JPH0655870B2 - Propylene polymer composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to a propylene polymer composition, and more specifically, a propylene polymer having certain properties is blended with a specific organic phosphorus compound and an antistatic agent. The present invention relates to a propylene polymer composition having excellent rigidity, heat resistance, surface impact resistance and antistatic property.

[Problems to be Solved by Prior Art and Invention]

Generally, polypropylene has good heat resistance, chemical resistance, rigidity, impact resistance, moldability, etc., and is widely used as a material for film molding, sheet molding, blow molding, injection molding and the like.

However, although this polypropylene generally has excellent physical properties as described above, these properties are not sufficiently satisfied depending on the application. In particular, if the rigidity and surface impact resistance are further improved, the thickness of the molded product can be reduced accordingly, the productivity is improved, and the weight of the product is reduced.

Therefore, it has been attempted to develop polypropylene having high crystallinity for the purpose of improving the rigidity and surface impact resistance of polypropylene (Japanese Patent Application Laid-Open No. 55-81125).
JP-A No. 59-22313 and JP-A No. 59-22313) have not yet been obtained with sufficient rigidity and surface impact resistance.

Further, the propylene-based polymer has a drawback that the surface of a molded article is easily soiled due to being easily charged due to the non-polarity of the propylene-based polymer, and therefore, it is limited in applications requiring antistatic properties. There is a problem.

However, a propylene-based polymer mixed with various nucleating agents and antistatic agents is improved in antistatic property, but for example, with a sulfonic acid metal salt proposed in JP-A-49-103941. In the case of a composition containing a nonionic surfactant in combination, the effects of improving the transparency, rigidity and heat resistance of the composition are not yet sufficiently satisfactory. Further, a composition proposed in JP-A-58-157840, which uses a dibenzylidene sorbitol (DBS) compound in combination with an antistatic agent, has a marked transparency of a molded product immediately after molding of the composition. Although improved, the DBS compound seeps out over the surface of the molded product with the passage of time, which causes problems such as a marked decrease in transparency and appearance and inhibition of the antistatic effect of the antistatic agent. Moreover, the effect of improving the rigidity and heat resistance of the composition is not yet sufficiently satisfactory.

The applicant has already developed a composition comprising polypropylene and an organic phosphorus compound (Japanese Patent Laid-Open No. 63-243150).
JP-A-63-243152), there is still room for improvement in surface impact resistance, rigidity, antistatic properties, and the like.

The present inventors have conducted intensive studies to solve the above-mentioned problems of the prior art and to develop a polypropylene composition having improved rigidity, heat resistance, surface impact resistance, antistatic property, and the like.

[Means for Solving the Problems]

As a result, surprisingly, it was found that the above problems can be solved by reducing the coarse particles of a specific organophosphorus compound compounded to polypropylene to a certain amount or less and by compounding an antistatic agent, and the present invention It came to completion.

That is, in the present invention, (A) the intrinsic viscosity [η] _PP is 0.8 to
Propylene homopolymer having an isotactic pentad fraction [I] of 4 dl / g and satisfying the formula [I] ≥ -1.02 [η] _PP +96.0 (unit:%) or the homopolymer of the homopolymer With respect to 100 parts by weight of the mixture of the polymer and the propylene-ethylene copolymer, (B) a general formula as a nucleating agent (In the formula, R ¹ represents a hydrogen atom or an alkyl group having 1 to 18 carbon atoms, R ² represents an alkyl group having 1 to 18 carbon atoms, Alternatively, it represents M _{1 / a} . In addition, M is Na, K, Mg, C
represents a or Al, and a represents the valence of M. ) An organophosphorus compound and / or a general formula (In the formula, R represents a methylene group, an ethylidene group, a propylidene group or an isopropylidene group, and R ³ and R ⁴ each represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. 0.005 to 1.0 part by weight of an organophosphorus compound represented by the formula (1) is added, and particles having a maximum size of 50 μm or more of the organophosphorus compound are mixed in an amount of 15 per 1 mg of the composition obtained.
0 or less and 0.01 to (C) antistatic agent
A propylene polymer composition containing 5 parts by weight is provided.

The propylene homopolymer, which is the component (A) of the composition of the present invention, is usually produced in the presence of a stereoregular catalyst. Not only propylene homopolymers consisting of 100% propylene units but also other heavy polymers are used. may be a substantial propylene homopolymer containing 2% by weight of ethylene units or C ₄ or more olefin unit during coalescence, propylene homopolymer described in particular Sho 63-243150 Patent Publication preferable. Further, it is composed of a mixture of a propylene homopolymer component and a propylene-ethylene copolymer component as the component (A), and is referred to as a so-called propylene block copolymer (strictly, only a small number of block copolymers are formed). The propylene polymer described in JP-A-63-243152 is particularly preferable as this type.

The propylene homopolymer having the above-mentioned properties can be produced by various methods. Among them, as a suitable method, for example, by applying a known slurry polymerization method, solution polymerization method, liquid phase polymerization method using an olefin monomer as a medium, or gas phase polymerization method in the presence of a stereoregular catalyst. You can

The stereoregular catalyst used here is a catalyst generally used for stereoregular polymerization of ethylene, propylene, etc., and usually a mixture of at least a transition metal halogen compound component and an organoaluminum compound component is used. To be

As the transition metal halogen compound, a halide of titanium is preferable, and examples thereof include titanium trichloride and titanium tetrachloride, and titanium trichloride is particularly preferable. Titanium trichloride is obtained by reducing titanium tetrachloride by various methods;
These further ball mill treatment and / or solvent washing those activated by (eg washing with an inert solvent and / or polar compounds containing inert solvent); titanium trichloride or titanium trichloride eutectic (e.g. TiCl ₃ · 1 / 3
AlCl ₃ ) further co-milled with amine, ether, ester, sulfur, halogen derivative, organic or inorganic nitrogen or phosphorus compound, etc .; obtained by precipitating titanium trichloride liquefied in the presence of ether compound Examples thereof include those obtained by the method described in JP-B-53-3356. Alternatively, a titanium halide supported on a magnesium compound may be used.

As the organoaluminum compound represented by the general formula AlR _n X _3-n (In the formula, R represents an alkyl group, an alkoxy group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms having 1 to 10 carbon atoms , X represents a halogen atom, and n is 0 <n ≦ 3.
Indicates the value of. The compound represented by the formula () is suitable.

Examples of such substances include triethylaluminum, triisobutylaluminum, tri-n-propylaluminum, diethylaluminum monochloride,
Examples include diethylaluminum monobromide, diethylaluminum monoiodide, diethylaluminum monoethoxide, diisobutylaluminum monoisobutoxide, diethylaluminum monohydride, diisobutylaluminum monohydride, ethylaluminum sesquichloride, and one or two of these. The above can be used. The atomic ratio of Al / Mt (Mt represents a transition metal such as Ti) in the mixture of these catalysts is 0.1 to 1000, preferably 1 to 1000.
It is about 100. Further, as the third component of the catalyst, for example, an electron donating compound such as alcohol, aldehyde, ether, ester, lactone, ketone, amine, amide, organophosphorus compound, organosilicon compound, thiol, thioether, thioester can be used. it can.

The intrinsic viscosity [η] _PP of the propylene homopolymer can be efficiently controlled by adding an appropriate amount of a molecular weight modifier such as hydrogen to the polymerization reaction system. Further, the isotactic pentad fraction [I] and the density [d] can be controlled by appropriately selecting the type of catalyst or cocatalyst, polymerization conditions such as temperature and the like. Further, this propylene homopolymer has a density [d] of the formula [d] ≧ −0.00563 [η] _PP + 0.885 (unit: g / cm ³ ) in relation to the intrinsic viscosity [η] _PP. Particularly, those satisfying [d] ≧ −0.00563 [η] _PP + 0.890 (unit: g / cm ³ ) are desirable.

In addition, when the component (A) is a block copolymer (mixture) of the propylene homopolymer and the propylene-ethylene copolymer as described above, various methods are available for producing the block copolymer. However, in general, it is efficiently produced by a multistage polymerization method, particularly a two-stage polymerization method. The two-stage polymerization method can be carried out under various conditions, but usually, the stereoregular catalyst as described above is used. It is possible to proceed by carrying out the polymerization reaction in the presence of.

Such stereoregular catalysts are used in each stage of the polymerization reaction in the amounts and embodiments normally used.

The polymerization conditions in each stage are as follows: temperature is usually 0 to 100 ° C., preferably 30 to 90 ° C., pressure is usually 0.01 to 45 kg / cm ² ,
Preferably, it may be about 0.05 to 40 kg / cm ² .
As the method of polymerization, known methods can be applied, and examples thereof include slurry polymerization, solution polymerization, gas phase polymerization, liquid phase polymerization using an olefin monomer as a medium, and the like.

When a solvent is used in the polymerization, normally, an aliphatic, alicyclic or aromatic inert hydrocarbon can be preferably used as the solvent, and specifically, for example, pentane, hexane, heptane, cyclohexane. , Benzene, toluene and so on.

As a specific operation of the two-step polymerization method, for example, first, as a first step, an appropriate solvent and a stereoregular catalyst are added to the reaction system,
Propylene was introduced under predetermined polymerization conditions to proceed the polymerization reaction to obtain a propylene homopolymer having the desired properties, and then unreacted propylene monomer was removed if necessary, and then propylene produced as the second step In the above reaction system where a homopolymer is present, propylene and ethylene are introduced under predetermined polymerization conditions and copolymerized to obtain a propylene-ethylene copolymer, and as a mixture of this and the propylene homopolymer. The component (A) of the present invention can be obtained.

When a block copolymer composed of a mixture of (a ₁ ) propylene homopolymer component and (a ₂ ) propylene-ethylene copolymer component is used as the component (A), the mixing ratio is not particularly limited. However, (a ₁ ) propylene homopolymer component 55 to 97% by weight, preferably 60 to 90% by weight, (a ₂ ) propylene-ethylene copolymer component 45 to 3
%, Preferably 40 to 10% by weight.

The propylene homopolymer in the component (A) of the composition of the present invention has the intrinsic viscosity [η] _PP and the isotactic pentad fraction [I] as described above.

Here, the intrinsic viscosity [η] _PP is a value measured in tetralin heated to 135 ° C. The intrinsic viscosity [η] _PP of the propylene homopolymer is 0.8 to 4 dl / g as described above, but preferably 1.0 to 3.0 dl / g. When the intrinsic viscosity [η] _PP is less than 0.8 dl / g, a composition satisfying impact resistance cannot be obtained, while when it is more than 4 dl / g, a composition having excellent moldability is obtained. I can't.

The isotactic pentad fraction [I] of this propylene homopolymer has an intrinsic viscosity [η] as described above.
[I] ≧ between _PP -1.02 [η] _{PP +96.0} (unit:%) of satisfying the relational expression, particularly preferably [I] ≧ -1.02 [η] _PP Tasu96.5 It is necessary to satisfy the relational expression of (unit:%).

If the isotactic pentad fraction [I] does not satisfy the above relational expression, the resulting composition will not have sufficient rigidity, heat resistance and hardness.

Here, the isotactic pentad fraction [I] is
A. Zambelli et al. Macromolecules, 6,925
(1973) is an isotactic fraction in pentad units in a polypropylene molecular chain measured using a nuclear magnetic resonance spectrum ( ¹³ C-NMR) with isotopic carbon according to the method disclosed in (1973). In other words, the isotactic pentad fraction is 5 propylene monomer units.
It is the fraction of propylene monomer units that are meso-bonded in succession. However, the attribution of peaks was based on the corrected version of the above-mentioned document described in Macromolecules, 8, 687 (1975). Specifically, ¹³ C-NM
Mmm in the total absorption peak in the methyl carbon region of the R spectrum
Isotactic pentad units are measured with the intensity fraction of the m peak.

On the other hand, when the component (A) of the composition of the present invention is a mixture of the propylene homopolymer and the propylene-ethylene copolymer as described above, the physical properties of the propylene-ethylene copolymer are not particularly limited. It may be appropriately selected depending on the situation, but in general, the intrinsic viscosity [η] _PE is 2 to
7 dl / g, preferably 2.2 / 6.0 dl / g, and having an ethylene unit content of 20 to 70% by weight, preferably 2
5 to 65% by weight. Where the intrinsic viscosity [η]
_{If PE} is less than 2 dl / g, impact resistance of the resulting composition may be insufficient, and if it exceeds 7 dl / g, moldability and rigidity may be insufficient. Furthermore, when the ethylene unit content of the propylene-ethynelene copolymer is outside the range of 20 to 70% by weight, the impact resistance of the resulting composition may decrease.

The value of the intrinsic viscosity [η] _{PE is} a value measured in tetralin heated to 135 ° C. Here, the intrinsic viscosity [η] _PE of the (a ₂ ) propylene-ethylene copolymer is
It is not a value measured by taking out only the component (a ₂ ) from the polymer which is the component (A) which is a mixture of the component (a ₁ ) and the component (a ₂ ), and it is calculated by the following calculation procedure. It is a concept.

First, the intrinsic viscosity [η] _PP of the (a ₁ ) propylene homopolymer polymerized in the first step of the production process of the polymer as the component (A) is measured, and then the first and second step polymerizations are carried out. Intrinsic viscosity [η] _{C of} polymer (A) obtained as a result
To measure. At this time, propylene which is the component (a ₂ )
[Η] _PE , [η], where x is the ratio of ethylene copolymer
Assuming that the following equation holds between _PP and [η] _C , the intrinsic viscosity [η] _PE of the (a ₂ ) propylene-ethylene copolymer can be calculated by the equation.

[Η] _C = x [η] _PE + (1-x) [η] _PP ...... [η] _PE = 1 / x · [η] _C- (1 / x-1) [η] _PP ......
The (a _a) a propylene - Control of intrinsic viscosity [η] _PE ethylene copolymer also, (a ₁₎ Similar to the intrinsic viscosity [η] _PP of the propylene homopolymer, the polymerization the molecular weight modifier such as hydrogen It can be performed by adding to the reaction system.

In the composition of the present invention, the propylene homopolymer as described above or a polymer comprising a mixture of a propylene homopolymer and a propylene-ethylene copolymer is used as the component (A),
A specific organophosphorus compound as a nucleating agent is added to this as a component (B). Here, as the organic phosphorus compound, the above-mentioned organic phosphorus compound represented by the general formula [BI] and / or the organic phosphorus compound represented by the general formula [B-II] is used. One kind or two or more kinds can be mixed. Regarding the blending ratio of the component (B), that is, the organophosphorus compound, the component (B) is usually added to 100 parts by weight of the polymer as the component (A).
It may be set in the range of 005 to 1.0 part by weight, preferably 0.01 to 0.7 part by weight. Here, if the blending amount of the component (B) is less than 0.005 parts by weight, the rigidity and heat resistance of the obtained composition are insufficient, and even if it exceeds 1.0 parts by weight, the blending amount corresponds to The improvement of the effect of is not recognized. The organophosphorus compound represented by the general formula [BI] includes various compounds depending on the types of R ¹ , R ² and M in the formula. R ¹ in the formula represents a hydrogen atom or an alkyl group having 1 to 18 carbon atoms as described above. Here, as the alkyl group having 1 to 18 carbon atoms, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group,
2nd butyl group, 3rd butyl group, n-amyl group, 3rd amyl group, hexyl group, heptyl group, n-octyl group, 2-
Examples thereof include ethylhexyl group, third octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group and octadecyl group.

R ² is an alkyl group having 1 to 18 carbon atoms (specifically the same as the above R ¹ ) or (That is, an aryl group having 7 to 24 carbon atoms) or M _{1 / a} . Further, M is Na, K, Mg, Ca or Al,
a represents the atomic value of M.

Specific examples of the organic phosphorus compound represented by the general formula [BI] are shown below by chemical formulas.

On the other hand, there are various organophosphorus compounds (b ₂ ) represented by the general formula [B-II] depending on the kinds of R, R ³ , R ⁴ and M in the formula. R ³ and R ⁴ each represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms,
As the alkyl group, a methyl group, an ethyl group, an isopropyl group, an n-butyl group, an isobutyl group, a secondary butyl group,
Examples thereof include tertiary butyl group, n-amyl group, tertiary amyl group and hexyl group.

Specific examples of the organic phosphorus compound represented by the general formula [B-II] are shown below by chemical formulas.

In the composition of the present invention, the maximum dimension is 5 in 1 mg of the composition.
The number of particles of the organophosphorus compound having a size of 0 μm or more is 150 or less, preferably 100 or less, particularly preferably 50 or less. When 1 mg of the composition contains more than 150 particles of an organophosphorus compound having a maximum size of 50 μm or more,
There is a problem that the improvement in rigidity is small and conversely the surface impact resistance is significantly reduced. The average particle size of the organophosphorus compound in the composition is preferably 50 μm or less, more preferably 30 μm or less. When the average particle diameter exceeds 50 μm, the rigidity is not improved so much and the surface impact resistance may be deteriorated.

In the composition of the present invention, an antistatic agent is blended as the component (C) together with the components (A) and (B). Here, the antistatic agent is not particularly limited, and known ones can be used, but an antistatic agent composed of a nonionic surfactant that is thermally stable during molding of the propylene-based polymer is preferable. Specific examples of the nonionic surfactant include glycerin monolaurate; glycerin monomyristyrate; glycerin monopalmitate; glycerin monostearate; glycerin monobehenate; glycerin fatty acid ester such as glycerin monooleate; diglycerin. Monolaurate; diglycerin monomyristyrate; diglycerin monopalmitate; diglycerin monostearate; diglycerin monobehenate; diglycerin fatty acid ester such as diglycerin monooleate, sorbitan fatty acid ester; propylene glycol fatty acid ester; Sugar fatty acid ester, citric acid mono (di or tri) stearyl ester; pentaerythritol fatty acid ester; trimethylolpropane fatty acid ester; polyoxyethylene Polyglycerin fatty acid ester; Polyoxyethylene sorbitan fatty acid ester; Polyethylene glycol fatty acid ester; Polypropylene glycol fatty acid ester; Polyoxyethylene aliphatic alcohol ether; Polyoxyethylene alkylphenyl ether; Polyoxypropylene-polyoxyethylene block polymer; Polyethylene glycol; Polypropylene Glycol, and further N, N-bis (2-hydroxyethyl) laurylamine; N, N-
Bis (2-hydroxyethyl) myristylamine; N,
N-bis (2-hydroxyethyl) palmitylamine;
N, N-bis (2-hydroxyethyl) stearylamine; N, N-bis (2-hydroxyethyl) aliphatic amines such as N, N-bis (2-hydroxyethyl) oleylamine, N, N-bis (2 -Hydroxyisopropyl) laurylamine; N, N-bis (2-hydroxyisopropyl) myristylamine; N, N-bis (2-hydroxyisopropyl) palmitylamine; N, N-bis (2-hydroxyisopropyl) stearylamine;
N, N-bis (2-hydroxyisopropyl) aliphatic amines such as N, N-bis (2-hydroxyisopropyl) oleylamine, N, N-bis (2-hydroxyethyl) laurylamide; N, N-bis (2 -Hydroxyethyl) myristylamide; N, N-bis (2-hydroxyethyl) palmitylamide; N, N-bis (2-hydroxyethyl) stearylamide; N, N-bis (2-
Hydroxyethyl) behenylamide; N, N-bis (2
-Hydroxyethyl) oleylamide and other N, N-bis (2-hydroxyethyl) fatty acid amides, N, N-bis (2-hydroxyisopropyl) laurylamide;
N, N-bis (2-hydroxyisopropyl) myristylamide; N, N-bis (2-hydroxyisopropyl) palmitylamide; N, N-bis (2-hydroxyisopropyl) stearylamide; N, N-bis (2 −
N, N such as (hydroxyisopropyl) oleylamide
Examples thereof include mono- or diesters of -bis (2-hydroxyisopropyl) fatty acid amide or the aforementioned N, N-bis (2-hydroxyethyl) fatty acid amine with fatty acids such as lauric acid and stearic acid. Particularly, glycerin fatty acid monoester, N, N-bis (2-hydroxyethyl) fatty acid amine or N, N-bis (2-hydroxyethyl) aliphatic amine fatty acid monoester is preferable. Other amide compounds represented by the following formula (However, m = an integer of 7 to 21, 2 ≦ p + q ≦ 4) can also be mentioned as a preferable example.

The composition of the present invention can be basically obtained by mixing the above-mentioned component (A) and the finely pulverized component (B) and component (C), but using a twin-screw kneader (B). It can also be produced by strongly kneading the component (A), the component (B) and the component C) until the particle diameter of the component becomes a predetermined value or less. Further, if desired, various additives which are usually added to appropriate amounts of polyolefin, for example, antioxidants such as phenol type, thioether and phosphorus type, light stabilizers, clarifying agents, nucleating agents, lubricants, antistatic agents and Clouding agents, anti-blocking agents, non-dripping agents, pigments, heavy metal deactivators (copper damage inhibitors), radical generators such as peroxides, dispersants or neutralizers for metal soaps, inorganic fillers ( For example, talc,
Mica, clay, wollastonite, zeolite, asbestos, calcium carbonate, aluminum hydroxide, magnesium hydroxide, barium sulfate, calcium silicate, glass fiber, carbon fiber, etc. or coupling agent (for example, silane-based, titanate-based, boron) The above-mentioned inorganic filler or courageous filler (for example, wood flour, pulp, waste paper, synthetic fiber, natural fiber, etc.) which has been surface-treated with a surface treating agent such as a base, an aluminate, a zircoaluminate, etc.) of the present invention. It can be used in combination as long as the purpose is not impaired.

〔Example〕

 Next, the present invention will be described in more detail with reference to examples.

Examples 1 to 6 Dehydrated n-hexane 5 was put into an autoclave equipped with a stirrer having an internal volume of 10, and 1.0 g of diethylaluminum chloride and 0.3 g of titanium trichloride were added.

In the first stage polymerization reaction, the liquidus temperature was maintained at 65 ° C., hydrogen was metered so that the produced polypropylene had a predetermined intrinsic viscosity, and propylene was continuously fed so that the reaction pressure was 9 kg / cm ^2. And was polymerized while stirring for 90 minutes. Then, unreacted propylene was removed to the outside of the reaction system, and the liquidus temperature was lowered to 57 ° C.

Next, in the second stage polymerization reaction, while maintaining the temperature at 57 ° C., a mixture of propylene and ethylene and measured hydrogen were supplied so as to obtain a predetermined intrinsic viscosity and ethylene unit content, and polymerization was performed for 60 minutes. I went. Then, the unreacted gas was removed, 50 ml of n-butanol was added to the polymerization product, and the catalyst was decomposed by stirring at 65 ° C. for an hour. After that,
A white powdery polymer was obtained through a separation process, a washing process and a drying process. The properties of the obtained polymer [(A) polymer] are shown in Table 1.

Subsequently, the (A) polymer, (B) an organic phosphorus compound having an average particle size of 2 μm, which has been ground beforehand, and (C) an antistatic agent are uniformly kneaded at 230 ° C. using a single-screw extruder to obtain a resin composition. Got

Next, the number of particles and the average particle diameter of the organic phosphorus compound of 50 μm or more in this resin composition were measured, and the results are shown in Table 1.

The number of coarse particles in the resin composition is measured by forming a film having a constant thickness (50 to 100 μm) and measuring the number of particles having a maximum dimension of 50 μm or more at room temperature or 180 ° C. using a polarizing microscope. The average value of the measurement points n = 40 is converted per 1 mg of the composition.

Further, the flexural modulus, falling weight impact strength, surface resistivity and appearance of this resin composition were measured. The results are shown in Table 2.

Examples 7 to 10 A dehydration-purified n-heptane 2 was placed in a stainless steel polymerization reactor having an internal volume of 5, and titanium trichloride and diethylaluminum chloride were further added to bring the reactor temperature to 65.
C., the gas phase was sufficiently replaced with propylene, and hydrogen was supplied. Then, while stirring, propylene was continuously fed so that the total pressure was kept constant at 9.0 kg / cm ² G, and polymerization was carried out at a temperature of 65 ° C. for 60 minutes. Propylene homopolymer having the properties shown in Table 1 [(A) polymer; JIS K 711
A density of 0.900 g / cm ³ ] measured according to No. 2 was obtained.

The polymer (A), (B) an organophosphorus compound having an average particle size of 2 μm, which has been ground beforehand, and (C) an antistatic agent are used in Examples 1 to 6
Kneading was carried out in the same manner as above to obtain a resin composition.

The results of measuring the number of particles having a maximum size of 50 μm or more in the composition and the average particle size of this resin composition in the same manner as in Examples 1 to 6 are shown in Table 1, and the flexural modulus and falling weight impact strength are shown. Table 2 shows the results of measurement of surface resistivity and appearance.

Examples 11 to 14 Examples 1 to 6 or Examples 7 to 10 except that an organophosphorus compound having an average particle size of 60 μm and a propylene polymer were strongly kneaded using a biaxial kneader to produce a resin composition. A resin composition was produced in the same manner as.

The results of measuring the number of particles having a maximum size of 50 μm or more in the composition and the average particle size of this resin composition in the same manner as in Examples 1 to 6 are shown in Table 1, and the flexural modulus and falling weight impact strength are shown. , Surface resistivity and appearance were measured. The results are shown in Table 2.

Example 15 Propylene polymer in the same manner as in Examples 1 to 6 in the presence of 0.05 parts by weight of 2,5-dimethyl-2,5-di (tert-butylperoxy) hexane as a radical generator. A composition was produced.

The results of measuring the number of particles having a maximum size of 50 μm or more in the composition and the average particle size of this resin composition in the same manner as in Examples 1 to 6 are shown in Table 1, and the flexural modulus, falling weight impact strength , Surface resistivity and appearance were measured. The results are shown in Table 2.

Comparative Examples 1 to 11 An organophosphorus compound having an average particle size of 60 μm or another nucleating agent and the polymer (A) having the properties shown in Table 3 were kneaded using a single screw extruder to give a resin composition. Manufactured.

The results of measuring the number of particles having a maximum dimension of 50 μm or more in the composition and the average particle size of this resin composition in the same manner as in Examples 1 to 6 are shown in Table 3, and the bending elastic modulus and the falling weight impact strength are shown. , Surface resistivity and appearance were measured. The results are shown in Table 4.

Comparative Examples 12 to 19 An organic phosphorus compound having an average particle size of 2 μm, which has been ground beforehand, (C) an antistatic agent and (A) a polymer having the properties shown in Table 3 are kneaded using a single-screw extruder, A resin composition was produced.

The results of measuring the number of particles having a maximum dimension of 50 μm or more in the composition and the average particle diameter of this resin composition in the same manner as in Examples 1 to 6 are shown in Table 3, and the bending elastic modulus and falling weight impact strength are shown. , Surface resistivity and appearance were measured. The results are shown in Table 4.

In addition, in the examples and comparative examples, the following substances were used as the organic phosphorus compounds.

formula Bis (4-t-butylphenyl) sodium phosphate represented by the formula (NA-10) Methylenebis (2,4-di-t-butylphenol) acid phosphate sodium (NA-1)
1).

[Effects of the Invention] As described above, the propylene polymer composition of the present invention is remarkably excellent in rigidity, surface impact resistance, and antistatic property while sufficiently maintaining the hardness, appearance, moldability, etc. originally possessed by propylene. It is a thing.

Therefore, by using the propylene polymer composition of the present invention, the rigidity of the molded article is improved, and thus it is possible to reduce the thickness,
It is advantageous in terms of resource saving and productivity.

Therefore, the propylene polymer composition of the present invention can be widely and effectively utilized as injection molding, film molding, sheet molding, blow molding material and the like.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display area C08K 5: 521 5: 527 (56) References JP-A-63-243152 (JP, A) Special features Kai 63-243150 (JP, A) JP 63-37148 (JP, A) JP 62-241942 (JP, A) JP 1-104639 (JP, A)

Claims (3)

[Claims] 1. An (A) intrinsic viscosity [η] _PP of 0.8 to 4 dl /
and a propylene homopolymer or an isotactic pentad fraction [I] thereof satisfying the formula [I] ≧ −1.02 [η] _PP +96.0 (unit:%) The general formula as the (B) nucleating agent is based on 100 parts by weight of the mixture with the propylene-ethylene copolymer. (In the formula, R ¹ represents a hydrogen atom or an alkyl group having 1 to 18 carbon atoms, R ² represents an alkyl group having 1 to 18 carbon atoms, Alternatively, it represents M _{1 / a} . In addition, M is Na, K, Mg, C
represents a or Al, and a represents the valence of M. ) An organophosphorus compound and / or a general formula (In the formula, R represents a methylene group, an ethylidene group, a propylidene group or an isopropylidene group, and R ³ and R ⁴ each represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. 0.005 to 1.0 part by weight of an organophosphorus compound represented by the formula (1) is added, and particles having a maximum size of 50 μm or more of the organophosphorus compound are mixed in an amount of 15 per 1 mg of the composition obtained.
A propylene polymer composition comprising 0 or less and (C) 0.01 to 5 parts by weight of an antistatic agent. 2. The propylene polymer composition according to claim 1, wherein the antistatic agent is a nonionic surfactant. 3. An antistatic agent comprising glycerin fatty acid monoester; N, N-bis (2-hydroxyethyl) aliphatic amine; N, N-bis (2-hydroxyethyl) aliphatic amine fatty acid monoester or general formula (However, the integer of m = 7-21, 2 <= p + q <= 4) It is an amide compound represented by these, The propylene polymer composition of Claim 1 or 2.