JP2014196379A - Polypropylene resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polypropylene resin composition which allows the amounts of the formaldehyde and acetaldehyde to be radiated therefrom to be made smaller and which has excellent antistatic properties, and a molding product consisting of the same.SOLUTION: A polypropylene resin composition contains a propylene-polymerized material (component (A)), an ethylene-α-olefin copolymer (component (D)), an inorganic filler (component (E)), 0.45-0.7 pts. wt. of the following antistatic agent (component (B)), and 0.02-1 pts. wt. of a hindered amine-based light stabilizer (component (C)). The antistatic agent comprises: at least one compound (component (i)) selected from the group consisting of monoglycerin fatty acid esters and diglycerin fatty acid esters; and alkyl diethanolamine (component (ii)) and has 1/0.01-1/0.32 of a weight ratio ((component (i))/(component (ii)).

Description

  The present invention relates to a polypropylene resin composition and a molded body comprising the same. More specifically, the present invention relates to a propylene resin composition having a small amount of formaldehyde and acetaldehyde and excellent in antistatic properties, and a molded article comprising the same.

  Polypropylene resin is used in automobile interior and exterior materials, electrical component boxes, and the like, and it is known to add an antistatic agent to polypropylene resin to prevent the polypropylene resin from being charged.

  For example, Patent Document 1 discloses that a glycerin monoester and an amine compound having a specific molecular structure are in a ratio of 1 / 0.01 to 1 / 0.5 in weight ratio to 100 parts by weight of polyolefin resin in total. A polyolefin resin containing 0.1 to 5 parts by weight is disclosed.

  Patent Document 2 contains a fatty acid ester and an alkyldiethanolamine in a ratio of 1 / 0.03 to 1 / 0.11 in total of 0.01 to 2.0 parts by weight with respect to 100 parts by weight of propylene resin. A propylene resin composition is disclosed.

JP 2003-82169 A JP-A-10-292072

  However, further improvements have been desired for the amount of formaldehyde and acetaldehyde emitted from the resin composition and the antistatic property of the resin composition described in the above patent document.

  Under such circumstances, an object of the present invention is to provide a propylene resin composition having a small amount of formaldehyde and acetaldehyde and having excellent antistatic properties, and a molded article comprising the same.

One aspect of the present invention is a propylene polymerized material (component (A)) 100 to 50 parts by weight,
0-25 parts by weight of an ethylene-α-olefin copolymer (component (D)),
Containing 0 to 25 parts by weight of inorganic filler (component (E)) (the total amount of component (A), component (D) and component (E) is 100 parts by weight),
With respect to 100 parts by weight of the total amount of component (A), component (D), and component (E),
0.45 to 0.7 parts by weight of the following antistatic agent (component (B)),
The present invention relates to a polypropylene resin composition having 0.02 to 1 part by weight of the following hindered amine light stabilizer (component (C)).
Antistatic agent (component (B)):
At least one compound (component (i)) selected from the group consisting of fatty acid esters of monoglycerol and fatty acid esters of diglycerol;
Consisting of alkyl diethanolamine (component (ii)),
The antistatic agent whose weight ratio (component (i) / component (ii)) of component (i) and component (ii) is 1 / 0.01-1 / 0.32.
Hindered amine light stabilizer (component (C)):
Having 2,2,6,6-tetramethylpiperidyl group,
The acid dissociation constant (pKa) is less than 8,
A hindered amine light stabilizer having a weight reduction rate of less than 10% by weight measured by thermogravimetric analysis at a temperature of 300 ° C. and a nitrogen gas atmosphere (the total weight of the hindered amine light stabilizer is 100% by weight).

  A second aspect of the present invention relates to a molded body made of the above polypropylene resin composition.

  According to the present invention, it is possible to obtain a propylene resin composition having a small amount of formaldehyde and acetaldehyde diffused and excellent in antistatic properties and a molded body comprising the same.

[Propylene polymerized material (component (A))]
The propylene polymerized material (component (A)) used in the present invention is:
Propylene homopolymer, or
Random copolymer of propylene and other monomers, or
It is a propylene polymerized material comprising a propylene polymer component and a copolymer component of propylene and another olefin, and obtained by multistage polymerization.
These may be used alone or in combination of two or more.

  As a random copolymer, from a random copolymer composed of a structural unit derived from propylene and a structural unit derived from ethylene, a structural unit derived from propylene and a structural unit derived from an α-olefin having 4 or more carbon atoms. Or a random copolymer comprising a structural unit derived from propylene, a structural unit derived from ethylene, and a structural unit derived from an α-olefin having 4 or more carbon atoms.

  The propylene polymer material, which is composed of a propylene polymer component and a copolymer component of propylene and another olefin, and obtained by multistage polymerization, comprises a propylene polymer component, ethylene and an α-olefin having 4 to 10 carbon atoms. Examples thereof include a propylene polymerized material comprising a copolymer component composed of a structural unit derived from an olefin selected from the group and a structural unit derived from propylene, and obtained by multistage polymerization.

The propylene polymerized material (component (A)) has an isotactic pentad fraction ([mmmm]) measured by ¹³ C-NMR from the viewpoint of improving the balance between the tensile strength and impact resistance of the molded product. Is preferably 0.97 or more, and more preferably 0.98 or more.
[Mmmm] is the fraction of the propylene monomer unit at the center of the isotactic chain in the pentad unit in the polypropylene molecular chain, in other words, the chain in which five propylene monomer units are continuously meso-bonded. The closer it is, the more the propylene polymerized material (component (A)) is an index indicating that it is a highly crystalline polymer having a molecular structure exhibiting high stereoregularity.

The measurement method of [mmmm] is as follows. Zambelli et al., Macromolecules, 6, 925 (1973), specifically isotactic as the area fraction of the mmmm peak in the total absorption peak of the methyl carbon region of the ¹³ C-NMR spectrum. Measure the pentad fraction. In the case where the propylene polymer material (component (A)) is the above random copolymer or the above block copolymer material, the structural unit derived from propylene contained in the random copolymer or the copolymer material. Use the value measured for the chain. However, the assignment of the NMR absorption peak is performed based on Macromolecules, 8, 687 (1975).

  The melt mass flow rate (referred to as MFR) of the propylene polymerized material (component (A)) measured at 230 ° C. under a load of 2.16 kg improves the balance between the tensile strength and impact resistance of the molded body, From the viewpoint of improving the moldability of the resin composition, it is preferably 0.05 to 500 g / 10 minutes, more preferably 1 to 120 g / 10 minutes, and 1 to 90 g / 10 minutes. More preferably it is.

The propylene polymerized material (component (A)) can be produced by the following polymerization method using a polymerization catalyst.
Examples of the polymerization catalyst include a Ziegler type catalyst system, a Ziegler-Natta type catalyst system, a catalyst system comprising a transition metal compound of Group 4 of the periodic table having a cyclopentadienyl ring and an alkylaluminoxane, or a cyclopentadienyl ring. Periodic table having a cyclopentadienyl ring in inorganic particles such as silica, clay minerals, catalyst systems composed of compounds and organoaluminum compounds that react with group 4 transition metal compounds and ionic complexes. A catalyst system in which a catalyst component such as a Group 4 transition metal compound, a compound forming an ionic complex, and an organoaluminum compound is supported and modified, and in the presence of the above catalyst system, propylene, A prepolymerized catalyst prepared by prepolymerizing ethylene or α-olefin may be used.
Examples of the catalyst system include JP-A-61-218606, JP-A-5-194485, JP-A-7-216071, JP-A-9-316147, JP-A-10-212319, Examples thereof include a catalyst system described in JP-A-2004-182981.

Examples of the polymerization method include bulk polymerization, solution polymerization, slurry polymerization, and gas phase polymerization. Here, bulk polymerization refers to a method in which polymerization is performed using a liquid olefin as a medium at the polymerization temperature, and solution polymerization or slurry polymerization refers to inert hydrocarbons such as propane, butane, isobutane, pentane, hexane, heptane, and octane. A method for carrying out polymerization in a solvent. Gas phase polymerization is a method in which a gaseous monomer is used as a medium, and the gaseous monomer is polymerized in the medium.
These polymerization methods may be either a batch type or a multi-stage type in which a plurality of polymerization reaction vessels are connected in series, and these polymerization methods may be arbitrarily combined. Preferred is a continuous gas phase polymerization method, or a bulk-gas phase polymerization method in which a bulk polymerization method and a gas phase polymerization method are continuously performed.
Various conditions in the polymerization step (polymerization temperature, polymerization pressure, monomer concentration, catalyst input amount, polymerization time, etc.) may be appropriately determined according to the target propylene polymerization material (component (A)).

  In the production of propylene polymerized material (component (A)), in order to remove residual solvent contained in the propylene polymerized material (component (A)), ultra-low molecular weight oligomers produced as a by-product during production, etc. The propylene polymerized material (component (A)) may be dried at a temperature below the temperature at which the propylene polymerized material (component (A)) melts. Examples of the drying method include the methods described in JP-A Nos. 55-75410 and 2556553.

[Random copolymer]
The random copolymer used in the present invention is derived from a random copolymer composed of a structural unit derived from propylene and a structural unit derived from ethylene, a structural unit derived from propylene, and an α-olefin having 4 or more carbon atoms. A random copolymer composed of structural units, a random copolymer composed of structural units derived from propylene, structural units derived from ethylene, and structural units derived from an α-olefin having 4 or more carbon atoms.
The α-olefin having 4 or more carbon atoms constituting the random copolymer is preferably an α-olefin having 4 to 10 carbon atoms, such as 1-butene, 1-pentene, 1-hexene, 4-methyl. Examples include -1-pentene, 1-octene, 1-decene, and the like, preferably 1-butene, 1-hexene, and 1-octene.

Examples of the random copolymer comprising a structural unit derived from propylene and a structural unit derived from an α-olefin having 4 or more carbon atoms include, for example, propylene-1-butene random copolymer, propylene-1-hexene random copolymer Examples thereof include a compound, propylene-1-octene random, and propylene-1-decene random copolymer.
Examples of the random copolymer comprising a structural unit derived from propylene, a structural unit derived from ethylene, and a structural unit derived from an α-olefin having 4 or more carbon atoms include, for example, propylene-ethylene-1-butene copolymer, propylene -Ethylene-1-hexene copolymer, propylene-ethylene-1-octene, propylene-ethylene-1-decene copolymer and the like.

  In the random copolymer composed of the structural unit derived from propylene and the structural unit derived from ethylene, the content of the structural unit derived from ethylene is preferably 0, with the total weight of the random copolymer being 100% by weight. 0.1 to 40% by weight, more preferably 0.1 to 30% by weight, still more preferably 2 to 15% by weight. Content of the structural unit derived from propylene becomes like this. Preferably it is 99.9-60 weight%, More preferably, it is 99.9-70 weight%, More preferably, it is 98-85 weight%.

  In the random copolymer composed of the structural unit derived from propylene and the structural unit derived from an α-olefin having 4 or more carbon atoms, the content of the structural unit derived from the α-olefin having 4 or more carbon atoms is selected from random copolymers. The total amount of the polymer is 100% by weight, preferably 0.1 to 40% by weight, more preferably 0.1 to 30% by weight, still more preferably 2 to 15% by weight. Content of the structural unit derived from propylene becomes like this. Preferably it is 99.9-60 weight%, More preferably, it is 99.9-70 weight%, More preferably, it is 98-85 weight%.

  In the random copolymer consisting of the structural unit derived from propylene, the structural unit derived from ethylene, and the structural unit derived from an α-olefin having 4 or more carbon atoms, the content of the structural unit derived from ethylene is selected from The total amount of the polymer is 100% by weight, preferably 0.1 to 30% by weight, more preferably 0.1 to 20% by weight, still more preferably 1 to 10% by weight. Further, the content of the structural unit derived from the α-olefin having 4 or more carbon atoms is preferably 0.1 to 30% by weight, more preferably 0.1 to 20% by weight, and further preferably 1 to 10% by weight. Further, the content of the structural unit derived from propylene is preferably 99.8 to 40% by weight, more preferably 99.8 to 60% by weight, and still more preferably 98 to 80% by weight.

[Propylene polymerized material obtained by multistage polymerization]
The propylene polymerized material obtained by the multistage polymerization used in the present invention is:
A propylene polymer material comprising a propylene polymer component and a copolymer component of propylene and another olefin, and obtained by multistage polymerization.
Preferably, obtained by multistage polymerization,
A propylene polymer component (referred to as polymer component (I));
From a copolymer component (referred to as polymer component (II)) composed of a structural unit derived from an olefin selected from the group consisting of ethylene and an α-olefin having 4 to 10 carbon atoms and a structural unit derived from propylene. It is a propylene polymerized material obtained by multistage polymerization.
The polymer component (I) is a propylene homopolymer component, or a structural unit derived from at least one olefin selected from the group consisting of ethylene and an α-olefin having 4 to 10 carbon atoms. It is a propylene copolymer component consisting of less than 80% by weight and more than 80% by weight of structural units derived from propylene and 99.99% by weight or less (provided that the total weight of the polymer component (I) is 100% by weight) ).
The α-olefin having 4 to 10 carbon atoms used for the polymer component (I) is preferably 1-butene, 1-hexene or 1-octene, more preferably 1-butene.

  Propylene copolymer component comprising a constituent unit derived from at least one olefin selected from the group consisting of ethylene and an α-olefin having 4 to 10 carbon atoms and a constituent unit derived from propylene. As, for example, propylene-ethylene copolymer component, propylene-1-butene copolymer component, propylene-1-hexene copolymer component, propylene-1-octene copolymer component, propylene-ethylene-1-butene Examples include a copolymer component, a propylene-ethylene-1-hexene copolymer component, and a propylene-ethylene-1-octene copolymer component.

  The polymer component (I) is preferably a propylene homopolymer component, a propylene-ethylene copolymer component, a propylene-1-butene copolymer component, or a propylene-ethylene-1-butene copolymer component. .

The polymer component (II) is composed of 20 to 80% by weight of a structural unit derived from at least one olefin selected from the group consisting of ethylene and an α-olefin having 4 to 10 carbon atoms, and a structural unit derived from propylene. It is a copolymer component having 80 to 20% by weight (provided that the total weight of the polymer component (II) is 100% by weight).
As content of the structural unit derived from the at least 1 sort (s) of olefin selected from the group which consists of ethylene and a C4-C10 alpha olefin contained in polymer component (II), Preferably it is 20-60 weight %, More preferably 30 to 60% by weight.

  Examples of the α-olefin having 4 to 10 carbon atoms in the polymer component (II) include the same α-olefin as the α-olefin having 4 to 10 carbon atoms in the polymer component (I).

  Examples of the polymer component (II) include a propylene-ethylene copolymer component, a propylene-ethylene-1-butene copolymer component, a propylene-ethylene-1-hexene copolymer component, and propylene-ethylene-1-octene. Copolymer component, propylene-ethylene-1-decene copolymer component, propylene-1-butene copolymer component, propylene-1-hexene copolymer component, propylene-1-octene copolymer component, propylene-1 -Decene copolymer component, etc., preferably propylene-ethylene copolymer component, propylene-1-butene copolymer component, propylene-ethylene-1-butene copolymer component, more preferably propylene- It is an ethylene copolymer component.

  It is preferable that the content of the polymer component (II) in the propylene polymer material obtained by the multistage polymerization is 1 to 50% by weight, comprising the polymer component (I) and the polymer component (II). More preferably, it is 10 to 40% by weight, most preferably 10 to 30% by weight (however, the polymer component (I) and the polymer component (II)) The total weight of the total weight of 100%).

  When the polymer component (I) of the propylene polymer material obtained by multistage polymerization is a propylene homopolymer component comprising the polymer component (I) and the polymer component (II), the propylene polymer material (component (A)) As, for example, (propylene)-(propylene-ethylene) polymerized material, (propylene)-(propylene-ethylene-1-butene) copolymerized material, (propylene)-(propylene-ethylene-1-hexene) polymerized material, (Propylene)-(propylene-ethylene-1-octene) polymerized material, (propylene)-(propylene-1-butene) polymerized material, (propylene)-(propylene-1-hexene) polymerized material, (propylene)-(propylene) -1-octene) polymerized material, (propylene)-(propylene-1-decene) polymerized material, and the like.

  Moreover, the group which consists of polymer component (I) and polymer component (II), and the polymer component (I) of the propylene polymer material obtained by multistage polymerization consists of ethylene and a C4-C10 alpha olefin. In the case of a polymer component composed of a structural unit derived from at least one olefin selected from the above and a structural unit derived from propylene, as the propylene polymerized material (component (A)), for example, (propylene-ethylene) -(Propylene-ethylene) polymerized material, (propylene-ethylene)-(propylene-ethylene-1-butene) polymerized material, (propylene-ethylene)-(propylene-ethylene-1-hexene) polymerized material, (propylene-ethylene) -(Propylene-ethylene-1-octene) polymerized material, (propylene-ethylene)-(propylene-ethylene-1) -Decene) polymerized material, (propylene-ethylene)-(propylene-1-butene) polymerized material, (propylene-ethylene)-(propylene-1-hexene) polymerized material, (propylene-ethylene)-(propylene-1-octene) ) Polymerized material, (propylene-ethylene)-(propylene-1-decene) polymerized material, (propylene-1-butene)-(propylene-ethylene) polymerized material, (propylene-1-butene)-(propylene-ethylene-1) -Butene) polymerized material, (propylene-1-butene)-(propylene-ethylene-1-hexene) polymerized material, (propylene-1-butene)-(propylene-ethylene-1-octene) polymerized material, (propylene-1 -Butene)-(propylene-ethylene-1-decene) polymerized material, (propylene-1-butene)-(propylene) (Pyrene-1-butene) polymerized material, (propylene-1-butene)-(propylene-1-hexene) polymerized material, (propylene-1-butene)-(propylene-1-octene) polymerized material, (propylene-1- Butene)-(propylene-1-decene) polymerized material, (propylene-1-hexene)-(propylene-1-hexene) polymerized material, (propylene-1-hexene)-(propylene-1-octene) polymerized material, Propylene-1-hexene)-(propylene-1-decene) polymerized material, (propylene-1-octene)-(propylene-1-octene) polymerized material, (propylene-1-octene)-(propylene-1-decene) Examples thereof include a polymerized material.

  As a propylene polymerized material comprising a polymer component (I) and a polymer component (II) and obtained by multistage polymerization, (propylene)-(propylene-ethylene) polymerized material, (propylene)-(propylene-ethylene) are preferred. -1-butene) polymerized material, (propylene-ethylene)-(propylene-ethylene) polymerized material, (propylene-ethylene)-(propylene-ethylene-1-butene) polymerized material, (propylene-1-butene)-(propylene) -1-butene) polymerized material, more preferably (propylene)-(propylene-ethylene) polymerized material.

The intrinsic viscosity ([η] _I ) measured in 135 ° C. tetralin of the polymer component (I) is 0.1 to 5 dl / g, preferably 0.3 to 4 dl / g, more preferably 0.5-3 dl / g.

The intrinsic viscosity ([η] _II ) measured in 135 ° C. tetralin of the polymer component (II) is 1 to 20 dl / g, preferably 1 to 10 dl / g, more preferably 2 to 7 dl / g. It is.

The ratio ([η] _II / [η] _I ) of the intrinsic viscosity ([η] _II ) of the polymer component (II) to the intrinsic viscosity ([η] _I ) of the polymer component ( _I ) is preferably It is 1-20, More preferably, it is 2-10, More preferably, it is 2-9.

The intrinsic viscosity (unit: dl / g) in the present invention is a value measured at a temperature of 135 ° C. using tetralin as a solvent by the following method.
Using a Ubbelohde viscometer, the reduced viscosity is measured at three points of concentrations of 0.1 g / dl, 0.2 g / dl and 0.5 g / dl. The intrinsic viscosity is a calculation method described in “Polymer Solution, Polymer Experiments 11” (published by Kyoritsu Shuppan Co., Ltd.), page 491. That is, the reduced viscosity is plotted against the concentration and the concentration is extrapolated to zero Obtained by extrapolation.

  When the propylene polymerized material (component (A)) is composed of the polymer component (I) and the polymer component (II) and is a propylene polymerized material obtained by multistage polymerization, the weight partially extracted from the preceding polymerization tank The intrinsic viscosity of the polymer component (I) or the polymer component (II) is obtained from the coalescence component, and the value of this intrinsic viscosity and the respective contents of the polymer component (I) or the polymer component (II) are used. The intrinsic viscosity of the other polymer component is calculated.

In addition, a propylene polymerized material comprising a polymer component (I) and a polymer component (II), which is obtained by multistage polymerization, produces the polymer component (I) in the previous polymerization step, and the polymer component (II) In the case of a propylene polymer material produced by the method of producing the latter in the subsequent step, the respective contents of the polymer component (I) and the polymer component (II) and the intrinsic viscosity ([η] _Total , [η] The measurement method and calculation procedure of _I , [η] _II ) are as follows. The intrinsic viscosity ([η] _Total ) indicates the intrinsic viscosity of the block copolymer material.

Limit of viscosity ([η] _I ) of polymer component (I) obtained in the former polymerization step, and limit of propylene polymer material consisting of polymer component (I) and polymer component (II) after the latter polymerization step From the viscosity ([η] _Total ) and the content of the polymer component (II) contained in the propylene polymer material, the intrinsic viscosity ([η] _II ) of the polymer component (II) is calculated from the following formula.
[Η] _II = ([η] _Total − [η] _I × X _I ) / X _II
[Η] _Total : Intrinsic viscosity (dl / g) of the propylene polymerized material after the subsequent polymerization step
[Η] _I : Intrinsic viscosity (dl / g) of the polymer component (I) extracted from the polymerization tank after the pre-stage polymerization step
X _I : Weight ratio of the polymer component (I) to the propylene polymer material X _II : Weight ratio of the polymer component (II) to the whole propylene polymer material Note that X _I and X _II are obtained from the mass balance at the time of polymerization. .

The weight ratio (X _II ) of the polymer component (II) to the propylene polymerized material comprising the polymer component (I) and the polymer component (II) and obtained by multi-stage polymerization is the polymer component (I) and the propylene It is also possible to measure the heat of crystal melting of the polymerized material and calculate it using the following formula. The amount of heat of crystal melting can be measured by differential scanning thermal analysis (DSC).
X _II = 1− (ΔHf) _Total / (ΔHf) _I
(ΔHf) _Total : heat of fusion of the propylene polymerized material (cal / g)
(ΔHf) _I : heat of fusion of polymer component (I) (cal / g)

Content of the unit derived from the comonomer of the polymer component (II) contained in the propylene polymerized material comprising the polymer component (I) and the polymer component (II) and obtained by multistage polymerization ((Cα ′) _II ) Measured the content ((Cα ′) _Total ) of the unit derived from the comonomer of the propylene polymerized material by an infrared absorption spectrum method, and obtained by calculation using the following formula.
(Cα ′) _II = (Cα ′) _Total / X _II
(Cα ′) _Total : Content of units derived from the comonomer of the propylene polymerized material (% by weight)
(Cα ′) _II : Content of units derived from the comonomer of the polymer component (II) (% by weight)

  A method for producing a propylene polymerized material comprising a polymer component (I) and a polymer component (II), which is obtained by multistage polymerization, comprises producing a polymer part (I) in the first step, and polymer part (II). In the second step, and the polymerization catalyst described above can be used for the polymerization.

Also, a propylene homopolymer that is a propylene polymerized material (component (A)), or
Random copolymer of propylene and other monomers, or
Propylene polymer material consisting of polymer component (I) and polymer component (II), obtained by multistage polymerization,
A propylene polymerized material obtained by decomposing by mixing an organic peroxide and melt-kneading may be used. By using the organic peroxide, the fluidity can be improved without impairing the dispersibility of the antistatic agent (B) and the hindered amine light stabilizer (C) contained in the polypropylene resin composition.

  Examples of the organic peroxide include alkyl peroxides, diacyl peroxides, peroxide esters, and carbonates.

  Examples of alkyl peroxides include dicumyl peroxide, di-tert-butyl peroxide, di-tert-butylcumyl peroxide, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexane. 2,5-dimethyl-2,5-di (tert-butylperoxy) hexyne-3, tert-butylcumyl, 1,3-bis (tert-butylperoxyisopropyl) benzene, 3,6,9-triethyl- 3,6,9-trimethyl-1,4,7-triperoxonane and the like can be mentioned.

  Examples of the diacyl peroxides include benzoyl peroxide, lauroyl peroxide, decanoyl peroxide, and the like. Examples of peroxide esters include 1,1,3,3-tetramethylbutylperoxyneodecanoate, α-cumylperoxyneodecanoate, tert-butylperoxyneodecanoate, and tert-butyl. Peroxyneoheptanoate, tert-butyl peroxypivalate, tert-hexyl peroxypivalate, 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate, tert-amyl peroxyl- 2-ethylhexanoate, tert-butylperoxy-2-ethylhexanoate, tert-butylperoxyisobutyrate, di-tert-butylperoxyhexahydroterephthalate, tert-amylperoxy3,5,5 -Trimethylhexanoate, tert-butyl Oxy 3,5,5-trimethyl hexanoate, tert- butylperoxy acetate, tert- butyl peroxybenzoate, di - butylperoxy trimethyl Adi adipate, and the like.

  Examples of the peroxide carbonates include di-3-methoxybutyl peroxydicarbonate, di (2-ethylhexyl) peroxydicarbonate, diisopropyl peroxycarbonate, tert-butylperoxyisopropyl carbonate, and di (4-tert- Butylcyclohexyl) peroxydicarbonate, dicetylperoxydicarbonate, dimyristylperoxydicarbonate and the like.

  Of these, alkyl peroxides are preferably used, and 2,5-dimethyl-2,5-di (tert-butylperoxy) hexane, 1,3-bis (tert-butylperoxyisopropyl) benzene, 3, It is more preferable to use any of 6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxonan.

  The compounding amount of the organic peroxide is the sum of the propylene polymerized material (component (A)), the ethylene-α-olefin copolymer (component (D)), and the inorganic filler (component (E)) to be processed. Preferably it is 0.0001-0.5 weight part with respect to 100 weight part, More preferably, it is 0.0005-0.3 weight part, More preferably, it is 0.001-0.25 weight part. . When there is too much compounding quantity of an organic peroxide, the mechanical physical property of a molded object will fall.

The organic peroxide may be blended as it is, as a propylene polymerized material (component (A)) powder or other olefin resin powder mixed or impregnated at an arbitrary concentration (referred to as a master batch). You may mix | blend.
Examples of the other olefin resin include ethylene polymer, propylene polymer material different from propylene polymer material (component (A)), butene polymer, hydrogenated block copolymer, and the like. A propylene polymerized material different from the combined or propylene polymerized material (component (A)), more preferably a propylene polymerized material different from the propylene polymerized material (component (A)). As other olefin resins, these may be used alone or in combination of two or more.

[Antistatic agent (component (B))]
The antistatic agent (component (B)) used in the present invention is at least one ester compound (component (i)) selected from the group consisting of monoglycerin fatty acid ester and diglycerin fatty acid ester;
It consists of alkyldiethanolamine (component (ii)).

The fatty acid ester of monoglycerin which is an ester compound (component (i)) is an ester compound obtained from monoglycerin and a fatty acid, preferably monoglycerin monofatty acid ester obtained from monoglycerin and one kind of fatty acid A compound.
More preferably, a mono-fatty acid esters of the resulting monoglycerol from the one of a fatty acid monoglycerol and carbon atoms is selected from fatty acids of C ₁₆ -C _18, carbon atoms derived from fatty acids of C ₁₆ -C ₁₈ A monoglycerin monofatty acid ester having a constituent unit content of 50% by weight or more is preferred (however, the total weight of the monoglycerin monofatty acid ester is 100% by weight).
More preferred are monoglycerin monostearate and monoglycerin monopalmitate.

The fatty acid ester of diglycerin which is an ester compound (component (i)) is an ester compound obtained from diglycerin and a fatty acid, and preferably a mono fatty acid ester of diglycerin obtained from diglycerin and one kind of fatty acid. A compound.
More preferably, a diglycerin and one fatty acid and fatty acid monoester of diglycerol obtained from the carbon atoms is selected from fatty acids of C ₁₆ -C _18, carbon atoms derived from fatty acids of C ₁₆ -C ₁₈ A diglycerin monofatty acid ester having a constituent unit content of 50% by weight or more is preferred (however, the total weight of the diglycerin monofatty acid ester is 100% by weight).
More preferred are diglycerin monostearate and diglycerin monopalmitate.

As the ester compound (component (i)), the above-described ester compounds may be used alone, or at least two kinds may be used in combination. Preferably, monoglycerol monostearate, monoglycerol monopalmitate, diglycerol stearate, diglycerol palmitate, and the like can be used.
The ester compound (component (i)) is preferably at least two selected from the group consisting of monoglycerol stearate, monoglycerol palmitate, diglycerol stearate and diglycerol palmitate More preferably, it is a mixture of diglycerin monostearate and monoglycerin monostearate.

  The weight ratio (component (i) / component (ii)) of component (i) and component (ii) contained in the antistatic agent (component (B)) reduces the amount of formaldehyde and acetaldehyde emitted, and From the viewpoint of enhancing the excellent antistatic effect, component (i) / component (ii) = 1 / 0.01 to 1 / 0.32, preferably component (i) / component (ii) = 1 / 0.05 to 1 / 0.2, more preferably component (i) / component (ii) = 1 / 0.05 to 1 / 0.09.

[Hindered amine light stabilizer (component (C))]
The hindered amine light stabilizer (component (C)) used in the present invention has a 2,2,6,6-tetramethylpiperidyl group, an acid dissociation constant (pKa) of less than 8, and a temperature of 300 ° C. In addition, the compound has a weight reduction rate of less than 10% by weight measured by thermogravimetric analysis under a nitrogen gas atmosphere (the total weight of the hindered amine light stabilizer is 100% by weight).

  From the viewpoint of improving the weather resistance of the resin composition or a molded article comprising the same, the hindered amine light stabilizer (component (C)) is preferably 2,2,6,6-tetra A hindered amine light stabilizer containing a methylpiperidyl group, an oxygen atom or a nitrogen atom, and a 2,2,6,6-tetramethylpiperidyl group bonded to either an oxygen atom or a nitrogen atom, more preferably Is a hindered amine light stabilizer in which a 2,2,6,6-tetramethylpiperidyl group is bonded to a nitrogen atom.

The acid dissociation constant (pKa) of the hindered amine light stabilizer (component (C)) is less than 8,
From the viewpoint of improving the weather resistance and hue stability of the resin composition or a molded article comprising the same, it is preferably 7 or less. The acid dissociation constant (pKa) is an index indicating the intrinsic properties of a compound having a 2,2,6,6-tetramethylpiperidyl group, and is a known titration method (acid dissociation constant based on the Bronsted definition). This is a value obtained by the measurement method.

  The weight reduction rate of the hindered amine light stabilizer (component (C)) measured by thermogravimetric analysis at a temperature of 300 ° C. and under a nitrogen gas atmosphere is less than 10% by weight. Weight reduction from the viewpoint of suppressing mold contamination when molding a resin composition into a molded body, reducing the amount of formaldehyde and acetaldehyde emitted, and increasing the weather resistance of the resin composition and the molded body comprising the same. As a percentage, it is preferably less than 5% by weight, more preferably less than 3% by weight.

  The weight reduction rate by thermogravimetric analysis of the hindered amine light stabilizer (component (C)) used in the present invention is a value determined using a differential thermogravimetric simultaneous measurement apparatus (TG-DTA). Specifically, the temperature of the hindered amine light stabilizer (component (C)) is changed to 300 ° C. while changing the temperature by 10 ° C. per minute from room temperature in a nitrogen gas atmosphere (under a nitrogen stream at a flow rate of 100 ml / min). It is the weight reduction rate calculated | required by TG-DTA when making it reach | attain.

式（Ｃ１）
（式中、Ｒ¹は、炭素数１０から３０のアルキル基を表し、ｎは１より大きい整数を表す。） The hindered amine light stabilizer (component (C)) is preferably a copolymer material composed of a maleic imide derivative represented by the formula (C1).

Formula (C1)
(In the formula, R ¹ represents an alkyl group having 10 to 30 carbon atoms, and n represents an integer greater than 1.)

R ¹ in the above formula (C1) represents an alkyl group having 10 to 30 carbon atoms, preferably an alkyl group having 14 to 28 carbon atoms. R ¹ may be a linear alkyl group or a cyclic alkyl group, and is preferably a linear alkyl group.

The hindered amine light stabilizer (component (C)) used in the present invention is preferably a hindered amine light stabilizer represented by the general formula (C1) in which R ¹ is an alkyl group having 14 to 28 carbon atoms. More preferably, it is a hindered amine light stabilizer represented by the general formula (C1) in which R ¹ is an alkyl group having 16 to 26 carbon atoms, and more preferably, R ¹ is an alkyl having 18 to 22 carbon atoms. It is a hindered amine light stabilizer represented by the general formula (C1) as a group.

[Ethylene-α-olefin copolymer (component (D))]
The polypropylene resin composition of the present invention may contain an ethylene-α-olefin copolymer (component (D)). The ethylene-α-olefin copolymer (component (D)) is a copolymer composed of a structural unit derived from ethylene and a structural unit derived from an α-olefin having 4 to 20 carbon atoms. Examples of the α-olefin having 4 to 20 carbon atoms include 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene, 1-decene, 1-dodecene, Examples include 1-tetradecene, 1-hexadecene, 1-eicosene and the like. These α-olefins may be used alone or in combination of two or more. Among these, it is more preferable to use C4-C8 alpha olefins, such as 1-butene, 1-hexene, and 1-octene.

  Examples of the ethylene-α-olefin copolymer (component (D)) include ethylene-butene-1 random copolymer, ethylene-hexene-1 random copolymer, ethylene-octene-1 random copolymer, and the like. Preferably, it is an ethylene-octene-1 random copolymer or an ethylene-butene-1 random copolymer. These may be used alone or in combination of two or more.

The density of the ethylene-α-olefin copolymer (component (D)) is preferably 0.85 to 0.91 g / cm ³ from the viewpoint of increasing the rigidity and hardness of the molded article and impact resistance. More preferably, it is 0.85-0.88 g / cm < ³ >, More preferably, it is 0.855-0.875 g / cm < ³ >.

  The melt mass flow rate (referred to as MFR) of the ethylene-α-olefin copolymer (component (D)) measured at 230 ° C. and a load of 2.16 kgf in accordance with the provisions of JIS K-7210 is the resin composition at the time of molding. From the viewpoint of improving fluidity and improving the balance between the rigidity and impact resistance of the molded article, it is preferably 0.05 to 100 g / 10 minutes, more preferably 0.1 to 50.0 g. / 10 minutes. More preferably, it is 0.1-30 g / 10min.

  The content of the structural unit derived from ethylene contained in the ethylene-α-olefin copolymer (component (D)) is preferably 5 from the viewpoint of increasing the impact strength of the molded product, particularly increasing the low temperature impact strength. It is -95 mass%, More preferably, it is 10-90 mass%.

As a manufacturing method of an ethylene-alpha-olefin copolymer (component (D)), the method of manufacturing by copolymerizing ethylene and an alpha olefin using a well-known catalyst and a well-known polymerization method is mentioned.
Examples of the known catalyst include a catalyst system composed of a vanadium compound and an organoaluminum compound, a Ziegler-Natta catalyst system, or a metallocene catalyst system. Known polymerization methods include a solution polymerization method, a slurry polymerization method, and a high-pressure ion. Examples thereof include a polymerization method and a gas phase polymerization method.

  Examples of the metallocene catalyst include, for example, JP-A-3-16388, JP-A-4-268307, JP-A-9-12790, JP-A-9-87313, JP-A-11-80233, and special tables. Examples thereof include metallocene catalysts described in JP-A-10-508055. As a method for producing an ethylene-α-olefin copolymer (component (D)) using a metallocene-based catalyst, a method described in EP-A-1211287 is preferable.

[Inorganic filler (component (E))]
The polypropylene resin composition of the present invention may contain an inorganic filler (component (E)). Examples of the inorganic filler (component (E)) include particulate inorganic fillers such as calcium carbonate, barium sulfate, mica, crystalline calcium silicate, and talc; fibrous inorganic fillers such as fibrous magnesium oxysulfate; Is mentioned. As the particulate inorganic filler, talc is preferable. An inorganic filler may be used independently and may use 2 or more types together.

  Talc is hydrous magnesium silicate having a pyrophyllite type three-layer structure, and talc preferably used as an inorganic filler (component (E)) in the present invention is obtained by pulverizing hydrous magnesium silicate. is there. The talc is more preferably tabular particles obtained by finely pulverizing hydrous magnesium silicate molecule crystals to a unit layer level.

  The average particle diameter of the particulate inorganic filler (component (E)) is preferably 3 μm or less. The average particle diameter is a 50% equivalent particle diameter D50 obtained from an integral distribution curve of a sieving method measured by suspending in a dispersion medium that is water or alcohol using a centrifugal sedimentation type particle size distribution measuring device. Means.

  The average fiber length of the fibrous inorganic filler is preferably 5 to 50 μm, more preferably 10 to 30 μm. Moreover, as an average fiber diameter of a fibrous inorganic filler, Preferably it is 0.3-2 micrometers, More preferably, it is 0.5-1 micrometer. Here, the average fiber diameter and the average fiber of the fibrous inorganic filler are selected by randomly selecting 50 or more fibrous fillers from the image obtained by scanning electron microscope (SEM) observation, and the fiber diameter. And by measuring and averaging the fiber length.

  The inorganic filler may be used without treatment, or in order to improve the interfacial adhesion with the propylene polymerized material (component (A)) and the dispersibility to the propylene polymerized material (component (A)). The surface may be treated with a surfactant. Examples of the surfactant include silane coupling agents, titanium coupling agents, higher fatty acids, higher fatty acid esters, higher fatty acid amides, and higher fatty acid salts.

[Polypropylene resin composition]
The polypropylene resin composition of the present invention comprises 100 to 50 parts by weight of a propylene polymerized material (component (A)), 0 to 25 parts by weight of an ethylene-α-olefin copolymer (component (D)),
Containing 0 to 25 parts by weight of inorganic filler (component (E)) (the total amount of component (A), component (D) and component (E) is 100 parts by weight),
With respect to 100 parts by weight of the total amount of component (A), component (D), and component (E),
0.45 to 0.7 parts by weight of the antistatic agent (component (B)),
A polypropylene resin composition having 0.02 to 1 part by weight of the hindered amine light stabilizer (component (C)).

  In the polypropylene resin composition of the present invention, the content of the propylene polymerized material (component (A)) is 100 wt%, where the total content of component (A), component (D), and component (E) is 100 wt%. From the viewpoint of increasing the rigidity and impact strength of the molded product, it is preferably 98 to 50% by weight, more preferably 90 to 60% by weight.

  In the polypropylene resin composition of the present invention, the content of the ethylene-α-olefin copolymer (component (D)) is 100 weights of the total content of the components (A), (D), and (E). % Is 0 to 25% by weight, and preferably 1 to 25% by weight and more preferably 5 to 20% by weight from the viewpoint of enhancing the rigidity and impact strength of the molded body.

  In the polypropylene resin composition of the present invention, the content of the inorganic filler (component (E)) is 0 to From the viewpoint of increasing the rigidity and impact strength of the molded product, it is preferably 1 to 25% by weight, and more preferably 5 to 20% by weight.

  The content of the antistatic agent (component (B)) contained in the polypropylene resin composition of the present invention is reduced from the viewpoint of reducing the amount of formaldehyde and acetaldehyde emitted and obtaining an excellent antistatic effect. It is 0.45 weight part-0.7 weight part with respect to 100 weight part of total amounts of (D) and a component (E), Preferably it is 0.5 weight part-0.6 weight part.

  The blending amount of the hindered amine light stabilizer (component (C)) contained in the polypropylene resin composition of the present invention is such that the contamination of the mold is suppressed when the resin composition is molded into a molded body, the resin composition or From the viewpoint of increasing the weather resistance of the molded product made from the above, and from the viewpoint of improving the balance between the appearance and mechanical properties of the molded product, the total amount of component (A), component (D) and component (E) is 100. It is 0.02-1 weight part with respect to a weight part, Preferably it is 0.05-0.5 weight part, More preferably, it is 0.1-0.3 weight part.

  The propylene resin composition of the present invention may contain a vinyl aromatic compound-containing rubber in order to further improve the balance of mechanical properties. Examples of the vinyl aromatic compound-containing rubber include a block copolymer composed of a vinyl aromatic compound polymer and a conjugated diene polymer, and a hydrogenated product of such a block copolymer. The hydrogenation rate of the double bond in the conjugated diene polymer part is preferably 80% by weight or more, more preferably 85% by weight or more (however, the double bond contained in the conjugated diene polymer part is The total amount is 100% by weight).

  The molecular weight distribution measured by the GPC method of the vinyl aromatic compound-containing rubber is preferably 2.5 or less, more preferably 1 to 2.3.

  The content of the vinyl aromatic compound contained in the above-mentioned vinyl aromatic compound-containing rubber is preferably 10 to 20% by weight, more preferably 12 to 19% by weight (however, the vinyl aromatic compound-containing rubber) Of 100% by weight).

  The MFR measured at a temperature of 230 ° C. and a load of 2.16 kgf in accordance with JIS K 7210 of the above-mentioned vinyl aromatic compound-containing rubber is preferably 0.01 to 15 g / 10 min, more preferably 0.03 to 13 g / 10 minutes.

  Examples of the vinyl aromatic compound-containing rubber include styrene-ethylene-butene-styrene rubber (SEBS), styrene-ethylene-propylene-styrene rubber (SEPS), styrene-butadiene rubber (SBR), and styrene- Examples thereof include block copolymers such as butadiene-styrene rubber (SBS) and styrene-isoprene-styrene rubber (SIS), and block copolymers obtained by hydrogenating these block copolymers. Furthermore, the rubber | gum obtained by making vinyl aromatic compounds, such as styrene, react with ethylene-propylene-nonconjugated diene type rubber (EPDM) is also mentioned. Two or more kinds of vinyl aromatic compound-containing rubbers may be used in combination.

  Examples of the method for producing the above-mentioned vinyl aromatic compound-containing rubber include a method in which a vinyl aromatic compound is bonded to an olefin copolymer rubber or a conjugated diene rubber by polymerization or reaction.

  The polypropylene resin composition of the present invention may contain additives as necessary. Examples of additives include neutralizers, antioxidants, processing stabilizers, UV absorbers, nucleating agents, nucleating agents, lubricants, processing aids, metal soaps, colorants (carbon black, titanium oxide, etc.) Pigments), foaming agents, antibacterial agents, plasticizers, flame retardants, crosslinking agents, crosslinking aids, brightening agents, and the like.

  Examples of the antioxidant include a phenol-based antioxidant, a phosphorus-based antioxidant, a sulfur-based antioxidant, and a hydroxylamine-based antioxidant. Preferably, a phenolic antioxidant is used.

  As the phenolic antioxidant, a phenolic antioxidant having a molecular weight of 300 or more is preferably used. For example, tetrakis [methylene-3 (3 ′, 5′di-t-butyl-4-hydroxyphenyl) propionate] methane, octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, 3,9-bis [2- {3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy} -1,1-dimethylethyl] -2,4,8,10-tetraoxaspiro [5.5] undecane, triethylene glycol-N-bis-3- (3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate, 1,6-hexanediol bis [3- (3,5- Di-t-butyl-4-hydroxyphenyl) propionate], 2,2-thiobis-diethylenebis [3- (3,5-di-t-butyl-4-hydroxyl) Nyl) propionate], 1,3,5-tris 2 [3 (3,5-di-t-butyl-4-hydroxyphenyl) propionyloxy] ethyl isocyanate, 1,3,5-trimethyl-2,4,6 -Tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene, tris (3,5-di-t-butyl-4-hydroxybenzyl) isocyanurate, 1,3,5-tris (4- t-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanurate and the like.

    From the viewpoint of obtaining a polypropylene resin composition having excellent hue stability and a molded article comprising the same, 3,9-bis [2- {3- (3-tert-butyl-4-hydroxy] is preferably used as the phenolic antioxidant. -5-methylphenyl) propionyloxy} -1,1-dimethylethyl] -2,4,8,10-tetraoxaspiro [5.5] undecane, tris (3,5-di-t-butyl-4- Hydroxybenzyl) isocyanurate is used.

  The content of the phenolic antioxidant is 100 in total of the propylene polymerized material (component (A)), the ethylene-α-olefin copolymer (component (D)), and the inorganic filler (component (E)). It is preferable that it is 0.01-1 weight part with respect to a weight part.

  In addition, when a fatty acid metal salt is contained in the polypropylene resin composition of the present invention for the purpose of improving processability or improving dispersibility of a color pigment (pigment such as carbon black or titanium oxide), mold contamination is not caused. From the viewpoint of suppression, the content of the propylene polymer material (component (A)), the ethylene-α-olefin copolymer (component (D)), and the inorganic filler (component (E)) is preferable. It is 0.01-0.5 weight part with respect to a total of 100 weight part, More preferably, it is 0.01-0.2 weight part. Examples of the fatty acid metal salt include calcium stearate, magnesium stearate, zinc stearate and the like.

  Moreover, in order to improve the moldability, it is preferable to include a fatty acid amide selected from fatty acid monoamide and fatty acid bisamide in the propylene resin composition of the present invention. Applicable fatty acid amides include lauric acid amide, stearic acid amide, oleic amide, behenic acid amide, erucic acid amide, methylene bisstearyl amide, ethylene bisstearyl amide, ethylene bisoleyl amide, hexamethylene bisstearyl amide, etc. Is mentioned. The blending amount of the fatty acid amide is 100 in total of the propylene polymerized material (component (A)), the copolymer (component (D)) composed of ethylene and α-olefin, and the inorganic filler (component (E)). Preferably it is 0.01-0.2 weight part with respect to a weight part, More preferably, it is 0.01-0.1 weight part.

  Examples of the method for producing the propylene resin composition of the present invention include a method of melt-kneading each component. Examples of the melt-kneading method include a method using a kneader such as a single-screw extruder, a twin-screw extruder, a Banbury mixer, and a hot roll. As twin screw extruders, twin-screw co-rotating extruders (ZSK [registered trademark] manufactured by Coperion, TEM [registered trademark] manufactured by Toshiba Machine Co., Ltd.), TEX [registered trademark] manufactured by Nippon Steel Works, Ltd., Technobel Twin screw kneader, etc.), biaxial counter-rotating extruder (CMP [registered trademark], TEX [registered trademark] manufactured by Nippon Steel Works, Ltd., FCM [registered trademark] manufactured by Kobe Steel, Ltd.) , NCM [registered trademark], LCM [registered trademark], etc.). The melt kneading temperature is preferably 170 to 250 ° C., and the melt kneading time is preferably 1 to 20 minutes. Moreover, the melt kneading of each component may be performed simultaneously or sequentially.

As a method of efficiently blending a hindered amine light stabilizer (component (C)) in the production of the propylene resin composition of the present invention,
Prepare the following high-concentration granules of a hindered amine light stabilizer (component (C)) in which the concentration of the hindered amine light stabilizer (component (C)) is 10 to 90% by weight,
A method of blending the high-concentration granules into the propylene polymerized material (component (A)) used in the present invention, or
Melting and kneading the high-concentration granules with a propylene polymerized material (component (A)) used in the present invention, an ethylene-α-olefin copolymer (component (D)), and an inorganic filler (component (E)) The method of mix | blending with a thing is mentioned.

As the above high concentration granule,
A high-concentration granule that is a master batch obtained by melting and kneading a propylene polymerized material (component (A)) and a hindered amine light stabilizer (component (C)) used in the present invention into a granular form, or
Hindered amine light stabilizer (component (C)) and one or more other additives are uniformly mixed and granulated into a high-concentration granule, or
A high-concentration granule in which a hindered amine light stabilizer (component (C)), one or more other additives and the propylene polymerized material (component (A)) used in the present invention are uniformly mixed and solidified into granules; Is mentioned.

[Molded body]
The molded article of the present invention is a molded article made of the polypropylene resin composition of the present invention. Examples of the molded body of the present invention include an injection molded body, a press molded body, a vacuum molded body, a vacuum press molded body, a compressed air molded body, a foam molded body, and an extruded molded body.
Examples of the molding method for the polypropylene resin composition of the present invention include injection molding methods, press molding methods, vacuum molding methods, vacuum press molding methods, pressure molding methods, foam molding methods, extrusion molding methods, and the like. It is done.

  The molded article of the present invention is preferably an injection molded article. Examples of the injection molding method include a general injection molding method, an injection foam molding method, a supercritical injection foam molding method, an ultrahigh speed injection molding method, an injection compression molding method, an injection press molding method, and a gas assist injection molding method. , Sandwich molding method, sandwich foam molding method, insert / outsert molding method and the like.

Applications of the molded body of the present invention are preferably automotive parts, such as interior parts such as door rims, pillars, instrumental panels, consoles, rocker panels, armrests, door panels, spare tire covers, and bumpers, Examples include exterior parts such as spoilers, fenders, and side steps.
More preferred applications include low formaldehyde and acetaldehyde emissions, high antistatic properties, and low adhesion of dust and dust. Automobile interior parts such as spare tire covers.

The evaluation methods in the examples are as follows.
(1) Manufacture of molded body [Manufacture of injection molded body]
SE130DU (clamping force 130 tons) manufactured by Sumitomo Heavy Industries, Ltd. as an injection molding machine, and an injection mold (single point gate) having a cavity of 90 mm × 150 mm × 3.0 mm in size as a mold The resin composition was molded at a cylinder temperature of 220 ° C. and a mold temperature of 50 ° C. to obtain a flat plate molded body.
(2) Antistatic property Using the flat molded body produced by the method of (1) above, the surface specific resistance value (unit: Ω) is measured according to the method defined in JIS K 6911 after 14 days from molding. did. For measurement, a digital insulation meter DSM-8103 (electrode: SME-8310) manufactured by Toa DKK was used. When the surface resistivity is 1 × 10 ¹³ Ω or less, it is judged that the antistatic property is excellent (indicated by a symbol ○), and when it exceeds 1 × 10 ¹⁴ Ω, the antistatic property is not sufficient (the symbol × Display).

(3) Emission amount of formaldehyde and acetaldehyde It was measured by the following method.
(3-1) A test piece of 80 mm × 100 mm was cut out from the flat molded body produced by the method of (1) above, and the test piece was sealed in a Tedlar bag having a volume of 10 L and filled with pure nitrogen gas. Thereafter, the operation of substituting the gas in the Tedlar bag with nitrogen gas by removing pure nitrogen gas was repeated twice.
(3-2) A Tedlar bag was filled with 4 L of pure nitrogen gas, and the cock of the Tedlar bag was closed. The Tedlar bag was placed in an oven, a Teflon (registered trademark) tube for sampling was attached to the tip of the cock and extended to the outside of the oven, and in this state, heat treatment was performed at 65 ° C. for 2 hours.
(3-3) 3 L of the sample gas prepared in the above (3-2) was sampled in a 2,4-dinitrophenhydrazine (2,4-Dinitrophenylhydrazine (abbreviation: DNPH)) cartridge while being heated at 65 ° C. . The cartridge after collection was subjected to elution treatment with acetonitrile, and the obtained eluate was subjected to measurement of components eluted from the cartridge using a high performance liquid chromatograph (HPLC; manufactured by Waters, model: Ultra Performance Liquid Chromatography Aquiy). .
(3-4) From the above HPLC measurement results, the respective emission amounts of formaldehyde and acetaldehyde (the respective amounts of formaldehyde and acetaldehyde emitted from one test piece of a predetermined size, unit: μg / test piece), It calculated using the calibration curve of the standard substance of the said substance.

The materials used in Examples and Comparative Examples are as follows.
[Propylene polymerized material (component (A))]
Propylene- (propylene-ethylene) polymerized material (A-1)
The polymer material (A-1) is a propylene monopolymer having the following properties produced by a liquid phase-gas phase polymerization method using a polymerization catalyst obtained by the method described in Example 1 of JP-A No. 2004-182981. It was a propylene polymerized material composed of a coalescing component (I) and a propylene-ethylene copolymer component (II). The physical properties of the polymerization material (A-1) were as follows.
MFR (230 ° C., 2.16 kgf load): 61 g / 10 min Content of structural unit derived from ethylene: 4.2 wt%
Intrinsic viscosity ([η] _total ): 1.56 dl / g
Propylene homopolymer component (I)
Intrinsic viscosity of propylene homopolymer component ([η] _I ): 0.89 dl / g
Propylene-ethylene copolymer component (II)
Content of propylene-ethylene copolymer component: 13.3% by weight
Content of structural unit derived from ethylene contained in propylene-ethylene copolymer component: 31.6% by weight
Intrinsic viscosity of propylene-ethylene copolymer component ([η] _II ): 5.9 dl / g

[Antistatic agent (component (B))]
The antistatic agent of B-1, B-2, and B-3 shown below is mixed as appropriate, and the blending ratio and blending amount of the ester compound (component (i)) and alkyldiethanolamine (component (ii)) are adjusted, Used as an antistatic agent (component (B)).
Antistatic agent (B-1)
Product name: SP151 (manufactured by Toho Chemical Industry Co., Ltd.)
Ingredients: 50 parts by weight of diglycerol monostearate, 45 parts by weight of glycerol monostearate, 5 parts by weight of stearyl diethanolamine (B-2)
Product name: SA20 (manufactured by Toho Chemical Industry Co., Ltd.)
Ingredient: Stearyl diethanolamine 100 parts by weight antistatic agent (B-3)
Product name: TS2B (manufactured by Kao Corporation)
Ingredients: 50 parts by weight of stearyl diethanolamine, 50 parts by weight of stearyl alcohol

式（ＩＩＩ）
ｐＫａ：７．０
ＴＧ−ＤＴＡによる重量減少率：２．２重量％ [Light stabilizer (component (C))]
Hindered amine light stabilizer (C-1)
Product name: UVINUL 5050H (manufactured by BASF Japan Ltd.)
Sterically hindered amine oligomer “copolymer comprising N- (2,2,6,6-tetramethyl-4-piperidyl) maleic imide and α-olefin (C20-24)”
Structural formula:

Formula (III)
pKa: 7.0
Weight reduction by TG-DTA: 2.2% by weight

[Ethylene-α-olefin copolymer (component (D))]
Ethylene-butene-1 random copolymer (D-1)
Product name: (registered trademark) Excellen FX CX5505 (manufactured by Sumitomo Chemical Co., Ltd.))
Density: 0.870 g / cm ³
MFR (230 ° C., 2.16 kg load): 27.6 g / 10 min

[Inorganic filler (component (E))]
Talc (E-1)
Product name: (registered trademark) JR-63 (manufactured by Kamitaruku Co., Ltd.)
Average particle diameter (50% equivalent particle diameter D50): 1.8 μm
[Other ingredients]
Calcium stearate (F-1)
Product name: Calcium stearate G series (Shinagawa Chemical Co., Ltd.)
Antioxidant (G-1)
Compound name: 3,9-bis [2- {3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy} -1,1-dimethylethyl] -2,4,8,10- Tetraoxaspiro [5.5] undecane Product name: (registered trademark) Sumilizer GA80 (manufactured by Sumitomo Chemical)
Antioxidant (G-2)
Compound name: Bis (2,4-di-t-butylphenyl) pentaerythritol diphosphite Product name: (registered trademark) Songnox S6260 (manufactured by Matsubara Sangyo)
Antioxidant (G-3) Compound name: Dimyristyl-3,3′-thiodipropionate Product name: (registered trademark) Sumilizer TPM (manufactured by Sumitomo Chemical)
Aliphatic amide compound (H-1)
Compound name: Ethylene bisstearyl amide organic peroxide masterbatch (I-1)
1,3-bis (t-butylperoxyisopropyl) benzene 8% by mass,
88% by mass of a propylene homopolymer,
Masterbatch consisting of 4% by mass of SiO ₂ Product name: Parka Dox 14 (manufactured by Kayaku Akzo Corporation)

[Example 1]
82 parts by weight of the propylene- (propylene-ethylene) block copolymer (A-1), 7 parts by weight of the ethylene-butene-1 random copolymer (D-1), and 11 parts by weight of talc (E-1) The antistatic agent (B-1) is 0.60 part by weight with respect to 100 parts by weight of the total amount of (A-1), (D-1) and (E-1). , 0.15 parts by weight of hindered amine light stabilizer (C-1), 0.05 parts by weight of antioxidant (G-2), 0.03 parts by weight of antioxidant (G-3), aliphatic 0.04 parts by weight of the amide compound (H-1) and 0.25% by weight of the organic peroxide master batch (I-1) were blended and uniformly premixed with a tumbler.
The obtained mixture was melt-kneaded using a twin-screw extruder ((registered trademark) TEX44αII: manufactured by Nippon Steel Co., Ltd., barrel inner diameter: 44 mmφ, screw rotation speed: 200 rpm, cylinder temperature: 200 ° C.), and obtained. A woven wire mesh filter (50 mesh, opening: 410 μm) and a sintered filter ((registered trademark): Naslon filter NF15N: manufactured by Nippon Seisen Co., Ltd.) set the melt-kneaded product at the die entrance of the twin-screw extruder. ) And then extruded from the die part. The extrudate was cooled and solidified with cold water and cut to obtain pellets. The extrusion speed at this time was 50 kg / hour.

[Example 2]
The same procedure as described in Example 1 was performed except that the blending amount of the antistatic agent (B-1) was 0.40 parts by weight and the antistatic agent (B-2) was 0.05 parts by weight. It was.

[Example 3]
Except for blending the antistatic agent (B-1) in an amount of 0.40 parts by weight and antistatic agent (B-2) SA20 in an amount of 0.10 parts by weight, the same method as described in Example-1 went.

[Comparative Example 1]
The method described in Example 1 except that the blending amount of the antistatic agent (B-1) was 0.40 part by weight and 0.20 part by weight of the antistatic agent (B-3) TS-2B was blended. The same was done.

[Comparative Example 2]
The method described in Example 1 except that the blending amount of the antistatic agent (B-1) is 0.30 part by weight and 0.01 part by weight of the antistatic agent (B-3) TS-2B is blended. The same was done.

[Evaluation of resin composition]
The resin compositions obtained in the above-mentioned Examples and Comparative Examples were injection molded by the above method, and the obtained test pieces were evaluated for the amount of formaldehyde and acetaldehyde emitted and the antistatic property by using the above method. It was.

  In Table 1, the blending ratio and blending amount of the components (i) and (ii) of the antistatic agent (component (B)) blended in Examples 1 to 3 and Comparative Examples 1 and 2, the light stabilizer (component ( The evaluation results of the type and blending amount of D)) and the amount of antistatic formaldehyde and acetaldehyde emitted from the injection molded product of the polypropylene resin composition obtained by granulation were shown.

Claims (3)

100 to 50 parts by weight of a propylene polymerized material (component (A)),
0-25 parts by weight of an ethylene-α-olefin copolymer (component (D)),
Containing 0 to 25 parts by weight of inorganic filler (component (E)) (the total amount of component (A), component (D) and component (E) is 100 parts by weight),
With respect to 100 parts by weight of the total amount of component (A), component (D), and component (E),
0.45 to 0.7 parts by weight of the following antistatic agent (component (B)),
A polypropylene resin composition having 0.02 to 1 part by weight of the following hindered amine light stabilizer (component (C)).
Antistatic agent (component (B)):
At least one ester compound (component (i)) selected from the group consisting of monoglycerin fatty acid esters and diglycerin fatty acid esters;
Consisting of alkyl diethanolamine (component (ii)),
The antistatic agent whose weight ratio (component (i) / component (ii)) of component (i) and component (ii) is 1 / 0.01-1 / 0.32.
Hindered amine light stabilizer (component (C)):
Having 2,2,6,6-tetramethylpiperidyl group,
The acid dissociation constant (pKa) is less than 8,
A hindered amine light stabilizer having a weight reduction rate of less than 10% by weight measured by thermogravimetric analysis at a temperature of 300 ° C. and a nitrogen gas atmosphere (the total weight of the hindered amine light stabilizer is 100% by weight).   Component (i) of the antistatic agent (component (B)) is selected from the group consisting of monoglycerol stearate, monoglycerol palmitate, diglycerol stearate and diglycerol palmitate The polypropylene resin composition according to claim 1, which is a mixture of at least two ester compounds, and component (ii) is stearyl diethanolamine.   The molded object which consists of a polypropylene resin composition of Claim 1 or 2.