JPH0920808A - Crystalline polypropylene - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a crystalline polypropylene excellent in rigidity and heat resistance by bringing a solid component such as a metallic oxide into contact with an olefin in the presence of an organoaluminum compound and a specific organosilicon compound and polymerizing propylene with the resultant catalyst component for polymerizing an α-olefin. SOLUTION: This crystalline polypropylene is obtained by bringing (A) a solid component consisting essentially of a metallic oxide, Mg. Ti, a halogen and an electron donative compound into contact with (D) an olefin in the presence of (B) an organoaluminum compound and (C) an organosilicon compound of formula I R<1> is a 5-7C alicyclic hydrocarbon; R<2> is 2-ethoxyethyl or 2- methyl-3-butyn-2-yl; (x) and (y) are each 1 or 2: [(x)+(y)] is 3}, providing a catalyst component for polymerizing an α-olefin and polymerizing propylene by using the resultant catalyst component. The crystalline polypropylene has 5000-1000000 weight-average molecular weight (Mw) and the heat of melting (ΔHm) obtained from the differential scanning calorimetry and Mw satisfying the relationship of formula II.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to crystalline polypropylene, and more particularly to crystalline polypropylene having excellent rigidity and heat resistance.

[0002]

2. Description of the Related Art Polypropylene has excellent heat resistance, chemical resistance, and electrical properties, and also has excellent rigidity, tensile strength, optical characteristics, and processability, and is injection molded, film molded, sheet molded, blow molded, etc. In addition, polypropylene has a low specific gravity and is widely used in the fields of containers, packaging materials and the like. However, depending on the application, these properties are not sufficiently satisfied, and their use is limited.

Among the performances mentioned above, polypropylene is polystyrene and ABS because of its rigidity and heat resistance.
Inferior to resin. Therefore, polypropylene cannot be used as a material for producing a molded product requiring rigidity and heat resistance, and instead of the polystyrene or ABS resin as a material for a molded product requiring rigidity and heat resistance. , If polypropylene is intentionally used, in order to satisfy the above-mentioned properties, it is necessary to form a thick molded product, which prevents the molded product from being thin and increases the cost of the molded product. Or the application of the polypropylene composition cannot be expanded.

If polypropylene has excellent rigidity, chemical resistance, moldability, heat resistance, hardness, etc., such polypropylene is polystyrene or AB.
As an alternative to the S resin, the application can be expanded and a thin molded product can be finished, so resource saving and cost reduction can be expected.

As a known technique for improving the rigidity of crystalline polypropylene, for example, an organic nucleating agent such as paratertiary butyl benzoic acid aluminum salt or 1,3-2,4-dibenzylidene sorbitol is added. Although there is a method of molding, it has a drawback that the cost is high and it is not economical, and that the addition of the organic nucleating agent significantly reduces gloss, impact strength, tensile elongation and the like. As another means for improving rigidity, there is a method of adding various inorganic fillers such as talc, calcium carbonate, mica, valium sulfate, asbestos, and calcium silicate. In addition, there is a defect that impact strength, gloss, tensile elongation, workability, etc. are deteriorated.

Therefore, it is necessary to develop polypropylene having high crystallinity in order to improve the rigidity and heat resistance of polypropylene, and various crystalline polypropylenes have been attempted to be developed by devising a polymerization catalyst and a polymerization method. Although the rigidity is slightly improved, it is still insufficient and the transparency is insufficient, and even if the aim is to develop polypropylene with high isotacticity, the isotacticity is still within the range of the conventional technology. Yes The effect of improving the rigidity of the molded product is still insufficient.

[0007]

DISCLOSURE OF THE INVENTION The present invention has improved rigidity, heat resistance, and high hardness due to improved crystallinity, and has fatigue characteristics, wear resistance, dimensional stability, chemical resistance, and molding. Provided is a novel propylene homopolymer having excellent properties.

[0008]

As a result of intensive studies, the present inventors have found that it is necessary to improve the stereoregularity in order to increase the rigidity and heat resistance of polypropylene, but the stereoregularity is melted. When heat of fusion (ΔHm) from differential scanning calorimetry (DSC) is used as a measure of the stereoregularity depending on heat (ΔHm), the value of ΔHm expressing high rigidity and high heat resistance is constant. However, the stereoregularity of polypropylene is expressed by the heat of fusion (ΔHm) obtained from differential scanning calorimetry (DSC), and ΔHm and Mw And satisfy the relationship ΔHm ≧ 55.50−5.558 logMw, it was found that the crystalline polypropylene exhibits high rigidity and high heat resistance, and has completed the present invention.

SUMMARY OF THE INVENTION That is, the gist of the present invention is that (A) a solid component containing a metal oxide, magnesium, titanium, a halogen and an electron donating compound as essential components, (B) an organoaluminum compound and (C). ) In the presence of an organosilicon compound represented by the following general formula,

[0010]

Embedded image R ¹ Si (OR ² ) _x (OR ³ ) _y [wherein R ¹ is an alicyclic hydrocarbon group having 5 to 7 carbon atoms, R ^1
2 is a 2-ethoxyethyl group or a 2-methyl-3-butyn-2-yl group, R ³ is a methyl group or an ethyl group, x is 1 or 2, y is 1 or 2, x + y
= 3. ]

(D) A polypropylene obtained by polymerizing propylene using an α-olefin polymerization catalyst component which is brought into contact with an olefin, and has a weight average molecular weight (M
w) is in the range of 5,000 to 1,000,000,
Heat of fusion (Δ) determined from differential scanning calorimetry (DSC)
Hm) and Mw satisfy the relation ΔHm ≧ 55.50-5.558 log Mw, which is crystalline polypropylene.

Here, the heat of fusion (ΔHm) determined by differential scanning calorimetry (DSC) in the present invention means that the sample is enclosed in an aluminum pan and the heat of fusion is measured while the temperature is raised to 200 ° C. In this case, the peak between 85 ° C. and 175 ° C. is taken as the melting peak, and the corresponding heat quantity is divided by the sample quantity to calculate the heat of fusion (unit cal / g).

The weight average molecular weight (Mw) in the present invention
Was measured by gel permeation chromatograph (GPC), and polystyrene was measured under the same conditions. Chem 179 , 2117
It is a value calibrated based on the universal calibration principal described in (1978).

The polypropylene of the present invention has a weight average molecular weight (Mw) of 5,000 to 1,000,000.
Range of 0, preferably 100,000 to 500,000
Of the range. Weight average molecular weight (Mw) is 5,
If it is less than 000, the impact resistance is lowered,
If it exceeds 50,000, the moldability is deteriorated, which is not preferable.
Further, the differential scanning calorimetry (D
The heat of fusion (ΔHm) calculated from SC) is 55.50-
5.558 log Mw or more, preferably 55.55-
5.558 logMw or more, more preferably 55.60
-5.558 logMw or more, and the value is 55.50.
If it is less than −5.558 logMw, the rigidity and heat resistance of polypropylene are insufficient, and a molded product having high rigidity and high heat resistance cannot be obtained.

The polymerization catalyst used in the present invention is as follows. The solid component used in the present invention (hereinafter referred to as component A) contains metal oxides, magnesium, titanium, halogens and electron donating compounds as essential components, and such components are usually metal oxides, magnesium compounds, A titanium compound and an electron donating compound,
Further, in the case where each of the above compounds is a compound having no halogen, it is prepared by bringing the halogen-containing compound into contact with each other.

(1) Metal Oxide The metal oxide used in the present invention is a group II-.
An oxide of an element selected from the group of Group IV elements,
Examples thereof are B ₂ O ₃ , MgO, Al ₂ O ₃ and S.
iO ₂ , CaO, TiO ₂ , ZnO, ZrO ₂ , SnO
₂ , BaO, ThO _{2 and the} like. Among these, B ₂ O ₃ , MgO, Al ₂ O ₃ , SiO ₂ , TiO ₂ ,
ZrO ₂ is preferable, and SiO ₂ is particularly preferable. Furthermore,
Complex oxides containing these metal oxides, such as SiO ₂ −
_{MgO, SiO 2 -Al 2 O 3} , SiO 2 -TiO 2,
_{SiO 2 -V 2 O 3, SiO} 2 -Cr 2 O 3, SiO 2
-TiO ₂ -MgO and the like may also be used.

The shape of these metal oxides is usually powder. Since the shape and shape of the powder often affect the shape of the olefin polymer to be obtained, it is desirable to adjust it appropriately. The metal oxide is
For the purpose of removing poisonous substances in use, it is desirable that the product be baked at as high a temperature as possible and handled so as not to come into direct contact with the atmosphere.

(2) Magnesium Compound The magnesium compound is represented by the general formula MgR ⁴ R ⁵ . In the formula, R ⁴ and R ⁵ represent the same or different hydrocarbon groups, OR ′ groups (R ′ is a hydrocarbon group), and halogen atoms. More specifically, the hydrocarbon group of R ⁴ and R ⁵ is an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group, an aryl group or an aralkyl group, and the OR ′ group is R ′ having a carbon number. Examples of the halogen atom include 1 to 12 alkyl groups, cycloalkyl groups, aryl groups and aralkyl groups, and examples of the halogen atom include chlorine, bromine, iodine and fluorine.

Specific examples of these compounds are shown below, and in the chemical formulas, Me: methyl, Et: ethyl, Pr: propyl, Bu: butyl, He: hexyl, Oct: octyl, Ph: phenyl, cyHe: cyclohexyl, respectively. Show.

MgMe ₂ , MgEt ₂ , Mgi-Pr
₂ , MgBu ₂ , MgHe ₂ , MgOct ₂ , MgEt
Bu, MgPh ₂ , MgcyHe ₂ , Mg (OMe)
₂ , Mg (OEt) ₂ , Mg (OBu) ₂ , Mg (OH
e) ₂ , Mg (OOct) ₂ , Mg (OPh) ₂ , Mg
(OcyHe) ₂ , EtMgCl, BuMgCl, He
MgCl, i-BuMgCl, t-BuMgCl, Ph
MgCl, PhCH ₂ MgCl, EtMgBr, BuM
gBr, PhMgBr, BuMgI, EtOMgCl,
BuOMgCl, HeOMgCl, PhOMgCl, E
tOMgBr, BuOMgBr, EtOMgI, MgC
l ₂ , MgBr ₂ , MgI ₂ .

The above-mentioned magnesium compound can be prepared from metallic magnesium or other magnesium compounds when preparing the component A. Examples thereof include metallic magnesium, halogenated hydrocarbons and alkoxy group-containing compounds of the general formula X _n M (OR) _mn wherein X is a hydrogen atom, a halogen atom or a C 1-20
Hydrocarbon groups, M is a boron, carbon, aluminum, silicon or phosphorus atom, R is a hydrocarbon group having 1 to 20 carbon atoms, m is a valence of M, and m> n ≧ 0. ] Is contacted.

The hydrocarbon groups represented by X and R in the general formula of the alkoxy group-containing compound include methyl (Me), ethyl (Et), propyl (Pr) and i-propyl (i-P).
r), butyl (Bu), i-butyl (i-Bu), hexyl (He), octyl (Oct) and other alkyl groups, cyclohexyl (cyHe), methylcyclohexyl and other cycloalkyl groups, allyl, propenyl, butenyl, etc. And phenyl (Ph), tolyl, xylyl and other aryl groups, and phenethyl and 3-phenylpropyl and other aralkyl groups. Among these, an alkyl group having 1 to 10 carbon atoms is particularly desirable. Hereinafter, specific examples of the alkoxy group-containing compound will be described.

Compound in which M is carbon C (OMe) ₄ , C (OE contained in the formula C (OR) ₄
t) ₄ , C (OPr) ₄ , C (OBu) ₄ , C (Oi-
Bu) ₄ , C (OHe) ₄ , C (OOct) ₄ ; Formula XC
HC (OMe) ₃ , HC (OE) contained in (OR) ₃
t) ₃ , HC (OPr) ₃ , HC (OBu) ₃ , HC
(OHe) ₃ , HC (OPh) ₃ , MeC (OMe)
₃ , MeC (OEt) ₃ , EtC (OMe) ₃ , EtC
(OEt) ₃ , cyHeC (OEt) ₃ , PhC (OM
e) ₃ , PhC (OEt) ₃ , CH ₂ ClC (OEt)
₃ : MeCHBrC (OEt) ₃ , MeCHClC (O
Et) ₃ : ClC (OMe) ₃ , ClC (OEt) ₃ ,
_{ClC (Oi-Bu) 3,} BrC (OEt) 3; wherein X ₂
MeCH (OMe) ₂ , MeC contained in C (OR) ₂
H (OEt) ₂ , CH ₂ (OMe) ₂ , CH ₂ (OE
t) ₂ , CH ₂ ClCH (OEt) ₂ , CH14 ₂ CH
(OEt) ₂ , CCl ₃ CH (OEt) ₂ , CH ₂ Br
CH (OEt) ₂ , PhCH (OEt) ₂ .

Compound where M is Silicon Si (OMe) ₄ , Si Included in Formula Si (OR) ₄
(OEt) ₄ , Si (OBu) ₄ , Si (Oi-Bu)
₄ , Si (OHe) ₄ , Si (OOct) ₄ , Si (O
Ph) ₄ ; HSi (OE contained in the formula XSi (OR) ₃
t) ₃ , HSi (OBu) ₃ , HSi (OHe) ₃ , H
Si (OPh) ₃ : MeSi (OMe) ₃ , MeSi
(OEt) ₃ , MeSi (OBu) ₃ , EtSi (OE
t) ₃ , PhSi (OEt) ₃ , EtSi (OPh)
₃ : ClSi (OMe) ₃ , ClSi (OEt) ₃ , C
lSi (OBu) ₃ , ClSi (OPh) ₃ , BrSi
(OEt) _3; Me ₂ included in the formula X ₂ Si (OR) ₂
Si (OMe) ₂ , Me ₂ Si (OEt) ₂ , Et ₂ S
i (OEt) ₂ : MeClSi (OEt) ₂ : CHCl
₂ SiH (OEt) ₂ : CCl ₃ SiH (OEt) ₂ :
MeBuSi (OEt) ₂ ; M contained in X ₃ SiOR
e ₃ SiOMe, Me ₃ SiOEt, Me ₃ SiOB
u, Me ₃ SiOPh, Et ₃ SiOEt, Ph ₃ Si
OEt.

Compound where M is Boron B (OEt) ₃ , B (OB) included in Formula B (OR) ₃
u) ₃ , B (OHe) ₃ , B (OPh) ₃ . Compound when M is aluminum Al (OMe) ₃ , Al contained in formula Al (OR) ₃
(OEt) ₃ , Al (OPr) ₃ , Al (Oi-Pr)
₃ , Al (OBu) ₃ , Al (Ot-Bu) ₃ , Al
(OHe) ₃ , Al (OPh) ₃ . Compound when M is phosphorus P (OMe) ₃ , P (OE) contained in formula P (OR) ₃
t) ₃ , P (OBu) ₃ , P (OHe) ₃ , P (OP
h) ₃ .

Further, as the magnesium compound, a complex with an organic compound of Group II or IIIa metal (M) of the periodic table can be used. The complex has the general formula MgR ⁴
It is represented by R ⁵ · n (MR ⁶ _m ). As the metal,
It is aluminum, zinc, calcium or the like, and R ⁶ is an alkyl group having 1 to 12 carbon atoms, a cycloalkyl group, an aryl group or an aralkyl group. M represents the valence of the metal M, and n represents a number of 0.1 to 10. Specific examples of the compound represented by MR ⁶ _m include AlMe ₃ , AlEt ₃ ,
_{Ali-Bu 3, AlPh 3,} ZnMe 2, ZnEt
₂ , ZnBu ₂ , ZnPh ₂ , CaEt ₂ , CaPh ₂
And the like.

(3) Titanium Compound The titanium compound is a compound of divalent, trivalent and tetravalent titanium. Examples thereof include titanium tetrachloride, titanium tetrabromide, trichloroethoxytitanium, trichlorobutoxytitanium and dichlorotitanium. Examples thereof include rudiethoxy titanium, dichlorodibutoxy titanium, dichlorodiphenoxy titanium, chlorotriethoxy titanium, chlortributoxy titanium, tetrabutoxy titanium and titanium trichloride. Among these, tetravalent titanium halides such as titanium tetrachloride, trichloroethoxytitanium, dichlorodibutoxytitanium and dichlorodiphenoxytitanium are desirable, and titanium tetrachloride is particularly desirable.

(4) Electron-donating compound As the electron-donating compound, carboxylic acids, carboxylic acid anhydrides, carboxylic acid esters, carboxylic acid halides, alcohols, ethers, ketones, amines,
Examples include amides, nitriles, aldehydes, alcoholates, phosphorus, arsenic, and antimony compounds bonded to an organic group via carbon or oxygen, phosphoamides, thioethers, thioesters, and carbonate esters. Of these, carboxylic acids, carboxylic anhydrides, carboxylic esters, carboxylic halides, alcohols and ethers are preferably used.

Specific examples of the carboxylic acid include formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, caproic acid, pivalic acid, acrylic acid, methacrylic acid, crotonic acid and other aliphatic monocarboxylic acids, malonic acid. , Succinic acid, glutaric acid, adipic acid, sebacic acid, maleic acid, fumaric acid and other aliphatic dicarboxylic acids, tartaric acid and other aliphatic oxycarboxylic acids, cyclohexanemonocarboxylic acid, cyclohexenemonocarboxylic acid, cis-1,2- Cyclohexanedicarboxylic acid, cis-4-methylcyclohexene-1,
Alicyclic carboxylic acids such as 2-dicarboxylic acid, benzoic acid, toluic acid, anisic acid, p-tert-butyl benzoic acid, naphthoic acid, aromatic monocarboxylic acids such as cinnamic acid, phthalic acid, isophthalic acid, Terephthalic acid, naphthalic acid, trimellitic acid, hemimellitic acid, trimesic acid, pyromellitic acid,
And aromatic polycarboxylic acids such as melitic acid. As the carboxylic acid anhydride, the acid anhydrides of the above carboxylic acids can be used.

As the carboxylic acid ester, mono- or polyvalent esters of the above-mentioned carboxylic acids can be used, and specific examples thereof include butyl formate, ethyl acetate, butyl acetate, isobutyl isobutyrate, propyl pivalate, pivalic acid. Isobutyl, ethyl acrylate, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, diethyl malonate, diisobutyl malonate, diethyl succinate, dibutyl succinate, diisobutyl succinate, diethyl glutarate, dibutyl glutarate, diisobutyl glutarate, Diisobutyl adipate, dibutyl sebacate, diisobutyl sebacate, diethyl maleate, dibutyl maleate, diisobutyl maleate,
Monomethyl fumarate, diethyl fumarate, diisobutyl fumarate, diethyl tartrate, dibutyl tartrate, diisobutyl tartrate, ethyl cyclohexanecarboxylate, methyl benzoate, ethyl benzoate, methyl p-toluate, p
-Ethyl tertiary butyl benzoate, ethyl p-anisate,
Ethyl α-naphthoate, isobutyl α-naphthoate, ethyl cinnamate, monomethyl phthalate, monobutyl phthalate, dibutyl phthalate, diisobutyl phthalate, dihexyl phthalate, dioctyl phthalate, di2-ethylhexyl phthalate, phthalic acid Diallyl, diphenyl phthalate, diethyl isophthalate, diisobutyl isophthalate, diethyl terephthalate, dibutyl terephthalate, diethyl naphthalate, dibutyl naphthalate, triethyl trimellitate, tributyl trimellitate, tetramethyl pyromelliticate, tetraethyl pyromelliticate, tetrabutyl pyromelliticate. Etc.

As the carboxylic acid halide, acid halides of the above carboxylic acids can be used.
Specific examples thereof include acetate chloride, acetate bromide, acetate iodide, propionate chloride, butyrate clomid,
Butyric acid bromide, Butyric acid iodide, Pivalic acid chloride, Pivalic acid bromide, Acrylic acid chloride, Acrylic acid bromide, Acrylic acid iodide, Methacrylic acid chloride, Methacrylic acid bromide, Methacrylic acid iodide, Crotonic acid chloride, Malonic acid chloride, Malonic acid bromide, Succinic chloride, succinic bromide,
Glutaric acid chloride, glutaric acid bromide, adipic acid chloride, adipic acid bromide, sebacic acid chloride,
Sebacic acid bromide, maleic acid chloride, maleic acid bromide, fumaric acid chloride, fumaric acid bromide, tartaric acid chloride, tartaric acid bromide, cyclohexanecarboxylic acid chloride, cyclohexanecarboxylic acid bromide, 1-
Cyclohexenecarboxylic acid chloride, cis-4-methylcyclohexenecarboxylic acid chloride, cis-4-methylcyclohexenecarboxylic acid bromide, benzoyl chloride,
Benzoyl bromide, p-toluic acid chloride, p-toluic acid bromide, p-anisic acid chloride, p-anisic acid bromide, α-naphthoic acid chloride, cinnamic acid chloride,
Examples include cinnamic acid bromide, phthalic acid dichloride, phthalic acid dibromide, isophthalic acid dichloride, isophthalic acid dibromide, terephthalic acid dichloride, and naphthalic acid dichloride. Further, monoalkyl halides of dicarboxylic acids such as adipic acid monomethyl chloride, maleic acid monoethyl chloride, maleic acid monomethyl chloride and phthalic acid butyl chloride can also be used.

Alcohols are represented by the general formula R ⁷ OH. In the formula, R ⁷ is alkyl having 1 to 12 carbons,
Alkenyl, cycloalkyl, aryl and aralkyl. Specific examples thereof include methanol, ethanol, propanol, isopropanol, butanol, isobutanol, pentanol, hexanol, octanol, 2-ethylhexanol, cyclohexanol,
Benzyl alcohol, allyl alcohol, phenol,
Cresol, xylenol, ethylphenol, isopropylphenol, p-tert-butylphenol, n-octylphenol and the like.

The ethers are represented by the general formula R ⁸ OR ⁹ . In the formula, R ⁸ and R ⁹ are alkyl, alkenyl, cycloalkyl, aryl and aralkyl having 1 to 12 carbon atoms, and R ⁸ and R ⁹ may be the same or different. Specific examples thereof include diethyl ether, diisopropyl ether, dibutyl ether, diisobutyl ether,
Diisoamyl ether, di-2-ethylhexyl ether, diallyl ether, ethyl allyl ether, butyl allyl ether, diphenyl ether, anisole, ethylphenyl ether and the like.

Component A is prepared by contacting a metal oxide (component 1), a magnesium compound (component 2), a titanium compound (component 3) and an electron donating compound (component 4) in that order. After contacting the ingredient 2 with
Component 4 and component 3 are contacted in that order, component 1 and component 2 are contacted, then component 3 and component 4 are contacted simultaneously, component 2 and component 3 are contacted, and then component 4 and component 1
Are contacted in that order, components 2 and 4 are contacted, and then components 3 and 1 are contacted in that order. A method of contacting the component 2, the component 3, and the component 4 at the same time, and then contacting the component 1, or the like can be adopted. It is also possible to contact the halogen-containing compound before contacting component 3.

As the halogen-containing compound, halogenated hydrocarbons, halogen-containing alcohols, silicon halide compounds having a hydrogen-silicon bond, Group IIIa of the periodic table, I
Examples thereof include a Va group, a halide of a Va group element (hereinafter referred to as a metal halide), and the like.

Halogenated hydrocarbons include those having 1 to 1 carbon atoms.
Mono- and poly-halogen substituents of 12 saturated or unsaturated aliphatic, cycloaliphatic and aromatic hydrocarbons. Specific examples of such compounds include, for aliphatic compounds, methyl chloride, methyl bromide, methyl iodide, methylene chloride, methylene bromide, methylene iodide, chloroform, bromoform, iodoform, carbon tetrachloride, carbon tetrabromide, Carbon iodide, ethyl chloride, ethyl bromide, ethyl iodide, 1,2-
Dichloroethane, 1,2-dibromoethane, 1,2-diiodoethane, methylchloroform, methylbromoform, methyliodoform, 1,1,2-trichloroethylene, 1,1,2-tribromoethylene, 1,1,2,2
2-tetrachloroethylene, pentachloroethane, hexachloroethane, hexabromoethane, n-propyl chloride, 1,2-dichloropropane, hexachloropropylene, octachloropropane, decabromobutane,
Chlorinated paraffins and the like, alicyclic compounds include chlorocyclopropane, tetrachlorocyclopentane, hexachlorocyclopentadiene, hexachlorocyclohexane and the like, and aromatic compounds include chlorobenzene, bromobenzene, o-dichloro. Examples thereof include benzene, p-dichlorobenzene, hexachlorobenzene, hexabromobenzene, benzotrichloride and p-chlorobenzotrichloride. These compounds may be used alone or in combination of two or more.

As the halogen-containing alcohol, any one or two or more hydrogen atoms other than the hydroxyl group in the mono- or polyhydric alcohol having one or two or more hydroxyl groups in one molecule are substituted with halogen atoms. It is a compound. Examples of the halogen atom include chlorine, bromine, iodine and fluorine atoms, and a chlorine atom is preferable.

Examples of these compounds are 2-chloroethanol, 1-chloro-2-propanol, 3-chloro-1-propanol, 1-chloro-2-methyl-2-propanol, 4-chloro-1-butanol, 5-chloro-1-pentanol, 6-chloro-1-hexanol,
3-chloro-1,2-propanediol, 2-chlorocyclohexanol, 4-chlorobenzhydrol,
(M, o, p) -chlorobenzyl alcohol, 4-chlorocatechol, 4-chloro- (m, o) -cresol,
6-chloro- (m, o) -cresol, 4-chloro-
3,5-dimethylphenol, chlorohydroquinone,
2-benzyl-4-chlorophenol, 4-chloro-1
-Naphthol, (m, o, p) -chlorophenol, p
-Chloro-α-methylbenzyl alcohol, 2-chloro-4-phenylphenol, 6-chlorothymol, 4-
Chlorresorcin, 2-bromoethanol, 3-bromo-1-propanol, 1-bromo-2-propanol,
1-bromo-2-butanol, 2-bromo-p-cresol, 1-bromo-2-naphthol, 6-bromo-2-
Naphthol, (m, o, p) -bromophenol, 4-
Bromresorcin, (m, o, p) -fluorophenol, p-iodophenol: 2,2-dichloroethanol, 2,3-dichloro-1-propanol, 1,3-dichloro-2-propanol, 3- Chlor-1- (α-chloromethyl) -1-propanol, 2,3-dibromo-
1-propanol, 1,3-dibromo-2-propanol, 2,4-dibromophenol, 2,4-dibromo-
1-naphthol: 2,2,2-trichloroethanol,
1,1,1-trichloro-2-propanol, β, β,
β-trichloro-tert-butanol, 2,3,4-
Trichlorophenol, 2,4,5-trichlorophenol, 2,4,6-trichlorophenol, 2,4,6
-Tribromophenol, 2,3,5-tribromo-2
-Hydroxytoluene, 2,3,5-tribrom-4-
Hydroxytoluene, 2,2,2-trifluoroethanol, α, α, α-trifluoro-m-cresol,
2,4,6-Triiodophenol: 2,3,4,6-
Tetrachlorophenol, tetrachlorohydroquinone, tetrachlorobisphenol A, tetrabromobisphenol A, 2,2,3,3-tetrafluoro-1-
Propanol, 2,3,5,6-tetrafluorophenol, tetrafluororesorcin and the like can be mentioned.

Examples of the halogenated silicon compound having a hydrogen-silicon bond include HSiCl ₃ , H ₂ SiCl ₂ , H ₃ S.
iCl, H (CH ₃ ) SiCl ₂ , H (C ₂ H ₅ ) Si
_{Cl 2, H (t-C} 4 H 9) SiCl 2, H (C 6 H
_{5) SiCl 2, H (CH} 3) 2 SiCl, H (i-C
_{3 H 7) 2 SiCl, H} 2 (C 2 H 5) SiCl, H 2
_{(N-C 4 H 9)} SiCl, H 2 (C 6 H 4 CH 3) S
iCl, H (C ₆ H ₅ ) ₂ SiCl and the like.

As the metal halide, B, Al, Ga,
In, Tl, Si, Ge, Sn, Pb, As, Sb, B
and i) chlorides, fluorides, bromides, and iodides, especially BCl ₃ , BBr ₃ , BI ₃ , AlCl ₃ , and AlBr.
₃ , GaCl ₃ , GaBr ₃ , InCl ₃ , TlCl
₃ , SiCl ₄ , SnCl ₄ , SbCl ₅ , SbF _{5 and the} like are preferable.

The contact with the component 1, the component 2, the component 3 and the component 4, and the halogen-containing compound which can be optionally contacted is carried out by mixing and stirring in the presence of an inert medium or in the absence thereof. This is done by mechanical co-milling. The contact can be performed under heating at 40 to 150 ° C. The inert medium, hexane, heptane, saturated aliphatic hydrocarbons such as octane, cyclopentane, saturated alicyclic hydrocarbons such as cyclohexane, benzene, toluene,
Aromatic hydrocarbons such as xylene can be used.

A desirable method for preparing the component A in the present invention is described in JP-A-58-162607 and JP-A-55-94909.
No. 55-115405, No. 57-108107.
No. 61-21109, 61-174204,
The methods disclosed in JP-A Nos. 61-174205, 61-174206, 62-7706 and the like can be mentioned. More specifically, a method in which a reaction product of a metal oxide and a magnesium alkoxide is contacted with an electron donating compound and a tetravalent titanium halide (JP-A-58-162607),

A method of bringing a reaction product of an inorganic oxide and a magnesium hydrocarbyl halide compound into contact with a Lewis base compound and titanium tetrachloride (JP-A-55-9).
4909), a method in which a reaction product of a porous carrier such as silica with an alkyl magnesium compound is contacted with an electron donating compound and a silicon halide compound before contacting with a titanium compound (JP-A-55-115405). , Ibid. 57-1081
No. 07),

A method of contacting a metal oxide, an alkoxy group-containing magnesium compound, an aromatic polyvalent carboxylic acid having a carboxyl group at the ortho position or a derivative thereof, and a titanium compound (JP-A-61-174204), metal oxide , An alkoxy-containing magnesium compound,
A method of bringing a silicon compound having a hydrogen-silicon bond, an electron donating compound and a titanium compound into contact with each other (JP-A-61-17).
4205),

A method of contacting a metal oxide, an alkoxy-containing magnesium compound, a halogen element or a halogen-containing compound, an electron-donating compound and a titanium compound (JP-A-61-174206), metal oxide, dihydrocarbyl magnesium and halogen. A method of bringing a reaction product obtained by bringing a contained alcohol into contact with an electron-donating compound and a titanium compound (JP-A-61-21109),

A solid obtained by contacting a metal oxide, a hydrocarbyl magnesium and a hydrocarbyloxy group-containing compound (corresponding to the alkoxy group-containing compound) is contacted with a halogen-containing alcohol, and further contacted with an electron donating compound and a titanium compound. The method (Japanese Patent Laid-Open No. 62-7706). Among these, the method (1) is preferable, and the method (3) is particularly preferable. The component A is prepared as described above, and the component A may be washed with the above-mentioned inert medium, if necessary, and further dried.

Organoaluminum Compound The organoaluminum compound (hereinafter referred to as component B) is
General formula

Embedded image AlR ₃ [wherein R represents an alkyl group having 1 to 12 carbon atoms]. ] Is represented. Specific examples include trimethyl aluminum, triethyl aluminum, tripropyl aluminum, triisopropyl aluminum, tributyl aluminum, triisobutyl aluminum,
Trihexyl aluminum and the like.

Organosilicon Compound The organosilicon compound (hereinafter referred to as component C), which is one component of the catalyst of the present invention, has the following general formula.

Embedded image R ¹ Si (OR ² ) _x (OR ³ ) _y is represented. In the formula, R ¹ is an alicyclic hydrocarbon group having 5 to 7 carbon atoms, R ² is a 2-ethoxyethyl group or 2-methyl-3-butyn-2-yl group, and R ³ is a methyl group or ethyl. A group, x is 1 or 2, y is 1
Or 2, x + y = 3.

Specific examples of the component C will be listed below. Cyclopentyl (2-ethoxyethoxy) dimethoxysilane, cyclopentyldi (2-ethoxyethoxy) methoxysilane, cyclopentyl (2-ethoxyethoxy) diethoxysilane, cyclopentyldi (2 -Ethoxyethoxy) ethoxysilane, cyclohexyl (2-ethoxyethoxy) dimethoxysilane, cyclohexyldi (2-
Ethoxyethoxy) methoxysilane, cyclohexyl (2-ethoxyethoxy) diethoxysilane, cyclohexyldi (2-ethoxyethoxy) ethoxysilane, cycloheptyl (2-ethoxyethoxy) dimethoxysilane, cycloheptyldi (2-ethoxyethoxy) methoxysilane , Cycloheptyl (2-ethoxyethoxy) diethoxysilane, cycloheptyldi (2-ethoxyethoxy) ethoxysilane, cyclopentyl (2-methyl-
3-butyne-2-oxy) dimethoxysilane, cyclopentyldi (2-methyl-3-butyne-2-oxy) methoxysilane, cyclopentyl (2-methyl-3-butyne-2-oxy) diethoxysilane, cyclopentyldi ( 2-methyl-3-butyne-2-oxy) ethoxysilane, cyclohexyl (2-methyl-3-butyne-2-oxy) dimethoxysilane, cyclohexyldi (2-methyl-3-butyne-2-oxy) methoxysilane, Cyclohexyl (2-methyl-3-butyne-2-oxy) diethoxysilane, cyclohexyldi (2-methyl-3-butyne-2-oxy) ethoxysilane, cycloheptyl (2-methyl-3-butyne-2-oxy) ) Dimethoxysilane, cycloheptyldi (2-methyl-3-butyne-2)
-Oxy) methoxysilane, cycloheptyl (2-methyl-3-butyne-2-oxy) diethoxysilane, cycloheptyldi (2-methyl-3-butyne-2-oxy)
Examples include ethoxysilane.

Prepolymerization The prepolymerization of the solid component (component A) is carried out by contacting it with an olefin (component D) in the presence of an organoaluminum compound (component B) and an organosilicon compound (component C). It is preferable to add an electron-donating compound (hereinafter, referred to as component E) together with components B and C during the prepolymerization of component A, if necessary.

Examples of the electron-donating compound include electron-donating compounds composed of organic silicon compounds, nitrogen, sulfur, oxygen,
An electron donating compound containing a hetero atom such as phosphorus can be used, but an organic silicon compound is preferable among them. The organic silicon compound has a total of 4 alkyl and alkoxy groups.
Those bonded to individual silicon atoms are preferred, and these alkyl groups and alkoxy groups may be chain-like, and some of them may be O,
It may be substituted with a hetero element such as N or S.

Specific examples of the organosilicon compound include tetramethoxysilane, tetraethoxysilane, tetrabutoxysilane, tetraisobutoxysilane, tetraphenoxysilane, tetra (p-methylphenoxy) silane, tetrabenzyloxysilane and methyltrimethoxy. Silane, methyltriethoxysilane, methyltributoxysilane, methyltriphenoxysilane, ethyltriethoxysilane, ethyltriisobutoxysilane, ethyltriphenoxysilane, butyltrimethoxysilane, butyltriethoxysilane, butyltributoxysilane, butyltri Phenoxysilane, isobutyltriisobutoxysilane, vinyltriethoxysilane, allyltrimethoxysilane, dimethyldiisopropoxysilane, dimethyldibutoxysilane, Methyl dihexyl silane,
Dimethyldiphenoxysilane, diethyldiethoxysilane, diethyldiisobutoxysilane, diethyldiphenoxysilane, dibutyldiisopropoxysilane, dibutyldibutoxysilane, dibutyldiphenoxysilane, diisobutyldiethoxysilane, diisobutyldiisobutoxysilane, diphenyldimethoxysilane, Examples thereof include diphenyldiethoxysilane, diphenyldibutoxysilane, dibenzyldiethoxysilane, divinyldiphenoxysilane, diallyldipropoxysilane, diphenyldiallyloxysilane, methylphenyldimethoxysilane and chlorophenyldiethoxysilane.

Specific examples of the electron-donating compound containing a hetero atom include compounds containing a nitrogen atom:
6,6-tetramethylpiperidine, 2,6-dimethylpiperidine, 2,6-diethylpiperidine, 2,6-diisopropylpiperidine, 2,6-diisobutyl-4-methylpiperidine, 1,2,2,6,6- Pentamethylpiperidine, 2,2,5,5-tetramethylpyrrolidine,
2,5-dimethylpyrrolidine, 2,5-diethylpyrrolidine, 2,5-diisopropylpyrrolidine, 1,2,
2,5,5-pentamethylpyrrolidine, 2,2,5-trimethylpyrrolidine, 2-methylpyridine, 3-methylpyridine, 4-methylpyridine, 2,6-diisopropylpyridine, 2,6-diisobutylpyridine, 1, 2,
4-trimethylpiperidine, 2,5-dimethylpiperidine, methyl nicotinate, ethyl nicotinate, nicotinic acid amide, benzoic acid amide, 2-methylpyrrole, 2,5
-Dimethylpyrrole, imidazole, toluic acid amide, benzonitrile, acetonitrile, aniline, paratoluidine, orthotoluidine, metatoluidine, triethylamine, diethylamine, dibutylamine, tetramethylenediamine, tributylamine and the like, as a compound containing a sulfur atom, thiol Phenol, thiophene,
Ethyl 2-thiophenecarboxylate, Ethyl 3-thiophenecarboxylate, 2-Methylthiophene, Methyl mercaptan, Ethyl mercaptan, Isopropyl mercaptan, Butyl mercaptan, Diethyl thioether, Diphenyl thioether, Methyl benzene sulfonate, Methyl sulfite, Ethyl sulfite, etc. Is, as a compound containing an oxygen atom, tetrahydrofuran, 2-methyltetrahydrofuran, 3-methyltetrahydrofuran,
2-ethyltetrahydrofuran, 2,2,5,5-tetraethyltetrahydrofuran, 2,2,5,5-tetramethyltetrahydrofuran, 2,2,6,6-tetraethyltetrahydropyran, 2,2,6,6-tetramethyl Tetrahydropyran, dioxane, dimethyl ether, diethyl ether, dibutyl ether, diisoamyl ether, diphenyl ether, anisole, acetophenone, acetone, methyl ethyl ketone, acetylacetone, o-tolyl-t-butyl ketone, methyl-2,
6-di-t-butylphenyl ketone, 2-ethyl ethyl furarate, isoamyl 2-furarate, methyl 2-furarate, 2
-Propyl furarate and the like, as a compound containing a phosphorus atom, triphenylphosphine, tributylphosphine,
Examples thereof include triphenyl phosphite, tribenzyl phosphite, diethyl phosphate, diphenyl phosphate and the like.

Two or more kinds of these electron donating compounds may be used. These electron donating compounds may be used when the organometallic compound is used in combination with the catalyst component, or may be used after being brought into contact with the organometallic compound in advance. Examples of the olefin include, in addition to ethylene, α- such as propylene, 1-butene, 1-hexene, and 4-methyl-1-pentene.
Olefins may be used.

The prepolymerization is preferably carried out in the presence of the above-mentioned inert medium. The prepolymerization is usually performed at a temperature of 100 ° C. or lower, preferably −30 ° C. to + 30 ° C., more preferably −30 ° C.
It is performed at a temperature of 20 ° C to + 15 ° C. The polymerization system may be either a batch system or a continuous system, or may be performed in two or more stages. When the reaction is carried out in multiple stages, the polymerization conditions can of course be changed.

Component B has a concentration of 10 to 5 in the prepolymerization system.
It is used in an amount of 00 mmol / l, preferably 30 to 200 mmol / l, and 1 to 50,000 mol, preferably 2 to 1,000 mol, per gram atom of titanium in component A. Used. Component C is used so that the concentration in the prepolymerization system is 1 to 100 mmol / liter, preferably 5 to 50 mmol / liter. The olefin polymer is incorporated into the component A by the prepolymerization.
It is desirable that the amount is 0.1 to 200 g, especially 0.5 to 50 g.

The catalyst component of the present invention prepared as described above can be diluted or washed with the above-described inert medium, but from the viewpoint of preventing storage deterioration of the catalyst component,
It is particularly desirable to wash. After washing, it may be dried if necessary. When the catalyst component is stored, it is desirable to store it at a low temperature as much as possible, and a temperature range of -50 ° C to + 30 ° C, particularly -20 ° C to + 5 ° C is recommended.

Main Polymerization The catalyst component obtained as described above is used in combination with an organometallic compound and, if necessary, an electron-donating compound to homopolymerize propylene or copolymerize with other monoolefins. Polymerization is performed to obtain crystalline polypropylene having a relationship between the heat of fusion (ΔHm) determined by differential scanning calorimetry (DSC) and the weight average molecular weight (Mw) measured by GPC, which is represented by the above formula.

Organometallic compounds which can be used are organic compounds of metals of groups I to III of the periodic table. As the compound, an organic compound of lithium, magnesium, calcium, zinc and aluminum can be used. Among these, an organoaluminum compound is particularly preferable.

Organoaluminum compounds that can be used include those represented by the general formula R _n AlX ' _3-n (wherein R is an alkyl group or an aryl group, X'is a halogen atom, an alkoxy group or a hydrogen atom, and n is 1≤n Is an arbitrary number within the range of ≦ 3), and examples thereof include trialkylaluminum, dialkylaluminum monohalide, monoalkylaluminum dihalide, alkylaluminum sesquihalide, dialkylaluminum monoalkoxide and dialkylaluminum monohydride. Particularly preferred is an alkylaluminum compound having 1 to 18 carbon atoms, preferably 2 to 6 carbon atoms, or a mixture or complex compound thereof. Specifically, such as trimethyl aluminum, triethyl aluminum, tripropyl aluminum, triisobutyl aluminum, trialkyl aluminum such as trihexyl aluminum, dimethyl aluminum chloride, diethyl aluminum chloride, diethyl aluminum bromide, diethyl aluminum iodide, diisobutyl aluminum chloride, etc. Dialkyl aluminum monohalide, methyl aluminum dichloride, ethyl aluminum dichloride, methyl aluminum dibromide, ethyl aluminum dibromide, ethyl aluminum diiodide,
Monoalkyl aluminum dihalides such as isobutyl aluminum dichloride, alkyl aluminum sesquihalides such as ethyl aluminum sesquichloride, dimethyl aluminum methoxide, diethyl aluminum ethoxide, diethyl aluminum phenoxide, dipropyl aluminum ethoxide, diisobutyl aluminum ethoxide, diisobutyl aluminum phenoxide And dialkylaluminum hydride, dimethylaluminum hydride, diethylaluminum hydride, dipropylaluminum hydride, diisobutylaluminum hydride and the like. Among these, trialkyl aluminum, particularly triethyl aluminum and triisobutyl aluminum are desirable. Further, these trialkylaluminums are other organoaluminum compounds, for example, industrially available diethylaluminum chloride, ethylaluminum dichloride, ethylaluminum sesquichloride, diethylaluminum ethoxide, diethylaluminum hydride or mixtures or complex compounds thereof Etc. can be used in combination.

It is also possible to use an organoaluminum compound in which two or more aluminum atoms are bound via an oxygen atom or a nitrogen atom. Examples of such compounds include

Embedded image Etc. can be exemplified.

Examples of organic compounds of metals other than aluminum metal include diethylmagnesium, ethylmagnesium chloride, diethylzinc and the like, and LiAl (C ₂ H ₅ ).
₄ , compounds such as LiAl (C ₇ H ₁₅ ) _{4 and the} like.
The electron-donating compound that can be optionally combined with the catalyst component and the organometallic compound of the present invention is appropriately selected from electron-donating compounds that may be used in the prepolymerization of the component A. .

Two or more kinds of these electron donating compounds may be used. Further, these electron donating compounds may be used when an organometallic compound is used in combination with a catalyst component,
It may be used after being brought into contact with the organometallic compound in advance. The amount of the organometallic compound used with respect to the catalyst component of the present invention is usually 1 to 2,0 per 1 gram atom of titanium in the catalyst component.
00 gram moles, especially 20 to 500 gram moles are desirable.

When an electron-donating compound is used, the ratio of the organometallic compound to the electron-donating compound is 0.1 to 40, preferably 1 to 40, preferably 1 to 100, with respect to 1 mol of the electron-donating compound. Selected in the range of 25 gram atoms. The propylene polymerization reaction may be either a gas phase or a liquid phase, and when polymerizing in a liquid phase, an inert carbon such as normal butane, isobutane, normal pentane, isopentane, hexane, heptane, octane, cyclohexane, benzene, toluene, xylene, etc. It can be carried out in hydrogen fluoride and in liquid monomers. The polymerization temperature is usually -8.
It is in the range of 0 ° C to + 150 ° C, preferably 40 to 120 ° C. The polymerization pressure may be, for example, 1 to 60 atm. Adjustment of the molecular weight of the resulting polymer is performed by the presence of hydrogen or other known molecular weight regulators. The polymerization reaction is carried out by a continuous or batch-type reaction, and the condition may be a commonly used condition. Further, the polymerization reaction may be performed in one stage, or may be performed in two or more stages.

[0065]

EXAMPLES The present invention will be specifically described with reference to examples and application examples. The percentages (%) in the examples are by weight unless otherwise specified. The heat of fusion (ΔHm) is measured by differential scanning calorimetry (DSC), and the measuring method is DSC7 (7700 Data S manufactured by Perkin Elmer Co., Ltd.).
of a 0.5 mm thick sheet press-molded at 210 ° C. for 1 minute, punched out in an aluminum pan and held at 230 ° C. for 10 minutes, then at 10 ° C. /
The temperature is decreased to 50 ° C. in minutes, then the temperature is increased to 200 ° C. at 10 ° C./minute, the peak between 85 ° C. and 175 ° C. at the time of temperature increase is taken as the melting peak, and the corresponding heat quantity is divided by the sample amount. The heat of fusion (unit cal / g) is calculated. The weight average molecular weight (Mw) in the present invention is measured by gel permeation chromatograph (GPC), and the measuring method is 150C type manufactured by Waters Co., Polymer Laboratory Mixed B column 30 cm × 3. The measurement was carried out using a measurement temperature of 140 ° C. and a measurement solvent orthodichlorobenzene. For the molecular weight, polystyrene was measured under the same conditions, and Makromol, Chem 1
79 , 2117 (1978).

(Example 1) Preparation of component A A 200 ml flask equipped with a dropping funnel and a stirrer was replaced with nitrogen gas. Into this flask, 5 g of silicon oxide (manufactured by DAVISON, trade name G-952) fired in a nitrogen stream at 200 ° C. for 2 hours and further 5 hours at 700 ° C. and 40 ml of n-heptane were put.
Further, 20 ml of a 20% n-heptane solution of n-butylethylmagnesium (hereinafter referred to as "BEM") (trade name: MAGALA BEM, manufactured by Texas Alkyls) was added, and the mixture was stirred at 90 ° C for 1 hour.

After cooling the above suspension to 0 ° C., a solution of 11.2 g of tetraethoxysilane dissolved in 20 ml of n-heptane was added dropwise to the suspension through the dropping funnel over 30 minutes. After the dropping is completed, the temperature is raised to 50 ° C over 2 hours, and the temperature is 50 ° C.
For 1 hour. After the reaction was completed, the supernatant was removed by decantation, and the produced solid was mixed with 60 ml of n-
It was washed with heptane at room temperature, and the supernatant was removed by decantation. This washing treatment with n-heptane was further performed four times.

To the above solid, 50 ml of n-heptane was added to form a suspension, and a solution of 8.0 g of 2,2,2-trichloroethanol in 10 ml of n-heptane was added to the solid at 25 ° C. from a dropping funnel. Was added dropwise over 15 minutes. After completion of the dropping, the mixture was washed twice with 60 ml of n-heptane and three times with 60 ml of toluene at room temperature. When the obtained solid (solid component I) was analyzed, it contained 36.6% SiO ₂ , 5.1% magnesium, and 38.5% chlorine.

10 ml of n-heptane and 40 ml of titanium tetrachloride were added to the solid component I obtained above, the temperature was raised to 90 ° C., and di-n-phthalate dissolved in 5 ml of n-heptane was added.
0.6 g of butyl was added over 5 minutes. Then, 11
The temperature was raised to 5 ° C. and the reaction was performed for 2 hours. After cooling to 90 ° C., the supernatant was removed by decantation, and the mixture was washed twice with 70 ml of n-heptane. Furthermore, n-heptane 1
5 ml and 40 ml of titanium tetrachloride were added and reacted at 115 ° C. for 2 hours. After the reaction is completed, the obtained solid substance is
Washing was performed 8 times at room temperature with 1 n-hexane. Then, it was dried at room temperature under reduced pressure for 1 hour to obtain 8.3 g of a catalyst component (component A). This component A contained 3.1% of titanium, silicon oxide, magnesium, chlorine and di-n-butyl phthalate.

In a 500 ml reactor equipped with a prepolymerization stirrer, 1.8 g of the component A obtained above and 270 ml of n-heptane were placed under a nitrogen gas atmosphere and cooled to 0 ° C. with stirring. Next, an n-heptane solution (2.0 mol / liter) of triisobutylaluminum (hereinafter abbreviated as TIBAL) and an n-heptane solution of cyclohexyl (2-methyl-3-butyne-2-oxy) diethoxysilane ( 1.0 mol / liter) was added so that the concentrations of TIBAL and cyclohexyl (2-methyl-3-butyne-2-oxy) diethoxysilane in the reaction system were 60 mmol / liter and 10 mmol / liter, respectively. Stir for 5 minutes. Next, after decompressing the system by 40 mmHg,
Propylene gas was supplied and propylene was polymerized for 2 hours. After completion of the polymerization, propylene in the gas phase was purged with nitrogen gas, n-heptane at 0 ° C was added, and the mixture was diluted 5-fold. Thus, a slurry of the catalyst component was prepared. A part of the slurry was taken out and dried, and the amount of magnesium contained in the catalyst component was measured. As a result, the amount of preliminary polymerization was 2.6 g per component Alg.

In a 5-liter stainless steel autoclave equipped with the main polymerization stirrer, 6 ml of an n-heptane solution of TIBAL (0.1 mol / liter) and an n-heptane solution of propyltriethoxysilane (0. (01 mol / liter) 6 ml was mixed and held for 5 minutes. Then, 16.4 liters of hydrogen gas (normal temperature and normal pressure) as a molecular weight control agent and 3 liters of liquid propylene were injected, and the reaction system was heated to 70 ° C. After charging 51.6 mg of the catalyst component obtained above into the reaction system, propylene was polymerized for 1 hour. After the polymerization was completed, unreacted propylene was purged to obtain 604.9 g of white polypropylene powder. Polypropylene production amount (CE) per component Alg
Was 42.2 kg.

The weight average molecular weight of this polypropylene (M
w) is 75,000, heat of fusion (ΔHm) 28.82 ca
The flexural modulus was 18,000 kgf / cm ² , and the heat distortion temperature was 121 ° C. The results are shown in Table 3.

(Examples 2 to 4) Prepolymerization and main polymerization were carried out in the same manner as in Example 1 under the conditions shown in Tables 1 and 2. Table 3 shows the results of measuring the polymerization and physical properties of these polypropylenes.

Comparative Examples 1 and 2 Main polymerization was carried out in the same manner as in Example 1 under the conditions shown in Table 2 except that prepolymerization was not carried out. Table 3 shows the results of measuring the polymerization and physical properties of these polypropylenes. As is clear from Table 3, the heat of fusion (ΔH
Polypropylene in which m) is within the scope of the present invention has higher flexural modulus, heat distortion temperature than those outside the range, and rigidity,
It can be seen that the heat resistance has been improved.

[0075]

[Table 1]

[0076]

[Table 2]

[0077]

[Table 3]

[0078]

As is apparent from the examples of the present invention, polypropylene having a heat of fusion (ΔHm) within the range of the present invention has a higher flexural modulus and heat deformation temperature than those outside the range, and has a higher rigidity. The heat resistance is improved, and the moldability and impact resistance are also excellent. Therefore, since the crystalline polypropylene of the present invention has high rigidity, in a molded article for the same purpose as the conventional one, it is possible to reduce the thickness and weight, and it is effective in terms of resource saving and productivity, and By improving rigidity and heat resistance, it has become possible to replace the applications that have traditionally used polystyrene, ABS resin, etc.

[Brief description of drawings]

FIG. 1 is a flowchart of the catalyst of the present invention.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihiro Nomoto 1-3-1 Nishitsurugaoka, Oi-cho, Iruma-gun, Saitama Prefecture Tonen Co., Ltd. Research Institute (72) Masatoshi Okura Nishitsurugaoka Nishi-ga, Oi-cho, Saitama Prefecture 1- 3-1 Inside Tonen Co., Ltd. (72) Inventor Masahide Murata 1-3-1 Nishitsurugaoka, Oi-cho, Iruma-gun, Saitama Inside Tonen Co., Ltd.

Claims (1)

[Claims] 1. A solid component comprising (A) a metal oxide, magnesium, titanium, a halogen and an electron-donating compound as essential components, (B) an organoaluminum compound and (C) an organosilicon compound represented by the following general formula: In the presence of R ¹ Si (OR ² ) _x (OR ³ ) _y [wherein R ¹ is an alicyclic hydrocarbon group having 5 to 7 carbon atoms, R ^1
2 is a 2-ethoxyethyl group or a 2-methyl-3-butyn-2-yl group, R ³ is a methyl group or an ethyl group, x is 1 or 2, y is 1 or 2, x + y
= 3. ] (D) α-formed by contact with olefin
A polypropylene obtained by polymerizing propylene using an olefin polymerization catalyst component, which has a weight average molecular weight (M
w) is in the range of 5,000 to 1,000,000,
A crystalline polypropylene characterized in that the heat of fusion (ΔHm) determined by differential scanning calorimetry (DSC) and Mw satisfy the relationship ΔHm ≧ 55.50-5.558 log Mw.