JPH09328609A - Polyamide resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyamide resin composition extremely excellent in oil resistance and thermal stability, by blending a polyamide resin with a polycarbodiimide. SOLUTION: This composition comprises (A) 45-99.99wt.% of a polyamide resin, (B) 0.01-40wt.% of a polycarbodiimide and (C) 0-50wt.% of a bromine- containing polystyrene. Preferably, the component C has 1×10<4> to 15×10<4> number-average molecular weight (Mn) and <=5 weight-average molecular weight (Mw)/Mn. Preferably, 100 pts.wt. of the total of the component A to the component C is mixed with 1-200 pts.wt. of a filler. Consequently, a polyamide resin can be developed in uses in a wide range.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a polyamide resin composition having excellent oil resistance and thermal stability.

[0002]

Polyamide is an acid amide (--CONH).
It is a known resin as a general term for polymers having-) in the repeating unit and is known to have excellent properties as an engineering plastic. The polymerization method is ring-opening polymerization of lactam, aminocarboxylic acid. Polycondensation of acid,
It can be classified into three types of polycondensation of diamine and dibasic acid. Generally, polyamide is tough, has excellent mechanical properties such as strength, impact resistance, and abrasion resistance, has high heat resistance, chemical resistance, and oil resistance, and has good molding processability. It is used in various applications such as automobile parts, electric and electronic parts, and mechanical parts. Polyester typified by polyethylene terephthalate and polybutylene terephthalate has excellent mechanical properties and electrical properties and is a resin widely used as fibers, films and the like.

The terminal groups of polyamide are mainly carboxyl group (--COOH) and amino group (--NH ₂ ),
By adding a compound having a high reactivity with either or both of them, it is possible to achieve the capping of the terminal group of the polyamide and the increase in the molecular weight. Examples of adding and compounding a reactive compound to polyamide and reacting them in an extruder include an example using a phenol resin (JP-A-62-230846) and an example using bisoxazoline (JP-A-63-63). 24
3160), an example using N-acyl lactam (JP-A-3-62826), an example using polyglutarimide (JP-A-4-142368, JP-A 5-1).
No. 25278). However,
Generally, polyamide is processed at a high temperature of 200 to 350 ° C., so it is difficult to control the reaction in the extruder. At the same time, even if the reaction is successful and the polyamide has a high molecular weight and high viscosity, the oil resistance is high. It was inferior to polyamide itself in terms of properties and heat stability. Therefore, there has been a long-felt demand for a reactive compound in which the reaction is relatively gradual and easy to control even at high temperatures, and which does not impair the excellent oil resistance and thermal stability of polyamide. From the viewpoint of the oil resistance and heat stability of the polyamide resin composition, the heat resistance of the reactive compound to be added and the compatibility with the polyamide are important, and the reactivity of the terminal group of the polyamide with the carbomyl group is particularly important. Needed to be high.

In general, polyamide is a material that does not burn easily due to the nitrogen of the amide group due to its chemical structure.
635 test is self-extinguishing
Enters the category of. However, recently, for the purpose of improving the safety of products used in general households, such as household appliances, electric devices, building materials, and automobile parts, there is a strong demand for flame retardancy, and strict regulations on flame retardancy. It has become to. For this reason, in each country, regulatory measures are taken according to national circumstances, and test methods are being established. In the United States, it is particularly strict. Underwriters Laboratory (Underwri
ters Laboratory (hereinafter abbreviated as UL) standard, a detailed test method is determined together with heat resistance, which contributes to the improvement of safety of electrical equipment and the like. With respect to the flame retardancy of synthetic resin compositions used in electric devices and the like, it is often required to pass the V-0 standard in a combustion test according to the UL-94 test method.
Examples of the method of flame retarding a resin include flame retardation by modifying the resin itself, mixing of a nonflammable substance, coating with a nonflammable substance and a flame retardant substance, addition of a flame retardant, etc. As a method of burning, a method of adding a flame retardant, specifically, a method of blending an organic halogen compound is known, as in many other synthetic resins. Generally, in the combustion process of resin, temperature rise due to heating, melting, deterioration / decomposition, vaporization /
Diffusion, ignition, and continuation of combustion, but elucidation of the combustion phenomenon and elucidation of the flame retardant mechanism are not necessarily sufficient because the way of manifesting the phenomenon differs depending on the individual polymer material. Due to its high processing temperature, conventional organic halogen compounds are insufficient in terms of maintaining the performance of polyamide, heat resistance, impact resistance, thermal stability, and dripping resistance during combustion, and improvements have been sought. .

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide a polyamide resin composition having extremely excellent oil resistance and heat stability as compared with the prior art.

[0006]

Means for Solving the Problems The present inventors have found that a polyamide resin composition having extremely excellent oil resistance and heat stability as compared with conventional ones can be obtained by adding a polycarbodiimide to a polyamide resin. Heading The present invention has been reached. That is, the present invention relates to (a) polyamide resin 4
5-99.99% by weight, (b) polycarbodiimide
The present invention provides a polyamide resin composition containing 0 to 40% by weight and (c) 0 to 50% by weight of bromine-containing polystyrene.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In a preferred embodiment of the present invention, (1) the component (c) has a number average molecular weight (Mn) of 1 ×
10 ⁴ to 15 × 10 ⁴ , and a weight average molecular weight (Mw) / Mn of 5 or less. (2) A polyamide resin composition containing 1 to 200 parts by weight of a filler with respect to 100 parts by weight of the total amount of the components (a), (b) and (c) is included.

The polyamide as the component (a) used in the present invention includes all resins having an amide bond in the unit structure, and includes, for example, lactams such as ε-caprolactam, ω-lauryllactam and ω-dodecaractam. Polyamide obtained by ring-opening polymerization, 6-aminocaproic acid, 1
1-aminoundecanoic acid, 12-aminoundecanoic acid, 1
Polyamides derived from amino acids such as 2-aminododecanoic acid and para-aminomethylbenzoic acid, ethylenediamide, tetramethylenediamine, hexamethylenediamine, undecamethylenediamine, dodecamethylenediamine, 2,2,4- / 2,4,4 -Trimethylhexamethylenediamine, 5-methylnonamethylenediamine, meta-xylylenediamine, para-xylylenediamine, 1,3-bis (aminomethyl) cyclohexane, 1,4-bis (aminomethyl) cyclohexane, 1-amino-3 -Aminomethyl-
3,5,5-Trimethylcyclohexane, bis (3-methyl
-4-aminocyclohexyl) methane, bis (4,4'-aminocyclohexyl) methane, 2,2-bis (4-aminocyclohexyl) propane, metaxylylenediamine,
Paraxylylenediamine 2,2-bis (aminoprosyl)
Aliphatic, alicyclic and aromatic diamines such as piperazine and aminoethylpiperazine and adipic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, 1,3- and 1,4-cyclohexanedicarboxylic acid, terephthalic acid,
Isophthalic acid, 2-chloroterephthalic acid, 2-methylterephthalic acid, 5-methylisophthalic acid, 5-sodium sulfoisophthalic acid, hexahydroterephthalic acid, hexahydroisophthalic acid, dimer acid, diglycolic acid, and other aliphatic compounds , Polyamides derived from alicyclic and aromatic dicarboxylic acids, and copolyamides thereof. Of these, polycaproamide (polyamide 6), polyhexamethylene adipamide (polyamide 6,6), polytetramethylene adipamide (polyamide 4,6), polyundecane amide (polyamide 1) are usually used.
1), polydodecanamide (polyamide 12), semi-aromatic polyamide, aromatic polyamide, and copolyamide having these as main components are useful. Among these, polycaproamide, polyhexamethylene adipamide, polytetramethylene adipamide, and semi-aromatic polyamides and aromatic polyamides are preferable from the viewpoint of physical property balance.

As the method for polymerizing the polyamide, known melt polymerization, solid phase polymerization and a combination thereof can be used. The degree of polymerization of polyamide is not particularly limited,
Dissolve 1 g of polymer in 100 ml of 96% concentrated sulfuric acid (1 g / d
l) and the relative viscosity measured at 25 ° C. using a viscosity tube is
A polyamide in the range of preferably 1.5 to 6, and more preferably 2 to 5, can be arbitrarily selected according to the purpose, and two or more of the above polyamides can be mixed and used in combination. The blending amount of the component (a) polyamide in the present invention is 45 to 99.99% by weight, preferably 50 to
It is 99.97% by weight, more preferably 55 to 99.95% by weight. If the content of the component (a) is less than 45% by weight, the extrusion processability is poor, and the content of the component (a) is 99.9.
If it exceeds 9% by weight, as a result, the blending amount of the component (b) is too small and sufficient oil resistance and heat stability cannot be obtained.

The polycarbodiimide as the component (b) of the present invention is a polycarbodiimide mainly having a repeating unit represented by the general formula -N = C = NR- (wherein R represents a divalent organic group). It is united. As the synthetic method, for example, diphenylmethane-4,4′-
A method of reacting diisocyanate and phenylisocyanate in cyclohexane in the presence of 1-phenyl-3-methyl-2-phospholen-1-oxide (Japanese Patent Laid-Open Publication No. HEI-8)
-81545), dicyclohexylmethane-4,
4'-diisocyanate was added to 1-phenyl-3-methyl-
A method in which the reaction is performed in the presence of 2-phospholen-1-oxide (also, JP-A No. 8-81545) can be used. The polycarbodiimide of the present invention includes a modified polycarbodiimide grafted with one or more compounds having a graft reactive group and a carboxylic acid anhydride group, and a polycarbodiimide further containing an epoxy compound in addition to the above modification. Further, it may be a mixture of two or more kinds of polycarbodiimide, modified polycarbodiimide and epoxy compound, but when the amount of polycarbodiimide in the mixture or the total amount of polycarbodiimide and modified polycarbodiimide is 50% or more. Preferably there is.
At the same time, for the purpose of further improving oil resistance and thermal stability,
It is also preferable to add one or more of a copper compound, an amine compound, a hindered phenol compound, etc., if necessary, and the addition amount thereof is preferably 0.01 to 0.2% by weight. The blending amount of the component (b) polycarbodiimide in the present invention is 0.01 to 10% by weight, preferably 0.03.
-8% by weight, more preferably 0.05-5% by weight. When the blending amount of the component (b) is less than 0.01% by weight, thermal stability and oil resistance are poor, and when the blending amount of the component (a) exceeds 10% by weight, extrusion processability is deteriorated.

The bromine-containing polystyrene of the component (c) of the present invention is brominated polystyrene, polybrominated styrene, or a mixture of brominated polystyrene and polybrominated styrene. Brominated polystyrene is a product of brominated polystyrene afterwards, and the number of bromine bonded to the benzene ring of polystyrene in place of hydrogen is 1 to 5
And preferably 2-3. Polybrominated styrene is
One type of brominated styrene monomer such as monobrominated styrene, dibrominated styrene, tribrominated styrene, or 2
It is a polybrominated styrene obtained by polymerizing more than one kind, and preferably having a dibrominated styrene unit of 50% by weight or more, and more preferably 55% by weight or more. The polybrominated styrene of the present invention may, of course, be a polymer mainly of dibrominated styrene monomer, but a copolymer of dibrominated styrene monomer and tribrominated styrene monomer also has a bromine content. It is preferable in that it goes up. The bromine content in the brominated polystyrene and polybrominated styrene of the present invention is preferably 40 to 75% by weight, more preferably 5
0 to 75% by weight.

Further, when copolymerizing the styrene monomer and the brominated styrene monomer, other copolymerizable monomers may be used, if necessary. Examples of the copolymerizable monomer include olefin and vinyl, and may include a functional group. Examples of the olefin and vinyl include ethylene, propylene, butadiene, butene, hexene, pentene, methylebutene, methylpentene, styrene, acrylonitrile, vinyl chloride, vinyl acetate and the like, ethylene, propylene, butadiene, styrene,
Acrylonitrile is preferred. Examples of the functional group that the copolymerizable monomer may contain include one or more functional groups selected from a carboxyl group, an acid anhydride group, an oxazoline group, and an epoxy group. Specific examples thereof include acrylic acid, methacrylic acid, maleic acid, maleic anhydride, itaconic anhydride, vinyl oxazoline, glycidyl methacrylate and allyl glycidyl ether. Alternatively, the above-mentioned functional group may be copolymerized with styrene or brominated styrene, or the terminal of brominated polystyrene or polybrominated styrene may be modified.

The number average molecular weight (Mn) and the weight average molecular weight (Mw) of brominated polystyrene and polybrominated styrene are determined by gel permeation chromatography (GPC) using tetrahydrofuran (THF).
Is used as a solvent, the flame retardant is dissolved in a concentration of 1 mg / ml, the flow rate is 1.0 ml / min, and the temperature is 36 to 40 ° C.
n) and weight average molecular weight (Mw) can be obtained. The number average molecular weight (M
n) is preferably 0.5 × 10 ⁴ to 15 × 10 ⁴ , more preferably 0.7 × 10 ^{4 to} 13 × 10 ⁴ , further preferably 0/8 × 10 ⁴ to 10 × 10 ⁴ , particularly preferably Is 1 ×
It is 10 ^{4 to} 9 × 10 ⁴ . On the other hand, the ratio (Mw) / Mn of the weight average molecular weight and the number average molecular weight is preferably 1 to 5,
More preferably, it is 1.2 to 4.5. When a bromine-containing polystyrene having a number average molecular weight (Mn) and Mw / Mn within the above ranges is used, a resin composition having excellent properties such as oil resistance and thermal stability can be obtained. Among the bromine-containing polystyrene of the present invention, from the viewpoint of thermal stability at high temperature,
More preferred is polybrominated styrene.

By using the above-mentioned bromine-containing polystyrene, the heat resistance, impact resistance, and
Although the thermal stability is improved as compared with the conventional one, the dripping resistance at the time of combustion is significantly improved by the combined use effect with the component (b) polycarbodiimide of the present invention.
The blending amount of the bromine-containing polystyrene as the component (c) of the present invention is 0 to 50% by weight, preferably 0 to 40% by weight, more preferably 0 to 35% by weight. If the content of the component (c) exceeds 50% by weight, the extrusion processability will deteriorate. When flame retardancy is particularly required, the content of the bromine-containing polystyrene as the component (c) of the present invention is 1 to 50% by weight, preferably 2 to 40% by weight, more preferably 5 to 35% by weight.
It is.

In the polyamide resin composition of the present invention, a composition in which a filler is added as the component (d) to the above components (a), (b) and (c) is preferably used.
By using the component (d), a polyamide resin composition having improved rigidity and dimensional stability can be obtained. The component (d) of the present invention is various fillers having fibrous, powdery, granular, plate-like, needle-like, cloth-like and mat-like shapes, and typical examples thereof include glass fiber, asbestos fiber, Carbon fiber, graphite fiber, aramid fiber, nylon fiber,
Polyester fiber, calcium carbonate, talc, catalbot, wollastonite, silica, alumina, silica-alumina, diatomaceous earth, clay, calcined clay, kaolin, mica (fine mica), granular glass, glass flakes, glass balloons (hollow) Glass), gypsum, phenolic resin,
Fluorine-based resins, various thermosetting resins, red iron oxide, metal fibers, titanium dioxide, potassium titanate whisker, aluminum borate whisker, and other synthetic and natural mineral whiskers, magnesium oxide, calcium silicate, asbestos, sodium aluminate. , Calcium aluminate,
Examples thereof include aluminum, aluminum oxide, aluminum hydroxide, copper, stainless steel, zinc oxide, and metal whiskers. For the purposes of the present invention, glass fiber,
Carbon fiber, kaolin, mica, talc, various whiskers
Are preferred, and glass fibers, kaolin, and talc are particularly preferred because of their economical efficiency. They may have been subjected to a surface treatment as long as they do not impair the moldability and physical properties of the present invention, in particular aminosilane, acrylsilane,
Those subjected to surface treatment with a compound represented by vinyl, urethane, acrylic urethane and the like are preferable.

The addition amount of the (d) filler in the present invention is
It is 1 to 200 parts by weight, preferably 2 to 160 parts by weight, more preferably 3 to 120 parts by weight based on 100 parts by weight of the total amount of the components (a), (b) and (c) of the present invention.
Parts by weight. If the amount of filler added is less than 1 part by weight (d)
The purpose of adding the components is not achieved, and on the other hand, if the amount exceeds 200 parts by weight, processability, particularly extrusion moldability and injection moldability deteriorates, which is not preferable.

If necessary, a flame retardant aid may be added to the polyamide resin composition of the present invention in order to further enhance the flame retardancy. Examples of the flame retardant aid include antimony trioxide, antimony pentoxide, antimony compounds such as triphenylantimony, phosphoric acid ester, and the like. Among them, preferred are antimony trioxide and antimony pentoxide. . The addition amount of the flame retardant aid is preferably 1 to 20 parts by weight, more preferably 1 to 10 parts by weight, based on 100 parts by weight of the total of the components (a), (b) and (c). If it is less than 1 part by weight, the purpose of addition is not achieved, and if it exceeds 20 parts by weight, the mechanical strength and the like are lowered, which is not preferable.

The polyamide resin composition of the present invention contains other components such as pigments, dyes, colorants, refractory agents, copper, etc., as long as the moldability and characteristics are not impaired, depending on the performance required for the application. Stabilizers represented by compounds, amine compounds and hindered phenol compounds, anti-dripping agents during combustion represented by modified polyolefins and fluoropolymers, antioxidants, photoprotective agents, weathering agents , Light stabilizer, crystal nucleating agent, lubricant, release agent, plasticizer, antistatic agent,
Other polymers can be added and introduced. here,
Other polymers include, for example, polyptadiene (P
B), polyethylene (PE), ethylene-propylene copolymer (EP and EPDM), butadiene-styrene copolymer, styrene-ethylene-butene-styrene copolymer (SEBS), allyl rubber (AR), fluororubber (FR) ), Acrylonitrile-butadiene-styrene copolymer (ABS), acrylonitrile-ethylene propylene-styrene copolymer (AES), acrylonitrile-styrene copolymer (AS), polystyrene (PS), polyethylene terephthalate (PET) , Polybutylene terephthalate (PBT), polyester mixture, polycarbonate
Bonnet (PC), polysulfone, polyethersulfone (PES), polyimide (PI), polyphenylene sulfide (PPS), polyetheretherketone (P)
EEK), polytetrafluoroethylene (PTFE),
Examples thereof include polyoxymethylene (POM), polyphenylene ether (PPE), and modified products thereof, and the polyamide of the present invention is added as an addition amount that does not impair the moldability and characteristics of the polyamide resin composition of the present invention. It is also possible to appropriately mix less than 50 parts by weight with respect to 100 parts by weight of the resin composition.

For the polyamide resin composition of the present invention, the above-mentioned resin composition is used for a conventional thermoplastic resin such as known molding methods such as injection molding, extrusion molding, blow molding, vacuum molding and compression molding. It is possible to mold various molded products by subjecting the molded product to the molding.

The use of the polyamide resin composition of the present invention is not particularly limited. For example, various electric / electronic parts,
It can be particularly preferably used as a vehicle part, a machine part, an OA equipment part, a sundries, a heat resistant container, various casters, a filter, and the like.

[0021]

EXAMPLES AND COMPARATIVE EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto. The following materials were used in the examples and comparative examples. Component (a) a-1: Polyamide 6 resin (MC120 manufactured by Kanebo) a-2: Polyamide 6,6 resin (Amiran CM3 manufactured by Toray)
001) a-3: Polyamide 4,6 resin (Stony made by DSM
1, 96% sulfuric acid 1 g / dl relative viscosity 3.0) a-4: Polyamide 12 resin (M25 L25) a-5: Aromatic polyamide resin (Mitsui Petrochemical A-
Ren AE4200)

Component (b) b-1: Polydicarbodiimide (JP-A-8-81545)
B-2: Epoxy (Oilized Shell Epoxy Epicot 1
004K) b-3: 1,3-phenylenebisoxazoline b-4: polyglutarimide (EXL41 manufactured by Sumika Haas)
51; copolymer of methyl methacrylate and N-methyl-dimethyl-glutarimide)

Component (c) c-1: polybrominated styrene (bromine content 59% by weight,
Number average molecular weight Mn = 21,000, Mw / Mn = 1.8
6. Polymer of dibromostyrene) c-2: polybrominated styrene (bromine content 59% by weight,
Number average molecular weight Mn = 120,000, Mw / Mn = 3.3
0) c-3: polybrominated styrene (bromine content 67% by weight,
Number average molecular weight Mn = 30,000, Mw / Mn = 2.1
3, dibromostyrene: tribromostyrene = 2: 8 copolymer) c-4: modified polybrominated styrene (bromine content 60% by weight, number average molecular weight Mn = 52,000, Mw / Mn = 1.
92, a copolymer of maleic anhydride (2 wt%) and dibromostyrene) c-5: post-brominated polystyrene (bromine content 68% by weight, number average molecular weight Mn = 84,000, Mw / Mn = 2.
39) c-6: Polybrominated polystyrene (bromine content 59% by weight, number average molecular weight Mn = 160,000, Mw / Mn =
4.50) c-7: Post-brominated polystyrene (bromine content 58% by weight, number average molecular weight Mn = 32,000, Mw / Mn = 6.
12)

Component (d) d-1: Glass fiber (Made by Asahi Fiber-Glass, diameter about 1
Chopped strands having an average length of 3 mm and made of 0 μm continuous filament strands d-2: Kaolinite (Engelhard Co., average diameter 1)
~ 2 microns)

The resin composition samples of Examples and Comparative Examples are
A twin-screw extruder (Ikegai Tekko PCM45) was used to melt and knead into pellets. The obtained pellets were molded by an injection molding machine (PS40E made by NISSEI PLASTIC) to prepare predetermined test pieces. As the extrusion conditions and the injection molding conditions, the conditions recommended in the catalog of each polyamide manufacturer were used.

The performance of the samples described in Examples and Comparative Examples was measured by the following method. Oil resistance: Toyota Castle 75W-9 as oil
Samples molded into ASTM No. 1 dumbbells were immersed in oil of 150 ° C. using 0, and the tensile strength of the samples after 1000 hours was evaluated by the retention rate compared with the strength of the original sample. Thermal stability: Under the above injection molding conditions, the cooling time (residence time) is set to 10 seconds and 300 seconds, and the length is 12
A molded product having a width of 7 mm, a width of 12.7 mm and a thickness of 0.8 mm was molded, and the molded product having a cooling time of 300 seconds was visually evaluated for burn and discoloration (burn and discoloration; ○ = No, × = Yes). Extrudability: When the sample was prepared by the above extruder, the take-off property of the strand was visually judged (◯ = good, × = bad).

As examples and comparative examples, the compositions thereof and the evaluation results of the above items are shown in Tables 1 and 2.

[0028]

[Table 1]

[0029]

[Table 2]

Examples 1 to 9 Evaluations were made by the above-mentioned methods, and the results shown in Table 1 were obtained. From these results, the polyamide resin composition of the present invention, by blending the polycarbodiimide in the polyamide resin, flame retardant, and, including the case of adding a filler, oil resistance, polyamide resin excellent in thermal stability It turns out that it is a composition. Comparative Examples 1 to 9 The same evaluations as those of the examples were performed, and the results shown in Table 2 were obtained. In Comparative Example 1, the amount of the component (a) of the present invention was less than the claimed range, and extrusion processing could not be performed. Comparative Example 2
This was the case where the component (b) was not added, and the oil resistance and heat stability were clearly inferior to those of Example 1. In Comparative Example 3, the amount of the component (a) of the present invention was less than the claimed range and the amount of the component (c) exceeded the claimed range, and extrusion processing could not be performed. Comparative Example 4 and Comparative Example 5
In the case where the component (c) was out of the scope of claims of the present invention, the oil resistance and heat stability were inferior as compared with Examples 2 and 3. Comparative Example 6 is a case where the component (b) was not added, as in Comparative Example 2, and was clearly inferior in oil resistance and thermal stability as compared with Example 6. Comparative Example 7-
No. 9 is a case where a compound different from the component (b) of the present invention was added, and the oil resistance and thermal stability were obviously inferior to those of Example 1, and there was no difference when compared to Comparative Example 2. .

[0031]

EFFECTS OF THE INVENTION Conventional polyamide resins have excellent mechanical properties such as strength, impact resistance, and abrasion resistance, and have high heat resistance and chemical resistance. Although it is an engineering plastic with a high utility value, which is used for various purposes such as automobile parts, electric parts, and general mechanical parts, it still has insufficient performance in terms of oil resistance and thermal stability. In the present invention, by adding and blending polycarbodiimide into the polyamide resin, it is possible to provide a polyamide resin composition having extremely excellent oil resistance and thermal stability as compared with the conventional one. INDUSTRIAL APPLICABILITY According to the present invention, the polyamide resin can be applied to a wider range of applications and has an extremely high industrial value.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideetsu Fujiwara 2-11-24 Tsukiji, Chuo-ku, Tokyo Nihon Gosei Gomu Co., Ltd.

Claims (1)

[Claims] (A) Polyamide resin (a) 45-99.99
% By weight, (b) polycarbodiimide 0.01-40% by weight, and (c) bromine-containing polystyrene 0-50
A polyamide resin composition containing 100% by weight.