JPH05209094A - Propylene polymer composition containing talc - Google Patents

Abstract

PURPOSE:To obtain the subject composition excellent in the balance between the rigidity and the impact resistance and free from contamination of metal molds by incorporating a specified talc and a specified fatty acid ester each in a specified amount into a crystalline propylene polymer. CONSTITUTION:100 pts.wt. crystalline propylene polymer (A) (e.g. propylene/ ethylene block copolymer) is mixed with 3-100 pts.wt. talc (B) having a specific surface of at least 37,000cm<2>/g, a length of at most 15mum, a mean particle diameter of 0.8-5mum and a mean aspect ratio of at least 5 and compounds (C) of formula I and/or formula II [wherein R is a 4-29C hydrocarbon group which may contain hydroxyl group(s); and R1 and R2 are each a 1-8C hydrocarbon group, H, hydroxyl or RCOO] in an amount of 0.1-10wt.% based on the weight of component B to give the objective composition. This composition is suitably used for the manufacture of an automobile bumper, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition suitable for a molding material, in which the balance between rigidity and impact resistance is improved, and mold contamination is suppressed.

[0002]

2. Description of the Related Art Propylene polymers containing talc are
Utilizing its excellent mechanical strength, heat resistance, molding processability, etc., it is widely used for various purposes mainly in industrial parts such as automobiles. On the other hand, with the recent widespread use, the demand for mechanical strength is increasing. In particular,
There are extremely high demands for the balance between the contradictory properties of rigidity and impact strength. Therefore, various attempts have been made in the past. For example, studies have been conducted to improve impact strength by atomizing talc, improve impact strength by blending an ethylene-propylene copolymer rubber component, and improve impact strength by adding a dispersant such as a metal salt or wax. However, atomization of talc reduces impact strength due to secondary agglomeration, not only increases the cost of compounding rubber components, but also decreases rigidity, adding existing dispersants causes problems such as mold contamination. Development of more effective methods that we have is a very important issue.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a talc-containing propylene polymer composition having a high balance of rigidity and impact resistance, and suppressing mold contamination.

[0004]

The present inventors have completed the present invention by finding that the above object can be achieved only by combining a specific talc and a dispersant together with a propylene polymer.

That is, the present invention relates to a crystalline propylene polymer
100 parts by weight, specific surface area 37,000 cm²/ G or less
In addition, the length is substantially 15 μm or less, and the average particle size is 0.8 to
Talc 3 to 10 with an average aspect ratio of 5 or more and 5 μm
0 parts by weight, and in the following (formula 1) and / or (formula 2)
A compound represented by the formula (wherein R is a C 4 -C 29 hydro).
Different from each other in a hydrocarbon group which may contain a xyl group
It is an acceptable group. R ₁Is a hydrocarbon having 1 to 8 carbon atoms
Group, hydrogen atom, hydroxyl group, RCOO-
It is a group which may be different from each other. R₂Has 1 to 8 carbon atoms
Hydrocarbon group, hydrogen atom, hydroxyl group, RCOO-
Is a group selected more preferably from each other,
At least one contains RCOO- and a hydroxyl group
Is 1 in the compound even if it is included. ) To the amount of talc
On the other hand, 0.1 to 10% by weight,
A talc-containing propylene polymer composition.

[Chemical 2]

The present invention will be described in detail below. The crystalline propylene polymer used in the present invention is a homopolymer of propylene, a main weight ratio of propylene and a sub-weight ratio of other α-.
Olefin (for example, ethylene, 1-butene, 1-pentene, 1-hexene, 4-methylpentene-1,1-octene, etc.), vinyl ester (for example, vinyl acetate, vinyl butyrate, etc.), unsaturated carboxylic acid or its Examples thereof include copolymers such as block copolymers, random copolymers and graft copolymers with derivatives (for example, acrylic acid or its ester, maleic anhydride, etc.) and unsaturated aromatic compounds (for example, styrene, α-methylstyrene, etc.).

Specific preferred examples include polypropylene, propylene-ethylene block or random copolymer, propylene-ethylene-butene copolymer, and the like.
Of these, a propylene-ethylene block copolymer is preferable.

MFR of this polymer (JIS-K721
0, 230 ℃, 2.16kg) is 0.1-100g / 1
0 minutes, particularly preferably 1 to 50 g / 10 minutes.

These propylene polymers are usually produced with a Ziegler-Natta catalyst, but a catalyst obtained by supporting a catalyst component on a carrier such as magnesium chloride can also be used for this catalyst. The polymerization method may be a slurry method of polymerization in a solvent, a liquid phase method of polymerization in a liquid of propylene monomer, or a gas phase polymerization method.

The talc used in the present invention has a specific surface area of 3
Talc is 7,000 cm ² / g or more, the length is substantially 15 μm or less, the average particle size is 0.8 to 5 μm, and the average aspect ratio is 5 or more. Above all, the specific surface area is 40,000
Talc having 0 cm ² / g or more, a length of substantially 10 μm or less, an average particle size of 0.8 to 4 μm and an average aspect ratio of 6 or more is preferable. Here, “substantially” means that talc having a length other than the specified length may be included so long as the effect of the invention is not significantly impaired.

Talc whose specific surface area, length and average aspect ratio are out of the above ranges and whose average particle size exceeds the above range,
A high degree of balance between rigidity and impact resistance of the composition is not achieved. Further, talc having an average particle size of less than the above range has a drawback of poor impact resistance due to poor dispersion. The talc used in the present invention is obtained by crushing rough talc (preferably produced in China with less metal impurity components) by, for example, an impact type crusher or a micron mill type pulverizer, and further finely pulverized by a micron mill or jet mill type pulverizer. After that, it is manufactured by classifying and adjusting it with a cyclone or micron separator.

The particle size of talc is a value using a laser light scattering type particle size distribution meter, and as a measuring device, for example, LA-500 manufactured by Horiba Ltd. is desirable because of its excellent measuring accuracy.
The specific surface area is measured by the air permeation method, and a measuring device is, for example, model SS-100 manufactured by Shimadzu Corporation.
The length and aspect ratio are measured by a microscope method or the like.

The compounds represented by (Formula 1) and (Formula 2) used in the present invention are trimethylolpropane triester, trimethylolpropane diester, pentaerythritol tetraester, pentaerythritol triester, pentaerythritol diester, glycerin triester. Examples include esters, glycerin diesters, propylene glycol diesters, propylene glycol monoesters, and the like.

Specifically, trimethylolpropane tricaplate, trimethylolpropane trilaurate,
Trimethylol propane trimyristate, trimethylol propane tripalmitate, trimethylol propane tristearate, trimethylol propane tribehenate, trimethylol propane trimimontanate, trimethylol propane trioleate, trimethylol propane dicaplate, trimethylol propane Propane dilaurate, trimethylolpropane dimyristate, trimethylolpropane dipalmitate, trimethylolpropane distearate, trimethylolpropane dibehenate, trimethylolpropane dimontanate, pentaerythritol tetraheptate, pentaerythritol tetracaprate, Pentaerythritol tetralaurate, pentaerythritol tetramyristate,
Pentaerythritol tetrapalmitate, pentaerythritol tetrastearate, pentaerythritol tetrabehenate, pentaerythritol tetramontanate, pentaerythritol tetraoleate, pentaerythritol tricaprate, pentaerythritol trilaurate, pentaerythritol trimyristate, pentaerythritol Tripalmitate, pentaerythritol tristearate, pentaerythritol tribehenate, pentaerythritol trimontanate, pentaerythritol dicaprate, pentaerythritol dilaurate, pentaerythritol dimyristate, pentaerythritol dipalmitate, pentaerythritol distearate, Pentaerythritol dibehenate, Ntaerythritol dimontanate, glycerin trilaurate, glycerin trimyristate, glycerin tripalmitate, glycerin tristearate, glycerin tribehenate, glycerin trimytantanate, glycerin dilaurate, glycerin dimyristate, glycerin dipalmitate, Glycerin distearate, glycerin dibehenate, glycerin dimontanate, propylene glycol dilaurate, propylene glycol dimyristate, propylene glycol dipalmitate, propylene glycol distearate, propylene glycol dibehenate, propylene glycol dimontanate, propylene Glycol monolaurate, propylene glycol monomyristate, propylene glycol monopal Tate, propylene glycol monostearate, propylene glycol monobehenate, propylene glycol monomontanate, and the like.

Of these, preferred are trimethylolpropane tristearate, trimethylolpropane tribehenate, pentaerythritol tetraheptate, pentaerythritol tetracaprate, pentaerythritol tetralaurate, pentaerythritol tetramyristate, Pentaerythritol tetrapalmitate, pentaerythritol tetrastearate,
Pentaerythritol tetrabehenate, pentaerythritol tetramontanate, pentaerythritol tetraoleate, pentaerythritol tristearate, pentaerythritol tribehenate, pentaerythritol trimontanate, pentaerythritol distearate, pentaerythritol dibehenate, Glycerin trilaurate, glycerin trimyristate, glycerin tripalmitate, glycerin tristearate, glycerin tribehenate, glycerin trimontanate, glycerin distearate, glycerin dibehenate, propylene glycol monostearate, propylene glycol monobeate Henate, particularly preferably pentaerythritol tetraheptate,
Pentaerythritol tetracaprate, pentaerythritol tetralaurate, pentaerythritol tetramyristate, pentaerythritol tetrapalmitate, pentaerythritol tetrastearate, pentaerythritol tetrabehenate, pentaerythritol tetramontanate, pentaerythritol tetraoleate, glycerin Examples are trilaurate, glycerin trimyristate, glycerin tripalmitate, glycerin tristearate, glycerin tribehenate, and glycerin trimontanate.

The mixing ratio of each of the above essential components is 3 to 100 parts by weight, preferably 5 to 50 parts by weight, and (formula 1) and / or (formula 2) per 100 parts by weight of the crystalline propylene polymer. ) 0.1 to 10% by weight, preferably 0.3 to 8% by weight, based on the amount of talc of the compound.

If the amount of talc is too small, the rigidity will be insufficient,
On the other hand, if the amount is too large, it is not preferable in terms of impact resistance and moldability. Further, if the amount of the compound represented by (Formula 1) or (Formula 2) is too small, the effect of impact resistance is not exhibited, while if it is too large, the rigidity is insufficient and the effect of suppressing die contamination is not exhibited.

In addition to these essential components, other additional components can be added within a range that does not significantly impair the effects of the present invention. For example, ethylene-propylene rubber,
Ethylene-butene rubber, low density polyethylene, medium and high density polyethylene, linear low density polyethylene, ultra low density polyethylene, styrene-butadiene-styrene rubber or hydrogenated product thereof, styrene-ethylene-butadiene-styrene rubber or The hydrogenated product and the like are good examples. Further, addition of a pigment is preferable in terms of improving commercial value. Specifically, as an organic pigment, a condensed azo pigment,
Isoindolinone-based, quinacridone-based, perinone-based, perylene-based, quinophthalone-based, anthraquinone-based, phthalocyanine-based, inorganic pigments include titanium oxide, titanium yellow, zinc white, iron black, carbon, rouge, ultramarine blue, etc. .. In addition, the following may be mentioned as examples of other additional components. That is, hindered phenol type,
Sulfur-based, phosphorus-based antioxidants, hindered amine-based, triazole-based, benzophenone-based, benzoate-based, nickel-based salicylic acid-based light stabilizers, antistatic agents, lubricants, peroxides, metal deactivators, organic And inorganic nucleating agents, antibacterial agents, optical brighteners, fillers other than essential components, for example, mica, glass fiber, barium sulfate, calcium carbonate, potassium titanate, inorganic such as nylon fiber,
Organic fillers are a good example.

The composition of the present invention can be manufactured by a conventional method. For example, a powdery propylene polymer is charged with the other two essential components of the present invention and, if necessary, other additional components, blended with a Henschel mixer, and then melted with a uniaxial or biaxial kneading extruder. Knead into pellets. The pellets are processed by an injection molding machine or the like to obtain a desired molded product. The compound components of (Formula 1) and / or (Formula 2) can be more effectively exhibited by mixing them in advance with the talc component using a Henschel mixer or the like.

[0020]

【Example】

Examples 1 to 9 and Comparative Examples 1 to 5 MFR 10 g / 10 minutes, 100 parts by weight of a propylene-ethylene block copolymer having an ethylene content of 3% by weight, a specific surface area of 41,000 cm ² / g and a length of less than 10 μm 9
8.2% and 15% or less portion 100%, average particle size 3.
8 μm, talc having an average aspect ratio of 6 and a compound represented by the formula (1) or (formula 2) represented by the following abbreviations were added in a compounding amount shown in Table 1, and after mixing with a Henschel mixer, 30 m
The mixture was kneaded into pellets at 230 ° C. with an m-diameter extruder.
The pellets were molded by an injection molding machine at 240 ° C. to mold a test piece having a length of 80 mm, a width of 10 mm and a thickness of 4 mm. Bending elastic modulus (JIS-K720
3) was measured. Also, length 120mm, width 80m
A m-thick sheet having a thickness of 20 mm was injection-molded under the same conditions, and a dart having a diameter of 20 mm was dropped on the sheet to measure the impact energy (DIT) required for breaking.

Continuous injection molding was carried out at a temperature of 220 ° C. at a filling rate of about 50% of the basis weight of the injection-molded article, and the number of shots was observed until the contamination of the mold was visible at the end of the filled resin. The larger this value is, the better the effect of suppressing die contamination is.

Compound of Formula 1 used in the present invention TTO: trimethylolpropane trioleate PDS: pentaerythritol distearate PTS: pentaerythritol tetrastearate PTB: pentaerythritol tetrabehenate

Compound of formula (2) used in the present invention GTS: Glycerine tristearate PMS: Propylene glycol monostearate Other compounds PMC: Pentaerythritol monocaprate GMS: Glycerine monostearate TMM: Trimethylolpropane monomontanate

As a stabilizer, tetrakis [methylene-3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane (IR101
0) and tris (2,4-di-t-butylphenyl) phosphite (IR168), respectively.
8 and the compositions of Comparative Examples 1 and 3 to 5 were 0.11 each.
Parts by weight (based on 100 parts by weight of the propylene polymer), and 0.1 and 0.1 in Example 9 and Comparative Example 2, respectively.
Three parts by weight (to the same parts by weight) were added and molded. The evaluation results are shown in Tables 1 and 2.

Comparative Examples 6 to 8 Talc had a specific surface area of 28,600 cm ² / g and a length of 1
The evaluation was performed in the same manner as in the above example, instead of talc having a portion exceeding 5 μm of 34%, an average particle diameter of 12 μm, and an average aspect ratio of 4. IR1010 and IR16 as stabilizers
8 was added in an amount of 0.11 parts by weight (based on 100 parts by weight of the propylene polymer) and molded. The evaluation results are shown in Tables 1 and 2.

[0026]

[Table 1]

[0027]

[Table 2]

[0028]

INDUSTRIAL APPLICABILITY The present invention provides a remarkable effect that the balance between rigidity and impact resistance is improved by using the specified talc and compound, and mold contamination is suppressed. .. The effect of the present invention is particularly exerted effectively in an injection molded product, and specific examples of the molded product include interior and exterior parts of automobile bumpers, instrument panels and the like, home appliances. Parts for refrigerators, high-rigidity containers, food containers for microwave ovens,
Examples include injection molded products such as margarine and butter containers.

Claims (1)

[Claims] 1. A crystalline propylene polymer 100 parts by weight,
Specific surface area of 37.000 cm²/ G or more, substantial length
15 μm or less, average particle size 0.8 to 5 μm, and average diameter
3 to 100 parts by weight of talc having a spectrum ratio of 5 or more, and
A compound represented by the following (Formula 1) and / or (Formula 2)
(Here, R contains a hydroxyl group having 4 to 29 carbon atoms.
A hydrocarbon group which may be a group which may be different from each other
is there. R ₁Is a hydrocarbon group having 1 to 8 carbon atoms, a hydrogen atom,
Selected from a droxyl group and RCOO--
Is a good group. R₂Is a hydrocarbon group having 1 to 8 carbon atoms, water
Different from each other selected from elementary atom, hydroxyl group, RCOO-
At least one of which is RC
Includes OO- and hydroxyl group
It is 1 in the compound. ) 0.1 to 1 with respect to the amount of talc
Talc-containing propyiate characterized by comprising 0% by weight
Len polymer composition. [Chemical 1]