WO2013128964A1

WO2013128964A1 - Method for producing resin molded body

Info

Publication number: WO2013128964A1
Application number: PCT/JP2013/050698
Authority: WO
Inventors: 敏雄中根; 克裕西村
Original assignee: ポリプラスチックス株式会社
Priority date: 2012-02-27
Filing date: 2013-01-16
Publication date: 2013-09-06

Abstract

In order to prevent the problem of die build-up adhering to the lip of a die during molding even when a cyclic olefin resin composition, which contains a cyclic olefin resin and a linear low-density polyethylene, is used as a raw material, the cyclic olefin resin composition is formed into a resin molded body after adjusting the resin heat to a range of 100°C to 160°C above the glass transition point (Tg) of the cyclic olefin resin when the cyclic olefin resin composition is ejected from lip of the die by using an extruder provided with a die. Said cyclic olefin resin composition contains a cyclic olefin resin (A) containing an α-olefin, a linear low-density polyethylene (B) and a fatty acid metal salt (C), as copolymer components. The content of the cyclic olefin resin (A) is 40 mass% to 95 mass%; the content of the linear low-density polyethylene (B) is 5 mass% to 60 mass%; and the content of the fatty acid metal salt (C) is 5 ppm to 2000 ppm.

Description

Manufacturing method of resin molding

This invention relates to the manufacturing method of the resin molding which uses a cyclic olefin resin composition as a raw material.

The cyclic olefin resin is a resin having a cyclic olefin skeleton in the main chain, and has high transparency, low birefringence, high heat distortion temperature, light weight, dimensional stability, low water absorption, hydrolysis resistance, and chemical resistance. It is a resin with many features such as low dielectric constant, low dielectric loss, and no environmental load substances. For this reason, cyclic olefin resins are used in a wide variety of fields where these characteristics are required.

As described above, since the cyclic olefin resin is used in various fields, an extruder is often used for molding the cyclic olefin resin. However, when a cyclic olefin resin is introduced into a molding machine to produce a resin molded body, a sag (a material in which the raw material resin adheres to the lip part) is generated at the lip part of the die at the tip of the extruder. In order to cause such a problem that the main body falls off during molding and is mixed into the molded body, a method for preventing the main body from being generated during molding is required.

For example, Patent Document 1 discloses that adjusting the temperature of the discharge port of the die to 200 ° C. or more and 255 ° C. or less makes it difficult to generate a sag. Patent Document 2 discloses a technique that uses a fatty acid metal salt in order to suppress the occurrence of scouring.

JP 2010-12696 A JP 09-255824 A

By the way, when molding a cyclic olefin resin composition containing a cyclic olefin resin and another thermoplastic resin, the above-mentioned problem of the main chain is particularly likely to occur. For example, a cyclic olefin resin composition containing a cyclic olefin resin and a linear low density polyethylene is used in various applications such as a heat-shrinkable film. Occurrence problems occur.

In the case where the above cyclic olefin resin composition is used as a raw material, the generation of the mains cannot be sufficiently suppressed by a conventionally known solution.

The present invention has been made in order to solve the above problems, and the purpose thereof is a case where a cyclic olefin resin composition containing a cyclic olefin resin and a linear low density polyethylene is used as a raw material. An object of the present invention is to provide a technique capable of suppressing the problem that the sticking of the lip portion of the die during molding is prevented.

The inventors of the present invention have made extensive studies to solve the above problems. As a result, the present inventors have found that the resin temperature at the time when the cyclic olefin resin composition is discharged from the lip portion of the die has an influence on the generation of the scouring and has completed the present invention. More specifically, the present invention provides the following.

(1) A method for producing a resin molded product that suppresses adhesion of deposits to the lip portion of the die during the production of the resin molded product, and a cyclic olefin resin (A) containing α-olefin as a copolymerization component and a linear chain A low-density polyethylene (B) and a fatty acid metal salt (C), wherein the content of the cyclic olefin resin (A) is 40% by mass to 95% by mass, and the linear low-density polyethylene ( A cyclic olefin resin composition having a content of B) of 5% by mass to 60% by mass and a content of the fatty acid metal salt (C) of 5 ppm to 2000 ppm by using an extruder equipped with a die. The resin temperature when the cyclic olefin resin composition is discharged from the lip portion of the die is adjusted to the glass transition point (Tg) of the cyclic olefin resin + 100 ° C. to Tg + 160 ° C. Method for producing a resin molded article for molding into lipid moldings.

(2) The melt tension of the cyclic olefin resin composition measured at 190 ° C. with a winding speed of 15 m / min is 10 mN or more, and the melt of the cyclic olefin resin composition at 190 ° C. and a load of 2.16 kg. The method for producing a resin molded article according to (1), wherein the flow rate is 0.1 g / 10 min or more and 15 g / 10 min or less.

(3) The method for producing a resin molded body according to (1) or (2), wherein the take-up speed of the resin molded body is 5 m / min or more and 50 m / min or less.

(4) Production of the resin molded product according to any one of (1) to (3), wherein the linear low-density polyethylene (B) is a linear low-density polyethylene obtained by polymerization using a metallocene catalyst. Method.

(5) The method for producing a resin molded body according to any one of (1) to (4), wherein the fatty acid metal salt (C) is calcium stearate.

According to the present invention, even when a cyclic olefin resin composition containing a cyclic olefin resin and a linear low-density polyethylene is used as a raw material, the occurrence of scum adhering to the lip portion of the die can be suppressed.

It is a figure which shows typically the evaluation method of die adhesion amount. It is a figure which shows the adhesion amount of the scent in an Example and a comparative example.

Hereinafter, embodiments of the present invention will be described. In addition, this invention is not limited to the following embodiment.

<Production method of resin molding>
In the method for producing a resin molded body of the present invention, as a raw material, 40% by mass to 95% by mass of a cyclic olefin resin (A) containing an α-olefin as a copolymerization component and a linear low density polyethylene (B) are used. A cyclic olefin resin composition containing 5 ppm to 60 mass% and 5 ppm to 2000 ppm of the fatty acid metal salt (C) is used.

Moreover, in the manufacturing method of the resin molding of this invention, as manufacturing conditions, the resin temperature when a cyclic olefin resin composition discharges from the lip | rip part of die | dye is glass transition point (Tg) +100 degreeC or more of cyclic olefin resin. It adjusts in the range below Tg + 160 degreeC.

Hereinafter, the method for producing the resin molded body of the present invention will be described in the order of raw materials and production conditions.

[Cyclic olefin resin composition]
The cyclic olefin resin composition used as a raw material in the method for producing a resin molded body includes a cyclic olefin resin (A), a linear low-density polyethylene (B), and a fatty acid metal salt (C).

The cyclic olefin resin is not particularly limited as long as it contains a cyclic olefin component as a copolymerization component and is a polyolefin resin containing a cyclic olefin component in the main chain. Examples thereof include addition polymers of cyclic olefins or hydrogenated products thereof, addition copolymers of cyclic olefins and α-olefins or hydrogenated products thereof.

The cyclic olefin resin includes those obtained by grafting and / or copolymerizing the above polymer with an unsaturated compound having a hydrophilic group.

Examples of the polar group include a carboxyl group, an acid anhydride group, an epoxy group, an amino group, an amide group, an ester group, a hydroxyl group, a sulfo group, a phosphono group, and a phosphino group. Examples of the saturated compound include (meth) acrylic acid, maleic acid, maleic anhydride, itaconic anhydride, glycidyl (meth) acrylate, alkyl (meth) acrylate (carbon number 1 to 10) ester, alkyl maleate (carbon number 1 -10) Esters, (meth) acrylamides, 2-hydroxyethyl (meth) acrylates, and the like.

The cyclic olefin resin is preferably an addition copolymer of a cyclic olefin and an α-olefin or a hydrogenated product thereof.

Further, as the cyclic olefin resin containing a cyclic olefin component as a copolymerization component, a commercially available resin can also be used. Commercially available cyclic olefin resins include, for example, TOPAS (registered trademark) (Topas Advanced Polymers), Apel (registered trademark) (manufactured by Mitsui Chemicals), Zeonex (registered trademark) (manufactured by Nippon Zeon), and Zeonore. (Registered trademark) (manufactured by Zeon Corporation), Arton (registered trademark) (manufactured by JSR Corporation), and the like.

Particularly preferable examples of the addition copolymer of cyclic olefin and α-olefin include: [1] an α-olefin component having 2 to 20 carbon atoms; and [2] a cyclic olefin component represented by the following general formula (I): Can be mentioned.

(Wherein R ¹ to R ¹² may be the same or different and are each selected from the group consisting of a hydrogen atom, a halogen atom, and a hydrocarbon group;
R ⁹ and R ¹⁰ , R ¹¹ and R ¹² may be integrated to form a divalent hydrocarbon group,
R ⁹ or R ¹⁰ and R ¹¹ or R ¹² may form a ring with each other.
N represents 0 or a positive integer;
When n is 2 or more, R ⁵ to R ⁸ may be the same or different in each repeating unit. )

[1] The α-olefin component having 2 to 20 carbon atoms will be described. The α-olefin having 2 to 20 carbon atoms is not particularly limited. For example, the same ones as in JP2007-302722 can be mentioned. These α-olefin components may be used alone or in combination of two or more. Of these, ethylene is most preferably used alone.

[2] The cyclic olefin component represented by the general formula (I) will be described. R ¹ to R ¹² in the general formula (I) may be the same or different and are selected from the group consisting of a hydrogen atom, a halogen atom, and a hydrocarbon group.

Specific examples of R ¹ to R ⁸ include, for example, a hydrogen atom; a halogen atom such as fluorine, chlorine and bromine; a lower alkyl group such as a methyl group, an ethyl group, a propyl group and a butyl group. May be different from each other, may be partially different, or all may be the same.

Specific examples of R ⁹ to R ¹² include, for example, hydrogen atom; halogen atom such as fluorine, chlorine, bromine; methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, hexyl group, stearyl. Alkyl group such as cyclohexyl group; cycloalkyl group such as cyclohexyl group; substituted or unsubstituted aromatic hydrocarbon group such as phenyl group, tolyl group, ethylphenyl group, isopropylphenyl group, naphthyl group, anthryl group; benzyl group, phenethyl And an aralkyl group in which an aryl group is substituted with an alkyl group, and the like. These may be different from each other, may be partially different, or all may be the same.

Specific examples of the case where R ⁹ and R ¹⁰ or R ¹¹ and R ¹² are integrated to form a divalent hydrocarbon group include, for example, alkylidene groups such as an ethylidene group, a propylidene group, and an isopropylidene group. Can be mentioned.

When R ⁹ or R ¹⁰ and R ¹¹ or R ¹² form a ring with each other, the formed ring may be monocyclic or polycyclic, or may be a polycyclic ring having a bridge. , A ring having a double bond, or a ring composed of a combination of these rings may be used. Moreover, these rings may have a substituent such as a methyl group.

Specific examples of the cyclic olefin component represented by the general formula (I) include those similar to those described in JP-A-2007-302722.

These cyclic olefin components may be used singly or in combination of two or more. Among these, it is preferable to use bicyclo [2.2.1] hept-2-ene (common name: norbornene) alone.

[1] A method for polymerizing an α-olefin component having 2 to 20 carbon atoms and a [2] cyclic olefin component represented by formula (I) and a method for hydrogenating the obtained polymer are particularly limited. Instead, it can be carried out according to known methods. Random copolymerization or block copolymerization may be used, but random copolymerization is preferred.

The polymerization catalyst used is not particularly limited, and a cyclic olefin resin can be obtained by a known method using a conventionally known catalyst such as a Ziegler-Natta, metathesis, or metallocene catalyst.

Next, the other copolymer components will be briefly described. The cyclic olefin resin is necessary as long as the object of the present invention is not impaired, in addition to the above [1] α-olefin component having 2 to 20 carbon atoms and [2] the cyclic olefin component represented by the general formula (I). Depending on the case, it may contain other copolymerizable unsaturated monomer components.

The unsaturated monomer that may be optionally copolymerized is not particularly limited, and examples thereof include hydrocarbon monomers containing two or more carbon-carbon double bonds in one molecule. Can be mentioned. Specific examples of the hydrocarbon monomer having two or more carbon-carbon double bonds in one molecule include those similar to those described in JP-A-2007-302722.

The glass transition point (Tg) of the cyclic olefin resin (A) is preferably 120 ° C. or lower, more preferably 30 ° C. to 80 ° C. In addition, the glass transition point (Tg) employ | adopts the value measured on DSC method (method of JIS K7121 description) on temperature rise rate 10 degree-C / min conditions. If it is 120 degrees C or less, since the content of the repeating unit derived from a cyclic olefin will decrease, a viscosity characteristic will be easy to improve.

The content of the cyclic olefin resin (A) in the cyclic olefin resin composition is 40% by mass to 95% by mass. More preferably, it is 50% by mass to 80% by mass. However, the above range varies somewhat depending on the cyclic olefin resin used. Moreover, you may adjust content of cyclic olefin resin (A) suitably according to the use of the resin molding manufactured.

The melt tension of the cyclic olefin resin is preferably 10 mN or more and 70 mN or less. When the melt tension is 10 mN or more, it is preferable because unevenness of the thickness of the resin molded body is less likely to occur. When the melt tension is 70 mN or less, it is easy to suppress the occurrence of scum and the surface of the resin molded body is less likely to be rough. Is preferable. A more preferable range of the melt tension is 25 mN or more and 50 mN or less. When two or more kinds of cyclic olefin resins are contained, the main component (50% by mass or more when the total cyclic olefin resin is 100% by mass) is the main component of the cyclic olefin resin having a melt tension in the above range. Is preferred. The melt tension is a value measured at 190 ° C. and a winding speed of 15 m / min.

The linear low density polyethylene (B) is not particularly limited, and a conventionally known one can be used. Examples thereof include linear low density polyethylene polymerized using a metallocene catalyst and linear low density polyethylene synthesized using a Ziegler-Natta catalyst. In the present invention, linear low density polyethylene polymerized using a metallocene catalyst is preferred. This is because the compatibility with the cyclic olefin resin (A) produced using the metallocene catalyst is high.

The content of the linear low density polyethylene (B) in the cyclic olefin resin composition is 5% by mass or more and 60% by mass or less. Compared with the case where the cyclic olefin resin is molded, the content of the component (B) is 5% by mass or more, so that it is very likely to occur. According to the production method of the present invention, (B) Even if the content of the component is 5% by mass or more, it is possible to suppress the problem of the occurrence of scouring. If content of (B) component is 60 mass% or less, since content of cyclic olefin resin (A) in a resin composition can be made into a fixed level or more, the property of cyclic olefin resin tends to appear in a resin composition. . Moreover, it is preferable that content of (B) component is 20 to 50 mass%.

The melt tension of the linear low density polyethylene (B) is preferably 40 mN or less. If the melt tension of the component (B) is in the above range, the moldability is improved, such as the thickness of the resin molded body is stabilized due to the difference between the melt tension of the component (B) and the melt tension of the cyclic olefin resin composition described later. improves. More preferably, the melt tension of the component (B) is 30 mN or less. However, from the standpoint of maintaining good thickness stability and gloss, the melt tension is preferably a certain amount. For this reason, it is preferable that the melt tension of (B) component is 5 mN or more.

The melt flow rate (MFR) of the linear low density polyethylene (B) is preferably 0.5 g / 10 min or more and 10 g / 10 min or less. In the case of 0.5 g / 10 min or more, the other components in the cyclic olefin resin composition and the component (B) are easily kneaded, the dispersion of the component (B) is improved, and a homogeneous blend polymer is obtained. It is preferable because it tends to be a resin molded body having a good surface condition. In addition, when the viscosity is 10 g / 10 min or less, the melt viscosity does not become too low, and the resin composition film discharged from the die can be constantly cast, and the film having a constant thickness and width can be wound. In addition, it is preferable because the strength and other physical properties of the molded body tend to be improved and the specified value can be achieved.

The fatty acid metal salt (C) is not particularly limited, and the fatty acid constituting the component (C) may be a saturated fatty acid or an unsaturated fatty acid. Also, those in which some hydrogen atoms are substituted with a substituent such as a hydroxyl group can be used. Examples of such fatty acids include monovalent or divalent fatty acids having 10 or more carbon atoms, such as monovalent saturated fatty acids having 10 or more carbon atoms [capric acid, lauric acid, myristic acid, pentadecylic acid, palmitic acid, stearic acid. C10-34 saturated fatty acids such as arachidic acid, behenic acid and montanic acid], monovalent unsaturated fatty acids having 10 or more carbon atoms [C10-34 such as oleic acid, linoleic acid, linolenic acid, arachidonic acid, erucic acid, etc. Unsaturated fatty acids and the like], divalent fatty acids having 10 or more carbon atoms (dibasic fatty acids) [divalent C10-30 saturated fatty acids such as sebacic acid, dodecanedioic acid, tetradecanedioic acid, and tapsia acid, decenedioic acid, And divalent C10-30 unsaturated fatty acids such as dodecenedioic acid].

(C) The metal constituting the fatty acid metal salt is preferably an alkaline earth metal, and examples thereof include calcium, magnesium, barium, and strontium. Moreover, zinc is also preferable as a metal constituting the metal salt.

The content of the (C) fatty acid metal salt in the cyclic olefin resin composition is 5 ppm or more and 2000 ppm or less. The content of the component (C) being 5 ppm or more contributes to the suppression of the occurrence of scouring. When the content of the component (C) is 2000 ppm or less, the problem that the resin molded body is colored due to the large content of the component (C) and the problem that gas is generated during molding of the resin molded body are less likely to occur. More preferable content of the component (C) is 10 ppm or more and 500 ppm or less. The unit of the content of the component (C) is ppm by mass, and the mass when the total of the content (mass) of the component (A) and the content (mass) of the component (B) is 100% by mass. ppm.

Although the essential components contained in the cyclic olefin resin composition have been described above, other components may be contained in the cyclic olefin resin composition as long as the effects of the present invention are not impaired. Examples of other components include other resins, inorganic fillers, nucleating agents, pigments, antioxidants, stabilizers, plasticizers, lubricants, mold release agents, and the like.

Further, the production method of the cyclic olefin resin composition as a raw material is not particularly limited, but the cyclic olefin resin composition can be produced by mixing the above components. The mixing method is not particularly limited, and it may be pre-compounded using an extruder or the like in advance, or each component may be dry blended and fed into an extruder or the like. Alternatively, the cyclic olefin resin (A) and the linear low density polyethylene (B) may be pre-compounded to produce a cyclic olefin resin composition, and the fatty acid metal salt (C) powder may be externally added thereto.

The present invention uses the cyclic olefin resin composition produced as described above as a raw material. The physical properties of the cyclic olefin resin composition are as follows.

The melt tension of the cyclic olefin resin composition measured by the method described later is preferably 10 mN or more, and more preferably 10 mN or more and 60 mN or less. When the melt tension is 10 mN or more, the effect of stabilizing the thickness of the molded body is high, and an extremely high quality resin molded body can be obtained. When the melt tension of the resin composition is 60 mN or less, the molten resin composition that has exited the die is less likely to expand (die swell), and as a result, deposits (meani) remain on the periphery of the die. It becomes difficult.

The melt flow rate of the cyclic olefin resin composition at 190 ° C. and a load of 2.16 kg, measured by a method according to JIS K7210, is preferably 0.1 g / 10 min or more and 15 g / 10 min or less. More preferably, it is 0.5 g / 10 min or more and 8 g / 10 min or less. If it is 0.1 g / 10 min or more, it is preferable because the fluidity is high and it is easy to mold, and if it is 15 g / 10 min or less, extrusion molding is facilitated.

[Production conditions for resin moldings]
In the production method of the present invention, the resin temperature when the cyclic olefin resin composition is discharged from the die using an extruder equipped with a die is set to the glass transition point (Tg) of the cyclic olefin resin (A) + 100 ° C. or more and Tg + 160. Adjust to the range below ℃. Even when a plurality of types of cyclic olefin resins (A) are included, in the resin composition of the present invention, the Tg derived from the cyclic olefin resin is obtained at one point, and therefore the resin temperature is adjusted based on the Tg. .

“The resin temperature when the cyclic olefin resin composition is discharged from the lip portion of the die” refers to an actual measurement value of the temperature of the resin composition when discharged from the lip portion of the die. When this measured value is in the above range, it is possible to suppress the adherence of the sealant to the lip portion of the die.

The resin temperature can be adjusted by controlling the heat applied to the resin composition during extrusion molding. For example, the resin temperature can be adjusted by adjusting the cylinder temperature, die temperature, and screw rotation speed of the extruder. Specifically, the resin temperature tends to increase as the cylinder temperature or the die temperature increases. Moreover, the resin temperature tends to increase as the screw rotation speed increases.

The cylinder temperature, die temperature, and screw rotation speed for adjusting the resin temperature in the range of Tg + 100 ° C. or more and Tg + 160 ° C. or less vary depending on the content ratio of the components contained in the cyclic olefin resin composition. The temperature (feed side) is preferably 230 ° C. or higher and 350 ° C. or lower, the cylinder temperature (die side) is preferably 150 ° C. or higher and 250 ° C. or lower, and the die temperature is preferably 150 ° C. or higher and 220 ° C. or lower.

Generally, it is known that when a resin molded body such as a film or fiber is taken up at a high speed, a regular thickness variation called “draw resonance” occurs in the take-up direction of the film. When draw resonance occurs, problems such as unevenness in the thickness of a resin molded body such as a film or instability in fiber thickness may occur. In order to suppress the occurrence of draw resonance, it is required that the resin composition has a high melt tension. However, in the case of a conventional resin composition, if the melt tension is too high, the molten resin composition that has exited the die has a strong tendency to expand (die swell), and it tends to generate a sag. According to the present invention, since the cyclic olefin resin composition contains a specific component in a specific ratio and the resin temperature is adjusted to a specific range, the melt tension of the resin composition is set to a relatively high value. However, it is possible to suppress the occurrence of the problem that the mains adhere to the lip portion of the die. As a result, it is possible to perform extrusion molding continuously for a long time. “High speed” in the case of “trying to take up a resin molded body such as a film or fiber at high speed” means that the take-up speed is in the range of 5 m / min to 50 m / min (particularly 20 m / min to 50 m / min). Range).

Hereinafter, although an example and a comparative example are shown and the present invention is explained concretely, the present invention is not limited to these examples.

<Material>
Cyclic olefin resin (A)
“9506F-04” (Topas Advanced Polymers, glass transition point 65 ° C., melt tension 26.2 mN)
"8007F-04" (Topas Advanced Polymers, glass transition point 78 ° C, melt tension 34.0mN)
“6013F-04” (Topas Advanced Polymers, glass transition point 135 ° C.)
Linear low density polyethylene (B)
“SP2320” (manufactured by Prime Polymer, MFR measured by the method described later is 1.9 g / 10 min, melt tension is 27.6 mN)
“SP1520” (manufactured by Prime Polymer, MFR measured by the method described later is 2.0 g / 10 min, melt tension is 6.7 mN)
Fatty acid metal salt (C)
Calcium stearate master batch Master batch containing 99.7% by mass of the above 9506F-04 and 0.3% by mass of calcium stearate

<Manufacture of cyclic olefin resin composition>
The materials and ratios shown in Table 1 (units are parts by mass, ppm of component (C) only) were melt-kneaded at a cylinder temperature of 250 ° C. using a twin-screw extruder (TEX30 manufactured by Nippon Steel Works), Examples and A cyclic olefin resin composition pellet for melt extrusion of a comparative example was obtained. In addition, although the glass transition point of cyclic olefin resin (A) was described in Table 1, the glass transition point regarding the example containing two types of cyclic olefin resins is two types of cyclic olefin resins described in Table 1 in Table 1. It is the value obtained by measuring by the above-mentioned method (DSC method (method described in JIS K7121), temperature rising rate of 10 ° C./min) using the sample included at the stated ratio.

<Evaluation of MFR>
MFR was measured according to JIS K7210 at a temperature of 190 ° C. with a load of 2.16 kgf. The measurement results are shown in Table 1.

<Melt tension>
The melt tension was obtained by using a Capillograph 1B (piston diameter 10 mm) manufactured by Toyo Seiki, using an orifice with an inner diameter of 1 mm and a length of 20 mm, and the molten polymer discharged from the orifice under the conditions of an extrusion speed of 190 ° C. and 10 mm / min. The tension (mN) applied to the fiber when it was taken up into a fiber at / min was measured. The measurement results are shown in Table 1.

<Film forming>
The cyclic olefin resin composition for melt extrusion of the obtained Examples and Comparative Examples was formed into a strip-shaped sheet having a thickness of 200 μm by a 30 mmφ twin screw extruder having a slit die of 30 mm × 1 mm under the molding conditions shown in Table 1. Continuous molding. In addition, the die lip discharge resin temperature in the following molding conditions was measured by dripping the molten resin from the slit die with the cooling roll retracted, and contacting the thermocouple thermometer with the resin.

[Die deposit amount]
A method for evaluating the die deposit amount will be described with reference to FIG. Fig.1 (a) is a figure which shows a mode that a film is extruded. FIG.1 (b) is a figure which shows typically a mode that die adhesion amount is evaluated. The lip part of the die 2.5 hours after the start of extrusion is observed from below, and the ratio of the resin composition to the entire length from one end of the lip part to the other end (the ratio of the adherence) Expressed as a percentage. For Examples 1 to 4 and Comparative Examples 1 and 2, the relationship between the total length and the length to which the resin composition adhered is shown in FIG. The ratio of the total length of the resin composition attached to the total length was used as a criterion for evaluation. 2A is Example 1, (b) is Example 2, (c) is Comparative Example 1, (d) is Example 3, (e) is Comparative Example 2, and (f) is Example. 4.

As shown in Table 1, it was confirmed that the occurrence of scouring can be suppressed by adjusting the resin temperature when the cyclic olefin resin composition is discharged from the lip portion of the die to a specific range.

In addition, using the material of Example 4, 150 μm, 75 μm, and 50 μm thick sheets were continuously formed by a sheet molding machine having a 40 mmφ single-screw extruder and a 420 mm wide T-die. Molding was performed under the following molding conditions.
[Molding condition]
Extruder cylinder temperature: 200 ° C
Die temperature: 180 ° C
Air gap: 100mm
Chill roll temperature: 60 ° C
Die lip discharge resin measured temperature: 205 ° C
Take-up speed and film thickness: 5 m / min for a 150 μm thick sheet, 8 m / min for a 75 μm thick sheet, 12 m / min for a 50 μm thick sheet

Extrusion was carried out continuously for 8 hours, but no cracking occurred. It has been confirmed that the effects of the present invention can be obtained even if extrusion molding is performed for a long time. In addition, it was confirmed that the effects of the present invention were exhibited regardless of the size of the molded body.

Claims

A method for producing a resin molded body that suppresses adhesion of deposits to the lip portion of the die during the production of the resin molded body,
A cyclic olefin resin (A) containing an α-olefin as a copolymerization component;
Linear low density polyethylene (B);
A fatty acid metal salt (C),
Content of the said cyclic olefin resin (A) is 40 mass% or more and 95 mass% or less,
The content of the linear low-density polyethylene (B) is 5% by mass or more and 60% by mass or less,
The cyclic olefin resin composition having a content of the fatty acid metal salt (C) of 5 ppm or more and 2000 ppm or less, when the cyclic olefin resin composition is discharged from the lip portion of the die using an extruder equipped with a die. A method for producing a resin molded body, wherein the resin temperature is adjusted to a glass transition point (Tg) of a cyclic olefin resin + 100 ° C. or higher and Tg + 160 ° C. or lower to form a resin molded body.
The melt tension of the cyclic olefin resin composition measured at 190 ° C. and a winding speed of 15 m / min is 10 mN or more,
The method for producing a resin molded body according to claim 1, wherein a melt flow rate of the cyclic olefin resin composition at 190 ° C and a load of 2.16 kg is 0.1 g / 10 min or more and 15 g / 10 min or less.
The method for producing a resin molded body according to claim 1 or 2, wherein the take-up speed of the resin molded body is 5 m / min or more and 50 m / min or less.
The method for producing a resin molded body according to any one of claims 1 to 3, wherein the linear low density polyethylene (B) is a linear low density polyethylene obtained by polymerization using a metallocene catalyst.
The method for producing a resin molded body according to any one of claims 1 to 4, wherein the fatty acid metal salt (C) is calcium stearate.