WO2012002704A2

WO2012002704A2 - Nylon film for pouch

Info

Publication number: WO2012002704A2
Application number: PCT/KR2011/004714
Authority: WO
Inventors: Hyun Cho; Gi Sang Song; Si Min Kim
Original assignee: Kolon Industries Inc
Current assignee: Kolon Industries Inc
Priority date: 2010-06-29
Filing date: 2011-06-28
Publication date: 2012-01-05
Anticipated expiration: 2012-12-29
Also published as: WO2012002704A3

Abstract

Provided is a film having good slipping property due to low frictional coefficient thereof as well as excellent processibility during post processes and excellent pouch deep-ability at the time of producing a pouch form due to low modulus thereof.

Description

NYLON FILM FOR POUCH

The present invention relates to a film having good slipping property due to low frictional coefficient thereof as well as excellent processibility during post processes and excellent pouch deep-ability(pouch depth forming property) at the time of producing a pouch form due to low modulus thereof.

More particularly, the present invention relates to a film having low frictional coefficient and low modulus by compounding inorganic particles and organic particles having different types and different particle sizes to prepare a master batch, and inputting the master batch at the time of a process to manufacture the film by using a tubular type film manufacturing device, and relates to a nylon film having excellent processibility in preparing of encapsulant and improved pouch deep-ability.

A nylon film has superior gas barrier property to other films, and thus it is mostly used as materials for vacuum packages, balloon, and the like, and recently used for a pouch for chemical packaging or secondary battery.

Meanwhile, a small amount of additive is added in order to prevent blocking and winding wrinkles during a stretching process or a heat treatment process when the nylon film is manufactured. Respective films have more or less different properties according to the kinds thereof, but they need to have high-speed productivity and slitting property and allowing easy processes for printing, laminating, and the like, during post processes, as well as respective physical properties thereof.

If the films do not have easiness in production and post-processibility, they are difficult to use commercially in spite of excellent properties thereof, and therefore, suitability for post processes and slipping property of the films are important.

In other words, much moisture is absorbed on a surface of the nylon film with the increase in moisture absorption of the nylon film, which increases the frictional coefficient of the nylon film and thus causes a decline in slipping property. This problem deteriorates traveling ability and workability during post processes such as slitting, printing, laminating, and the like. This deteriorates workability remarkably as well as decreases production yield with the increase in defects, thereby increasing the manufacturing costs, and thus, improvement in the slipping property is required.

In order to improve this slipping property, fine unevenness may be formed on a surface of the film to reduce the contact area with the film, or a surface of the film may be heterogenized by a material having superior activity.

As examples of the method for improving slipping property by forming fine unevenness on a surface of the film to reduce the contact area and thus to decrease frictional coefficient, there are a method of forming unevenness on a surface of the film by growth of spherulites due to slow cooling at the time of extrusion-manufacturing the film (Japanese Patent Laid-Open Publication No. Sho 51-7708), a method of forming unevenness on a surface of the film by growth of spherulites due to addition of crystal nucleating agent (Japanese Patent Laid-Open Publication No. Sho 52-41925), a method of coating silica or fine talc powder directly on a surface of the film (Japanese Patent Laid-Open Publication No. Sho 48-33991), a method of obtaining the film by performing addition of inorganic particles at the time of polymerizing polymer and manufacturing the film, and the like. Besides, embossing processing, matt processing, and the like are known.

In addition, for improving the slipping property by heterogenizing a surface of the film using a material having superior activity, a method is known that a raw material, into which another material having superior activity, such as wax or bisamide, fluorocarbon resin, or the like is mixed, is used to form a film or coat directly on a surface of the film.

However, the above methods may improve slipping property, but cause many problems with respect to the manufacturing process or uniformity in quality. The method by slow cooling at the time of extrusion-forming the film remarkably deteriorates workability since conditions for manufacturing the film are limited, and the method of coating fine powder on a surface of the film worsens the working environment and has difficulty in regulating the coating amount or treating foreign particles. Furthermore, embossing processing, matt processing, chemical treatment, or the like requires complicated processes, which causes an increase in costs, and deteriorates physical properties of the film such as transparency and surface gloss. Furthermore, the method of using a raw material into which wax or fluorocarbon resin is mixed causes adhesion defects in printing or laminating during post processes.

Furthermore, the method of adding inorganic particles at the time of polymerization has superior advantages such as reduction in manufacturing costs, but has problems in that even inorganic particles are extracted during an extracting process at the time of polymerization and particles become broken or molten due to a process for improving dispersibility under the conditions of high temperature and high alkali over a long period of time.

The film, basically, requires high adhesive strength in most post processes such as printing, laminating, depositing, and the like. This adhesive strength fundamentally depends on a chemical structure of a surface of a base film, but largely depends on a physical shape of the surface under the same chemical component.

Actually, if a slipping agent is large, the frictional coefficient can be easily lowered even though the slipping agent is slightly added, but the adhesive strength has been determined mainly in view of chemistry, and thus neglected. As such, component, size, shape, and the like of the slipping agent has been of interest considering the slipping property, but in fact, effects of the slipping agent on adhesive strength of the surface in post processes are neglected.

However, protrusions of the surface are improved by particles used in the slipping agent, resulting in an increase in contact area with the surface, thereby leading to improvement in adhesive strength, such as adhesive strength in printing or laminating and adhesion in deposition, during the post processes.

In particular, the nylon film used for a pouch for chemical package or secondary battery requires high slipping property described above, low modulus, and soft characteristics, and moreover, a depth of the pouch form is significantly important.

An object of the present invention is to provide a nylon film having improved slipping property due to a lowered frictional coefficient and having excellent post-processibility due to soft film characteristic.

In one general aspect, a nylon film according to the present invention includes inorganic particles (A) and organic particles (B) each having an average particle size of 1 to 5㎛, and inorganic particles (C) having an average particle size of 0.05 to 2㎛, wherein the nylon film has total content of inorganic particles in the range of 1600 to 13000ppm, a frictional coefficient according to ASTM D1894 of 0.05 to 0.3, a modulus according to ASTM D882 of 250 to 350kg/㎠, and a film haze according to ASTM D1003 of 10 to 50.

According to the nylon film of the present invention, nylon having a relative viscosity of 2.6 to 3.5 is used as a base resin, and a particle master batch is prepared by compounding the inorganic particles (A) and the organic particles (B) each having an average particle size of 1 to 5㎛ and a shape close to a sphere, and the inorganic particles (C) having an average particle size of 0.05 to 2㎛ and an irregular lump shape. The particle master batch is extruded by using a circular die and biaxially stretched in a tubular manner, thereby manufacturing the nylon film.

The present inventors found that the above three particles are mixed and used, to obtain unexpected effects, such as improvement in post-processability due to a very lowered frictional coefficient and heightened adhesive strength for coating and printing, which led to the completion of the present invention.

Herein, the particle master batch may be prepared by inputting the inorganic particles (A), the organic particles (B), and the inorganic particles (C), separately or altogether. The inorganic particle (A) and the inorganic particle (C) are selected from zeolite, alumina, silica, and kaolin, and as the organic particle (B), an acrylic-based, styrene-based, or silicon-based polymer particle may be used. More specifically, natural or synthetic zeolite composed of silicate of aluminum, alumina, silica, or the like may be used as the inorganic particle (A). The organic particle (B) is in a synthetic bead type, and may employ polymethyl(meth)acrylate or polystyrene, silicone, or the like. The inorganic particle (C) may employ kaolin, silica, or the like.

The prepared particle master batch is added in a process for manufacturing a nylon film to produce a film containing 100 to 1000ppm of the inorganic particles (A), 1000 to 10,000ppm of the organic particles (B), and 500 to 2000ppm of the inorganic particles (C). The process for manufacturing a film may be performed in a tubular type which is a simultaneous biaxial stretching type. The formed film has a machine direction (MD) modulus of 250~400kg/㎟.

The present invention will be described in detail as follows.

The present invention is directed to a nylon film obtained by adding a particle master batch containing inorganic particles in order to improve the slipping property thereof. Here, three kinds of inorganic particles having different shapes and different sizes as the inorganic particles.

First, the inorganic particles (A) and the organic particles (B) each have an average particle size of 1 to 5㎛ and a spherical shape. In addition, since they have a superior performance of forming unevenness on a film surface, they have an excellent effect in improvement of the slipping property. However, if the adding amount thereof is increased, the formed film has an increased haze. As for the inorganic particle (A) and the organic particle (B) having a shape close to sphere, affinity between particles becomes relatively weak since they have a small surface area. This causes voids to be generated in an interface between the particles and the polymer in a case where a sheet having a form close to amorphousness is stretched, and these voids increase the haze. As for the inorganic particle (A) and the organic particle (B) having these characteristics, they are very expensive if sizes thereof are small, while they increase the haze of the film if sizes thereof are large. Therefore, in order to use the inorganic particles (A) and the organic particles (B) commercially, the amount of particles needs to be minimized within a range of haze required for the film. However, this leads to excellent slipping property, but since the number of protrusions formed on the surface of the film is small, the surface of the film is very smooth. As a result, a surface area of the film becomes small, and thus, a contact area of the film is decreased during the post processes, thereby bringing about reduction in adhesive strength.

According to the present invention, the inorganic particle (C) having different shape and size from the inorganic particle (A) and the organic particle (B) is also added together with the particles (A) and (B). The inorganic particle (C) has an irregular lump shape and an average size of 0.5 to 2㎛. As such, when the inorganic particles (C) are also added, a large number of protrusions can be formed as well as the contact area can be increased, thereby improving adhesive strength. Furthermore, this case has a more stable winding property of the film as compared with a case where only the inorganic particle (A) and the organic particle (B) are used. In addition, this case can improve the slipping property under high humidity. When large-sized inorganic particles are used, a large number of particles can not be used due to haze of the film, and thus, the number of particles is absolutely insufficient. As a result, excellent frictional characteristics are exhibited under low humidity, but an increase in frictional coefficient is very sharp. However, when the inorganic particles (C) are added, a large number of small protrusions are formed even under high humidity, thereby reducing the increase in the frictional coefficient.

The inorganic particles (A) and the organic particles (B) have an average particle size of 1 to 5㎛. If the average particle size thereof is smaller than 1㎛, an effect of forming unevenness is small after manufacturing the film, and thus the frictional coefficient can not be effectively decreased. Whereas, if the average particle size thereof is larger than 5㎛, fracture of the film may be increased due to particles at the time of manufacturing the film and haze of the film may be sharply increased.

The inorganic particles (C) has an average particle size of 0.05 to 2㎛ and an irregular lump shape. If the average particle size thereof is smaller than 0.05㎛, an effect of forming unevenness is small after manufacturing the film, thereby having difficulty in improving adhesive strength, and agglomeration occurs a lot in a compounding process at the time of preparing a master batch, thereby decreasing dispersibility. Whereas, if the average particle size thereof is larger than 2㎛, haze of the film may be sharply increased due to a large number of particles. The inorganic particle (C) preferably has a particle size of 1/100 to 1/25 that of the inorganic particle (A). If the particle size of the inorganic particle (C) is larger than 1/25 that of the inorganic particle (A), haze of the film is sharply increased and agglomeration easily occurs at the time of preparing a master batch or manufacturing a film due to the lump shape of the inorganic particle (C). These act as defects of the film, and thus, cause defects to be generated at the time of producing a cell pouch, later. Whereas, if the particle size of the inorganic particle (C) is smaller than 1/100 that of the inorganic particle (A), particle agglomeration occurs a lot at the time of preparing a master batch, thereby having difficulty in preparing the master batch. In addition, the nylon film used in compounding for the master batch preferably has a relative viscosity of 2.6 to 3.5 (measured by 95% sulfuric acid method). If the relative viscosity is lower than 2.6, particle dispersibility is excellent, but viscosity difference is large at the time of mixing with a base resin of the nylon film. As a result, network points, which are partially not printed or adhesive-coated, are generated at the time of printing or adhesive coating after manufacturing the film, resulting in deterioration in quality of the final products. Whereas, if the relative viscosity is larger than 3.5, particle dispersibility is decreased, thereby having difficulty in meeting the required physical properties of the film.

In addition, zeolite, alumina, silica, kaolin, Na₂O, CaO, or the like may be used as the inorganic particle (A) and the inorganic particle (C) in the present invention, and an acrylic-based, styrene-based, or silicone-based polymer particle may be used as the organic particle (B). These may be compounded alone or mixedly at the time of preparing a master batch.

The master batch prepared by using the inorganic particles (A), organic particles (B), and inorganic particles (C) preferably has a particle content of 0.5 to 30wt%. If the particle content is smaller than 0.5wt%, the amount of master batches to be prepared is increased, thereby having difficulty in maintaining the quality of master batches as well as increasing the costs for processing the master batches, and thus the preparing costs are increased. Whereas, if the particle content is larger than 30wt%, particle dispersibility is deteriorated and uniform quality of master batches are difficult to produce due to high content of particles. Moreover, particle dispersibility in the film is deteriorated and the amount of particles in the film is difficult to control. In addition, the inorganic particles as above are preferably contained in the range of 1600 to 13000ppm, based on total content of the film.

Furthermore, 100 to 1000ppm of the inorganic particles (A), 1000 to 10000ppm of the organic particles (B), and 500 to 2000ppm of the inorganic particles (C) may be contained.

If the content of the inorganic particles (A) is lower than 100ppm, winding property is largely deteriorated even though the content of the organic particles (B) having a large size is raised. Whereas, if the content of the inorganic particles is higher than 1000ppm, haze of the film is sharply increased without improvement of winding property or low-friction characteristics and the manufacturing costs.

If the content of the organic particles (B) is lower than 1000ppm, low-friction characteristics are difficult to realize even though the inorganic particle (A) having a large size is inputted in a large amount considering the haze. Whereas, if the content of the organic particles (B) is higher than 10000ppm, the slipping property is so high that winding is difficult, and haze of the film is sharply increased and the manufacturing costs are increased.

If the content of the inorganic particles (C) is lower than 500ppm, printing and adhering characteristics are largely deteriorated. Whereas, if the content of the inorganic particles (C) is higher than 2000ppm, the manufacturing costs are increased without improvement in the printing and adhering characteristics.

The nylon film of the present invention is not limited to Nylon 6, and may include nylon-based biaxially stretched film. Generally, the nylon film used in the present invention may have an appropriate thickness within a range of 5 to 50㎛, and the base resin employed in the nylon film has preferably a relative viscosity of 3.0 to 3.6. If the relative viscosity of the base film is lower than 3, physical properties of the nylon film after manufacturing are deteriorated. Whereas, if the relative viscosity of the base film is higher than 3.6, flow property of the base resin is not good at the time of melt extrusion, and stretch property is insufficient, which fails to meet required physical properties.

The present invention can provide a nylon film having a low frictional coefficient and a low modulus, and having a better effect in pouch deep-ability of a pouch form.

Hereinafter, the present invention will be in detail described by examples, but the present invention is not limited to the following examples.

Physical properties of the film of the present invention were measured by the following methods.

1) Frictional coefficient

Measurement method: ASTM D1894

Use instrument: Friction tester (Toyoseiki, Model TR type)

Measurement conditions: Measuring frictional coefficient of corona treated surface of nylon film

2) Modulus

Measurement method: ASTM D882

Use instrument: Instron 5566

Measurement conditions: Stretching rate 500mm/min, temperature 20℃, relative humididy 65%

Size of specimen: 15mm width, 100mm length

Determinationi of tensile stress at 2% strain after measurement according to the above method

3) Haze

Measurement method: ASTM D1003

Use instrument: Color and color difference meter

(Nopon denshoku, Model 1001DP)

[Example 1]

As shown in Table 1, 1wt% of spherical alumina (aspect ratio, 1.02) as an inorganic particle (A) component, 5wt% of PMMA bead (KOLON Diasphere) as an organic particle (B) component, and 2wt% of kaolin having an irregular lump shape as an inorganic particle (C) component, based on total wt% of master batch, were mixed into Nylon 6 having a relative viscosity of 3.3, and the resulting mixture was used to prepare a mixed master batch by using a twin screw type extruder at 245℃.

Then, the mixed master batch was mixed into Nylon 6 having a relative viscosity of 3.3 according to the contents as shown in Table 3. The resulting mixture was extruded at 265℃ by using a circular die, and simultaneously biaxially stretched at a stretching ration of 3 by 3 times in a tubular type, followed by thermal setting, thereby manufacturing a nylon film. In addition, aluminum foil was attached onto the manufactured film to produce a pouch form, and then the depth of the pouch form was measured.

The results were recorded in Table 3.

[Examples 2 to 6]

Each mixed master batch was prepared in the same method as Example 1, except that particle sizes and contents of inorganic particles (A), organic particles (B), and inorganic particles (C) were controlled and the relative viscosity of Nylon 6 was controlled as shown in Table 1.

Then, the mixed master batch was mixed into Nylon 6 having a relative viscosity of 3.3 in such a content as shown in Table 3. The resulting mixture was extruded at 265℃ by using a circular die, and simultaneously biaxially stretched at a stretching ration of 3 by 3 times in a tubular type, followed by thermal setting, thereby manufacturing a nylon film. In addition, aluminum foil was attached onto the manufactured film to produce a pouch form, and then the depth of the pouch form was measured and recorded in Table 3.

The results were recorded in Table 3.

[Example 7]

Spherical synthetic zeolite, as an inorganic particle (A) component, was mixed into Nylon 6 having a relative viscosity shown in Table1 such that it is contained in such a content as shown in Table1, based on total wt% of master batch, and the resulting mixture was used to prepare a master batch A by using a twin screw type extruder at 245℃, in like Example 1.

PMMA bead(KOLON Diasphere), as an organic particle (B) component, was also mixed into Nylon 6 having a relative viscosity shown in Table1 such that it is contained in such a content as shown in Table1, based on total wt% of master batch, and the resulting mixture was used to prepare a master batch B, in like Example 1.

Lump-shaped Kaolin, as an inorganic particle (C) component, was also mixed into Nylon 6 having a relative viscosity shown in Table1 such that it is contained in such a content as shown in Table 1, based on total wt% of master batch, and the resulting mixture was used to prepare a master batch C.

Then, the three prepared kinds of master batches were mixed into Nylon 6 having a relative viscosity of 3.3 in such a content as shown in Table 1. The resulting mixture was extruded by using a circular die, in like Example 1, and biaxially stretched in a tubular type, thereby manufacturing a nylon film. In addition, aluminum foil was attached onto the formed film to produce a pouch form, and then the depth of the pouch form was measured and recorded in Table 3.

The results were recorded in Table 3.

[Examples 8 to 12]

Each nylon film was manufactured in the same method as Example 7, except that the contents of inorganic particles (A), organic particles (B), and inorganic particles (C) to be added were verified as shown in Table 1. In addition, aluminum foil was attached onto the formed film to produce a pouch form, and then the depth of the pouch form was measured and recorded in Table 4.

The results were recorded in Table 4.

[Comparative examples 1 to 6]

For each comparative example, each master batch having the content as shown in Table 2 was prepared, and the master batch was used to manufacture a film, in like Example 1. The results were recorded in Table 4.

Table 1

Preparing method of master batch (% representing wt%)

Examples	Content of inorganic particles (A)	Particle size of inorganic particles (A)	Content of organic particles(B)	Particle size of organic particles(B)	Content of inorganic particles (C)	Particle size of inorganic particles (C)	Relative viscosity of master batch resin	Remarks
1	1%	3㎛	5%	5㎛	2%	0.05㎛	3.3	mixed master batch
2	1%	3㎛	10%	5㎛	2%	0.05㎛	2.6	mixed master batch
3	5%	3㎛	30%	5㎛	15%	0.05㎛	3.1	mixed master batch
4	1%	2㎛	5%	5㎛	2%	0.08㎛	3.1	mixed master batch
5	1%	5㎛	5%	5㎛	2%	0.05㎛	3.1	mixed master batch
6	5%	5㎛	30%	5㎛	15%	0.2㎛	3.1	mixed master batch
7	1%	3㎛	5%	5㎛	2%	0.05㎛	3.3	Three kinds of unmixed master batch
8	1%	3㎛	10%	5㎛	2%	0.05㎛	2.6	Three kinds of unmixed master batch
9	5%	3㎛	30%	5㎛	15%	0.05㎛	3.1	Three kinds of unmixed master batch
10	5%	2㎛	30%	5㎛	15%	0.08㎛	3.1	Three kinds of unmixed master batch
11	1%	5㎛	5%	5㎛	2%	0.05㎛	3.1	Three kinds of unmixed master batch
12	1%	5㎛	5%	5㎛	2%	0.2㎛	3.1	Three kinds of unmixed master batch

Table 2

(% representing wt%)

		Content of inorganic particles (A)	Particle size of inorganic particles (A)	Content of organic particles (B)	Particle size of organic particles (B)	Content of inorganic particles (C)	Particle size of inorganic particles (C)	Relative viscosity of master batch resin	Remarks
Comparative examples	1	0.4%	3㎛	0.4%	5㎛	0.4%	0.05㎛	3.3	mixed master batch
	2	26%	3㎛	2%	5㎛	2%	0.05㎛	2.6	mixed master batch
	3	5%	5㎛	20%	5㎛	10%	0.3㎛	3.1	mixed master batch
	4	25%	3㎛	3%	5㎛	40%	0.05㎛	3.3	Unmixed master batch
	5	5%	3㎛	30%	5㎛	15%	0.05㎛	2.6	Unmixed master batch
	6	1%	5㎛	10%	5㎛	2%	0.3㎛	3.1	Unmixed master batch

Table 3

(% representing wt%)

	Input ratio of master batch	Amount of particles in film (ppm)				Frictional coefficient	Modulus(kg/㎠)	Haze	PouchDeep-ability(mm)
	Input ratio of master batch	Inorganic particles (A)	Organic particles (B)	Inorganic particles (C)	total	Frictional coefficient	Modulus(kg/㎠)	Haze	PouchDeep-ability(mm)
Example1	3%(Mixed)	300	1500	600	2400	0.28	280	20	6.9
Example2	4%(Mixed)	400	4000	800	5200	0.18	275	45	9
Example3	1%(Mixed)	500	3000	1500	5000	0.25	295	40	8.2
Example4	3%(Mixed)	300	1500	600	2400	0.28	281	25	6.8
Example5	4%(Mixed)	400	2000	800	3200	0.3	273	30	8
Example6	1%(Mixed)	500	3000	1500	5000	0.26	295	42	7.8
Comparative example1	5%(Mixed)	200	200	200	600	0.75	260	5	2
Comparative example2	0.5%(Mixed)	1300	100	100	1500	0.6	370	22	3
Comparative example3	0.5%(Mixed)	250	1000	500	1750	0.45	320	20	-

*Delamination between aluminum foil and comparative example 3 occurred at the time of producing a pouch form.

Table 4

(% representing wt%)

	Input ratio of master batch			Amount of particles in film (ppm)				Frictional coefficient	Modulus(kg/㎠)	Haze	PouchDeep-ability(mm)
	Master batch A	Master batch B	Master batchC	Amount of particles in film (ppm)
	Master batch A	Master batch B	Master batchC	Inorganic particles(A)	Organci particles(B)	Inorganic particles(C)	total
Example7	3%	3%	3%	300	1500	600	2400	0.28	270	20	7
Example8	4%	4%	4%	400	4000	800	5200	0.18	260	45	9.2
Example9	0.5%	0.5%	0.5%	250	1500	750	2500	0.3	300	25	8
Example10	1%	1%	1%	500	3000	1500	5000	0.25	290	40	9
Example11	2%	2%	2%	200	1000	400	1600	0.29	280	18	6.5
Example12	4%	4%	4%	400	2000	800	3200	0.26	260	28	7.3
Comparative example4	0.2%	2%	10%	500	1000	40000	41500	0.42	260	51	5
Comparative example5	0.1%	0.1%	0.1%	50	300	150	500	0.58	380	8	5
Comparative example6	4%	4%	4%	400	4000	800	5200	0.18	260	52	-

*Comparative example 6 was not usable as a cell pouch due to very high haze and lots of particle agglomeration defects thereof.

It was seen from the results of Tables 3 and 4 that the nylon film manufactured according to the present invention has lower frictional coefficient and lower modulus, and better pouch deep-ability of a pouch form.

Claims

A nylon film, comprising inorganic particles (A) and organic particles (B) each having an average particle size of 1 to 5㎛, and inorganic particles (C) having an average particle size of 0.05 to 2㎛, wherein the nylon film has total content of inorganic particles in the range of 1600 to 13000ppm, a frictional coefficient according to ASTM D1894 of 0.05 to 0.3, a modulus according to ASTM D882 of 250 to 350kg/㎠, and a film haze according to ASTM D1003 of 10 to 50.
The nylon film of claim 1, wherein the inorganic particle (A) and the inorganic particle (C) are selected from zeolite, alumina, silica, kaolin, Na₂O, and CaO, and the organic particle (B) is an acrylic-based, styrene-based, or silicone-based polymer particle.
The nylon film of claim 1, wherein each of the inorganic particle (A) and the organic particle (B) has a spherical shape, and the inorganic particle (C) has an irregular lump shape.
The nylon film of claim 1, wherein the inorganic particles (C) have an average particle size of 1/100 to 1/25 that of the inorganic particles (A).
The nylon film of any one selected from claims 1 to 4, wherein the nylon film contains 100 to 1000ppm of the inorganic particles (A), 1000 to 10000ppm of the organic particles (B), and 500 to 2000ppm of the inorganic particles (C).
The nylon film of claim 5, wherein the nylon film is manufactured by extrusion using a circular die and biaxial stretching in a tubular manner.