JPH02272045A - Propylene polymer composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to improving the properties of crystalline propylene polymers, particularly those passed through extrusion molded products such as sheets, films, and blow bottles.
The present invention relates to a propylene polymer composition with significantly improved transparency and stiffness.

[Conventional technology 1] Propylene polymer is a general-purpose resin that has excellent moldability, heat resistance, and mechanical properties, as well as chemical stability. Extruded products such as , blow bottles, etc. are used as various packaging materials.

However, propylene polymers have the drawback of being significantly inferior in transparency and rigidity compared to other highly transparent thermoplastic resins (especially polystyrene, polyvinyl chloride, etc.).

In recent years, a method of adding a crystal nucleating agent has generally been used to improve the transparency and rigidity of propylene polymers. As a crystal nucleating agent, talc, carboxylic acid or its salt (
JP-A No. 58-80329), organic phosphoric acid compounds,
Dibenzylidene sorbitol and its derivatives
5-12460, JP-A-58-129036), etc. are known. In addition, there are other polymer nucleating agents (Japanese Unexamined Patent Publication No. 6
No. 0-139710! &1) have also been proposed.

[Problem to be solved by the invention 1 However, when talc or carboxylic acid is blended into propylene polymer, the effect of improving transparency and rigidity is small;
Further, when a metal salt of carboxylic acid or an organic phosphoric acid compound is blended, there is a problem in dispersibility, and when a thin extrusion molded product of 1 ms or less is formed, lumps may occur.

Furthermore, it is known that propylene polymers containing dibenzylidene sorbitol are the most effective in improving transparency and rigidity, but dibenzylidene sorbitol bleeds and contaminates molding equipment such as cooling rolls. There are some problems.

Furthermore, when a polymer nucleating agent is blended with a propylene polymer, there is no problem of bleeding, but the effect of improving transparency and rigidity is low, and it is currently not practical.

In order to widen the use of propylene polymers, it is necessary to improve their transparency and rigidity.The object of the present invention is to provide propylene polymers with improved transparency and rigidity that do not have the above-mentioned disadvantages, especially in extrusion molding. To provide a combined composition.

[Means for Solving the Problem J] From this point of view, the inventors of the present invention have conducted intensive studies to improve the transparency and rigidity of extruded products of propylene polymers, and as a result, they have found that 5 a small amount of a specific polymer is blended into a propylene polymer. The present invention was completed based on the discovery that by this simple method, transparency and rigidity were unexpectedly improved, and there was no problem of bleeding or lumps occurring during extrusion molding.

That is, the present invention is a composition formed by blending the following A and B, and crushes 3-methyl-I-butene by o, ooot to 1
This is a propylene polymer composition with excellent transparency and rigidity, characterized in that it is expressed as % by weight.

A, a crystalline propylene polymer with a melt flow rate of 0.1 to 200 g/10 min B, a solid titanium catalyst component containing halogen-containing magnesium, halogen-containing titanium, and an electron-donating compound as essential components, and an organoaluminum compound; 3-Methyl-! obtained by polymerization in the presence of a catalyst formed from ! - A propylene copolymer with a butene content of 0.001 to xolf 1% and a melt flow rate of 0.1 to 200 g/IO ([)A component The crystalline propylene polymer of the above A component used in the present invention has a melt flow rate (hereinafter abbreviated as MFR) of 0.1 to 200g710 minutes, preferably 03 to f0.
0 g/10 min, boiling n-hebutane extraction residue (isotactic index, hereinafter referred to as II
A propylene homopolymer having crystallinity, which contains 85% or more, preferably 90% or more, or 60% II
or more, preferably 85% or more.

A crystalline propylene copolymer containing ethylene and containing fflLffim% or less or other α-olefins containing ff15% or less, or a mixture thereof, is suitable.

If the VFR is below the above range, the molding speed will decrease,
Anything higher than 0.3 to 3 is unsuitable for extrusion molding because the melt tension is insufficient and it tends to sag during secondary processing such as thermoforming, and the impact resistance is also low.
0g710min, especially 0.5-10g710min is preferable.

(2) Component B °Titanium catalyst 1 The solid titanium catalyst component used in the production of the propylene copolymer as component B used in the present invention contains halogen-containing magnesium, halogen-containing titanium, and an electron-donating compound as essential components. That is. Here, "making it an essential component" means not only that the solid titanium catalyst component consists only of these three specific components, but also that the solid titanium catalyst component at least maintains the effect of the combination of these three components, or This means that additional ingredients may be included unless otherwise specified. Such additional components are, for example, halogen-containing silicon compounds.

Halogen-containing magnesium The above-mentioned halogen-containing magnesium is preferably a dihalide, and magnesium chloride, magnesium bromide, and magnesium iodide can be used. Particularly preferably it is magnesium chloride, more preferably substantially anhydrous.

In addition, this halogen-containing magnesium can be used as an electron-donating compound such as magnesium oxide, magnesium hydroxide, hydrotalcite, magnesium carboxylate, alkoxymagnesium, allyloxymagnesium, alkoxymagnesium halide, allyloxymagnesium halide, and organomagnesium compounds. , herosilane, alkoxysilane, silanol, an aluminum compound, a halogenated titanium compound, a titanium tetraalkoxide, or the like.

Halogen-Containing Titanium Halogen-containing titanium is typically trivalent and tetravalent titanium halogen compounds. Preferred titanium halogen compounds are compounds represented by the general formula % (where RGfC, a hydrocarbon residue of ~C1°, X is a halogen), where n=0.1 or 2, and It is a halogenated titanium compound with high valence. Specifically, T
I(:14, TtfOBulCL+, Ti(OB
Examples thereof include titanium tetrahalides and monoalkoxytrihalogenated titanium compounds such as TiC1a and Tl fOBu) C13.

Electron-donating compound The electron-donating compound is normally used as a modifier for Ziegler type catalysts, and in the present invention, any compound can be selected and used according to the purpose.

Preferred electron-donating compounds to be used as the so-called "internal donor" in the present invention include esters of polyfunctional compounds selected from the group consisting of polycarboxylic acids, polyhydric alcohols, and hydroxy-substituted carboxylic acids, and organosilicon compounds. It is.

(Polyfunctional compound ester) Suitable esters of polyfunctional compounds are those represented by the following formula, for example.

R'-C-COOR R'-C-OCOR'' Here, R' is a substituted or unsubstituted hydrocarbon group, and R
", R3 and R4 are each independently hydrogen or a substituted or unsubstituted hydrocarbon group, and R'" and R6 are hydrogen or a substituted or unsubstituted hydrocarbon group, preferably at least one of which is substituted. Or it is an unsubstituted hydrocarbon group. R3 and R4 may be connected to each other, and the substituted hydrocarbon group here includes N, 0
, S etc. 2 containing a different atom such as -C-0-C-,
-CDOI? , -C()011.

-01l, -3OaH, -C-FC-, -N11□
Some have groups such as.

Particularly preferred among these are diesters of dicarboxylic acids in which at least one of 11' and R'' is an alkyl group having 2 or more carbon atoms.

Specific examples of preferable polyvalent carbononic acid esters include (a) diethyl succinate, dibutyl succinate, diethyl methylsuccinate, isobutyl a-methylglutarate, dibutyl methylmalonate, diethyl malononate, diethyl ethylmalonate, isopropyl Diethyl malonate, butyl diethyl malonate.

Diethyl phenylmalonate, diethyl diethylmalonate, diethyl allylmalonate, diethyl diisobutylmalonate, diethyl di-n-butylmalonate, dimethyl maleate, monooctyl maleate, dioctyl maleate, dibutyl maleate, butyl dibutyl maleate, butyl maleate Aliphatic polycarboxylic acid esters such as diethyl acid, diisopropyl β-methylglutarate, diallyl ethylsuccinate, di-2-ethylhexyl fumarate, diethyl italonate, dibutyl italonate, dimethyl citraconate, dimethyl citraconate, etc. (b) 1. Diethyl 2-cyclohexanecarboxylate, 1
．． Aliphatic polycarboxylic acid esters such as diisobutyl 2-cyclohexanecarboxylate, diethyl tetrahydrophthalate, diethyl nadic acid.

(c) Monoethyl phthalate, dimethyl phthalate, methylethyl phthalate, monoisobutyl phthalate, mononormal butyl phthalate, diethyl phthalate, ethylisobutyl phthalate, ethyl normal butyl phthalate, monoethyl phthalate, diisobutyl phthalate 2 Di-n-heptyl phthalate, di-2-ethylhexyl phthalate, di-n phthalate
- Chill talented.

dineobentyl phthalate, didecyl phthalate, benzylbutyl phthalate, diphenyl phthalate, diethyl naphthalene dicarboxylate, dibutyl naphthalene dicarboxylate,
Triethyl trimellitate.

Aromatic polycarboxylic acid esters such as dibutyl trimellitate.

(d) Tatsumi carbon polycarboxylic acid ester with 3,4-furandicarboxylic acid and the like can be mentioned.

Among these polyfunctional esters, preferred are those having the skeleton of the general formula described above, and more preferred are esters of phthalic acid, maleic acid, substituted malonic acid, etc., and alcohols having 2 or more carbon atoms. Particularly preferred is a diester of phthalic acid and an alcohol having 4 or more carbon atoms.

(Organosilicon compound) As the organosilicon compound, an organosilicon compound represented by the following formula is used.

R'R'3-R5I ((IR'J n where R7 is a branched hydrocarbon residue, ne and R9 are each a branched or linear hydrocarbon residue, n is a number of 2≦1≦3) It is.

R? is preferably branched from a carbon atom adjacent to a silicon atom. In that case, the branching group is preferably an alkyl group, a cycloalkyl group, or an aryl group (e.g., a phenyl group or a methyl-substituted phenyl group). More preferably, 87 is a carbon atom adjacent to two silicon atoms, i.e., -(,7). The carbon atom is a secondary or tertiary carbon atom.

Particularly preferred are those having a structure in which three alkyl groups extend from a carbon atom bonded to a silicon atom. The number of carbon atoms in R7 is usually 3 to 20, preferably 4 to 10.

R''' is usually a branched or linear aliphatic hydrocarbon group having 1 to 20 carbon atoms, preferably 4 to 10 carbon atoms.R9 is an aliphatic hydrocarbon group, preferably having 1 to 4 carbon atoms.
The following is a horizontal representation of specific examples of organosilicon compounds.

CL IIc fclIa) af
clIal :IC-5t fOcIlsl-1fCl
laJ-C-3i (OCII-)2.

CI'ls C1hf
cl131.1C-5i (OC, 1IS1.,
fc211. l 3C-3i (OC113+2(
1:113 C11゜Ca1゜C11゜C (1゜Ca11゜\ +ct+tsl 3C-3r fOc211sl 3
.

C11-5i fOcl1313, C11°C11°fclI-) 3cmSi fOclIsl 5, fc
ll,l,C-3i (OCzll,l 3In the present invention, either the ester of the above-mentioned polyfunctional compound and the organosilicon compound, or a combination of both can be used as the "internal donor".

Moreover, the above-mentioned organosilicon compounds can also be used as an "external donor" if necessary.

Aluminum A The aluminum compound used in the production of the propylene copolymer which is the B component used in the present invention has the general formula AJR
',,X5-(unit', R' is a hydrocarbon residue having 1 to 12 carbon atoms, X represents a halogen or alkoxy group, n
is preferably O<n≦3).

Such organoaluminum compounds are specifically, for example, triethylaluminum, tri-n-propylaluminum, tri-1-butylaluminum, triisobutylaluminum, tri-lowhexylaluminum, triisohexylaluminum, trioctylaluminum, diethylaluminum hydrite. , diisobutylaluminum hydride, diethylaluminum monochloride, ethylaluminum sesquichloride, diethylaluminium monoethoxide, and the like. Of course, two or more of these organoaluminum compounds can also be used in combination.

In general, a suitable method for polymerizing the propylene copolymer as component B is to first polymerize 3-methyl-1-butene in the presence of the above-mentioned catalyst, and then polymerize propylene. 2 other than the above catalysts, for example Ti1Js which is a conventional catalyst
The effects of the present invention cannot be obtained with a copolymer polymerized using aluminum chloride and diethylaluminum chloride.

Of the propylene copolymer thus obtained, 3%
-Methyl-1-butene content of o, oot-10% by weight and MFR of 0.1 to 200g710min are used in the present invention.

If the 3-methyl-1-butene content is too low, the effect of the present invention will not be achieved, and if it is too high, the dispersibility in component A will deteriorate, which is undesirable.In addition, if the VFR is too high, the catalyst activity will be reduced during polymerization. If it is too low, the dispersibility in component A will deteriorate, which is not preferable.

Incidentally, even if one tries to directly produce the composition of the present invention by polymerization when producing Nichishon, it is difficult to increase the degree of polymerization of 3-methyl-1-butene, and in the end, the significant nucleating agent, which is the effect of the present invention, is difficult to increase. There is a drawback that it is difficult to obtain an effective copolymer.

(3) Composition The composition of the present invention is obtained by blending the propylene copolymer of component B with the crystalline propylene polymer of component A.

The blending ratio of the above component B is such that the content of 3-methyl-1-butene is 0.00Ql-1% by weight, preferably Q, OO1-0.
3-methyl-1-, which can be determined to be 1% by weight.
If the butene content is below this range, the effects of improving transparency and synthesis, which are the objectives of the present invention, will be insufficient.

Even if it exceeds this range, not only is no further improvement effect expected, but it is also economically disadvantageous.

In the composition of the present invention, additional components may be added in addition to the above-mentioned essential components to the extent that the effects of the present invention are not significantly impaired. These additional components include 1. Antioxidants, neutralizing agents, ultraviolet absorbers, antifoam agents, 1. dispersants, antistatic agents, lubricants, molecular weight regulators (peroxides), etc. used for ordinary polyolefins. Various auxiliary agents such as a nucleating agent, a coloring agent for rubber component 1, etc. can be mentioned.

The composition of the present invention can be produced using a commonly used mixer such as a Henschel mixer, a Supermixer V blender, a tumbler mixer, a Ribonob 1 non-goo, a Banbury mixer 1 two-dar blender, or an extruder. It is preferable to mix the mixture for a predetermined time using a # machine and form it into a pellet shape using an ordinary extruder.

This composition is processed into various molded products through extrusion molding, blow molding, film molding, injection molding, compression molding, and the like. In particular, the effects of the present invention are greatly exerted on extruded bodies.

[Example] Next, the present invention will be specifically illustrated with examples. However, in the following examples, the degree of haze of the sheet was measured in accordance with ASTM-01003, and the tensile modulus of the sheet was measured in accordance with 15O-R1184. Example I MFR 1.0 g 710 min propylene homopolymer powder 1
00 parts by weight, tetrakis-[
methylene-(3,5-di-l-butyl-4-hydroxy-hydrocinnamate) 1 butane 0.1 part by weight, calcium stearate 0.05 part by weight as a neutralizing agent, and propylene produced by the method shown below. 3 parts by weight of 3-methyl-1-butene copolymer was added and mixed, and the mixture was melt-kneaded in an extruder with a screw diameter of 50 mm set at 260° C. to form granules.

Using an extruder with a screw diameter of 35 m and L/D of 28, this granular material is extruded through a coat hanger die with a width of 30Os at a tie temperature of 25°C, and hot water of 60°C is circulated inside. Sandwiched between two casting drums (hard chrome plated).

It was cooled and solidified to produce a sheet with a thickness of 0.6 mm.

This sheet contains 0.0044 3-methyl-1-butene.
It contained % by weight.

The degree of haze and tensile modulus of this sheet were measured. The results are shown in Table 1.

(Manufacture of propylene/3-methyl-1-butene copolymer) After purging a glass three-tube flask with an internal volume of SOOgwj equipped with a thermometer and a stirring bar with nitrogen, 751 purified hebutane and 75 ml of titanium were added. Tetrabutoxide and log
of anhydrous magnesium chloride. The flask was heated to 90°C and magnesium chloride was completely dissolved over 2 hours.The flask was then cooled to 40°C and 15ml of methylhydrodiene polysiloxane was added to dissolve the magnesium chloride/titanium tetrabutoxide complex. Let it precipitate.

After washing this with purified heptane, silicon tetrachloride 8.7
Add o+1 and 2.0 g of phthaloyl chloride and hold at 50°C for 2 hours. Thereafter, the purified product was washed with butane, and titanium tetrachloride 251 was further added thereto and maintained at 25°C for 2 hours. This was washed with purified butane to obtain a solid catalyst component.

The titanium content in the solid catalyst component was 2.7% by weight.

3-Methyl-1-butene A Contents: In a W111 stirring autoclave, 500 μl of purified hebutane, 0.8 g of the solid catalyst component prepared above,
32g of 3-methyl-1-butene and 2g of triisobutylaluminum were introduced and reacted at 50°C for 3 hours. The resulting polymer was washed with purified butane to remove residual triisobutylaluminum and 3-methyl-1-butene. The amount of polymerized 3-methyl-1-butene is 1g of solid catalyst.
It was 21g per serving.

11 Stop 21 After replacing the stirrer autoclave with internal volume 31 with propylene, 1.51 ml of sufficiently dehydrated n-hebutane was introduced and kept at 75°C, and further propylene was added at 7 kg/cm.
Pressurized to 0, then triethylaluminum 0. :1
8g, tert-butylmethyldimethoxysilane 0.16g
and 660m of the above 3-methyl-1-butene polymerization product
(containing 30 g of solid catalyst component) was introduced, and polymerization was carried out at 75° C. for 3 hours while adjusting the hydrogen concentration in the gas phase to 0.3% by volume. Thereafter, propylene was purged, and 10n+1 butanol was added to stop the polymerization, followed by filtration and drying to obtain 421 g of propylene copolymer powder. This propylene copolymer powder contained 0.15% by weight of 3-methyl-1-butene, and its MFR was 1.8 g/10 minutes.

Comparative Example 1 To 100 parts by weight of the same propylene homopolymer powder as in Example 1, tetrakis I methylene-
(3,5-di-1-butyl-4-hydroxy-hydrocinnamate) 0.1 part by weight of 1-butane and 0.05 part by weight of calcium stearate as a neutralizing agent were added and mixed in the same manner as in Example 1. A sheet with a thickness of 0.61 was produced.

The degree of haze and tensile modulus of this sheet were measured. The results are shown in Table 1.

Comparative Example 2 (Example using conventional catalyst) Tetrakis-1 methylene- as an antioxidant was added to 100 parts by weight of the same propylene homopolymer powder as in Example 1.
(0.1 part by weight of 3,5-di-l-butyl-4-hydroxy-hydrocinnamate 1-butane, 0.05 part by weight of calcium stearate as a neutralizing agent, and propylene/3-methyl produced by the method shown below) -3 parts by weight of a 1-butene copolymer were added and mixed to produce a sheet with a thickness of 0.6 mm in the same manner as in Example 1.This sheet contained 3-
It contained 0,0073% by weight of methyl-1-butene.

The degree of haze and tensile modulus of this sheet were measured. The results are shown in Table 1.

(Manufacture of propylene/3-methyl-1-butene copolymer) 3-Methyl-1-butene City A In a stirred autoclave with an internal volume of 1 j, 500 ml of purified hebutane, 0.8 g of trichloride manufactured by Marubeni Solvay Co., Ltd. Titanium, 4g diethylaluminum chloride, 32g 3
-Methyl-1-butene was introduced and reacted at 250°C for 3 hours. Thereafter, the purified product was washed with butane to remove residual q-diethylaluminum chloride and 3-methyl l-butene. 3~Methyl-1-butene polymerization amount is 1g of solid catalyst
It was 13g per serving.

1! After fully filling a stirred autoclave with 3 g of per serving with propylene, fully dehydrated n-hebutane 1,51 was introduced and maintained at 65°C, and further propylene was added at 7 kg/cs.
Furthermore, 1.0 g of diethylaluminum chloride and 0.1 g of the solid catalyst used above were introduced, and while the hydrogen concentration in the gas phase was adjusted to 2.5% by volume, the pressure was increased to 6.5 g.
Polymerization was carried out at ℃ for 3 hours.

Afterwards, purge the propylene and add 50 ml of butanol.
Polymerization was stopped by adding 1, followed by filtration and drying to obtain 515 g of propylene copolymer powder. This propylene copolymer powder contains poly3-methyl-1-
It contained 0.25 weight 1% of butene, and the MFR was 2.1 g and 710 minutes.

Comparative Examples 3 to 5 Tetrakis-[methylene-1 was added as an antioxidant to 10 parts by weight of the same propylene homopolymer powder as in Example 1.
3,5-di-l-butyl-4-hydroxy-hydrocinnamate)] 0.1 part by weight of butane, 0.05 part by weight of calcium stearate as a neutralizing agent, and 0.0 parts of dibenzylidene sorbitol manufactured by Easy Chemical ■ as a nucleating agent. .1 part by weight (Comparative Example 3), or pt-butyl manufactured by Shell Chemical ■
0.1 parts by weight of aluminum benzoate (Comparative Example 4) or 0.1 parts by weight of talc manufactured by Matsuzai Sangyo ■ (Comparative Example 5) were added and mixed, and the thickness was adjusted in the same manner as in Example 1. 0.
A 6 m sheet was produced.

The demand level and tensile modulus of these sheets were measured. The results are shown in Table 1.

(Left below) Example 2 Propylene/ethylene random copolymer powder ioo with a VFR of 2.5g 710 minutes and an ethylene content of 3.5% by weight
Tetrakis as an antioxidant for the i-position part]]
Methylene-3,5-di-1-butyl-4-hydroxy-
0.11 parts by weight of 1-butane (hydrocinnamate), 0.05 parts by weight of calcium stearate as a neutralizing agent, and 1 part by weight of the same propylene/3-methyl-1-butene copolymer as in Example 1 were added and mixed. , and made into granules in the same manner as in Example 1.

This granular material was processed in the same manner as in Experimental Example 1 to a thickness of 0.6 mm.
It was formed into a sheet. This sheet contains 3-methyl-1-
Butene was contained in an amount of 0.0014% by weight.

The degree of haze and tensile modulus of this sheet were measured. The results are shown in Table 2.

Example 3 Tetrakis-I methylene-(3,5-di-l-butyl-4-hydroxy-hydrocinnamate) was added as an antioxidant to 100 parts by weight of the same propylene/ethylene random copolymer powder as in Example 2. ) 1 butane 0.1 part by weight,
As a neutralizing agent, 10 parts by weight of the same propylene/3-methyl-1-butene copolymer as in Example 1 were added and mixed, and 1 part by weight of calcium stearate, 0. I made it into a thing.

The obtained granules were processed in the same manner as in Example 1 to a thickness of 0.6 m.
It was molded into a sheet of m. This sheet contains 3-methyl-
The 1-butene content was 1% O,0135Ni.

The degree of haze and tensile modulus of this sheet were measured. The results are shown in Table 2.

Comparative Example 6 To 100 parts by weight of the same propylene/ethylene random copolymer powder as in Example 2, tetrakis-1 methylene-(3°5-geniebutyl4-hydroxy-hydrosinname-1) was added as an antioxidant. ) 1 butane 0.1 part by weight,
0.05 parts by weight of calcium stearate was added as a neutralizing agent and mixed, and granules were prepared in the same manner as in Example 1.

The granules were formed into a sheet with a thickness of 0.5 mm in the same manner as in Example 1. Table 2 shows the results of measuring the demand level and tensile modulus of this sheet.

Comparative Example 7.8 Tetrakis-[methylene-(3,5-di-l-butyl-4-hydroxy-hydro) was added as an antioxidant to 100 parts by weight of the same propylene/ethylene random copolymer powder as in Example 2. cinnamate) 1 butane 0.1 part by weight,
0.05 parts by weight of calcium stearate as a neutralizing agent and 0.1 part of dibenzylidene sorbitol manufactured by Easy Chemical ■ as a nucleating agent! il 1 part (comparative example 7), or pine wood industry ■
0.1 part by weight of talc (Comparative Example 8) was added and mixed, and granules were prepared in the same manner as in Example 1.

These granules were formed into a sheet with a thickness of 0.6 mm in the same manner as in Example 1. Table 2 shows the results of measuring the degree of haze and tensile modulus of these sheets.

(The following is a blank space) [Effects of the Invention] The propylene polymer composition of the present invention is obtained by polymerizing a propylene 1 polymer in the presence of a specific catalyst and has a 3-methyl-1-butene content of 0.001-io. By the simple method of blending a small amount of propylene copolymer with a melt flow rate of 0.1 to 200 g/10 min by weight%, transparency and rigidity were surprisingly improved. There is no problem of bleeding or lumps occurring during extrusion molding, unlike when blended.

The propylene polymer composition of the present invention is particularly useful as a material for sheets, films, etc., as well as extrusion molded products such as transparent bottles by blow molding.

Claims (1)

[Claims] (1) A propylene polymer with excellent transparency and rigidity, which is a composition comprising the following A and B and has a 3-methyl-1-butene content of 0.0001 to 1% by weight. Composition. A, a crystalline propylene polymer with a melt flow rate of 0.1 to 200 g/10 minutes B, a solid titanium catalyst component containing halogen-containing magnesium, halogen-containing titanium, and an electron-donating compound as essential components, and an organoaluminum compound. The melt flow rate is 0 when the content of 3-methyl-1-butene is 0.001 to 10% by weight and is obtained by polymerization in the presence of a catalyst to be formed.
．． 1-200g/10min propylene copolymer