JPH0324157A - Polyamide resin composition - Google Patents

Abstract

PURPOSE:To obtain a polyamide resin composition having excellent low- temperature impact resistance and good bending modulus by blending a polyamide resin comprising nylon 66 and nylon 6 with two specified modified olefin polymers. CONSTITUTION:A composition comprising 50-95wt.% polyamide resin (A) [comprising a polycondensate of hexamethylenediamine with adipic acid (nylon 66) and 5.0-90wt.% epsilon-caprolactam ring-opening polymer (nylon 6) having a relative viscosity (JIS K 6810) >=2.5, desirably >=2.8] and 1-99wt.% modified olefin polymer composition (B) is used as a low-temperature impact resistance polyamide resin composition. Component B is prepared by grafting an unsaturated carboxylic acid onto a multicomponent copolymer of an alpha,beta-ethylenically unsaturated carboxylic ester (0.1-50wt.%) and a dibasic unsaturated carboxylic acid (0.05-20wt.%) and an ethylene/3 c or higher alpha-olefin copolymer in the presence of a radical initiator.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a polyamide resin composition containing a polyamide resin having excellent impact resistance as a main component, and particularly to a polyamide resin composition having extremely excellent impact resistance at low temperatures and The object of the present invention is to provide a polyamide resin composition having good flexural modulus (rigidity).

[Conventional technology]

Due to its excellent physical and chemical properties, polyamide resin is widely used in many fields such as synthetic fibers, films, and various molding materials. In particular, in recent years, polyamide resin has been widely used as an engineering plastic in various electronic and electrical parts, automobile parts, mechanical parts, etc. by taking advantage of its properties such as abrasion resistance, heat resistance, mechanical properties, and electrical properties. It looks like this.

However, although polyamide resins have the above-mentioned good properties, they are inferior in impact resistance, especially when used as molded parts, and many methods have been proposed to improve these properties.

That is, a composition in which a polyamide resin is blended with an acrylic ester or methacrylic ester copolymer of an olefin and a tertiary alcohol (Japanese Patent Publication No. 4B-287)
91), compositions containing modified polyolefins grafted with unsaturated polycarboxylic acids or derivatives thereof (JP-A-50-98442, JP-A-52-151)
No. 348, No. 55-9661, No. 55-98
No. 62, No. 55-185952, No. 57-8
No. 296, No. 57-78453 and No. 57-
No. 200948 and U.S. Patent No. 3.484.40
No. 3, etc.), compositions containing copolymers of ethylene and unsaturated carboxylic acid alkyl esters, unsaturated carboxylic acids or their metal salts, unsaturated epoxides, etc. (JP-A No. 5
1-70254, 51-1013157, 51-125451, 51-1430
No. 01, No. 52-47051, No. 52-803
No. 52) and ethylene and α-olefin (compositions containing polymers and ethylene ionomer resins (JP-A No. 58-21850, No. 58-2)
No. 9854, etc.), the impact resistance, which is the drawback mentioned above, has been improved and is generally called impact resistant nylon, and some of these compositions are in practical use.

However, these impact-resistant nylons have recently been used under more severe conditions, creating a need for materials with even better performance in terms of impact resistance, as well as bending resistance. It is also required to have good elastic modulus (rigidity).

By the way, ethylene-α-olefin copolymers (ethylene-propylene copolymer rubber, ethylene-propylene-diene multicomponent copolymer rubber) grafted with maleic anhydride as an unsaturated carboxylic acid derivative improve the impact resistance of polyamide resins. However, on the other hand, it is generally well known that mechanical strength such as flexural modulus decreases significantly, so it is not necessarily satisfactory in terms of performance balance. .

Therefore, the market as a molding material is sometimes limited, and there is a demand for polyamides that have particularly high impact resistance at low temperatures and also have good elastic modulus.

Based on the above, the present inventors have discovered that polyamide resin has even better impact resistance than the above-mentioned compositions, and has an excellent flexural modulus, without impairing the excellent properties originally possessed by polyamide resin. As a result of various searches for obtaining a composition having the following properties, we found that when blending a modified olefin polymer obtained by treating an olefin polymer with an unsaturated carboxylic acid or a derivative thereof into a polyamide resin, Olefin-based multicomponent copolymers containing α,β-type ethylenically unsaturated carboxylic acid esters and dibasic unsaturated carboxylic acids or derivatives thereof as copolymerized monomers, copolymers of ethylene and α-olefin, and said olefin-based multicomponents We previously proposed the use of premixed mixtures of copolymers, copolymers of ethylene and α-olefins, and multicomponent olefin copolymers (Japanese Patent Application Laid-Open No. 62-24384G).
No. 63-191857, JP-A-1-3848
No. 9).

[Problem to be solved by the invention]

However, although the impact resistance of the present inventors, including the Tsutsumi proposal, is excellent at normal temperatures, the impact resistance at low temperatures is not necessarily satisfactory.

In light of the above, the present invention has achieved impact resistance and flexural modulus at room temperature that are almost equivalent to or even better than previously proposed inventions, without impairing the excellent properties inherent to polyamide resin, and in particular, The object of the present invention is to obtain a polyamide resin composition having significantly excellent impact resistance at low temperatures.

[Means and effects for solving the problems] According to the present invention, these problems are solved by a condensation polymer of hexamethylene diamine and adipic acid and an ε monocapsulactam having a relative viscosity of 2.6 or more. It is a composition consisting of a polyamide resin consisting of an open a-ffi polymer and at least two types of modified olefin polymer. The polymerization ratio is 0.1 to 50% by weight,
and an olefin-based multi-component copolymer in which the copolymerization ratio of dibasic unsaturated carboxylic acid or its derivative is 0.05 to 20% by weight, and (II) at least ethylene and an α-olefin having 3 or more carbon atoms. Both copolymers are obtained by treating them with an unsaturated carboxylic acid or a derivative thereof in the presence of a radical initiator, and the proportion of polyamide resin in the composition is 50 to 95% by weight. , the composition ratio of the ring-opened polymer of ε-caprolactam in the total polyamide resin is 5.0 to 95f.
fi% and the composition ratio of any modified olefin polymer in the total amount of modified olefin polymers is 1 to 99% by weight. The present invention will be explained in detail below.

(^) Polyamide resin The polyamide resin used in the present invention is a condensation polymer of hexamethylene diamine and adipic acid (nylon 6-
6, polyhexamethylene adipamide) and a ring-opened polymer of ε-caprolactam (nylon 6, polycapramide). Among these polyamide resins, the relative viscosity of the ring-opened polymer of ε-caprolactam (JIS KI38
LO (measured using 98% concentrated sulfuric acid) is 2.6 or more, preferably 2.8 or more. When the relative viscosity of ε-caprolactam is less than 2.6, low temperature (e.g. -3σ
℃), impact strength is low.

These polyamide resins are manufactured industrially and are used in a wide range of fields, and their manufacturing methods, types, various physical properties, and appearance methods can be found in the "Plastic Handbook" edited by Shunsuke Murahashi, Ryohei Oda, and Minoru Imoto. “ (Asakura Shoten, published in 1982), pages i521 to 548
It is well known by pages etc.

(B) Modified olefin polymer The modified olefin polymer used in the present invention contains α,β-ethylenically unsaturated carboxylic acid ester and dibasic unsaturated carboxylic acid or a derivative thereof as monomer units. Containing olefinic multi-component F: These are obtained by treating each of a polymer and an ethylene-based copolymer of ethylene and an α-olefin with an unsaturated carboxylic acid or a derivative thereof in the presence of a radical initiator.

(+) Olefin-based multi-component copolymer The olefin-based multi-component copolymer used to produce the modified olefin-based polymer of the present invention is at least one selected from the group consisting of acrylic acid alkyl ester and methacrylic acid alkyl ester. It is an olefin-based multi-component copolymer containing α,β-type ethylenically unsaturated carboxylic acid ester and dibasic unsaturated carboxylic acid or its derivative as monomer units.

The number of carbon atoms in the alkyl group of the α,β-ethylenically unsaturated carboxylic acid ester is usually 1 to 10 (preferably 1 to 8), and among this α,β-ethylenically unsaturated carboxylic ester, Representative examples of acrylic acid alkyl esters include methyl acrylate, ethyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate.

Furthermore, representative examples of alkyl methacrylates include methyl methacrylate, ethyl methacrylate, and butyl methacrylate. Among these α,β-ethylenically unsaturated carboxylic acid esters, methyl acrylate, ethyl acrylate, butyl acrylate, and methyl methacrylate are particularly preferred. Further, among dibasic unsaturated carboxylic acids or derivatives thereof, the dibasic unsaturated carboxylic acid usually has at most 40 carbon atoms,
It is preferably 35 or less. Representative examples of the dibasic unsaturated carboxylic acids include maleic acid, itaconic acid, 3,0
-Endomethylene-1,2,3,6-tetrahydrosis-phthalic acid (nadic acid) and fumaric acid. In addition, typical examples of derivatives of dibasic unsaturated carboxylic acids include acid anhydrides, esters,
Mention may be made of amide compounds and their metal (usually alkali metals and metals of Groups IIA and IIB of the Periodic Table, such as sodium, magnesium, calcium, zinc) salts. Preferred examples of these dibasic unsaturated carboxylic acids and derivatives thereof include maleic acid, maleic anhydride, nadic acid and nadic acid anhydride, with maleic anhydride being preferred from an economical standpoint.

Furthermore, the number of carbon atoms in the olefin is generally at most 12, and preferably 8 or less. Representative examples of desirable olefins include ethylene, propylene and butene-1, with ethylene being most preferred.

The copolymerization ratio of olefin in this multi-component copolymer is 30 to 9
It is 9.85% by weight, particularly preferably 40 to 98.5% by weight. Further, the copolymerization ratio of the α,β-type ethylenically unsaturated carboxylic acid ester is 0.1 to 50% by weight, and particularly preferably 1.0 to 50% by weight.

Further, the copolymerization ratio of the dibasic unsaturated carboxylic acid or its derivative is 0.05 to 20% by weight as a total amount thereof, and particularly preferably 0.5 to IO% by weight.

If the copolymerization ratio of α,β-type unsaturated carboxylic acid ester and dibasic unsaturated carboxylic acid or its derivative in this multi-component copolymer is less than the lower limit, the impact resistance of the resulting composition may not necessarily be satisfactory. It's not something you should do. On the other hand, if the upper limit is exceeded, the softening point of the multi-component copolymer will increase, fluidity will decrease, and it will not only become difficult to modify (process) the unsaturated carboxylic acid or its derivative as described below, but also It is also economically unfavorable.

Melt index of this multi-component copolymer (JISK72
10, measured under conditions 4, hereinafter referred to as "M.I.J." is usually 0.01-100g/10 minutes,
0.05 to 100 g/10 min is desirable, especially 0.05 to 100 g/10 min.
1-50. /10 minutes is suitable. M. 1. is 0.01
If a multi-component copolymer with a ratio of less than g/10 minutes is used, processability will be poor. On the other hand, if it exceeds 100 g/10 minutes, moldability is poor.

This multi-component copolymer is produced using a generally well-known radical high-pressure polymerization method, for example, each monomer is polymerized under high pressure (generally, 5
00~2.500kg/cd), high temperature (usually 120kg/cd)
It can be easily produced by a radical polymerization method using a chain transfer agent if necessary at a temperature of 260° C. to 260° C.

(2) Ethylene copolymer The ethylene copolymer used in the production of the modified olefin copolymer of the present invention is a copolymer of ethylene and an α-olefin having 3 or more carbon atoms. For example, using a Ziegler-Natta catalyst, especially a catalyst consisting of a vanadium compound such as vanadium oxytrichloride or vanadium tetrachloride and an organoaluminum compound, the ethylene content is preferably 50% or more and the α-olefin content is 50% or less, preferably is 75-95% ethylene and 25% α-olefin.
5% by copolymerization. Also,
A multicomponent copolymer obtained by further copolymerizing 5% or less of a third component described below at this molar ratio of ethylene and α-olefin can also be used.

The number of carbon atoms in α-olefin is usually 12 or less, and typical examples include propylene, butene-1, hexene-1
, decene-1 and 4-methylpentene-1, among which brobylene and butene-1 are preferred, with propylene being particularly preferred. Further, as the third component, 2 such as 1,4-pentadiene, 1,5-hexadiene and 3,3-dimethyl 1,5-hexadiene are used.
Linear or branched diolefins containing only one double bond at the end, straight or branched chains containing only one double bond at the end, such as 1,4-hexadiene and 6-methyl-1,5-heptadiene. diolefins or bicyclo(2.2,L) monoheptene-2 (norbornene) and its derivatives (e.g. ethylidene norbornene,
10.0 g/10 min, such as cyclic diene hydrocarbons such as methylene norbornene, vinyl norbornene),
0. Ol to 5.0 g/10 min is desirable, especially 0.0 g/10 min.
05 to 5.0 g/lO min is suitable.

(3) Unsaturated carboxylic acids or derivatives thereof Unsaturated carboxylic acids or derivatives thereof used to treat (modify) the aforementioned olefinic multi-components (polymers and ethylene copolymers) are monobasic unsaturated carboxylic acids or derivatives thereof. Examples include carboxylic acids, the dibasic unsaturated carboxylic acids, and metal salts, amides, imides, esters, and anhydrides of these unsaturated carboxylic acids.Among these, monobasic unsaturated carboxylic acids usually have a carbon number of At most 30 pieces,
In particular, it is preferably 25 or less. Representative examples of monobasic unsaturated carboxylic acids include acrylic acid, methacrylic acid and crotonic acid. In addition, typical examples of dibasic unsaturated carboxylic acids and their derivatives include maleic acid, fumaric acid, itaconic acid, and nadic acid as dibasic unsaturated carboxylic acids, and maleic anhydride as their anhydrides.
nadic anhydride and tetrahydrophthalic anhydride,
Its esters include monoethyl or diethyl maleate and glycidyl methacrylate, and its imide includes maleimide. Among these unsaturated carboxylic acids or derivatives thereof, dibasic unsaturated carboxylic acid anhydrides are preferred, and maleic anhydride is particularly preferred.

(4) Radical initiator Furthermore, the decomposition temperature of the radical initiator used for producing the modified olefin polymer of the present invention with a half-life of 1 minute is usually 100°C or higher, preferably 105°C or higher, Particularly preferred is a temperature of 120°C or higher. Representative examples of suitable radical initiators include dicumyl peroxide, penzoyl peroxide, di-tert-mono-butyl peroxide, 2,5-dimethyl-2,5-di(tertiary-monobutyl rubberoxy)hexane. , 2,5-dimethyl-
2,5 di(tert-monobutylpeoxy)hexane-3,
Examples include organic peroxides such as lauroyl peroxide and tertiary monobutyl peroxybenzoate.

(5) Usage ratio The usage ratio of the unsaturated carboxylic acid and its derivatives and the radical initiator to 100 parts by weight of each of the olefin-based multi-component copolymer and ethylene-based copolymer is usually as follows.

For unsaturated carboxylic acids and their derivatives, their total amount is 0. Ol~5. O m parts, 0.05
~3. Oil part is preferable, especially 1: 0.1 to 2.
0 parts by weight is preferred. The total amount of unsaturated carboxylic acids and their derivatives used is 0. If the amount is less than 1 part by weight, the adhesiveness of the resulting modified olefin polymer will be insufficient. On the other hand, 5. If the amount exceeds Offi parts, there is a risk that separation or crosslinking reactions may occur during production of the modified olefin polymer.

In addition, with a radical initiator, 0.001-t. o parts by weight, preferably from 0.005 to 1.0 parts by weight, especially from 0.005 to 0.5 parts by weight. When the proportion of the radical initiator used is less than 0.001 parts by weight, the modification effect is not sufficiently exhibited, not only does it require a GC process to complete the modification, but also unreacted substances are mixed. On the other hand, t. If the amount exceeds the amount of OU, excessive decomposition or crosslinking reaction may occur, which is undesirable.

(8) Production of modified olefin polymer The modified olefin multi-component copolymer and modified ethylene copolymer of the present invention can be produced by known means for producing this type of modified olefin polymer. .

A typical production method involves preparing the aforementioned olefin-based multi-component copolymer and ethylene-based copolymer in a solvent such as an aromatic hydrocarbon compound such as xylene or toluene, or an aliphatic hydrocarbon compound such as hexane or heptane. A method of manufacturing by heating and mixing an unsaturated carboxylic acid or its derivative and a radical initiator with each of these olefin-based multi-component copolymers and an ethylene-based copolymer. are mixed in advance under essentially non-reactive conditions, and the resulting mixture is melt-mixed using a mixer used in the field of general synthetic resins, such as a screw extruder, Banbury mixer, or kneader. There are two methods, but the latter is widely preferred in terms of operation and economy.

In the latter case, regarding the temperature conditions for modification, the deterioration of the olefin-based multi-component copolymer or ethylene-based copolymer, the decomposition of the unsaturated carboxylic acid or its derivative, the decomposition temperature of the organic peroxide, etc. It is selected as appropriate in consideration, but generally it is ioo~350℃, 150~
A temperature of 350°C is desirable, and a temperature of 150 to 300°C is particularly suitable.

The modified olefin polymer of the present invention is obtained by treating the above-mentioned olefin multi-component copolymer and ethylene polymer separately with an unsaturated carboxylic acid or a derivative thereof in the presence of a radical initiator. The polymers may be mixed in advance or during the production of the composition of the present invention by the method described below. Alternatively, it may be produced by treating a mixture of an olefin-based multi-component copolymer and an ethylene-based copolymer with an unsaturated carboxylic acid or a derivative thereof in the presence of a radical initiator.

(C) Composition ratio The composition ratio of the polyamide resin in the composition of the present invention is 50 to 95% by weight with their total amount = 1 and 17 (that is, the composition ratio of the modified olefin polymer composition is (as the total amount of 50 to 5% by weight), and 55 to 5% by weight
95ffif: 1% is desirable, especially 60 to 90% by weight
is suitable. If the composition ratio of the polyamide resin in the composite is less than 50% by weight, the mechanical strength of the resulting composite will be significantly reduced, which is undesirable. On the other hand, if it exceeds 95% by weight, the effect of improving impact resistance is poor.

In addition, the composition ratio of the ring-opening polymer of ε-capsulactam in the total polyamide resin pile is 5. O~90% by weight, 10~
80% by weight is preferred, particularly 15-75% by weight. If the composition ratio of the ring-opened polymer of ε-1 cabbage lactam in the total polyamide resin is less than 5.0% by weight, the resulting composition cannot be said to have sufficient impact resistance at low temperatures. On the other hand, if it exceeds 90% by weight, other mechanical properties of the composition are poor.

Furthermore, the composition ratio of any modified olefin polymer in the total amount of modified olefin polymers is 1 to 99%.
% by weight, preferably from 5 to 95% by weight, especially 5% by weight.
~90% floc weight is suitable. If the composition ratio of any of the modified olefin polymers in the total amount of modified olefin polymers is less than 1% by weight, it is difficult to obtain a uniform silk composition, and the resulting composition has poor rigidity (bending resistance). elastic modulus) is insufficient. On the other hand, if it exceeds 99%, the impact resistance of the resulting composite cannot be said to be satisfactory.

(D) Molding method of composition, molding method, etc. In manufacturing the composition of the present invention, each component may be mixed simultaneously when manufacturing the composition, or some of the components may be mixed in advance, All the composition components may be mixed so as to finally achieve the above-mentioned composition ratio. Furthermore, the all-polyamide resin and the all-modified olefin polymer may be mixed separately, and the resulting mixtures may be mixed to have the above-mentioned composition ratios.

In producing the composition of the present invention, methods commonly used in the field of synthetic resins may be employed. The mixing method is a method in which a resin slurry is dry-blended using a mixer such as a Henschel mixer, tumbler, or ribbon blender, and then kneaded in a molten state using a kneader such as a screw extruder, kneader, or Banbury mixer. There is a method in which a screw extruder equipped with at least two quantitative feeders is used, and the extruder is used to knead the polyamide resin from one feeder and the modified olefin polymer from the other feeder, respectively. can give. Note that a more uniform composition can be obtained by performing these mixing methods two or more times.

When manufacturing the composition of the present invention or each of the above-mentioned mixtures, it is generally used in the field of olefinic polymers and polyamide resins to the extent that the performance of the composition of the present invention is not essentially impaired. Oxygen, heat and light (ultraviolet) stabilizers, flame retardants, lubricants, plasticizers,
Additives such as antistatic agents, reinforcing agents, colorants (pigments, etc.) and other additives may also be added (blended).

The polyamide resin and modified olefin polymer composition to be blended are melted when producing this composition by melt mixing and during the molding described below, but the process must be carried out within a temperature range where these do not deteriorate due to heat. . For these reasons, the temperature is generally 150 to 350°C, particularly preferably 200 to 320°C.

The composition of the present invention can be produced into molded articles having various shapes by molding methods such as extrusion molding, injection molding, and press molding, which are commonly practiced in the field of thermoplastic resins.

[Examples and comparative examples]

Hereinafter, the present invention will be explained in more detail with reference to Examples.

In addition, in Examples and Comparative Examples, Izod impact strength is 1/8 inch x 1/8 inch according to STM D-638.
Notch a 1/2 inch x 2.5 inch specimen;
Measurements were taken at temperatures of 23°C and -80°C. Further, the bending strength was determined by dpj using a rectangular test piece of 1/4 inch x 1/2 inch x 5 inches according to ASTM D-790.

In the Examples and Comparative Examples, the modified olefin polymer used was prepared in advance as described below.

100 parts by weight of an ethylene-methyl methacrylate-maleic anhydride terpolymer having a copolymerization ratio of methyl methacrylate of 7.8 parts by weight (hereinafter referred to as "polymer (l)"), 0.011 parts by weight of 2. 5-dimethyl-2,5-di(
tertiary-butyl-peroxy)hexane and 0.37
5 parts by weight of maleic anhydride was added to a Henschel mixer and dry blended for 5 minutes.

The obtained mixture was fed to a non-vent type extruder (diameter 400111) equipped with a full-flight screw, and
A crosstalk reaction is carried out while melting in a temperature range of 20 to 240°C to produce a modified olefin polymer [hereinafter referred to as "modified polymer"].
A) was produced. Obtained modified polymer (A)
When measured by infrared absorption spectroscopy, the amount of reacted maleic anhydride was 0.34% by weight.

minute, and the degree of crystallinity measured by X-ray diffraction method is 0.8
The modified polymer (A) was
Dry blending and crosstalk reaction are carried out in the same manner as in the production of modified olefin polymer [hereinafter referred to as "modified polymer"].
B) was produced.

The amount of reacted maleic anhydride in the obtained modified polymer (B) was 0.33fffffi%.

The modified polymer (^) and modified polymer (B) thus obtained were uniformly dry-blended for 30 minutes using a tumbler in the proportions shown in Table 1, and each mixture was was manufactured. Each mixture thus obtained was heated for 21 hours using a non-vent type extruder (diameter 40+a+s) equipped with a Dalmage type screw.
The mixture was melted and kneaded at a temperature of 0° C. to produce pellet-shaped edible olefin polymer compositions (abbreviations shown in Table 1).

In addition, as polyamide resins, a condensation polymer of hexamethylene diamine and adipic acid with a relative viscosity of 2.7 [hereinafter referred to as rPA(1)] and an open ε-capsulactam with a relative viscosity of 3.0 are used. Ring polymer [rPA (II)
) J] or a ring-opened polymer of ε-1-cubic lactam with a relative viscosity of 2.4 [hereinafter referred to as "PA (m) J]"
A mixture obtained by dry blending the following for 5 minutes using a Henschel mixer with the mixing member shown in Table 2 was used.

(Left blank below) Examples 1 to 9, Comparative Examples 1 to 7 Used to produce the modified olefin polymer composition, modified olefin copolymer, or each modified olefin polymer obtained as described above Polymer (1) or polymer (2) J (hereinafter referred to as "composition component (I)") and polyamide resin [hereinafter referred to as "composition component (■)"]
were dry blended in advance using a tumbler at the mixing ratios shown in Table 3. Each of the obtained mixtures was melted and kneaded at a temperature of 280° C. using a twin-screw extruder (diameter: 30° C.) to produce pellet-shaped polyamide resin compositions.

Using an injection molding machine, test pieces for performance evaluation were prepared from each of the polyamide resin compositions obtained in this way, and the Izod impact strength (23°C, -30°C) and flexural modulus were measured. I did it. The results are shown in Table 3.

(The following is a blank space) [Effects of the Invention] The polyamide resin composition of the present invention has good impact resistance at room temperature, and has extremely excellent impact resistance even under severe conditions such as -30°C.

Furthermore, the rigidity (flexural modulus) is also good. Therefore, it is clear that the polyamide resin composition of the present invention is promising in the fields of automobile parts, electrical equipment parts, electronic equipment parts, and other industrial parts.

Claims (1)

[Claims] A composition comprising a polyamide resin comprising a condensation polymer of hexamethylene diamine and adipic acid and a ring-opening polymer of ε-caprolactam having a relative viscosity of 2.6 or more, and at least two modified olefin polymers, The modified olefin polymer composition (I) has a copolymerization ratio of a and β-ethylenically unsaturated carboxylic acid ester of 0.
1 to 50% by weight, and the copolymerization ratio of the dibasic unsaturated carboxylic acid or its derivative is 0.05 to 20% by weight.
and (II) a copolymer of at least ethylene and an a-olefin having 3 or more carbon atoms, both of which are treated with an unsaturated carboxylic acid or a derivative thereof in the presence of a radical initiator. The composition ratio of the polyamide resin in the composition is 50 to 95% by weight, and the composition ratio of the ring-opened polymer of ε-caprolactam in the total polyamide resin is 5.0 to 90% by weight. % by weight, and the composition ratio of any modified olefin polymer in the total amount of the modified olefin polymer is 1 to 99% by weight.