aliphatic monovalent, divalent or trivalent carboxylic acids. Here, the aliphatic carboxylic acid also includes an alicyclic carboxylic acid. Among these, the preferred aliphatic carboxylic acid is a monovalent or divalent carboxylic acid having 6 to 36 carbon atoms, and an aliphatic saturated monovalent carboxylic acid having 6 to 36 carbon atoms is more preferable. Specific examples of aliphatic carboxylic acids include palmitic acid, stearic acid, caproic acid, caproic acid, lauric acid, araquinic acid, bechenic acid, lignoceric acid, cerotic acid, melissic acid, tetraliacontanic acid, montanic acid, adipic acid, Azelaic acid and the like can be mentioned. As the aliphatic carboxylic acid in the ester of the aliphatic carboxylic acid and the alcohol, the same one as the above-mentioned aliphatic carboxylic acid can be used. On the other hand, examples of the alcohol include saturated or unsaturated monohydric or polyhydric alcohols. These alcohols may have a substituent such as a fluorine atom or an aryl group. Among these, monohydric or polyhydric saturated alcohols having 30 or less carbon atoms are preferable, and aliphatic saturated monohydric alcohols or polyhydric alcohols having 30 or less carbon atoms are more preferable. Here, the aliphatic compound also includes an alicyclic compound. Specific examples of the alcohol include octanol, decanol, dodecanol, stearyl alcohol, behenyl alcohol, ethylene glycol, diethylene glycol, glycerin, pentaerythritol, 2,2-dihydroxyperfluoropropanol, neopentylene glycol, ditrimethylolpropane, dipentaerythritol and the like. be able to. The above ester compound may contain an aliphatic carboxylic acid and / or an alcohol as an impurity, or may be a mixture of a plurality of compounds. Specific examples of esters of aliphatic carboxylic acid and alcohol include beeswax (mixture containing myricyl palmitate as the main component), stearyl stearate, behenyl behenate, stearyl behenate, glycerin monopalmitate, and glycerin monostearate. , Glycerin distearate, glycerin tristearate, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, pentaerythritol tetrastearate and the like. Examples of the aliphatic hydrocarbon having a number average molecular weight of 200 to 15,000 include liquid paraffin, paraffin wax, microwax, polyethylene wax, Fischer-Tropsch wax, and α-olefin oligomer having 3 to 12 carbon atoms. Here, the aliphatic hydrocarbon also includes an alicyclic hydrocarbon. Moreover, these hydrocarbon compounds may be partially oxidized. Among these, paraffin wax, polyethylene wax or a partial oxide of polyethylene wax is preferable, and paraffin wax and polyethylene wax are more preferable. The number average molecular weight is preferably 200 to 5000. These aliphatic hydrocarbons may be a single substance or a mixture of various constituents and molecular weights, and the main component may be within the above range. Examples of the polysiloxane-based silicone oil include dimethyl silicone oil, phenyl methyl silicone oil, diphenyl silicone oil, and fluorinated alkyl silicone. Two or more of these may be used in combination.

The amount of the lubricant added is 0 parts by mass to 10 parts by mass, and preferably 0.1 parts by mass to 5 parts by mass with respect to 100 parts by mass in total of the components (A) and (B). By adding the lubricant, the thermoplastic resin remaining inside the cylinder or the like is easily peeled off or floated from the components such as the cylinder and the screw.

The cleaning resin composition of the present invention is excellent in cleaning performance and heat resistance even if it does not contain an inorganic filler or a foaming agent, but an inorganic filler may be added as the case may be. The inorganic filler preferably has a low iron content, acid content, or alkali content from the viewpoint of less thermal deterioration with respect to the resin component. Further, the shape of the filler is preferably needle-shaped or pulverized. The content of the inorganic filler is 0 parts by mass to 30 parts by mass with respect to 100 parts by mass in total of the components (A) and (B) from the viewpoint of its cleaning ability and high viscosity, and is 10 parts by mass to 30 parts. It is preferably parts by mass, more preferably 15 parts by mass to 25 parts by mass.

In addition, as inorganic fillers, glass fiber, carbon fiber, potassium titanate fiber, metal fiber, ceramic fiber, aramid fiber, PPS fiber, calcium sulfate, barium sulfate, titanium oxide, iron oxide, graphite, carbon black, mica, asbestos , Ceramic powder, metal flakes, plate-shaped glass, glass beads, calcium carbonate (CaCO ₂ ), magnesium silicate, calcium silicate (CaSiO ₃ ) and the like. Among them, glass fibers, calcium silicate, magnesium silicate, silicates such as silicate minerals such as wallastonite and zonotrite, mica, plate-shaped glass and glass beads are preferable, and cleaning ability and polycarbonate resin component are particularly preferable. Glass fiber or silicate is more preferable from the viewpoint of being able to suppress the decomposition of glass at high temperature.

Further, as the inorganic filler, those surface-treated with a silane coupling agent, a titanium-based coupling agent, or the like is preferable. Examples of the surface treatment agent include γ-aminopropyltrimethoxysilane, N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane, N-β- (aminoethyl) -γ-aminopropyldimethoxymethylsilane, and the like. Aminosilane-based, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane and other epoxysilane-based, isopropyltristearoyl titanate, isopropyltri Examples thereof include titanium-based coupling agents such as dodecylbenzenesulfonyl titanate and tetraisopropylbis (dioctylphosphite) titanate.

<Manufacturing of resin composition for cleaning>
The thermoplastic resin composition for cleaning of the present invention can be produced at the above-mentioned compounding ratio based on a mixing method practiced in the field of ordinary thermoplastic resins, for example, kneading with an extruder. At this time, all the components may be mixed at the same time, or a part of the components may be mixed in advance to produce a so-called masterbatch, and the masterbatch and the remaining components may be mixed. Further, in producing the cleaning thermoplastic resin composition of the present invention, in addition to the above-mentioned lubricant and inorganic filler, additives such as deterioration inhibitors and plasticizers generally added in the field of thermoplastic resins are used. , If necessary, it may be added as long as the effect of the cleaning resin composition of the present invention is not impaired. The composition thus obtained is usually molded into pellets, and is a molding method such as an injection molding method or an extrusion molding method generally used in the field of thermoplastic resins, and is a thermoplastic resin, particularly a general-purpose plastic or an engineering plastic. It is used as a cleaning agent for extruders and molding machines after molding transparent grade, color grade, flame retardant grade or fiber reinforced grade.

The thermoplastic resin composition for cleaning of the present invention is provided in an injection molding machine, and has a cylinder (heating cylinder, barrel) for melting, kneading, and plasticizing the raw material thermoplastic resin, and a screw built therein. , Attached to the tip of the resin, and can be used for cleaning nozzles and the like that discharge resin. Similarly, a heating cylinder provided in an extrusion molding machine for melting, kneading, and plasticizing a raw material thermoplastic resin, a screw built therein, a die attached to the tip thereof, and the like for discharging the resin, etc. Can be used for cleaning. Examples of the injection molding machine (injection molding apparatus) include known in-line screw type, plunger type, and screw / pre-pla type injection molding machines. Further, as the extruder, a well-known single-screw extruder including a vent type extruder and a tandem type extruder, and a well-known twin-screw extruder including a parallel type twin-screw extruder and a conical twin-screw extruder can be used. it can. In addition, the structure, construction and form of the die is essentially arbitrary.

Further, the resin composition of the present invention can be used for cleaning a molding machine or an extruder after molding a general-purpose plastic or engineering plastic of a transparent grade, a color grade, a flame retardant grade or a fiber reinforced grade. General-purpose plastics generally refer to inexpensive and readily available thermoplastics, such as polyethylene (PE), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC), acrylonitrile-butadiene-styrene ( ABS) resin, polymer blends thereof and the like can be mentioned, but the present invention is not limited thereto. Engineering plastics generally refer to plastics with excellent mechanical strength, such as polyacetal, polyamide, polycarbonate, modified polyphenylene ether, polybutylene terephthalate, ultrahigh molecular weight polyethylene, polysulfone, polyethersulfone, polyimide, polyetherimide. , Fluororesin, or a polymer blend thereof, and the like, but the present invention is not limited thereto.

Hereinafter, the present invention will be described based on examples, but the present invention is not limited to the examples, and various numerical values and materials in the examples are examples.

The components used in the examples and comparative examples of the present invention are as follows.
<Component (A): Styrene-acrylonitrile copolymer (AS) resin>
-Stylac (registered trademark) 783 (manufactured by Asahi Kasei Corporation); melt mass flow rate (MFR; measured at ISO 1133 under the conditions of test temperature (θ) 220 ° C. and nominal load (M _nom ) 10 kg) 9 g / 10 min.
-Sevian-N 080 (manufactured by Daicel Polymer Co., Ltd.); melt mass flow rate (MFR; measured at ISO 1133 under the conditions of test temperature (θ) 220 ° C. and nominal load (M _nom ) 10 kg) 17 g / 10 min.
<Component (B): Polycarbonate (PC) resin>
-Iupilon (registered trademark) E-2000 (manufactured by Mitsubishi Engineering Plastics Co., Ltd.); Melt volume flow rate (MVR; ISO 1133, test temperature (θ) 300 ° C., nominal load (M _nom ) 1.2 kg) in the measurement) 5.0cm ³ / 10min; weight average molecular weight (Mw) 2.8 × 10 ^4.
-Iupilon (registered trademark) S-3000 (manufactured by Mitsubishi Engineering Plastics Co., Ltd.); Melt volume flow rate (MVR; ISO 1133, test temperature (θ) 300 ° C., nominal load (M _nom ) 1.2 kg) in the measurement) 14cm ³ / 10min; weight average molecular weight (Mw) 22 × 10 ^4.
-Iupilon (registered trademark) H-4000 (manufactured by Mitsubishi Engineering Plastics Co., Ltd.); Melt volume flow rate (MVR; ISO 1133, test temperature (θ) 300 ° C., nominal load (M _nom ) 1.2 kg) in the measurement) 60cm ³ / 10min; weight average molecular weight (Mw) 1.7 × 10 ^4.
· Iupilon (registered trademark) (manufactured by Mitsubishi Engineering Plastics (Ltd.)) H-7000; (; predicted value from the fluidized value (Q value) MVR) 95cm ³ / 10min; melt volume flow rate weight average molecular weight (Mw) 1 .5 × 10 ⁴ .
<Other ingredients>
-Polyethylene wax (lubricant): Licowax PE 520 (manufactured by Clariant); powder.

[Example 1]
After dry-blending AS resin, PC resin and polyethylene (PE) wax for 20 minutes according to the blending amounts listed in Table 1 below, a twin-screw extruder (manufactured by Toshiba Machine Co., Ltd .; TEM-48SS; L / D = 38; Open vent + vent) was put into the main feeder all at once. The resin composition extruded from the strand die is cooled in a cooling water tank at a barrel set temperature of 200 ° C to 260 ° C, a screw (two-stage compression type) rotation speed of 300 rpm to 400 rpm, a discharge rate of 250 kg / h, and an extrusion temperature of 280 ° C to 300 ° C. After cooling with, it was sent to a strand cutter and cut into appropriate pellets (major axis 3 ± 0.5 mm, minor axis 2.5 ± 0.3 mm) to obtain pellets of a resin composition for cleaning.

[Examples 2 to 6, Comparative Examples 1 to 3]
Pellets of the resin composition for cleaning were prepared in the same manner as in Example 1 according to the composition and the blending amount shown in Table 1 below.

The cleaning performance of the cleaning resin composition of the present invention was evaluated according to the following test examples.

[Test Example 1: Extruder evaluation]
Using a 65 mm single-screw extruder (manufactured by Tanaka Co., Ltd.), under the conditions of extrusion temperature 260 ° C to 280 ° C, discharge rate 80 kg / h, and screw rotation speed 100 rpm, first, (1) red PC resin pellets (1) Upiron (registered trademark); manufactured by Mitsubishi Engineering Plastics Co., Ltd.), (2) White PC resin pellets (Upiron (registered trademark); manufactured by Mitsubishi Engineering Plastics Co., Ltd.), (3) Ivory-colored acrylonitrile / butadiene -Styrene (ABS) resin pellets (manufactured by Techno UMG Co., Ltd.) and (4) black PP resin pellets (manufactured by Nippon Polypro Co., Ltd.) were extruded. After each extrusion molding, as a cleaning test, extrusion cleaning was performed for 15 minutes (discharge rate 80 kg / h) using about 13 kg of the cleaning resin compositions of Examples 1 to 6 and Comparative Examples 1 to 3 respectively (each). 3 times), followed by purging (replacement) of the extruder with a transparent PC resin (Iupilon S-3000), and the cleaning performance of the resin composition for cleaning was very good (◎) from the following points. It was evaluated as good (○), slightly defective (Δ), and defective (×), respectively. The results are shown in Table 2.

(Cleanability)
The detergency was evaluated as follows based on the cleaning time of (1) red PC resin pellets, which took the longest time among the color grade resins (1) to (4) used.
⊚: Within 5 minutes after the start of cleaning, the resin used before cleaning becomes only the cleaning composition ○: Within 8 minutes after the start of cleaning, the resin used before cleaning becomes only the composition for cleaning △: Within 10 minutes after the start of cleaning, the resin used before cleaning is only the cleaning composition ×: The resin used before cleaning is only the composition for cleaning within 10 minutes after the start of cleaning. The resin compositions of Comparative Examples 1 to 3 were milky white, the resin compositions of Comparative Examples 1 and 2 had a pale yellow transparent color, and the resin compositions of Comparative Example 3 had a transparent color.

(Purgeability (replaceability))
To evaluate the purge property (replaceability), a pellet sample of transparent PC resin extruded after purging is molded into an evaluation plate (thickness 3 mm molded plate), and a haze meter (NDH4000 manufactured by Nippon Denshoku Kogyo Co., Ltd.) and It was carried out with a magnifying glass. When the haze value was 0.5% or less, which is the same value as the transparent PC resin before purging, and there was no white haze or foreign matter of 30 μm or more by the magnifying glass, it was evaluated as follows.
⊚: Only transparent PC resin is available within 5 minutes after the start of purging ○: Only transparent PC resin is available within 8 minutes after the start of purging Δ: Only transparent PC resin is available within 10 minutes after the start of purging ×: Only transparent PC resin is available in 10 minutes or more after the start of purging.

(Bite)
⊚: Stable discharge rate of more than the color grade resin used under the same extrusion conditions ○: Stable discharge rate of the same color grade resin used under the same extrusion conditions △: Under the same extrusion conditions , The discharge amount below the used color grade resin can be stably obtained. ×: The discharge amount below the color grade resin used fluctuates (pulsates) under the same extrusion conditions.

(Odor)
The degree of odor (irritating odor) felt by the operator during the cleaning test was evaluated as follows.
◎: No irritating odor (styrene odor) ○: Almost no irritating odor (styrene odor) △: Stimulating odor (styrene odor) ×: Strong irritating odor (styrene odor)

(Gas generation)
After heating the cleaning resin composition in a test tube at 280 ° C. for 5 minutes, the amount of gas adhering to the glass wall and the degree of discoloration were visually observed and evaluated as follows.
⊚: No discoloration / gas generation ○: Both discoloration / gas generation amount is small △: Discoloration is present, gas generation amount is small ×: Discoloration is large and gas generation amount is large

(Heat resistance (discoloration))
As for heat resistance (discoloration), the degree of discoloration is visually observed using an evaluation plate (thickness 3 mm molded plate) of a pellet sample of transparent PC resin extruded after purging, as in the evaluation of purge property (replaceability). It was observed and evaluated as follows.
⊚: Transparency higher than transparent PC resin ○: Same transparency as transparent PC resin △: Yellow discoloration ×: Brown discoloration

The cleaning resin compositions of Examples 1 to 6 were good or very good in the evaluation items of cleaning property, purging property, biting property and heat resistance. On the other hand, the cleaning resin compositions of Comparative Examples 1 and 2 containing the AS resin itself or the AS resin as a main component were generally good in the evaluation items of cleaning property, purging property and heat resistance, but evaluated the biting property. The item was slightly defective. The cleaning resin composition of Comparative Example 3 containing PC resin as a main component was slightly defective or defective in the evaluation items of cleanability and purge property, but the evaluation items of bite property and heat resistance were good. It was. In the evaluation items of odor (styrene odor) and gas generation, all of the cleaning resin compositions of Comparative Examples 1 and 2 (excluding Comparative Example 3 containing no styrene monomer) were defective, but Example 1 The cleaning resin compositions of No. 6 were slightly defective to well improved. As described above, the cleaning resin composition of the present invention is superior to the conventional products in terms of cleaning performance, heat resistance and workability.

[Test Example 2: Molding machine evaluation]
Using a molding machine (manufactured by Fanac Co., Ltd .; ROBOSHOT S-2000i 50A; 50t), first, under the conditions of cylinder temperature 260 ° C to 280 ° C, mold temperature 80 ° C, injection time 20 seconds, and screw rotation speed 70 rpm. , (1) Red PC resin pellets (Iupilon (registered trademark); manufactured by Mitsubishi Engineering Plastics Co., Ltd.), (2) White PC resin pellets (Iupilon (registered trademark); manufactured by Mitsubishi Engineering Plastics Co., Ltd.) , (3) Ivory-colored acrylonitrile-butadiene-styrene (ABS) resin pellets (manufactured by Techno UMG Co., Ltd.) and (4) black PP resin pellets (manufactured by Nippon Polypro Co., Ltd.) are injection molded by 20 shots each. did. After each injection molding, as a cleaning test, 20-shot injection molding was repeated (3 times each) using the cleaning resin compositions of Examples 1 to 6 and Comparative Examples 1 to 3, respectively, followed by a transparent PC resin. The injection machine was purged (replaced) with (Iupilon S-3000), and the cleaning performance of the cleaning resin composition was very good (◎), good (○), and slightly poor (△) from the following points. , And defective (x) were evaluated respectively. The results are shown in Table 3.

(Cleanability)
The detergency was evaluated as follows based on the cleaning time of (1) red PC resin pellets, which took the longest time among the color grade resins (1) to (4) used.
⊚: The resin used before cleaning is only the cleaning composition within 8 shots after the start of cleaning ○: The resin used before cleaning is only the composition within 10 shots after the start of cleaning △: Within 12 shots after the start of cleaning, the resin used before cleaning is only the cleaning composition ×: After the start of cleaning, the resin used before cleaning is only the composition for cleaning in 12 shots or more.

(Purgeability (replaceability))
To evaluate the purge property (replaceability), a pellet sample of transparent PC resin extruded after purging is molded into an evaluation plate (thickness 3 mm molded plate), and a haze meter (NDH4000 manufactured by Nippon Denshoku Kogyo Co., Ltd.) and It was carried out with a magnifying glass. When the haze value was 0.5% or less, which is the same value as the transparent PC resin before purging, and there was no white haze or foreign matter of 30 μm or more by the magnifying glass, it was evaluated as follows.
⊚: Only transparent PC resin is available within 5 shots after the start of purging ○: Only transparent PC resin is available within 8 shots after the start of purging Δ: Only transparent PC resin is available within 10 shots after the start of purging ×: After starting purging, only transparent PC resin will be available after 10 shots or more.

(Odor)
The degree of odor (irritating odor) felt by the operator during the cleaning test was evaluated as follows.
◎: No irritating odor (styrene odor) ○: Almost no irritating odor (styrene odor) △: Stimulating odor (styrene odor) ×: Strong irritating odor (styrene odor)

(Gas generation)
After heating the cleaning resin composition in a test tube at 280 ° C. for 5 minutes, the amount of gas adhering to the glass wall and the degree of discoloration were visually observed and evaluated as follows.
⊚: No discoloration / gas generation ○: Both discoloration / gas generation amount is small △: Discoloration is present, gas generation amount is small ×: Discoloration is large and gas generation amount is large

(Heat resistance (discoloration))
As for heat resistance (discoloration), the degree of discoloration is visually observed using an evaluation plate (thickness 3 mm molded plate) of a pellet sample of transparent PC resin extruded after purging, as in the evaluation of purge property (replaceability). It was observed and evaluated as follows.
⊚: Transparency higher than transparent PC resin ○: Same transparency as transparent PC resin △: Yellow discoloration ×: Brown discoloration

The cleaning resin compositions of Examples 1 to 3 were good or very good in the evaluation items of cleaning property, purging property and heat resistance. On the other hand, the cleaning resin compositions of Comparative Examples 1 and 2 containing the AS resin itself or the AS resin as the main component were also evaluated to be slightly defective in the evaluation items of cleanability, purge property and heat resistance. It was generally good. The cleaning resin composition of Comparative Example 3 containing PC resin as a main component was slightly defective or defective in the evaluation items of detergency and purgeability, but the evaluation items of heat resistance were good. In the evaluation items of odor (styrene odor) and gas generation, all of the cleaning resin compositions of Comparative Examples 1 and 2 (excluding Comparative Example 3 containing no styrene monomer) were defective, but Example 1 The cleaning resin compositions of No. 6 were slightly defective to well improved. As described above, the cleaning resin composition of the present invention is superior to the conventional products in terms of cleaning performance, heat resistance and workability.

Claims (6)

(A) Styrene-acrylonitrile copolymer resin having a melt mass flow rate (MFR) value of 1 g / 10 min to 40 g / 10 min under the conditions of a test temperature (θ) of 220 ° C. and a nominal load (M _nom ) of 10 kg is 30 parts by mass to 90 parts by mass. parts by weight, and (B) test temperature (theta) 300 ° C., the polycarbonate resin the value of the nominal load (M _nom) melt volume flow rate under the condition of 1.2 kg (MVR) is 3 cm ³ / 10min to 130 cm ³ / 10min A resin composition for cleaning, which comprises 70 parts by mass to 10 parts by mass of quality, and the total of the parts by mass of the components (A) and (B) is 100 parts by mass. The cleaning resin composition according to claim 1, wherein the acrylonitrile content of the styrene-acrylonitrile copolymer resin is 5% by mass or more and less than 50% by mass. The cleaning resin composition according to claim 1, wherein the polycarbonate resin has a weight average molecular weight of 1.3 × 10 ^{4 to} 3.4 × 10 ⁴ . The cleaning resin composition according to any one of claims 1 to 3, wherein 0 parts by mass to 10 parts by mass of a lubricant is contained with respect to 100 parts by mass of the total of the components (A) and (B). Stuff. The cleaning resin composition according to any one of claims 1 to 4, which is used for cleaning a molding machine or an extruder. The cleaning resin composition according to claim 5, which is used for cleaning a molding machine or an extruder after molding a color grade or transparent grade general-purpose plastic or engineering plastic.