JP2001310948A - Master batch, polypropylene resin composition and moldings - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a master batch containing a dibenzylidene sorbitol derivative and having good dispersing affinity to polyolefin resin and to provide a polypropylene resin composition and the moldings having excellent transparency and crystallizability and produced economically by using the master batch with good dispersing ability without more addition of the expensive dibenzylidene sorbitol derivative. SOLUTION: This master batch contains (B) 1 to 100 pts.wt. of a dibenzylidene sorbitol compound expressed by the general formula (1) to (A) 100 pts.wt. of polypropylene resin wherein R1-R5 and R'1-R'5 each independently represents an atom or a group selected from the group consisting of hydrogen atom, halogen atom, an alkyl group having 1 to 8 carbons and an alkoxy group having 1 to 8 carbons.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a masterbatch, a polypropylene resin composition and a molded article. More specifically, the present invention relates to a masterbatch containing a dibenzylidene sorbitol-based compound, a polypropylene-based resin composition containing the same, and a molded article containing the same.

[0002]

BACKGROUND OF THE INVENTION Dibenzylidene sorbitols are added in small amounts to polyolefin resins, especially to polymers or copolymers containing α-olefins such as ethylene and propylene as main components. ,
It is known that the compound has an effect of improving the transparency of the resin and is useful as an additive for resins in the field of molding such as various containers requiring transparency. It is also known that the compound is useful as a gelling agent for various organic solvents.

However, since dibenzylidene sorbitols are expensive, it has been desired to obtain a polyolefin resin having high transparency with a small amount of dibenzylidene sorbitol. The dibenzylidene sorbitol used as an additive for the polyolefin resin is usually added to the polyolefin resin in the form of a fine powder. For this reason, the bulk specific gravity is small, the transferability is poor, powdering is likely to occur, the fluidity of the particles is poor, the pipes and hoppers are easily clogged,
Problems such as agglomeration during transport or storage, poor dispersibility in resin, so-called lumps, and nucleating agent effect equivalent to the added amount due to non-uniform dispersion. In addition, there are various problems in handling.

On the other hand, a mixture containing a diacetal powder such as dibenzylidene sorbitol and a binder is mixed at a temperature higher than the melting point or softening point of the binder and lower than the melting point of the diacetal,
It has been proposed to form the resulting compound into granules (WO 98/33851). The present invention aims to improve the apparent specific gravity and dispersibility by forming a diacetal powder into a tablet using a binder. However, there is a problem that it is necessary to contain a large amount of a binder component different from the above.

The inventor of the present invention has conducted intensive studies in view of such circumstances. As a result, a masterbatch composed of a specific dibenzylidene sorbitol compound and a polypropylene resin was easy to handle, and the Have excellent dispersibility, surprisingly, it has been found that it is possible to produce a polypropylene-based resin molded article having much higher transparency than in the case of using a dibenzylidene sorbitol-based compound as a powder. It was completed.

[0006]

An object of the present invention is to provide a masterbatch containing a dibenzylidene sorbitol compound useful as a nucleating agent for a polypropylene resin, and to provide a molded article containing the masterbatch and having high transparency. An object is to provide a polyolefin resin composition and a molded article that can be formed.

[0007]

SUMMARY OF THE INVENTION The first masterbatch of the present invention comprises (A)
1) Syndiotactic polypropylene-based resin 100
(B) 1 to 100 parts by weight of a dibenzylidene sorbitol compound represented by the following general formula (1) based on parts by weight.

[0008]

Embedded image

(Wherein, R _{1 to} R ₅ and R ′ _{1 to} R ′ ₅ each independently represent a hydrogen atom, a halogen atom,
Or an atom or group selected from the group consisting of an alkyl group having 1 to 8 carbon atoms and an alkoxy group having 1 to 8 carbon atoms. ).

[0010] The second masterbatch of the present invention comprises:
(A1) Syndiotactic polypropylene resin 1
(B) 1 to 100 parts by weight of the dibenzylidene sorbitol compound represented by the general formula (1) and (C) 0.01 to 10 parts by weight of zinc stearate with respect to 00 parts by weight. It is characterized by.

Further, the third masterbatch of the present invention comprises:
(A2) Polypropylene resin 1 having a melt flow rate of 10 g / 10 min or more and a melting point of 150 ° C. or less
(B) 1 to 100 parts by weight of a dibenzylidene sorbitol compound represented by the above general formula (1) with respect to 00 parts by weight.

Further, the fourth masterbatch of the present invention is characterized in that (A2) 100 parts by weight of a polypropylene resin having a melt flow rate of not less than 10 g / 10 min and a melting point of not more than 150 ° C. ) Dibenzylidene sorbitol compounds 1 to 10 represented by the following general formula (1)
0 parts by weight and (C) 0.01 to 10 parts by weight of zinc stearate.

The polypropylene resin composition of the present invention comprises:
A composition comprising the masterbatch of the present invention and a polypropylene base resin. When the polypropylene resin composition of the present invention is a composition obtained by blending the third or fourth masterbatch of the present invention with a polypropylene base resin, the polypropylene resin constituting the masterbatch is used. the resin (A2) a melt flow rate (MFR ₁₎ of the polypropylene base resin has a melt flow rate (MFR _2), but it is preferred to satisfy the following formula (a).

MFR ₁ / MFR ₂ > 1.1 (a) The molded article of the present invention is obtained by molding the polypropylene resin composition of the present invention.

[0015]

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the present invention will be described specifically. The masterbatch of the present invention comprises (A1) a syndiotactic polypropylene-based resin, or (A2) a polypropylene-based resin having a melt flow rate of 10 g / 10 min or more and a melting point of 150 ° C. or less; It contains a sorbitol compound and, if necessary, (C) zinc stearate.

In the present invention, the propylene resin is
Refers to a resin having a component unit derived from propylene as a main component, and includes a propylene homopolymer and a copolymer of propylene and an α-olefin other than propylene, and specifically, syndiotactic polypropylene, isopropylene Tactic polypropylene, atactic polypropylene, a propylene-ethylene random copolymer, a propylene-ethylene-butene copolymer, and the like. When the polypropylene-based resin is a copolymer of propylene and an α-olefin other than propylene, the component unit derived from propylene in the polypropylene-based resin is 50 mol% or more, preferably 80 mol%.
It is more preferably at least 90 mol%, particularly preferably at least 95 mol%. <Syndiotactic polypropylene resin (A1)
The syndiotactic polypropylene resin (A1) used in the present invention may be a polypropylene resin having a repeating unit derived from propylene having a substantially syndiotactic structure, and is preferably substantially syndiotactic. A repeating unit derived from propylene as a structure, and optionally one or more repeating units derived from ethylene and an α-olefin having 4 to 20 carbon atoms, wherein the propylene is substantially syndiotactic. Is 80.
Desirably, the resin is from 100 to 100 mol%, more preferably from 90 to 100 mol%.

As the syndiotactic polypropylene resin (A1), especially, propylene
Syndiotacticity city as seen in ad chain is 0.6 or more,
More preferably, it is a syndiotactic polypropylene resin having 0.7 or more.

Using such a syndiotactic polypropylene resin (A1), a polypropylene resin composition obtained by blending the obtained masterbatch with a polypropylene base resin, and a molded article obtained by molding the same Is preferred because it shows better transparency. <Polypropylene resin (A2)> The polypropylene resin (A2) is a polypropylene resin having a melt flow rate of 10 g / 10 minutes or more and a melting point of 150 ° C or less.

Such a polypropylene resin (A2)
As the melt flow rate (MFR; ASTM D 123)
(8, 230 ° C, load 2.16 kg) is 10 g / 10 min or more, preferably 20 to 50 g / 10 min, more preferably 30 to 40 g / 10 min. Further, it is desirable that the melting point is 150 ° C or lower, preferably 100 to 150 ° C, more preferably 130 to 140 ° C.

Such a polypropylene resin (A2)
Is particularly excellent in fluidity, and a masterbatch prepared using the same is preferable because it exhibits excellent dispersibility in the polypropylene base resin to be compounded. <Sorbitol Compound (B)> The sorbitol compound (B) constituting the masterbatch of the present invention is represented by the following general formula (1).

[0021]

Embedded image

(Wherein, R _{1 to} R ₅ and R ′ _{1 to} R ′ ₅ each independently represent a hydrogen atom, a halogen atom,
Or an atom or group selected from the group consisting of an alkyl group having 1 to 8 carbon atoms and an alkoxy group having 1 to 8 carbon atoms. ).

Examples of the dibenzylidene sorbitol compound represented by the general formula (1) include dibenzylidene sorbitol; 1,3-2,4-dibenzylidene sorbitol, and 1,3-2,4-di (p-methyl Benzylidene) sorbitol, 1,3-2,4-di (p-ethylbenzylidene) sorbitol, 1,3-2,4-di (p-chlorobenzylidene) sorbitol, 1,3-2,4-bis (dimethylbenzylidene) ) Compounds having the same benzylidene group, such as sorbitol; 1,3-benzylidene-
2,4-p-methylbenzylidene sorbitol, 1,3
-Benzylidene-2,4-p-ethylbenzylidenesorbitol, 1,3-benzylidene-2,4-p-chlorobenzylidenesorbitol, 1,3-p-methylbenzylidene-2,4-benzylidenesorbitol, 1,3-
p-methylbenzylidene-2,4-p-chlorobenzylidenesorbitol, 1,3-p-methylbenzylidene-
2,4-p-ethylbenzylidene sorbitol, 1,3
-P-ethylbenzylidene-2,4-benzylidenesorbitol, 1,3-p-ethylbenzylidene-2,4-
Compounds having different types of benzylidene groups such as p-methylbenzylidene sorbitol and 1,3-p-ethylbenzylidene-2,4-p-chlorobenzylidene sorbitol are exemplified.

In the above formula (1), R _{1 to} R ₅ and R ′ _{1 to} R ′ ₅ each independently represent a hydrogen atom, a halogen atom, or an alkyl group having 1 to 4 carbon atoms. More preferably, it represents a selected atom or group.

Among them, in the present invention, 1,3-2,4-
Di-p-methylbenzylidene sorbitol or 1,3
It is particularly preferred to use -2,4-di-p-ethylbenzylidene sorbitol.

Such benzylidene sorbitol compounds may be used alone or in combination of two or more. <Masterbatch> The first masterbatch of the present invention comprises:
(A1) 100 parts by weight of the syndiotactic polypropylene resin, (B) 1 to 100 parts by weight of the specific dibenzylidene sorbitol compound, preferably 5 to 70 parts by weight, more preferably 10 to 60 parts by weight. contains.

The second masterbatch of the present invention comprises:
(A1) 100 parts by weight of the syndiotactic polypropylene resin, (B) 1 to 100 parts by weight of the specific dibenzylidene sorbitol compound, preferably 5 to 70 parts by weight, more preferably 10 to 60 parts by weight. And (C) 0.01 to 10 parts by weight of zinc stearate, preferably 0.02 to 5 parts by weight, more preferably 0.05
-1 part by weight.

Further, the third masterbatch of the present invention comprises (A2) 100 parts by weight of a polypropylene resin having a melt flow rate of at least 10 g / 10 min and a melting point of at most 150 ° C. ) 1 to 100 parts by weight, preferably 5 to 70 parts by weight, more preferably 10 to 60 parts by weight of the above specific dibenzylidene sorbitol compound.

Further, the fourth masterbatch of the present invention is characterized in that (A2) the melt flow rate is 10 g / 10
(B) 1 to 100 parts by weight of the above specific dibenzylidene sorbitol compound, preferably 5 to 70 parts by weight, more preferably 5 to 70 parts by weight, based on 100 parts by weight of the polypropylene resin having a melting point of 150 ° C. or less. 10 to 60 parts by weight, and (C) 0.01 to 10 parts by weight of zinc stearate, preferably 0.02 to 5 parts by weight, more preferably 0.05 to 1 part by weight.

These masterbatches of the present invention may contain various additives to be blended with the polypropylene resin. Examples of additives include phenolic antioxidants, phosphorus antioxidants, neutralizing agents such as calcium stearate, antistatic agents, flame retardants, processing aids, pigments,
Fillers, foaming agents, heavy metal deactivators and the like can be mentioned.

The amount of the masterbatch of the present invention is not particularly limited, but is usually 0.1 to 10 parts by weight, preferably 0.3 to 5 parts by weight, per 100 parts by weight of the polypropylene base resin. Parts by weight, more preferably 0.5-3
It is desirable to use it in a ratio of parts by weight, and the component concentration in the master batch can be appropriately adjusted according to the mixing ratio with the base resin.

The masterbatch of the present invention can be obtained by mixing the above components by a known method. For example, a powdery dibenzylidene sorbitol compound (B), zinc stearate (C) and other additives, if necessary, and a polypropylene resin (A1) or (A2) are mixed with a mixer or the like, It can be obtained by mixing using a Banbury mixer, a kneader, an extruder or the like. The shape of the masterbatch of the present invention is not particularly limited, but it is particularly preferable that the masterbatch is in a pellet form.

When such a masterbatch is used for a polypropylene-based base resin, it is far more dispersed than when each component such as a powdery dibenzylidenesorbitol-based compound (B) is directly mixed with a base resin. A composition in which the masterbatch component is uniformly dispersed in the base resin can be obtained.

Such a masterbatch of the present invention can be particularly preferably used by blending with a polypropylene base resin to produce a polypropylene resin composition. <Polypropylene-based resin composition> The polypropylene-based resin composition of the present invention is a composition obtained by mixing the master batch of any one of the first to fourth inventions with a polypropylene-based base resin.

Examples of the polypropylene base resin include propylene homopolymers and copolymers of propylene with α-olefins other than propylene. Specific examples include syndiotactic polypropylene, isotactic polypropylene, and atactic polypropylene. Tick polypropylene, propylene-ethylene random copolymer, propylene-ethylene-butene copolymer, and the like. Polypropylene resin is propylene and α other than propylene
-When it is a copolymer with an olefin, the component unit derived from propylene in the polypropylene resin is 50
It is desirable that it be at least 80 mol%, more preferably at least 80 mol%, more preferably at least 90 mol%, particularly preferably at least 95 mol%.

In the polypropylene resin composition of the present invention, the amounts of the masterbatch and the polypropylene base resin are not particularly limited, but the masterbatch is added to 100 parts by weight of the polypropylene base resin. Usually, it is desirable to mix in a proportion of 0.1 to 10 parts by weight, preferably 0.3 to 5 parts by weight, more preferably 0.5 to 3 parts by weight. In the polypropylene-based resin composition of the present invention, the masterbatch in the polypropylene-based resin composition has a dibenzylidenesorbitol-based compound content of 0.01 to 1% by weight, preferably 0.1 to 1% by weight.
It is also preferable to mix the amount with the polypropylene base resin in an amount of 1 to 0.5% by weight.

The polypropylene resin composition of the present invention may contain additives other than those contained in the master batch. Such a polypropylene-based resin composition of the present invention is obtained by mixing the masterbatch of the present invention, the polypropylene-based base resin, and other additives as necessary with a known method such as melt kneading. It can be prepared, for example, by melt-kneading using an extruder or the like.

In the present invention, as described above, a polypropylene resin composition and a molded article are produced using a masterbatch containing a dibenzylidene sorbitol compound.
A polypropylene resin composition and a molded article which are highly dispersed and uniformly mixed in the polypropylene resin composition can be obtained.

In such a propylene-based resin composition of the present invention, the dibenzylidene sorbitol-based compound is far more uniformly dispersed as compared with the case of using a powder. For this reason, the propylene-based resin composition of the present invention can provide a molded article having excellent crystallinity at the time of molding and excellent in transparency and strength without increasing the content of the expensive dibenzylidene sorbitol-based compound. it can.

Such a polypropylene resin composition of the present invention comprises the first or second masterbatch,
When the polypropylene base resin is melt-kneaded, that is, (A1) the syndiotactic polypropylene resin, (B) the specific dibenzylidene sorbitol compound, and if necessary, (C) zinc stearate Is preferably kneaded and melt-kneaded with a polypropylene-based base resin, because a polypropylene-based resin composition is particularly excellent in crystallinity and a molded article having particularly excellent transparency can be produced.

In the case where such a polypropylene resin composition of the present invention is obtained by melt-kneading the third or fourth master batch and a polypropylene base resin, ie, (A2) melt flow Rate is 10
g / 10 min or more and a melting point of 150 ° C. or less, a masterbatch containing (B) the above-mentioned specific dibenzylidenesorbitol-based compound and, if necessary, (C) zinc stearate. , when the polypropylene-based base resin formed by melt-kneading, the melt flow rate of the polypropylene resin constituting the masterbatch (A2) (MFR _1), polypropylene base resin has a melt flow rate (MFR ₂ ) Preferably satisfies the following formula (a): MFR ₁ / MFR ₂ > 1.1 (a), and satisfies the following formula (a ′): MFR ₁ / MFR ₂ > 1.2 (a ′) It is more preferable that the following formula (a ″) MFR ₁ / MFR ₂ > 1.5 (a ″) is satisfied.

A melt flow rate (MFR ₁ ) of the polypropylene resin (A2) constituting the master batch;
Melt flow rate of polypropylene base resin (MF
When R ₂ ) satisfies the above relationship, the dispersibility of the masterbatch in the polypropylene-based base resin is particularly excellent, and a polypropylene-based resin composition having a uniform composition is easily obtained. <Molded Article> The molded article of the present invention is obtained by molding the polypropylene resin composition of the present invention.

The method for molding the molded article is not particularly limited, and any method capable of molding ordinary polypropylene resin can be employed. For example, injection molding, extrusion molding, blow molding, injection molding, Blow molding and the like. The shape of the molded body is not particularly limited, such as a bottle, a container, a plate, a sheet, and a film.
It can be obtained by molding into a shape suitable for the purpose.

As described above, by producing a polypropylene resin composition and a molded article using a masterbatch containing a dibenzylidene sorbitol compound,
The dibenzylidene sorbitol compound is highly dispersed in the polypropylene resin composition to form a uniform composition. Therefore, the molded article of the present invention can be produced without excessively using an expensive dibenzylidene sorbitol compound, and is excellent in transparency and strength, and particularly excellent in transparency.

[0045]

According to the present invention, it is possible to provide a masterbatch containing a dibenzylidene sorbitol compound and having excellent dispersibility in a polyolefin base resin. Further, according to the present invention, by using a masterbatch excellent in dispersibility, without increasing the amount of expensive dibenzylidene sorbitol-based compound and the like, without increasing the transparency and crystallinity polypropylene-based The resin composition and the molded article can be provided economically.

[0046]

EXAMPLES Hereinafter, the present invention will be described more specifically based on examples, but the present invention is not limited to these examples.

[0047]

Example 1 Preparation of Masterbatch 70% by weight of polypropylene resin powder (propylene-ethylene-butene copolymer; ethylene content 3.4% by weight, butene content 2.9% by weight, MFR: 31 g / 10 minutes) Parts, 1,3-2,4-di-p-methylbenzylidene sorbitol powder (NC-6, manufactured by Mitsui Chemicals, Inc.) 30 parts by weight,
After mixing 0.1 part by weight of zinc stearate and 0.05 part by weight of a phosphorus antioxidant (Irgafos 168, manufactured by Ciba Specialty Chemicals) in a blender,
0mmφ single screw extruder (GMZ50-32, G.M.
Engineering), resin temperature 260 ° C., screw rotation speed: 80 rpm, screen mesh: 6
Kneading and extruding under the conditions of 0/100/60,
A pellet-shaped master batch (A) was obtained. Preparation and molding of resin composition 10 kg of propylene-ethylene random copolymer (ethylene content 3.6% by weight, MFR: 8.0 g / 10 minutes)
5 g of a phenolic antioxidant (Irganox 1010, manufactured by Ciba Specialty Chemicals) and a phosphorus antioxidant (Irgafos 168, Ciba Specialty Chemicals)
Chemicals) 10g and calcium stearate 1
After mixing with 0 g in a blender, using a 50 mmφ single screw extruder (GMZ50-32, manufactured by G.M. Engineering), 260 ° C., screw rotation speed: 80 r.
pm, screen mesh: kneading and extrusion were performed under the conditions of 60/100/60 to prepare polypropylene-based base resin pellets.

This polypropylene base resin pellet 9
After 9 parts by weight and 1 part by weight of the master batch (A) were mixed by a blender, a 50 mmφ single screw extruder (GMZ50) was used.
-32, manufactured by G.M. Engineering Co., Ltd.), resin temperature 260 ° C., screw rotation speed: 80 rpm
m, screen mesh: kneading and extruding under the conditions of 60/100/60 to give 1,3-2,4-di-p-
Pellets of the resin composition (A) containing 0.3% by weight of methylbenzylidene sorbitol were prepared.

Next, using the pellets of the obtained resin composition (A), a Nikko molding machine (J100S, 100 ton) was used.
And a molding temperature of 190 using a flat mold (2 mm).
A flat plate having a thickness of 2 mm was injection molded at a temperature of 50 ° C. and a mold temperature of 50 ° C.

Using the obtained flat plate as a sample, a haze value was measured using a tester (1001DP) manufactured by Nippon Denshoku Industries Co., Ltd. As a result, the haze value was 21.1%.

[0051]

Example 2 Preparation of master batch In Example 1, 80 parts by weight of propylene resin powder and 20 parts by weight of 1,3-2,4-di-p-methylbenzylidenesorbitol powder were used. Other than that,
A master batch (B) was prepared in the same manner as in Example 1. Preparation and molding of resin composition 98.5 parts by weight of polypropylene base resin pellets prepared in the same manner as in Example 1 and master batch (B)
Kneading and extrusion were performed in the same manner as in Example 1 except that 1.5 parts by weight were used, and 0.3% by weight of 1,3-2,4-di-p-methylbenzylidenesorbitol was added.
A pellet of the resin composition (B) was prepared.

Next, except that pellets of the obtained resin composition (B) were used, the thickness was adjusted to 2
As a result of measuring the haze value of the obtained flat plate as a sample, the haze value was 21.1%.

[0053]

Example 3 Preparation of Masterbatch In Example 2, as a polypropylene resin powder, syndiotactic polypropylene (Thiaro, manufactured by Mitsui Chemicals, Inc., syndiotacticity: 0.8, MF)
A master batch (C) was prepared in the same manner as in Example 2 except that R: 4.1) was used. Preparation and molding of resin composition In Example 2, kneading and extrusion were carried out in the same manner as in Example 2 except that the master batch (C) was used instead of the master batch (B). −2,4
-A pellet of the resin composition (C) containing 0.3% by weight of di-p-methylbenzylidene sorbitol was prepared.

Next, the same procedure as in Example 1 was repeated except that pellets of the obtained resin composition (C) were used.
A flat plate having a thickness of 1 mm was injection molded, and a haze value was measured using the obtained flat plate as a sample. As a result, the haze value was 19.1%.

[0055]

Comparative Example 1 Propylene-ethylene random copolymer (ethylene content: 3.6% by weight, MFR: 8.0 g / 1
0 minutes) 10 kg, 1,3-2,4-di-p-methylbenzylidene sorbitol powder (NC-6, manufactured by Mitsui Chemicals, Inc.), and a phenolic antioxidant (Irganox 1010, Ciba・ Specialty Chemicals)
5 g and a phosphorus antioxidant (Irgafos 168, Ciba
Specialty Chemicals) (10 g) and calcium stearate (10 g) were mixed in a blender.
Using a 50 mmφ single-screw extruder (GMZ50-32, manufactured by GM Engineering Co., Ltd.), 260 ° C., screw rotation speed: 80 rpm, screen mesh: 60/1
Kneading and extruding under the conditions of 00/60,
Pellets of a polypropylene resin composition (D) containing 0.3% by weight of -2,4-di-p-methylbenzylidene sorbitol were prepared.

Next, except that pellets of the obtained resin composition (D) were used, the thickness
A flat plate having a thickness of 2 mm was injection molded, and a haze value was measured using the obtained flat plate as a sample. As a result, the haze value was 24.1%.

From these Examples and Comparative Examples, the molded articles obtained from the resin compositions of Examples 1 to 3 prepared using the master batch of the present invention were obtained from Comparative Example 1 prepared without using the master batch. Compared to the molded product obtained from the resin composition, the haze value is remarkably small and the transparency is excellent despite the same amount of the dimethylbenzylidene sorbitol-based compound.

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Claims (8)

[Claims] The present invention is characterized in that (B1) 1 to 100 parts by weight of a dibenzylidene sorbitol compound represented by the following general formula (1) is contained with respect to 100 parts by weight of a syndiotactic polypropylene resin. Master batch to be used: (Wherein, R _{1 to} R ₅ and R ′ _{1 to} R ′ ₅ each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 8 carbon atoms, or an alkoxy group having 1 to 8 carbon atoms. Represents the selected atom or group). 2. (B1) 1 to 100 parts by weight of a dibenzylidene sorbitol compound represented by the following general formula (1) per 100 parts by weight of a syndiotactic polypropylene resin, and (C) stearin Zinc acid 0.01
A masterbatch characterized by containing 10 to 10 parts by weight; (Wherein, R _{1 to} R ₅ and R ′ _{1 to} R ′ ₅ each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 8 carbon atoms, or an alkoxy group having 1 to 8 carbon atoms. Represents the selected atom or group). 3. A polypropylene resin composition comprising the master batch according to claim 1 and a polypropylene base resin. (A2) The melt flow rate is 10 g / 1.
(B) 1 to 100 parts by weight of a dibenzylidene sorbitol compound represented by the following general formula (1) based on 100 parts by weight of a polypropylene resin having a melting point of 150 ° C. or less for 0 minutes or more. A masterbatch characterized by the following: (Wherein, R _{1 to} R ₅ and R ′ _{1 to} R ′ ₅ each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 8 carbon atoms, or an alkoxy group having 1 to 8 carbon atoms. Represents the selected atom or group). (A2) The melt flow rate is 10 g / 1.
(B) 1 to 100 parts by weight of a dibenzylidene sorbitol compound represented by the following general formula (1) based on 100 parts by weight of a polypropylene resin having a melting point of 150 ° C. or less for 0 minutes or more; ) Zinc stearate 0.01
A masterbatch characterized by containing 10 to 10 parts by weight; (Wherein, R _{1 to} R ₅ and R ′ _{1 to} R ′ ₅ each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 8 carbon atoms, or an alkoxy group having 1 to 8 carbon atoms. Represents the selected atom or group). 6. A polypropylene resin composition comprising the masterbatch according to claim 4 and a polypropylene base resin. 7. A melt flow rate (MFR ₁ ) of a polypropylene resin (A2) constituting a master batch,
Melt flow rate of polypropylene base resin (MF
R ₂ ) satisfies the following formula (a). MFR ₁ / MFR ₂ > 1.1 (a) 8. A molded product obtained by molding the polypropylene resin composition according to claim 3, 6, or 7.