JPH06248132A - Propylene polymer composition - Google Patents

Abstract

(57) [Summary] [Object] To provide a highly transparent propylene-based polymer composition produced by using a catalyst system containing a solid catalyst containing magnesium, titanium, a halogen and an electron-donating compound as essential components. [Structure] (A) 99.95 to 99.6 parts by weight of a propylene polymer produced by using a Ziegler type catalyst in which a titanium compound is supported on a magnesium halide, and (B) a sorbitol compound 0.05 to 0 A propylene polymer composition containing 4 parts by weight, wherein the aluminum content is 15 ppm by weight or less and the magnesium content is 5 ppm by weight or less.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a propylene polymer composition, and more particularly to a highly transparent propylene polymer composition.

[0002]

2. Description of the Related Art In recent years, a Ziegler type catalyst system in which a halogen-containing magnesium compound and a titanium compound are used for producing polypropylene has a high activity, so that the amount of polypropylene produced per unit amount of catalyst is dramatically improved. Let As a result, the amount of catalyst remaining per unit amount of polypropylene can be considerably reduced, and the decatalyzing step is unnecessary. However, the polypropylene thus produced uses a non-supported low activity catalyst system,
There is a defect that the transparency is inferior to the polypropylene produced by decatalyzing.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a highly transparent propylene polymer composition prepared by using a catalyst system containing a solid catalyst containing magnesium, titanium, halogen and an electron donating compound as essential components. The purpose is to provide.

[0004]

DISCLOSURE OF THE INVENTION The present inventors have developed a propylene-based polymer of aluminum and magnesium using a catalyst system containing a solid catalyst containing magnesium, titanium, a halogen and an electron-donating compound as essential components. It was discovered that the transparency of a propylene polymer can be dramatically improved by further reducing the content and containing a specific sorbitol compound, and completed the present invention.

That is, the present invention relates to (A) a propylene polymer produced by using a catalyst system containing a solid catalyst component (A) magnesium, titanium, a halogen and an electron donating compound as essential components and an organometallic compound. 95-99.6
Parts by weight, and (B) sorbitol-based compound represented by the following formula (I) 0.05 to 0.4 parts by weight

[0006]

[Chemical 2] (Here, R ¹ and R ² are each independently a hydrogen atom,
Represents a halogen atom, an alkyl group, an alkoxy group, and a hydroxyl group, and m and n each independently represent an integer of 0 to 5)
In the propylene-based polymer composition containing, the aluminum content is 15 ppm by weight or less and the magnesium content is 5 ppm by weight or less.

First, in the propylene-based polymer composition of the present invention, the aluminum content is 15 ppm by weight or less,
It is preferably 10 ppm by weight or less, particularly preferably 5 ppm by weight or less. Aluminum content is 15 weight pp
When it exceeds m, the transparency of the composition is deteriorated, which is not preferable.
The magnesium content is 5 ppm by weight or less, preferably 4
It is not more than 3 ppm by weight, particularly preferably not more than 3 ppm by weight. When the magnesium content exceeds 5 ppm by weight, the transparency is deteriorated similarly to the above, which is not preferable. The transparency of the propylene-based polymer composition is influenced by both the aluminum and magnesium contents, and in order to obtain good transparency, all contents must satisfy the above conditions.

Here, the aluminum and magnesium contained in the propylene polymer composition are essentially the following components (A) magnesium, titanium, halogen and an electron donating compound used in the production of the propylene polymer. It originates in the solid catalyst component used as a component, and the catalyst system containing an organometallic compound.

In the present invention, the aluminum and magnesium contents can be reduced to the above specified amounts or less by preferably decatalyzing after the production of the component (A) propylene polymer. Examples of the decatalytic method include washing and removing the produced propylene-based polymer, preferably using a mixed solution of n-heptane / isopropyl alcohol in a 50:50 weight ratio, or isopropyl alcohol / liquid propylene. A method of washing and removing with a mixed solution may be used. Further, the aluminum and magnesium contents can be set to the above predetermined amounts without performing the above decatalysis. For example, in the production of the component (A), the magnesium content is lowered by making the polymerization time sufficiently long, preferably 3 hours or more, and the aluminum compound dissolved in the liquid propylene used in the polymerization reaction is converted into liquid propylene. Examples include a method of reducing the aluminum content rate by performing a rejection that removes in a liquid state without evaporating. In the present invention, since the aluminum and magnesium contents which are originally low due to high activity are set to the above-mentioned predetermined amounts or less, decatalysis may be performed under mild conditions as compared with the case of using a conventional non-supported catalyst system having low activity. , Economically excellent.

The component (A) propylene polymer used in the present invention is preferably a propylene homopolymer, a propylene / ethylene copolymer having an ethylene content of 0.1 to 6% by weight, or a mixture thereof. Particularly preferred is a copolymer of propylene and ethylene having an ethylene content of 0.1 to 6% by weight.

Component (A) The catalyst used for producing the propylene polymer is a catalyst system containing a solid catalyst component containing magnesium, titanium, a halogen and an electron donating compound as essential components, and an organometallic compound. In the catalyst, the composition ratio of the solid catalyst component to the organometallic compound is preferably 1 to 2,000 gram mol, and particularly preferably 20 to 1 gram atom of the organometallic compound per gram atom of titanium in the solid catalyst component.
It is 500 grams mol.

The polymerization reaction for producing the component (A) may be either a gas phase or a liquid phase. When the polymerization is carried out in the liquid phase,
Preferably normal butane, isobutane, normal pentane, isopentane, hexane, heptane, octane,
It can be carried out in an inert hydrocarbon such as cyclohexane, benzene, toluene, xylene and in a liquid monomer. The polymerization temperature is preferably -80 ° C to + 150 ° C, particularly preferably 40 to 120 ° C. The polymerization pressure may be, for example, 1 to 60 atmospheres. Further, the molecular weight of the obtained polymer is preferably adjusted by the presence of hydrogen or other known molecular weight modifier. The polymerization reaction may be carried out continuously or batchwise,
The copolymerization reaction may be carried out in one step or in two or more steps.

The solid catalyst component containing the above-mentioned magnesium, titanium, halogen and electron donating compound as essential components is, for example, as described in JP-A-63-162703.
Usually, it is prepared by bringing a magnesium compound, a titanium compound and an electron-donating compound into contact with each other, and when each compound does not have a halogen, further bringing a halogen-containing compound into contact therewith.

The magnesium compound has the general formula MgR ^a R
It is represented by ^b . Here, R ^a and R ^b represent the same or different hydrocarbon groups, OR groups (R is a hydrocarbon group), and halogen atoms. More specifically, the hydrocarbon group for R ^a and R ^b 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 is an alkyl group having 1 to 12 carbon atoms, a cycloalkyl group, an aryl group or an aralkyl group, and examples of the halogen atom include chlorine, bromine, iodine and fluorine.

Specific examples of these compounds are shown below. In the chemical formulas below, Me: methyl, Et: ethyl, Pr:
Propyl, Bu: butyl, He: hexyl, Oct: octyl, Ph: phenyl and cyHe: cyclohexyl are shown respectively. MgMe ₂ , MgEt ₂ , Mgi-Pr ₂ ,
MgBu ₂ , MgHe ₂ , MgOct ₂ , MgEtB
u, MgPh ₂ , MgcyHe ₂ , Mg (OMe) ₂ ,
Mg (OEt) ₂ , Mg (OBu) ₂ , Mg (OHe)
₂ , Mg (OOct) ₂ , Mg (OPh) ₂ , Mg (O
cyHe) ₂ , EtMgCl, BuMgCl, HeMg
Cl, i-BuMgCl, t-BuMgCl, PhMg
Cl, PhCH ₂ MgCl, EtMgBr, BuMgB
r, PhMgBr, BuMgI, EtMgCl, BuO
MgCl, HeOMgCl, PhOMgCl, EtOM
gBr, BuOMgBr, EtOMgI, MgCl ₂ ,
MgBr ₂ , MgI ₂ .

The above magnesium compound can be prepared from metallic magnesium or other magnesium compounds when the component A is prepared. As an example thereof, metal magnesium, halogenated hydrocarbon and an alkoxy group-containing compound represented by the general formula X _n M (OR) _mn (in the formula, X is a hydrogen atom, a halogen atom or a carbon number of 1 to 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), i-propyl (iP
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, aryl groups such as xylyl groups, phenethyl, and aralkyl groups such as 3-phenylpropyl. Among these, an alkyl group having 1 to 10 carbon atoms is particularly desirable. Specific examples of the alkoxy group-containing compound will be given below.

Compound wherein 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 (OM
e) ₃ , MeC (OEt) ₃ , EtC (OMe) ₃ , E
tC (OEt) ₃ , cyHeC (OEt) ₃ , PhC
(OMe) ₃ , PhC (OEt) ₃ , CH ₂ ClC (O
Et) ₃ , MeCHBrC (OEt) ₃ , MeCHCl
C (OEt) ₃ ; ClC (OMe) ₃ , ClC (OE
t) ₃ , ClC (Oi-Bu) ₃ , BrC (OE
t) ₃ ; MeCH (OM included in the formula X ₂ C (OR) ₂
e) ₂ , MeCH (OEt) ₂ , CH ₂ (OMe) ₂ ,
CH ₂ (OEt) ₂ , CH ₂ ClCH (OEt) ₂ , C
HCl ₂ CH (OEt) ₂ , CCl ₃ CH (OE
t) ₂ , CH ₂ BrCH (OEt) ₂ , PhCH (OE
t) ₂ .

Compound when M is silicon Si (OMe) ₄ , Si contained in the 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 (OP
h) ₃ ; ClSi (OMe) ₃ , ClSi (OE
t) ₃ , ClSi (OBu) ₃ , ClSi (OP
h) ₃ , BrSi (OEt) ₃ ; Formula X ₂ Si (OR) ₂
Included in Me ₂ Si (OMe) ₂ and Me ₂ Si (OE
t) ₂ , Et ₂ Si (OEt) ₂ ; MeClSi (OE
t) ₂ ; CHCl ₂ SiH (OEt) ₂ ; CCl ₃ Si
H (OEt) ₂ ; MeBeSi (OEt) ₂ : X ₃ Si
Me ₃ SiOMe, Me ₃ SiOEt contained in OR,
Me ₃ SiOBu, Me ₃ SiOPh, Et ₃ SiOE
t, Ph ₃ SiOEt.

Compound in which M is Boron B (OEt) ₃ , B (OB) included in the formula B (OR) ₃
u) ₃ , B (OHe) ₃ , B (OPh) ₃ .

Compound when M is aluminum Al (OMe) ₃ , Al contained in the 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 where M is Phosphorus P (OMe) ₃ , P (OE) included 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 Group IIIa metal (M) of the periodic table can be used. The complex has the general formula MgR ^a R ^b
represented by n (MR ^c _m). The metal is aluminum, zinc, calcium or the like, and R ^c has 1 to 1 carbon atoms.
Two alkyl groups, a cycloalkyl group, an aryl group, and an aralkyl group. Further, m is the valence of the metal M, n
Indicates a number of 0.1 to 10. MR ^c Specific examples of the compound represented by _{m, AlMe 3, AlEt 3,} Ali-
Bu ₃ , AlPh ₃ , ZnMe ₂ , ZnEt ₂ , ZnB
u ₂ , ZnPh ₂ , CaEt ₂ , CaPh _{2 and the} like can be mentioned.

The titanium compound is a divalent, trivalent or tetravalent titanium compound, and examples thereof include titanium tetrachloride, titanium tetrabromide, trichloroethoxy titanium, trichlorobutoxy titanium, dichlorodiethoxy titanium and dichlorodi. Butoxy titanium, dichlordiphenoxy titanium,
Examples thereof include chlorotriethoxy titanium, chlortributoxy titanium, tetrabutoxy titanium and titanium trichloride. Among these, tetravalent titanium halides such as titanium tetrachloride, trichloroethoxy titanium, dichlorodibutoxy titanium, and dichlorodiphenoxy titanium are preferable, and titanium tetrachloride is particularly preferable.

Examples of the electron-donating compound include carboxylic acids, carboxylic acid anhydrides, carboxylic acid esters, carboxylic acid halides, alcohols, ethers, ketones, amines, amides, nitriles, aldehydes,
Examples thereof include alcoholates, phosphorus bonded to an organic group through carbon or oxygen, arsenic and antimony compounds, phosphoamides, thioethers, thioesters and carbonic acid esters. Of these, carboxylic acids, carboxylic acid anhydrides, carboxylic acid esters, carboxylic acid 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-1,2-
Alicyclic carboxylic acids such as dicarboxylic acids, benzoic acid, toluic acid, anisic acid, p-tertiary butylbenzoic acid, naphthoic acid, aromatic monocarboxylic acids such as cinnamic acid, phthalic acid, isophthalic acid, terephthalic acid And aromatic polycarboxylic acids such as naphthalic acid, trimellitic acid, hemimellitic acid, trimesic acid, pyromellitic acid, and mellitic acid.

As the carboxylic acid anhydride, 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,
α-Ethylnaphthoate, isobutyl α-naphthoate, ethyl cinnamate, monomethyl phthalate, monobutyl phthalate, dibutyl phthalate, diisobutyl phthalate, dihexyl phthalate, dioctyl phthalate, di-2-ethylhexyl phthalate, phthalate Acid diallyl, diphenyl phthalate, diethyl isophthalate, diisobutyl isophthalate, diethyl terephthalate, dibutyl terephthalate, diethyl naphthalate, dibutyl naphthalate, triethyl trimellitate, tributyl trimellitate, tetramethyl pyromelliticate, tetraethyl pyromelliticate, pyromellitic acid Tetrabutyl etc. are mentioned.

As the carboxylic acid halide, the acid halides of the above carboxylic acids can be used,
Specific examples thereof include acetic acid chloride, acetic acid bromide, acetic acid iodide, propionic acid chloride, butyric acid chloride,
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 acid chloride, succinic acid 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 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, Examples thereof include cinnamic acid chloride, cinnamic acid bromide, phthalic acid dichloride, phthalic acid dibromide, isophthalic acid dichloride, isophthalic acid dibromide, terephthalic acid dichloride, and naphthalic acid dichloride. Also, a monoalkyl halide of a dicarboxylic acid such as adipic acid monomethyl chloride, maleic acid monoethyl chloride, maleic acid monomethyl chloride, phthalic acid butyl chloride may be used.

Alcohols are represented by the general formula ROH. In the formula, R is alkyl having 1 to 12 carbons, alkenyl, cycloalkyl, aryl or 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-tertiary-butylphenol, n-octylphenol and the like. Ethers have the general formula ROR
^Represented by a. In the formula, R and ^Ra are alkyl having 1 to 12 carbons, alkenyl, cycloalkyl, aryl,
It is aralkyl, and R and R ^a 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, ethyl phenyl ether. .

As a method for preparing a solid catalyst component containing magnesium, titanium, halogen and an electron donating compound as essential components, a magnesium compound (component 1), a titanium compound (component 2) and an electron donating compound (component 3) are used. Contact in that order. After contacting component 1 and component 3, component 2 is contacted. A method such as contacting the components 1, 2 and 3 at the same time can be adopted. It is also possible to contact with the halogen-containing compound before contacting with component 2.

Examples of the halogen-containing compound include halogenated hydrocarbons, halogen-containing alcohols, silicon halide compounds having a hydrogen-silicon bond, Group IIa of the periodic table, IVa
Examples thereof include halides of group elements and Va group elements (hereinafter referred to as metal halides).

The halogenated hydrocarbon has 1 to 10 carbon atoms.
Twelve saturated or unsaturated aliphatic, cycloaliphatic and aromatic hydrocarbon mono- and polyhalogen substitutes. Specific examples of those compounds include, in aliphatic compounds, methyl chloride, methyl bromide, methyl iodide, methylene chloride, methylene bromide, methylene iodide, chloroform, bromoform, iodoform, carbon tetrachloride, carbon tetrabromide, and tetrachloride. Carbon iodide, ethyl chloride, ethyl bromide, ethyl iodide, 1,2-dichloroethane, 1,2-dibromoethane, 1,2-diiodoethane, methyl chloroform, methyl bromoform, methyl iodoform, 1,1,2-trichloroethylene, 1,1,2-tribromoethylene, 1,1,2,2-tetrachloroethylene, pentachloroethane, hexachloroethane, hexabromoethane, n-propyl chloride, 1,2-dichloropropane,
Hexachloropropylene, octachloropropane, decabromobutane, chlorinated paraffins are alicyclic compounds, and chlorocyclopropane, tetrachlorocyclopentane,
Hexachlorocyclopentadiene and hexachlorocyclohexane are aromatic compounds such as chlorobenzene, bromobenzene, o-dichlorobenzene, p-dichlorobenzene,
Hexachlorobenzene, hexabromobenzene, benzotrichloride, p-chlorobenzotrichloride and the like can be mentioned. 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 a mono- or polyhydric alcohol having one or two or more hydroxyl groups in one molecule are substituted with a halogen atom. Means a compound. Examples of the halogen atom include chlorine, bromine, iodine and fluorine atoms, and 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) -chloro Benzyl 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-chlor-α-methylbenzyl alcohol, 2-
Chlor-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-bromoresorcin, (m, o, p) -fluorophenol, p-iodophenol: 2,2-dichloroethanol , 2,3-dichloro-1-propanol, 1,3-dichloro-2-
Propanol, 3-chloro-1- (α-chloromethyl) -1-propanol, 2,3-dibromo-1-propanol, 1,3-dibromo-2-propanol, 2,4-dibromophenol, 2,4- Dibrom-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-tribromo-4-hydroxytoluene, 2,2,2-trifluoroethanol,
α, α, α-trifluoro-m-cresol, 2,4,6-triiodophenol: 2,3,4,6-tetrachlorophenol,
Examples thereof include tetrachlorohydroquinone, tetrachlorobisphenol A, tetrabromobisphenol A, 2,2,3,3-tetrafluoro-1-propanol, 2,3,5,6-tetrafluorophenol and tetrafluororesorcin.

Examples of the silicon halide compound having a hydrogen-silicon bond include HSiCl ₃ , H ₂ SiCl ₂ , H ₃ S
iCl, HCH ₃ SiCl ₂ , HC ₂ H ₅ SiCl ₂ ,
_{H (t-C 4 H 9} ) SiCl 2, HC 6 H 5 SiCl 2,
H (CH ₃ ) ₂ SiCl, H (i-C ₃ H ₇ ) ₂ SiC
1, H ₂ C ₂ H ₅ SiCl, H ₂ (n-C ₄ H ₉ ) SiC
1, H ₂ (C ₆ H ₄ CH ₃ ) SiCl, HSiCl (C
₆ H ₅ ) _{2 and the} like.

As the metal halide, B, Al, Ga,
In, Tl, Si, Ge, Sn, Pb, As, Sb, B
Examples thereof include chlorides, fluorides, bromides and iodides of i, particularly BCl ₃ , BBr ₃ , BI ₃ , AlCl ₃ and AlBr.
₃ , GaCl ₃ , GaBr ₃ , InCl ₃ , TlC
l ₃ , SiCl ₄ , SnCl ₄ , SbCl ₅ , SbF ₅
Etc. are suitable.

The contact with Component 1, Component 2 and Component 3, and optionally with a halogen-containing compound which can be optionally contacted is carried out by mixing and stirring in the presence or absence of an inert medium, but mechanically. It is made by co-milling. The contact can be performed under heating at 40 to 150 ° C.

As the inert medium, saturated aliphatic hydrocarbons such as hexane, heptane and octane, saturated alicyclic hydrocarbons such as cyclopentane and cyclohexane, and aromatic hydrocarbons such as benzene, toluene and xylene can be used. .

A preferable method for preparing a solid catalyst component containing magnesium, titanium, halogen and an electron-donating compound as essential components in the present invention is disclosed in JP-A-63-264607 and JP-A-58-1.
This method is disclosed in, for example, 98503 and 62-146904. More specifically, it is obtained by bringing (a) metallic magnesium, (b) a halogenated hydrocarbon, and (c) a compound of the general formula X _n M (OR) _mn (the same as the above-mentioned alkoxy group-containing compound) into contact with each other. A method in which a magnesium-containing solid is brought into contact with (d) a halogen-containing alcohol, and then a (e) electron donating compound and (f) titanium compound (JP-A-63-2).
64607), (a) after contacting a magnesium dialkoxide with a (b) silicon halide compound having a hydrogen-silicon bond,
(C) A method in which a titanium halide compound is brought into contact, and then (d) an electron-donating compound is brought into contact (if necessary, further brought into contact with a titanium halide compound)
62-146904), (a) after contacting a magnesium dialkoxide with a (b) silicon halide compound having a hydrogen-silicon bond,
(C) Method of contacting with electron donating compound and then contacting with (D) titanium compound (JP-A-58-198503)
Is.

Among these, the most preferable method is the most preferable one.

As described above, magnesium, titanium,
A solid catalyst component containing a halogen and an electron-donating compound as essential components is prepared, and the solid catalyst component may be washed with the above-mentioned inert medium, if necessary, and further dried.

Further, the solid catalyst component may further contain a propylene-based polymer produced in the solid catalyst component by contacting with propylene and ethylene in the presence of the organoaluminum compound. The organoaluminum compound is selected from the organometallic compounds described below, which are one component of the catalyst of the present invention.

The contact with propylene and ethylene is preferably carried out in the presence of the above-mentioned inert medium. Contact is usually 1
It is carried out at a temperature of 00 ° C or lower, preferably -10 to + 50 ° C. The amount of the propylene-based polymer contained in the solid catalyst component is usually 0.1 to 100 per gram of the solid catalyst component.
It is gram.

For contacting the solid catalyst component with propylene or ethylene, an electron donating compound may be present together with the organoaluminum compound. The electron-donating compound is a compound used in preparing a solid catalyst component or Si-O-C.
It is selected from organic silicon compounds having a bond or a Si-NC bond. The solid catalyst component contacted with propylene and ethylene can be washed with the above-mentioned inert medium, if necessary, and can be further dried.

Organometallic compounds are group I to group I of the periodic table.
It is an organic compound of Group III metal. As the organic metal compound, organic compounds of lithium, magnesium, calcium, zinc and aluminum can be used. Among these, organoaluminum compounds are particularly preferable. The organoaluminum compound that can be used is 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 ≦
It is an arbitrary number in the range of n ≦ 3. ), For example, a trialkylaluminum, a dialkylaluminum monohalide, a monoalkylaluminum dihalide, an alkylaluminum sesquihalide, a dialkylaluminum monoalkoxide, a dialkylaluminum monohydride and the like having 1 to 18 carbon atoms.
Particularly preferred are alkylaluminum compounds, preferably C2 to C6 or mixtures or complex compounds thereof. Specifically, 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,
Dialkyl aluminum monohalide such as diisobutyl aluminum chloride, methyl aluminum dichloride, ethyl aluminum dichloride, methyl aluminum dibromide, ethyl aluminum dibromide, ethyl aluminum diiodide, monoalkyl aluminum dihalide such as isobutyl aluminum dichloride, ethyl aluminum sesquichloride, etc. Alkyl aluminum sesquihalide, dimethyl aluminum methoxide, diethyl aluminum ethoxide, diethyl aluminum phenoxide, dipropyl aluminum ethoxide, diisobutyl aluminum ethoxide, diisobutyl aluminum phenoxide and other dialkyl aluminum monoalkoxides, dimethyl aluminum hydride, diethyl ether Aluminum hydride, dipropyl aluminum hydride, dialkyl aluminum hydride such as diisobutyl aluminum hydride. Among these, trialkylaluminums, particularly triethylaluminum and triisobutylaluminum are preferable. In addition, these trialkylaluminums are other organoaluminum compounds, for example, industrially easily available diethylaluminum chloride, ethylaluminum dichloride, ethylaluminum sesquichloride, diethylaluminum ethoxide, diethylaluminum hydride or a mixture or complex thereof. It can be used in combination with a compound or the like.

It is also possible to use an organoaluminum compound in which two or more aluminum atoms are bound to each other through an oxygen atom or a nitrogen atom. Such compounds include, for example:
(C ₂ H ₅ ) ₂ AlOAl (C ₂ H ₅ ) ₂ , (C
_{4 H 9) 2 AlOAl (C} 4 H 9) 2, (C 2 H 5) 2
Examples include AlN (C ₂ H ₅ ) Al (C ₂ H ₅ ) _{2 and the} like.

Examples of organic compounds of metals other than aluminum metal include diethylmagnesium, ethylmagnesium chloride and the like, LiAl (C ₂ H ₅ ) ₄ and LiAl (C
₇ H ₁₅ ) _{4 and the} like.

Further, the catalyst system used in the present invention may contain an organosilicon compound in addition to the solid catalyst component and the organometallic compound containing the above-mentioned magnesium, titanium, halogen and electron donating compound as essential components. . Examples of the organic silicon compound include diphenyldimethoxysilane, dimethyldimethoxysilane, methyltrimethoxysilane, ethyltriethoxysilane, propylpolyethoxysilane, and phenylpolyethoxysilane.

The component (B) sorbitol compound used in the present invention is represented by the chemical formula (I). Here, in R ¹ and R ² in the chemical formula (I), the halogen atom is preferably a chlorine atom or a bromine atom, and the alkyl group is preferably a lower alkyl group having 1 to 4 carbon atoms, for example, a methyl group, An ethyl group or the like is shown, and the alkoxy group preferably has 1 to 4 carbon atoms, and is, for example, a methoxy group, an ethoxy group or the like. Examples of the sorbitol compound include:
1,3,2,4-dibenzylidene sorbitol, 1,3,2,4-di (paramethylbenzylidene) sorbitol, 1,3,2,4-di (paraethylbenzylidene) sorbitol, 1,3,2, 4-di (parachlorobenzylidene) sorbitol and the like can be mentioned.

In the composition of the present invention, the compounding ratio of the component (A) and the component (B) is 0.05 to 0.4 parts by weight of (B) with respect to 99.95 to 99.6 parts by weight of (A). Parts, preferably (A) 99.9 to 99.6 parts by weight, relative to (B) 0.
1 to 0.4 parts by weight, particularly preferably (A) 99.9 to 9
(B) is 0.1 to 0.3 parts by weight with respect to 9.7 parts by weight. The blending amount of the component (B) sorbitol compound is
If it is less than 0.05 part by weight, the transparency of the propylene polymer composition cannot be improved, and if it exceeds 0.4 part by weight, problems such as bleeding occur, which is not preferable.

Further, in the resin composition of the present invention, an antioxidant and a neutralizing agent may be added in addition to the above components in order to improve transparency.

The antioxidant is preferably contained in the resin composition in an amount of 0.05 to 0.4 parts by weight, particularly preferably 0.1 to 0.
It can be included in 3 parts by weight. If the addition amount is less than 0.05 parts by weight, the problem of resin deterioration will occur, and if it exceeds 0.4 parts by weight, problems such as bleeding and coloring will occur, which is not preferable. Examples of the antioxidant include 2,6-di-t-butylhydroxytoluene, 1,1,3-tris (2-methyl-4-hydroxy-5-t-butylphenyl) butane, tetrakis [methylene-3 -(3,5-di-t-butyl-4-hydroxyphenyl)
Propionate] methane, 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene, n-octadecyl-β- (4'-hydroxy-3 ', 5'-
-t-butylphenol) propionate, tris (3,5-
Di-t-butyl-4-hydroxybenzyl) isocyanurate, 1,3,5-tris- (4-t-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanuric acid, d, l-α-tocopherol Phenolic antioxidants such as 4,4'-butylidene-bis (3-methyl-6-t-butylphenyl-di-tridecyl) phosphite, 1,1,3-tris (2-methyl-4-) Ditridecylphosphite-5-t-butylphenyl) butane, tetrakis (2,4-di-t-butylphenyl) -4,4'-biphenylene diphosphonite, tris (2,4-di-t-butylphenyl) ) Phosphite-based antioxidants such as phosphite and tri (mono- and di-nonylphenyl) phosphite.

The neutralizing agent is preferably contained in 0.02 to 0.2 part by weight, particularly preferably 0.05 to 0.2 part by weight. If the addition amount is less than 0.02 parts by weight, the problem of resin deterioration will occur, and if it exceeds 0.2 parts by weight, problems such as bleeding will occur, which is not preferable. Examples of the neutralizing agent include lithium, sodium, potassium, calcium and zinc stearates, lithium and calcium salts of 12-hydroxystearic acid, sodium and calcium lauric acid salts, calcium stearyl lactylate, and hydrotalcite. Is mentioned.

In the resin composition of the present invention, in addition to the above-mentioned components, various additives known to those skilled in the art, such as lubricants, antistatic agents, etc. An ultraviolet absorber, a light stabilizer and the like can be further added.

The method for producing the propylene polymer composition of the present invention is not particularly limited, and a generally known method can be adopted. For example, a method of blending the components (A) and (B) and, if necessary, other components and melt-kneading with a uniaxial or multiaxial extruder having a sufficient kneading capacity can be employed. The pellets produced in this way can be used for compression, injection, extrusion, film forming and the like.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

[0057]

【Example】

[0058]

Examples 1 to 3 The following compounds were used in the examples.

Component (A): Propylene-based polymer It was produced as follows. (A) Preparation of solid catalyst component containing magnesium, titanium, halogen, and electron-donating compound as essential components A 1-liter reaction vessel equipped with a reflux condenser was placed under a nitrogen gas atmosphere to produce chip-shaped metallic magnesium (purity: 99.5 %
, Average particle size 1.6 mm) 8.3 g and n-hexane 250
After adding milliliter and stirring at 68 ° C. for 1 hour, metallic magnesium was taken out and dried under reduced pressure at 65 ° C. to obtain pre-activated metallic magnesium. next,
To this metal magnesium, 140 ml of n-butyl ether and 0.5 ml of an n-butyl ether solution of n-butyl magnesium chloride (1.75 mol / liter) were added, and the resulting suspension was kept at 55 ° C. N-Butyl chloride 38.
A solution in which 5 ml was dissolved was added dropwise over 50 minutes.
After reacting at 70 ° C for 4 hours with stirring, the reaction solution is cooled to 25 ° C.
Held in.

Next, HC (OC ₂ H ₅ ) was added to this reaction solution.
₃ 55.7 ml was dripped in 1 hour. After completion of the dropping, the reaction was carried out at 60 ° C. for 15 minutes, the reaction product solid was washed 6 times with 300 ml of n-hexane each time, and dried under reduced pressure at room temperature for 1 hour to obtain magnesium of 19.0% and chlorine of 2%.
31.6 grams of a magnesium-containing solid containing 8.9% was recovered.

In a 300 ml reaction vessel equipped with a reflux condenser, a stirrer and a dropping funnel, 6.3 g of magnesium-containing solid and 50 ml of n-heptane were placed in a nitrogen gas atmosphere to prepare a suspension, which was stirred at room temperature. Meanwhile, a mixed solution of 20 ml (0.02 mmol) of 2,2,2-trichloroethanol and 11 ml of n-heptane was added dropwise from the dropping funnel in 30 minutes, and further 80
The mixture was stirred at 0 ° C for 1 hour. The solid obtained is filtered and n-
The solid component was obtained by washing four times with 100 ml of hexane each time and twice with 100 ml of toluene each time.

40 ml of toluene was added to the above solid component, and the volume ratio of titanium tetrachloride / toluene was 3 /.
Titanium tetrachloride was added to reach 2 and the temperature was raised to 90 ° C. With stirring, a mixed solution of 2 ml of di-n-butyl phthalate and 5 ml of toluene was added dropwise over 5 minutes.
The mixture was stirred at 120 ° C for 2 hours. 90% of the obtained solid substance
Filter off at ℃, 2 times with 100 ml of toluene each time, 9
Washed at 0 ° C. Furthermore, titanium tetrachloride is added so that the volume ratio of titanium tetrachloride / toluene is 3/2, and 1
The mixture was stirred at 20 ° C for 2 hours. The solid substance obtained is heated to 110 ° C.
The crystals were separated by filtration and washed 7 times with 100 ml of n-hexane at room temperature. Thus, 5.5 g of a solid catalyst component having a titanium compound supported on magnesium chloride was obtained. (B) Copolymerization of Propylene / Ethylene 32.0 mg of the above solid catalyst component, 1.2 mmol of triethylaluminum, 0.24 mmol of diphenyldimethoxysilane and n were added to a 5 liter autoclave which had been purged with nitrogen and sufficiently dried. -Add 7 ml heptane and hold for 5 minutes. Next, 8.0 liters of hydrogen gas as a molecular weight control agent (standard state), 3 liters of liquid propylene and 5.85 of ethylene.
After pressurizing gram, the internal temperature of the autoclave is 70 ℃.
The temperature was raised to 0 to carry out polymerization. 0.4 per minute ethylene during polymerization
It was continuously fed into the system at a rate of gram. After 1 hour, unreacted propylene, ethylene and hydrogen were purged, and then 2 liters of a mixed solution of n-heptane / isopropyl alcohol in a weight ratio of 50:50 was introduced into the system without touching air. The internal temperature of the autoclave was raised to 70 ° C., and after stirring for 30 minutes, the supernatant of the internal solution was decanted and removed. The decatalysis operation using this n-heptane / isopropyl alcohol mixed solution was repeated twice. The polymer was taken out from the autoclave and dried.

The total weight of the resulting polymer was 817 grams, melt flow rate (MFR, ASTM D-12
38) was 14.5 grams / 10 minutes. The ethylene content was 3.07% by weight.

Component (B): sorbitol type compound 1,3,2,4-di (paramethylbenzylidene) sorbitol:
Gelall MD (trademark, manufactured by Shin Nippon Rika Co., Ltd.) Optional components: Compound (a): Antioxidant 2,6-di-t-butylhydroxytoluene (Sumitomo Chemical Co., Ltd.) Compound (b): Antioxidant Tetrakis (Methylene-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate) methane: Ir1010
(Trademark, manufactured by Ciba Geigy Co., Ltd.) Compound (c): Neutralizing agent Calcium stearate (manufactured by Nitto Kagaku Co., Ltd.) A 30 mmφ twin-screw extruder (TEX30XSST, manufactured by Nippon Steel) (Manufactured by Mitsui Chemical Co., Ltd.) was used to knead and extrude at a barrel setting temperature of 200 ° C. and a rotation speed of 200 rpm to prepare pellets. The resulting pellets were molded by an injection molding machine set to a cylinder temperature of 250 ° C. and a mold temperature of 60 ° C. to prepare test pieces of 80 × 80 × 2 mm, and the transparency was measured.

Transparency (Haze) is JIS K 710
It was measured according to 5-1981.

The contents of magnesium and aluminum are
It was measured by the ion chromatography method after combustion ashing.

[0067]

Example 4 Component (A): Propylene-based polymer It was produced as follows. (A) Solid catalyst component containing magnesium, titanium, halogen and an electron donating compound as essential components The same catalyst component as that prepared in Examples 1 to 3 was used. (B) Copolymerization of Propylene / Ethylene Into a 5 liter autoclave that had been purged with nitrogen and sufficiently dried, 5.0 mg of the above solid catalyst component, 1.0 mmol of triethylaluminum, 0.20 mmol of diphenyldimethoxysilane and n -Add 7 ml heptane and hold for 5 minutes. Next, 8.0 liters of hydrogen gas as a molecular weight control agent (standard state),
After 3 liters of liquid propylene and 5.85 g of ethylene were press-fitted, the internal temperature of the autoclave was raised to 70 ° C. to carry out polymerization. During the polymerization, ethylene was continuously fed into the system at a rate of 0.06 g / min. After 6 hours, unreacted propylene and the like were decanted in a liquid state, and then the polymer was taken out from the autoclave and dried.

The total weight of the polymer obtained was 753 grams, melt flow rate (MFR, ASTM D-12
38) was 16.3 grams / 10 minutes. The ethylene content was 3.21% by weight.

The amounts (parts by weight) of the components shown in Table 1 were blended, and test pieces were prepared using the same conditions and apparatus as in Examples 1 to 3, and the transparency was measured. The contents of magnesium and aluminum were measured.

[0070]

[Comparative Examples 1 and 2] In the copolymerization operation of propylene / ethylene, Examples 1 to 3 were performed except that the decatalysis operation with the n-heptane / isopropyl alcohol mixed solution was not performed.
A polymer was produced in the same manner as in. Next, the amounts (parts by weight) of each component shown in Table 1 were blended, a test piece was prepared using the same conditions and devices as in Examples 1 to 3, and the transparency was measured. The contents of magnesium and aluminum were measured.

[0071]

Comparative Example 3 In the propylene / ethylene copolymerization operation, after the reaction was completed, unreacted propylene and the like were not decanted in a liquid state, unreacted propylene, ethylene and hydrogen were purged, and then the polymer was taken out from the autoclave and dried. A polymer was produced in the same manner as in Example 4 except for the above. Next, the amounts (parts by weight) of each component shown in Table 1 were blended, a test piece was prepared using the same conditions and devices as in Examples 1 to 3, and the transparency was measured. The contents of magnesium and aluminum were measured.

[0072]

[Comparative Example 4] In a copolymerization operation of propylene / ethylene, a polymer was prepared in the same manner as in Examples 1 to 3 except that after the reaction was completed, unreacted propylene and the like were decanted in a liquid state, and the polymer was taken out from the autoclave and dried. Was manufactured. Next, the amounts (parts by weight) of each component shown in Table 1 were blended, a test piece was prepared using the same conditions and devices as in Examples 1 to 3, and the transparency was measured. The contents of magnesium and aluminum were measured.

[0073]

[Comparative Example 5] Component (A): propylene-based polymer It was produced as follows. (A) Preparation of catalyst The catalyst used in Comparative Example 5 was the same as the catalyst described in Example 1 of JP-A-52-107294, and was produced by the same method. That is, a 2 liter flask equipped with a stirrer was placed in a constant temperature water bath kept at 0 ° C.,
Add 700 ml of purified heptane and 2 to the flask.
Fifty milliliters of titanium tetrachloride was added and mixed. Then, while maintaining the temperature of this heptane solution of titanium tetrachloride at 0 ° C., 315 ml of diethyl aluminum chloride (corresponding to 1.1 mol per 1 mol of titanium tetrachloride), 117 ml of ethyl aluminum dichloride (four A mixture of 400 mol of purified heptane and 0.5 mol of titanium chloride) was mixed dropwise over 3 hours. After the dropping is completed, the contents are heated with stirring and 1 hour later, 65 ° C.
And further stirred at this temperature for 1 hour to obtain a reduced solid. The reduced solid obtained was separated, washed with purified heptane, and then dried under reduced pressure at 65 ° C. for 30 minutes. The reduced solid obtained here has a reddish purple color, and the peak at 2θ = 42.4 degrees (β-type crystal) in the X-ray diffraction spectrum is 2θ = 5.
It is considerably smaller than the peak at 1.3 degrees (δ type). Next, a suspension is prepared by dispersing 25 grams of this reduced solid in 100 milliliters of purified heptane, and then, in this suspension, an amount of hexachloroethane corresponding to 1 mol of hexachloroethane per 1 gram atom of titanium in the reduced solid is prepared. Chlorethane 10
The solution was added in the form of a solution containing 25 g of hexachloroethane in 0 ml, and further an amount of dinormal butyl ether corresponding to 0.6 mol per 1 g atom of titanium in the reduced solid was added and mixed with stirring.

Next, the mixed solution is heated with stirring to 80
After keeping the temperature at 5 ° C. for 5 hours, a titanium trichloride catalyst was obtained. The titanium trichloride catalyst thus obtained was further washed 5 times with 100 ml of purified heptane and then dried at 65 ° C. for 30 minutes to obtain titanium trichloride catalyst powder as titanium in a yield of 95%.

The titanium trichloride catalyst thus obtained is an aluminum compound corresponding to 0.0019 gram atom of aluminum per gram atom of titanium, 0.02.
It contained 3 mol of di-n-butyl ether and 0.011 mol of hexachloroethane. (B) Copolymerization of Propylene / Ethylene 100 mg of the above titanium trichloride catalyst was added to a 5 liter autoclave that had been thoroughly purged with nitrogen.
Diethyl aluminum chloride 12 mmol and n-
7 ml of heptane was mixed and held for 5 minutes. Then, 6.4 liters of hydrogen gas (standard state) as a molecular weight control agent, 3 liters of liquid propylene and 5.85 g of ethylene were injected under pressure, and then the internal temperature of the autoclave was raised to 70 ° C. to carry out polymerization. During the polymerization, ethylene was continuously fed into the system at a rate of 0.4 g / min. After 1 hour, unreacted propylene, ethylene and hydrogen were purged, and then 2 liters of a mixed solution of n-heptane / isopropyl alcohol in a weight ratio of 50:50 was introduced into the system without touching air. The internal temperature of the autoclave was raised to 70 ° C., and after stirring for 30 minutes, the supernatant of the internal solution was decanted and removed. The decatalysis operation using this n-heptane / isopropyl alcohol mixed solution was repeated twice. The polymer was taken out from the autoclave and dried.

The total weight of the polymer obtained was 807 grams, melt flow rate (MFR, ASTM D-12
38) was 14.8 grams / 10 minutes. The ethylene content was 3.15% by weight.

The amounts (parts by weight) of the components shown in Table 1 were blended, and test pieces were prepared using the same conditions and apparatus as in Examples 1 to 3, and the transparency was measured. The contents of magnesium and aluminum were measured.

The evaluation results of Examples 1 to 4 and Comparative Examples 1 to 5 are shown in Table 1 above.

[0079]

[Table 1] Table 1 Example Comparative Example 1 2 3 4 1 2 3 4 5 Component (A) 99.7 99.7 99.65 99.7 99.7 99.65 99.7 99.7 99.7 Component (B) 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Arbitrary component: Compound ( a) 0.1-0.1 0.1 0.1 0.1 0.1 0.1 0.1 Compound (b)-0.1-------Compound (c)--0.05--0.05---Content rate (ppm by weight) Mg 1.8 1.8 1.8 1.2 8.4 8.4 1.2 8.2-Al 3.2 3.2 3.2 12 54 54 50 13-Haze,% 20.5 21.5 20.7 23.2 34.0 30.6 32.3 27.1 19.8

In the compositions of Examples 1 to 3 which were decatalyzed as shown in Table 1, the magnesium and aluminum contents were both below the predetermined values, and Comparative Example 1 in which decatalysis was not carried out Compared with the composition of No. 2, the transparency was dramatically improved. The composition of Example 4 had a sufficiently long polymerization time to lower the magnesium content and the aluminum content by rejection, and the transparency was also good. On the contrary,
In Comparative Example 3, the rejection was not performed, so the aluminum content was higher than that in Example 4, and the transparency was poor. Comparative Example 4 does not undergo decatalysis, and therefore has poorer transparency than Example 1. Further, since the polymerization time is short, the magnesium content is high and the transparency is poor as compared with Example 4. It was found that in Comparative Examples 3 and 4, the transparency was poor, and good transparency could not be obtained unless the magnesium and aluminum contents were both equal to or less than the above predetermined values. Comparative Example 5 is a composition prepared by decatalyzing a non-supported catalyst. Compared with the composition of Comparative Example 5, the compositions of Examples 1 to 4 were almost the same in transparency and were sufficiently satisfactory.

[0081]

The propylene-based polymer composition of the present invention is
Excellent transparency.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Satoshi Ueki 1-3-3 Nishitsurugaoka, Oi-cho, Iruma-gun, Saitama Tonen Research Institute

Claims (1)

[Claims] 1. A propylene-based polymer produced by using a catalyst system containing (A) a solid catalyst component containing magnesium, titanium, a halogen, and an electron-donating compound as essential components and an organometallic compound, 99.95 to 99. 6 parts by weight, and (B) a sorbitol compound represented by the following formula (I)
0.05 to 0.4 parts by weight (Here, R ¹ and R ² are each independently a hydrogen atom,
Represents a halogen atom, an alkyl group, an alkoxy group, and a hydroxyl group, and m and n each independently represent an integer of 0 to 5)
A propylene-based polymer composition containing, wherein the aluminum content is 15 ppm by weight or less and the magnesium content is 5 ppm by weight or less.