JP2012062067A - Electric and electronic equipment component carrying case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric and electronic equipment component carrying case capable of preventing the deterioration of performance during carrying, and having excellent clean performance and dust-proof properties.SOLUTION: The electric and electronic equipment component carrying case uses a propylene-based resin material which is obtained by compounding 0.03-0.2 pt.wt. of a phenolic antioxidant with respect to 100 pts.wt. of a mixture comprising 85-99 wt.% of propylene-based resin produced by using a metallocene catalyst and 1-15 wt.% of a polymer antistatic agent and has 10 wt.ppm or lower of a volatile component and 20% or lower of a change rate of surface specific resistance after washing by using water.

Description

  The present invention relates to a case for transporting electrical and electronic equipment components, and more particularly, to a case for transporting electrical and electronic equipment components that is excellent in cleanliness and does not deteriorate in performance during transportation and is excellent in dust resistance of the case.

Propylene-based resins are widely used in various applications such as various industrial materials, various containers, daily necessities, films, and fibers because of their excellent heat resistance, moldability, transparency, and chemical resistance.
Various components such as silicon wafers, hard disks, disk substrates, IC chips, optical storage disks, high-performance substrate glass for LCDs, LCD color filters, hard disk magnetic head elements, CCD elements, etc. are used in electrical and electronic equipment. In assembling electrical and electronic equipment, in order to use these parts on an assembly line, it is necessary to transport and transfer these parts, and a transport case for this purpose is used. Conventionally, transport cases for thermoplastic resins such as polypropylene have been used for this purpose.

  In recent years, due to miniaturization, higher performance, and higher capacity of electrical and electronic equipment components, contaminants that occur and come into contact with the manufacturing environment, storage, and movement have become a factor in the yield, quality, and reliability of electrical and electronic equipment products. It has come to have a big influence. Volatile components derived from low-molecular-weight components and residual substances contained in the resin not only cause generation of smoke and off-flavors during processing, but may also adversely affect odor and hue after processing. As parts become finer, denser, and highly integrated, more sophisticated clean spaces are required.

Further, as electric and electronic equipment components are miniaturized, the adhesion of fine dust has become a problem. Although the adhesion of dust can be improved by adding an antistatic agent, the addition of the antistatic agent has not been realized because of the occurrence of volatile components derived from the antistatic agent and surface contamination.
As the antistatic agent, carbon black which is a conductive agent, and low molecular weight type antistatic agents such as glycerol stearate, alcohol and alkylamine which are surfactants are known. However, trays using such low molecular weight type antistatic agents exhibit antistatic performance when the antistatic agent bleeds, so that the electronic components are contaminated by the bleed antistatic agent, There was a problem that the prevention performance could not be maintained for a long time.

  And the problem that the frequency with which the malfunction in performance generate | occur | produces in the said components accommodated in the conveyance case has arisen. For example, there are problems such as malfunction of the storage disk caused by organic substances and acid gas adhering to the storage disk (for example, see Non-Patent Document 1). By suppressing the generation of organic pollutant gases and moisture generated from the resin material of the transport case, it is expected to prevent deterioration in product yield, storage and movement, and improve reliability.

  In order to solve such problems related to the polypropylene resin, a method of washing and removing low molecular weight components after polymerization (for example, see Patent Documents 1 and 2), and a method of separating and removing a liquid phase portion after bulk polymerization. (For example, refer to Patent Documents 3 and 4). However, the amount of oligomer components in the obtained resin and the amount of volatile components derived therefrom are sufficient to be sufficient by any method. The appearance of a propylene resin having excellent quality was desired.

Ultra-clean technology Toray Research Center (July 2005)

Japanese Examined Patent Publication No. 53-4107 Japanese Patent Publication No.58-41283 Japanese Patent Laid-Open No. 10-17612 Japanese Patent Laid-Open No. 10-17613

  The object of the present invention is that in the state of the prior art, the amount of volatile components is extremely small, and the electrical and electronic equipment is highly dustproof and highly productive without causing a performance degradation when transporting parts of the electrical and electronic equipment. It is to provide a case for parts conveyance.

  The inventors of the present invention have made extensive studies and have focused on the fact that trace gases such as hydrocarbons generated from the transport case material act on and deposit on the electrical and electronic equipment components to cause the above-mentioned problems. And, by adding a specific antistatic agent to a specific polypropylene resin at a predetermined ratio, the transport case using this has an amount of volatile components compared to the amount predicted from the material composition to be constructed. The present invention has been completed by finding that it is extremely small and that the performance is not deteriorated even during the transportation of electrical and electronic equipment parts, and that it is excellent in dust resistance.

  That is, according to the first aspect of the present invention, with respect to 100 parts by weight of a mixture of 85 to 99% by weight of a propylene-based resin and 1 to 15% by weight of a polymer type antistatic agent manufactured using a metallocene catalyst. The amount of volatile components is 10 ppm by weight or less, and the rate of change in surface resistivity after washing with water is within 20%. There is provided a case for transporting parts of electrical and electronic equipment, characterized by using a propylene-based resin material.

  According to a second aspect of the present invention, there is provided an electric and electronic equipment component carrying case according to the first aspect, wherein the polymer antistatic agent is a polyether / polyolefin block copolymer. Provided.

  According to a third invention of the present invention, in the first invention, the case for conveying parts of electrical and electronic equipment, wherein the elution amount of sodium and potassium of the propylene-based resin material is 10 ppm by weight or less, respectively. Is provided.

  Furthermore, according to the fourth aspect of the present invention, in the first aspect, the elution amount of sodium and potassium of the propylene-based resin material is 1 ppm by weight or less, respectively. Is provided.

  The case for transporting electrical and electronic equipment parts according to the present invention is extremely resistant to contamination of the contents compared to the conventional transport case, and does not cause performance deterioration during transport, and is excellent in cleanliness for transporting electrical and electronic equipment parts. A case can be provided, which is particularly useful for transporting semiconductors for highly integrated circuits.

The case for transporting electrical and electronic equipment parts according to the present invention comprises a propylene-based resin produced using a metallocene catalyst, and a specific amount of a polymer-type antistatic agent and a phenol-based antioxidant, respectively. This is characterized in that a propylene-based resin material having a specific amount of less than a specific amount and a rate of change in surface resistivity before and after washing with water of 20% or less is used.
Hereinafter, each component of the propylene-based resin material used in the electric and electronic equipment component carrying case of the present invention and a method for producing the electric and electronic equipment component carrying case will be described in detail.

[I] Component constituting propylene resin material (1) Propylene resin (A)
The propylene-based resin in the present invention means a homopolymer of propylene or a copolymer of propylene and ethylene and / or an α-olefin having 4 to 20 carbon atoms. Among them, a propylene homopolymer and a random copolymer of propylene and ethylene are preferable. In the case of a random copolymer of propylene and ethylene, the propylene unit is preferably 90 to 99.5 parts by weight, more preferably 92 to 99 parts by weight, and the ethylene unit is preferably 0.5 to 10 parts by weight, and more preferably 1 It comprises ~ 8 parts by weight.

  The propylene-based resin material used in the present invention needs to have a volatile component amount of 10 ppm by weight or less. For this reason, the propylene-based resin also needs to have a volatile component amount of 10 ppm by weight or less. Yes, preferably 8 ppm by weight or less, more preferably 6.5 ppm by weight or less. When the amount of the volatile component is more than 10 ppm by weight, the volatile component adheres to the electrical / electronic equipment component, resulting in an increase in the frequency of occurrence of malfunction in the component performance.

  The volatile component in the present invention is not particularly limited, but a volatile component resulting from a polymerization process of propylene such as an unreacted monomer, a low molecular weight compound, a polymerization solvent, a solvent, or an antioxidant. Examples thereof include volatile components resulting from various additives added to the polypropylene after polymerization.

There are many possible causes for the generation of volatile components, but they are often caused by differences in the polymerization method and production method of the propylene-based resin.
The propylene-based resin produced by the Ziegler catalyst can be obtained by measuring the weight average molecular weight (Mw) and the number average molecular weight (Mn) by GPC to obtain Mw / Mn (index of molecular weight distribution). However, the length of the propylene-based resin based on the metallocene catalyst is about 2 to 3, and the molecular chain length is very uniform. The content of relatively low molecular weight components such as unreacted monomers, dimers, low molecular weight compounds, amorphous components, oligomers and the like that are considered to cause generation of volatile components is usually 5 ppm or less, preferably 3 ppm or less, preferably Therefore, the use of a propylene-based resin with a metallocene catalyst can more easily suppress the generation of volatile components to 10 ppm by weight or less at the raw material stage.

  On the other hand, in the case of a propylene-based resin based on a Ziegler catalyst, the molecular weight distribution is relatively wide and potentially contains a low molecular weight range, so that the volatile component is a propylene-based resin, a so-called molding polymer raw material stage, It is often contained in large amounts such as 12 ppm, 16 ppm, and 19 ppm. Therefore, a propylene resin produced using a metallocene catalyst is used as the propylene resin material in the present invention.

  Of course, the volatile component is not only a by-product of propylene-based resin, but also a polymerization solvent, α-olefin such as ethylene, propylene, 1-butene and 1-hexene which are monomers used for copolymerization, catalyst, propane In addition, an inert saturated hydrocarbon solvent such as butane, pentane, hexane, and heptane, a polymer washing solution such as liquid α-olefin, and a polymer such as a recovery solvent may be mixed. Furthermore, since it can be assumed to be mixed from various additives such as antioxidants and processing aids, in order to reduce the volatile component of the propylene resin to 10 ppm by weight or less, polymerization, washing of the polymer, extraction, addition It is necessary to pay attention to measures from all processes and viewpoints including chemicals.

  The propylene-based resin used in the present invention preferably has a halogen content contained in the polymer, for example, a chlorine content of 10 ppm by weight or less, more preferably 5 ppm by weight or less. A large halogen content is not preferable because it exhibits corrosivity.

As described above, the propylene-based resin used in the present invention is produced using a metallocene catalyst.
As the metallocene catalyst, a known metallocene catalyst system can be used. Preferably, a catalyst system that does not use an organoaluminum oxy compound such as methylalumoxane or a fluorine-containing boron compound as a cocatalyst is used.
Polymerization using an aluminum oxy compound increases the amount of aluminum present in the resulting polymer, and polymerization using a fluorine-containing boron compound increases the amount of halogen present in the generated polymer. In order to obtain the above-mentioned propylene-based resin having a preferable halogen content, the load of the catalyst removal step must be very large, which is not practical.

The metallocene catalyst is preferably a supported type.
A particularly preferred example of the supported metallocene catalyst is an ion-exchange layered silicate in which the carrier also functions as a promoter. Specifically, it is obtained by combining the component [A], the component [B] described below and the component [C] added as necessary.

Component [A] Metallocene complex Group 4-6 transition metal compound having at least one conjugated five-membered ring ligand Component [B] Cocatalyst Ion exchange layered silicate Component [C] Organoaluminum compound

-Component [A] Metallocene complex As said component [A], specifically, the compound represented by the following general formula [I] can be used.
^{_{Q (C 5 H 4-a}} R 1 a) (C 5 H 4-b R 2 b) MXY ··· [I]
In the general formula [I], Q represents a binding group that bridges two conjugated five-membered ring ligands.
M represents a group 4-6 transition metal of the periodic table, and titanium, zirconium, and hafnium are particularly preferable.
X and Y are each independently hydrogen, a halogen group, a hydrocarbon group having 1 to 20 carbon atoms, an oxygen-containing hydrocarbon group having 1 to 20 carbon atoms, a nitrogen-containing hydrocarbon group having 1 to 20 carbon atoms, carbon A phosphorus-containing hydrocarbon group having 1 to 20 carbon atoms or a silicon-containing hydrocarbon group having 1 to 20 carbon atoms is shown.

R ¹ and R ² are each independently a hydrocarbon group having 1 to 20 carbon atoms, a halogen group, a halogen-containing hydrocarbon group having 1 to 20 carbon atoms, an alkoxy group, an aryloxy group, a silicon-containing hydrocarbon group, A phosphorus-containing hydrocarbon group, a nitrogen-containing hydrocarbon group or a boron-containing hydrocarbon group is shown. Further, two adjacent R ¹ or two R ² may be bonded to each other to form a C4 to C10 ring. In particular, it is preferable to form a 6-membered ring or a 7-membered ring and to form an indene ring or an azulene ring together with the conjugated 5-membered ring.
a and b are integers satisfying 0 ≦ a ≦ 4 and 0 ≦ b ≦ 4.
Examples of the binding group Q that bridges between two conjugated five-membered ring ligands include an alkylene group, an alkylidene group, a silylene group, and a germylene group. These may be those in which a hydrogen atom is substituted with an alkyl group, halogen or the like. In particular, a silylene group is preferable.

Specific examples of the metallocene complex include the following compounds.
(1) Methylenebis (cyclopentadienyl) zirconium dichloride (2) Methylene (cyclopentadienyl) (3,4-dimethylcyclopentadienyl) zirconium dichloride (3) Isopropylidene (cyclopentadienyl) (3,4 -Dimethylcyclopentadienyl) zirconium dichloride (4) ethylene (cyclopentadienyl) (3,5-dimethylpentadienyl) zirconium dichloride (5) methylenebis (indenyl) zirconium dichloride (6) ethylenebis (2-methylindene) Nyl) zirconium dichloride (7) ethylene 1,2-bis (4-phenylindenyl) zirconium dichloride (8) ethylene (cyclopentadienyl) (fluorenyl) zirconium dichloride

(9) Dimethylsilylene (cyclopentadienyl) (tetramethylcyclopentadienyl) zirconium dichloride (10) Dimethylsilylene bis (indenyl) zirconium dichloride (11) Dimethylsilylene bis (4,5,6,7-tetrahydroindenyl ) Zirconium dichloride (12) Dimethylsilylene (cyclopentadienyl) (fluorenyl) Zirconium dichloride (13) Dimethylsilylene (cyclopentadienyl) (octahydrofluorenyl) zirconium dichloride (14) Methylphenylsilylene bis [1- ( 2-methyl-4,5-benzo (indenyl)] zirconium dichloride (15) dimethylsilylenebis [1- (2-methyl-4,5-benzoindenyl)] zirconium dichloride (16) dimethyl chloride Renbis [1- (2-methyl-4H-azurenyl)] zirconium dichloride (17) dimethylsilylenebis [1- (2-methyl-4- (4-chlorophenyl) -4H-azurenyl)] zirconium dichloride (18) dimethylsilylene Bis [1- (2-ethyl-4- (4-chlorophenyl) -4H-azurenyl)] zirconium dichloride (19) Dimethylsilylenebis [1- (2-ethyl-4-naphthyl-4H-azurenyl)] zirconium dichloride

(20) Diphenylsilylenebis [1- (2-methyl-4- (4-chlorophenyl) -4H-azurenyl)] zirconium dichloride (21) Dimethylsilylenebis [1- (2-methyl-4- (phenylindenyl)] ] Zirconium dichloride (22) Dimethylsilylenebis [1- (2-ethyl-4- (phenylindenyl))] zirconium dichloride (23) Dimethylsilylenebis [1- (2-ethyl-4-naphthyl-4H-azurenyl) ] Zirconium dichloride (24) Dimethylgermylenebis (indenyl) zirconium dichloride (25) Dimethylgermylene (cyclopentadienyl) (fluorenyl) zirconium dichloride In addition, other fourth, fifth, and sixth compounds such as titanium compounds and hafnium compounds. Group transition metal compounds A compound similar to the above is preferably mentioned. These compounds may be used in combination for the catalyst component and catalyst of the present invention.

Component [B] cocatalyst (ion-exchange layered silicate)
The ion-exchange layered silicate is not limited to a natural product, and may be an artificial synthetic product.
A clay compound can be used as the ion-exchange layered silicate. Specific examples of the clay compound include, for example, the following described in Harakuo Shiramizu “Clay Mineralogy” Asakura Shoten (1995): Examples include layered silicates.
(1) Kaolin group such as dickite, nacrite, kaolinite, anorokite, metahalloysite, halloysite, etc., and serpentine group such as chrysotile, lizardite, antigolite, etc., whose 1: 1 type structure is the main constituent layer (2) Montmorillonite, sauconite, beidellite, nontronite, saponite, hectorite, stevensite and other smectites, vermiculite such as vermiculite, mica, illite, sericite, sea chlorite Mica, such as attapulgite, sepiolite, palygorskite, bentonite, pyrophyllite, talc, chlorite group

The silicate used in the present invention may be a layered silicate in which the mixed layers (1) and (2) are formed.
In the present invention, the main component silicate is preferably a silicate having a 2: 1 type structure, more preferably a smectite group, and particularly preferably montmorillonite.

The activity can be improved by chemically treating these silicates with an acid, salt, alkali, oxidizing agent, reducing agent, organic solvent or the like.
In addition to removing impurities on the surface of the ion-exchange layered silicate particles or exchanging interlayer cations, the acid treatment may elute some or all of the cations such as Al, Fe, and Mg in the crystal structure. it can.
Examples of the acid used in the acid treatment include hydrochloric acid, nitric acid, sulfuric acid and the like, preferably an inorganic acid, particularly preferably sulfuric acid.
The acid treatment conditions are not particularly limited, but preferably 5 to 50 parts by weight of an aqueous acid solution is reacted at a temperature of 60 to 100 ° C. for 1 to 24 hours, and the acid concentration is changed during the reaction. May be. After the acid treatment, washing is usually performed. Washing is an operation for separating and removing the acid contained in the treatment system from the ion-exchangeable layered silicate.

As the salt used in the salt treatment, it is preferable to select and use a salt containing a specific cation. As for the kind of the cation, a monovalent to tetravalent metal cation is preferable, and a cation of Li, Ni, Zn, or Hf is particularly preferable.
Specific examples of the salts include the following.
Examples of the cation with Li include LiCl, LiBr, Li ₂ SO ₄ , Li ₃ (PO ₄ ), Li (ClO ₄ ), Li ₂ (C ₂ O ₄ ), LiNO ₃ , Li (OOCCH ₃ ), Li ₂ (C ₄ H ₄ O ₄ ) and the like.
Examples of the cation that is Ni include NiCO ₃ , Ni (NO ₃ ) ₂ , NiC ₂ O ₄ , Ni (ClO ₄ ) ₂ , NiSO ₄ , NiCl ₂ , and NiBr ₂ .
Examples of the cation with Zn include Zn (OOCH ₃ ) ₂ , Zn (CH ₃ COCHCOCH ₃ ) ₂ , ZnCO ₃ , Zn (NO ₃ ) ₂ , Zn (ClO ₄ ) ₂ , Zn ₃ (PO ₄ ) ₂ , ZnSO ₄ , ZnF ₂ , ZnCl ₂ , ZnBr ₂ , ZnI _{2 and the} like can be mentioned.
As those cations of _{Hf, Hf (OOCCH 3) 4} , Hf (CO 3) 2, Hf (NO 3) 4, Hf (SO 4) 2, HfOCl 2, HfF 4, HfCl 4, HfBr 4, HfI ₄ etc. can be mentioned.

  After the chemical treatment, drying is performed. In general, the drying temperature can be 100 to 800 ° C., and high temperature conditions (for example, 800 ° C. or more depending on the heating time) that cause structural destruction are as follows. It is not preferable. Since the characteristics change depending on the drying temperature even if the structure is not destroyed, it is preferable to change the drying temperature according to the application. The drying time is usually 1 minute to 24 hours, preferably 5 minutes to 4 hours, and the atmosphere is dry air, dry nitrogen, dry argon, or reduced pressure. It does not specifically limit regarding a drying method, It can implement by various methods.

Component [C] Organoaluminum Compound The organoaluminum compound of component [C] is a component that is optionally used as necessary, and a compound represented by the following general formula [II] is suitable.
(AlR ⁴ _p X _3-p ) _q ... [II]
In formula [II], R ⁴ represents a hydrocarbon group having 1 to 20 carbon atoms, and X represents a halogen, hydrogen, an alkoxy group, or an amino group. p is an integer of 1 to 3, and q is an integer of 1 to 2.
R ⁴ is preferably an alkyl group, and X is preferably an alkoxy group having 1 to 8 carbon atoms when it is an alkoxy group, and an amino group having 1 to 8 carbon atoms when it is an amino group.
Of these, trialkylaluminum and dialkylaluminum hydride having p = 3 and q = 1 are preferable. More preferably, R ⁴ is a trialkylaluminum having 1 to 8 carbon atoms.

  The organoaluminum compounds can be used alone, in combination of two or more, or in combination. The organoaluminum compound can be added and used not only at the time of catalyst preparation but also at the time of preliminary polymerization or main polymerization.

The metallocene catalyst used in the present invention is preferably pre-polymerized before the main polymerization. As monomers used for the prepolymerization, α-olefins such as ethylene, propylene, 1-butene and 1-hexene, diene compounds such as 1,3-butadiene, and vinyl compounds such as styrene and divinylbenzene can be used. .
This prepolymerization is preferably carried out under mild conditions in an inert solvent, and is 0.01 to 1,000 g, preferably 0.1 g, per gram of the solid catalyst (total of component [A] and component [B]). It is desirable to carry out such that ~ 100 g of polymer is produced.

  The polymerization reaction is performed in the presence or absence of an inert hydrocarbon such as butane, pentane, hexane, heptane, toluene, cyclohexane, or a solvent such as a liquefied α-olefin. In the present invention, it is desirable to increase the amount of polymer produced per solid catalyst (when the solid catalyst is prepolymerized, the polymer produced by the prepolymerization is not included). In order to increase the polymer production amount, it is desirable to set both the polymerization temperature and the polymerization pressure higher.

Usually, the polymerization temperature is selected from 60 to 90 ° C., and the polymerization pressure is selected from about 1.5 to 4 MPa. In particular, in the case of bulk polymerization, the polymerization temperature is preferably 60 to 80 ° C., and the polymerization pressure is preferably selected from about 2.5 to 4 MPa in correlation with the temperature. On the other hand, in the case of gas phase polymerization, the polymerization temperature is preferably 70 to 90 ° C., and is preferably selected from about 1.5 to 4 MPa.
Furthermore, it is possible to increase the polymer production amount per solid catalyst by increasing the residence time of the solid catalyst, but if it is too long, the productivity will be affected. The preferred residence time is 1 to 8 hours, more preferably 1 to 6 hours. It is desirable to set the polymerization conditions so that the polymer production amount per 1 g of the solid catalyst including the carrier is 20 kg or more, preferably 25 kg or more, more preferably 30 kg or more.
Further, hydrogen may be present as a molecular weight regulator in the polymerization system. Furthermore, the polymerization may be carried out in multiple stages by changing the polymerization temperature, the concentration of the molecular weight regulator and the like.

In the present invention, after completion of the polymerization, the obtained propylene-based resin is more preferably used with an inert saturated hydrocarbon solvent such as propane, butane, pentane, hexane, heptane, liquid α-olefin, or the like, and more preferably with 3 carbon atoms. Alternatively, washing is preferably performed using an inert hydrocarbon solvent or a liquid α-olefin.
The washing method is not particularly limited, and a known method such as decantation of the supernatant after the contact treatment in the stirring tank, countercurrent washing, and separation from the washing solution by a cyclone can be used.
Moreover, you may add a quenching agent before washing | cleaning or simultaneously with washing | cleaning. The quenching agent is not particularly limited, and water, alcohols such as methanol, ethanol and isopropanol, ketones such as acetone and methyl ethyl ketone, or a mixture thereof can be used.

(2) Polymer type antistatic agent (B)
The polymer type antistatic agent (B) is an antistatic agent having at least two or more repeating units. Preferably, for example, a polymer type antistatic agent having a number average molecular weight of 1,000 or more is used. However, there is no limitation even with nonionic, cationic or anionic polymer type antistatic agents.

Of these, nonionic ones are preferred, and polymer antistatic agents having hydrophilic segments and having antistatic properties imparted by the hygroscopicity of the hydrophilic segments are particularly preferred.
As such a polymer type antistatic agent, a lipophilic polymer / hydrophilic polymer block copolymer such as a polyether / polyolefin block copolymer is preferably exemplified.
In the polyether / polyolefin block copolymer, the polyether block functions as a hydrophilic segment, and the polyolefin block functions as a lipophilic segment. That is, the hydrophilic segment has an effect of lowering the surface resistance of the molded body due to its hygroscopicity, and the lipophilic segment has an effect of enhancing the compatibility with the propylene-based resin as a base material, and thus is particularly excellent. Antistatic agent.
Examples of the polyether constituting the polyether / polyolefin block copolymer include polyether diol, polyether diamine, modified products thereof, and a polyether-containing hydrophilic polymer. The polyether-containing hydrophilic polymer includes a polyether ester amide having a polyether diol segment, a polyether amide imide having a polyether diol segment, a polyether ester having a polyether diol segment, and a polyether diamine segment. And polyether urethanes having polyether diol or polyether diamine segments.

Examples of the oxyalkylene group constituting the polyether include an ethylene group, a propylene group, a trimethylene group, and a tetramethylene group, which are oxyalkylene groups having 2 to 4 carbon atoms of alkylene. The proportion of the oxyethylene group in the oxyalkylene chain constituting the polyether is preferably 5% by mass or more, more preferably 10 to 100% by mass, and still more preferably 60 to 100% by mass from the viewpoint of improving antistatic properties. %. The number average molecular weight of the polyether is preferably 150 to 20,000.
The polyolefin constituting the polyether / polyolefin block copolymer is preferably a polyolefin obtained by polymerizing at least one selected from olefins having 2 to 30 carbon atoms, more preferably by polymerizing at least one of ethylene and propylene. The resulting polyolefin.

The average number of repeating units of the polyether block and the polyolefin block constituting the polyether / polyolefin block copolymer is preferably 2 to 50, more preferably considering the action of imparting antistatic properties. It is 2.3-30, More preferably, it is 2.7-20, Most preferably, it is 3-10. This average number of repetitions can be determined by the method described in Patent Document 3.
The ratio of the polyether constituting the polyether / polyolefin block copolymer is preferably 20 to 90% by mass, more preferably 25 to 80% by mass, and still more preferably based on the total mass of the polyether and polyolefin. 30 to 70% by mass.
The number average molecular weight of the polyether / polyolefin block copolymer is preferably 2,000 to 60,000, more preferably 5,000 to 40,000, and still more preferably 8,000 to 30,000.

The polymer type antistatic agent (B) to be used is preferably used in such a range that the volatile components from the polymer type antistatic agent and the elution amount of sodium and potassium ions are not problematic.
By using such a polymer type antistatic agent, the dispersibility with the propylene-based resin is improved, the moldability is excellent, and the antistatic property of the molded body is improved over a long period of time.

The number average molecular weight of the polymer type antistatic agent (B) is preferably 1,000 to 100,000, more preferably 2,000 to 60,000, and still more preferably 3,000 to 30,000.
Examples of such a polymer type antistatic agent include “Pelestat” (trade name, manufactured by Sanyo Chemical Industries) and “Statlite” (trade name, manufactured by The Lubrizol Corporation).

  The addition amount of the polymer type antistatic agent is in the range of 1 to 15 parts by weight. More preferably, it is the range of 5-10 weight part. If the addition amount of the polymer type antistatic agent is less than 1 part by weight, it is not suitable because sufficient antistatic performance cannot be obtained. When the addition amount of the polymer type antistatic agent exceeds 15 parts by weight, the strength of the molded product is lowered, the volatile components are increased, and the production cost is further increased.

(3) Phenolic antioxidant (C)
Various phenolic antioxidants are blended in the propylene resin material used in the present invention. Specific examples of phenolic antioxidants include 2,6-di-t-butyl-4-methylphenol (butylated hydroxytoluene), tetrakis [methylene-3- (3,5-di-t- Butyl-4-hydroxyphenyl) propionate] methane, octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, 1,1,3-tris (2-methyl-4 -Hydroxy-5-t-butylphenyl) butane, 2- [1- (2-hydroxy-3,5-di-t-pentylphenyl) ethyl] -4,6-di-t-pentylphenyl acrylate 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene and the like can be preferably exemplified.
Other antioxidants can be used in combination as long as the effects of the present invention are not impaired. However, when an antioxidant containing phosphorus and sulfur is used, the contained phosphorus and sulfur have an adverse effect on the contents. This is undesirable because it may impair product performance.

  The amount of the phenolic antioxidant (C) added is in the range of 0.03 to 0.2 parts by weight with respect to 100 parts by weight of the propylene resin. When the addition amount of the phenolic antioxidant is less than 0.03 parts by weight, deterioration of polypropylene due to heat cannot be prevented, and the amount of volatile components increases. When the addition amount exceeds 0.2 parts by weight, there is a concern about the generation of outgas derived from the antioxidant, the production cost is increased, and the color of the product may be deteriorated. In addition, if the blending amount is increased, not only the semiconductor contents are directly contaminated by blooming but also it may be recognized as a volatile component.

Moreover, it is desirable that the lower limit of the amount (parts by weight) of the phenolic antioxidant used in the present invention is adjusted so as to satisfy the following formula with respect to 100 parts by weight of the propylene-based resin.
3 × 10 ⁻³ T−0.67
(However, the unit is parts by weight, and T is the molding temperature (° C.). Also, a value less than 0.03 is 0.03.)
This is because, in the injection molding, when obtaining the electric / electronic device component carrying case of the present invention, it is necessary to increase the molding temperature when the case is large, thin, or complicated. However, the higher the molding temperature is, the more the thermal deterioration is promoted and the volatile components are increased. Therefore, a large amount of phenolic antioxidant is required. On the other hand, the more the phenolic antioxidant is added, the worse the hue becomes. Therefore, when the moldability, the amount of volatile components and the hue required for practical use of the product are taken into consideration, the addition amount of the phenolic antioxidant represented by the above formula is most effective. Here, the molding temperature refers to the cylinder set temperature of the (injection) molding machine.

(4) Other components In the range which does not impair the effect of this invention remarkably, the propylene-type resin material used for this invention can also mix | blend another additional arbitrary component. Examples of such optional components include an antifogging agent, a metal deactivator, an ultraviolet absorber, a dispersant, a filler, a flame retardant, a colorant, a pigment, and a fluorescent brightening agent.

(II) Properties of propylene-based resin material The propylene-based resin material used in the present invention is required to have a volatile component amount of 10 ppm by weight or less, preferably 8 ppm by weight or less, more preferably 6% by weight. ppm or less. When the amount of the volatile component is more than 10 ppm by weight, the volatile component adheres to the electrical / electronic equipment component, resulting in an increase in the frequency of occurrence of malfunction in the component performance.
In addition, about the measuring method of a volatile component, it carries out by the method detailed in the postscript Example.

Further, the propylene-based resin material needs to have a change rate of the surface resistivity after being washed with water within 20%. If the surface specific resistance value after washing with water exceeds the surface resistance value before washing by more than 20%, the antistatic performance is not maintained. If the antistatic property is lost by washing with water, there is a concern that the antistatic property required when the container is washed and used repeatedly cannot be obtained. As a result, dust adheres to the contents because the dust resistance is insufficient. The rate of change of the surface resistivity before and after washing with water is preferably within 10%, more preferably within 5%, and particularly preferably within 5%.
In addition, about the measuring method of surface specific resistance change rate, it carries out by the method detailed in the postscript Example.

The elution amount of sodium and potassium of the propylene-based resin material is preferably 10 ppm by weight or less, more preferably 5 ppm by weight or less, more preferably 3 ppm by weight or less, and particularly preferably 1 ppm or less. This is because when the elution amount of sodium and potassium increases, when the case touches the contents stored in the case for transporting parts of electrical and electronic equipment, the electrical characteristics change at that portion, and the possibility that the contents are damaged is increased.
In addition, about the measuring method of sodium and potassium elution amount, it carries out by the method detailed in the postscript Example.

(III) Molding method of carrying case In order to manufacture the electric and electronic equipment component carrying case of the present invention, the propylene-based resin material containing the above-described additive in the propylene-based resin described above is prepared by a known method. Molded into a desired shape case by injection molding or the like. The transfer case includes various forms such as various magazines, trays, boxes, and containers.
Here, the electric and electronic device parts are not particularly limited, but examples thereof include silicon wafers, hard disks, disk substrates, IC chips, magneto-optical disks (MO), DVDs, BDs, various memories, high-performance substrate glasses for LCDs, It refers to parts for various electrical and electronic equipment such as LCD color filters, hard disk magnetoresistive heads, CCDs, CCD devices, and optical equipment semiconductor parts.

EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated in detail, this invention is not limited by these Examples.
In the following examples and comparative examples, the physical properties of the polymers are measured according to the following methods.

(1) Melt flow rate (MFR) of propylene resin:
It measured based on JIS-K6921-2: 1997 appendix (230 degreeC, 21.18N load).
(2) Ethylene content of propylene resin:
The ethylene unit content (unit: parts by weight) in the polymer derived from ethylene comonomer was measured by pressing the obtained polymer and molding it into a sheet by the IR method. Specifically, it was calculated from the peak height derived from the methylene chain observed at around 730 cm ⁻³ .

(3) Volatile component amount:
A 200 mg sample was filled into a GERSTEL TDS tube, the TDS tube was inserted into a GERSTEL TDS-A device, heated at 100 ° C. for 30 minutes while flowing helium gas, and the gas was filled with TENAX during the heating time. The volatile components generated from the sample were collected by being introduced into CIS4 and cooling CIS4 to -150 ° C.
The collected components were introduced into the gas chromatogram by rapid heating and vaporization to 320 ° C. The introduced gas was measured by gas chromatogram / mass spectrometry under the following conditions.
Device: HP6890
Column: DB-5ms 0.25mm x 30m
Temperature: 40 ° C. × 5 min → 10 ° C./min to 300 ° C. × 15 min
Detector: HP5973N
The amount of hydrocarbons was determined by measuring aliphatic straight-chain saturated hydrocarbons having 20 carbon atoms at concentrations of 1, 5 and 10 μg / ml under the same conditions as the sample using n-heptane as a solvent, and gas chromatogram / mass. Measurement was performed by an analytical method, a calibration curve was prepared, and quantification was performed in terms of an aliphatic straight-chain saturated hydrocarbon having 20 carbon atoms.

(4) Surface resistivity:
A Hiresta IP high resistivity meter (MCP-HT260) manufactured by Dia Instruments Co., Ltd. was used, the applied voltage was 10 V, and the electrode was a double ring method (HRS probe). The value 10 seconds after voltage application was adopted as the measured value.
The sheet-like molded bodies obtained in each Example / Comparative Example were measured before and after washing with water.
In the table of results, OR (overrange) has a value higher than 10 ¹³ Ω, indicating that measurement is not possible.

(5) Elution Na, K amount:
High purity nitric acid for electronic industry (manufactured by Mitsubishi Chemical Corporation) was diluted with ultrapure water to prepare 1.0 × 10 ⁻³ N nitric acid. Place 20 mL of this nitric acid into a tetrafluoroethylene test tube with an internal volume of about 80 mL washed with ultrapure water, and lightly cover the top opening with a tetrafluoroethylene stopper washed with ultrapure water. It heated at 80 degreeC in the oil bath for 1 hour so that the part which does not contain nitric acid might not be heated. Next, this nitric acid solution was taken out into a platinum dish and gradually heated in a quartz tube infrared heating furnace in a nitrogen atmosphere to be dried. To the residue on the platinum plate, 1.0 mL of high-purity hydrochloric acid for electronics industry is added, dissolved, diluted with ultrapure water, and then Na, K of high-resolution ICP-MS (manufactured by ThermoQuest) is used. Elemental content was measured.

(6) Haze:
Measurement was performed according to JIS K7105 using an injection test piece having a thickness of 2 mm.

(Production Example 1)
(1) Preparation of catalyst The following operations were carried out under inert gas using deoxygenated and dehydrated solvents and monomers.
(I) Chemical treatment of ion-exchange layered silicate Acid treatment:
Add 1130 g of distilled water and 750 g of 96% sulfuric acid to a Zeparable flask, keep the internal temperature at 90 ° C., add 300 g of granulated smectite (Menzawa Chemical Co., Ltd. Benclay SL) and react for 5 hours. I let you.
Washing:
The mixture was cooled to room temperature in 1 hour and washed with distilled water to pH = 3.69. The washing magnification at this time was 1 / 10,000 or less. The solid at this stage was partially dried, and the elution rate by acid treatment was determined to be 33.5%.
Salt treatment:
211 g of lithium sulfate monohydrate was dissolved in 521 g of distilled water, and 100 g (dry weight) of the solid obtained by the acid treatment was further added, followed by stirring at room temperature for 120 minutes. This slurry was filtered, 3000 g of distilled water was added to the obtained solid, and the mixture was stirred for 5 minutes at room temperature. Further, this slurry was filtered. Distilled water 2500g was added to the obtained solid, and it filtered again after stirring for 5 minutes. This operation was repeated four more times. The obtained solid was preliminarily dried at 130 ° C. for 2 days under a nitrogen stream, and then coarse particles of 53 μm or more were removed and further dried under reduced pressure at 200 ° C. for 2 hours to obtain chemically treated smectite.

(Ii) Silicate activation treatment 200 g of the above chemically treated smectite was introduced into a glass reactor equipped with a stirring blade having an internal volume of 3 L, 750 ml of normal heptane, and a heptane solution of trinormal octyl aluminum (500 mmol). And stirred at room temperature. After 1 hour, the mixture was washed with normal heptane (residual liquid ratio less than 1%) to prepare a slurry of 2000 mL.

(Iii) Preparation of prepolymerization catalyst Next, (r) -dimethylsilylenebis [2-methyl-4- (4-chlorophenyl) -4H-azurenyl] zirconium dichloride 3 mmol toluene slurry 870 mL and triisobutylaluminum (15 mmol) A mixed solution obtained by reacting 42.6 mL of a heptane solution in advance at room temperature for 1 hour was added to the above chemically treated smectite slurry and stirred for 1 hour. Then, normal heptane 2.1L was introduce | transduced into the stirring type autoclave of internal volume 10L fully substituted with nitrogen, and it hold | maintained at 40 degreeC. The previously prepared montmorillonite / complex slurry was introduced there. When the temperature was stabilized at 40 ° C., propylene was supplied at a rate of 100 g / hour, and the temperature was maintained. After 4 hours, the propylene feed was stopped and maintained for another 2 hours. About 3 L of the supernatant was removed from the recovered prepolymerized catalyst slurry, 170 mL of a heptane solution of triisobutylaluminum (30 mmol) was added, stirred for 10 minutes, and then heat-treated at 40 ° C. under reduced pressure. By this operation, a prepolymerized catalyst containing 2.30 g of polypropylene per 1 g of catalyst was obtained.

(2) Production of propylene-based resin From a liquid phase polymerization tank with an internal volume of 270 L, a deactivation tank with an internal volume of 400 L, a slurry circulation pump, a circulation line hydraulic classifier, a concentrator, a countercurrent pump, and a washing liquid receiving tank Propylene-ethylene copolymer by a process incorporating a post-treatment system including a deactivation cleaning system, a high pressure degassing system comprising a double tube heat exchanger and a fluidized flash tank, and a low pressure degassing tank and a dryer. Was continuously produced.
The prepolymerized catalyst produced above was dispersed in liquid paraffin (trade name “White Rex 335” manufactured by Tonen Co., Ltd.) at a concentration of 15 parts by weight and introduced into the liquid phase polymerization tank at 0.35 g / hr as a catalyst component. Furthermore, liquid propylene was supplied to this polymerization tank at 40 kg / hr, ethylene at 0.4 kg / hr, hydrogen at 0.25 g / hr, and triisobutylaluminum at 18 g / hr, and the internal temperature was maintained at 70 ° C. Then, polymerization was performed. A mixed slurry of polymer and liquid propylene was extracted from the liquid phase polymerization tank into a deactivation washing tank so as to be 12.0 kg / hr as a polymer. At this time, the average residence time of the catalyst in the polymerization tank was 1.3 hours. Ethanol was supplied to the deactivation washing tank at 21.0 g / hr as a deactivation agent. Furthermore, liquid propylene was supplied at 40 kg / hr, and the internal temperature was kept at 50 ° C. by heating with a jacket. The polymer was extracted from the lower part of the classifier into a high-pressure degassing tank, further passed through a low-pressure degassing tank, and dried with a dryer. The internal temperature of the dryer was adjusted to 80 ° C. and the residence time was 1 hour, and dry nitrogen at room temperature was further flowed in the countercurrent direction of the powder flow at a flow rate of 12 m ³ / hr. The dried polymer was removed from the hopper.
On the other hand, liquid propylene separated from the polymer through a classifier and a concentrator was extracted into a washing liquid receiving tank at 40 kg / hr. The yield of the obtained polymer per 1 g of the solid catalyst was 34.3 kg, ethylene content = 0.75 wt%, MFR = 30.6 g / 10 min, and Tm = 141.7 ° C.

(Production Example 2)
(1) Catalyst adjustment (i) Ziegler catalyst adjustment A 100 L reactor equipped with a stirring blade, thermometer, jacket and cooling coil was charged with Mg (OEt) ₂ : 30 mol, and then Ti (OBu) ₄ was added. The Mg (OEt) ₂ was charged so that the molar ratio of Ti (OBu) ₄ / Mg was 0.60 with respect to magnesium in the charged Mg (OEt) ₂ . Furthermore, 19.2 kg of toluene was charged, and the temperature was raised while stirring. After reacting for 3 hours at 139 ° C., and cooled to 130 ° C., the toluene solution of MeSi _{(OPh) 3,} with respect to the magnesium of the charged Mg _{(OEt) 2} previously, MeSi _(OPh) 3 / Mg The molar ratio was 0.67. The amount of toluene used here was 7.8 kg. After completion of the addition, the reaction was performed at 130 ° C. for 2 hours, and then the temperature was lowered to room temperature, and Si (OEt) ₄ was added. The addition amount of Si _{(OEt) 4,} to the magnesium in the charged Mg _{(OEt) 2} previously, the molar ratio of Si _(OEt) 4 / Mg was set to be 0.056.

Next, toluene was added to the obtained reaction mixture so that the magnesium concentration was 0.57 (mol / L · TOL). Furthermore, diethyl phthalate (DEP) was added so that the molar ratio of DEP / Mg was 0.10 with respect to magnesium in Mg (OEt) ₂ charged previously. The resulting mixture was cooled to −10 ° C. with continued stirring, and TiCl ₄ was added dropwise over 2 hours to obtain a uniform solution. Incidentally, TiCl _4, relative to the magnesium of the charged Mg _{(OEt) 2} previously was such that the molar ratio of TiCl ₄ / Mg is 4.0. After completion of the addition of TiCl ₄ , the temperature was raised to 15 ° C. at 0.5 ° C./min with stirring, and kept at the same temperature for 1 hour. Next, the temperature was raised again to 50 ° C. at 0.5 ° C./min and held at that temperature for 1 hour. Further, the temperature was raised to 118 ° C. at 1 ° C./min, and the treatment was performed at the same temperature for 1 hour. After completion of the treatment, stirring was stopped and the supernatant liquid was removed, followed by washing with toluene so that the residual liquid ratio = 1/73 to obtain a slurry.

Next, toluene and TiCl ₄ were added to the resulting slurry at room temperature. Incidentally, TiCl _4, relative to the magnesium of the charged Mg _{(OEt) 2 previously,} the molar ratio of TiCl 4 / Mg _{(OEt) 2} was set to be 5.0. Toluene was prepared so that the TiCl ₄ concentration was 2.0 (mol / L · TOL). The slurry was heated with stirring and reacted at 118 ° C. for 1 hour. After completion of the reaction, stirring was stopped and the supernatant liquid was removed, followed by washing with toluene so that the residual liquid ratio = 1/150 to obtain a solid component slurry. Furthermore, 400 g of the solid component obtained above was transferred to another reactor having a stirring blade, a thermometer, and a cooling jacket, and normal hexane was added to give a solid component concentration of 5.0 (g / l). ). While stirring the resulting slurry, trimethylvinylsilane, triethylaluminum (TEA) and t-butylmethyldiethoxysilane (TBMDES) were added at 15 ° C. The addition amounts of TEA, trimethylvinylsilane, and TBMDES are 3.1 (mmol), 0.2 (ml), and 0.2 (ml) with respect to 1 g of the solid component in the solid component, respectively. I made it. After completion of the addition, the mixture was kept at 15 ° C. for 1 hour with continuous stirring, further heated to 30 ° C., and stirred at the same temperature for 2 hours.

(Ii) Preliminary polymerization Next, the temperature was lowered again to 15 ° C., and while maintaining the same temperature, 1.2 kg of propylene gas was fed at a constant rate to the gas phase part of the reactor over 72 minutes to perform preliminary polymerization. went. After completion of the feed, stirring was stopped and the supernatant liquid was removed, followed by washing with normal hexane to obtain a slurry of a prepolymerized catalyst component. The remaining liquid ratio was 1/12. The obtained prepolymerization catalyst component had 3.1 g of propylene polymer per 1 g of the solid component.

(2) Production of Propylene Resin Polymerization was carried out using the same reactor system used in Production Example 1. The prepolymerized catalyst component obtained above was dispersed in liquid paraffin (trade name “White Rex 335” manufactured by Tonen Co., Ltd.) at a concentration of 2 parts by weight and introduced as a catalyst component at 0.2 g / hr. In this reactor, liquid propylene was 32.8 kg / hr, ethylene was 0.26 kg / hr, hydrogen was 4.0 g / hr, triethylaluminum was 6.6 g / hr, and t-butylmethyldiethoxysilane (TBEDMS) was 0. Polymerization was carried out while continuously feeding at 0.011 g / hr and maintaining the internal temperature at 70 ° C.
A mixed slurry of polymer and liquid propylene was extracted from the liquid phase polymerization tank into a deactivation washing tank so as to be 13.8 kg / hr as a polymer. At this time, the average residence time of the catalyst in the polymerization tank was 1.3 hours. Ethanol was supplied to the deactivation washing tank at 21.0 g / hr as a deactivation agent. Furthermore, liquid propylene was supplied at 40 kg / hr, and the internal temperature was kept at 50 ° C. by heating with a jacket. The polymer was extracted from the lower part of the classifier into a high-pressure degassing tank, further passed through a low-pressure degassing tank, and dried with a dryer. The internal temperature of the dryer was adjusted to 80 ° C. and the residence time was 1 hour, and dry nitrogen at room temperature was further flowed in the countercurrent direction of the powder flow at a flow rate of 12 m ³ / hr. The dried polymer was removed from the hopper. On the other hand, liquid propylene separated from the polymer through a classifier and a concentrator was extracted into a washing liquid receiving tank at 40 kg / hr. The yield of the obtained polymer per 1 g of the solid catalyst was 69.0 kg, and the ethylene content was 4.2 wt. %, MFR = 25.5 g / 10 min, and Tm = 140.1 ° C.

<Antistatic agent>
The antistatic agents used in the following Examples / Comparative Examples are as follows.
(I) Polymer type antistatic agent-1:
Polyether / Polyolefin Block Copolymer Product name “Pelestat HC250” manufactured by Sanyo Chemical Industries
(Ii) Polymeric antistatic agent-2:
Polyether / Polyolefin block copolymer Trade name “Pelestat 201” manufactured by Sanyo Chemical Industries
(Iii) Polymer antistatic agent-3:
Polyether-based thermoplastic polyurethane Product name "Statlite X5567" manufactured by The Lubrizol Corporation
(Iv) Antistatic agent-4: (for comparative example)
Glycerol monostearate Product name “Electro Stripper TS5” manufactured by Kao Corporation

Example 1
(1) Production of Resin Material 95 parts by weight of the propylene-based resin powder obtained by Production Example 1 using the metallocene catalyst, 5 parts by weight of the above-described antistatic agent-1, and pentaerythryl-tetrakis [3 -(3,5-t-butyl-4-hydroxyphenyl) propionate] (trade name “RA1010” manufactured by Ciba Specialty Chemicals, hereinafter abbreviated as “RA1010”) is added in an amount of 0.03 part by weight, and the super mixer is added. After nitrogen sealing, the mixture was mixed for 3 minutes. After that, the powder was granulated at a cylinder temperature of 200 ° C., a screw rotation speed of 150 rpm, and an extrusion rate of 15 kg / h using a twin-screw extruder (TEM 35) manufactured by Toshiba Machine Co. Pellets were obtained.
This pellet was molded into a sheet-like molded product having a size of 100 mm × 100 mm and a thickness of 2 mm under the conditions of a cylinder temperature of 200 ° C. and a mold temperature of 40 ° C. using an IS100GN molding machine manufactured by Toshiba Machine Co., Ltd. Surface specific resistance, Na and K elution amounts, and haze were measured. Further, the obtained sheet molded body was washed with water and dried, and the surface resistivity was measured.
The obtained results are shown in Table 1.

(Example 2)
A resin material and an injection-molded body were obtained in the same manner as in Example 1 except that the ratio of the propylene-based resin powder obtained in Production Example 1 was 90 parts by weight and that of Antistatic Agent-1 was 10 parts by weight.
The obtained results are shown in Table 1.

Example 3
A resin material and an injection-molded body were obtained in the same manner as in Example 1 except that the proportion of the propylene-based resin powder obtained in Production Example 1 was 85 parts by weight and that of Antistatic Agent-1 was 15 parts by weight.
The obtained results are shown in Table 1.

Example 4
A resin material and an injection-molded body were obtained in the same manner as in Example 1 except that the ratio of the propylene-based resin powder obtained in Production Example 1 was 90 parts by weight and the amount of antistatic agent-2 was 10 parts by weight.
The obtained results are shown in Table 1.

(Example 5)
A resin material and an injection-molded body were obtained in the same manner as in Example 1 except that the ratio of the propylene-based resin powder obtained in Production Example 1 was 90 parts by weight and the amount of antistatic agent-3 was 10 parts by weight.
The obtained results are shown in Table 1.

(Comparative Example 1)
A resin material and an injection-molded body were obtained in the same manner as in Example 2 except that the propylene-based resin powder obtained by the Ziegler-based catalyst obtained in Production Example 2 was used. The obtained results are shown in Table 1.

(Comparative Example 2)
A resin material and an injection-molded body were obtained in the same manner as in Example 1 except that the proportion of the propylene-based resin powder obtained in Production Example 1 was 80 parts by weight and that of Antistatic Agent-1 was 20 parts by weight.
The obtained results are shown in Table 1.

(Comparative Example 3)
In the same manner as in Example 1 except that the ratio of 99.85 parts by weight of the propylene-based resin powder obtained in Production Example 1 and 0.15 parts by weight of antistatic agent-1 was used, the resin material and the injection molded article were prepared. Obtained.
The obtained results are shown in Table 1.

(Reference Example 1)
0.03 part by weight of a phenolic antioxidant “RA1010” was added to 100 parts by weight of the propylene-based resin powder obtained by the metallocene catalyst obtained in Production Example 1, and after nitrogen sealing with a super mixer, the mixture was mixed for 3 minutes. After that, the powder was granulated at a cylinder temperature of 200 ° C., a screw rotation speed of 150 rpm, and an extrusion rate of 15 kg / h using a twin-screw extruder (TEM 35) manufactured by Toshiba Machine Co. Pellets were obtained.
This pellet was molded into a sheet-like molded body having a size of 100 mm × 100 mm and a thickness of 2 mm under the conditions of a cylinder temperature of 200 ° C. and a mold temperature of 40 ° C. using an IS100GN molding machine manufactured by Toshiba Machine Co., Ltd. Measurements were made. The obtained results are shown in Table 2.

(Reference Example 2)
The amount of volatile components was measured using pellets of antistatic agent-1. The obtained results are shown in Table 2.

(Reference Example 3)
The amount of volatile components was measured using pellets of antistatic agent-3. The obtained results are shown in Table 2.

In Examples 1 to 5, since a predetermined amount of the polymer type antistatic agent is added, the amount of volatile components is reduced to 10 ppm or less, and the surface resistivity is 10 ¹³ Ω or less both before and after washing with water, Antistatic properties are also imparted. Furthermore, in Examples 1 to 3 using the antistatic agent-1, the Na elution amount was reduced, and the haze showed a small value, which was a more preferable result.
This result is greatly reduced compared with the amount of volatile components expected from the blending ratio of propylene resin powder and polymer type antistatic agent. For example, when 90 parts by weight of the propylene-based resin powder of Production Example 1 and 10 parts by weight of the antistatic agent-1 are used, the expected volatile component is 12 ppm, but Example 2 using the same amount of the same substance. Was 4.8 ppm.
On the other hand, since the comparative example 1 uses the propylene-type resin powder by a Ziegler-type catalyst, the amount of volatile components is very large. In Comparative Example 2, since the proportion of the polymer antistatic agent was large, the amount of volatile components derived from the polymer antistatic agent increased. In Comparative Example 3, since the low molecular weight antistatic agent was used, the amount of volatile components was high, the surface resistivity after washing was overranged, and the antistatic property was not maintained. Due to these factors, it is unsuitable for a case for transporting electrical and electronic equipment parts.
The electrical and electronic equipment parts transport case manufactured using the propylene-based resin material of the present invention has a very small amount of volatile components and is molded by injection molding from a propylene-based resin imparted with antistatic properties. Compared with the conventional case, the contents are hardly contaminated and can be effectively used for transporting semiconductors for highly integrated circuits.

  The case for transporting electrical and electronic equipment parts according to the present invention is a highly productive transport case that is excellent in cleanliness that does not cause deterioration in performance during transport and has antistatic properties, and thus has excellent dust resistance. As a result, the yield of electrical and electronic equipment parts and the deterioration of quality during transportation can be prevented, so that industrial applicability is extremely high.

Claims (4)

  A phenolic antioxidant is added in an amount of 0.03 to 0.03% with respect to 100 parts by weight of a mixture of 85 to 99% by weight of a propylene resin and 1 to 15% by weight of a polymer-type antistatic agent produced using a metallocene catalyst. It is characterized by using a propylene-based resin material comprising 2 parts by weight, having a volatile component content of 10 ppm by weight or less, and having a surface resistivity change rate of 20% or less after washing with water. Case for transporting electrical and electronic equipment parts.   The case for transporting parts of electrical and electronic equipment according to claim 1, wherein the polymer type antistatic agent is a polyether / polyolefin block copolymer.   The case for conveying electric and electronic equipment parts according to claim 1, wherein the elution amounts of sodium and potassium of the propylene-based resin material are each 10 ppm by weight or less.   The case for conveying electrical and electronic equipment parts according to claim 1, wherein the elution amounts of sodium and potassium of the propylene-based resin material are each 1 ppm by weight or less.