JP3273688B2 - polyamide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

This invention relates to novel polyamides. More specifically, the present invention relates to a polyamide having a specific intrinsic viscosity [η] and a terminal sealing rate, and having excellent hot water resistance, surface beauty, heat resistance, mechanical properties, low water absorption, chemical resistance, and the like. The polyamide of the present invention can be suitably used, for example, as a molding material for industrial materials, industrial materials, household goods, and the like.

[0002]

2. Description of the Related Art Conventionally, crystalline polyamides such as nylon 6 and nylon 66 have been widely used as fibers for clothing, industrial materials, or general-purpose engineering plastics because of their excellent properties and ease of melt molding. However, on the other hand, problems such as insufficient heat resistance and poor dimensional stability due to water absorption have been pointed out. In particular, in the electric and electronic fields requiring reflow soldering heat resistance due to the recent development of surface mount technology (SMT), or in the engine room parts of automobiles where the demand for heat resistance is increasing year by year, use of conventional polyamides Therefore, there is an increasing demand for polyamides having better heat resistance, dimensional stability, mechanical properties, and physicochemical properties.

[0003] In response to such a demand in the world, various semi-aromatic polyamides containing terephthalic acid and 1,6-hexanediamine as main components have been proposed, and some of them have been put to practical use. However, a polyamide composed of terephthalic acid and 1,6-hexanediamine (hereinafter, abbreviated as PA6-T) has a melting point near 370 ° C., which is higher than the decomposition temperature of the polymer, so that melt polymerization and melt molding are difficult. , Not practical. Therefore, in practice, 30 to 40 mol% of a dicarboxylic acid component such as adipic acid or isophthalic acid or an aliphatic polyamide such as nylon 6 is copolymerized to obtain a practically usable temperature range, that is, 2%.
At present, it is used in a composition whose melting point is lowered to about 80 to 320 ° C. Although copolymerization of such a large amount of the third component (or the fourth component in some cases) is certainly effective in lowering the melting point of the polymer, it is accompanied by a decrease in the crystallization speed and the ultimate crystallinity. As a result, not only physical properties such as rigidity at high temperature, chemical resistance and dimensional stability are reduced, but also productivity is reduced due to extension of the molding cycle. Also, fluctuations in various physical properties such as dimensional stability due to water absorption have been somewhat improved compared to conventional aliphatic polyamides due to the introduction of aromatic groups, but have reached the level of substantial problem solving. Not.

[0004] Japanese Patent Publication No. Sho 64-11073,
JP-A-2-36459, JP-B-1-19809,
Japanese Patent Application Laid-Open No. 3-281532 and the like mention that a longer-chain linear aliphatic diamine can be used as the diamine component of the semi-aromatic polyamide in addition to 1,6-hexanediamine. . However, these prior documents do not specifically disclose a polyamide using 1,9-nonanediamine, and furthermore, when 1,6-hexanediamine is used by using a diamine having 7 or more carbon atoms. There is no suggestion that particularly superior performance is exhibited as compared with.

[0005] GB 1 070 416 describes:
A nylon salt composed of terephthalic acid and 1,9-nonanediamine is polycondensed in the presence of 3.1 to 4.0 mol% of terephthalic acid with respect to diamine to thereby obtain an intrinsic viscosity (η).
inh) of 0.67 to 1.03 dl / g.

[0006]

According to the study of the present inventors, a polyamide having a terminal terephthalic acid residue obtained by a follow-up test of the method described in British Patent No. 1 070 416 can be obtained by melt molding. There is a problem that coloring or foaming tends to be observed, and the surface beauty of the molded product is insufficient and the hot water resistance is poor.

It is an object of the present invention to provide high crystallinity, heat resistance, low water absorption, chemical resistance, light weight, etc., as well as melt moldability, hot water resistance,
An object of the present invention is to provide a polyamide having excellent surface beauty.

[0008]

The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, a polyamide containing terephthalic acid and 1,9-nonanediamine as main components has high reactivity. It was found that a polyamide having excellent properties such as melt moldability, hot water resistance and surface aesthetics can be obtained only by controlling the intrinsic viscosity [η] and the terminal group sealing ratio within a specific range. Completed the invention.

According to the present invention, the object is to provide a dicarboxylic acid component in which 60 to 100 mol% of the dicarboxylic acid component is terephthalic acid and a 60 to 100 mol% of the diamine component.
Is a polyamide comprising a diamine component of 1,9-nonanediamine, having an intrinsic viscosity [η] of 0.6 to 2.0 dl / g measured at 30 ° C. in concentrated sulfuric acid, and 70 % of its terminal groups. The foregoing is accomplished by providing a sealed polyamide.

In the polyamide of the present invention, the intrinsic viscosity [η]
Is in the range of 0.6 to 2.0 dl / g, the intrinsic viscosity [η]
And the melt viscosity (MV) measured at a shear rate of 1000 s ⁻¹ , a relationship represented by the following equation (1) is established. logMV = 1.9 [η] + A (1) (where A is a number that changes with temperature)

In the case of the preferred polyamide of the present invention, 34
The A value at 0 ° C. is 0.6 to 1.0, and the A value at 330 ° C.
The difference between the value and the A value at 350 ° C. is 0.1-0.6.
On the other hand, in the case of the conventional PA6-T-based polyamide, the coefficient of intrinsic viscosity [η] is almost the same as the polyamide of the present invention, but the A value at 340 ° C. is 1.3 to 1.7,
The difference between the A value at 350C and the A value at 350C is 0.7 to 1.1.
It is. Thus, the preferable molding temperature is 330 to
At 350 ° C., the polyamides according to the invention are of the conventional PA6
Compared with -T type polyamide, even at the same intrinsic viscosity [η], the melt viscosity is small, and the change in melt viscosity with the change in molding temperature is small. Furthermore, the polyamide of the present invention also has the property that the change in melt viscosity during the residence time during molding is small, and the moldability is significantly improved as compared with the conventional PA6-T-based polyamide. I have.

Hereinafter, the present invention will be described specifically. As the dicarboxylic acid component used in the polyamide of the present invention,
The terephthalic acid component is at least 60 mol%, preferably at least 75 mol%, more preferably at least 90 mol%. If the terephthalic acid component is less than 60 mol%, the obtained polyamide is not preferable because various properties such as heat resistance and chemical resistance are reduced. Other dicarboxylic acid components other than the terephthalic acid component include malonic acid, dimethylmalonic acid, succinic acid, glutaric acid, adipic acid, 2-methyladipic acid, trimethyladipic acid, pimelic acid, 2,2
Aliphatic dicarboxylic acids such as dimethylglutaric acid, 3,3-diethylsuccinic acid, azelaic acid, sebacic acid, suberic acid; 1,3-cyclopentanedicarboxylic acid;
Alicyclic dicarboxylic acids such as 4-cyclohexanedicarboxylic acid; isophthalic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 1,4-phenylenedioxydiacetic acid; 1,3-phenylenedioxydiacetic acid, diphenic acid,
Aromatic dicarboxylic acids such as dibenzoic acid, 4,4′-oxydibenzoic acid, diphenylmethane-4,4′-dicarboxylic acid, diphenylsulfone-4,4′-dicarboxylic acid, 4,4′-biphenyldicarboxylic acid, or Any mixture of these can be mentioned. Of these, aromatic dicarboxylic acids are preferably used. Further, polycarboxylic acids such as trimellitic acid, trimesic acid, and pyromellitic acid can be used within a range in which melt molding is possible.

As the diamine component used in the polyamide of the present invention, the 1,9-nonanediamine component is at least 60 mol%, preferably at least 75 mol%, more preferably at least 90 mol%. As the diamine component, by using the above amount of 1,9-nonanediamine,
A polyamide having excellent heat resistance, moldability, chemical resistance, low absorption, light weight, and mechanical properties can be obtained. 1,9-
Other diamine components other than the nonanediamine component include:
Ethylenediamine, propylenediamine, 1,4-butanediamine, 1,6-hexanediamine, 1,8-octanediamine, 1,10-decanediamine, 1,12-
Dodecanediamine, 3-methyl-1,5-pentanediamine, 2,2,4-trimethyl-1,6-hexanediamine, 2,4,4-trimethyl-1,6-hexanediamine, 5-methyl-1, Aliphatic diamines such as 9-nonanediamine; alicyclic diamines such as cyclohexanediamine, methylcyclohexanediamine, isophoronediamine; p-phenylenediamine, m-phenylenediamine, xylenediamine, 4,4′-diaminodiphenylmethane, 4,4 ′ -Diaminodiphenyl sulfone, 4,
Aromatic diamines such as 4'-diaminodiphenyl ether, and any mixtures thereof can be mentioned.

In the polyamide of the present invention, 70% or more, preferably 80% or more, of the terminal groups of the molecular chain is more preferred.
Or 90% or more is sealed with a terminal sealing agent.
In determining the terminal capping rate, the number of carboxyl group terminals, amino group terminals and the number of terminals capped by the terminal capping agent present in the polyamide were measured, respectively.
The terminal sealing ratio can be determined by the following equation (2). The number of each terminal group is preferably determined from the integrated value of the characteristic signal corresponding to each terminal group by ¹ H-NMR from the viewpoint of accuracy and simplicity. If the characteristic signal of the terminal blocked by the terminal blocking agent cannot be identified, the intrinsic viscosity [η] of the polyamide is measured, and Mn = 19700 [η] -7900 (Mn represents a number average molecular weight) The total number of molecular chain terminal groups is calculated using the relationship of total number of terminal groups (eq / g) = 2 / Mn. further,
By titration, the number of carboxyl group terminals of the polyamide (eq
/ G) [0.1% solution of polyamide in benzyl alcohol
N with sodium hydroxide] and the number of amino group terminals (eq / g) [0.1
Titration with N hydrochloric acid], and the terminal sealing rate can be determined by the following equation (2).

Sealing ratio (%) = [(AB) ÷ A] × 100 (2) [wherein A is the total number of molecular chain terminal groups (this is usually twice the number of polyamide molecules) And B represents the total number of carboxyl and amino groups.

The terminal blocking agent is not particularly limited as long as it is a monofunctional compound having reactivity with the amino group or carboxyl group at the polyamide terminal, but from the viewpoints of reactivity and stability of the blocked terminal. , A monocarboxylic acid or a monoamine is preferred, and a monocarboxylic acid is more preferred from the viewpoint of easy handling. In addition, acid anhydrides such as phthalic anhydride, monoisocyanates, monoacid halides, monoesters, and monoalcohols can also be used.

The monocarboxylic acid used as the terminal blocking agent is not particularly limited as long as it has reactivity with an amino group. Examples thereof include acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, Aliphatic monocarboxylic acids such as caprylic acid, lauric acid, tridecylic acid, myristic acid, palmitic acid, stearic acid, pivalic acid, and isobutylic acid; alicyclic monocarboxylic acids such as cyclohexanecarboxylic acid; benzoic acid, toluic acid, α -Naphthalenecarboxylic acid, β-naphthalenecarboxylic acid, methylnaphthalenecarboxylic acid, aromatic monocarboxylic acids such as phenylacetic acid,
Alternatively, an arbitrary mixture thereof can be mentioned.
Among them, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, caprylic acid, lauric acid, tridecylic acid, myristic acid, palmitic acid, stearic acid, from the viewpoints of reactivity, sealing terminal stability, and price. And benzoic acid are particularly preferred.

The amino group terminal of the polyamide of the present invention is blocked with these monocarboxylic acids to form a blocked terminal represented by the following general formula (I).

[0019]

Embedded image (In the formula, R is a residue obtained by removing the carboxyl group from the above monocarboxylic acid, and is preferably an alkyl group, a cycloalkyl group, an aryl group, or an aralkyl group.)

The monoamine used as the terminal blocking agent is not particularly limited as long as it has reactivity with a carboxyl group. Examples thereof include methylamine, ethylamine, propylamine, butylamine, hexylamine and octylamine. Aliphatic monoamines such as decylamine, stearylamine, dimethylamine, diethylamine, dipropylamine and dibutylamine; cycloaliphatic monoamines such as cyclohexylamine and dicyclohexylamine; aniline, toluidine, diphenylamine,
An aromatic monoamine such as naphthylamine, or an arbitrary mixture thereof can be mentioned. Of these,
From the viewpoints of reactivity, boiling point, stability of the sealed terminal and price, butylamine, hexylamine, octylamine,
Decylamine, stearylamine, cyclohexylamine, aniline are particularly preferred.

The carboxyl group terminal of the polyamide of the present invention is blocked with these monoamines to form a blocked terminal represented by the following general formula (II).

[0022]

Embedded image (Wherein, R ¹ is a residue obtained by removing an amino group from the above monoamine, and is preferably an alkyl group, a cycloalkyl group, an aryl group, or an aralkyl group. R ² is a hydrogen atom or an amino group from the above monoamine. And preferably a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, or an aralkyl group.)

The amount of the terminal blocking agent used in the production of the polyamide of the present invention is such that the intrinsic viscosity [η] of the finally obtained polyamide and the blocking ratio of the terminal groups are within the range specified in the present invention. It is necessary to choose to be inside. The specific amount used varies depending on the reactivity of the terminal blocking agent used, the boiling point, the reaction apparatus, the reaction conditions, and the like, but is usually 0.5 to 10 mol% based on the total number of moles of the dicarboxylic acid and the diamine. Used within range.

The polyamide of the present invention is known as a method for producing a crystalline polyamide, except for the special consideration for controlling the intrinsic viscosity [η] and the terminal group sealing ratio within the ranges specified in the present invention. It can be manufactured using any of the methods described. According to the inventors' research, the end-capping agent and the catalyst were added all at once to the diamine and the dicarboxylic acid to produce the nylon salt and then once added.
A prepolymer having an intrinsic viscosity [η] of 0.1 to 0.6 dl / g at 30 ° C. in concentrated sulfuric acid at a temperature of 0 ° C. or less, and further subjected to solid phase polymerization or polymerization using a melt extruder Thereby, the polyamide of the present invention can be easily obtained. When the terminal blocking agent and the catalyst are added after the step of producing the nylon salt, problems such as a shift in the molar balance between the carboxyl group and the amino group during polymerization and the formation of a crosslinked structure are likely to occur. When the intrinsic viscosity [η] of the prepolymer is in the range of 0.1 to 0.6 dl / g, the shift in the molar balance between the carboxyl group and the amino group and the decrease in the polymerization rate in the post-polymerization stage are small, and A polyamide having a small molecular weight distribution and excellent in various properties and moldability can be obtained. When the final stage of the polymerization is carried out by solid-phase polymerization, it is preferably carried out under reduced pressure or under the flow of an inert gas.If the polymerization temperature is in the range of 180 to 280 ° C, the polymerization rate is large, and the productivity is excellent. It is preferable because coloring and gelation can be effectively suppressed. When the final stage of the polymerization is carried out by a melt extruder, the polymerization temperature is 37
When the temperature is 0 ° C. or lower, the polyamide is hardly decomposed and a polyamide without deterioration is obtained.

The polyamide of the present invention has an intrinsic viscosity [η] measured in concentrated sulfuric acid at 30 ° C. in the range of 0.6 to 2.0 dl / g, and in the range of 0.7 to 1.7 dl / g. Are preferable, and those in the range of 0.9 to 1.5 dl / g are more preferable.

Examples of the catalyst include phosphoric acid, phosphorous acid, hypophosphorous acid, and salts thereof, and esters thereof, specifically, potassium, sodium, magnesium,
Vanadium, calcium, zinc, cobalt, manganese,
Metal salts such as tin, tungsten, germanium, titanium and antimony, ammonium salts, ethyl ester, isopropyl ester, butyl ester, hexyl ester, isodecyl ester, octadecyl ester, decyl ester, stearyl ester, phenyl ester and the like can be mentioned. . In addition, as necessary, stabilizers such as copper compounds, coloring agents, ultraviolet absorbers, light stabilizers, antioxidants, antistatic agents, flame retardants, crystallization accelerators,
Glass fibers, plasticizers, lubricants and the like can be added during or after the polycondensation reaction.

Molding methods such as injection molding, blow molding, extrusion molding, compression molding, stretching, and vacuum molding can be applied to the polyamide of the present invention. As an engineering plastic, it can be molded not only into ordinary molded articles but also into films and fibers, and can be suitably used for industrial materials, industrial materials, household goods, and the like.

[0028]

EXAMPLES The present invention will now be described specifically with reference to examples, but the present invention is not limited by these examples. In Examples, the terminal sealing rate, intrinsic viscosity, intrinsic viscosity [η] after hot water treatment, retention of tensile strength after hot water treatment, retention of tensile elongation after hot water treatment, Tensile strength,
Tensile elongation, flexural strength, flexural modulus, heat deformation temperature, impact strength, high temperature modulus, equilibrium water absorption, melt viscosity, crystallization speed, specific gravity, and chemical resistance were measured by the following methods.

Terminal blocking ratio : ¹ H-NMR (500 MH
z, measured in deuterated trifluoroacetic acid at 50 ° C.), the number of carboxyl group ends, amino group ends and sealed ends was measured from the integrated value of the characteristic signal for each terminal group, and the above formula was used. The terminal blocking rate was determined from (2). The chemical shift values of typical signals used for measurement are shown below.

[0030]

[Table 1]

Intrinsic viscosity [η] : in concentrated sulfuric acid at 30 ° C.
The intrinsic viscosities (η inh) of the samples having concentrations of 0.05, 0.1, 0.2, and 0.4 g / dl were measured, and the extrapolated value to the concentration of 0 was defined as the intrinsic viscosity [η]. ηinh = [ln (t ₁ / t ₀ )] / c [wherein, ηinh represents an intrinsic viscosity (dl / g), t ₀ represents a solvent flow time (second), and t ₁ represents a sample solution flow. Represents time (seconds), and c is the concentration of the sample in the solution (g / dl)
Represents ]

Retention rate of intrinsic viscosity [η] after hot water treatment, pull
Tensile strength retention, tensile elongation retention : JIS No. 1 dumbbell-type injection-molded pieces were subjected to steam treatment in a pressure-resistant autoclave (120 ° C./2 atm / 120 hours), and the sample was vacuum-dried at 120 ° C. for 120 hours. . This treatment was repeated twice, and the intrinsic viscosity [η], the tensile strength and the tensile elongation of the sample after the first treatment and after the two treatments were measured, and the retention (%) with respect to the value before the treatment was determined. The tensile strength and tensile elongation were measured by the following methods.

Tensile strength, tensile elongation, bending strength, bending elasticity
Rate, heat deformation temperature, impact strength : A test piece in an absolutely dry state injection-molded at a temperature about 20 ° C. higher than the melting point was measured by the following method.

[0034]

[Table 2]

High temperature elastic modulus : The above flexural elastic modulus is 200 ° C.
And the value was taken as the high temperature elastic modulus.

Equilibrium water absorption : hot pressed at a temperature 20 ° C. higher than the melting point, cooled at 150 ° C. for 5 minutes, thickness about 2
A 00 μm film (5 cm × 5 cm) was dried under reduced pressure at 120 ° C. for 5 days, weighed, immersed in water at 23 ° C. for 10 days, weighed, and increased in weight to the weight before immersion ( %).

Melt viscosity and A value : 120 ° C. under reduced pressure
For 2 days using a flow tester (manufactured by Shimadzu Corporation) at a temperature range of 330 ° C. to 350 ° C.
The melt viscosity (MV) at a shear rate of 1000 s ^-1 was measured. A value was obtained from the relational expression between MV and intrinsic viscosity [η]: logMV = 1.9 [η] + A.

Crystallization rate : Measured using a differential scanning calorimeter (manufactured by Mettler, DSC-30). The sample in an absolutely dry state was melted at 350 ° C. under a nitrogen stream, and then cooled to 50 ° C. at a cooling rate of 10 ° C./min. The crystallization peak that appeared at that time was taken as the crystallization point (Tcc). Next, the temperature was raised at a rate of 10 ° C./min, and the melting point (Tm) was measured. The difference between the melting point and the crystallization point (Tm-Tcc) was taken as the crystallization rate.

Specific gravity : Measured using a density gradient tube.

Chemical resistance : A 200 μm-thick film hot-pressed at a temperature about 20 ° C. higher than the melting point and punched out with a JIS No. 3 dumbbell was used to cut sample pieces at 23 ° C. with various chemicals (methyl alcohol, 10% sulfuric acid, 50% The sample was immersed in a sodium hydroxide aqueous solution and a 50% calcium chloride aqueous solution for 7 days, and the retention (%) of the tensile strength of the sample before the treatment was measured.

Example 1 3272.9 g (19.70 mol) of terephthalic acid,
3165.8 g (20.0 mol) of 9-nonanediamine,
73.27 g (0.60 mol) of benzoic acid, 6.5 g of sodium hypophosphite monohydrate (0.1% by weight based on the raw material) and 6 liters of distilled water were placed in an autoclave having an internal volume of 20 liters. It was replaced with nitrogen. The mixture was stirred at 100 ° C for 30 minutes, and the internal temperature was raised to 210 ° C over 2 hours. At this time, the pressure in the autoclave was increased to 22 kg / cm ² . After continuing the reaction for 1 hour, the temperature was raised to 230 ° C., and thereafter, the temperature was maintained at 230 ° C. for 2 hours, and the reaction was performed while gradually removing water vapor and maintaining the pressure at 22 kg / cm ² . Next, the pressure was reduced to 10 kg / cm ² over 30 minutes, and the reaction was further performed for 1 hour.
5 dl / g of prepolymer was obtained. This is 100 ° C,
It was dried under reduced pressure for 12 hours and pulverized to a size of 2 mm or less. This was subjected to solid-state polymerization at 230 ° C. and 0.1 mmHg for 10 hours, and the melting point was 317 ° C. and the intrinsic viscosity [η] was 1.
A white polyamide having 35 dl / g and a terminal sealing rate of 90% was obtained. Next, this polyamide was injection-molded at a cylinder temperature of 340 ° C. and a mold temperature of 100 ° C., and various physical properties of the obtained molded product were measured. The results obtained are shown in Table 3 below.

Example 2 In Example 1, the amounts of terephthalic acid, 1,9-nonanediamine and benzoic acid were changed to terephthalic acid 32, respectively.
69.5 g (19.68 mol), 1,9-nonanediamine 3169.0 g (20.02 mol), benzoic acid 78.
A polyamide and a molded article thereof were produced by the method described in Example 1 except that the amount was 16 g (0.64 mol), and various physical properties were measured. The results obtained are shown in Table 3 below.

Example 3 In Example 1, octylamine was used in place of benzoic acid, and the amounts of terephthalic acid, 1,9-nonanediamine, octylamine and sodium hypophosphite were each changed to 3322.7 g (20%). 3.0 mol), 316.2 g (19.75 mol) of 1,9-nonanediamine, 64.63 g (0.50 mol) of octylamine, 13.0 g of sodium hypophosphite (0.2% by weight based on the raw material) ), Except that polyamide and a molded article thereof were produced by the method described in Example 1, and various physical properties were measured. The results obtained are shown in Table 3 below.

Comparative Example 1 Example 1 was repeated except that the amounts of terephthalic acid and benzoic acid were changed to 3322.7 g (20.0 mol) and 34.19 g (0.28 mol) of benzoic acid, respectively. A polyamide and a molded article thereof were produced by the method described in Example 1, and various physical properties were measured. The results obtained are shown in Table 3 below.

Comparative Example 2 Example 1 was repeated except that the amounts of terephthalic acid and benzoic acid were changed to 3355.9 g (20.2 mol) and 12.21 g (0.10 mol) of benzoic acid, respectively. A polyamide and a molded article thereof were produced by the method described in Example 1, and various physical properties were measured. The results obtained are shown in Table 3 below.

Comparative Example 3 The procedure of Example 1 was repeated, except that the amounts of terephthalic acid and benzoic acid were changed to 3073.5 g (18.5 mol) and 366.4 g (3.0 mol) of benzoic acid, respectively. A polyamide and a molded article thereof were produced by the method described in Example 1, and various physical properties were measured. The results obtained are shown in Table 3 below.

Comparative Example 4 The procedure of Example 1 was repeated, except that benzoic acid and sodium hypophosphite were not used, and the amount of terephthalic acid was 3372.5 g (20.
3 mol), and a polyamide and a molded article thereof were produced by the method described in Example 1, and various physical properties were measured. The results obtained are shown in Table 3 below.

[0048]

[Table 3]

Comparative Example 5 In Example 1, 2325.9 g of terephthalic acid (1
4.0 mol), 996.8 g (6.0 mol) of isophthalic acid, 2324.2 g (24.2 g) of 1,6-hexanediamine
0.0 mol), 24.43 g (0.20 mol) of benzoic acid
A polyamide and a molded product thereof were produced by the method described in Example 1, and various physical property values were measured. The obtained results are shown in Table 4 below together with the results of Example 1.

[0050]

[Table 4]

[0051]

Industrial Applicability The polyamide of the present invention is excellent in hot water resistance, surface aesthetics, heat resistance, mechanical properties, low water absorption, chemical resistance, etc., and is used as a molding material for industrial materials, industrial materials, household goods and the like. It can be suitably used.

(56) References JP-A-62-36459 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08G 69/00-69/36 EPAT (QUESTEL) CA ( STN) WPI (DIALOG)

Claims (1)

(57) [Claims] 1. 60 to 100 mol% of a dicarboxylic acid component
Is a polyamide comprising a dicarboxylic acid component of terephthalic acid and a diamine component of 60 to 100 mol% of the diamine component being 1,9-nonanediamine, and has an intrinsic viscosity [η] of 0 measured in concentrated sulfuric acid at 30 ° C. 0.6 to 2.0 dl
/ G and 70 % or more of its terminal groups are blocked.