JPH02247202A - Method for producing 3-methylbutene-1 polymer film or sheet - 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 Field of Application] The present invention relates to an improvement in a method for producing 3-methylbutene-1 polymer films or sheets. More specifically, the present invention provides a material having excellent mechanical strength such as tear strength and impact strength, and heat resistance, and having a uniform thickness.
-Methylbutene-1 The present invention relates to a method for producing a polymer extruded film or sheet with good productivity.

[Prior Art] In recent years, in the field of industrial films for mold release, electrical insulation, and various heat-resistant food packaging materials, as applications have expanded, heat resistance, mechanical strength, electrical properties, and durability have increased. There is an increasing demand for films and sheets with excellent chemical resistance and non-hygroscopic properties.

On the other hand, 3-methylbutene-1 polymer has been known as a crystalline polyolefin with a high melting point. 3-Methylbutene-1 polymer (Japanese Unexamined Patent Application Publication No. 184510/1983), a polymer with a content of 3-methylbutene-1 of 90% by weight or more and a polymer with a content of 40 to 90% by weight of 3-methylbutene-1 Proposed a composition consisting of a polymer and a method for producing the same (Japanese Unexamined Patent Publication No. 61-7349), a 3-methylbutene-1 polymer composition containing a rubbery component and a method for producing the same (Japanese Patent Application No. 63-060697), etc. Let's do it.

These 3-methylbutene-1 polymers and polymer compositions are useful in themselves, and the films and sheets obtained from them can be used as industrial films as described above or as packaging materials for various foods. It is considered that a considerable part of the required performance can be met.

However, this 3-methylbutene-1 polymer film or sheet can be manufactured with high productivity by extrusion molding, that is, by extruding the 3-methylbutene-1 polymer melt into a sheet from a die and then casting it onto a cooling drum. If the 3-methylbutene-1
Due to the high crystallization temperature and fast crystallization rate of the polymer, adhesion to the cooling drum is poor, and the resulting film or sheet is inhomogeneous with partially different degrees of crystallinity, resulting in a thick and thin film or sheet. Problems arise, such as uneven tear strength and insufficient tear strength.

[Problems to be Solved by the Invention] Under these circumstances, the present invention provides a 3-methylbutene-1 polymer which has excellent mechanical strength such as tear strength and impact strength, and heat resistance, and has a uniform thickness. The purpose of this invention is to provide a method for manufacturing a composite film or sheet with high productivity.

[Means for Solving the Problem] As a result of intensive research to achieve the above object, the present inventors have found that, in an extrusion molding method, the temperature of the air gap and the cooling drum are kept within a specific range, and It was discovered that the objective could be achieved by casting on a cooling drum using an electrostatic application contact method, and based on this knowledge, the present invention was completed.

That is, in the present invention, a melt of 3-methylbutene-1 polymer is extruded into a sheet form from a die, and then cast onto a cooling drum maintained at a temperature of 40 to 150°C with an air gap of 10 cm or less, and electrostatic 3-Methylbutene-1, which is characterized by being brought into close contact with an applied voltage.
A method of making a polymeric film or sheet is provided.

The present invention will be explained in detail below.

The 3-methylbutene-1 polymer used in the method of the present invention includes 3-methylbutene-1 homopolymer and 3-methylbutene-1 polymer.
- Consists of at least one copolymer of methylbutene-1 and other σ-olefins having 2 to 20 carbon atoms, and has a melt index of 0, 59/10 minutes or more at a temperature of 320°C. Preferably.

Next, to explain these preferable materials by giving specific examples, firstly, (A) 3-methylbutene-1 alone having a heat of fusion measured by a differential scanning calorimeter (DSC) of 7 c*l/9 or more; Polymer or 3-methylbutene-1 and carbon number 2~
10 to 85% by weight of copolymer with other α-olefins of 20, (B) heat of fusion measured by DSC is 1caffi/9
10 to 85% by weight of a copolymer of 3-methylbutene-1 which is larger and less than 7 csa/g and another a-olefin having 2 to 20 carbon atoms, and (C) a rubber in which no melting peak is observed in DSC. Copolymer of 3-methylbutene-1 and other σ-olefin having 2 to 20 carbon atoms or 2
A ternary 3-methylbutene-1 polymer composition containing a rubbery component containing 3 to 40% by weight of a copolymer of at least 2 to 20 carbon atoms other than 3-methylbutene-1. (Described in Japanese Patent Application No. 63-060697)
Among them, those having a melt index of 0.5 g/10 minutes or more at a temperature of 320°C can be mentioned.

Examples of other a-olefins having 2 to 20 carbon atoms in the copolymer of component (A) include ethylene, propylene, butene-11hexene-114-methylpentene-
1, octene-11decene-1, dodecene-1, tetradecene-1, styrene, vinylcyclohexane, and the like.

These a-olefins may be used alone or in combination of two or more, and may also contain a small amount of polyene such as butadiene or isoprene.

Further, the copolymer is preferably a random copolymer, and the content of 3-methylbutene-1 unit therein is as follows:
Although it varies depending on the type of other olefins to be copolymerized,
Usually it exceeds 90% by weight, and when particularly high heat resistance is required, it is preferably 95% by weight or more. in this case,
The heat of fusion is 9clffi/g or more. If the heat of fusion of component (A) is less than 7 calls/y, the crystallinity of the entire composition may be insufficient or the melting point may be lowered. This is not preferable since there is a risk that the heat resistance and solvent resistance properties will be impaired.

The content of the component (A) in the composition is 10 to 85% by weight, preferably 30 to 80% by weight, more preferably 40% by weight.
-70% by weight.

As the other α-olefin having 2 to 20 carbon atoms in the copolymer of component (B), one or more types can be selected and used from among those exemplified in the explanation of component (A). Further, these α-olefins may contain a small amount of polyenes such as butadiene and isoprene. The copolymer is preferably a random copolymer, and the content of 1 unit of 3-methylbutylene therein varies depending on the type of other α-olefin to be copolymerized, but is usually more than 60% by weight, and less than 95% by weight.

Furthermore, the heat of fusion of this component (B) is greater than tcal/g and less than 7c*179, and the content of component (B) in the composition is 10 to 85% by weight,
Preferably 15-50% by weight, more preferably 20-4%
It is selected within the range of 5% by weight.

On the other hand, the number of carbon atoms in the copolymer of component (C) is 2 to 2.
As the a-olefin other than 0, one or more types can be appropriately selected and used from among those exemplified in the explanation of the component (A).

Further, the α-olefin may contain a small amount of polyene such as butadiene or isoprene.

This component (C) is a copolymer of two or more a-olefins other than 3-methylbutene-1, such as ethylene-propylene, ethylene-4-methylpentene-1, propylene-4-methylpentene-1,4 -Methylpentene-1
-octene-1,4-methylpentene-1-decene-°
A copolymer such as 1,4-methylpentene-1-dodecene-1,4-methylpentene-1-decene-1-tetradecene-1, and the content of each comonomer unit is about 30 to 70% by weight. However, preferably it is a copolymer of 3-methylbutene-1 and another α-olefin.

This copolymer is preferably a random copolymer, and the content of 3-methylbutene-1 unit therein is:
The content is usually less than 60% by weight, preferably 50% by weight or less, and more preferably 3 to 50% by weight. If this amount deviates from the above range, improvements in stretchability, tear strength, impact strength, etc. of the film or sheet will be insufficient.

The content of component (C) in the composition is selected within the range of 3 to 40% by weight, preferably 3 to 30% by weight, and more preferably 5 to 25% by weight. If this amount is less than 3% by weight, the effect of improving stretchability, elongation, and tear strength will not be sufficiently exhibited, and if it exceeds 40% by weight, heat resistance, solvent resistance, etc. will decrease.

The degree of crystallinity of a polymer, or the amount of crystalline components, is reflected in the heat of fusion of the polymer as measured by a differential scanning calorimeter. The heat of fusion of 3-methylbutene-1 homopolymer is also influenced by stereoregularity and molecular weight, but is usually 16 c
The value is about al/g, and virtually no heat of fusion is observed in the rubbery copolymer.

There are no particular limitations on the method for preparing the polymer composition containing the component (A), component CB), and component (C). For example, a method of simply mixing powders or pellets of each component, a method of mixing as a suitable solution, a method of kneading with a single screw or twin screw extruder, a Banbury mixer, etc. may be used, but a three-stage polymerization method may be used. It is advantageous to adopt

Next, to explain this three-stage polymerization method, for example, first, the polymerization process is carried out in an aliphatic, alicyclic, or aromatic hydrocarbon such as butane, hexane, heptane, cyclohexane, benzene, in a liquid olefin, or in the absence of a solvent. Component (A) and ( By producing component B) and then producing component (C), the desired polymer composition can be obtained; however, the elution of component (C) into the solvent in the catalyst removal step can be prevented. , first component (A), then component (B
) and finally component (C) is preferred.

Next, as a second preferred example, (a) 3-methylbutene-1 homopolymer or 3-methylbutene-1 having a content of more than 90% by weight of 3-methylbutene-1 units and other polymers having 2 to 2 carbon atoms; Copolymers 10 to 9 with a-olefins of
5% by weight, and (b) a copolymer of 3-methylbutene-1 and another σ-olefin having 2 to 20 carbon atoms with a content of 40 to 90% by weight of 3-methylbutene-1 units (90 to 5% by weight) % of a two-component 3-methylbutene-1 polymer composition (described in JP-A-61-7349)
Among these, those having a melt index of 0.59/10 minutes or more at a temperature of 320°C can be mentioned.

Other a-olefins having 2 to 20 carbon atoms in the copolymer of component (a) include those exemplified in the description of the first three-component polymer composition. This copolymer is preferably a random copolymer, and the content of 3-methylbutene-1 units therein is more than 90% by weight, preferably 95% by weight or more.

The content of component (a) in the composition is 10 to 95% by weight,
It is preferably selected within the range of 20 to 90% by weight.

On the other hand, other a-olefins having 2 to 20 carbon atoms in the copolymer of component (b) include those exemplified in the description of the first three-component polymer composition. This copolymer is preferably a random copolymer, and the content of 3-methylbutene-1 unit therein is selected within the range of 40 to 90% by weight.

The content of component (b) in the composition is selected from 5 to 90% by weight, preferably from 10 to 80% by weight.

There are no particular limitations on the method for preparing the polymer composition containing component (a) and component (b). For example, a method of simply mixing powders or pellets of each component, a method of mixing as a suitable solution, a method of kneading with a single-screw or twin-screw extruder, a Banbury mixer, etc. may be used, but a two-stage polymerization method may be used. It is advantageous to adopt

Next, to explain this two-stage polymerization method, for example, first, the polymerization is carried out in an aliphatic, alicyclic, or aromatic hydrocarbon such as butane, hexane, heptane, cyclohexane, benzene, or in a liquid olefin, or in the absence of a solvent. First, 3-methylbutene-1 or 3-methylbutene-1 and other a-olefins are polymerized in the presence of a metal compound and an organometallic compound of a metal from Group 1 to Group 3 of the turbid period table.
By producing component () and then producing component (b), the desired polymer composition can be obtained.

If we reverse this order and generate component (b) first, we get
The slurry properties of the final polymer may deteriorate.
Undesirable.

Finally, as a third preferred one, a random copolymer of 3-methylbutene-1 and another α-olefin having 2 to 2 carbon atoms, in which the content of other α-olefin units is 10 to 30% by weight. % and has a melt index of 0.5 g/10 minutes or more at a temperature of 320°C.

This copolymer can be used, for example, butane, hexane, heptane,
In an aliphatic, alicyclic or aromatic hydrocarbon such as cyclohexane or benzene, in a liquid olefin, or in the presence of a transition metal compound and an organometallic compound of a group 1 to 3 metal of the periodic table in the absence of a solvent. , 3-methylbutene-1 and another α-olefin having 2 to 20 carbon atoms can be produced by random copolymerization. At this time, one type of other α-olefin may be used, or two types of α-olefins may be used.
You may use combinations of more than one species.

The transition metal compounds used in the polymerization of each of the polymer compositions and copolymers described above and those belonging to groups 1 to 3 of the periodic table.
There are no particular restrictions on the group metal organometallic compound, and those commonly used in olefin polymerization can be used, but preferred ones include, for example, Mg, T.
I. Combinations of solid catalyst components containing rogens and electron-donating compounds such as ethers and esters, organoaluminium compounds, and electron-donating compounds such as ethers and esters used as necessary can be mentioned. . Such a solid catalyst component is disclosed in, for example, JP-A-52
-98076 publication, 53-24378 publication, 53-24378 publication
Publication No. 3-85877, Publication No. 53-117083,
It is described in JP 59-6204, JP 59-11306, etc. In addition, a solid titanium trichloride catalyst component having an aluminum content in an atomic ratio of aluminum to titanium of 0.15 or less and containing a rusting agent, an organoaluminum compound, especially aluminum dialkyl monohalide, and optionally Combinations with electron-donating compounds such as ethers and esters are also preferably used. Such a solid titanium trichloride catalyst component is
For example, Japanese Patent Publication No. 55-8451, No. 55-8452
Publication No. 55-8003, Publication No. 54-27871
No. 55-39165, No. 55-1405
It is described in Publication No. 4, Publication No. 53-44958, etc.

The polymerization temperature is usually selected in the range of 0 to 150°C, and
If necessary, a molecular weight modifier such as hydrogen can be used.

In the present invention, the three types of 3-methylbutene-1
Among the polymer compositions and copolymers, a terpolymer composition containing the first rubbery component is most suitable in view of the balance between heat resistance and film strength.

Further, in the present invention, the 3-methylbutene-1 polymer composition or copolymer used as the base resin of the film or sheet preferably has a melt index of 0.59/10 minutes or more at a temperature of 320°C. 1-30y
/lo minutes, more preferably in the range of 5 to 24 M/10 minutes.

Furthermore, the base resin of the film or sheet used in the present invention may optionally include the above-mentioned 3-methylbutene-
In addition to the 1 polymer, about 5% by weight or less of other polymers, such as polyethylene, polypropylene, poly4-methylpentene-1, ethylene-propylene rubber, etc., and about 5% by weight or less of organic or inorganic fillers, such as talc,
Titanium oxide, silicon oxide, carbon black, glass fiber, carbon fiber, etc. can be blended, and additives such as antioxidants, heat stabilizers, and ultraviolet absorbers can also be added.

In the present invention, as a method for blending each additive component into the 3-methylbutene-1 polymer composition or copolymer, for example, using a mixing device such as a V-type blender or a super mixer, 3-methylbutene-1 polymer The composition or copolymer and each additive component may be mixed and then directly supplied to the melt molding process, or the mixture may be melt kneaded using an extruder, coney goo, etc., formed into a pellet, and then supplied to the melt molding process. It's okay.

The resin composition thus obtained is fed to a known extrusion device such as an extrusion device, and heated to a temperature equal to or higher than the melting point of the composition to melt it. At this time, the 3-
In the presence of oxygen in the molten state, the methylbutene-1 polymer may reduce its molecular weight due to molecular chain scission, so it is desirable to purge the inside of a hopper such as an extruder with an inert gas such as nitrogen or carbon dioxide.

The resin composition melted in this way is continuously extruded through a slit-shaped gui (mainly a T-die) and is unified.
The air gap is maintained at 10 cm or less, preferably 5 cIl or less, and the mixture is cooled and solidified on a cooling drum (cast drum). The 3-methylbutene-1 polymer has a fast crystallization rate and a high crystallization temperature, so the air gap is 1.
When it is larger than 0 cm, the temperature of the molten resin composition decreases and crystallization begins before the film or sheet comes into contact with the cooling drum. As a result, the film or sheet becomes wavy or uneven in thickness, and as a result, the adhesion of the cooling drum becomes insufficient, crystallization becomes uneven in various parts, and the strength decreases.

In the present invention, the cooling drum and 3-methylbutene-1
In order to improve the adhesion with the polymer film or sheet, an electrostatic charge is applied to the polymer near the contact point between the molten polymer and the drum, and this electrostatic charge is combined with the induced charge induced on the drum surface. A so-called electrostatic application adhesion method is used to bring the molten polymer into close contact with the drum surface by the Coulomb attraction between the drums and promote cooling of the polymer.

The temperature of the cooling drum is 40 to 150°C, preferably 60°C.
It is necessary that the temperature is in the range of ~120°C. If this temperature is less than 40°C, the film or sheet may slip on the cooling drum, resulting in insufficient electrostatic adhesion, resulting in an inhomogeneous film; if it exceeds 150°C, the rigidity of the polymer may decrease. However, as crystallization progresses and the spherulite size becomes too large, the strength of the film decreases, and in some cases, the low molecular weight components and additives in the polymer may deteriorate. bleed and contaminate the surface of the cooling drum.

In the electrostatic application contact method, it is necessary to make the electrode narrower than the film width in order to prevent discharge with the drum. Yes
As mentioned above, the 3-methylbutene-1 polymer has a high crystallization temperature and a fast crystallization speed, so in some cases, even if the center of the film is in close contact with the cooling drum, the ends of the film may Adhesion may be insufficient, and in such cases, it is preferable to use a liquid application method of applying an adhesion liquid onto the drum at the same time as the electrostatic application adhesion method during casting. This liquid may be applied uniformly to the entire drum, or in the electrostatic application contact method,
It may be applied only to both ends of the film that cannot be completely covered by the electrodes.

There are no particular restrictions on the adhesion liquid, and any one can be selected from those commonly used in conventional liquid coating methods. Specifically, liquids with boiling points of 150 to
It is in the range of 220℃, and the surface tension at room temperature is 5.
Alcohols of 0 dyn/cm or less, such as n-hexanol, n-octanol, ethylene glycol, trimethylene glycol, etc., and nonionic, anionic, cationic, amphoteric surfactants, etc. added to these alcohols as appropriate. , oily substances such as vegetable oil, mineral oil, silicone oil, or with a boiling point of 150 to 220°C,
Organic liquids other than alcohols with a surface tension of 50 dyn/Cm or less at room temperature, such as carboxylic acids such as acetic acid and valeric acid, carboxylic acid esters such as methyl benzoate, ethyl benzoate, and diethyl malonate, acyl ethers, anisole, etc. ethers, ketones such as cyclohexanone, nitrile compounds such as capronitrile and benzonitrile, amines such as aniline and 0-toluidine, water alone, or water and methyl cellosolve,
Examples include mixtures with ethyl cellosolve, isopropyl cellosolve, n-propyl cellosolve, inamyl cellosolve, n-butyl cellosolve, inamyl cellosolve, diethylene glycol ethyl ether, and the like.

Application of these sealing liquids can be performed by a conventionally known method, for example, a method using a spray nozzle or the like.

In the present invention, the ratio between the extrusion speed of the molten resin and the take-up speed of the film or sheet when molding the film or sheet, that is, the draft ratio, is desirably 20 or less, preferably 15 or less. This draft ratio is 20
If it exceeds this amount, orientation will be excessively applied, and the mechanical strength of the obtained film or sheet will tend to decrease.

The film or sheet thus obtained is subjected to heat-setting treatment, if necessary. This heat-setting treatment is usually carried out for 1
1 to 150 at a temperature in the range of 50°C or higher and lower than the melting point.
This is done by holding it for a second.

The 3-methylbutene-1 polymer film or sheet produced in this way can be used, for example, as a release film, an industrial film such as an electrical insulation film, or a heat-resistant food packaging material or a thermoforming sheet. It is useful as

[Examples] Next, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these Examples in any way.

In addition, each physical property value was calculated|required according to the method shown below.

(1) Melt index (Ml) Based on ASTM D1238, 320°C, 2.16 to 9
Measured under the following conditions.

(2) Tear strength Measured by conducting an Elmendorf tear test in accordance with JISP-8116.

(3) Melting point and heat of fusion of copolymer Measured using a DuPont Model 9900 differential scanning calorimeter. −
The heat of fusion of the polymer in the second stage is an actual value, but the heat of fusion of the second stage polymer is an estimated value based on the actual value of the copolymer component.

(4) Content of each unit in the copolymer It was determined by measuring a 100-degree high-resolution NMR spectrum at 310° C. using a JEOL FX200 NMR device (equipped with a high-temperature variable device).

(5) As a falling weight impact strength measurement device, a drop tester manufactured by Rheometrics was used, and the falling weight height was 50.292c.
m, falling weight weight 3.6L97, falling weight speed 3.3337
Measured under M/S conditions.

The measurement temperature is room temperature.

The measured value was expressed by dividing the amount of energy required for fracture by the sample thickness.

The sample piece was fixed to a clamp with an inner diameter of 1.5 inches and used for measurement.

Preparation Example 1 Preparation of Solid Titanium Dioxide Catalyst Component At room temperature, purified toluene 515 Sui Q was placed in an 11 capacity autoclave which was sufficiently purged with nitrogen, and under stirring, n-butyl ether 65.19 (0.5 moa) and tetrachloride were added. 94.9 g of titanium (0,5+eoD) and 28.69 g (0,24 mo) of diethylaluminium chloride were added to obtain a brown homogeneous solution.

Next, the temperature was raised to 30°C, held at that temperature for 30 minutes, then raised to 40°C, and held at that temperature for 2 hours. Then titanium tetrachloride 329 (0,171011) and tridecyl methacrylate 15.59 (0,058 mall)
was added and the temperature was raised to 98°C.

After being maintained at 98°C for 2 hours, a granular purple solid was separated and washed with toluene to obtain solid titanium trioxide.

Production Example 1 Production of 3-methylbutene-1 polymer composition 372 mm of diethylaluminum monochloride was placed in a 3001 reactor whose interior was replaced with nitrogen. and 3-methylbutene-11441, and after raising the internal temperature to 80°C, the solid titanium dioxide catalyst component 11 obtained in Preparation Example 1 was added.
59 was charged, and the first stage polymerization was started. At the same time, copolymerization of 3-methylbutene-1 and butene-1 was carried out at 80° C. for 90 minutes while continuously supplying butene-1 and hydrogen. The total amount of butene-1 supplied to the first stage is 2.3509
, the total amount of hydrogen was 0.37 aoa.

Next, the amount of hydrogen supplied was changed, the supply of butene-1 was stopped, the supply was switched to octene-1, and the second copolymerization of 3-methylbutene-1 was carried out at 80° C. for 42 minutes. The amount of hydrogen supplied in this second stage is 0.39 mail, and the amount of octene-1 supplied is 2.5509 mail.

Next, the temperature was lowered to 40°C, and octene-17,9
After that, while supplying octene-1, 3
The stage polymerization was carried out at 4060 for 80 minutes. No hydrogen was supplied to this third stage.

Further, the total amount of octene-1 supplied in the third stage was 12.1 to 9.

Next, isobutanol 141! was charged, the polymerization was stopped, unreacted monomers were expelled, 86 g of n-hexane was charged, and the mixture was stirred at 40°C for 60 minutes.
The temperature was lowered to room temperature, and the supernatant liquid was extracted. This operation was repeated six times to wash and remove the catalyst component in the polymer, and then dried to obtain 42.0 kg of a white powdery 3-methylbutene-1 polymer composition.

The proportions of each component determined by catalyst analysis of a small amount of the polymer sampled at the end of the first, second and third stages are as follows: 55% by weight for the first stage polymer [component (A)]; A
) The content of butene-1 unit in the component is 7.1% by weight, 2
The stage polymer [component (B)] is 27% by weight, the content of octene-1 in the component (B) is 17% by weight, the third stage polymer [component (C)] is 18% by weight, The content of octene-1 heavy position in component (C) was 84% by weight.

Also, the heat of fusion of the first stage polymer is 11 cs! / 9.2
The heat of fusion of the step polymer was 2eaA/g.

Next, 0.21 L of each of Irganox 1 O1 O and Irgafuos P-EPQ (both manufactured by Nippon Ciba Geigy) were added to the polymer composition thus obtained.
After adding 30 parts (per 100 parts by weight of the composition)
The pelletization was carried out using an extruder at 0°C. This product had a melting point of 284°C and a melt index of 6.59/10 minutes.

Production Example 2 Production of 3-methylbutene-1 copolymer Production Example 1
, only the first stage polymerization was carried out for 3 hours, the amount of 3-methylbutene-1 charged was 160fi, the amount of diisobutylaluminum monochloride as organoaluminum was 488 mmoQ, and the solid titanium trichloride catalyst component of Preparation Example 1 was used. Polymerization was carried out in the same manner as in Production Example 1, except that the amount of 3-methylbutene-1/butene-1 random copolymer powder was 151 g and the total amount of butene-1 was 6.5309. I got a 9. The content of butene-1 position in this copolymer was 10.5% by weight.

Irganox 1 was added to the copolymer thus obtained.
010. 0.2 parts by weight of Irgafuos P-EPQ C (all manufactured by Ciba Geigy, Japan) (copolymer 10
0 parts by weight) and 0.2 parts by weight of dihydroanthracene (per 100 parts by weight of the copolymer) were added, and pelletization was performed using an extruder at 320°C. The melting point of this product was 271° C.1 melt index was 1.7 g/10 minutes.

Examples 1 to 4.6, Comparative Example 1 The 3-methylbutene-1 polymer composition obtained in Production Example 1 was cast onto a cooling drum under various conditions shown in Table 1. At this time, 30IllI+b was used, the resin temperature was 290°C, and in the electrostatic application contact method, 8 kV was applied using a 0.2 mrn electrode. The results are shown in Table 1.

Example 5 Using the 3-methylbutene-1 copolymer obtained in Production Example 2, a sheet was formed by an electrostatic application contact method under the conditions shown in Table 1. The results are shown in Table 1.

Comparative Example 2 The 3-methylbutene-1 copolymer obtained in Production Example 2 was cast on a pinch roll in water under the conditions shown in Table 1, but the resulting film had some wrinkles and The intensity was also low. The results are shown in Table 1.

(The following is a blank space) [Effects of the Invention] According to the present invention, a 3-methylbutene-1 polymer film or sheet having excellent mechanical strength such as tear strength and impact strength and heat resistance and having a uniform thickness can be produced by extrusion molding. It can be manufactured with high productivity.

The 3-methylbutene-1 polymer film or sheet obtained by the method of the present invention is suitably used as industrial films such as release films and electrical insulation films, or as packaging materials for various heat-resistant foods.

Claims (1)

[Claims] 1 After extruding the melt of 3-methylbutene-1 polymer into a sheet from a die, an air gap of 10 cm was created.
A method for producing a 3-methylbutene-1 polymer film or sheet, which is characterized by casting on a cooling drum maintained at a temperature of 40 to 150° C. and applying an electrostatic charge to bring the film or sheet into close contact with each other.