JP2001002779A - Polyamide having excellent drawability - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyamide having excellent drawability and especially suitable for successive biaxial drawing. SOLUTION: The objective polyamide contains a unit composed of a lactam and/or an aminocarboxylic acid, a unit composed of a dicarboxylic acid and a unit composed of a diamine containing norbornanediamine. Concretely, the polyamide contains 50-99.8 mol% lactam and/or aminocarboxylic acid, 0.1-25 mol% dicarboxylic acid and 0.1-25 mol% diamine. Norbornanediamine accounts for 10-100 mol% of the diamine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a novel polyamide having excellent stretchability. More specifically, the present invention relates to a polyamide using norbonanediamine for part or all of a diamine unit, and relates to a novel polyamide suitable for a stretched film, particularly, a successively biaxially stretched film.

[0002]

2. Description of the Related Art Polyamides are used as food packaging materials such as retort foods because of their excellent heat resistance and gas barrier properties. In recent years, with the expansion of the food packaging field, required characteristics have been diversified. For example, there is a demand for the production of a polyamide film which is thin and has excellent practical mechanical strength and gas barrier properties, particularly, a polyamide which has good productivity and is suitable for a sequential biaxial stretching method.

In general, it is known that a film obtained from a crystalline polymer is stretched to reduce the thickness of the film and to increase the mechanical strength per unit. By applying this stretching technique, a thin film having excellent mechanical strength is produced from many crystalline polymers. However, nylon 6 and nylon 66
Films, monofilaments, fibers, and the like obtained from crystalline polyamides such as those described above are known to cause uneven stretching or break at a relatively low stretching ratio unless the stretching conditions are controlled within a certain narrow range. In particular, when a nylon film is produced by a sequential biaxial stretching method which is considered to be advantageous for mass production of films, the first-stage stretching (hereinafter, referred to as “primary stretching”) in which the film is stretched in the extrusion direction is performed. After that, it is known that the second-stage stretching (hereinafter, referred to as “secondary stretching”) in which the stretching is performed in a direction perpendicular to the first-stage stretching direction is difficult. The reason for this is that during the primary stretching, the polyamide molecules are oriented parallel to the film surface, and hydrogen bonds are formed between the molecules, whereby crystallization progresses, the film becomes hard, and secondary stretching becomes difficult. It is thought to be. Therefore, development of a polyamide excellent in stretchability applicable to the sequential biaxial stretching method is desired.

Conventionally, many polyamide copolymers and polyamide compositions have been proposed for improving the stretchability of polyamide. As a polyamide copolymer having improved stretchability, for example, JP-A-53-5250 discloses a polyamide copolymer comprising epsilon caprolactam, hexamethylene isophthalamide and hexamethylene terephthalamide. JP-A-60-104312 proposes a polyamide comprising a polymerization product of at least a dicarboxylic acid and a diaminoalicyclic compound. Further, as the polyamide composition, for example, JP-A-52-10456
No. 5 proposes a composition in which an aliphatic polyamide is blended with a polyamide having xylylenediamine and α, ω-aliphatic dicarboxylic acid as constituent units. JP-A-53-88053 discloses a polyamide unit comprising an aliphatic polyamide, 2,2,4- and / or 2,4,4-trimethylhexamethylenediamine and an aromatic and / or alicyclic dicarboxylic acid. A method for producing a sequential biaxially stretched film from a blend with a polyamide containing 50 mol% or more has been proposed. JP-A-62-1273
JP-A-46-46196 discloses a polyamide composition comprising a blend of a copolymerized polyamide obtained from an aliphatic polyamide and a semi-aromatic polyamide, an aliphatic diamine and a semi-aromatic polyamide obtained from isophthalic acid and / or terephthalic acid. Has been proposed.

[0005] The polyamide copolymers and polyamide compositions proposed above are compared with single polyamides such as nylon 6,
Stretchability has been improved. However, when the stretching ratio of the film is 3 times or more, stretching unevenness may occur, and there is a limit to the stretching ratio that enables uniform stretching. Further, in the secondary stretching in the sequential biaxial stretching method, the stretchability was not sufficiently improved, for example, stretching unevenness was likely to occur or the film was broken at a low stretching ratio.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polyamide excellent in stretchability, particularly suitable for sequential biaxial stretchability.

[0007]

[Means for Solving the Problems] The present researchers have studied stretchability,
In particular, for the purpose of obtaining a polyamide excellent in sequential biaxial stretching properties, as a result of examining the relationship between the molecular structure of the polyamide and the stretching properties, it was found that a polyamide having a unit composed of norbornanediamine in the molecular chain was excellent in stretching properties, The present invention has been reached.

[0008] That is, the first invention of the present invention is a polyamide excellent in stretchability containing a unit composed of a lactam and / or an aminocarboxylic acid, a unit composed of a dicarboxylic acid, and a unit composed of a diamine containing norbornanediamine. .

The second invention of the present invention relates to a diamine of 10
The stretchable polyamide according to the first aspect, wherein 100 mol% is norbonanediamine.

[0010] The third invention of the present invention relates to a lactam and / or aminocarboxylic acid of 50 to 99.8 mol%, a diamine of 0.1 to 25 mol%, and a dicarboxylic acid of 0.1 to 25 mol%.
ol% of the polyamide, wherein 10
It is a polyamide having excellent stretchability in which about 100 mol% is norbonanediamine.

[0011] The reason why the polyamide containing norbornanediamine as a constituent component is excellent in stretchability, in particular, sequential biaxial stretchability, which has been conventionally difficult, is not sufficiently clear. However, the molecular structure of norbornanediamine has an aliphatic structure such as nylon 6 or the like. Due to the bulky molecular structure compared to polyamide, the norbornane structure introduced into the polyamide weakens the hydrogen bonding interaction between the polyamide molecules during stretching, suppresses the orientation of the polyamide molecules in the film plane, It is presumed that the conversion is suppressed. This indicates that when comparing the total molecular plane orientation of films having substantially the same stretching ratio obtained from the polyamide of the present invention containing norbornanediamine as an essential component and nylon 6, the polyamide of the present invention has a higher molecular plane. It is estimated as described above also from the low orientation.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
The polyamide of the present invention comprises a unit comprising a lactam and / or an aminocarboxylic acid, a unit comprising a dicarboxylic acid,
And a diamine unit containing norbornanediamine.

The lactam used in the present invention is ε-
Caprolactam, ω-enantholactam, ω-undecalactam, ω-dodecalactam, 2-pyrrolidone and the like. Examples of the aminocarboxylic acid include 6-aminocaproic acid, 7-aminoheptanoic acid, 8-aminooctanoic acid, 10-aminocapric acid, 11-aminoundecanoic acid, and 12-aminododecanoic acid. These lactams and amino acids may be used alone,
More than one kind may be used in appropriate combination. When lacram and aminocarboxylic acid are used in combination, they can be used in a mixture at any ratio. The stretchability of a polyamide copolymer comprising a polyamide derived from a lactam and / or an aminocarboxylic acid and a polyamide containing norbornanediamine can be improved even if the content of the latter is small.

Specific examples of the dicarboxylic acid used in the present invention include aliphatic dicarboxylic acids such as adipic acid, suberic acid, azelaic acid, sebacic acid and dodecanoic acid, and alicyclic dicarboxylic acids such as 1,4-dicarboxycyclohexane. ,
Examples thereof include aromatic dicarboxylic acids such as isophthalic acid, terephthalic acid, and naphthalenedicarboxylic acid. These dicarboxylic acids may be used alone or in combination of two or more.

The norbornanediamine used in the present invention includes, for example, 2,5-norbonanedimethylamine,
Examples thereof include 2,6-norbonane dimethylamine and a mixture thereof at an arbitrary ratio.

Examples of the diamine other than norbonane diamine include aliphatic diamines such as ethylene diamine, tetramethylene diamine, hexamethylene diamine, nonamethylene diamine, undecamethylene diamine, dodecamethylene diamine, bis (4-aminocyclohexyl) methane, bis (4-aminocyclohexyl) propane, 1,
Alicyclic diamines such as 3-bisaminomethylcyclohexane and 1,4-bisaminomethylcyclohexane; and aromatic diamines such as meta-xylylenediamine and para-xylylenediamine. These diamines can be used alone. Alternatively, two or more kinds may be used in appropriate combination. The dicarboxylic acid and the diamine containing norbonane diamine are used in approximately equimolar proportions.

The amount of lactam and / or aminocaproic acid used is 50 to 99.8 mol%, preferably 70 to 99.8 mol%.
99.5 mol%, and the amount of dicarboxylic acid is 0.1 to 25.
mol%, preferably 0.25 to 15 mol%, diamine 0.1 to 25 mol%, preferably 0.25 to 15 mol%.
mol%. In addition, 10-100m of this diamine
ol%, preferably 30 to 100 mol%, more preferably 50 to 100 mol% is norbonane diamine. If the amount of the lactam and / or aminocarboxylic acid is less than the above lower limit, the mechanical strength may decrease. In addition, if it exceeds the above upper limit, the stretchability may decrease. If the amount of norbonanediamine in the diamine is less than the above lower limit, the stretchability will decrease. On the other hand, if it exceeds the upper limit, stretchability is good, but practical properties such as mechanical strength are reduced.

The production of the polyamide according to the invention can be carried out batchwise,
It can also be performed in a continuous manner, such as a batch-type reactor, a single-tank or multi-tank-layer continuous reactor, a tubular continuous reactor, a single-screw kneading extruder, and a kneading reaction extruder such as a twin-screw kneading extruder.
A known polyamide manufacturing apparatus can be used. Known polymerization methods such as melt polymerization, solution polymerization and solid phase polymerization can be used as the polymerization method. These polymerization methods can be used alone or in an appropriate combination.

For example, a lactam and / or a diamine containing aminocarboxylic acid, dicarboxylic acid, norbornanediamine and water are charged into a pressure-resistant container and sealed in a sealed state for 200 to 200 hours.
After performing polycondensation under a pressure in a temperature range of 350 ° C., the pressure is reduced, and the polycondensation reaction is continued at a temperature range of 200 to 350 ° C. under an atmospheric pressure or a reduced pressure to increase the molecular weight. Polyamide can be produced. At this time, the diamine and the dicarboxylic acid may be directly charged in a pressure-resistant container, or an approximately equimolar amount of the diamine and the dicarboxylic acid are mixed and dissolved in water or alcohol, and then a nylon salt is formed. It may be charged in a concentrated solution state or in the form of a solid nylon salt obtained by recrystallization. As the water used in the present invention, it is desirable to use ion-exchanged water or distilled water from which oxygen has been removed.
It is generally 1 to 150 parts by weight based on parts by weight.

The high molecular weight polyamide is usually withdrawn from the reaction vessel in a molten state, cooled with water or the like, and then pelletized. In the case of pellets mainly composed of polyamide containing a large amount of unreacted monomers such as nylon 6, after removing unreacted monomers by hot water washing, they are used for production of films, monofilaments, fibers and the like. The polyamide of the present invention has a molecular weight of JI
The relative viscosity (η) measured by the method described in SK6810
r) is in the range of 1.5 to 5.0, preferably 2.0 to 4.0.
0. In addition, there is no special restriction on the kind of the terminal group of the polyamide and its concentration and molecular weight distribution.

When polymerizing the polyamide of the present invention, if necessary, phosphoric acid, phosphorous acid,
Phosphorus compounds such as hypophosphorous acid, polyphosphoric acid, and alkali metal salts thereof can be added. The addition amount of these phosphorus compounds is usually 50 to 3,000 ppm based on the polyamide to be obtained. In addition, to control the molecular weight and stabilize the melt viscosity during molding, laurylamine,
Amines such as stearylamine, hexamethylenediamine and meta-xylylenediamine, and carboxylic acids such as acetic acid, benzoic acid, stearic acid, hexanedionic acid, isophthalic acid and terephthalic acid can be added. The amount of use of these molecular weight regulators varies depending on the reactivity of the molecular weight regulator and the polymerization conditions, but is appropriately determined so that the relative viscosity of the polyamide finally obtained is in the range of 1.5 to 5.0. .

The film is produced from the polyamide of the present invention by a known film production method, for example, a T-die method using a melt extruder, an inflation method, a tubular method, a solvent casting method, a hot press method, or the like. it can. Further, monofilaments and fibers can be produced by a known melt spinning method. The melting temperature of polyamide in a method using a melt extruder or a melt spinning method is from the melting point of the polyamide used to 320 ° C.

In the case of producing a film by the sequential biaxial stretching method, if necessary, a lubricant such as calcium stearate, a bisamide compound, silica, talc, a slip agent, a nucleating agent and the like are added to the polyamide of the present invention. The polyamide is melt-extruded by an extruder equipped with a die to form an unstretched film. The unstretched film may be continuously stretched in a continuous process, or may be wound up and then stretched. The stretching is performed at a temperature equal to or higher than the glass transition temperature (hereinafter, referred to as “Tg”) of the polyamide to be used, and the primary stretching is performed at a stretching ratio of 2 to 5 times in a temperature range of Tg to (Tg + 50) ° C., preferably , 2.5 to 4 times, and then the secondary stretching is performed at the same temperature or slightly higher temperature as the primary stretching at a stretching ratio of 2 to 5 times, preferably 2.5 to 4 times. By heat setting at a temperature of 150 ° C. or more, a successively biaxially stretched film is manufactured.

As long as the effects of the present invention are not impaired, a heat stabilizer, an ultraviolet absorber, a light stabilizer,
Antioxidants, antistatic agents, tackifiers, sealant improvers, antifoggants, release agents, impact modifiers, plasticizers, pigments,
Dyes, fragrances, reinforcing materials and the like can be added.

The polyamide of the present invention is preferable as a material for a stretched film, and particularly suitable as a material for a sequential biaxially stretched film. It is used not only for films but also for monofilaments and fibers.
The stretchability of the fiber is also good. Further, the polyamide of the present invention can be used for the production of molded articles by injection molding, compression molding, vacuum molding or the like.

Hereinafter, the present invention will be described specifically with reference to Examples and Comparative Examples. The measured values shown in the examples and comparative examples were measured by the following methods.

1) Measurement of ηr (Relative Viscosity) of Polyamide According to JIS K6810, 98% by weight of concentrated sulfuric acid is used as a solvent at a polyamide concentration of 1% by weight and at a temperature of 25 ° C. using an Ubbelohde viscometer. It was measured.

2) Measurement of the degree of orientation of all molecular planes when the film is stretched in the extrusion direction of the film A biaxial stretching machine BIX-703 (Iwamoto Seisakusho) whose temperature is controlled to a predetermined atmospheric temperature (50 ° C., 60 ° C., 70 ° C.) The unstretched sample film having a length of 92 mm and a width of 92 mm was attached to the stretching tank of Example 1), preheated at ambient temperature (temperature at the time of stretching) for 20 seconds, and then 35 mm / sec or 1 mm in the film extrusion direction.
The film was stretched three times at a deformation speed of 40 mm / sec and heat-set at 200 ° C. to prepare a film for measuring the degree of orientation of all molecular planes.
The refractive index (Nx) in the stretching direction, the refractive index (Ny) in the width direction, and the refractive index (Nz) in the thickness direction of this film were measured using an automatic birefringence meter KOBRA-21ADH type (manufactured by Oji Scientific Instruments).
And the degree of orientation (P) of the total molecular plane orientation was determined by equation (1).

P = {(Nx + Ny) / 2} −Nz (1) (where P is the total molecular plane orientation of the stretched film, Nx is the refractive index in the stretching direction of the film, and Ny is the width in the width direction of the film). (The refractive index and Nz indicate the refractive index in the thickness direction.) The smaller the value of P, the smaller the orientation of the polyamide molecules and the better the stretchability.

3) Measurement of stretching ratio at break of secondary stretching by sequential biaxial stretching method Biaxial stretching machine BIX-7 adjusted to an ambient temperature of 60 ° C.
An unstretched sample film was attached to a stretching tank of type 03 (manufactured by Iwamoto Seisakusho) and preheated at ambient temperature (temperature during stretching) for 20 seconds, and then deformed at a deformation speed of 35 mm / sec or 140 mm / sec in the extrusion direction of the film. The film was subjected to primary stretching at a magnification of 0.0, and then subjected to secondary stretching at a deformation speed of 35 mm / sec until the film was broken, and the stretching ratio at the time of breaking was measured.

Example 1 In a 5 liter pressure vessel equipped with a stirrer, thermometer, pressure gauge, pressure controller and polymer outlet, 2200 g of ε-caprolactam and norbornanediamine (NBDA manufactured by Mitsui Chemicals, Inc., trade name: NBDA) 40 0.0g, adipic acid 3
7.9 g and 114 g of distilled water were charged, and nitrogen pressurization and depressurization were repeated several times.
The temperature was raised to 0 ° C. After reacting at 240 ° C. with stirring for 4 hours, the temperature was raised to 270 ° C., and then the pressure was released to a gauge pressure of 0 MPa over 2 hours.
The mixture was reacted at 270 ° C. for 2.25 hours with stirring while flowing in minutes. Next, the stirring was stopped, the polyamide in a molten state was pulled out from the polymer outlet in a string form, cooled with water, and then pelletized to obtain about 1800 g of pellets. The pellets were washed for 12 hours under flowing hot water of 95 ° C, and then washed at 80 ° C.
And vacuum dried for 24 hours. Ηr of the obtained polyamide
Was 3.24. 1500 g of the obtained polyamide was mixed with 0.45 g of calcium stearate and supplied to a twin-screw extruder (Laboplast Mill 2D25S, manufactured by Toyo Seiki Seisakusho) equipped with a coat hanger type T die. 26
The mixture was melt-kneaded at 0 ° C. and extruded onto a cooling roll controlled at about 45 ° C. to produce an unstretched film having a thickness of 120 μm. The unstretched film was stored in an aluminum bag at 0 ° C. or lower so as not to absorb moisture until the stretchability was evaluated. A sample having a length of 92 mm and a width of 92 mm cut out from the unstretched film was attached to a biaxial stretching machine BX-703 (manufactured by Iwamoto Seisakusho), and the temperature was about 50 ° C, 60 ° C, and 70 ° C (stretching temperature), respectively. After preheating for 20 seconds, the film was stretched three times in the extrusion direction of the film at the same temperature at a deformation speed of 35 mm / sec, and then heat-set at 180 ° C. The total molecular plane orientation of the obtained stretched film was measured, and the results are shown in Table 1. A film of 92 mm length and 92 mm width cut from the unstretched film was attached to a biaxial stretching machine BOX-703 (manufactured by Iwamoto Seisakusho) at an ambient temperature of 60 ° C. and a deformation speed of 35 mm / sec. The film was subjected to primary stretching at a magnification of 0.0 times, and then subjected to secondary stretching at the same temperature and the same deformation rate as the primary stretching until the film was broken. The stretching ratio at the time of secondary stretching breaking was 4.3 times.

Example 2 A sample having a length of 92 mm and a width of 92 mm cut from the unstretched film having a thickness of 120 μm obtained in Example 1 was subjected to a biaxial stretching machine B.
IX-703 type (manufactured by Iwamoto Seisakusho), 50 ℃, 6
After preheating at an ambient temperature of 0 ° C. and 70 ° C. for about 20 seconds, the film was stretched three times in the extrusion direction of the film at the same temperature at a deformation speed of 140 mm / sec, and then heat-set at 180 ° C. Measure the degree of orientation of all molecular planes of the obtained stretched film,
The results are shown in Table 1. A film of 92 mm in length and 92 mm in width cut from the unstretched film was attached to a biaxial stretching machine BOX-703 (manufactured by Iwamoto Seisakusho).
The film was subjected to primary stretching at a magnification of 0, and then subjected to secondary stretching at the same temperature and the same deformation rate as the primary stretching until the film was broken. The stretching ratio at the time of secondary stretching breaking was 4.1 times.

Example 3 The amounts of ε-caprolactam, NBDA, adipic acid and distilled water charged were 2200 g, 26 g, and 24.6 g, respectively.
g and 113 g, except that the polyamide was obtained in the same manner as in Example 1. Ηr of this polyamide is 3.
It was 31. The orientation degree of all molecular planes of a stretched film obtained by performing the same method as in Example 1 from this polyamide was measured. The results are shown in Table 1. Using this unstretched film, the same procedure as in Example 1 was carried out.
Axial stretching was performed. The stretching ratio at the time of secondary stretching breaking was 3.5 times.

Example 4 A sample having a length of 92 mm and a width of 92 mm cut out from the unstretched film having a thickness of 120 μm obtained in Example 3 was subjected to a biaxial stretching machine B.
IX-703 type (manufactured by Iwamoto Seisakusho), preheated at ambient temperature of 50, 60, 70 ° C for 20 seconds,
The film was stretched three times in the extrusion direction of the film at a deformation speed of 140 mm / sec and heat-set at 180 ° C. The total molecular plane orientation of the obtained stretched film was measured, and the results are shown in Table 1.
In addition, using this unstretched film, the same method as in Example 1 was used, and biaxial stretching was sequentially performed. The stretching ratio at the time of secondary stretching breaking was 3.3 times.

Comparative Example 1 A polyamide (nylon 6) was obtained in the same manner as in Example 1 except that 2200 g of ε-caprolactam and 110 g of distilled water were charged and NBDA and adipic acid were not used. Ηr of this polyamide was 4.05. This polyamide was used in the same manner as in Example 1 to measure the total molecular plane orientation of the obtained stretched film. The results are shown in Table 1. In addition, using this unstretched film, the same method as in Example 1 was used, and biaxial stretching was sequentially performed. The stretching ratio at the time of secondary stretching breaking was 1.4 times.

Comparative Example 2 Hexamethylenediamine was used in place of NBDA, ε-caprolactam 2200 g, hexamethylenediamine 3
0.1 g, adipic acid 38.9 g and distilled water 119 g
Was carried out in the same manner as in Example 1 except that
A polyamide (copolymer of nylon 6 and 66) was obtained. Ηr of this polyamide was 3.50. The stretched film obtained from this polyamide in the same manner as in Example 1 was measured for the total molecular plane orientation. The results are shown in Table 1. In addition, using this unstretched film, the same method as in Example 1 was used, and biaxial stretching was sequentially performed. The stretching ratio at the time of secondary stretching breaking was 1.8 times.

[0036]

[Table 1]

Example 5 A polyamide obtained in the same manner as in Example 1 was extruded at a cylinder temperature of 280 ° C. using a CS-40-26N type melt extruder manufactured by Uniplus Corporation to obtain a monofilament having a diameter of 2 mm. Obtained. The monofilament was attached to a hand stretching machine, preheated in a heating furnace at an atmosphere temperature of 60 ° C. for 5 minutes, and then stretched at the same temperature at a deformation rate of 1 mm / sec. This operation was repeated five times.
It could be stretched up to 5 times.

Comparative Example 3 Using a polyamide obtained in the same manner as in Comparative Example 1, a monofilament having a diameter of 2 mm was extruded at a cylinder temperature of 280 ° C. using a CS-40-26N type melt extruder manufactured by Uniplus. Obtained. The monofilament was attached to a hand stretching machine, preheated in a heating furnace at an atmosphere temperature of 60 ° C. for 5 minutes, and then stretched at the same temperature at a deformation rate of 1 mm / sec. This operation was repeated five times. As a result, the film was broken at a stretch ratio of 3.3 to 4.6.

Example 6 2000 g of 6-aminocaproic acid, 25.8 g of NBDA and 2 parts of adipic acid were placed in a 5-liter pressure vessel equipped with a stirrer, thermometer, pressure gauge, pressure controller and polymer outlet.
After charging 4.4 g and 100 g of distilled water, pressurizing and releasing nitrogen were repeated several times, and the inside of the pressure vessel was replaced with nitrogen.
The temperature was raised to 0 ° C. The reaction was conducted at 270 ° C. for 6 hours with stirring while flowing nitrogen gas at 150 ml / min. Next, the stirring was stopped, and the polyamide in a molten state was withdrawn in a string form from the polymer outlet, cooled with water, and then pelletized to form a polymer.
0 g of pellets were obtained. The pellet was washed for 12 hours under flowing hot water at 95 ° C., and then dried in vacuum at 80 ° C. for 24 hours. Ηr of the obtained polyamide was 3.53.
An unstretched film was obtained from this polyamide in the same manner as in Example 1. This unstretched film was prepared in Example 1
The primary stretching and the secondary stretching were performed in the same manner as described above, and the stretching ratio at the time of secondary stretching breaking was measured. The stretching ratio at the time of secondary stretching breaking was 3.8 times.

[0040]

The polyamide synthesized from a lactam and / or a diamine containing an aminocarboxylic acid, a dicarboxylic acid and norbornanediamine, in particular, a polyamide in which 10 to 100 mol% of the diamine is norbornanediamine has excellent stretchability. It is suitable as a material for a polyamide film for sequential biaxial stretching.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29L 7:00 C08L 77:10 F term (Reference) 4F071 AA54 AA55 AF08 AF21 BB02 BB03 BB06 BB07 BB08 BB09 BC01 4F210 AA29 AG01 QA02 QA03 QC06 QG01 4J001 DA01 DB04 EA02 EA06 EA07 EA08 EA12 EA14 EA15 EA16 EA17 EB08 EB09 EB14 EB36 EB37 EB46 EC05 EC07 EC08 EC09 EC14 EC16 EC47 EC48 GA12 GA13 GA15 HA02 JA29 JA10 JA12 BB11

Claims (5)

[Claims] 1. A polyamide excellent in stretchability, comprising: a unit composed of a lactam and / or an aminocarboxylic acid; a unit composed of a dicarboxylic acid; and a unit composed of a diamine containing norbonanediamine. 2. The stretchable polyamide according to claim 1, wherein 10 to 100 mol% of the diamine is norbonanediamine. 3. Lactam and / or aminocarboxylic acid 50 to 99.8 mol%, dicarboxylic acid 0.1 to 25 m
ol%, and a polyamide comprising 0.1 to 25 mol% of a diamine, wherein 10 to 100 mol% of the diamine is norbonane dimethylamine. 4. A film, monofilament or fiber produced from the polyamide according to claim 1. 5. A successively biaxially stretched film produced from the polyamide according to claim 1.