JP3338248B2 - Polypropylene resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polypropylene resin composition, and more particularly to a polypropylene resin composition having excellent weather resistance and capable of preventing fogging occurring on the inner surface of glass, and suitable for automobile interiors.

[0002]

2. Description of the Related Art Polypropylene is widely used in various fields because of its light weight and excellent mechanical strength. However, because of poor impact resistance, various polypropylene resin compositions to which an inorganic filler such as talc is added have been proposed.

Japanese Patent Application Laid-Open No. 1-149845 discloses that (a) a method of preparing a boiling xylene-soluble component having an ethylene content of 20 to 60% by weight;
And the ethylene content of the whole polymer is 1 to 7%.
% By weight and the melt flow rate is 15 to 50 g / 10
Minute propylene-ethylene block copolymer 59-74
(B) a propylene content of 20 to 60% by weight and a Mooney viscosity ML _{1 + 4} (100 ° C.) of 100 to 150%
35 to 20% by weight of ethylene-propylene copolymer rubber of (c) 3 to 6% by weight of talc having a specific surface area of 30,000 cm ² / g or more and an average particle size of 0.5 to 2.0 μm. A resin composition characterized by the following:

This resin composition contains fine talc having an average particle size of 1.0 μm or less as talc.
Fine talc easily forms aggregates, and when aggregates are formed, the balance between hardness, rigidity, and mechanical strength such as impact resistance at low temperatures is deteriorated. In addition, when the specific surface area of talc is increased by using fine talc, the talc-collecting effect (adsorption property) is increased, so that there is a problem that talc adsorbs various additives. Therefore, by performing surface treatment on talc with an aminosilane-based treating agent or a titanate-based treating agent, the dispersibility of fine talc is improved, and the adsorption of additives is suppressed. However, there is still a problem that it does not have a sufficient effect.

[0005] Further, when a polypropylene resin is used particularly for interior materials of automobiles, it is required to have not only mechanical properties such as impact resistance, but also moldability and weather resistance. Therefore, a lubricant, an antioxidant, an ultraviolet absorber, a neutralizing agent for a catalyst, and the like are added to the polypropylene resin. However, when such an additive is used in the resin composition, there is a problem that a part of the additive is volatilized and fogging occurs on the inner surface of the glass of the automobile.

Accordingly, it is an object of the present invention to provide a polypropylene resin composition which is excellent in weather resistance, can prevent fogging occurring on the inner surface of glass, and is suitable for automobile interiors.

[0007]

As a result of intensive studies in view of the above-mentioned objects, the present inventors have found that a specific homopolypropylene or propylene-ethylene block copolymer is blended with polyethylene, an inorganic filler and a specific weathering agent. As a result, it has been found that a polypropylene resin composition having excellent weather resistance and preventing fogging occurring on the inner surface of the glass and suitable for automobile interior can be obtained, and have reached the present invention.

That is, the polypropylene resin composition of the present invention comprises: (a) 50 to 99.5 parts by weight of a propylene polymer containing a homopolypropylene portion of 75% by weight or more;
(b) 0.5 to 50 parts by weight of a polyethylene having a melt index of 0.5 to 50 g / 10 minutes, and (c) 0 to 50 parts by weight of an inorganic filler, and the above (a) to (c)
(D) 0.01 to 1 part by weight of a phenolic antioxidant having a molecular weight of 500 or more and (e) a hindered amine light stabilizer having a molecular weight of 700 or more based on 100 parts by weight of
-1 part by weight.

[0009]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below. [1] Each component of the polypropylene resin composition [A] Propylene polymer The propylene polymer used in the present invention contains at least 75% by weight of a homopolypropylene portion, and is a homopolypropylene or a propylene-ethylene block copolymer. Is preferred.

[0010] Melt flow rate of the homopolypropylene portion (MFR, measured at 230 ° C under a load of 2.16 kg)
Is preferably 0.1 to 200 g / 10 min, and
g / 10 minutes is more preferred. If the MFR is less than 0.1 g / 10 minutes, the moldability of the obtained composition is low, while
If the time exceeds / 10 minutes, the mechanical strength decreases.

(1) Homopolypropylene The homopolypropylene used in the present invention is particularly preferably an ultrahigh stereoregularity homopolypropylene.

(A) Physical properties of ultrahigh stereoregularity homopolypropylene Ultrahigh stereoregularity homopolypropylene has the following formula (1) from the triad fraction obtained by ¹³ C-NMR: Nm = 2 [mm] / [mr ] +1 (1) (where [mm] is the number of isotactic triads with respect to the total number of triads, and [mr] is the number of heterotactic triads with respect to the total number of triads). The length Nm is
(2): Nm> 250 + 29.5 log MFR (2) is satisfied. Nm ≦ 250 + 29.5 logM
In the case of FR, the mechanical strength is low.

(B) Method for producing ultrahigh stereoregularity homopolypropylene Ultrahigh stereoregularity polypropylene is, for example, a polypropylene obtained by polymerizing propylene at 60 ° C. or lower in the presence of the following specific catalyst. Can be obtained by a hot heptane extraction treatment.

(A) Production catalyst The catalyst is composed of the following three components (A), (B) and (C). (A) A component formed by contacting a solid catalyst component containing magnesium, titanium, a halogen and an electron donating compound as essential components with propylene in the presence of a trialkylaluminum and an organosilicon compound. (B) an organoaluminum compound. (C) General formula: (R ¹ O) R ² Si (OCH ₃ ) ₂ (where R ¹ is a hydrocarbon group having 1 to 10 carbon atoms,
R ² is a hydrocarbon group having a secondary or tertiary carbon having 2 to 10 carbon atoms (including a cyclic hydrocarbon group). An organosilicon compound represented by the formula:

The details of the catalyst components (A), (B) and (C) are described in JP-A-7-118323.

The amount of component (B) used relative to component (A) is 1 to 2,000 gmol, preferably 20 to 500 gmol, per gram atom of titanium of component (A).
The amount of component (C) used per mole of component (B) is 0.0
The amount is from 01 to 10 mol, preferably from 0.01 to 1.0 mol.

(Ii) Polymerization conditions The polymerization reaction of propylene may be either gas phase or liquid phase. When polymerizing in the liquid phase, normal butane, isobutane, normal pentane, isopentane, hexane, heptane, octane, cyclohexane, It can be carried out in an inert hydrocarbon solvent such as benzene, toluene, xylene or in a liquid monomer.

The polymerization temperature is 60 ° C. or less, preferably from 0 to 6
The temperature is in the range of 0 ° C., and the polymerization pressure may be, for example, 1 to 60 atm. Also, the molecular weight of the resulting polymer can be adjusted by the presence of hydrogen or other known molecular weight regulators. The polymerization reaction is carried out by a continuous or batch reaction, and the conditions may be ordinary ones. Further, the polymerization reaction may be performed in one stage or in multiple stages.

(2) Propylene-ethylene block copolymer (a) Structure and physical properties The propylene-ethylene block copolymer is composed of a substantially crystalline homopolypropylene portion, a propylene-ethylene copolymer portion, and a small amount of crystalline. It consists of homopolyethylene moieties, each of which may be present as a single polymer or in a state in which they are combined. Each of the above-mentioned parts is basically composed of propylene and / or ethylene, but may contain a small amount of other α-olefin, diene-based monomer or the like.

With respect to the content of each part, the sum of + is 100% by weight, and the crystalline homopolypropylene part is 75 to 98% by weight, preferably 85 to 96% by weight. The propylene-ethylene copolymer portion is 2 to 25.
%, Preferably 4 to 15% by weight. In addition, even if it contains a crystalline homopolyethylene part, the content is 3% by weight or less. The content of the propylene-ethylene copolymer portion can be determined by measuring the ratio of the portion soluble in cold xylene.

The propylene-ethylene copolymer portion has an ethylene content of 30 to 70% by weight, preferably 35 to 70% by weight.
65% by weight. If the ethylene content is less than 30% by weight or exceeds 70% by weight, the ductility is particularly reduced.
The intrinsic viscosity of the propylene-ethylene copolymer part [η]
Is 2 to 6 dl / g, preferably 3 to 5 dl / g.
If the intrinsic viscosity is less than 2 dl / g, the effect of improving impact resistance is not sufficient, while if it exceeds 6 dl / g, moldability and impact resistance are reduced.

In particular, by using a propylene-ethylene block copolymer having a homopolypropylene portion having the above-mentioned super-high stereoregularity, mechanical strength such as impact resistance can be further improved.

(B) Production Method The propylene-ethylene block copolymer is preferably synthesized by multi-stage polymerization.

In the multistage polymerization, propylene is first polymerized in the presence of a Ziegler catalyst or the like to produce a crystalline homopolypropylene portion (which may contain a small amount of a comonomer component). (Propylene) to produce a propylene-ethylene copolymerized portion. A propylene-ethylene block copolymer having an ultrahigh stereoregularity homopolypropylene moiety is firstly
(1) (b) It is obtained by polymerizing propylene by the method described in the method for producing ultrahigh stereoregularity homopolypropylene and producing a propylene-ethylene copolymer part in the next step.

[B] Polyethylene Melt index of polyethylene (MI, 190 ° C.,
(Measured at 2.16 kg) is preferably 0.5 to 50 g / 10 min, more preferably 0.5 to 30 g / 10 min. Examples of such polyethylene include linear low density polyethylene, high density polyethylene, low density polyethylene and the like.

The linear low-density polyethylene is a linear copolymer of ethylene and an α-olefin having 4 to 8 carbon atoms. Examples of the α-olefin include 4-methylpentene, 1-butene, 1-hexene and the like. The content of ethylene in the linear low density polyethylene is 9
It is preferably at least 0 mol%, more preferably at least 95 mol%. Such a linear low density polyethylene usually has a density of 0.910 to 0.940 g / cm ³ , preferably 0.910 to 0.930 g / cm ³ .

The high-density polyethylene has a density of 0.940.
g / cm ³ or more, preferably 0.945 to 0.960 g
/ Cm ³ is a polymer having a repeating unit derived from ethylene as a main polymerization component. High-density polyethylene can be obtained, for example, by polymerizing ethylene by a low-pressure method in the presence of a Ziegler catalyst.

Low density polyethylene has a density of 0.935.
g / cm ³ or less, preferably 0.91 to 0.93 g / c
It is a polymer having a repeating unit derived from ethylene of m ³ or less as a main polymerization component. Low-density polyethylene is, for example, ethylene in the presence of Ziegler catalyst,
It can be obtained by polymerizing by a high pressure method.

[C] Inorganic filler The impact resistance can be further improved by adding an inorganic filler to the above-mentioned propylene polymer and polyethylene.

The inorganic filler is generally used as a filler or reinforcing material such as resin, and examples thereof include talc, mica, fiber crystalline calcium silicate, calcium carbonate and the like. Of these, talc is particularly preferred. It is preferable to use an inorganic filler having an average particle size of 5 μm or less. In the case of a needle-like or fibrous material, the fiber diameter is 1 to 15 μm, and the aspect ratio is 1 to
100 are preferred.

[D] Additives (1) Phenolic antioxidant The phenolic antioxidant used in the present invention has a molecular weight of 5
00 or more, preferably 700 or more. When the molecular weight of the phenolic antioxidant is less than 500, a part of the antioxidant is volatilized and fogging occurs on the inner surface of the glass, which is not preferable. Such phenolic antioxidants act as heat stabilizers, for example, pentaerythrityl-tetrakis- [methylene-3- (3,5-di-t-butyl-).
4-hydroxyphenyl) propionate], 3,9-
Bis {2- [3- (3-t-butyl-4-hydroxy-
5-methylphenyl) propionyloxy] -1,1-
Dimethylethyl {-2,4,8,10-tetraoxapyrro [5,5] undecane, 1,3,5-tris (2,6
-Dimethyl-3-hydroxy-4-t-butylbenzyl) isocyanurate, 1,3,5-tris (3,5-
Di-tert-butyl-4-hydroxybenzyl) -2,4
6-trimethylbenzene, 1,3,5-tris (3,5
-Di-t-butyl-4-hydroxybenzyl) isocyanurate, calcium bis (3,5-di-t-butyl-4-hydroxybenzylphosphonate) calcium and the like. Among the commercially available phenolic antioxidants, trade names “Irganox 1010” and “Irganox 31”
14 "(manufactured by Ciba-Geigy) or the like. These may be used alone or in combination of two or more.

(2) Hindered amine light stabilizer The hindered amine light stabilizer used in the present invention has a molecular weight of 700 or more. Further, a more preferable range of the molecular weight is 1,000 to 4,000. If the molecular weight of the hindered amine light stabilizer is less than 700, a part of the hindered amine light stabilizer volatilizes and fogging occurs on the inner surface of the glass, which is not preferable. Examples of such a hindered amine light stabilizer include dimethyl succinate / 1- (2-hydroxyethyl) -4-hydroxy-2,2,6,6-tetramethylpiperidine polycondensate and poly {[(6- ( 1,1,3,3-tetramethylbutyl) amino-1,3,5-triazine-2,4-diyl] [2- (2,2,6,6-tetramethyl-4-piperidyl) imino] hexa Methylene [4- (2,2,
6,6-tetramethyl-4-piperidyl) imino]｝,
N, N'-bis (3-aminopropyl) ethylenediamine-2,4-bis [N-butyl-N- (1,2,2,
6,6-pentamethyl-4-piperidyl) amino] -6
-Chloro-1,3,5 triazine condensate and the like. Among the commercially available hindered amine light stabilizers, trade names “Tinuvin 622LD”, “Chimasso”
rb944FL ”,“ Chimassorb 944L ”
D "and" Chimassorb 119FL "(manufactured by Ciba-Geigy), etc. These may be used alone or in combination of two or more.

[E] Other Components In addition to the above-mentioned components, an ethylene-propylene copolymer rubber and / or an ethylene-butene copolymer rubber can be blended. By blending these, the impact resistance can be further improved.

(1) Ethylene-propylene copolymer rubber MFR of ethylene-propylene copolymer rubber (EPR)
Is preferably 0.5 to 20 g / 10 min, and 0.5 to 10 g.
/ 10 minutes is more preferable. If the MFR is less than 0.5 g / 10 minutes, the moldability is reduced, while if it exceeds 20 g / 10 minutes, the mechanical strength is reduced. Further, from the viewpoints of handling properties, productivity, etc., those having an ethylene content of 50 to 90 mol% and a propylene content of 50 to 10 mol% are preferred, and an ethylene content of 60 to 85 mol% and a propylene content of 40 １５15 mol% is more preferred.

(2) Ethylene-butene copolymer rubber The MFR of the ethylene-butene copolymer rubber (EBR) is
0.2 to 30 g / 10 min is preferable, and 0.2 to 20 g / min.
10 minutes is more preferred. If the MFR is less than 0.2 g / 10 minutes, the moldability will decrease, while if it exceeds 30 g / 10 minutes, the mechanical strength will decrease. Further, from the viewpoint of handling properties, productivity, etc., the ethylene content is 70 to 90 mol%,
Preferably, the content of butene-1 is 30 to 10 mol%, and the content of ethylene is 80 to 90 mol%, and the content of butene-1 is more preferably 20 to 10 mol%. In addition, ethylene-butene copolymer rubber may be used in addition to ethylene and butene-1 and other α- and octene-1 such as α.
-A small amount of an olefin, a diene compound such as ethylidene norbornene, dicyclopentadiene or the like may be contained.

[2] Compounding ratio The compounding ratio of each of the above components is as follows.
９９99.5 parts by weight, preferably 55 to 85 parts by weight, polyethylene is 0.5 to 50 parts by weight, preferably 0.5 to 10 parts by weight, inorganic filler is 0 to 50 parts by weight, preferably It is 10 to 30 parts by weight. If the propylene polymer is less than 50 parts by weight, ductility, hardness and the like are low, while if it exceeds 99.5 parts by weight, impact resistance is reduced. If the polyethylene is less than 0.5 parts by weight, the impact resistance is low,
On the other hand, if it exceeds 50 parts by weight, rigidity, hardness and the like will be reduced. Further, when the amount of the inorganic filler exceeds 50 parts by weight, the moldability deteriorates.

As for the additive, the phenolic antioxidant is used in an amount of 0.01 to 1 based on 100 parts by weight of the total of the above components (propylene polymer + polyethylene + inorganic filler).
Parts by weight, preferably 0.03 to 0.2 parts by weight, and the hindered amine light stabilizer is 0.01 to 1 parts by weight, preferably 0.05 to 0.2 parts by weight. If the amount of the phenolic antioxidant is less than 0.01 part by weight, the heat resistance is low. On the other hand, if it exceeds 1 part by weight, the volatile components contained therein cause fogging on the inner surface of the glass, which is not preferable. When the amount of the hindered amine-based light stabilizer is less than 0.01 part by weight, the light resistance is low. On the other hand, when the amount exceeds 1 part by weight, the volatile components contained therein cause fogging on the inner surface of the glass, which is not preferable.

When an ethylene-propylene copolymer rubber and / or an ethylene-butene copolymer rubber is compounded, a propylene polymer, polyethylene, an inorganic filler, an ethylene-propylene copolymer rubber and an ethylene-propylene copolymer rubber are used.
Assuming that the total of the butene copolymer rubber is 100% by weight, the ethylene-propylene copolymer rubber and / or the ethylene-butene copolymer rubber is preferably 50% by weight or less, more preferably 20% by weight or less.

[3] Other Additives The polypropylene resin composition of the present invention may further contain other additives such as a nucleating agent, a flame retardant,
Plasticizers, antistatic agents, release agents, foaming agents, coloring agents, pigments and the like can be added.

[4] Method for Producing Polypropylene Resin Composition The polypropylene resin composition of the present invention is obtained by mixing the above components with a Henschel mixer, a super mixer, a ribbon blender, or the like, and forming a single-screw extruder, a twin-screw extruder, or a Banbury mixer. And can be obtained by melt-kneading in a temperature range of 160 to 270 ° C with a kneader or the like. Alternatively, a masterbatch in which additives such as an inorganic filler, an antioxidant, and a light stabilizer are added at a high concentration may be prepared in advance, and the masterbatch may be blended with a resin such as a propylene polymer.

[0041]

The present invention will be described in more detail with reference to the following Examples and Comparative Examples, but the present invention is not limited thereto.

Production Example 1 Production of Propylene-Ethylene Block Copolymer Preparation of Catalyst Component (A) In a 1-liter reaction vessel equipped with a reflux condenser, under a nitrogen gas atmosphere, chip-shaped metal magnesium (purity 99.
8.3 g of 5%, average particle diameter of 1.6 mm) and 250 ml of n-hexane were added, stirred at 68 ° C. for 1 hour, taken out of the metal magnesium, and dried at 65 ° C. under reduced pressure to obtain a preactivated metal magnesium. Was.

Next, 140 ml of n-butyl ether and n-butyl ether were added to the preactivated metal magnesium.
A suspension obtained by adding 0.5 ml of an n-butyl ether solution (1.75 mol / l) of butylmagnesium chloride was kept at 55 ° C., and 38.5 ml of n-butyl chloride was dissolved in 50 ml of n-butyl ether. The solution was added dropwise over 50 minutes. After conducting the reaction at 70 ° C. for 4 hours with stirring, the reaction solution was kept at 25 ° C.

Next, HC (OC ₂ H ₅ ) ₃ was added to the reaction solution.
55.7 milliliters were added dropwise over one hour. After the completion of the dropwise addition, the reaction was carried out at 60 ° C. for 15 minutes,
-Washed 6 times with 300 ml each of hexane, dried under reduced pressure at room temperature for 1 hour,
31.6 g of a magnesium-containing solid containing 8.9% were recovered.

Under a nitrogen gas atmosphere, 6.3 g of magnesium-containing solid and 50 ml of n-heptane were put into a 300 ml reactor equipped with a reflux condenser, a stirrer and a dropping funnel to form a suspension, and the mixture was stirred at room temperature. While a mixed solution of 20 ml (0.02 mmol) of 2,2,2-trichloroethanol and 11 ml of n-heptane was dropped from the dropping funnel over 30 minutes,
The mixture was further stirred at 80 ° C. for 1 hour. The obtained solid was separated by filtration, washed four times with 100 ml each of n-hexane at room temperature, and twice with 100 ml each of toluene to obtain a solid component.

40 ml of toluene was added to the above solid component, and the volume ratio of titanium tetrachloride / toluene was 3
/ 2 and added to titanium tetrachloride, and the temperature was raised to 90 ° C. Under stirring, a mixed solution of 2 ml of di-n-butyl phthalate and 5 ml of toluene was added dropwise.
Stirred at C for 2 hours. The obtained solid substance was separated by filtration at 90 ° C and washed at 90 ° C twice with 100 ml each of toluene. Further, titanium tetrachloride was added so that the volume ratio of titanium tetrachloride / toluene was 3/2,
And washed with 100 ml each of n-hexane at room temperature seven times to obtain 5.5 g of a catalyst component (A).

In a 500 ml reactor equipped with a prepolymerization stirrer, 3.5 g of the component (A) obtained above and 300 ml of n-heptane were put under a nitrogen gas atmosphere, and cooled to -5 ° C. while stirring. did. Next, triethyl aluminum (TE
AL) in n-heptane (2.0 mol / l) and cyclohexyl i-propoxydimethoxysilane
The concentration of TEAL and cyclohexyl i-propoxydimethoxysilane in the reaction system was 60 mmol /
Liter and 10 mmol / liter and stirred for 5 minutes.

Next, after the pressure in the system was reduced, propylene gas was continuously introduced, and propylene was polymerized for 4 hours.
After the polymerization is completed, gas-phase propylene is purged with nitrogen gas,
The solid phase was washed three times with 100 ml each of n-hexane at room temperature. Further, the solid phase was dried under reduced pressure at room temperature for 1 hour to prepare a catalyst component. As a result of measuring the amount of magnesium contained in the catalyst component, the amount of pre-polymerization was determined as the component (A) 1
It was 1.8 g per g.

In a 5 liter stainless steel autoclave equipped with the polymerization stirrer, 6 ml of n-heptane solution (0.1 mol / l) of triisobutylaluminum (TiBAL) and t-butoxy-t- 6 ml of an n-heptane solution of butyldimethoxysilane (0.01 mol / l) was mixed and the mixture was kept for 5 minutes.

Next, hydrogen gas 1 was used as a molecular weight controlling agent.
After pressurizing 3.5 liters and 3 liters of liquid propylene, the reaction system was heated to 70 ° C. After charging 38.2 mg of the catalyst component obtained above to the reaction system, polymerization of propylene was carried out for 1 hour. After the polymerization is completed, the pressure in the vessel is reduced to 0.
Unreacted propylene and hydrogen were purged until the pressure reached 2 kg / cm ² · G.

After hydrogen was again introduced into the container, a mixed gas having a molar ratio of propylene to ethylene of 1.5 was supplied, the pressure in the container was maintained at 6 kg / cm ² · G, and the pressure was maintained at 75 ° C. for 1 hour. Propylene-ethylene copolymerization was performed. After the polymerization, the unreacted gas was purged to obtain 468 g of a powdery propylene-ethylene block copolymer. Catalyst component (A) 1
The amount of the propylene-ethylene block copolymer produced per g was 34.3 kg, and the MFR of the propylene-ethylene block copolymer was 30 g / 10 min (230 ° C,
(Measured under a load of 2.16 kg). Propylene-
The propylene-ethylene copolymer portion in the ethylene block copolymer is 10% by weight, the ethylene content of the propylene-ethylene copolymer portion is 50% by weight (5% by weight based on the whole), and the intrinsic viscosity [η ] Was 3.5 dl / g. Furthermore, the MFR of the homopolypropylene part is 60
g / 10 min, and the meso average chain length (Nm) is 308.
It was 7.

Examples 1 to 3 and Comparative Examples 1 to 6 Raw materials (1) Propylene polymer BPP: Propylene-ethylene block copolymer produced in Production Example 1 • MFR = 30 g / 10 min (230 ° C, load 2.16 kg) • Propylene-ethylene copolymerized portion = 10% by weight ethylene Content = 50 wt% Intrinsic viscosity [η] = 3.5 dl / g Homopolypropylene portion Ratio = 90 wt% MFR = 60 g / 10 min Meso average chain length Measured value (Nm) = 308.7 Calculated value (Nm ′ = 250 + 29) .5 logMFR) = 302.
Five

(2) Polyethylene PE: high-density polyethylene MI = 30 g / 10 min (190 ° C., load 2.16 kg)

(3) Inorganic filler talc: trade name “LMR100”, manufactured by Fuji Talc Kogyo Co., Ltd. Average particle size = 5.0 μm (measured by laser diffraction scattering method)

(4) Ethylene-propylene copolymer rubber EPR: trade name “EP02P”, manufactured by Nippon Synthetic Rubber Co., Ltd. MFR = 3.2 g / 10 min Ethylene content: 75% by weight

(5) Ethylene-butene copolymer rubber EBR: trade name “EBM2011P”, manufactured by Nippon Synthetic Rubber Co., Ltd. MFR = 1 g / 10 min Ethylene content = 80% by weight

(6) Phenolic antioxidant Ph-1: trade name "Irganox 1010" manufactured by Ciba-Geigy Ph-2: trade name "Irganox 3114" manufactured by Ciba-Geigy Ph-3: 2,6-di-t-butyl-4-methylphenol, molecular weight 220

(7) Hindered amine light stabilizer UV-1: trade name "Chimassorb944", molecular weight 2500, manufactured by Ciba Geigy UV-2: trade name "Tinuvin770", molecular weight 480.7, chiba
Geigy

(8) Other additives TDBPP: phosphorus antioxidant (tris (2,4-di-t-butylphenyl) phosphite) DSTDP: sulfur antioxidant (distearyl-3,3) '-Thiodipropionate) · BTA: 2- (3-t-butyl-5-methyl-2-hydroxydiphenyl) benzotriazole

2. Kneading and molding method The above raw materials were blended at the ratios shown in Table 1 and dry blended using a super mixer, and then 200 rpm at 200 ° C. with a twin screw extruder (PCM-45, manufactured by Ikegai Co., Ltd.).
The mixture was melt-kneaded at a screw rotation speed of m and extruded to obtain pellets. The obtained pellets were injection molded by an injection molding machine at a resin temperature of 210 ° C., an injection pressure of 750 kg / cm ^2, and a mold temperature of 50 ° C. to produce test pieces.

3. Measurement of physical properties Glass haze and weather resistance of each test piece were measured. The results are shown in Table 1 below. (1) Flexural modulus (kg / cm ² ): Measured at room temperature by ASTM D790. (2) Izod impact strength (kg · cm / cm): Measured at room temperature with a notch using a 3.2 mm thick test piece according to ASTM D256. (3) Glass haze (%): 500 ml of 25 × 50 × 2 mm test piece
And a glass plate having a size of 47 × 47 mm and a thickness of 3 mm and also serving as a lid (having a haze of 0.5% or less was used). Soak it in oil up to 2/3 the height of this pressure bottle,
After heating at 20 ° C for 20 hours, the haze value of the glass plate was
It was measured by TM E308. (4) Weather resistance: accelerated test (black panel temperature 83) using Sunshine Carbon Arc (manufactured by Suga Test Co., Ltd.)
℃, 1500 hours), and the surface appearance was observed with a microscope.・ ・ ・: No crack. Δ: Slight crack generation. ×: cracks occurred.

Table 1 Example 1 Example 2 Example 3 Composition components (1) to (5) (% by weight) BPP 80 80 70 PE 10 10 10 Talc 10 10 10 EPR ─ 5 EBR ─ 5 Additive ( Parts by weight) Phenolic antioxidant Ph-1 0.2 1.0 0.2 Ph-2 0.2 1.0 ─ Ph-3 ─ ─ ─ Hindered amine light stabilizer UV-1 0.2 1.0 0.4 UV-2 ─ ─ ─ Other TDBPP ─ ─ ─ DSTDP ─ ─ ─ BTA ─ ─ 特性Characteristic flexural modulus of composition (kg / cm ² ) 21000 21000 18000 Izod impact strength 7 7 18 Glass haze (%) 2.7 4.9 3.6 Weather resistance ○ ○ ○ Note (1) Unit: kg ・cm / cm.

Table 1 (continued) Comparative Example 1 Comparative Example 2 Comparative Example 3 Composition components (1) to (5) (% by weight) BPP 80 80 80 PE 10 10 10 Talc 10 10 10 EPR ─ ─ Ｅ EBR ─ ─ Additives (parts by weight) Phenolic antioxidant Ph-1 0.2 ─ ─ Ph-2 0.2 ─ ─ Ph-3 ─ 0.2 0.2 Hindered amine light stabilizer UV-1 ─ 0.2 0.2 UV-2 ─ ─ ─ Other TDBPP ─ 0.2 ─ DSTDP ─ ─ 0.2 BTA ─ ─ 特性Characteristic flexural modulus (kg / cm ² ) of composition 21000 21000 21000 Izod impact strength 7 7 7 Glass haze (%) 3.4 39.6 42.4 Weatherability × ○ △

Table 1 (continued) Comparative Example 4 Comparative Example 5 Comparative Example 6 Composition (1) to (5) (% by weight) BPP 80 80 90 PE 10 10 タ ル Talc 10 10 10 EPR ─ ─ ─ EBR ─ ─ Additives (parts by weight) Phenolic antioxidant Ph-1 0.2 0.2 0.2 Ph-2 ─ ─ ─ Ph-3 ─ ─ ヒ ン Hindered amine light stabilizer UV-1 ─ ─ 0.2 UV-2 0.2 ─ ─ Other TDBPP ─ ─ ─ DSTDP ─ ─ ─ BTA ─ 0.2 特性Characteristic flexural modulus of composition (kg / cm ² ) 21000 21000 22500 Izod impact strength 7 7 4.5 Glass haze (%) 15.9 25.9 3.8 Weather resistance ○ × ○

As is clear from Table 1, the polypropylene resin compositions of Examples 1 to 3 are excellent in impact resistance, rigidity and weather resistance, have low glass haze, and prevent fogging generated on the inner surface of glass. can do. On the other hand, Comparative Examples 1-6 polypropylene resin composition, impact resistance, rigidity,
At least one of weather resistance and glass haze is inferior.

[0066]

As described in detail above, the polypropylene resin composition of the present invention comprises a propylene polymer containing at least 75% by weight of a homopolypropylene part,
Since it contains polyethylene having a melt index of g / 10 minutes, an inorganic filler, a phenolic antioxidant having a molecular weight of 500 or more, and a hindered amine light stabilizer having a molecular weight of 700 or more, it has excellent weather resistance, It has the effect of preventing fogging occurring on the inner surface of the glass. Such a polypropylene resin composition can be used for various applications, but is particularly suitable as a material for interiors of automobiles.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Asako Komazawa 3-1-1 Chidori-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Technology Development Center, Tonen Chemical Co., Ltd. (72) Inventor Kunio Iwanami Chidori, Kawasaki-ku, Kawasaki-shi, Kanagawa 3-1-1 cho-cho, Tonen Chemical Co., Ltd. Technology Development Center (72) Inventor Akira Kobayashi 3-1-1 Chidori-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Tonen Chemical Co., Ltd. Technical Development Center (72) Inventor Fujita Yuji 3-1-1 Chidori-cho, Kawasaki-ku, Kawasaki-ku, Kanagawa Prefecture Tonen Chemical Co., Ltd. Technology Development Center (56) References JP-A-62-25141 (JP, A) JP-A-4-175353 (JP, A) JP-A-7-118323 (JP, A) JP 1-49421 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08L 1/00-101/16 C08K 3/00 -13/08

Claims (3)

(57) [Claims] (1) 50 to 99.5 parts by weight of a propylene polymer containing 75% by weight or more of a homopolypropylene moiety; and (b) 0.5 to 50 parts by weight of a polyethylene having a melt index of 0.5 to 50 g / 10 minutes. And (c) 0 to 50 parts by weight of an inorganic filler, further comprising
(d) a phenolic antioxidant having a molecular weight of 500 or more based on 100 parts by weight of the total of (a) to (c);
Parts by weight, and (e) a hindered amine light stabilizer having a molecular weight of 700 or more 0.01
-1 part by weight of the polypropylene resin composition. 2. The polypropylene resin composition according to claim 1, wherein the propylene polymer comprises 0.1 to 200 g.
A polypropylene resin composition, which is a homopolypropylene having a melt flow rate of / 10 minutes. 3. The polypropylene resin composition according to claim 1, wherein the propylene polymer has (i) an intrinsic viscosity [η] of 2 to 6 dl / g and an ethylene content of 30 to 70% by weight. A propylene-ethylene block copolymer containing 2 to 25% by weight of a certain propylene-ethylene copolymerized portion and (ii) 98 to 75% by weight of a homopolypropylene portion having a melt flow rate of 0.1 to 200 g / 10 minutes. A polypropylene resin composition, comprising: