JP2779674B2 - Crystalline polyolefin composition - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a crystalline polyolefin composition from which a molded article having excellent rigidity can be obtained. More specifically, the present invention relates to a crystalline polyolefin composition which is obtained by mixing a specific amount of a specific aromatic carboxylic acid compound and sodium lactate with a crystalline polyolefin to obtain a molded article having excellent rigidity.

[Prior Art] Generally, crystalline polyolefins are relatively inexpensive and have excellent mechanical properties, so that injection molded products, hollow molded products,
It is used in the production of various molded products such as films, sheets, and fibers. However, depending on various specific applications, the mechanical properties may not be sufficient, and there is a problem that expansion of the specific applications is limited. Above all, the rigidity is inferior to polyesters such as polystyrene, ABS resin, polyethylene terephthalate and polybutylene terephthalate, so that there is a drawback that the use of crystalline polyolefin is limited. For this reason, various nucleating agents have conventionally been used for the purpose of improving the rigidity of the crystalline polyolefin. In particular, aromatic carboxylic acids or metal salts thereof are relatively widely used because of their excellent effect of improving rigidity.

Further, an olefin polymer composition having improved optical properties obtained by blending a metal salt of a fatty acid and a metal salt of a carboxylic acid having an aromatic group with an olefin polymer (JP-A-47-34542), Rigidity obtained by blending at least one selected from the group consisting of aluminum salts of pt-butylbenzoic acid and metals of the first group of the periodic table or zinc of higher aliphatic carboxylic acids, and hydrotalcites with a propylene polymer. Propylene polymer compositions having significantly improved transparency (JP-A-62-263244 and JP-A-63-12)
No. 5551).

[Problems to be Solved by the Invention] However, when the aromatic carboxylic acid or its metal salt, sodium salt or aluminum salt is excellent in rigidity improving effect, but is used for applications requiring high rigidity, It is not yet satisfactory. JP-A-47-34542 discloses metal salts of hydroxy higher fatty acids such as ricinol and 12-oxystearic acid as metal salts of fatty acids.However, sodium lactate is not described at all, and fatty acids are not described. There is no description suggesting that the rigidity of a molded article obtained from an olefin polymer composition can be improved by using sodium lactate in combination with sodium aromatic carboxylate as a metal salt of. Further, in the propylene polymer compositions proposed in the above-mentioned JP-A-62-263244 and JP-A-63-125551, the first group metal of the periodic table of the higher aliphatic carboxylic acid was replaced with pt- Although the rigidity of the molded article obtained from the propylene polymer composition used in combination with the aluminum salt of butylbenzoic acid is improved, it is still not sufficiently satisfactory.

The present inventors have intensively studied to obtain a crystalline polyolefin composition which gives the above-mentioned problems relating to the crystalline polyolefin composition, that is, molded articles having improved rigidity.

As a result, the present inventors have obtained a crystalline polyolefin composition comprising a specific amount of a specific aromatic carboxylic acid compound and a specific amount of sodium lactate mixed with a crystalline polyolefin,
The present inventors have found that the composition provides a molded article with improved rigidity, and based on this finding, completed the present invention.

As is apparent from the above description, an object of the present invention is to provide a crystalline polyolefin composition having an improved rigidity when formed into a molded product.

[Means for Solving the Problems] The present invention has the following configurations.

(1) A crystal obtained by mixing 0.01 to 1 part by weight of one or two or more compounds selected from the following (hereinafter referred to as compound A) and sodium lactate with 100 parts by weight of a crystalline polyolefin. Polyolefin composition.

Aromatic monocarboxylic acid Metal salt of aromatic monocarboxylic acid (where metal represents potassium or aluminum) (2) Compound A or one or more selected from the following to 100 parts by weight of crystalline polyolefin Crystalline polyolefin composition comprising 0.01 to 1 part by weight of each of at least one compound (hereinafter, referred to as compound B), sodium lactate and an aliphatic amine.

Aromatic polycarboxylic acid Metal salt of aromatic polycarboxylic acid (where metal represents potassium or aluminum) (3) 0.01 to 25 parts by weight of an inorganic filler is further added to 100 parts by weight of a crystalline polyolefin. The crystalline polyolefin composition according to the above (1) or (2).

The crystalline polyolefin used in the present invention is ethylene,
Propylene, butene-1, pentene-1, 4-methyl-
Α- such as pentene-1, hexene-1, and octene-1
Crystalline homopolymer of olefin, two or more of these α-
Olefin crystalline or low crystalline random copolymer or crystalline block copolymer, copolymer of the above-mentioned α-olefin and vinyl acetate or acrylate, saponified product of the copolymer, these α-olefins And a copolymer of an unsaturated silane compound and a copolymer of the α-olefin and an unsaturated carboxylic acid or an anhydride thereof,
A reaction product of the copolymer and a metal ion compound, a crystalline homopolymer of the above-mentioned α-olefin, a crystalline or low-crystalline random copolymer or a crystalline block copolymer, and an unsaturated carboxylic acid or Examples include a modified polyolefin modified with a derivative, a crystalline homopolymer of the above-mentioned α-olefin, a crystalline or low-crystalline random copolymer, or a silane-modified polyolefin obtained by modifying a crystalline block copolymer with an unsaturated silane compound. These crystalline polyolefins can be used alone, or two or more crystalline polyolefins can be used in combination. In addition, various synthetic rubbers (for example, amorphous ethylene-propylene random copolymer, amorphous ethylene-propylene-nonconjugated diene terpolymer, polybutadiene, polyisoprene,
Polychloroprene, chlorinated polyethylene, chlorinated polypropylene, fluoro rubber, styrene-butadiene rubber,
Acrylonitrile-butadiene rubber, styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, styrene-ethylene-butylene-styrene block copolymer, styrene-propylene-butylene-styrene block copolymer, etc. )
Or a thermoplastic synthetic resin (for example, polystyrene, styrene-acrylonitrile copolymer, acrylonitrile-
Butadiene-styrene copolymer, polyamide, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyvinyl chloride, fluororesin, etc.) can also be used as a mixture. A crystalline propylene homopolymer, a crystalline propylene copolymer containing at least 70% by weight of a propylene component, and a crystalline ethylene-propylene random copolymer, a crystalline propylene-butene-1 random copolymer, and a crystalline propylene copolymer. Ethylene-propylene-butene-13 copolymer, crystalline propylene-hexene-butene-13 copolymer, and a mixture of two or more thereof are particularly preferably used.

Compound A used in the present invention includes benzoic acid, o-
Toluic acid, m-toluic acid, p-toluic acid, pt
-Butylbenzoic acid, pt-amylbenzoic acid, pt-
Aromatic monocarboxylic acids such as octylbenzoic acid, o-methoxybenzoic acid, m-methoxybenzoic acid, anisic acid, naphthoic acid, salicylic acid, acetylsalicylic acid and 3,5-di-t-butyl-4-hydroxybenzoic acid; Examples thereof include potassium salts and aluminum salts, with benzoic acid, pt-butylbenzoic acid, potassium benzoate, potassium pt-butylbenzoate, aluminum benzoate and pt-butyl aluminum benzoate being particularly preferred. . These compounds A may be used alone, or two or more compounds A may be used in combination. The compounding ratio of the compound A is 100 parts by weight of the crystalline polyolefin.
It is 0.01 to 1 part by weight, preferably 0.05 to 0.5 part by weight.
If the amount is less than 0.01 part by weight, the effect of improving the rigidity is not sufficiently exhibited, and even if the amount exceeds 1 part by weight, the effect of improving the rigidity cannot be expected any more, which is not only practical but also uneconomical. It is.

The mixing ratio of sodium lactate used in the present invention is 0.01 to 1 part by weight, preferably 0.05 to 0.5 part by weight, based on 100 parts by weight of the crystalline polyolefin. If the amount is less than 0.01 part by weight, the effect of improving the rigidity is not sufficiently exhibited, and even if the amount exceeds 1 part by weight, the effect of improving the rigidity cannot be expected any more, which is not only practical but also uneconomical. It is.

Examples of the compound B used in the present invention include aromatic polycarboxylic acids such as phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, pyromellitic acid and melitic acid, and potassium salts and aluminum salts thereof.
These compounds B may be used alone, or two or more compounds B may be used in combination. The compounding ratio of the compound B is 0.01 to 100 parts by weight of the crystalline polyolefin.
1 part by weight, preferably 0.05 to 0.5 part by weight. If the amount is less than 0.01 part by weight, the effect of improving the rigidity is not sufficiently exhibited, and the amount may be more than 1 part by weight. It is also uneconomical.

In the composition of the present invention, the combined use of an aliphatic amine synergistically exerts the effect of improving rigidity, so that the combined use is preferred. Aliphatic amines include octylamine, laurylamine, myristylamine, palmitylamine, stearylamine, oleylamine, cocoamine, tallowamine, soyamine, N, N-dicocoamine, N, N-ditaroamine, N, N-disoiamine, N-
Lauryl-N, N-dimethylamine, N-myristyl-N, N
-Dimethylamine, N-palmityl-N, N-dimethylamine, N-stearyl-N, N-dimethylamine, N-coco-N, N-dimethylamine, N-tallow-N, N-dimethylamine, N- Soy-N, N-dimethylamine, N-methyl-N, N-ditallowamine, N-methyl-N, N-dicocoamine, N-oleyl-1,3-diaminopropane, N-tallow-1,3-diaminopropane , Hexamethylenediamine, N-lauryl-N, N, N-trimethylammonium chloride, N-palmityl-N, N, N-trimethylammonium chloride, N-stearyl-N, N, N, N-trimethylammonium chloride, N-docosyl -N, N, N-trimethylammonium chloride, N-coco-N, N, N-
Trimethylammonium chloride-N-tallow-N, N,
N-trimethylammonium chloride, N-soy-N,
N, N-trimethylammonium chloride, N, N, N-triethyl-N-benzylammonium chloride, N-lauryl-N, N-dimethyl-N-benzylammonium chloride, N-myristyl-N, N-dimethyl-N- Benzyl ammonium chloride, N-stearyl-N, N-
Dimethyl-N-benzylammonium chloride, N-
Coco-N, N-dimethyl-N-benzylammonium chloride, N, N-dioleyl-N, N-dimethylammonium chloride, N, N-dicoco-N, N-dimethylammonium chloride, N, N-ditarow-N, N-dimethylammonium chloride, N, N-disoiy-N, N-dimethylammonium chloride, N, N-bis (2-hydroxyethyl)-
N-lauryl-N-methylammonium chloride, N,
N-bis (2-hydroxyethyl) -N-stearyl-
N-methylammonium chloride, N, N-bis (2-
(Hydroxyethyl) -N-oleyl-N-methylammonium chloride, N, N-bis (2-hydroxyethyl) -N-coco-N-methylammonium chloride,
N, N-bis (polyoxyethylene) -N-lauryl-N
-Methylammonium chloride, N, N-bis (polyoxyethylene) -N-stearyl-N-methylammonium chloride, N, N-bis (polyoxyethylene)-
N-oleyl-N-methylammonium chloride, N,
N-bis (polyoxyethylene) -N-coco-N-methylammonium chloride, N, N-bis (2-hydroxyethyl) laurylaminobetaine, N, N-bis (2-
Hydroxyethyl) tridecylaminobetaine, N, N-
Bis (2-hydroxyethyl) myristylaminobetaine, N, N-bis (2-hydroxyethyl) pentadecylaminobetaine, N, N-bis (2-hydroxyethyl)
Palmitylaminobetaine, N, N-bis (2-hydroxyethyl) stearylaminobetaine, N, N-bis (2
-Hydroxyethyl) oleylaminobetaine, N, N-
Bis (2-hydroxyethyl) docosylaminobetaine, N, N-bis (2-hydroxyethyl) octacosylaminobetaine, N, N-bis (2-hydroxyethyl)
Cocoaminobetaine, N, N-bis (2-hydroxyethyl) tallowaminobetaine, hexamethylenetetramine, triethanolamine, triisopropanolamine, N- (2-hydroxyethyl) laurylamine, N
-(2-hydroxyethyl) tridecylamine, N-
(2-hydroxyethyl) myristylamine, N- (2
-Hydroxyethyl) pentadecylamine, N- (2-
(Hydroxyethyl) palmitylamine, N- (2-hydroxyethyl) stearylamine, N- (2-hydroxyethyl) oleylamine, N- (2-hydroxyethyl) docosylamine, N- (2-hydroxyethyl) octacosylamine, N- (2-hydroxyethyl) cocoamine, N- (2-hydroxyethyl) tallowamine,
N-methyl-N- (2-hydroxyethyl) laurylamine, N-methyl-N- (2-hydroxyethyl) tridecylamine, N-methyl-N- (2-hydroxyethyl) myristylamine, N-methyl- N- (2-hydroxyethyl) pentadecylamine, N-methyl-N-
(2-hydroxyethyl) palmitylamine, N-methyl-N- (2-hydroxyethyl) stearylamine,
N-methyl-N- (2-hydroxyethyl) oleylamine, N-methyl-N- (2-hydroxyethyl) docosylamine, N-methyl-N- (2-hydroxyethyl) octacosylamine, N-methyl-N- (2-hydroxyethyl) cocoamine, N-methyl-N- (2-hydroxyethyl) tallowamine, N, N-bis (2-hydroxyethyl) laurylamine, N, N-bis (2-hydroxyethyl) tridecylamine , N, N-bis (2-hydroxyethyl) myristylamine, N, N-bis (2-
(Hydroxyethyl) pentadecylamine, N, N-bis (2-hydroxyethyl) palmitylamine, N, N-bis (2-hydroxyethyl) stearylamine, N, N-
Bis (2-hydroxyethyl) oleylamine, N, N-
Bis (2-hydroxyethyl) docosylamine, N, N-
Bis (2-hydroxyethyl) octacosylamine, N,
N, N- such as N-bis (2-hydroxyethyl) cocoamine and N, N-bis (2-hydroxyethyl) tallowamine
Bis (2-hydroxyethyl) aliphatic amine, the N, N-
Mono or diesters of bis (2-hydroxyethyl) aliphatic amines with fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, polyoxyethylene lauryl amino ether, polyoxyethylene stearyl amino ether, polyoxy Ethylene oleyl amino ether, polyoxyethylene coco amino ether, polyoxyethylene tallow amino ether, N, N, N ', N'-tetra (2-hydroxyethyl)-
1,3-diaminopropane, N, N, N ', N'-tetra (2-hydroxyethyl) -1,6-diaminohexane, N-lauryl-N, N', N'-tris (2-hydroxyethyl )-
1,3-diaminopropane, N-stearyl-N, N ', N'-
Tris (2-hydroxyethyl) -1,3-diaminopropane, N-coco-N, N ', N'-tris (2-hydroxyethyl) -1,3-diaminopropane, N-tallow-N,
N ', N'-tris (2-hydroxyethyl) -1,3-diaminopropane, N, N-dicoco-N', N'-bis (2-hydroxyethyl) -1,3-diaminopropane, N, N-ditarow-N ', N'-bis (2-hydroxyethyl) -1,3
Diaminopropane, N-coco-N, N ', N'-tris (2-hydroxyethyl) -1,6-diaminohexane,
N-tallow-N, N ', N'-tris (2-hydroxyethyl) -1,6-diaminohexane, N, N-dicoco-N', N '
-Bis (2-hydroxyethyl) -1,6-diaminohexane and N, N-ditarow-N ', N'-bis (2-hydroxyethyl) -1,6-diaminohexane; N-bis (2-hydroxyethyl) aliphatic amines are preferred. Of course, these aliphatic amines can be used alone, and two or more aliphatic amines can be used in combination. The proportion of the aliphatic amine is 0.01 to 1 part by weight, preferably 0.0 to 1 part by weight, per 100 parts by weight of the crystalline polyolefin.
5 to 0.5 parts by weight.

In the composition of the present invention, the combined use of an inorganic filler synergistically exhibits an effect of improving rigidity, so that the combined use is preferred. Talc, as an inorganic filler
Mica, clay, wollastonite, zeolite, kaolin, bentonite, perlite, diatomaceous earth, asbestos, calcium carbonate, aluminum hydroxide, magnesium hydroxide, silicon dioxide, titanium dioxide, zinc oxide,
Magnesium oxide, zinc sulfide, barium sulfate, calcium silicate, aluminum silicate, glass fiber, potassium titanate, carbon fiber, carbon black, graphite and metal fiber, etc., and coupling agents (eg, silane, titanate, boron) , Aluminate, zircoaluminate, etc.), and the above-mentioned inorganic filler which has been surface-treated with a surface-treating agent, such as talc, is particularly preferred. Of course, these inorganic fillers can be used alone, and two or more inorganic fillers can be used in combination. The mixing ratio of the inorganic filler is 0.01 to 25 parts by weight, preferably 0.1 to 20 parts by weight, and more preferably 1 to 15 parts by weight based on 100 parts by weight of the crystalline polyolefin.

In the composition of the present invention, various additives usually added to the crystalline polyolefin such as phenol-based, thioether-based, phosphorus-based antioxidants, light stabilizers, heavy metal deactivators, and clarifiers , Nucleating agent (however, compound A
And compound B), a lubricant, an antistatic agent, an antifogging agent,
Anti-blocking agent, no-drop agent, flame retardant, flame retardant auxiliary, pigment, radical generator such as peroxide, halogen scavenger (excluding compound B), dispersant or neutralizing agent such as metal soaps Alternatively, an organic filler (for example, wood flour, pulp, waste paper, synthetic fiber, natural fiber, etc.) can be used in combination as long as the object of the present invention is not impaired.

The composition of the present invention is prepared by adding a predetermined amount of each of the compound A or the compound B and sodium lactate to the crystalline polyolefin and the above-mentioned various additives which are usually added to the crystalline polyolefin in a usual mixing apparatus such as a Henschel mixer (trade name). Mixing using a super mixer, ribbon blender, Banbury mixer, etc., and using a usual single screw extruder, twin screw extruder, Brabender or roll, etc., the melt kneading temperature is 150 ° C to 300 ° C, preferably 180 ° C to 270 ° C.
It can be obtained by melt-kneading pelletizing at ° C. The obtained composition is used for production of a target molded article by various molding methods such as an injection molding method, an extrusion molding method, and a blow molding method.

[Action] In the present invention, it is generally known that compound A acts as a nucleating agent to improve the rigidity of crystalline polyolefin, and that sodium lactate acts as a halogen scavenger. However, in the present invention, compound A
The mechanism of action of the combination of sodium and sodium lactate is not clear, but is presumed to be due to the following mechanism of action. That is, when the compound A is an aromatic carboxylic acid, a coordination bond or an ionic bond is formed between the carbonyl group of the compound A and the sodium ion of sodium lactate. By forming a hydrogen bond between the carbonyl group and the carbonyl group of compound A and the hydroxyl group of sodium lactate, and when compound A is a potassium or aluminum salt of an aromatic carboxylic acid, Forming a coordination bond or ionic bond between the carbonyl group of sodium lactate and the carbonyl group of compound A and the sodium ion of sodium lactate; and forming a hydrogen bond between the carbonyl group of compound A and the sodium lactate hydroxyl group. By forming the compound A It believed to act to improve the rigidity synergistically improve nucleation activity having come.

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

The evaluation method used in the examples and comparative examples was based on the following method.

Rigidity: Evaluated by a bending test. In other words, a test piece having a length of 100 mm, a width of 10 mm, and a thickness of 4 mm was prepared by injection molding using the obtained pellets, and the flexural modulus was measured using the test piece (based on JIS K 7203). Was evaluated. A highly rigid material is one having a large flexural modulus.

Examples 1 to 8 and Comparative Examples 1 to 14 As a crystalline polyolefin, MFR (load at 230 ° C.)
2.16 kg of molten resin discharged for 10 minutes when added (6.0 g)
100 parts by weight of unstabilized powdered crystalline propylene homopolymer / 10 minutes, benzoic acid, potassium benzoate or pt-butyl aluminum benzoate, sodium lactate and other additives as compound A A predetermined amount is placed in a Henschel mixer (trade name) at the mixing ratio shown in Table 1 below, and the mixture is stirred and mixed for 3 minutes.
The mixture was melt-kneaded at 200 ° C. in a 40 mm single screw extruder to form pellets. Further, as Comparative Examples 1 to 14, the MFR was 6.0 g / 10 min and the unstabilized powdery crystalline propylene homopolymer 10
A predetermined amount of each of the additives described in Table 1 described below was blended into 0 parts by weight, and the mixture was melt-kneaded according to Examples 1 to 8 to obtain pellets.

A test piece used for evaluation of rigidity was prepared by injection molding the obtained pellet at a resin temperature of 250 ° C and a mold temperature of 50 ° C.

The rigidity was evaluated by the test method using the obtained test pieces. The results are shown in Table 1.

Examples 9 to 16 and Comparative Examples 15 to 28 As a crystalline polyolefin, 100 parts by weight of an unstabilized powdery crystalline ethylene-propylene block copolymer (ethylene content 8.5% by weight) with an MFR of 4.0 g / 10 minutes Pt-butylbenzoic acid, potassium salicylate or aluminum pt-octylbenzoate as compound A;
A predetermined amount of each of sodium lactate and other additives is added to a Henschel mixer (trade name) at a mixing ratio shown in Table 2 below, and the mixture is stirred and mixed for 3 minutes.
And melt-kneading at 200 ° C. with a single screw extruder to form pellets. In Comparative Examples 15 to 28, 100 parts by weight of an unstabilized powdery crystalline ethylene-propylene block copolymer (ethylene content: 8.5% by weight) having an MFR of 4.0 g / 10 minutes are shown in Table 2 below. A predetermined amount of each of the additives is blended,
Pellets were obtained by melt-kneading according to Examples 9 to 16.

A test piece used for evaluation of rigidity was prepared by injection molding the obtained pellet at a resin temperature of 250 ° C and a mold temperature of 50 ° C.

The rigidity was evaluated by using the obtained test pieces according to the test method described above. Table 2 shows the results.

Examples 17 to 24, Comparative Examples 29 to 42 100 parts by weight of an unstabilized powdery crystalline propylene homopolymer having an MFR of 8.0 g / 10 minutes as a crystalline polyolefin, anisic acid or aluminum anisate as compound A, A predetermined amount of each of potassium terephthalate, sodium lactate and other additives as a compound B was added to a Henschel mixer (trade name) at a mixing ratio shown in Table 3 below, and the mixture was stirred and mixed for 3 minutes. The mixture was melt-kneaded at 200 ° C. with a screw extruder to form pellets.
Further, as Comparative Examples 29 to 42, the MFR was mixed with a predetermined amount of each of the additives described in Table 3 described below in 100 parts by weight of an unstabilized powdery crystalline propylene homopolymer of 8.0 g / 10 minutes, Pellets were obtained by melt-kneading according to Examples 17 to 24.

A test piece used for evaluation of rigidity was prepared by injection molding the obtained pellet at a resin temperature of 250 ° C and a mold temperature of 50 ° C.

The rigidity was evaluated by using the obtained test pieces according to the test method described above. The results are shown in Table 3.

Examples 25-32, Comparative Examples 43-56 70% by weight of an unstabilized powdery crystalline ethylene-propylene random copolymer (ethylene content 2.5% by weight) of 7.0 g / 10 minutes MFR as a crystalline polyolefin and M
I (Discharge rate of molten resin for 10 minutes under a load of 2.16 kg at 190 ° C) 10 g / 10 minutes Unstabilized powdered Ziegler-Natta high-density ethylene homopolymer 30% by weight In 100 parts by weight, 3,5-di-
t-butyl-4-hydroxybenzoic acid or aluminum 3,5-di-t-butyl-4-hydroxybenzoate,
A prescribed amount of each of potassium pyromellitate, sodium lactate and other additives as a compound B was placed in a Henschel mixer (trade name) at a mixing ratio shown in Table 4 below, and stirred and mixed for 3 minutes. With screw extruder
The mixture was melt-kneaded at 200 ° C. and pelletized. As Comparative Examples 43 to 56, 70% by weight of an unstabilized powdery crystalline ethylene-propylene random copolymer (ethylene content: 2.5% by weight) having an MFR of 7.0 g / 10 minutes and MI of 10 g / 10 minutes were obtained. A predetermined amount of each of the additives listed in Table 4 described below was blended with a total of 100 parts by weight of 30% by weight of the unstabilized powdery Ziegler-Natta high-density ethylene homopolymer. Pellets were obtained by a melt-kneading treatment according to.

A test piece used for evaluation of rigidity was prepared by injection molding the obtained pellet at a resin temperature of 250 ° C and a mold temperature of 50 ° C.

The rigidity was evaluated by the test method using the obtained test pieces. The results are shown in Table 4.

The compounds and additives according to the present invention shown in Tables 1 to 4 are as follows.

Compound A [I]: benzoic acid Compound A [II]: p-t-butylbenzoic acid Compound A [III]: anisic acid Compound A [IV]: 3,5-di-t-butyl-4-hydroxybenzoic acid Compound A [V]: Potassium benzoate Compound A [VI]: Potassium salicylate Compound B [I]: Potassium terephthalate Compound B [II]: Potassium pyromellitate Compound A [IX]: Aluminum pt-butyl benzoate Compound A [X]: Aluminum pt-octylbenzoate Compound A [XI]: Aluminum anisate Compound A [XII]: Aluminum 3,5-di-t-butyl-4-hydroxybenzoate Sodium lactate Aliphatic amine 1 : Laurylamine aliphatic amine 2: N, N-dicocoamine aliphatic amine 3: N-stearyl-N, N-dimethylamine aliphatic amine 4: hexamethylenediamine aliphatic amine 5: N-tallow-1,3- Diaminopropane aliphatic amine 6: hexamethylenetetramine aliphatic amine 7: N-docosyl-N, N, N-trimethylammonium chloride aliphatic amine 8: N, N, N-triethyl-N-benzylammonium chloride aliphatic amine 9 : N, N-bis (2-hydroxyethyl)-
N-oleyl-N-methylammonium chloride aliphatic amine 10: N, N-bis (2-hydroxyethyl) stearylaminobetaine aliphatic amine 11: triisopropanolamine aliphatic amine 12: N, N-bis (2-hydroxy Ethyl) cocoamine aliphatic amine 13: N, N-bis (2-hydroxyethyl) tallowamine aliphatic amine 14: octadecanoic acid 2-[(2-hydroxyethyl) octadecylamino] ethyl ester aliphatic amine 15: (octadecyl imino) Diethylene distearate aliphatic amine 16: polyoxyethylene lauryl Aliphatic amine 17: polyoxyethylene stearyl Aliphatic amine 18: N, N, N ', N'-tetra (2-hydroxyethyl) -1,3-diaminopropane Aliphatic amine 19: N-tallow-N, N', N'-tris (2-
(Hydroxyethyl) -1,3-diaminopropane aliphatic amine 20: N, N-dicoco-N ', N'-bis (2-hydroxyethyl) -1,6-diaminohexane inorganic filler 1: talc inorganic filler 2: Calcium carbonate inorganic filler 3: barium sulfate phenolic antioxidant 1: 2,6-di-t-butyl-p-
Cresol phenolic antioxidant 2: tetrakis [methylene-3-
(3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane phenolic antioxidant 3: 1,3,5-trimethyl-2,4,6-
Tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene phenolic antioxidant 4: 1,3,5-tris (3,5-di-t
-Butyl-4-hydroxybenzyl) isocyanurate phenolic antioxidant 5: 3,9-bis [1,1-dimethyl-
2- {β- (3-t-butyl-4-hydroxy-5-methylphenyl) propionyloxy} ethyl] -2,4,8,
10-tetraoxaspiro [5.5] undecane thioether antioxidant 1: dimyristyl thiodipropionate thioether antioxidant 2: distearyl thiodipropionate thioether antioxidant 3: pentaerythritol-tetrakis (3-lauryl) Thiopropionate) Phosphorus antioxidant 1: bis (2,4-di-t-butylphenyl) -pentaerythritol-diphosphite Phosphorus antioxidant 2: bis (2,6-di-t-butyl) -4-
Methylphenyl) -pentaerythritol-diphosphite phosphorus antioxidant 3: tetrakis (2,4-di-t-butylphenyl) -4,4'-biphenylene-diphosphonite phosphorus antioxidant 4: Tris (2,4-di-t-butylphenyl) phosphite Metal salt of aliphatic carboxylic acid 1: Sodium stearate Metal salt of fatty acid 2: Calcium stearate Metal salt of fatty acid 3: Zinc stearate Hydrotalcite : Mg _4.5 Al ₂ (OH) ₁₃ CO ₃ · 3.5H ₂ O [DHT-4A manufactured by Kyowa Chemical Industry Co., Ltd.] Hydroxy acid compound 1: lactic acid hydroxy acid compound 2: lithium lactate hydroxy acid compound 3: magnesium lactate hydroxy acid Compound 4: Calcium lactate Hydroxy acid compound 5: Zinc lactate Hydroxy acid compound 6: Sodium tartrate Hydroxy acid compound 7: Sodium citrate The examples and comparative examples described in Table 1 are cases where a crystalline propylene homopolymer is used as the crystalline polyolefin. As can be seen from Table 1, Examples 1 to 8 were obtained by blending Compound A and sodium lactate with a crystalline propylene homopolymer. Examples 1 to 8 and Comparative Example 1
In comparison with (compound A and sodium lactate), Examples 1 to 8 have remarkably excellent rigidity. When comparing Comparative Example 2 with Examples 1 to 8 in which compound A is blended and sodium lactate is not blended,
Although the rigidity of Comparative Example 2 is considerably improved as compared with Comparative Example 1, it is still insufficient. When comparing Comparative Example 3 in which sodium lactate is added and Compound A is not added and Examples 1 to 8, the rigidity of Comparative Example 3 is improved to some extent as compared with Comparative Example 1, but is still not sufficient. Further, Comparative Examples 4 to 14 and Examples 1 to 8 in which instead of sodium lactate of Examples 1 to 8, metal salts of aliphatic carboxylic acids 1 to 4 and hydroxy acid compounds 1 to 7 other than hydrotalcite or sodium lactate were blended. Comparative Example 4
Has a higher rigidity than that of Comparative Example 2
Is improved by the combination of Comparative Example 2 but is still not sufficient, and the stiffness of Comparative Examples 5 to 14 is comparable to Comparative Example 2 and is not yet sufficient. Therefore, it is clear that Comparative Examples which do not simultaneously satisfy the compounding of the two components of the compound A and sodium lactate according to the present invention do not exhibit the effects of the present invention. That is, it can be said that the rigidity obtained in the present invention is a unique effect that can be seen only when compound A and sodium lactate are blended with the crystalline polyolefin. In addition, in the compositions of Examples 1 to 3, Examples 4 to 8 in which various aliphatic amines were used in combination showed that the excellent rigidity improving effect of Compound A and sodium lactate was inhibited as compared with Examples 1 to 3. No significant synergistic effect due to the combined use of the aliphatic amine is found.

Tables 2 to 4 show the crystalline polyolefin as a crystalline ethylene-propylene block copolymer, a crystalline propylene homopolymer or a crystalline ethylene-propylene random copolymer, and a Tiller-Natta-based high-density ethylene single polymer, respectively. A combined mixture was used, and the same effects as described above were confirmed for these.

[Effect of the Invention] The composition of the present invention (1) when formed into a molded article, has extremely excellent rigidity. (2) Not only can the molded product be made thinner, which contributes to resource saving, but also the cooling rate during molding becomes faster, so that the molding speed per unit time can be increased, contributing to improved productivity. it can.

Claims (3)

(57) [Claims] 1 to 100 parts by weight of a crystalline polyolefin, 0.01 to 1 part by weight of one or more compounds selected from the following (hereinafter referred to as compound A) and sodium lactate: A crystalline polyolefin composition. Aromatic monocarboxylic acid Metal salt of aromatic monocarboxylic acid (however, metal indicates potassium or aluminum) 2. Compound A or one or more compounds selected from the following (hereinafter, referred to as compound B), sodium lactate and an aliphatic amine in an amount of 0.01 to 100 parts by weight of the crystalline polyolefin. A crystalline polyolefin composition containing 1 part by weight. Aromatic polycarboxylic acid Metal salt of aromatic polycarboxylic acid (however, the metal indicates potassium or aluminum) 3. The crystalline polyolefin composition according to claim 1, further comprising 0.01 to 25 parts by weight of an inorganic filler based on 100 parts by weight of the crystalline polyolefin.