JPS62241942A - Propylene polymer composition - Google Patents

Abstract

PURPOSE:To provide the titled compsn. having excellent (high-temperature) rigidity, transparency and antistatic properties, by blending a propylene polymer with a specified phosphate compd. and an antistatic agent. CONSTITUTION:100pts.wt. propylene polymer (A) (e.g., a propylene homopolymer) is blended with 0.01-5pts.wt. phosphate compd. (B) of the formula (wherein R1 is a direct bond, S, or a 1-4C alkylidene; R2 and R3 are each H or a 1-8C alkyl; M is a mono- - trivalent metal; and n is a number of 1-3) [e.g., sodium 2,2'-methylene-bis-(4,6-di-t-butylphenyl)phosphate], 0.01-5pts.wt. antistatic agent (C), pref. nonionic surfactant [e.g., N,N-bis(2-hydroxyethyl)stearylamine] and optionally, additives such as an antioxidant, a light stabilizer, a clarifier, a nucleating agent, a lubricant, etc. The mixture is melt-mixed at 150-300 deg.C and pelletized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a propylene polymer composition. More specifically, the present invention relates to a propylene-based polymer composition that has high rigidity, heat-resistant rigidity, transparency, and antistatic properties.

[Conventional technology]

-e Propylene polymers have excellent processability and mechanical properties, so they are processed into injection molded products, blow molded products, films, sheets, fibers, etc. and used for various purposes. However, propylene-based polymers have poor mechanical properties'J! On the other hand, the propylene-based polymer has poor transparency due to its high crystallinity, which limits its usage. For this reason, various nucleating agents have conventionally been used for the purpose of improving the transparency of propylene polymers. Dibenzylidene sorbitol (hereinafter abbreviated as DBS) type compounds are widely used because they have a relatively excellent effect of improving transparency.

In addition, propylene-based polymers have the disadvantage that the surface of molded products is easily stained due to the non-polar nature of the propylene-based polymers, which causes them to become easily charged, which limits their use in applications that require antistatic properties. There's a problem.

However, in recent years, as fields requiring a high degree of transparency have increased, it has been proposed that propylene-based polymers include propylene, ethylene, butene-1, pentene-1, hexene-1, and octene-based polymers. However, when the random copolymer is used, a problem arises in that the molded product, when made into a molded product, lacks mechanical properties such as rigidity and heat-resistant rigidity. In order to solve these problems,
Propylene polymer with sulfonic acid metal salt and nonionic surfactant (JP-A-49-103941), DBS
A propylene polymer composition has been proposed, which contains a compound and an antistatic agent (JP-A-58-157840).

[Problems to be Solved by the Invention] However, although the use of antistatic agents in propylene polymer compositions containing various nucleating agents and antistatic agents provides excellent antistatic properties, The composition proposed in JP-A No. 49-103941, which uses a sulfonic acid metal salt and a nonionic surfactant in combination, has an effect of improving transparency, (III) and heat-resistant rigidity of the composition. However, the composition proposed in JP-A No. 58-157840, which uses a DBS compound and an antistatic agent in combination, is not yet fully satisfactory. Although transparency is significantly improved,
The DBS compound bleeds out to the surface of the molded product over time, causing problems such as a significant decrease in transparency and appearance and inhibition of the antistatic effect of the antistatic agent.

1&, the effects of improving the stiffness and heat-resistant stiffness of the composition are still not fully satisfactory.

The inventors of the present invention have conducted extensive research in order to solve the problems associated with the above-mentioned propylene-based polymers which are made by blending the various nucleating agents and antistatic agents described above. As a result, a composition obtained by blending a phosphate compound represented by the following general formula (1) (hereinafter referred to as compound A, j) and an antistatic agent with a propylene polymer has been found to solve the problems of the propylene polymer described above. The inventors have discovered that this problem can be solved, and have completed the present invention based on this knowledge.

(In the formula, R2 is an iI! chain bond, sulfur or an alkylidene group having 1 to 4 carbon atoms, R7 and R3 are each hydrogen or the same or different alkyl group having 1 to 8 carbon atoms, and M is a monovalent to (n represents an integer of 1 to 3.) As is clear from the above description, the purpose of the present invention is to improve rigidity,
An object of the present invention is to provide a propylene polymer composition excellent in heat-resistant rigidity, transparency, and antistatic properties.

(Means for solving problems) The present invention has the following configuration.

To 100 parts by weight of the propylene polymer, 0.01 to 0.01 to 0.0% of each of the 7 male 7-functional compound represented by the following general formula (1) (hereinafter referred to as compound A) and the antistatic agent are added to 100 parts by weight of the propylene polymer.
5 parts by weight (in the formula, R is a linear bond,
Sulfur or an alkylidene group having 1 to 4 carbon atoms, R6 and R3 each represent hydrogen or the same or different alkyl group having 1 to 8 carbon atoms, M is a monovalent to trivalent metal atom gold,
n represents an integer of 1 to 3. ) Propylene polymers used in the present invention include propylene homopolymers, propylene and ethylene, Phthene-1,
Pentene-1, hexene-1° polymer or block copolymer, copolymer of propylene with vinyl acetate, acrylic ester, etc. or saponified product thereof, or copolymer of propylene with unsaturated carboxylic acid or its anhydride Examples include a reaction product of a copolymer or a metal ion compound, and these propylene polymers can be used alone or as a mixture of two or more propylene polymers. . Furthermore, a modified propylene polymer obtained by modifying a propylene polymer with an unsaturated carboxylic acid or a derivative thereof, or a mixture of the modified propylene polymer and an unmodified propylene polymer can also be used. In addition, the above propylene polymer and synthetic rubber (for example, ethylene-propylene copolymer rubber 1
．． Ethylene-propylene-nonconjugated diene copolymer rubber,
Polybutadiene, polyisoprene, chlorinated polyethylene, chlorinated polypropylene, styrene-butadiene rubber, styrene-butadiene-styrene block copolymer,
Styrene-isoprene-styrene block copolymer, styrene-dityrene-butylene-styrene block copolymer, styrene-propylene-butylene-styrene block copolymer, etc.) or thermoplastic synthetic resin (e.g. evaporated polyethylene, polybutene, poly-4 -melpentene-1
Polyolefins other than propylene polymers such as polystyrene, styrene-acrylonitrile copolymer, acrylonitrile-butadiene-styrene copolymer, polyamide, polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride, etc.) can also be used. . Particularly preferred are propylene 13-element copolymers.

Compound A used in the present invention includes sodium-2,
z-methylene-bis-(4,6-di-t-butylphenyl)phosphate, sodium-2,2'-ethylidene-bis-(4,6-se-t-7'tylphenyl)phosphate, lithium-2 ,2'-methylene-bis-(
4,6-sheet t-7'tylphenyl) 7m7ate,
Lithium-2,'2'-ethylidene-bis(4゜6-
di-t-butylphenyl) 7 phosphate, sodium-2,2'-ethylidene-bis-(4-i-7''ropyru-6-t-butylphenyl) phosphate, lithium-2,2'-methylene-bis- (4,-methyl-6-t
-7'tylphenyl)phosphate, lithium-2,
2'-methylene-bis-(4-ethyl-6-t-butylphenyl)phosphate, calcium-bis-(2゜2'-thiobis-(4-methyl-6-t-butylphenyl)phosphate ], calcium bis-(2,2'
-thiobis-(4-ethyl-6-t-butylphenyl)
phosphate], calcium bis-(2,2'-thiobis-(4,6-sheet t-7" tylphenyl) phosphate), magnesium-bis-(2,2'-thiobis-(4,6-di- -t-butylphenyl)7 phosphate], magnesium-bis-(2,2'-thiobis-(
4-t-octylphenyl) phosphate], sodium-2,2'-butylidene-bis-(4,6-di-methylphenyl)phosphate, sodium-2,2'
-Butylidene-bis-(4,6-di-t-butylphenyl)phosphate, sodium-2,2'-t-octylmethylene-bis-(4,6-di-methylphenyl)
7 male 7 ate, sodium-2゜2-t-octylmethylene-bis-(4,6-sheet t-7'tylphenyl)
7 male 7 ate, calcium bis-(2,2'-methylene-bis-(4,6-sheet t-7'' tylphenyl) phosphate), magnesium-bis-(2,2'-methylene-bis-( 4,6-di-t-butylphenyl) phosphate], barium-bis-(2,2'-methylene-bis-(4,6-di-butylphenyl)phosphate)], sodium-2,2 '-methylene-bis-
(4-Methyl-6-t-butylphenyl)phosphate, sodium-2,τ-methylene-bis(4-ethyl-6-t-butylphenyl)phosphate, sodium-(4,4'-di-methyl-6゜Dazy also monobutyl-2,2'-biphenyl) phosphate, calcium bis-((4,4'-dimethyl-6,6'-di-t)
-bunaru 2.2'-biphenyl) phosphate],
Sodium-2,2'-ethylidene-bis-(4-8-
butyl-6-t-butyl 71enyl) 7m7ate,
Sodium-2,2'-methylene-bis-(4゜6-di-methylphenyl)phosphate, sodium-2,
2'-methylene-bis-(4,6-cynitylphenyl)phosphate, potassium-2,2'-ethylidene-
Bis-(4,6-di-t-butylphenyl)phosphate, Calcium-bis-(2,2'-ethylidene-bis-(4,6-di-t-7"tylphenyl)phosphate), Magnesium- bis-(2,2'-ethylidene-bis-(4,6-di-t-7'-phenyl)phosphate)], barium-bis-(2,2'-ethylidene-bis-(4,6- di-t-butylphenyl) phosphate], aluminum tris-(2,2'-methylene-bis-(4,6-di-t-butylphenyl)7 phosphate)] or aluminum tris-(2,2'
-ethylidene-bis-(4,6-di-t-butylphenyl)phosphate) can be exemplified. Particularly preferred is sodium-2,2'-methylene-bis-(4,6-di-t-butylphenyl)phos7A1. The antistatic agent is not particularly limited and any known antistatic agent may be used, but antistatic agents consisting of nonionic surfactants that are thermally stable during molding of propylene polymers are preferred, such as glycerin monolaurate, glycerin monolaurate, Glycerin fatty acid esters such as glycerin monostearate, glycerin monopalmitate, glycerin monostearate, glycerin monobehenate, chrycerin monooleate, diglycerin monolaurate, diglycerin monomyristylate, diglycerin monobalmitate , diglycerin fatty acid esters such as diglycerin monostearate, diglycerin monobehenate, diglycerin monooleate, sorbitan fatty acid esters, propylene glycol fatty acid esters, sucrose fatty acid esters, citric acid mono (di or tri) stearyl esters, penta Erythritol fatty acid ester, trimethylol, propane fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene rubitan fatty acid ester,
Polyethylene glycol fatty acid ester, polypropylene glycol fatty acid ester, polyoxyethylene fatty alcohol ether, polyoxyethylene alkylphenyl ether, polyoxypropylene-polyoxyethylene block polymer, polyethylene glycol, polypropylene glycol, N, N-bis (2-hydroxyethyl)laurylamine, N,N-bis(2-hydroxyethyl)myristylamine, N,N-bis(2-hydroxyethyl)palmitylamine, N,N-bis(2-hydroxyethyl)palmitylamine,
N such as -hydroxyethyl)stearylamine, N,N-bis(2-hydroxyethyl)oleylamine.

N-bis(2-hydroxyethyl) aliphatic amine, N,
N-bis(2-hydroxyisopropyk)? r:
y I) Ruamine, N,N-bis(2-hydroxyisopropyl)myristylamine%NlN-bis(2-hydroxyisopropyl)palmitylamine, N,N-bis(2-hydroxyisopropyl)stearylamine, N
, N,N-bis(2-hydroxyisopropyl) aliphatic amines such as N-bis(2-hydroxyisopropyl)oleylamine, N,N-bis(2-hydroxyethyl)laurylamide, N,N-bis(2- hydroxyethyl) myristylamide, N,N-bis(2-in-hydro)
ethyl) palmitylamide, N,N-bis(2-hydroxyethyl)stearylamide, N,N-bis(2-hydroxyethyl)behenylamide, N.

N,N-bis(2-hydroxyethyl) fatty acid amides such as N-bis(2-hydroxyethyl)oleylamide, N,N-bis(2-hydroxyisopropyl)laurylamide, N,N-bis(2-hydroxy inpropyl) myristylamide, N,N-bis(2-hydroxyisopropyl)palmitylamide, N,N-bis(2-hydroxyisopropyl)stearylamide, N,N-bis(2-hydroxyisopropyl)oleylamide, etc. Examples include N,N-bis(2-hydroxyisopropyl) fatty acid amide, or the mono- or diester of the aforementioned N,N-bis,(2-hydroxyethyl)aliphatic amine and fatty acid such as lauric acid or stearic acid. . Especially glycerin fatty acid monoester, N,N-bis(
Preference is given to fatty acid monoesters of 2-hydroxyethyl) aliphatic amines or N,N-bis(2-hydroxyethyl) aliphatic amines. The compounding ratio of Compound A and the antistatic agent is 0.01 to 5 parts by weight, preferably 0.05 to 1 part by weight, per 100 parts by weight of the propylene polymer. If the amount is less than 0.01 parts by weight, the desired effects such as rigidity, heat-resistant rigidity, transparency, and antistatic properties will not be sufficiently exhibited, and if it is more than 5 parts by weight, it is fine, but the effects will not improve further. Not only is it impractical as it cannot be expected to do so, but it is also uneconomical.

The composition of the present invention contains various additives that are usually added to polyolefins, such as antioxidants such as phenol, thioether, and phosphorus, light stabilizers, and clarifying A11.
, nucleating agents, lubricants, antistatic agents, antifogging agents, antiblocking agents, anti-drop agents, pigments, heavy metal deactivators (copper inhibitors), radical generators such as peroxides, metal soaps, etc. Dispersants or neutralizing agents - inorganic fillers (e.g. talc, mica, clay, wollastonite, zeolite, asbestos, calcium carbonate, aluminum hydroxide, magnesium hydroxide, barium sulfate, calcium silicate, glass fiber, The inorganic filler or organic filler (carbon fiber, etc.) is surface-treated with a surface treatment agent such as a coupling agent (e.g., silane, titanate, poron, aluminate, zircoaluminate, etc.). For example, wood flour, pulp, waste paper, synthetic fibers, natural fibers, etc.) can be used in combination without impairing the purpose of the present invention.

The composition of the present invention contains the above compound A in the propylene polymer,
A predetermined amount of the antistatic agent and the above-mentioned various additives that are usually added to propylene polymers are mixed using a conventional mixing device such as a Hensel mixer (trade name), a Super Mixer, a Rezenplender, a Pan Bali mixer, etc. Obtained by melt-kneading and pelletizing using an ordinary single-screw extruder, twin-screw extruder, plastic bender, roll, etc. at a melt-kneading temperature of 150°C to 300'C, preferably 180°C to 27.0°C. Can be done. The obtained composition is used to produce a desired molded article by various molding methods such as injection molding, extrusion molding, and blow molding.

The composition of the present invention has excellent rigidity, heat-resistant rigidity, transparency, and antistatic properties, so it can be used in various molding products.
Especially food containers, food packaging, cosmetic containers, stationery and V
It can be advantageously used for applications such as TR cassette cases.

(Function) In the present invention, Compound A acts as a nucleating agent to improve stiffness, heat-resistant stiffness, and transparency, as disclosed in JP-A-58-1736, and the antistatic agent acts to improve antistatic properties. .

However, by using Compound A and an antistatic agent together, there is no lack of rigidity, heat-resistant rigidity, and transparency that is seen in conventional combinations of nucleating agents and antistatic agents, and It has been found that no deterioration in appearance or antistatic effect occurs.

〔effect〕

The composition of the present invention has (
1) Excellent rigidity, heat-resistant rigidity, and transparency.

(2) The antistatic property is extremely excellent, and the appearance and antistatic effect do not deteriorate due to the nucleating agent used.

〔Example〕

EXAMPLES The present invention will be specifically explained below using Examples and Comparative Examples, but the present invention is not limited thereto.

Incidentally, the n number method used in the Examples and Comparative Examples was as follows.

■) Rigidity: using the obtained pellet i, length 100 decoys, width 1
．． A test piece with 0H1 thickness and 4 fins was created by injection molding method,
The bending elastic modulus was measured using the test piece (JIS K 72
The rigidity was evaluated by the following method (based on 03).

l) Heat-resistant rigidity: Length using the obtained belen) 1, 130
+wt, width 13jrl, thickness 6.5mm test piece was created by injection molding method, and the heat distortion temperature was measured using the test piece (according to JIS K 7207; 4.6kqf/d load). Rigidity was evaluated.

■) Transparency: Obtained Vertical) 1-Using length 50fi
A test piece with a width of 25ff and a thickness of lff was prepared by injection molding, and immediately after molding, the test piece was placed at a temperature of 23°C and a relative humidity of 5.
Transparency was evaluated by measuring the haze of the test piece (based on ASTM D-1003-61) after being left under 0% conditions for 7 days.

■) Antistatic property: Using the obtained pellets, the length is 100 mm.
A test piece with a width of 100 m and a thickness of 2 ff was prepared by injection molding, and immediately after molding, the test piece was left at a temperature of 23°C and a relative humidity of 50% for 7 days. Antistatic properties were evaluated by measuring specific resistance (based on JIS K 6911).

V) Appearance: Using the obtained pellets, the length is 50 mm and the width is 5 mm.
0fi, a test piece with a thickness of 2 ml was prepared by injection molding, and the test piece was placed in a circulating hot air oven adjusted to a temperature of 80°C for one day, and then visually inspected for bleed-out. The appearance was categorized into the following four grades and evaluated by observing the properties.

◎; Good O; Fair Δ; Slightly inconsistent ×; Bad Examples 1 to 3, Comparative Examples 1 to 9 As a propylene polymer, MFR (molten resin for 10 minutes when 9f was added to load M2A6 at 230°C discharge 1 t)2. To 100 parts by weight of powdered propylene homopolymer of /10 minutes, sodium-2,
2'-methylene-bis-(4,6-di-t-butylphenyl) 7m7ate, glycerin monostearate as an antistatic agent, N,N-bis(2-hydroxyethyl)stearylamine tL<UN, Predetermined amounts of N-bis(2-hydroxyethyl)stearylamine monostearate and other additives were placed in a Hensel mixer (trade name) at the ratios listed in Table 1 below, and mixed by stirring for 3 minutes. The mixture was melted and mixed at 200°C in a single-screw extruder with a rear diameter of 4Qrzx, and subjected to bereta-f. Further, as Comparative Examples 1 to 9, predetermined amounts of additives listed in Table 1 below were added to 100 parts by weight of a powdered propylene homopolymer with an MFR of 2.0 g/10 minutes, based on Examples 1 to 3. to obtain pellets.

The test pieces used for rigidity, heat resistance rigidity, transparency, antistatic property, and appearance evaluation were obtained by heating the pellets at a resin temperature of 250°.
#) Prepared by injection molding at C.

Rigidity, heat-resistant rigidity, transparency, antistatic property, and appearance were evaluated using the test method described above using the obtained test piece.

These results are shown in Table i1.

Examples 4 to 6, Comparative Examples 10 to 18 Sodium-2,2'-methylene-bis-(4,6-di-t -butylphenyl) 7 phosphate, glycerin monostearate as an antistatic agent, N
, N-bis(2-hydroxyethyl)stearylamine or UN, monostearate of N-bis(2-hydroxyethyl)stearylamine, and other additives, respectively, with the predetermined t set forth in Table 2 below. Put it in a Hensel mixer (product name) and mix it for 3 minutes.
The mixture was melt-kneaded and pelletized using a TM single-screw extruder at 2 t) O'C. Also combined (ethylene content f3.8% by weight)
100! A test piece was prepared by adding a predetermined amount of each of the additives listed in the g
Prepared by injection molding at °C.

Using the obtained test piece, stiffness, heat resistance stiffness, transparency, antistatic property, and appearance were evaluated according to the test method described above. These results are shown in the second garment.

Examples 7 to 9, Comparative Examples 19 to 27 - 100 parts by weight of a 13-element co-I polymer (containing ethylene: 8.5% by weight, containing butene-1: 4.5% by weight), compound A
Sodium-2,2'-methylene-bis-(4,
6-di-t-butylphenyl) phosphate, glycerin monostearate as antistatic agent, N,N-bis(2-hydroxyethyl)stearylamine or N
, N-bis(2-hydroxyethyl)stearylamine monostearate, and other additives in the proportions listed in Table 3 below were placed in a Hensel mixer (product name), and mixed by stirring for 3 minutes. After that, 100 parts by weight of a terminal ethylene-propylene-butene-13 copolymer (ethylene content: 8.5% by weight, butene-1 content: 4.5% by weight) was extruded at 200°C in a single-screw extruder with a diameter of 401El. Examples 7 to 9 were prepared by blending predetermined amounts of each of the additives listed in Table 3.
Pellets were obtained according to.

The test pieces used for rigidity, heat resistance rigidity, transparency, antistatic property, and appearance evaluation are the obtained pellets at a resin temperature of 250°C.
It was prepared by injection molding.

Rigidity, heat-resistant rigidity, transparency, antistatic property, and appearance were evaluated using the test method described above using the obtained test piece. These results are shown in Table 3.

The compounds and additives according to the present invention shown in Tables 1 to 3 are as follows.

Compound A; Sodium-2,2'-methylene-bis-(
4,6-di-t-butylphenyl) 7 phosphate antistatic agent (■); glyceri/monostearate antistatic agent (I) iN, N-bis(2-hydroxyethyl)
Stearylamine antistatic agent (1) iN, N-bis(2-hydroxyethyl)stearylamine monostearate nucleating agent 1ip-t-butylbenzoate aluminum nucleating agent 271,3,2,4-dibenzylidene sorbitol Nucleating agent 3; Sodium-bis-(4-t-butylphenyl)7-ophosphate phenolic antioxidant 1 i2,6-di-t-butyl-p-cresol phenolic antioxidant 2; Tetrakis [methylene -3
-(3',5'-di-t-butyl-4'-hydroxyphenyl)propionate comethane phosphorus antioxidant INtetrakis(2,4-di-t-butylphenyl)-4,4'-butylphenyl Phenylene-diphosphonitophosphoric antioxidant 2; Bis(2,4-di-1-butylphenyl)-pentaerythritol-siphosphite Ca-St; Calcium stearate Examples and comparisons listed in Table 1 An example is a case where a propylene homopolymer is used as the propylene monomer. As can be seen from Table 1, Examples 1 to 3 are combinations of Compound A according to the present invention and an antistatic agent, and Examples 1 to 3 and Comparative Examples 1 to 3 (conventionally known aromatic carboxylic acid salts) When comparing the combination system of a nucleating agent and an antistatic agent consisting of Recognize. In addition, Comparative Examples 4 to 4, which are combination systems of DBS-based compounds and antistatic agents.
Comparing Example 6 with Examples 1 to 3, it can be seen that Comparative Examples 4 to 6 are considerably inferior in terms of rigidity.

Furthermore, by using a DBS-based compound in combination with an antistatic agent, it is promoted that the DBS-based compound bleeds out to the surface of the molded product over time.
It is clear from Comparative Examples 4 to 6 that the excellent transparency/clarity improvement effect originally possessed by the system compound is inhibited, and problems such as deterioration of appearance and antistatic properties occur. Furthermore, when comparing Comparative Examples 7 to 9 in which a nucleating agent made of a phosphate compound other than Compound A of the present invention and an antistatic agent were used in combination with Examples 1 to 3, the antistatic properties and appearance were in agreement with the artist's consensus. Although there is no difference, it can be seen that the effects of improving rigidity and transparency are still insufficient.

The same effects as those described above were confirmed for these as well.

This indicates that the composition of the present invention is superior in all respects of rigidity, heat-resistant rigidity, transparency, antistatic property, and appearance compared to conventionally known compositions that use a combination of a nucleating agent and an antistatic agent. It was found that the composition of the present invention was excellent, and the remarkable effect of the composition of the present invention was confirmed.

that's all

Claims (6)

[Claims] (1) To 100 parts by weight of the propylene polymer, add 0% each of a phosphonate compound represented by the following general formula [I] (hereinafter referred to as compound A) and an antistatic agent.
．． A propylene polymer composition containing 01 to 5 parts by weight. ▲There are mathematical formulas, chemical formulas, tables, etc.▼(I) (However, in the formula, R_1 is a linear bond, sulfur, or 1 carbon number.
~4 alkylidene group, R_2 and R_3 each represent hydrogen or the same or different alkyl group having 1 to 8 carbon atoms, M represents a monovalent to trivalent metal atom, and n represents an integer of 1 to 3. ) (2) In the general formula [I], R_1 is a methylene group, R
The propylene polymer composition according to claim (1), wherein the alkyl groups represented by_2 and R_3 are t-butyl groups. (3) The propylene polymer according to claim (1), which contains sodium-2,2'-methylene-bis-(4,6-di-t-butylphenyl) phosphate as compound A. Composition. (4) The propylene polymer composition according to claim (1), which contains a nonionic surfactant as an antistatic agent. (5) Contains glycerin fatty acid monoester, N,N-bis(2-hydroxyethyl) aliphatic amine, or fatty acid monoester of N,N-bis(2-hydroxyethyl) aliphatic amine as an antistatic agent. A propylene polymer composition according to claim (1). (6) The propylene polymer is a propylene homopolymer, a crystalline ethylene-propylene random copolymer, a crystalline propylene-butene-1 random copolymer, a crystalline ethylene-propylene-butene-1 ternary copolymer, or The propylene polymer composition according to claim (1), which is a crystalline propylene-hexene-butene-1 ternary copolymer.