JPH05194843A - Resin composition - Google Patents

Abstract

PURPOSE:To obtain a resin composition improved in water absorptivity and dimensional stability by mixing a nylon 46 resin with pellets of a mixture of a polyarylate resin with a polyalkylene terephthalate resin and an imidized polyacrylate in a specified mixing ratio. CONSTITUTION:A polyarylate resin is mixed with a polyalkylene terephthalate resin (e.g. polytetramethylene terephthalate) in a ratio of 20/80 to 40/60, and the resulting mixture is pelletized. 100 pts.wt. nylon 46 resin is mixed with 10-100 pts.wt. obtained pellets and 0.5-20 pts.wt. imidized polyacrylate to produce the objective resin composition. Since the polyacrylate resin is mixed with the polyalkylene terephthalate resin prior to pelletization, the compatibilizing effect of the imidized polyacrylate can be fully exhibited. Therefore, the composition improved in water absorptivity and dimensional stability without detriment to the heat resistance of the nylon 46 resin and the heat resistance of the polyarylate resin can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition, more specifically, polytetramethylene adipamide (nylon 4) which exhibits excellent heat resistance, mechanical properties, water absorption properties and dimensional properties.
6) Regarding resin.

[0002]

Nylon 46 resins obtained from tetramethylenediamine or its functional derivative and adipic acid or its functional derivative are known.

This nylon 46 resin is considered to have great utility value as a useful engineering plastic because it has excellent heat resistance and mechanical properties such as tensile strength and bending strength and sliding properties.

However, this nylon 46 resin has a drawback that its water absorption rate is higher than those of ordinary polyamide resins such as nylon 6 resin and nylon 66 resin because it has a higher proportion of amide groups.

This means that nylon 46 resin has superior heat resistance and mechanical properties to general polyamide resins in the dry state immediately after molding, but has a higher water absorption rate than ordinary polyamide resins in actual use. As a result, the impact properties and the like are further improved, but the heat resistance and mechanical properties are more deteriorated than those, and in some cases, the superiority of nylon 46 resin is lost. Like ordinary polyamide resins, nylon 46 resin also changes its dimensions due to water absorption. Since nylon 46 resin has a high degree of crystallinity, the dimensional change rate per water absorption rate is smaller than that of ordinary polyamide resin, but the degree of dimensional change due to water absorption is not at a satisfactory level due to its high water absorption rate. However, this is a major obstacle in applying it to applications where the excellent properties of nylon 46 resin as engineering plastics can be utilized.

There have been many methods for reducing the water absorption by blending an ordinary polyester resin represented by nylon 6 resin or nylon 66 resin with an aromatic polyester resin. Polyamide resin and aromatic polyester resin are essentially incompatible with each other, but Japanese Patent Publication No. 64-153 and Japanese Patent Publication No. 1-44259.
No. 5, JP-A-58-154725, 59-142224.
No. 4, No. 60-63256, No. 61-204259
No. 61-204264, No. 61-213256
No. 61-213257, No. 62-277462
No. 63-202656, No. 63-275659
No. 63-304048, No. 64-31865,
JP-A-1-190755, 1-204963, 1-215853, 1-240559, 1-2
In 68751 and the like, many attempts have been made to enhance the compatibility of the two mainly with an ethylene copolymer having a carboxylic acid group, an acid anhydride group, a derivative of a carboxylic acid metal base or the like, a glycidyl group or the like. ..

Among the aromatic polyester resins, polyarylate resin is particularly known as a resin having excellent heat resistance, and it also means that the characteristics of nylon 46 resin, which also has high heat resistance, can be maintained. Therefore, an attempt to combine nylon 46 resin and polyarylate resin is made. JP-A-64-31865, JP-A-2-206650, JP-A-2-213066 and JP-A-3-
It is proposed in Japanese Patent Publication No. 95265.

However, since the molding temperature of both the nylon 46 resin and the polyarylate resin is high, there remains a problem that the heat resistance of other compounds blended for the purpose of enhancing the compatibility between them is insufficient.

[0009]

OBJECTS OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to improve the water absorption characteristics and dimensional characteristics while maintaining the excellent heat resistance and mechanical characteristics of nylon 46 resin. It is in.

[0010]

The present inventors have conducted extensive studies to improve the water absorption properties and dimensional properties of nylon 46 resin. As a result, the nylon 46 resin is provided with a specific amount of polyarylate resin, polyalkylene terephthalate resin, and imidized polyacrylate. The present invention has been completed by finding that the composition formulated by the specific method meets the above-mentioned object.

That is, the resin composition of the present invention comprises (A)
A mixture in which (B) polyarylate resin and (C) polyalkylene terephthalate resin are pelletized in advance in a ratio of (B) / (C) = 20/80 to 40/60 per 100 parts by weight of nylon 46 resin. 10 to 100 parts by weight,
And (D) an imidized polyacrylate of 0.5 to 20 parts by weight.

The present invention will be described. The (A) component nylon 46 resin used in the present invention mainly refers to a polyamide obtained by a condensation reaction using adipic acid or its functional derivative as an acid component and tetramethylenediamine or its functional derivative as an amine component. However, a part of the adipic acid component or the tetramethylenediamine component may be replaced with another copolymerization component.

Preferred embodiments of nylon 46 resin are JP-A-56-149430 and JP-A-56-1494.
No. 31 publication.

The intrinsic viscosity of the nylon 46 resin used in the present invention is in the range of 0.90 to 1.90, more preferably 1.00 to 1.50, when measured with m-cresol at 35 ° C. Is desirable.

Nylon 46 with an intrinsic viscosity exceeding 1.90
When a resin is used, the fluidity of the composition in the molten state is poor, the gloss of the appearance of the resulting molded article is lost, and the variations in its mechanical properties and thermal properties become large, which is not preferable.

On the other hand, when the intrinsic viscosity is lower than 0.90, the mechanical strength of the composition becomes small.

The component (B) polyarylate resin used in the present invention is represented by the following general formula (Formula 1).

[0018]

[Chemical 1]

It is obtained from a bisphenol compound represented by and an aromatic dicarboxylic acid, wherein --X
“—” Is any of —O—, —S—, —SO ₂ —, —CO—, and an alkylene group, and R _{1 to} R ₈ are any of hydrogen, an alkyl group having 1 to 8 carbon atoms, and halogen. ..

Examples of the bisphenol compound represented by the general formula (Formula 1) include 4,4'-dihydroxy-diphenyl ether, bis (4-hydroxy-2-methylphenyl) ether, and bis (4-hydroxy-3-chlorophenyl) ether. , Bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) ketone, bis (4-hydroxyphenyl) methane, bis (4-hydroxy-3-methylphenyl) methane, bis (4-hydroxy-3,5) -Dichlorophenyl) methane, bis (4
-Hydroxy-3,5-dibromophenyl) methane,
1,1-bis (4-hydroxyphenyl) ethane, 2,
2-bis (4-hydroxyphenyl) propane, 2,2
-Bis (4-hydroxy-3-methylphenyl) propane, 2,2-bis (4-hydroxy-3-chlorophenyl) propane, 2,2-bis (4-hydroxy-3,5)
-Dichlorophenyl) propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, 1,
1-bis (4-hydroxyphenyl) butane, bis (4
-Hydroxyphenyl) phenylmethane, bis (4-hydroxyphenyl) diphenylmethane, bis (4-hydroxyphenyl) -4'-methylphenylmethane, 1,
1-bis (4-hydroxyphenyl) -2,2,2-trichloroethane, bis (4-hydroxyphenyl)-
(4'-chlorophenyl) methane, 1,1-bis (4-
Hydroxyphenyl) cyclohexane, 1,4-bis (4-hydroxyphenyl) cyclohexane, 2,2-
Examples thereof include bis (4-hydroxynaphthyl) propane, and 2,2-bis (4-hydroxyphenyl) propane is particularly preferable. Further, these bisphenol compounds may be a mixture of two or more kinds, and further other divalent compounds such as 2,2'-dihydroxydiphenyl, dihydroxynaphthalene, hydroquinone, resorcinol, 2,6-
A mixture with dihydroxychlorobenzene, 2,6-dihydroxytoluene, 3,6-dihydroxytoluene and the like may be used.

The aromatic dicarboxylic acid is preferably terephthalic acid, isophthalic acid, or a mixture thereof.
Further, these terephthalic acid and isophthalic acid may be substituted with halogen or an alkyl group having 1 to 8 carbon atoms. In addition to these, a small amount of other aromatic or aliphatic dicarboxylic acid or its functional derivative may be copolymerized.

The polyarylate used in the present invention can be produced by a conventional production method such as interfacial polymerization, solution polymerization and melt polymerization.

The preferred molecular weight of this polyarylate is 5,000 to 100,000 in terms of weight average molecular weight.

The polyalkylene terephthalate resin as the component (C) used in the present invention has an acid component of terephthalic acid, and a diol component of ethylene glycol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol, neopentyl glycol. It is an aromatic polyester comprising at least one of aliphatic diols such as

Among these, polytetramethylene terephthalate, polypropylene terephthalate, polyethylene terephthalate and the like, which have a high crystallization rate, are preferable, and polytetramethylene terephthalate and polyethylene terephthalate are particularly preferable. Further, the polyalkylene terephthalate resin may be a resin obtained by substituting a part of the above polyester with a copolymerization component, and examples of such a copolymerization component include phthalic acid such as isophthalic acid, phthalic acid, methylterephthalic acid and methylisophthalic acid. Derivatives: 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid,
Naphthalenedicarboxylic acids such as 1,5-naphthalenedicarboxylic acid and derivatives thereof; Diphenylcarboxylic acids such as 4,4′-diphenyldicarboxylic acid and 3,4′-diphenyldicarboxylic acid and derivatives thereof; 4,4′-Diphenoxymethane Aromatic dicarboxylic acids such as dicarboxylic acid and 4,4'-diphenoxyethanedicarboxylic acid; Aliphatic or alicyclic dicarboxylic acids such as succinic acid, adipic acid, sebacic acid, azelaic acid, decanedicarboxylic acid and cyclohexanedicarboxylic acid; Alicyclic diols such as 1,4-cyclohexanedimethanol; dihydroxybenzenes and derivatives thereof such as hydroquinone and resorcin; 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (4-hydroxyphenyl) sulfone Bisphenol compounds such as; Aromatic diols such as polyether diols obtained from Knoll compound with a glycol such as ethylene glycol; .epsilon. hydroxycaproic acid, hydroxybenzoic acid, and oxydicarboxylic acids such as hydroxy-ethoxy benzoic acid.

Branching components of the above polyalkylene terephthalate resin, such as tricarballylic acid, trimesic acid, trimellitic acid, and other trifunctional or tetrafunctional ester-forming acids, or glycerin, trimethylolpropane, pentaerythritol, etc. The alcohol having a trifunctional or tetrafunctional ester-forming ability of 1.0 mol% or less, preferably 0.5 mol% or less, more preferably 0.3 mol% or less may be copolymerized.

Further, two or more kinds of the polyalkylene terephthalate resins may be used in combination.

The intrinsic viscosity of the polyalkylene terephthalate resin used in the present invention is 0.5 or more when measured at 35 ° C. with o-chlorophenol, but the intrinsic viscosity is 0.9 or more. Those having

Usually, the polyalkylene terephthalate resin having an intrinsic viscosity of 0.5 or more is used, and among them, the one having a range of 0.5 to 0.9 is preferably used because the fluidity at the time of molding is particularly good. Has been done. However, when compounded with nylon 46 resin, the molding temperature is 300
Since the polyalkylene terephthalate resin having an intrinsic viscosity in this range is high, mechanical properties such as toughness are good, but a decrease in molecular weight is large and sufficient melt heat stability may not be exhibited. When a polyalkylene terephthalate resin having an intrinsic viscosity of 0.9 or more is used, it is possible to obtain a composition having not only mechanical properties such as toughness but also good melt heat stability.

On the other hand, a polyalkylene terephthalate resin having an intrinsic viscosity of 1.5 or more is not preferable because the fluidity is deteriorated and variations in mechanical properties are increased.

The polyalkylene terephthalate resin used in the present invention can be produced by a usual production method, for example, a melt polycondensation reaction or a method in which this is combined with a solid phase polycondensation reaction. For example, a production example of polytetramethylene terephthalate will be described. Terephthalic acid or its ester-forming derivative (for example, dimethyl ester,
A lower alkyl ester such as monomethyl ester) and tetramethylene glycol or an ester-forming derivative thereof are reacted by heating in the presence of a catalyst, and the resulting glycol ester of terephthalic acid is polymerized to a predetermined degree of polymerization in the presence of a catalyst. Polytetramethylene terephthalate can be produced by the method.

In order to improve the water absorption property of the nylon 46 resin, even if these polyarylate resins and polyalkylene terephthalate resins are attempted to be blended alone or at the same time, or after they are mixed in advance, the compatibility between them is very high. Since it is bad, extrusion and molding cannot be performed in a good state, and the properties of the obtained molded product are inferior.

In the present invention, the imidized polyacrylate as the component (D) is used for the purpose of enhancing the compatibility between the nylon 46 resin and the aromatic polyester component.

The imidized polyacrylate as the component (D) is represented by the following general formula (Formula 2)

[0035]

[Chemical 2]

A polymer containing a structural unit represented by the following formula, wherein R ₉ and R ₁₀ are hydrogen or an alkyl group having 1 to 8 carbon atoms, and R ₁₁ is hydrogen, an alkyl group having 1 to 8 carbon atoms, or aryl. A group selected from a group, an alkaryl group and an aralkyl group. The alkyl group having 1 to 8 carbon atoms is methyl, ethyl, n-propyl, sec-propyl, n-
It is a linear, branched or cyclic alkyl group such as butyl, isobutyl, pentyls, hexyls, cyclohexyl, heptyls, octyls, and the like, and may contain a hydroxyl group, a halogen atom or the like. The most preferable one of R ₉ , R ₁₀ and R ₁₁ is a methyl group.

The imidized polyacrylate may be a copolymer containing not only the structural unit represented by the above (Chemical Formula 2) but also unreacted acrylic units and other structural units. Preferred copolymers contain at least 5% imidized constitutional units, preferably 50%, more preferably 70% imidized constitutional units. As the copolymerization component, acrylic acid and its alkyl ester, methacrylic acid and its alkyl ester, acrylic anhydride,
Other than acrylamide, methacrylamide, acrylonitrile, methacrylonitrile and the like, styrene, vinyl chloride and the like can be mentioned, with preference given to methyl acrylate and methyl methacrylate. Further, two or more kinds of this copolymerization component may be present at the same time.

The imidized polyacrylate is obtained by reacting a methacrylic acid-methacrylic acid ester copolymer with ammonia, amine, urea or a substitution product thereof at a high temperature, reacting polymethacrylic anhydride with ammonia or amine, methacrylic acid. Obtained by such methods as thermal reaction resulting in the imide ring of an ester-methacrylamide copolymer and reaction of a polymer having a high proportion of acrylic acid or methacrylic acid ester groups with ammonia or amine in solution or in the melt. However, the preferred method is the method described in US Pat. No. 4,246,374 or JP-A-59-117550.

In the imidized polyacrylate, the carboxylic acid group derived from the unreacted acrylic acid component and the acid anhydride group by-produced during imidization are reduced or removed by the method described in US Pat. No. 4,727,117. Although a post-treatment can be performed, it is preferable in the present invention to use a polymer containing a carboxylic acid group or an acid anhydride group in the molecule without performing such treatment.

The imidized polyacrylate as the component (D) exhibits an action of increasing the compatibility between the nylon 46 resin and the polyalkylene terephthalate resin, but does not show a compatibilizing action between the nylon 46 resin and the polyarylate resin. ..

However, when the polyalkylene terephthalate resin of the component (C) is previously kneaded with the polyarylate resin of the component (B) and pelletized as the aromatic polyester component, when the imidized polyacrylate is blended, The compatibility of nylon 46 resin with this aromatic polyester resin mixture was significantly improved.
A composition having improved water absorption characteristics and dimensional characteristics while maintaining the heat resistance of both the resin and the polyarylate resin can be obtained.

When the component (B) and the component (C) are simultaneously mixed with the nylon 46 resin without being pelletized in advance, the compatibilizing effect of the imidized polyacrylate as described above does not appear, and the resulting composition is obtained. Is inferior in mechanical properties, and it is an effect that appears only after the two are mixed in advance.

The mixing ratio of these components (B) and (C) is in the range of (B) / (C) = 20/80 to 40/60. If the proportion of the component (B) is higher than this range, the compatibilizing effect of the imidized polyacrylate will not appear, and if the proportion of the component (B) is lower than this range, the heat resistance of the resulting composition will be (C ) It is not preferable because it becomes the same as when the components are mixed alone.

The blending amount of the aromatic polyester component obtained by mixing and pelletizing the component (B) and the component (C) is
10 to 100 parts by weight per 100 parts by weight of nylon 46 resin. When the blending amount is less than 10 parts by weight, the effect of improving the desired water absorption characteristics and dimensional characteristics is small.
When the amount is more than 100 parts by weight, the characteristics of nylon 46 resin are lost, such as the deterioration of fluidity during molding.

Further, the compounding amount of the imidized polyacrylate as the component (D) is 0.5 to 20 parts by weight per 100 parts by weight of the nylon 46 resin. If the amount is less than 0.5 parts by weight, the compatibilizing effect between the nylon 46 resin and the aromatic polyester mixture component is small, and if it is more than 20 parts by weight, the heat resistance of the nylon 46 resin is reduced, which is preferable. Absent.

If necessary, pigments and other compounding agents may be added to the resin composition of the present invention in an expression amount. Such compounding agents include fillers such as glass fibers, aramid fibers, carbon fibers, steel fibers, asbestos, ceramic fibers, fibrous substances such as potassium titanate whiskers and boron whiskers, kaolin, clay, wollastonite, talc. , Mica, calcium carbonate, barium sulfate,
Examples are powdery, granular or plate-like inorganic fillers such as glass beads and glass flakes.

These fillers are usually blended as a reinforcing material, a surface modifier, or for the purpose of modifying electrical and thermal properties, etc. It should be blended within a range that does not lose the excellent properties inherent to the product and the advantages in molding.

Also flame retardants such as brominated polystyrene,
Brominated polyphenylene ether, brominated epoxy, brominated bisphenol-A-diglycidyl ether and its oligomers, polycarbonate oligomer produced using brominated bisphenol-A as a raw material, brominated biphenyl ether, brominated diphthalimide compound, chlorinated hexa Halogen-containing compounds such as dimers of pentadiene; phosphorus compounds such as red phosphorus and triphenyl phosphate; phosphorus-nitrogen compounds such as phosphonamide; triazine compounds such as melamine, melam, melem, melon, cyanuric acid and melamine cyanurate. Flame retardant aids used in combination with or independently of metal hydroxides such as aluminum hydroxide, magnesium hydroxide, dawsonite, dihydrate gypsum and the above halogen-containing compounds, for example antimony compounds such as antimony trioxide, acids Boron, it is possible to blend the metal oxides such as iron oxide.

Further, a copper compound such as copper iodide, a hindered phenol compound, an aromatic amine compound, an organic phosphorus compound, a sulfur compound or the like antioxidant or heat stabilizer may be added for the purpose of improving heat resistance. .. In addition, various epoxy compounds, oxazoline compounds and the like may be added for the purpose of improving melt viscosity stability and hydrolysis resistance. Examples of epoxy compounds include bisphenol
Bisphenol-A type epoxy compound obtained by reacting A with epichlorohydrin, aliphatic glycidyl ether obtained from reaction of various glycols or glycerol with epichlorohydrin, novolac type epoxy compound,
Aromatic or aliphatic carboxylic acid type epoxy compounds, alicyclic compound type epoxy compounds and the like are preferable, and as the oxazoline compound, aromatic or aliphatic bisoxazoline,
Especially 2,2'-bis (2-oxazoline), 2,2'-
m-Phenylenebis (2-oxazoline) is preferred.

Other stabilizers, colorants, lubricants, UV absorbers and antistatic agents can also be added.

Furthermore, a small amount of other thermoplastic resin such as other polyamide resin, other polyester resin, polyphenylene sulfide resin, polyphenylene ether resin, polycarbonate resin, phenoxy resin, polyethylene and its copolymer, polypropylene and Its copolymers, polystyrene and its copolymers, acrylic resins and acrylic copolymers, polyamide elastomers, polyester elastomers, etc .; thermosetting resins such as phenol resins, melamine resins, unsaturated polyester resins, silicone resins, etc. You may.

The resin composition of the present invention is preferably mixed by a mixer such as a blender, a kneader, a roll, or an extruder to homogenize the resin composition. An extruder in which a composition dry-blended in advance is heated is used. It can be carried out by a method of melt-kneading and homogenizing, then extruding into a wire shape, and then cutting into a desired length and granulating.

The molding composition produced in this way is
Usually, it is kept in a sufficiently dried state and put into a hopper of a molding machine for use in molding such as injection molding.

[0054]

The present invention will be described in detail below with reference to examples. In addition,
Various properties in the examples were measured by the following methods. (1) Mechanical strength: The tensile test complies with ASTM D638. (2) Water absorption property: Calculated from the weight increase after standing for 6 hours in an atmosphere of 80 ° C. and 95% relative humidity. (Thickness of molded product 3
mm) (3) Dimensional characteristics: Calculated from dimensional changes after leaving for 6 hours in an atmosphere of 80 ° C. and 95% relative humidity. (Thickness of molded product 3
mm) (4) Melt viscosity: According to JIS K7210, the melt viscosity (Pa · s) was measured after the resin was kept in a molten state for a certain period of time using a Koka type flow tester (manufactured by Shimadzu Corporation). Nozzle: 10/1 (L / D) mm, temperature: 300 ° C,
Load: 30 MPa, residence time; retention time of resin in molten state. (5) Intrinsic Viscosity: The intrinsic viscosity of nylon 46 resin is m-cresol as a solvent, and the intrinsic viscosity of polyalkylene terephthalate resin is o-chlorophenol at an Ostwald viscosity tube at 35 ° C.

[0055]

Examples 1-2, Comparative Examples 1-9 110 ° C., 1.3 kP
Nylon 46 resin (“STANYL” manufactured by DSM Co., Netherlands) having an intrinsic viscosity of 1.20 and dried for 12 hours under reduced pressure of a and polyarylate resin (“U polymer U-10”).
0 ”manufactured by Unitika Ltd., polytetramethylene terephthalate (produced by Teijin Ltd.) having an intrinsic viscosity of 0.92, and imidized acrylate (“ Paraloid EXL-4151 ”).
(Made by Rohm & Haas Co.) was mixed in advance with a tumbler in the proportions and methods shown in Table 1, and then a twin-screw extruder with a vent having a screw diameter of 44 mm was used to evacuate the cylinder to a cylinder temperature of 330 ° C. , Screw speed 16
The mixture was melt-kneaded at 0 rpm and a discharge rate of 40 kg / h, and the thread discharged from the die was cooled and cut to obtain molding pellets. When the polyarylate resin and polytetramethylene terephthalate were kneaded and pelletized in advance, the same conditions were used except that the cylinder temperature was 300 ° C.

Next, using the pellets, an injection molding machine with an injection capacity of 5 ounces was used to obtain various properties under the conditions of a cylinder temperature of 300 ° C., a mold temperature of 120 ° C., an injection pressure of 80 MPa, a cooling time of 15 seconds, and a total molding cycle of 40 seconds. A molded article for measurement was molded.

Each characteristic was measured using these molded products. Prior to measurement, the molded product should comply with JIS K7100
Conditioning was performed for 88 hours in an atmosphere of ° C and relative humidity of 50%.

The results are shown in Table 1.

[0059]

[Table 1]

Nylon 46 resin is excellent in heat resistance and mechanical properties, but has a defect that its water absorption is high and dimensional change due to it is large (Comparative Example 1).

Even if the nylon 46 resin and the polyarylate resin or polytetramethylene terephthalate were kneaded, compositions showing good mechanical properties could not be obtained (Comparative Examples 2 and 4). Further, even if imidized polyacrylate is further added to them, the nylon 46 resin and the polyarylate are not compatibilized (Comparative Example 3). In the case of nylon 46 resin and polytetramethylene terephthalate, the composition of imidized polyacrylate increases the compatibility of the two and makes it possible to form a composition having excellent mechanical properties, but its melt viscosity remains at a high temperature in a molten state. By doing so, the heat resistance is greatly reduced and heat resistance cannot be maintained (Comparative Example 5).

However, when polyarylate and polytetramethylene terephthalate are kneaded and pelletized in advance as the aromatic polyester component, even when polyarylate is contained, the polyimilate can be compatibilized with the imidized polyacrylate and the water absorption property can be obtained. Thus, compositions having improved dimensional characteristics can be obtained (Examples 1 and 2, Comparative Examples 8 to 9).

At this time, if the amount of polyarylate compounded is too large, the mechanical properties of the composition deteriorate, and if it is too small, the decrease in melt viscosity is almost the same as when polytetramethylene terephthalate alone is compounded. The heat resistance cannot be utilized (Comparative Examples 6 to 7).

Further, when the polyarylate and the polytetramethylene terephthalate were blended in the same blending amount without being pelletized in advance, the mechanical properties of the obtained composition were inferior (Comparative Example 10), and both were pelletized in advance. It can be seen that the use of is an essential condition.

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Claims (4)

[Claims] 1. An amount of (B) polyarylate resin and (C) polyalkylene terephthalate resin is (B) / (C) = 20/8 per 100 parts by weight of (A) nylon 46 resin.
A resin composition comprising 10 to 100 parts by weight of the mixture pelletized in a ratio of 0 to 40/60, and 0.5 to 20 parts by weight of (D) imidized polyacrylate. 2. The resin composition according to claim 1, wherein the imidized polyacrylate as the component (D) is a polymer containing a carboxylic acid and / or an acid anhydride in the molecular chain. 3. The resin composition according to claim 1, wherein the polyalkylene terephthalate resin as the component (C) is polytetramethylene terephthalate. 4. The polyalkylene terephthalate resin as the component (C) is polyethylene terephthalate.
The resin composition described.