JP2005139315A - Antistatic resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an antistatic resin composition controlled in static electricity dissipation function, excellent in sustainability and causing no contact migration. <P>SOLUTION: The antistatic resin composition is obtained by compounding (a) a thermoplastic resin and/or an unvulcanized rubber, (b) an inorganic filler the surface of which is coated with at least one (co)polymer selected from the group consisting of polyalkylene ether, polyester, polyamine, polysulfide and polyacrylonitrile, and a solution prepared by dissolving (c) the metal salt described below in (d) an aqueous solvent and/or an alcohol-based solvent. Another version of the antistatic resin composition is obtained by removing the aqueous solvent and/or the alcohol-based solvent from this antistatic resin composition. The metal salt(c) is constituted of a cation selected from the group consisting of Li<SP>+</SP>, Na<SP>+</SP>, K<SP>+</SP>, Mg<SP>2+</SP>and Ca<SP>2+</SP>and an anion selected from the group consisting of Cl<SP>-</SP>, Br<SP>-</SP>, F<SP>-</SP>, I<SP>-</SP>, NO<SB>3</SB><SP>-</SP>, SCN<SP>-</SP>, ClO<SB>4</SB><SP>-</SP>, CF<SB>3</SB>SO<SB>3</SB><SP>-</SP>, BF<SB>4</SB><SP>-</SP>, (CF<SB>3</SB>SO<SB>2</SB>)<SB>2</SB>N<SP>-</SP>and (CF<SB>3</SB>SO<SB>2</SB>)<SB>3</SB>C<SP>-</SP>. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an antistatic resin composition, and more particularly, to an antistatic resin composition having a controlled electrostatic dissipation function, excellent sustainability, and no contact transferability.

Antistatic resins are widely used in industry and are used for various purposes. As this antistatic resin, for example, there is a composition in which each resin is highly filled with a conductive filler such as carbon black, and since it is excellent in economy, it is widely used mainly in the industry. .
By the way, in recent years, antistatic resins and compositions thereof have become widespread in IC chip packaging, and variations in materials have been diversified from general-purpose plastics to engineering plastics. In addition to carbon black, carbon fibers, graphite, metal-coated fillers, metal fibers, and the like are widely used depending on the purpose and function. Antistatic resin compositions as materials for IC trays and the like used for packaging IC chips have been studied for weight reduction, thickness reduction, and compactness, and tend to require strength and high rigidity. Furthermore, for the purpose of identifying the type of IC, the tray and the carrier tape also have a design requirement such as coloring.

In response to such demands, carbon black, which is widely used as an antistatic filler, is economical and can be obtained with a low resistance value. Since there is a problem in material strength and the like, it is usually used in combination with various modifying materials.
Furthermore, in recent years, with regard to electrical properties required for polymer materials used for packaging applications such as trays and peripheral devices due to high performance and large capacity of ICs and LSIs, the volume resistivity is 10 ¹⁰ Ω · cm. The characteristic of less than is now required stably, so the level of the so-called conventional antistatic area is not enough, and the relatively high volume resistivity value is stabilized by the spread of electrophotographic systems using static electricity. There is also a demand for polymer materials that can be expressed in the field.

Antistatic resin compositions containing an antistatic agent are also widely used and applied to various uses. Antistatic agents can be polymer-alloyed with surfactant-type surfactants that bleed on the surface and so-called polymer-type hydrophilic polymer materials that have hydrophilic segments in their structure. There is something that expresses the function.
The surfactant type is intended to prevent the static electricity by transferring the surfactant contained in the resin composition to the surface. However, the antistatic effect is lost by surface wiping and cleaning, or surface contamination. In addition to sustainability problems, satisfactory volume resistivity cannot be obtained.

  On the other hand, the polymer type imparts permanent antistatic performance to a thermoplastic resin by polymerizing a hydrophilic polymer, and has high industrial utility value. However, if an attempt is made to develop a high antistatic function, the amount of the polymer type antistatic agent required for alloying increases, which may be economically problematic. The polymer antistatic agent generally has many hydrophilic segments, and many have flexibility, so by alloying, the rigidity of the resulting antistatic resin material is reduced, In addition to deformation of a molded product, addition to a polymer material such as a flexible synthetic polymer rubber or elastomer has a problem that the obtained antistatic property is large and difficult to apply.

Furthermore, it is difficult to control the electric resistance value of any antistatic resin composition obtained by using the above-described surfactant type and polymer type antistatic agents.
Further, there is an antistatic resin composition (Patent Document 1) containing a filler whose surface is pretreated with an antistatic agent, but the volume resistivity is not sufficiently reduced, and the antistatic agent is separated from the filler and bleeds. There is a problem to go out.

Furthermore, as a polymer type antistatic agent, the terminal group of poly (oligo) ethylene glycol having an alkyl group or an alkyl-substituted phenyl group at one end and having an ethylene oxide group is esterified with a methacryloyl group or an acryloyl group. Methacrylate or acrylate is also mentioned (Patent Document 2). As the alkyl group at one end, a linear or branched one having 1 to 25 carbon atoms is used. In the same publication, a filler whose surface is coated with these hydrophilic polymers, or a lithium salt dissolved in the polymer is proposed. Because of the use of chlorine, there are problems of corrosion of contact equipment, degradation of polymers, and coloring due to chlorine ions.
Moreover, the thing using the trifluoromethanesulfonic acid lithium salt (patent document 2) is illustrated. In the invention described in the publication, although the conductivity is good, the filling of such filler necessary to obtain the desired conductivity requires a high addition amount of 50 to 60% by weight or more, The conductivity stability was not satisfactory. Rather, there are problems such as deterioration of mechanical properties due to high filling, colorability (yellowing), and thermal deterioration of materials.
A method for introducing an electrolyte by dissolving it in a specific fatty acid solvent, such as a surfactant-based composition which is a conventional antistatic technique based on non-carbon, or Japanese Patent Application No. 2002-060213, is a low molecular compound (for example, an organic colorant). , Organic dyes, plasticizers, process oils, etc.), a so-called contact transfer occurs in which only low molecular weight compounds are selectively transferred to non-contact materials. Due to this contact transfer, there has been a problem that the function of the contact portion is lowered or the appearance is deteriorated, leading to a deterioration in quality.
Japanese Patent Laid-Open No. 11-256144 Japanese Patent Laid-Open No. 11-256144

  Although the conventional antistatic resin composition is excellent in sustainability, there is a problem that the antistatic property is not stable and the balance of contact transfer is not sufficient.

The present invention comprises (a) 20 to 80 parts by weight of a thermoplastic resin and / or unvulcanized rubber, and (b) at least one selected from the group of polyalkylene ether, polyester, polyamine, polysulfide, and polyacrylonitrile. 80 to 20 parts by weight of an inorganic filler coated with a (co) polymer of (a) + (b) = 100 parts by weight), and (c) 5 to 100 parts by weight of a metal salt (d) ) A solution dissolved in 100 parts by weight of water and / or alcohol solvent was blended so as to be 0.01 to 20 parts by weight as a metal salt with respect to (a) + (b) = 100 parts by weight. The present invention relates to a characteristic antistatic resin composition.
(C) Metal salt: a cation selected from the group consisting of Li ⁺ , Na ⁺ , K ⁺ , Mg ²⁺ and Ca ²⁺ and Cl ⁻ , Br ⁻ , F ⁻ , I ⁻ , NO ₃ ⁻ , SCN ⁻ , ClO. _A metal salt composed of an anion selected from the group consisting of ₄ ⁻ , CF ₃ SO ₃ ⁻ , BF ₄ ⁻ , (CF ₃ SO ₂ ) ₂ N ⁻ and (CF ₃ SO ₂ ) ₃ C ⁻ It is related with the antistatic resin composition characterized by volatilizing and removing water and / or alcohol solvent from the antistatic resin composition of this.
Here, in the above two antistatic resin compositions, the component (c) is selected from the group consisting of lithium trifluoromethanesulfonate, lithium bis (trifluoromethanesulfonyl) imide, and lithium tris (trifluoromethanesulfonyl) methide. Preferably, at least one selected from the above is used.
Furthermore, the present invention provides (a) 20 to 80 parts by weight of a thermoplastic resin and / or unvulcanized rubber, and (b) at least the surface is selected from the group of polyalkylene ethers, polyesters, polyamines, polysulfides, and polyacrylonitriles. 80 to 20 parts by weight of an inorganic filler coated with one kind of (co) polymer (however, (a) + (b) = 100 parts by weight) is added with 5 to 100 parts by weight of the above (c) metal salt. (D) A solution dissolved in 100 parts by weight of water and / or an alcohol-based solvent was blended so as to be 0.01 to 20 parts by weight as a metal salt with respect to (a) + (b) = 100 parts by weight. Thereafter, the composition is melt-kneaded to (d) a method for producing the antistatic resin composition as described above, wherein water and / or alcohol solvent is removed by volatilization.

  In the antistatic resin composition of the present invention, the inorganic filler whose surface is coated with at least one (co) polymer selected from the group of polyalkylene ether, polyester, polyamine, polysulfide, and polyacrylonitrile is specified. The antistatic property is stably maintained, there is no contact transfer, no variation, and excellent durability. Taking advantage of its excellent characteristics, it can be suitably used for OA equipment-related, home appliance field, electric / electronic field, vehicle field, other various parts, housing, package and the like.

  The (a) thermoplastic resin and unvulcanized rubber used in the composition of the present invention may be anything. Among these, as the thermoplastic resin, for example, polyvinyl chloride, polystyrene resins such as polystyrene and acrylonitrile / butadiene / styrene copolymers (ABS resins); vinyl monomer polymers or copolymers such as acrylate / methacrylate resins Coalescence; poly α-olefins such as low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, polybutene-1, poly 4-methylpentene-1, propylene / ethylene block copolymer, Α-olefins such as propylene / ethylene random copolymers, copolymers of α-olefins and other monomers; other polyolefin resins; polyamides such as nylon 6, nylon 66, nylon 12; polyethylene terephthalate Aromatic polyester such as polybutylene terephthalate and aliphatic polyester; liquid crystal polyester; aromatic polyether such as polyphenylene oxide; polyacetal resin; polycarbonate resin; sulfone polymer such as polyimide, polysulfone and polyethersulfone Can be mentioned.

The thermoplastic elastomer includes polar elastomers such as polyurethane, polyester and polyamide, polyolefins, polystyrenes [styrene-butadiene-styrene copolymer (SBS), styrene-ethylene-butadiene-styrene copolymer (SEBS). Nonpolar elastomers such as styrene-ethylene-propylene-styrene copolymer (SEPS)] can also be used. In addition, as an unvulcanized rubber, acrylonitrile-butadiene rubber (NBR), ethylene-propylene terpolymer (EPDM), chloroprene rubber (CR), acrylic rubber (AR),
Styrene-butadiene rubber (SBR) is also applicable. These thermoplastic elastomers and unvulcanized rubber generally contain processing oils such as plasticizers and process oils, but these are not included because they often cause contact transfer. Or it is preferable to use as little as possible.

  In the present invention, one or more of the above thermoplastic resins and / or unvulcanized rubbers are appropriately selected according to the purpose. Among these, from the viewpoint of moldability, thermoplastic resins include vinyl monomer polymers or copolymers such as polyvinyl chloride, polystyrene, and ABS resins; polypropylene, crystalline propylene / ethylene copolymers and crystalline propylene / butene. -1 copolymer, crystalline propylene copolymer, nylon, polybutylene terephthalate, and the like are preferable, and vinyl monomer polymers or copolymers such as polyvinyl chloride, polystyrene, and ABS resin are particularly preferable. Examples of unvulcanized rubber include NBR, isoprene rubber (IR), butadiene rubber (BR), butyl rubber (IIR), ethylene-propylene rubber (EPM), EPDM, AR, SBR, fluorine rubber, silicone rubber, urethane rubber, and the like. preferable.

In particular, the thermoplastic elastomer and the unvulcanized rubber have a function of promoting the molecular mobility of the segment in which the ionic component is solvated to give preferable ionic conductivity, and the electrical conductivity is good. In the present invention, it is also possible to use a form such as a polymer blend, a polymer alloy, etc., of any thermoplastic component in these thermoplastic resins, thermoplastic elastomers, and unvulcanized rubber.
From the viewpoint of heat resistance, polycarbonate, polyethylene terephthalate, aromatic polyimide, aromatic polyether and the like are preferable.

Component (b) is a surface-treated inorganic filler, and at least one (co) polymer selected from the group of polyalkylene ether, polyester, polyamine, polysulfide, and polyacrylonitrile on the surface of the inorganic filler. Are surface-coated or graft-bonded.
The inorganic filler of the present invention is not particularly limited, and known inorganic fillers can be used. Among them, calcium carbonate, talc, mica, glass, calcium silicate, sericite, magnesium hydroxide, water Aluminum oxide, montmorillonite, zeolite, titanium oxide, kaolin and the like can be used satisfactorily. Further, the form of the inorganic filler is not particularly limited, and it can be used from those having a small particle diameter to those having a large aspect ratio such as a fiber shape, a tetrapot shape, and a scale shape.

  The (co) polymer used for the surface treatment of the inorganic filler is a (co) polymer having a segment having one or more of alkylene ether, ester, amine, sulfide, and acrylonitrile as a basic repeating unit. Yes, preferably a polyalkylene ether or polyester. The above (co) polymers are polar functional groups such as ester groups, ether groups, hydroxyl groups, amine groups, carbonyl groups, epoxy groups, sulfonic acid groups, nonpolar groups of alkyl groups, alkyl group-substituted phenyls. A group may be included in the skeleton.

A (co) polymer having a segment having an alkylene ether and / or ester as a basic repeating unit can be obtained by various synthesis methods, and there are various forms thereof. Examples thereof include a chain or branched polymer polyol type and / or a type in which a terminal hydroxyl group is capped with a methyl group, an ethyl group, a t-butyl group, or the like.
As the linear polymer polyol, for example, a linear block copolymer having a hydroxyl group at the end and having at least one compound selected from the group of ethylene glycol, propylene glycol, and butanediol as a constituent component The linear polymer polyol which has as frame | skeleton is mentioned.

  Moreover, as said branched polymer polyol, the content rate of an ethylene oxide type structural component is 10 mol%-50 mol%, saponification degree 30-100%, number average molecular weight 1,000-20,000, an ethylene unit, for example Examples thereof include branched polymer polyols in which alkylene oxide is grafted onto a saponified ethylene / saturated carboxylic acid vinyl ester copolymer having a content of 1 to 90% by weight.

The method for producing the ethylene / saturated carboxylic acid vinyl ester copolymer is not particularly limited, and can be produced by a known method such as a high-pressure radical polymerization method.
The vinyl ester of a saturated carboxylic acid that is a raw material for copolymerization with an ethylene monomer is not particularly limited, but is preferably an aliphatic carboxylic acid vinyl ester having about 2 to 4 carbon atoms, such as vinyl acetate, vinyl propionate, Examples thereof include vinyl butyrate and the like, and these can also be used in appropriate mixture. Of these, vinyl acetate is most preferred.

Further, as a copolymer raw material, in addition to ethylene and saturated carboxylic acid vinyl ester, a small amount of alkyl ester of α, β-unsaturated carboxylic acid such as methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, Ethyl methacrylate, butyl methacrylate and the like, and a mixture of two or more thereof can also be used. The ethylene content of the ethylene / saturated carboxylic acid vinyl ester copolymer is usually about 1 to 90% by weight, preferably about 40 to 80% by weight.
The number average molecular weight is usually about 1,000 to 20,000, preferably about 1,000 to 10,000.

The saponification reaction of the ethylene / saturated carboxylic acid vinyl ester copolymer is not particularly limited, and for example, the ethylene / saturated carboxylic acid vinyl ester copolymer and alcohol are saponified by heating in the presence of an alkali catalyst, An example is a method in which an alkylene oxide is introduced after the alcohol is removed and grafted.
Also, as a saponification method, a heterogeneous liquid phase system with alcohol or an alcohol solution system may be used depending on the characteristics resulting from the molecular weight of the ethylene / saturated carboxylic acid vinyl ester copolymer used, the content of the saturated carboxylic acid vinyl ester, etc. In addition, a pellet dispersion system in alcohol can be appropriately employed. The saponification rate varies depending on the saturated carboxylic acid vinyl ester content of the ethylene / saturated carboxylic acid vinyl ester copolymer, and is not particularly limited, but is usually about 30 to 100%, preferably about 50 to 100%.

The method for adding alkylene oxide to the saponified ethylene / saturated carboxylic acid vinyl ester copolymer is not particularly limited, but the saponified product is generally reacted with alkylene oxide in a gaseous state.
Although it does not specifically limit as an alkylene oxide, Usually, a C2-C4 thing is preferable, For example, the copolymer modified material etc. which are ethylene oxide, propylene oxide, butylene oxide, cyclic ether, etc. are mentioned. Of these, ethylene oxide is preferably used. Two or more kinds of alkylene oxides can be used. In this case, block addition or random addition may be performed.
The addition amount of the alkylene oxide is not particularly limited, but is usually about 20 to 1,000 parts by weight, preferably about 50 to 500 parts by weight with respect to 100 parts by weight of the saponified product.
The alkylene oxide adduct of the saponified ethylene / saturated carboxylic acid vinyl ester copolymer saponifies the ethylene / saturated carboxylic acid vinyl ester copolymer to convert some or all of the saturated carboxylic acid vinyl ester into a vinyl alcohol structure. It is presumed to have a structure in which the main chain has a polyethylene unit and the side chain has a polyoxyalkylene unit.

As the ethylene / saturated carboxylic acid vinyl ester copolymer used in the present invention, an ethylene / vinyl acetate copolymer is particularly preferable from the viewpoint of market availability, price, etc., vinyl acetate unit content 5 to 50% by weight, number average Those having a molecular weight of 1,000 to 5,000 are more preferable because the bulk saponification reaction is easy.
The saponification rate of the ethylene / vinyl acetate copolymer is preferably in the range of 30 to 100% in order to obtain a resin having good compatibility with the resin. The amount of ethylene oxide added to the saponified ethylene / vinyl acetate copolymer is 50 to 1,000% by weight based on the saponified ethylene / vinyl acetate copolymer. It is more preferable in terms of the effect.

As the branched polymer polyol, a branched polymer polyol having a hydroxyl group at the terminal and obtained by grafting alkylene oxide to a trifunctional polyol structure can also be used. Trifunctional polyols having a trifunctional polyol structure include pyrogallol, trihydroxy aromatic compounds such as 1,2,4-trihydroxybenzene, aliphatic triols such as glycerin 1,1,1-tris (hydroxymethyl) ethane, Trialcoholamines such as ethanolamine can be mentioned.
Examples of these polymers include, but are not limited to, ketones such as acetone and methyl ethyl ketone, nitriles such as acetonitrile, halogens such as chloroform, amides such as dimethylformamide, and the like. It can be easily obtained by a polymerization method using a crosslinking agent such as isocyanate in these organic solvents, or a polymerization method in which a trifunctional polyol or alkylene oxide is melt blended with a thermoplastic resin and reacted. The alkylene oxide is not particularly limited, but usually those having about 2 to 4 carbon atoms are preferable. Examples thereof include ethylene oxide, propylene oxide, butylene oxide, and modified copolymer of cyclic ether. .

As the branched polymer polyol, a branched polymer polyol obtained by a reaction of a styrene / maleic anhydride copolymer and a polyalkylene oxide monoalkyl ether can also be used.
For example, the number average molecular weight of the styrene / maleic anhydride copolymer is 1,000 to 400,000, and the copolymerization molar ratio of styrene to maleic anhydride is 1/1 to 1/9. The number average molecular weight of the alkyl ether is 100 to 5,000, and the polyalkylene oxide monoalkyl ether is a branched polymer polyol represented by the following formula (1): R ¹ O— (CH ₂ —CH—O) _m —H
│ ……… (1)
R ²
(Wherein R ¹ is an alkyl group having 1 to 4 carbon atoms, R ² is a hydrogen atom or an alkyl group having 1 to 2 carbon atoms, and m is an integer of 5 to 100). The polyalkylene oxide monoalkyl ether may be not only a single type but also two or more types (for example, those in which R ² is hydrogen and a methyl group in formula (1)). Among these, polyethylene oxide monomethyl ether is preferable in terms of reactivity.

As the branched polymer polyol, the reaction between the terminal hydroxyl group of polyalkylene oxide monoalkyl ether and the acid anhydride group of styrene / maleic anhydride copolymer results in polystyrene as the main chain and polyalkylene oxide monoalkyl ether as the side chain. Also included are comb polymer polyols. In the above comb polymer polyol, if the number average molecular weight of the polyalkylene oxide monoalkyl ether is less than 100, the antistatic function of the polymer polyol itself is insufficient, while if it exceeds 5,000, the styrene / maleic anhydride copolymer is insufficient. Reactivity with coalescence is poor. When the carbon number of R ^{1 in} the formula (1) exceeds 4, the ionic conductivity is inferior.

As for the content rate of ethylene oxide in the polyether used for these polymers, it is desirable that they are 10 mol%-50 mol%. If it exceeds 50 mol%, crystallization occurs and becomes solid and difficult to handle. On the other hand, if it is less than 10 mol%, the components (c) and (d) are not sufficiently dissolved, and the electrical characteristics are deteriorated.
Further, as the chain extender, a linear or branched polyether block copolymer type polymer polyol that can be extended by a reaction with an aromatic isocyanate, an aliphatic isocyanate or the like can also be used. Examples of such structures include segmented polyurethane elastomers.

As the (co) polymer having a segment having an alkylene ether and / or ester as a basic repeating unit, an elastomer skeleton composed of a hard segment and a soft segment can also be used. For example, it has a polyester elastomer structure, and is represented by a polyester / polyether type having a polyether structure as a soft segment, or a polyester / polyester type having a polyester structure as a soft segment with respect to polybutylene terephthalate as a hard segment. It is an elastomer.
The polyester / polyether type is synthesized by, for example, transesterification and polycondensation using dimethyl terephthalate, 1,4 butanediol, polytetramethylene ether glycol, and the like as starting materials.
The polyester / polyether type is synthesized by transesterification and ring-opening reactions using dimethyl terephthalate, 1,4 butanediol and ε-caprolactone as starting materials.

Polyamide elastomers can also be used as (co) polymers having segments having alkylene ethers and / or esters as basic repeating units. The polyamide elastomer is a general term for a thermoplastic elastomer having a polyamide constrained phase and a polyether and / or polyester structure as a soft segment. For example, a polyamide elastomer using a PA (polyamide) 12 component as a polyamide constrained phase is prepared by using lauryl lactam, dicarboxylic acid, and polyether diol as raw materials, adding water as a lactam ring-opening catalyst, and reacting under pressure and heating. To obtain a carboxyl telechelic nylon 12 oligomer and then a condensation reaction with a polyether diol. In addition, PA (polyamide) 6 or the like is also used as the polyamide constrained phase.
The polyamide elastomer that can be used in the present invention is basically a polyester block polyamide elastomer or a polyether ester block polyamide elastomer. Polyamide elastomers having various characteristics can be used depending on the type of diol used as a component.

As the (co) polymer having a segment having an alkylene ether and / or ester as a basic repeating unit, an aliphatic polyester can also be used. Industrially, aliphatic polyesters include those synthesized by dehydration polycondensation reaction and dediol reaction using aliphatic dicarboxylic acid and excess diol as starting materials, and those synthesized by ring-opening polymerization of caprolactone. It is done.
The structure of the aliphatic polyester of the present invention includes a binary condensate of succinic acid and 1,4-butanediol, such as polybutylene succinate and polybutylene succinate adipate, succinic acid and adipic acid and 1,4- What consists of a ternary condensate of butanediol is mentioned. In addition, reactive groups and skeletons such as isocyanate groups, urethane groups, and aromatic rings are introduced into the structure, and polylactic acid is used in combination as long as the functionality of the biodegradable function is not impaired. Various copolymers such as polymerized copolyesters can also be used.

As the aliphatic polyester, various high molecular weight types such as polybutylene succinate, polyethylene succinate and copolymers thereof are industrially produced. As the aliphatic polyester, a commercially available product having a biodegradable function can be used. For example, polybutylene succinate adipate manufactured by Showa Polymer Co., Ltd., biodegradable aliphatic polyester, trade name Bionore, polycaprolactone There is a product name CELGREEN PH7 manufactured by Daicel Chemical Industries, Ltd., and a resin can be arbitrarily selected according to the use and characteristics.
In general, it is preferable to use an aliphatic polyester having a glass transition point of 30 ° C. or lower. When it exceeds 30 ° C., sufficient antistatic property may not be obtained.

Polyether-based amide resins can also be used as the (co) polymer having a segment having an alkylene ether and / or ester as a basic repeating unit.
The polyether-based amide resin is one type of high-molecular nonionic surfactant having a polyether segment, and specific examples thereof include polyether ester amide resins and polyether amide imide resins. Specifically, antistatic elastomers obtained by copolymerizing an ether segment and an amide segment, such as an ethylene glycol / amide copolymer, an ethylene glycol / methacrylate copolymer, and an ethylene glycol / ester amide copolymer. Of these, polyether ester amide resins derived from polyamides having carboxyl groups at both ends and alkylene oxide adducts of bisphenols and / or polyoxyalkylene glycols are preferred.

Polysulfide thermoplastic elastomer by polycondensation reaction of polyacrylonitrile, triadisodithiol compound and aliphatic dihalide as a (co) polymer having a segment having at least one of amine, sulfide, and acrylonitrile as a basic repeating unit And polyamines and non-proteinaceous aliphatic compounds used as main raw materials for polyurea resins.
The glass transition point (Tg) of the (co) polymer used for the surface treatment of the inorganic filler is preferably 40 ° C. or lower, more preferably 25 ° C. or lower. When Tg exceeds 40 ° C., sufficient conductivity cannot be obtained under a normal use environment.

The surface treatment method of the inorganic filler with the (co) polymer having a segment having any one or more of alkylene ether, ester, amine, sulfide, and acrylonitrile as a basic repeating unit is not particularly limited.
For example, a method of treating the surface with a water-soluble cationic or anionic polymer surfactant exemplified in JP-A-10-176079 can be used.
Examples of the water-soluble cationic and anionic polymer surfactants include first, second and third amine salt type cationic low molecular weight surfactants, polymer surfactants and quaternary ammonium salt type cationic low molecular surfactants. Or a polymeric surfactant.

In the case of obtaining the component (b) of the present invention, for example, it has a segment having at least one of alkylene ether, ester, amine, sulfide, and acrylonitrile as a basic repeating unit with respect to 100 parts by weight of the inorganic filler (both ) The polymer is preferably blended in an amount of 0.5 to 15 parts by weight, more preferably 1 to 10 parts by weight.
If the (co) polymer having a segment as the basic repeating unit is less than 0.5 parts by weight, the conductivity is insufficient, and the (co) polymer having a segment as the basic repeating unit is 15 parts by weight. Exceeding, the stickiness of the filler becomes stronger, causing problems in supply, and the effect of plasticizing the matrix resin is added, the mechanical properties are lowered, and the electrical properties are good, but the molding shrinkage ratio is large, There is deformation and is not suitable for precision molded products.
Specifically, for example, a method in which the inorganic filler and the (co) polymer are dissolved in an organic solvent and mixed using a Henschel mixer, a ribbon mixer, or the like can be given.
A preferred (co) polymer has a weight average molecular weight of 1,000 to 100,000, more preferably 5,000 to 50,000.
The component (b) of the present invention may optionally contain in advance one or more ionic components including alkali metal ions such as Li, Na, K and anions, which are the component (c).

  In the composition of the present invention, the use ratio of the (b) surface-treated inorganic filler is (a) 20 to 80 parts by weight of the component (b), assuming that the total amount of the component (a) and the component (b) is 100 parts by weight. 80 to 20 parts by weight of component, preferably (a) 30 to 70 parts by weight, (b) 70 to 30 parts by weight, more preferably (a) 40 to 60 parts by weight, (b) 60 to 40 parts by weight Part. When the blending ratio of the component (b) exceeds 80 parts by weight, the electric characteristics are good, but the workability, the appearance are deteriorated, and the mechanical characteristics are deteriorated. On the other hand, if the component (b) is less than 20 parts by weight, the electrical characteristics are insufficient.

(C) The cation constituting the metal salt is selected from the group consisting of Li ⁺ , Na ⁺ , K ⁺ , Mg ²⁺ and Ca ²⁺ . Li ⁺ and Na ⁺ having a small ionic radius are preferable, and lithium Li ⁺ is particularly preferable. The anion which is a component of the metal salt (c) of the present invention is Cl ⁻ , Br ⁻ , F ⁻ , I ⁻ , NO ₃ ⁻ , SCN ⁻ , ClO ₄ ⁻ , CF ₃ SO ₃ ⁻ , BF ₄ ^−. , (CF ₃ SO ₂ ) ₂ N ⁻ , (CF ₃ SO ₂ ) ₃ C ⁻ , the preferred anion species used in the present invention is CF ₃ SO ₃ ⁻ , (CF ₃ SO ₂ ). ₂ N ⁻ , (CF ₃ SO ₂ ) ₃ C ⁻ . The preferred anionic species has the advantage of promoting the dissociation of the cation and producing an effect with a smaller addition amount.

There are many metal salts composed of the above cation and anion. Among them, lithium trifluoromethanesulfonate, sodium trifluoromethanesulfonate, lithium bis (trifluoromethanesulfonyl) imidolithium Li · N (CF ₃ SO ₂ ) ₂ , bis (Trifluoromethanesulfonyl) imido sodium Na.N (CF ₃ SO ₂ ) ₂ , tris (trifluoromethanesulfonyl) methide lithium Li · C (CF ₃ SO ₂ ) ₃ , tris (trifluoromethanesulfonyl) methide sodium Na · C ( Preferably CF ₃ SO ₂ ) ₃ is used. Since the specific resistance of the resin composition is lowered only by adding a small amount of these, the above-described effect is further exhibited. The composition of the present invention contains at least one of these metal salts.

  The metal salt component (c) produced using the above raw materials is dissolved in 5 to 100 parts by weight with respect to 100 parts by weight of water and / or alcohol solvent, and in the state of solution (a) + (b) Is blended into. The blending amount is preferably 0.01 to 20 parts by weight, more preferably 0.1 to 20 parts by weight, particularly preferably 0, as (c) metal salt with respect to (a) + (b) = 100 parts by weight. .5 to 10 parts by weight. If the amount is less than 0.1 parts by weight, it is difficult to obtain sufficient conductivity, processing characteristics, and surface appearance improvement. On the other hand, if the amount exceeds 20 parts by weight, the viscosity of the resulting composition increases remarkably, making molding difficult. In addition, the mechanical properties and thermal stability of the resin are impaired, and physical properties are degraded.

(D) Examples of water and / or alcohol solvents include solvent systems containing water as a main component, those using water alone as a solvent, general water, pure water, distilled water, or ion exchange water. It is done. The alcohol solvent means a solvent system containing alcohol as a main component, and includes C _{1 to} C ₄ alcohols such as methanol, ethanol, isopropanol, n-butanol, and isobutanol. Water and alcohol solvents may be used in combination. Further, a hydrophilic (particularly water-soluble) organic solvent such as acetone may be added to these solvents.

  The (d) water and / or alcohol solvent solution for dissolving the component (C) used in the present invention is effective in promoting the solubility, dissociation stability, and electrical conductivity of the metal salt in the composition of the present invention. There is.

The composition from which the solvent which is the 2nd composition of this invention was removed melt-kneaded the antistatic resin composition which mix | blended (a) component and (b) component with the solution of (c) metal salt. The water and / or alcohol solvent can be removed by volatilization.
Melt-kneading can be carried out without problems using ordinary equipment and equipment used for mixing and kneading ordinary thermoplastic resins.
Specifically, component solutions (a) to (c) and other components are charged into a premixer such as a tumbler or a Henschel mixer and mixed uniformly. Thereafter, the mixture is supplied to an extruder, melted and kneaded, extruded from a die, and pelletized by a pelletizer. As the extruder, a single shaft with a vent, a biaxial different direction, and a biaxial same direction extruder are desirable. Further, instead of the extruder, a kneader such as a super mixer, a Banbury mixer, a kneader, a tumbler, or a kneader may be used.
The kneading temperature is preferably 100 to 280 ° C, more preferably 120 to 250 ° C.

  An electrolyte dissolved in water and / or an alcohol-based solvent is added in the course of producing a compound. When a composition containing such an electrolyte solution is melt-kneaded by heating and pressurization, hydroalcohol is selectively used in this step. Since only the system solvent is removed, the migration is significantly improved. Further, water and alcohol solvents cannot be completely removed by volatilization in the process of producing a compound, and even if a trace amount remains, most of them are removed out of the system during the molding process, so that the contact transferability is remarkably improved.

  In the antistatic resin composition of the present invention, other inorganic fillers, stabilizers, colorants, reinforcing rubbers, elastomer components, plasticizers, dispersants, UV absorbers, etc., unless the object of the present invention is impaired. Additives such as additives, antioxidants, flame retardants, stabilizers, reinforcing agents, lubricants, foaming agents, weathering (light) agents, metal powders and the like can be optionally blended depending on the purpose.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention, this invention is not limited by these Examples. In the examples, parts and% are based on weight unless otherwise specified.

Various components used in Examples and Comparative Examples are as follows.
(A) a thermoplastic resin;
Polypropylene resin: manufactured by Tosoh Corporation, trade name block PP, PN640 (in the table, “PP”)
(B) component;
Grafted surface of calcium carbonate with alkylene ether polymer: manufactured by Pfematech Co., Ltd., trade name: AFF-EML33re11, average particle size: 1.0 μm (“Filler-A” in the table)
Grafted alkylene ether polymer on the surface of calcium carbonate and blended with chlorine-based Li salt (lithium chloride): manufactured by Pfematech Co., Ltd., trade name: AFF-EML33, average particle size: 1.0 μm, Li salt amount: 3% ("Filler-B" in the table)
What has not grafted the alkylene ether polymer to the surface of calcium carbonate: manufactured by Pfematech Co., Ltd., trade name: AFF-95, average particle size: 0.9 μm (“Filler-C” in the table)
(C) component;
Bis (trifluoromethanesulfonyl) imidolithium: Li · N (CF ₃ SO ₂ ) ₂
(C) To prepare components; (d) distilled water and dibutoxyethoxyethyl adipate (Asahi Denka) were used.

Examples 1-11, Comparative Examples 1-19 (Preparation of composition pellets)
According to the formulation of Tables 1-3, (a) thermoplastic resin, (b) component shown in Tables 1-3, and (d) component (c) prepared with water and / or alcohol solvent are preliminarily prepared by a tumbler mixer. The mixture was dry blended and melt mixed at 180 to 220 ° C. using a 47 mm same-direction twin screw extruder. The string-shaped resin melt mixture that came out of the die of the extruder was cooled in a water tank and passed through a cutter to prepare pellets of the antistatic resin composition. In this production process, (d) the component (c) prepared with water and / or alcohol solvent is melt-mixed at 180 to 220 ° C. by a twin screw extruder, and (d) water and / or alcohol solvent is mixed. Only the solvent was volatilized off.
Preparation of test specimens for evaluation;
The sample pellets prepared above were used for injection molding by an injection molding machine with a clamping pressure of 80 ton / cm ² to form a test piece plate of width 6 × length 6 × thickness 0.3 (cm). The molding conditions were a cylinder temperature of 180 to 220 ° C and a mold temperature of 40 to 60 ° C.

Volume resistivity value Using the above-prepared test piece, measurement was performed according to ASTM D257 using Hiresta manufactured by Mitsubishi Chemical Corporation.

Variation in volume resistivity value When measuring volume resistivity value, there is variation in volume resistivity when measured by changing the position of the specimen plate. Even when the position of the test piece plate was changed, the volume resistivity value was constant and stable, and the variation was evaluated as “none”.

Evaluation of contact transferability As a contact material, OPLAS RED330 manufactured by Orient Chemical Co., Ltd. was placed on the surface of the test piece plate as a dye-based colorant and treated under the following conditions.
25 ° C x 50% relative humidity x 24 hours
30 ° C x 80% relative humidity x 24 hours
After standing at 40 ° C. × 80% relative humidity × 24 hours, the colorant was removed, and the contamination state on the surface of the test piece plate was determined as follows.
The migration of the colorant component to the surface of the test piece plate was evaluated as follows.
Clearly and strongly recognized; ×
Slightly recognized;
Level that is difficult to see; ○
Not allowed; ◎
○ and ◎ are usable levels
Formability and surface appearance The determination of the formability surface appearance of the prepared test piece plate was made visually. Problems such as short shot, rough surface, jetting mark, and color burn (yellowing) due to staying in the cylinder for 10 minutes were evaluated according to the following criteria.
X: Two or more defects exist.
Δ: One defect exists.
Y: Usable level.
A: There is no defect at all.

  The antistatic resin composition of the present invention can be suitably used for OA equipment, home appliance field, electrical / electronic field, vehicle field, other various parts, housings, packages, and the like, taking advantage of its excellent characteristics.

Claims (4)

(A) 20-80 parts by weight of thermoplastic resin and / or unvulcanized rubber, (b) at least one (co) selected from the group consisting of polyalkylene ether, polyester, polyamine, polysulfide, and polyacrylonitrile on the surface. 80 to 20 parts by weight of an inorganic filler coated with a polymer (where (a) + (b) = 100 parts by weight), and (c) 5 to 100 parts by weight of a metal salt described below are added to (d) water and / or Alternatively, a solution dissolved in 100 parts by weight of an alcohol solvent is blended so as to be 0.01 to 20 parts by weight as a metal salt with respect to (a) + (b) = 100 parts by weight. Electric resin composition.
(C) Metal salt: a cation selected from the group consisting of Li ⁺ , Na ⁺ , K ⁺ , Mg ²⁺ and Ca ²⁺ and Cl ⁻ , Br ⁻ , F ⁻ , I ⁻ , NO ₃ ⁻ , SCN ⁻ , ClO. _{^{4 -, CF 3 SO 3 -}} , BF 4 -, (CF 3 SO 2) 2 N - and _{(CF 3 SO 2) 3 C} - metal salt composed of an anion selected from the group consisting of   An antistatic resin composition obtained by volatilizing and removing water and / or an alcohol solvent from the antistatic resin composition according to claim 1.   The antistatic device according to claim 1 or 2, wherein the component (c) is at least one selected from the group consisting of lithium trifluoromethanesulfonate, lithium bis (trifluoromethanesulfonyl) imide, and lithium tris (trifluoromethanesulfonyl) methide. Resin composition. (A) 20-80 parts by weight of thermoplastic resin and / or unvulcanized rubber, (b) at least one (co) selected from the group consisting of polyalkylene ether, polyester, polyamine, polysulfide, and polyacrylonitrile on the surface. 80 to 20 parts by weight of an inorganic filler coated with a polymer (where (a) + (b) = 100 parts by weight) is added 5 to 100 parts by weight of the above (c) metal salt with (d) water and / or Alternatively, a solution dissolved in 100 parts by weight of an alcohol solvent is blended so as to be 0.01 to 20 parts by weight as a metal salt with respect to (a) + (b) = 100 parts by weight. 3. The process for producing an antistatic resin composition according to claim 2, wherein (d) water and / or alcohol solvent is removed by volatilization by melt kneading.