JP5647908B2 - Antistatic composition and molded article - Google Patents

Description

  The present invention relates to an antistatic composition and a molded product obtained using the composition.

The resin molded body has an antistatic effect by using an antistatic agent. Such a molded body is used in a wide range of fields where chargeability can be an obstacle, including electric and electronic parts. The antistatic agent includes a kneading type and a coating type, and the kneading type antistatic agent is blended and used in a resin composition as a raw material of the molded body.
As such a kneading type antistatic agent, a surfactant (see Patent Document 1) and an ionic liquid (see Patent Document 2) have been disclosed so far.

JP 2006-111883 A JP 2005-015573 A

However, when a surfactant is used as the antistatic agent, there is a problem that the antistatic effect of the molded product is insufficient.
On the other hand, when an ionic liquid is used as the antistatic agent, the handleability of the resin composition deteriorates, and the resin composition is not sufficiently stirred in the molding machine, resulting in unevenness on the surface of the molded product, resulting in quality. There was a problem of being lowered.

  This invention is made | formed in view of the said situation, and makes it a subject to provide the molded object with a favorable surface state and a high antistatic effect, and the antistatic composition for this molded object.

To solve the above problem,
The present invention comprises (A) a surfactant, (B) an ionic liquid, and (C) an inorganic compound having one or more atoms selected from the group consisting of silicon, calcium, aluminum and zirconium and other atoms. Ri Na is, the (a) surfactant is a nonionic surfactant having a nitrogen atom, (B) the ionic liquids are those having imidazolium cation, (B) the ionic liquid The mass ratio of the blending amount / the blending amount of the (C) inorganic compound is 0.08 to 0.49, and the blending amount of the (B) ionic liquid is 100 blending amounts of the (A) surfactant. Provided is an antistatic composition characterized by being 2 to 14 parts by mass per part .
The antistatic composition of the present invention may further comprise (D) a thermoplastic resin.
In the antistatic composition of the present invention, the (C) inorganic compound is preferably calcium silicate, silica, calcium carbonate, alumina, or zirconia.
In the antistatic composition of the present invention, the thermoplastic resin (D) is polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl acetate, polymethyl methacrylate, AS resin, or ABS resin. It is preferable.
The present invention also provides a molded article obtained by using a molding composition comprising the antistatic composition of the present invention and (F) a thermoplastic resin.

  According to the present invention, it is possible to provide a molded article having a good surface state and a high antistatic effect, and an antistatic composition for the molded article.

<Antistatic composition>
The antistatic composition of the present invention comprises (A) a surfactant, (B) an ionic liquid, and (C) one or more atoms selected from the group consisting of silicon, calcium, aluminum, and zirconium, and other atoms. It is characterized in that an inorganic compound having the following (hereinafter abbreviated as “(C) inorganic compound”) is blended.
The antistatic composition of the present invention is more prominent than the case of an antistatic agent (composition) in which any one of these is used alone by using (A) a surfactant and (B) an ionic liquid in combination. High antistatic ability can be imparted to the molded body.

[(A) Surfactant]
The (A) surfactant is not particularly limited as long as it has an antistatic effect, and may be any of an anionic surfactant, a cationic surfactant, a nonionic surfactant, and an amphoteric surfactant.

  (A) Surfactant may be used individually by 1 type and may use 2 or more types together. When using 2 or more types together, the combination and ratio can be adjusted arbitrarily.

(A) The surfactant is preferably a nonionic surfactant.
As the nonionic surfactant, a surfactant having a nitrogen atom or an ester surfactant is preferable.
Examples of the surfactant having a nitrogen atom include alkylamine derivatives and polyoxyethylene fatty acid amides.
Examples of the ester surfactant include polyhydric alcohol fatty acid esters.

Examples of the alkylamine derivatives include polyoxyethylene alkylamines; alkyldiethanolamines such as decyldiethanolamine, dodecyldiethanolamine, tetradecyldiethanolamine, hexadecyldiethanolamine, octadecyldiethanolamine, and docosyldiethanolamine.
The alkyl group in the polyoxyethylene alkylamine may be linear, branched or cyclic.
The alkyl group in the alkyldiethanolamine preferably has 8 to 25 carbon atoms, and is preferably linear or branched.

  Examples of the polyoxyethylene fatty acid amide include N, N-bis (2-hydroxyethyl) laurylamide, N, N-bis (2-hydroxyethyl) myristylamide, and N, N-bis (2-hydroxyethyl) palmityl. N, N-bis (2-hydroxyethyl) stearamide, N, N-bis (2-hydroxyethyl) oleamide and other N, N-bis (2-hydroxyethyl) fatty acid amides; fatty acid diethanolamids such as lauryl diethanolamide Can be exemplified.

  Examples of the polyhydric alcohol fatty acid ester include glycerin fatty acid ester, pentaerythritol fatty acid ester, sorbitol fatty acid ester, sorbitan fatty acid ester, and sucrose fatty acid ester.

  What is necessary is just to adjust suitably the compounding quantity of (A) surfactant in an antistatic composition according to the kind of other compounding component, and it is not specifically limited. For example, if (D) a thermoplastic resin described later is not used, the blending amount of (A) surfactant in the total amount of blending components is preferably 50 to 95% by mass, and 60 to 85% by mass. % Is more preferable. By setting it as such a range, the effect of this invention is acquired more notably.

[(B) Ionic liquid]
The (B) ionic liquid is not particularly limited as long as it has an antistatic effect, and can be appropriately selected from known ones.
(B) Examples of the cation moiety constituting the ionic liquid include imidazolium-based cations, pyridinium-based cations, ammonium-based cations, and phosphonium-based cations, and those having one or more alkyl groups are preferred. Those having a group are more preferred.

The alkyl group possessed by the cation moiety may be linear, branched or cyclic, but is preferably linear or branched.
The linear or branched alkyl group preferably has 1 to 10 carbon atoms, and examples of the alkyl group include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, Isobutyl group, sec-butyl group, tert-butyl group, n-pentyl group, isopentyl group, neopentyl group, tert-pentyl group, 1-methylbutyl group, n-hexyl group, 2-methylpentyl group, 3-methylpentyl group 2,2-dimethylbutyl group, 2,3-dimethylbutyl group, n-heptyl group, 2-methylhexyl group, 3-methylhexyl group, 2,2-dimethylpentyl group, 2,3-dimethylpentyl group, 2,4-dimethylpentyl group, 3,3-dimethylpentyl group, 3-ethylpentyl group, 2,2,3-trimethylbutyl group, n-octyl group, iso Corruptible group, nonyl group, decyl group can be exemplified. Among these, those having 1 to 5 carbon atoms are more preferable.
The cyclic alkyl group may be monocyclic or polycyclic, and preferably has 3 to 10 carbon atoms, and includes a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, Examples thereof include a cyclononyl group, a cyclodecyl group, a norbornyl group, an isobornyl group, a 1-adamantyl group, a 2-adamantyl group, and a tricyclodecyl group.

  The cation moiety is preferably an imidazolium-based cation, and more preferably a 1,3-dialkylimidazolium cation such as 1-ethyl-3-methylimidazolium cation.

(B) As an anion part constituting the ionic liquid,
Halogen ions such as chloride ion (Cl ⁻ ), bromide ion (Br ⁻ );
Inorganic ions having an aluminum atom such as AlCl ₄ ⁻ , Al ₂ Cl ₇ ^— ;
Inorganic oxoacid ions such as nitrate ion (NO ₃ ⁻ ), borate ion (B (OH) ₄ ⁻ ), dihydrogen phosphate ion (H ₂ PO ₄ ⁻ ), perchlorate ion (ClO ₄ ⁻ );
Trifluoromethylsulfonate ion ^{_{(CF 3 -S - (= O}} ) 3) trifluoroalkyl sulfonate ion and the like;
An aliphatic monocarboxylate ion such as acetate ion (CH ₃ COO ⁻ );
Aliphatic dicarboxylate ions such as maleate ions, succinate ions, adipate ions;
Aromatic monocarboxylate ions such as benzoate ion (C ₆ H ₅ COO ⁻ ), salicylate ion (C ₆ H ₄ (OH) COO ⁻ );
Aromatic dicarboxylate ions such as phthalate ions;
Fluorinated aliphatic carboxylate ions such as trifluoroacetate ion (CF ₃ COO ⁻ );
Aliphatic sulfonate ions such as methanesulfonate ion (CH ₃ SO ₃ ⁻ );
Benzene sulfonate ion (C ₆ H ₅ SO ₃ ⁻ ), toluene sulfonate ion (CH ₃ C ₆ H ₄ SO ₃ ⁻ ), dodecylbenzene sulfonate ion (C ₁₂ H ₂₅ C ₆ H ₄ SO ₃ ⁻ ), etc. Aromatic sulfonate ions;
Fluorinated aliphatic sulfonic acid such as trifluoromethanesulfonic acid ion (CF ₃ SO ₃ ⁻ ), heptafluoropropanesulfonic acid ion (C ₃ F ₇ COO ⁻ ), nonafluorobutanesulfonic acid (C ₄ F ₉ SO ₃ ⁻ ), etc. ion;
Bis (fluorinated alkanesulfone) such as bis (trifluoromethanesulfonyl) imide ion ((CF ₃ SO ₂ ) ₂ N ⁻ , TFSI), bis (pentafluoroethanesulfonyl) imide ion ((C ₂ F ₅ SO ₂ ) ₂ N ⁻ ) Acid) imide ion;
_{(CF 3 SO 2) (CF} 3 CO) N - like mono (fluorinated alkane sulfonic acid) imide ion;
Tris (fluorinated alkanesulfonic acid) methide ion such as tris (trifluoromethanesulfonyl) methide ion ((CF ₃ SO ₂ ) ₃ C ⁻ );
Perfluoroalkyl fluoroborate ions;
Perfluoroalkyl fluorophosphate ions;
Tetracoordinate borate ions such as borodicatecatelate, borodiglycolate, borodisalicylate, borotetrakis (trifluoroacetate), bis (oxalato) borate;
Sulfate ester ions such as methyl sulfate and ethyl sulfate;
Tetrafluoroborate ion (BF ₄ ⁻ ), hexafluorophosphate ion (PF ₆ ⁻ ), hexafluoroarsenate ion (AsF ₆ ⁻ ), hexafluoroantimonate ion (SbF ₆ ⁻ ), hexafluoroniobate ion ( Fluorine-containing inorganic ions such as NbF ₆ ⁻ ) and hexafluorotantalate ion (TaF ₆ ⁻ );
Etc. can be illustrated.

  The anion moiety is preferably a trifluoroalkyl sulfonate ion such as a trifluoromethyl sulfonate ion.

  (B) An ionic liquid may be used individually by 1 type, and may use 2 or more types together. When using 2 or more types together, the combination and ratio can be adjusted arbitrarily.

  The blending amount of (B) ionic liquid in the antistatic composition is preferably 0.5 to 40 parts by weight, and 1 to 20 parts by weight per 100 parts by weight of (A) surfactant. It is more preferable. By being more than a lower limit, the antistatic effect of the molded object obtained becomes higher. Moreover, the surface state of the molded object obtained becomes more favorable because it is below an upper limit.

[(C) Inorganic compound]
The (C) inorganic compound adheres (A) a surfactant and (B) an ionic liquid, and in the antistatic composition or the molding composition described later, (A) the surfactant and (B) ion. It is assumed that the liquid is uniformly dispersed.
(C) The inorganic compound may be an inorganic compound containing one or more atoms selected from the group consisting of silicon (Si), calcium (Ca), aluminum (Al), and zirconium (Zr) and other atoms. . And any of a high molecular compound and a low molecular compound may be sufficient, and any of porous and non-porous may be sufficient.

  (C) The inorganic compound preferably has an oil absorption of 400 ml / 100 g or more, more preferably 550 ml / 100 g or more, according to a measurement method according to JIS K 5101.

  (C) The shape of the inorganic compound may be any shape such as a spherical particle shape, a rod shape, a plate shape, a fiber shape, a strip shape, an indefinite shape that does not correspond to any of these. Among these, preferable shapes include particle shapes and strip shapes.

  (C) An inorganic compound may be used individually by 1 type, and may use 2 or more types together. When using 2 or more types together, the combination and ratio can be adjusted arbitrarily.

Preferred examples of the inorganic compound (C) include calcium silicate, silica (SiO ₂ ), calcium carbonate, alumina (Al ₂ O ₃ ), and zirconia (ZrO ₂ ), and calcium silicate, silica, calcium carbonate, and alumina are examples. More preferred are calcium silicate and silica.

  The blending amount of the inorganic compound (C) in the antistatic composition is preferably 5 to 50 parts by weight per 100 parts by weight of the total blending amount of (A) surfactant and (B) ionic liquid. More preferably, it is 35 parts by mass. By being more than the lower limit, the molded body has a better surface state and a higher antistatic effect. Moreover, the transparency of the obtained molded object improves more because it is below an upper limit.

[(D) Thermoplastic resin]
As the antistatic composition of the present invention, a composition obtained by further blending (D) a thermoplastic resin (hereinafter abbreviated as “masterbatch”) can also be exemplified as a preferred embodiment. When manufacturing a molded body using the molding composition described later, a molding composition with a more uniform composition can be obtained by using a master batch, and as a result, a molded body with better quality can be obtained. It is done.

  The (D) thermoplastic resin is not particularly limited, and can be arbitrarily selected according to the use of the antistatic composition. Specifically, polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polystyrene (PS), polyvinyl acetate (PVAc), polymethyl methacrylate (PMMA), etc. Acrylic resin, AS resin, ABS resin, polyamide (PA), polyacetal (POM), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), polybutylene Phthalate (PBN), polyphenylene sulfide (PPS), polysulfone (PSF), polycarbonate (PC), polyimide (PI), polyphenylene ether (PPE), modified polyphenylene ether (m-PPE), polyester Terusarufon (PES), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyether ketone (PEK), polyetheretherketone (PEEK) and the like.

  (D) A thermoplastic resin may be used individually by 1 type, and may use 2 or more types together. When using 2 or more types together, the combination and ratio can be adjusted arbitrarily.

  Preferred examples of the thermoplastic resin (D) include polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl acetate, polymethyl methacrylate, AS resin, and ABS resin.

  When (D) a thermoplastic resin is used, in the antistatic composition, the blending amount of (D) the thermoplastic resin in the total amount of blending components is preferably 80 to 99% by mass, and 90 to 98% by mass. % Is more preferable. By being more than a lower limit, the sufficient effect by using (D) thermoplastic resin is acquired. Moreover, it can suppress that the usage-amount of the masterbatch at the time of molded object manufacture becomes excess because it is below an upper limit, and manufacture of a molded object becomes easier.

[(E) Other ingredients]
The antistatic composition of the present invention does not fall under the above (A) surfactant, (B) ionic liquid, (C) inorganic compound, and, if necessary, (D) a thermoplastic resin. (E) Other components may be blended.
Examples of the other component (E) include alcohols, ethers, carboxylic acids, carboxylates, and polyalkylene oxides.

(Alcohol)
The alcohol is preferably a higher alcohol or a polyhydric alcohol.
Examples of the higher alcohol include linear or branched monovalent (one hydroxyl group) having 10 or more carbon atoms, such as lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, cetostearyl alcohol, and isostearyl alcohol. It has alcohol).
Examples of the polyhydric alcohol include dihydric or higher alcohols (having two or more hydroxyl groups) such as ethylene glycol, diethylene glycol, polyethylene glycol, polypropylene glycol, polybutylene glycol, glycerin, sorbitol, and maltitol.

(Ethers)
Examples of the ethers include polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene alkyl ether such as polyoxyethylene stearyl ether; polyoxyethylene alkenyl ether such as polyoxyethylene oleyl ether; dimethyl ether, ethyl methyl ether, Dialkyl ethers such as diethyl ether and diisopropyl ether; hydroxyaryl alkyl ethers such as phenol methyl ether; cyclic ethers such as furan, dibenzofuran and tetrahydrofuran; methyl glycidyl ether, ethyl glycidyl ether, butyl glycidyl ether, 2-ethylhexyl glycidyl ether, decyl glycidyl Ether, neon pentyl glycol glycidyl ether, p- ( ec- butyl) phenyl glycidyl ether, p-(tert-butyl) phenyl glycidyl ether, polyethylene glycol diglycidyl ether, glycidyl ethers such as trimethylolpropane polyglycidyl ether and the like.

(Carboxylic acids)
The carboxylic acids are preferably higher carboxylic acids, more preferably fatty acids, and particularly preferably saturated fatty acids.
The saturated fatty acid preferably has 10 or more carbon atoms, and examples thereof include stearic acid, capric acid, lauric acid, myristic acid, palmitic acid, and behenic acid.

(Carboxylates)
The carboxylates are preferably higher carboxylates, more preferably fatty acid salts in which one or more hydrogen atoms in the hydrocarbon chain may be substituted with hydroxyl groups, and the fatty acid salts are saturated fatty acid salts. preferable. The carboxylates are preferably metal salts.
The saturated fatty acid metal salt preferably has 10 or more carbon atoms in the fatty acid residue constituting it, such as barium stearate, calcium stearate, zinc stearate, aluminum stearate, magnesium stearate, lithium stearate and the like. Examples include metal stearates: metal salts of 12-hydroxystearic acid such as lithium 12-hydroxystearate, zinc 12-hydroxystearate, calcium 12-hydroxystearate, magnesium 12-hydroxystearate, and the like.

(Polyalkylene oxide)
Examples of the polyalkylene oxide include polyethylene oxide, polypropylene oxide, and polytetramethylene oxide, and those having a number average molecular weight of 10,000 to 700,000 are preferable.

  (E) The other components may be used alone or in combination of two or more. When using 2 or more types together, the combination and ratio can be adjusted arbitrarily.

  The antistatic composition of the present invention comprises (A) a surfactant, (B) an ionic liquid, (C) an inorganic compound, and (D) a thermoplastic resin and / or (E) other components as necessary. It mix | blends and can manufacture by fully mixing these compounding components.

  Furthermore, at the time of blending each component, using a separate solvent, preparing a solution or dispersion of a part or all of the components, blending and mixing this, and then removing the solvent, An antistatic composition may be produced. The components other than the solvent contained in the solution or dispersion may be one kind or two or more kinds. By doing so, an antistatic composition having a more uniform composition may be obtained.

  Regardless of whether each component is a solution or a dispersion, they may be combined together at once, may be combined sequentially for each component, or only some of the components may be combined together. good. The blending order of each component is not particularly limited.

The mixing method is not particularly limited, and may be adjusted as appropriate according to the type of compounding component.
For example, the mixing temperature is preferably (A) a temperature equal to or higher than the melting point of the surfactant, and (D) a temperature range of 40 to 90 ° C. can be exemplified if a thermoplastic resin is not used. And when the solution or dispersion of the said component is used, you may mix a mixing component and the removal of a solvent simultaneously by mixing at the temperature more than the boiling point of a solvent. The mixing method is not particularly limited, and may be appropriately selected from known methods such as a method of mixing by rotating a stirrer or a stirring blade, a method of mixing using a mixer, a method of mixing by applying ultrasonic waves, and the like. good.

  On the other hand, when (D) a thermoplastic resin is used, for example, a method of melt-kneading the components after blending them using a twin screw extruder or the like can be exemplified. The temperature at the time of melt-kneading may be the same as that at the time of manufacturing a molded body described later. And after melt-kneading, it is preferable to shape | mold a kneaded material in a pellet form.

<Molded body>
The molded article of the present invention is obtained by using a molding composition comprising the antistatic composition of the present invention and (F) a thermoplastic resin.
By using the antistatic composition, the molded article of the present invention has a good surface condition and a high antistatic effect.

  As long as the molding composition does not interfere with the effects of the present invention, in addition to the antistatic composition and (F) thermoplastic resin, one or more (G) other components not included in these are blended. Also good. Said (G) other component is not specifically limited, For example, it may be the same as the component used at the time of manufacture of an antistatic composition. However, it is usually preferable not to use the other component (G).

  Examples of the thermoplastic resin (F) used in combination with the antistatic composition include those similar to the (D) thermoplastic resin used in the production of the antistatic composition. And (F) thermoplastic resin used together with an antistatic composition may be the same as (D) thermoplastic resin used for manufacture of an antistatic composition, and may differ. Usually, by using the same kind of thermoplastic resin, the molding composition has a more uniform composition and can be more easily prepared.

  In the molding composition, the blending amount of the antistatic composition may be appropriately adjusted. For example, (A) a surfactant, (B) an ionic liquid, and (C) an inorganic compound in the molding composition. The total amount is preferably 0.01 to 5% by mass, and more preferably 0.01 to 3% by mass. By setting it as such a range, the effect of this invention is acquired more notably. In addition, the compounding amount in the molding composition of (A) surfactant, (B) ionic liquid, and (C) inorganic compound is the equivalent compounding amount of these components derived from the antistatic composition and the molding composition. It refers to the total amount of these components used separately when preparing the product.

(B) Since the ionic liquid usually has a peculiar color and odor, if the blending amount in the molding composition is too large, the resulting molded product will also have coloring and odor.
On the other hand, the antistatic composition of the present invention can greatly reduce the blending amount of (B) ionic liquid by using (A) surfactant and (B) ionic liquid in combination, and Sufficient antistatic ability is also given. And in this invention, it is preferable to adjust the compounding quantity of an antistatic composition so that the compounding quantity of (B) ionic liquid in a molding composition may be 0.3 mass% or less. By setting it as such a range, the higher effect which suppresses coloring and odor of the molded object obtained is acquired.

  The molded body can be produced by a known method of molding a resin composition. For example, the molding composition may be melt-kneaded and molded by injection molding or the like. The temperature at the time of melt kneading is preferably 170 to 250 ° C.

  From the excellent antistatic effect of the molded article of the present invention, it is presumed that the component corresponding to the antistatic agent is distributed at a sufficient concentration on the surface. The phenomenon that the antistatic agent in the molded body moves through the molded body and moves to the surface (bleed) is widely known, and it is estimated that the same thing occurs in the molded body of the present invention. On the other hand, as a composition containing a surfactant and an ionic liquid, “JP-A-2006-52379” discloses an adhesive composition. This pressure-sensitive adhesive composition is used for sticking a protective material as a pressure-sensitive adhesive, and has an antistatic effect on an adherend to be protected, and a surfactant and an ionic liquid that are antistatic agents. By suppressing, transfer of these antistatic agents to the adherend is suppressed, and contamination of the adherend is prevented. The pressure-sensitive adhesive composition described in the above document contains a surfactant, an ionic liquid and a resin, and is similar to the antistatic composition of the present invention in that a surfactant and an ionic liquid are used. . However, the above document describes that when only a surfactant is used as an antistatic agent, the surfactant is likely to bleed on the adhesive surface, and the adhesive composition described in the above document is It can be said that bleed to the surface of these pressure-sensitive adhesives is suppressed by using an ionic liquid in combination with a surfactant. Therefore, the antistatic composition of the present invention has an excellent antistatic effect even when (A) a surfactant and (B) an ionic liquid are used in combination, and this is applied to the surface of the molded body. In view of the content described in the above document, it is quite unexpected in that it is presumed to be an effect of the antistatic agent being distributed at a sufficient concentration.

  Hereinafter, the present invention will be described in more detail with reference to specific examples. However, the present invention is not limited to the following examples.

<Raw materials>
The raw materials used are shown below.
[(A) Surfactant]
(A) -1: polyoxyethylene alkylamine (ES100, manufactured by NOF Corporation)
(A) -2: Glycerin fatty acid ester (EN1100, manufactured by NOF Corporation)
[(B) Ionic liquid]
(B) -1: 1-ethyl-3-methylimidazolium trifluoromethylsulfonate (manufactured by Merck)
[(C) Inorganic compound]
(C) -1: Strip-shaped calcium silicate (Dobermorite powder TK, manufactured by Nippon Insulation Co., Ltd., oil absorption 624 ml / 100 g)
[(F) Thermoplastic resin]
(F) -1: Polypropylene (Prime Polypro J2023GR, manufactured by Prime Polymer Co., Ltd.)

<Production of antistatic composition and molded article>
[Example 1]
(Production of antistatic composition)
Surfactant (A) -1 (0.5 parts by mass) and ionic liquid (B) -1 (0.05 parts by mass) are dissolved in acetone so that the total concentration thereof is 30%. A solution was prepared.
Next, an inorganic compound (C) -1 (0.1375 parts by mass) is added to the obtained acetone solution, and acetone is volatilized and removed while stirring at 70 ° C. to obtain an antistatic composition. It was.

(Manufacture of molded products)
The total amount of the obtained antistatic composition and thermoplastic resin (F) -1 (99.45 parts by mass) were mixed and obtained using a twin screw extruder (OMEGA 30, manufactured by Steel). The obtained mixture was melt-kneaded at a temperature of 190 ° C. and then injection-molded under the conditions of 210 ° C. and 28 t to obtain a molded body.

(Evaluation of molded body)
The obtained molded body was placed in a polyethylene bag and allowed to stand at room temperature for 1 day, then removed from the polyethylene bag and allowed to stand in an environment of 23 ° C. and 50% relative humidity for 3 days. Aged. With respect to the molded body after aging, the surface resistivity (Ω / □) was measured by the following method to evaluate the antistatic effect, and the surface was visually observed to evaluate the surface state. Each evaluation standard is as follows. The evaluation results are shown in Table 1.

(Measurement of surface resistivity)
Using a resistance measuring instrument (Hirester UP, manufactured by Mitsubishi Chemical Analytech Co., Ltd.), the surface resistivity of the molded body was measured under the conditions of an applied voltage of 500 V and an applied time of 60 seconds.
(Evaluation of antistatic effect)
When the measured value of the surface resistivity is less than 1 × 10 ¹⁰ , ◎ 1 × 10 ¹⁰ or more and less than 1 × 10 ¹¹ is given as ◯, 1 × 10 ¹¹ or more as x.
(Evaluation of surface condition)
The case where clear irregularities were not seen on the surface of the molded product was marked with ◯, and the case where obvious irregularities were seen was marked with x.

[Examples 2-8, Comparative Examples 1-3]
Charging as in Example 1 except that (A) surfactant, (B) ionic liquid, (C) inorganic compound, and (F) the type and amount of thermoplastic resin used are shown in Table 1. A preventive composition and a molded body were produced, and the molded body was evaluated. The evaluation results are shown in Table 1. In Table 1, “-” indicates that the component is unused.

As is clear from Table 1, the molded bodies of the respective examples were excellent in both the surface state and the antistatic effect. Also, no coloring or odor was observed.
On the other hand, in Comparative Example 1, as a result of using the surfactant (A) alone, the antistatic effect was insufficient. Moreover, in Comparative Examples 2 and 3, as a result of using the (B) ionic liquid alone, the surface state was poor. In particular, although Comparative Example 3 improved the antistatic effect as compared with Comparative Example 2, the surface condition was further deteriorated.

Moreover, the usage-amount of (A) surfactant and (B) ionic liquid in Example 1 are all the same as those usage-amount in the comparative example 1 or 2. Based on this point, the results of Example 1 and Comparative Examples 1 to 3 will be considered.
In Comparative Example 3, the amount of (B) ionic liquid used was increased 10 times to achieve a surface resistivity that was an order of magnitude smaller than that of Comparative Example 2, and the value was as excellent as that of Example 1. is there. Further, as is clear from the results of Comparative Examples 1 and 3, (A) the surfactant is greatly inferior in antistatic ability than (B) the ionic liquid, and Comparative Example 1 has a surface resistivity of 3 compared to Comparative Example 3. The digit is also big. Then, in consideration of improving the antistatic ability of the antistatic composition of Comparative Example 2, 0.45 parts by mass of (B) ionic liquid was further added to the antistatic composition of Comparative Example 2. To the composition of Comparative Example 3 in which the amount used was 10 times as much as 0.5 parts by mass, 0.45 parts by mass of (A) surfactant was added instead of (B) ionic liquid, and (A) interface Assuming a composition in which the total amount of activator and (B) ionic liquid used is 0.5 parts by mass, such a composition is a molded article that has a significantly lower antistatic effect than the composition of Comparative Example 3. Is expected to give However, the surface resistivity in Example 1 is comparable to that in Comparative Example 3. The amount of (A) surfactant used in Example 1 is 0.5 parts by mass, not 0.45 parts by mass, and 0.05 parts by mass more than the composition assumed above. In addition, considering that (A) the surfactant is greatly inferior in antistatic ability when used alone as compared with (B) the ionic liquid, Example 1 showed an excellent surface resistivity comparable to that of Comparative Example 3. Is completely unexpected, and Example 1 shows an antistatic effect exceeding the range assumed from the results of Comparative Examples 1 to 3. That is, in the present invention, by using (A) a surfactant and (B) an ionic liquid in combination, a synergistic effect that is extremely superior in terms of antistatic ability is achieved compared to the case where these are used alone. It is estimated that

  The present invention can be used in a wide range of fields in which the chargeability of a molded body can be an obstacle, including electric / electronic parts.

Claims (5)

(A) a surfactant, (B) an ionic liquid, and (C), silicon, calcium, Ri inorganic compound having a one or more atoms and other atoms selected from the group consisting of aluminum and zirconium name is blended ,
The (A) surfactant is a nonionic surfactant having a nitrogen atom, and the (B) ionic liquid has an imidazolium cation,
The mass ratio of the blending amount of the (B) ionic liquid / the blending amount of the (C) inorganic compound is 0.08 to 0.49,
The antistatic composition , wherein the amount of the (B) ionic liquid is 2 to 14 parts by mass per 100 parts by mass of the (A) surfactant .   Furthermore, (D) thermoplastic resin is mix | blended, The antistatic composition of Claim 1 characterized by the above-mentioned. The antistatic composition according to claim 1 or 2 , wherein the inorganic compound (C) is calcium silicate, silica, calcium carbonate, alumina, or zirconia. Wherein the (D) thermoplastic resin, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl acetate, polymethyl methacrylate, to claim 2 or 3, characterized in that an AS resin or ABS resin The antistatic composition as described. A molded article obtained by using a molding composition comprising the antistatic composition according to any one of claims 1 to 4 and (F) a thermoplastic resin.