JPH064754B2 - Resin composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to a resin composition useful as a constituent material for various automobile parts, mechanical parts, electric or electronic parts, and general sundries, and a molded product thereof.

[Prior Art] Thermoplastic polyesters represented by polyethylene terephthalate and polybutylene terephthalate have excellent mechanical properties, particularly high rigidity and strength, and are widely used as excellent engineering plastics. On the other hand, polyamides such as polycaproamide and polyhexamethylene adipamide are used as important materials in the field of molded articles having different uses from polyesters by taking advantage of their excellent toughness, abrasion resistance and chemical resistance.

Conventionally, it has been attempted to combine the above polyester and polyamide to utilize the excellent properties of each and to alleviate the problems of each. For example, JP-B-47-19101, JP-B-47-24465, and JP-A-48-56.
No. 742, JP-A-49-114661, JP-A-56-34754, JP-A-57-49657 and the like, the composition of the polyester and polyamide is changed according to the purpose, and additives are added. As a related art, there is disclosed a technique in which a problem when a polyester and a polyamide are combined is improved by using a fibrous reinforcing material and an inorganic filler together.

[Problems to be Solved by the Invention] When a polyester and a polyamide are mixed, usually,
Although the melt kneading method is applied, since the polyester and polyamide have poor compatibility, a uniform kneaded product cannot be obtained, and as a result, the mechanical properties of the molded product obtained from the kneaded product are low, There is a problem in that the mechanical properties vary greatly from molded body to molded body. Among these problems, polyesters and polyamides have the problems that, especially, the tensile elongation of the molded product is low and the thermal deformation temperature varies widely depending on the molded product, and further, the molded product may cause layer separation during use. It is hindered from applying the constituent materials of the combination of and to various fields.

The present invention eliminates such problems, the constituent components including polyester and polyamide can be kneaded so as to be uniform, the molded product obtained from the kneaded product does not vary,
An object is to provide a resin composition having excellent mechanical properties and a molded article thereof.

[Means and Actions for Solving Problems] As a result of studies to achieve the above object, the present inventors have found that a mixture of polyester and polyamide is further mixed with a specific grafted polyolefin. It was found that the obtained molded product had a dense and homogeneous structure and had excellent mechanical properties, and completed the present invention.

That is, the present invention relates to (a) polyamide 5 to 95% by weight.
And (b) 100 parts by weight of a mixture consisting of 95 to 5% by weight of thermoplastic polyester, and (c) a modified polyolefin having a functional group in the molecular chain, with an addition polymer having a peroxide bond in the molecular chain. A resin composition characterized by comprising 0.5 to 35 parts by weight of a grafted polyolefin modified product obtained by polymerization, wherein the thermoplastic polyester is dispersed as particles having an average particle size of 2 μm or less, and a molded product thereof. Regarding

The polyamide of the component (a) used in the present invention is not particularly limited and may be any polymer which is obtained from an amino acid, a lactam or a diamine and a dicarboxylic acid and which can be melt-polymerized and melt-molded. Good.

Among the monomers used as the raw material for producing the polyamide of the component (a), examples of amino acids include 6-aminocaproic acid, 11-aminoundecanoic acid, 12-aminododecanoic acid, and paraaminomethylbenzoic acid; lactams. Examples of the diamine include ε-caprolactam and ω-laurolactam; examples of the diamine include tetramethylenediamine, hexamethylenediamine, undecamethylenediamine, dodecamethylenediamine, 2,2,4- /. 2,4,4-trimethylhexamethylenediamine, 5-methylnonamethylenediamine, metaxylylenediamine, paraxylylenediamine, 1,3-bis (aminomethyl) cyclohexane, 1,3-bis (aminomethyl) cyclohexane, 1
-4-bis (aminomethyl) cyclohexane, 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane, bis (4-aminocyclohexyl) methane,
Examples thereof include bis (3-methyl-4-aminocyclohexyl) methane, 2,2-bis (4-aminocyclohexyl) propane, bis (aminopropyl) piperazine, and aminoethylpiperazine. Examples of the dicarboxylic acid include adipic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, terephthalic acid,
Examples thereof include isophthalic acid, 2-chloroterephthalic acid, 2-methylterephthalic acid, 5-methylisophthalic acid, 5-sodiumsulfoisophthalic acid, hexahydroterephthalic acid, hexahydroisophthalic acid and diglycolic acid.

Polyamides preferable as the component (a) of the present invention include, for example, polycaproamide (nylon 6), polyhexamethylene adipamide (nylon 6,6), polyhexemethylene sepacamide (nylon 6,10), polyundeca. Methylene adipamide (nylon 11,6), polyhexamethylene dodecamide (nylon 6,12), polyundecane amide (nylon 11), polydodecane amide (nylon 1)
2) and their copolyamides, mixed polyamides and the like.

The polyamide as the component (a) is preferably one in which the relative viscosity at 25 ° C. of a solution prepared by dissolving the polyamide in concentrated sulfuric acid to a concentration of 1% is in the range of 2.0 to 5.0.

The thermoplastic polyester as the component (b) used in the present invention is a polymer obtained by a condensation reaction in which a dicarboxylic acid or an ester-forming derivative thereof and a diol or an ester-forming derivative thereof are main components.

Examples of the dicarboxylic acid used here include terephthalic acid, isophthalic acid, orthophthalic acid, 2,6-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, bisbenzoic acid, bis (p-carboxyphenyl) methane,
Anthracene dicarboxylic acid, 4,4'-diphenyl ether dicarboxylic acid, 4,4'-diphenoxyethane dicarboxylic acid, adipic acid, sebacic acid, azelaic acid, dodecanenic acid, 1,3-cyclohexanedicarboxylic acid,
Mention may be made of 1,4-cyclohexanedicarboxylic acid or an ester-forming derivative thereof alone or in a mixture. As the diol component, ethylene glycol,
Propylene glycol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 1,
6-hexanediol, decamethylene glycol, cyclohexanedimethanol, cyclohexanediol, long-chain glucose having a molecular weight of 400 to 6,000, that is, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and mixtures thereof. You can

Examples of the thermoplastic polyester as the component (b) include, for example,
Polyethylene terephthalate, polyethylene naphthalate, polypropylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate, polycyclohexane dimethylene terephthalate, poly (ethylene terephthalate / ethylene isophthalate) copolymer, poly (butylene terephthalate / brylened decadioate) co Examples thereof include polymers, and particularly useful in the present invention are polyethylene terephthalate and polybutylene terephthalate.

The thermoplastic polyester as the component (b) is preferably one having a relative viscosity at 25 ° C. of 1.15 to 2.5 at 25 ° C., which is obtained by dissolving 0.5% of it in orthochlorophenol. Those of 0.3 to 2.1 are more preferable.

The grafted polyolefin modified product of the component (c) used in the present invention can be obtained by graft polymerizing an addition polymer having a peroxide bond in the molecular chain with a modified polyolefin having a functional group in the molecular chain. The component (c) is a component that contributes to compatibilizing the polyamide of the component (a) and the thermoplastic polyester of the component (b).

The modified polyolefin having a functional group in the molecular chain (hereinafter, simply referred to as “modified polyolefin”), which is one of the raw materials for producing the component (c), is ethylene and an α-olefin having 3 to 20 carbon atoms or a diene such as propylene. , Butene-1, pentene-1,4-methylpentene-1, isobutylene, 1,4-hexadiene, dicyclopentadiene, 2,5-norbornadiene, 5-ethyl-2,5-
Norbornagen, 5-ethylidene norbornene, 5-
In the polyolefin obtained by using (1'-propenyl) -2-norbornene, butadiene, isoprene and the like as a main monomer component, a carboxylic acid group represented by the following formulas (I) to (VI), a carboxylic acid metal base, a carboxylic acid ester group , A polymer having a monomer having at least one functional group selected from an acid anhydride group, an epoxy group, an acid amide group and an imide group (hereinafter referred to as “functional group-containing monomer”).

(In the above formula, R _{1 to} R ₄ represent a hydrogen atom or an aliphatic, alicyclic or aromatic residue having 1 to 30 carbon atoms, M is a monovalent metal such as sodium, potassium, magnesium, Examples of functional group-containing monomers include acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, crotonic acid, methylmaleic acid, methylfumaric acid, mesaconic acid, citraconic acid, glutaconic acid, and Methyl hydrogen maleate, methyl hydrogen itacone, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, hydroxyethyl acrylate, methyl methacrylate, 2-ethylhexyl methacrylate, hydroxyethyl methacrylate, methacrylic acid Aminoethyl, dimethyl maleate, dimethyl itaconate, metac Sodium acetate, potassium methacrylate, magnesium methacrylate, zinc methacrylate, sodium acrylate, magnesium acrylate, zinc acrylate, maleic anhydride, itaconic anhydride, citraconic anhydride, endobicyclo- [2,2,1] -5-heptene-2,3-dicarboxylic acid, endobicyclo- [2,2,1] -5-heptene-2,3-dicarboxylic anhydride, glycidyl acrylate,
Glycidyl methacrylate, allyl glycidyl ether,
Α, β-Unsaturated carboxylic acid derivatives such as vinyl glycidyl ether, vinyl acetate and acrylamide, as well as α, β-unsaturated carboxylic acid or anhydride thereof described above, with ammonia, methylamine, ethylamine, butylamine, hexylamine and dodecyl. Amine, oleylamine, stearylamine, cyclohexamine, benzylamine, aniline, naphthylamine, dimethylamine,
Diethylamine, methylethylamine, dibutylamine, distearylamine, dicyclohexylamine, ethylcyclohexylamine, methylaniline, phenylnaphthylamine, melamine, ethanolamine, 3-amino-1-propanol, diethanolamine, morpholine, α-amino-1-pyrrolidone, α-amino-ε-
Caprolactam, α-monomethylamino-ε-caprolactam, α-monoethylamino-ε-caprolactam,
Examples include N-substituted amide compounds and N-substituted imide compounds obtained by adding α-monobenzylamino-ε-caprolactam, nylon 6 oligomer having a terminal amino group, and the like.

As a method for producing a modified polyolefin by introducing a functional group-containing monomer into polyolefin, for example, α-
A method of copolymerizing a monomer such as an olefin and the functional group-containing monomer or a method of graft-polymerizing the monomer with a polyolefin can be applied. Here, the amount of the functional group-containing monomer to be introduced into the polyolefin is preferably 0.001 to 1 in the content of the structural unit based on the monomer in the modified polyolefin.
It is 70% by weight, more preferably 0.01 to 60% by weight.

The modified polyolefins preferable as the raw materials for producing the component (c) are listed below. In the following, "g" means, for example, "X-g-Y" means "a graft copolymer of X and Y". Shall be represented. That is, preferable modified polyolefins include, for example, ethylene / acrylic acid copolymers, ethylene / methacrylic acid / sodium methacrylate copolymers, ethylene / methacrylic acid / zinc methacrylate copolymers, ethylene / methyl methacrylate / methacrylic acid. / Magnesium methacrylate copolymer,
Ethylene / isobutyl acrylate / methacrylic acid / zinc methacrylate copolymer, ethylene / methyl acrylate copolymer, ethylene / methyl acrylate / acrylic acid copolymer, ethylene / ethyl acrylate copolymer, ethylene / methacrylic acid Glycidyl copolymer, ethylene / vinyl acetate / glycidyl methacrylate copolymer, polyethylene-g-maleic anhydride copolymer, polypropylene-g-
Maleic anhydride, poly (ethylene / propylene) -g-
Maleic anhydride, poly (ethylene / propylene / 1,4
-Hexadiene) -g-maleic anhydride, poly (ethylene / propylene / dicyclopentadiene) -g-maleic anhydride, poly (ethylene / propylene / 5-ethylidene norbornene) -g-maleic anhydride, poly (ethylene / propylene) ) -G-Endobicyclo- [2,2,1] -5-heptene-2,3-dicarboxylic anhydride, poly (ethylene / methacrylic acid / zinc methacrylate) -g-nylon 6 oligomer having an average degree of polymerization of 10, Poly (ethylene / propylene) -g-maleic anhydride-added cyclohexylamine copolymer, poly (ethylene / propylene) -g-maleic anhydride-added α-amino-ε-caprolactam And so on.

The modified polyolefin has a melt index of preferably 0.05 to 50 g / 10 minutes, more preferably 0.1 to 30 g / 10 minutes. If the melt index is out of these ranges, it is not preferable because the kneading processability is poor at the time of grafting the modified polyolefin with the following addition polymer.

The addition polymer having a peroxide bond in the molecular chain, which is the other raw material for producing the component (c) (hereinafter, simply referred to as "addition polymer").
Is an addition polymer having a peroxide bond in either or both of the main chain and the side chain in the molecular chain.

Such an addition polymer is an allyl compound and / or an acryloyloxy group- or methacryloyloxy group-containing compound having a non-conjugated and / or conjugated vinyl monomer and a peroxide bond (hereinafter, these are referred to as “compound having a peroxide bond”). And) are added by an ordinary method to obtain an addition polymer obtained by addition-polymerizing the vinyl monomer and a compound having a peroxide bond. It may be any addition polymer obtained by addition-polymerizing a vinyl monomer which is the same as or different from the vinyl monomer.

Here, examples of the conjugated vinyl monomer include methyl methacrylate, butyl methacrylate, methyl acrylate, butyl acrylate, 3 vinyl methyl acrylate, styrene, vinyl anisole, and the like, and examples of the non-conjugated vinyl monomer include: Examples thereof include vinyl acetate, vinyl chloride, vinyl fluoride, vinyl ketone and vinyl ether. Representative examples of the allyl compound having a peroxide bond include allyl t-butyl peroxycarbonate, but in addition to this, any compound or derivative having an allyl group and having a peroxide bond is not limited thereto. Not something. Examples of the acryloyloxy or methacryloyloxy group-containing compound having a peroxide bond include acryloyloxy t-butyl peroxycarbonate and methacryloyloxy t-butylperoxycarbonate.

Preferred examples of the addition polymer are listed below, but in the following, "b" means "X-Y-block copolymer" in the case of "X-B-Y", for example. .
That is, as the addition polymer, for example, poly (vinyl acetate / allyl t-butylperoxycarbonate-b-styrene) addition polymer, poly (n-butylmethacrylate / methacryloyloxymethyl t-butylperoxycarbonate-b-styrene) attached Addition polymer, poly (acetic acid n
-Butyl / methacryloyloxymethyl t-butyl peroxycarbonate-b-styrene) addition polymer, poly (butyl methacrylate / methacryloyloxymethyl t)
-Butyl peroxycarbonate-b-methyl methacrylate) addition polymer, poly (vinyl acetate / allyl t-butyl peroxycarbonate-b-methyl methacrylate)
An addition polymer etc. can be mentioned.

Such an addition polymer preferably has an average molecular weight of 100
0 to 200,000, more preferably 5,000
It is 0 to 100,000. If the average molecular weight is out of these ranges, the kneading processability in the grafting with the modified polyolefin is deteriorated, which is not preferable. The content of the peroxide bond in the addition polymer is preferably 0.5 to 30% by weight as a constitutional unit based on the compound containing the peroxide bond.
And more preferably 1 to 25% by weight. When the content of the peroxide bond in the addition polymer is too small, the grafting effect in the grafting with the modified polyolefin is significantly reduced, which is not preferable. On the other hand, when the amount is too large, gelation occurs in the grafting with the modified polyolefin, and a preferable grafted polyolefin-modified product cannot be obtained.

The grafted polyolefin modified product of the component (c) can be obtained by graft-polymerizing an addition polymer to the above-mentioned modified polyolefin by a conventional method.

Here, the use ratio of the modified polyolefin and the addition polymer is not particularly limited, but preferably 50 to 99% by weight of the modified polyolefin and 1 to 5 of the addition polymer.
0% by weight, and more preferably modified polyolefin 5
3 to 45% by weight of the addition polymer is used with respect to 5 to 97% by weight. When the amount of the addition polymer used is too small, when the resulting grafted polyolefin-modified product is added to the mixture of the polyamide and the thermoplastic polyester, problems such as the inability to obtain a composition giving preferable physical properties may occur. Occurs. On the other hand, if the amount is too large, it is not possible to form a dense structure of the thermoplastic polyester or polyamide particles, and it is not possible to obtain a composition that gives preferable physical properties. Examples of the grafted polyolefin modified product of the component (C) include poly (ethylene / acrylic acid) -g-poly (butyl acrylate-b-styrene), poly (ethylene / methacrylic acid / sodium methacrylate) -g-. Poly (butyl acrylate-b-styrene), poly (ethylene / methacrylic acid / zinc methacrylate) -g-poly (butyl acrylate-b-styrene), poly (ethylene / methyl methacrylate / magnesium methacrylate) -g -Poly (butyl acrylate-b-styrene), poly (ethylene / isobutyl acrylate / methacrylic acid / methacrylic acid / zinc methacrylate) -g-poly (butyl acrylate-b-styrene), poly (ethylene / acrylic acid Methyl) -g-poly (butyl acrylate-b-styrene),
Poly (ethylene / methyl acrylate / acrylic acid) -g
-Poly (butyl acrylate-b-styrene), poly (ethylene / ethyl acrylate) -g-poly (butyl acrylate-b-styrene), poly (ethylene / glycidyl methacrylate) -g-poly (butyl acrylate) -B-styrene), poly (ethylene / vinyl acetate / glycidyl methacrylate) -g-poly (butyl acrylate-b-styrene), (polyethylene-g-maleic anhydride) -g-poly (butyl acrylate-b) -Styrene), (polypropylene-g-maleic anhydride) -g-poly (butyl acrylate-b-styrene), (polypropylene-g-maleic anhydride) -g-poly (butyl acrylate-b-styrene), Poly [(ethylene / propylene) -g-maleic anhydride] -g-poly (butyl acrylate-b-styrene), poly [(ethyl On / propylene / 1,4 Hekisajen)-g-maleic anhydride]-g-poly (butyl acrylate -b- styrene), poly [(ethylene / propylene / dicyclopentadiene)-g-maleic anhydride]
-G-poly (butyl acrylate-b-styrene), poly [(ethylene / propylene) -g-α-amino-ε-caprolactam adduct to maleic anhydride] -g-poly (butyl acrylate-b- Styrene), poly (ethylene / acrylic acid) -g-poly (butyl acrylate-b-methyl acrylate), poly (ethylene / methacrylic acid / sodium methacrylate) -g-poly (butyl acrylate-b-acrylic acid) Methyl), poly (ethylene / methacrylic acid / methacrylic acid) -g-poly (butyl acrylate-
b-methyl acrylate), poly (ethylene / methacrylic acid / zinc methacrylate) -g-poly (butyl acrylate-b-methyl acrylate), poly (ethylene / methyl methacrylate / methacrylic acid / magnesium methacrylate)- g-poly (butyl acrylate-b-methyl acrylate), poly (ethylene / isobutyl acrylate / methacrylic acid / zinc methacrylate) -g-poly (butyl acrylate-b-methyl acrylate), poly (ethylene / Methyl acrylate) -g-Poly (butyl acrylate-b-
Methyl acrylate), poly (ethylene / methyl acrylate / acrylic acid) -g-poly (butyl acrylate-b-
Methyl acrylate), poly (ethylene / ethyl acrylate) -g-poly (butyl acrylate-b-methyl acrylate), poly (ethylene / glycidyl methacrylate)-
g-poly (butyl acrylate-b-methyl acrylate), poly (ethylene / vinyl acetate / glycidyl methacrylate) -g-poly (butyl acrylate-b-methyl acrylate), (polyethylene-g-maleic anhydride) ) −
g-poly (butyl acrylate-b-methyl acrylate), (polypropylene-g-maleic anhydride) -g-
Poly (butyl acrylate-b-methyl acrylate), poly [(ethylene / propylene) -g-maleic anhydride]
-G-poly (butyl acrylate-b-methyl acrylate) and the like can be mentioned.

The following formula of the addition polymer in the grafted polyolefin modified product of the component (c); The graft efficiency calculated from the above is preferably 1% or more, more preferably 5% or more. If the grafting efficiency is too low, the compatibilizing effect between the polyamide and the thermoplastic polyester is not recognized, which is not preferable.

Further, the grafted polyolefin modified product of the component (c) preferably has a melt index of 0.01 to 40 g.
/ 10 minutes, more preferably 0.1 to 30 g / 1
0 minutes. Usually, when the modified polyolefin and the addition polymer are grafted, the melt index is significantly lowered, but the effect of the present invention is not affected at all. When the melt index is more than 40 g / 10 minutes, a composition that gives preferable physical properties cannot be stably obtained when added to polyamide and thermoplastic polyester.

The resin composition of the present invention has a predetermined amount of the component (c) with respect to a mixture obtained by mixing the predetermined amounts of the component (a) and the component (b).
Can be obtained by blending.

The blending amount of the component (a) and the component (b) is such that the component (a) is 5
95% by weight, and the component (b) is 95 to 5% by weight. When the content of the component (a) is less than 5% by weight, the excellent advantages such as chemical resistance and abrasion resistance of polyamide are not exhibited and the disadvantages such as hydrolyzability of thermoplastic polyester are exhibited. Not preferable. On the other hand, if the content of the component (a) exceeds 95% by weight, the water absorption is high and the dimensional change is large, which is not preferable. Furthermore, the preferable mixing ratio of the component (a) and the component (b) is 35 to 9 for the component (a).
0% by weight, and component (b) is 65 to 10% by weight. In the present invention, it is preferable that the polyamide constituting the composition and the thermoplastic polyester form a so-called sea / island structure (here, sea represents the thermoplastic polyester, and the island represents the polyamide, and The island structure means a state in which polyamide particles having a slightly larger particle size are dispersed in a thermoplastic polyester particle having a smaller particle size), and the component (a) is contained in the above preferable mixing ratio.
When the compounding ratio of the above is less than 35% by weight, the above-mentioned sea / island structure cannot be formed, which is not so preferable.

The blending amount of the component (c) is 0.5 to 4 with respect to 100 parts by weight of the mixture of the component (a) and the component (b) having the above blending ratio.
It is 0 part by weight, preferably 1 to 35 parts by weight, and more preferably 2 to 30 parts by weight. Here, when the amount of the component (c) is less than 0.5 part by weight, the effect of compatibilizing the components (a) and (b) decreases, so that the composition is melt-kneaded. In addition, since it is not possible to uniformly disperse both components and the particle size of both dispersed components becomes large, it is not possible to obtain a compact having a dense and homogeneous structure, It causes deterioration and variation. Further, when the blending amount of the component (c) exceeds 40 parts by weight, it becomes difficult to exhibit the characteristics possessed by the component (a) and the component (b).

Moldability of the resin composition of the present invention, other components unless impairing the physical properties, such as pigments, dyes, reinforcing materials, fillers, heat-resistant agents, antioxidants, weathering agents, lubricants, crystal nucleating agents,
An antiblocking agent, a release agent, a plasticizer, a flame retardant, an antistatic agent, other polymers and the like can be added and blended. In particular, the addition of reinforcing materials and fillers is important, and glass fibers, asbestos fibers, carbon fibers, graphite fibers, wollastonite, talc, calcium carbonate, mica, clay, potassium whisker titanate, glass beads, or other fibrous or powdery materials. A reinforcing agent can be added and compounded.

The method for producing the resin composition of the present invention is not particularly limited, and for example, a method of melt kneading the components (a) to (c) using a uniaxial or multiaxial extruder can be applied.

The resin composition of the present invention is melt-kneaded as described above, and then molded by a method such as injection molding, extrusion molding, blow molding or compression molding to obtain a molded product having excellent mechanical properties. it can. This molded article is formed by uniformly dispersing the respective constituent components. In particular, the thermoplastic polyester as the component (b) has a mean particle size of 2 μm or less, more preferably 1 μm or less. It is what exists inside. This shows that the resin composition was melt-kneaded in a uniform state, and that the obtained molded body had a dense and homogeneous structure.

Such a molded product is useful as a constituent material for various automobile parts, mechanical parts, electric or electronic parts, and general sundries.

[Examples] Hereinafter, the present invention will be described in more detail with reference to Examples.
In addition, the evaluation of each characteristic of the molded article below was performed by the following methods.

(1) Tensile strength: ASTM D638 (2) Tensile elongation at break: ASTM D638 (3) Bending strength: ASTM D790 (4) Bending elastic modulus: ASTM D790 (5) Izod impact strength: ASTM D256 (6) Thermal deformation temperature : Measured 10 times according to ASTM D648, and the display shows the minimum value, the maximum value and the average value.

(7) Dispersed particle diameter of thermoplastic polyester: A small piece of each molded product was prepared using a microtome, the small piece was dyed with Rhodamine B, washed with water, and then, an optical microscope (× 100) was used.
In 0), the particle size of the thermoplastic polyester particles in the small piece was measured.

Examples 1 to 13 and Comparative Examples The following components were used as the components (a) to (c) of the resin composition of the present invention, and the resin compositions were prepared by combining and blending the components shown in the table. It manufactured and manufactured the test piece for each characteristic evaluation as a molded object.

Ingredients (a) (a) -1 Nylon 66 (nylon 66 manufactured by Ube Industries, grade name 2020B) (a) -2 Nylon 6 (nylon 6 manufactured by Ube Industries, grade name 1013B) (a)- 3 Nylon 12 (Nylon 12 manufactured by Ube Industries, grade name 3035U) Component (b) (b) -1 Polyethylene terephthalate (polyethylene terephthalate manufactured by Mitsui Pet Co., Ltd., grade name J1)
25) (b) -2 Polybutylene terephthalate (polybutylene terephthalate manufactured by Teijin Ltd., grade name C7000) Component (c) (c) -1 Poly (ethylene / glycidyl methacrylate) copolymer (ethylene / glycidyl methacrylate) = 8
5/15) 70 parts by weight and 30 parts by weight of poly (butyl acrylate-b-methyl acrylate) (butyl acrylate / methyl acrylate = 10/90) having a peroxide bond in the side chain are melt extruders. Poly (ethylene / glycidyl methacrylate) -g-poly (butyl acrylate-b-methyl acrylate) obtained by melt-kneading at a melting temperature of 200 ± 20 ° C. using a modified grafted polyolefin (NOF Co., Ltd., grade name Modiper A420
0) (c) -2 Poly (ethylene / glycidyl methacrylate) copolymer (ethylene / glycidyl methacrylate = 8
5/15) 70 parts by weight and 30 parts by weight of poly (butyl acrylate-b-styrene) (butyl acrylate / styrene = 10/90) having a peroxide bond in the side chain are melted using a melt extruder. Poly (ethylene / glycidyl methacrylate) obtained by melt-kneading at a temperature of 200 ± 20 ° C.-g-
Poly (butyl acrylate-b-styrene) -modified grafted polyolefin (manufactured by NOF CORPORATION, grade name, MODIPER A4100) A molded body was manufactured by the following method. First, the respective components in the amounts shown in the table were premixed, and then melt-kneaded at 280 ° C. into pellets using an extruder having a screw diameter of 30 mm. Then, the pellets were vacuum-dried and then injection-molded by an injection molding machine under the conditions of a cylinder temperature of 280 ° C. and a mold temperature of 80 ° C. to obtain a molded body. An evaluation test was conducted using the obtained molded product as a test piece for each characteristic evaluation. The results are shown in the table.

As is clear from the table shown above, each of the molded articles of the examples shows excellent values in terms of tensile strength, elongation at break at tensile, bending strength, flexural modulus and Izod impact strength, and thermal deformation. The temperature is high and the variation is small, and in particular, for each of these characteristics, the smaller the blending amount of the component (c) within the range of the predetermined blending amount, the better results are obtained. Further, the average particle size of the thermoplastic polyester dispersed in the molded product is 2 μm or less in most cases, and is 1 μm or less in most cases. This indicates that the components were melt-kneaded in a uniform state, and that the molded body had a dense and homogeneous structure.

On the other hand, each molded product of Comparative Example exhibited excellent values in tensile strength, flexural strength and flexural modulus, but low tensile elongation at break and Izod impact strength. In addition, there was an example in which the heat distortion temperature showed a high value, but in each case, the variation was extremely large. The average particle size of the thermoplastic polyester dispersed in the molded product was 3 μm or more in all cases. this is,
When the polyamide and the polyester are melt-kneaded, the uniformity of both components is inferior to that of the example.

[Effects of the Invention] As described above, the composition of the present invention contains fine particles of a polyamide and a thermoplastic polyester, which are originally incompatible, by using the grafted polyolefin modified material as a constituent component, and It can be mixed and dispersed in a uniform state.

Further, the molded body of the present invention has a very fine and homogeneous structure, and therefore has very excellent mechanical properties, and its heat distortion temperature is high and its variation is small,
Furthermore, the molded body does not cause layer separation.

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Claims (1)

[Claims] 1. A mixture of 100 parts by weight of a mixture of (a) 5 to 95% by weight of polyamide and (b) 95 to 5% by weight of a thermoplastic polyester, and (c) a modified polyolefin having a functional group in its molecular chain, 0.5 to 35 parts by weight of a grafted polyolefin modified product obtained by graft-polymerizing an addition polymer having a peroxide bond in the molecular chain, wherein the thermoplastic polyester is dispersed as particles having an average particle size of 2 μm or less. A resin composition comprising: