JP7186434B2 - Resin composition and molded article obtained by molding the same - Google Patents

Description

The present invention relates to a resin composition comprising a polyarylate resin and an aliphatic polyamide resin.

Resin compositions composed of polyarylate and crystalline polyamide are excellent in chemical resistance and moldability, and are mainly used in the electric and electronic fields as metal substitute materials. Further, in order to improve the mechanical properties of resin materials, materials containing reinforcing materials such as glass fibers are known (see, for example, Patent Document 1). Resin compositions composed of polyarylate, polyamide and glass fiber are excellent in rigidity, chemical resistance, heat resistance, water resistance and moldability, and are used as mechanical parts such as watch cases, automobile parts and electrical parts.

However, even the resin composition described in Patent Document 1 cannot be said to have sufficient performance in terms of reduction in mechanical strength due to moisture absorption and suppression of dimensional change. It was difficult to satisfy the advanced characteristics required for miniaturization and high performance of parts.

JP 2010-174064 A

An object of the present invention is to solve the above problems and to provide a resin composition having low water absorbency and excellent weather resistance and chemical resistance. In addition, even when glass fibers are contained in the resin composition, the decrease in weld strength is small.

As a result of intensive research to solve the above problems, the inventors of the present invention have found that a resin composition comprising a polyarylate resin and an aliphatic polyamide resin having a specific melting point can achieve the above objects, and have completed the present invention. .

That is, the gist of the present invention is as follows.
(1) A resin composition containing a polyarylate resin (A) and an aliphatic polyamide resin (B), wherein the aliphatic polyamide resin (B) has a melting point of less than 225°C, and the polyarylate resin (A), the aliphatic A resin composition in which the mass ratio (A/B) of the group polyamide resin (B) is 80/20 to 20/80.
(2) The resin composition of (1) further containing 20 to 70 parts by mass of glass fiber (C) with respect to a total of 100 parts by mass of polyarylate resin (A) and aliphatic polyamide resin (B).
(3) The resin composition of (1) or (2), wherein the aliphatic diamine component constituting the aliphatic polyamide resin (B) is one or more selected from hexamethylenediamine and decamethylenediamine.
(4) The resin composition of (1) to (3), wherein the aliphatic dicarboxylic acid component constituting the aliphatic polyamide resin (B) is one or more selected from sebacic acid and dodecanedioic acid.
(5) The resin composition of (1) to (4), wherein the aliphatic polyamide resin (B) is one or more selected from polyamide 612, polyamide 610, polyamide 1010 and polyamide 1012.
(6) A molded article obtained by molding the resin composition of (1) to (5).

According to the present invention, it is possible to obtain a resin composition having low water absorption and excellent weather resistance and chemical resistance. In addition, even when glass fibers are contained in the resin composition, the decrease in weld strength is small.

The present invention will be described in detail below.

The resin composition of the present invention contains a polyarylate resin (A) and an aliphatic polyamide resin (B) having a melting point of less than 225°C.

The polyarylate resin (A) used in the present invention is composed of an aromatic dicarboxylic acid component and a dihydric phenol component. Polyarylate resin (A) in the present invention is an amorphous polyarylate resin. Amorphous means that no crystalline melting peak is observed when measured using a DSC (differential scanning calorimeter) or the like. The polyarylate resin (A) used in the present invention does not contain a liquid crystalline polymer having a so-called mesogenic group.

Examples of aromatic dicarboxylic acid components include terephthalic acid, isophthalic acid, phthalic acid, chlorophthalic acid, nitrophthalic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, 1 ,5-naphthalenedicarboxylic acid, methyl terephthalic acid, 4,4′-biphenyldicarboxylic acid, 2,2′-biphenyldicarboxylic acid, 4,4′-diphenyletherdicarboxylic acid, 4,4′-diphenylmethanedicarboxylic acid, 4,4 '-diphenylsulfonedicarboxylic acid, 4,4'-diphenylisopropylidenedicarboxylic acid, 1,2-bis(4-carboxyphenoxy)ethane, 5-sodiumsulfoisophthalic acid. Among them, terephthalic acid and isophthalic acid are preferable, and it is more preferable to use a mixture of both from the viewpoint of moldability and mechanical properties. The mixing molar ratio of terephthalic acid and isophthalic acid is preferably 80/20 to 20/80 (mol%), more preferably 70/30 to 25/75 (mol%), and more preferably 60/40 to 30. /70 (mol%) is more preferable.

Examples of dihydric phenol components include resorcinol, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-(4-hydroxyphenyl)butane, 2,2-(4-hydroxyphenyl)-4- Methylpentane, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane, 2,2-bis(4-hydroxy-3-methylphenyl) propane, 2,2-bis(4-hydroxy-3,5-dibromophenyl)propane, 2,2-bis(4-hydroxy-3,5-dichlorophenyl)propane, 4,4'-dihydroxydiphenylsulfone, 4, 4'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxydiphenyl ketone, 4,4'-dihydroxydiphenylmethane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 1 ,1-bis(4-hydroxyphenyl)cyclohexane, 3,3,5-trimethyl-1,1-bis(4-hydroxyphenyl)cyclohexane, and 2,2-bis(4 -hydroxyphenyl)propane is preferred. These compounds may be used alone or in combination.

Inherent viscosity measured at a concentration of 1 g/dL and a temperature of 25° C. using a mixed solution of phenol/1,1,2,2-tetrachloroethane=60/40 (mass ratio) of polyarylate resin (A) as a solvent. is preferably 0.45 or more, more preferably 0.45 to 0.75, even more preferably 0.45 to 0.65. By setting the inherent viscosity to 0.45 or more, a resin composition having good mechanical properties can be obtained.

The carboxyl value of the polyarylate resin (A) is preferably 12 equivalents/ton or more, more preferably 15 to 200 equivalents/ton. The carboxyl value of the polyarylate resin (A) is derived from the terminal carboxylic acid and the carboxylic anhydride bond formed by the side reaction. By setting the carboxyl value to 12 equivalents/ton or more, it is possible to suppress deterioration of mechanical properties when the polyarylate resin (A) and the aliphatic polyamide resin (B) are mixed.

The method for producing the polyarylate resin (A) is not particularly limited, and it can be produced by known polymerization methods such as solution polymerization, melt polymerization, and interfacial polymerization. Among these, the solution polymerization method and the interfacial polymerization method are preferable because they facilitate high molecular weight formation and avoid coloration due to heat.

The interfacial polymerization method includes a method of mixing an alkaline aqueous solution in which a dihydric phenol compound is dissolved and an organic solvent solution of an aromatic dicarboxylic acid dihalide in the presence of a polymerization catalyst, and stirring the mixture at 2 to 80°C. Examples of the solution polymerization method include a method in which a dihydric phenol compound and an aromatic dicarboxylic acid dihalide are dissolved in an organic solvent, stirred, and reacted at 2 to 80°C. Further, as a melt polymerization method, dihydric phenol is reacted with an organic carboxylic anhydride such as acetic anhydride at 100 to 200 ° C. to obtain a dihydric phenol diester, and then stirred with an aromatic dicarboxylic acid. For example, a method of raising the temperature to 300 to 360° C. under reduced pressure to carry out the transesterification reaction and distilling off the by-produced organic carboxylic acid at the same time can be mentioned.

The aliphatic polyamide resin (B) used in the present invention is an aliphatic polyamide resin having a melting point of less than 225°C. Examples of the aliphatic diamine component constituting the aliphatic polyamide resin (B) include tetramethylenediamine, decamethylenediamine, hexamethylenediamine, undecamethylenediamine, dodecamethylenediamine, 2,2,4-/2,4, 4-trimethylhexamethylenediamine, 5-methylnonamethylenediamine, 2,4-dimethyloctamethylenediamine and the like. Examples of aliphatic dicarboxylic acid components constituting the aliphatic polyamide resin (B) include adipic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, and diglycolic acid. Aminocarboxylic acid or lactam components constituting the aliphatic polyamide resin (B) include 6-aminocaproic acid, 11-aminoundecanoic acid, 12-aminododecanoic acid, ε-caprolactam, ω-undecanolactam, and ω-laurolactam. etc.

Examples of the aliphatic polyamide resin (B) include polyamide 612 (melting point 215°C), polyamide 610 (melting point 222°C), polyamide 1010 (melting point 202°C), polyamide 1012 (melting point 190°C), and polyamide 11 (melting point 187°C). , polyamide 12 (melting point 176° C.), and the like. When aliphatic polyamide resins having a melting point of more than 225°C, such as polyamide 6 (melting point of 225°C) and polyamide 66 (melting point of 265°C) are used, the resin composition is inferior in water absorption, i.e., easily absorbs moisture. , problems such as a decrease in mechanical properties and an increase in dimensional change become conspicuous.

As long as the aliphatic polyamide resin (B) has a melting point of less than 225°C, aromatic and alicyclic monomers may be copolymerized. Examples of such monomers include diamine components such as metaxylylenediamine, paraxylylenediamine, 1,3-bis(aminomethyl)cyclohexane, 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane. , 3,8-bis(aminomethyl)tricyclodecane, bis(4-aminocyclohexyl)methane, bis(3-methyl-4-aminocyclohexyl)methane, 2,2-bis(4-aminocyclohexyl)propane, bis (Aminopropyl)piperazine, aminoethylpiperazine, dicarboxylic acid components include terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, 2-chloroterephthalic acid, 2-methylterephthalic acid, 5-methylisophthalic acid, 5-sodium sulfoisophthalic acid, hexahydroterephthalic acid, hexahydroisophthalic acid and the like.

In the present invention, various aliphatic polyamide resins can be produced by polymerizing any of the above diamine components and dicarboxylic acid components. is preferably a long-chain aliphatic polyamide resin having a long carbon number, and an aliphatic polyamide obtained by combining a linear diamine having 6 to 10 carbon atoms and an aliphatic dicarboxylic acid having 10 to 12 carbon atoms. Resins are particularly preferred. More specifically, polyamide 610 composed of hexamethylenediamine (diamine having 6 carbon atoms) and sebacic acid (dicarboxylic acid having 10 carbon atoms), hexamethylenediamine (diamine having 6 carbon atoms) and dodecanedioic acid ( Polyamide 612 composed of decamethylenediamine (a carboxylic acid having 12 carbon atoms), polyamide 1010 composed of decamethylenediamine (a diamine having a carbon number of 10) and sebacic acid (a dicarboxylic acid having a carbon number of 10), Polyamide 1012 consisting of diamine) and dodecanedioic acid (carboxylic acid having 12 carbon atoms) is industrially available, can be an aliphatic polyamide resin having the above properties, and can be used as a resin composition. In this case, not only low water absorption and chemical resistance but also weld strength and weather resistance can be improved in a well-balanced manner, which is particularly preferred. Each of these aliphatic polyamide resins can be used alone, or two or more of them can be used in combination.

The mass ratio (A/B) of the polyarylate resin (A) and the aliphatic polyamide resin (B) must be 80/20 to 20/80, and can be 70/30 to 30/70. Preferably, it is more preferably 60/40 to 40/60. When the content of the polyarylate resin (A) exceeds 80% by mass, the resin composition has poor weather resistance and chemical resistance, and when it is less than 20% by mass, the heat resistance of the resin composition decreases. In addition, the water absorption rate increases, resulting in a decrease in mechanical strength and dimensional stability.

The resin composition of the present invention may contain resins other than the polyarylate resin (A) and the aliphatic polyamide resin (B) as resin components. Examples of other resins include, but are not limited to, polyester resins and polycarbonate resins. The content of other resins can be used within a range that does not impair the properties of the resin composition.

In the present invention, in addition to the polyarylate resin (A) and the aliphatic polyamide resin (B), the resin composition further contains the glass fiber (C) to further improve heat resistance and mechanical properties. can be done.

The form of the glass fiber (C) used in the present invention is not particularly limited, and any form such as roving, milled fiber and chopped strand can be used. Among them, chopped strands are preferably used because they have an excellent balance between mechanical strength and handling. When chopped strands are used as the glass fibers (C), the average fiber length before melt-kneading is preferably 1 to 5 mm, more preferably 2 to 4 mm. The cross-sectional shape of the glass fiber can be selected to be circular or flat. When the cross section is circular, the glass fiber preferably has an average fiber diameter of 20 to 40 μm, more preferably 20 to 30 μm. In the case of a flat shape, the average fiber diameter of the long diameter of the glass fibers is preferably 20 to 40 μm, more preferably 20 to 30 μm. The average fiber diameter of the shorter diameters in the cross section of the glass fibers is preferably 4 to 15 μm, more preferably 7 to 10 μm. The aspect ratio (ratio of fiber length to fiber diameter) of the glass fiber is preferably 250-500, more preferably 280-480, even more preferably 300-450. On the other hand, a milled fiber can also be used as the glass fiber (C) from the viewpoint of improving the weld strength of the resulting resin composition or its molded product. Milled fiber is obtained by pulverizing glass fiber to a length of about 10 to 500 μm. The milled fiber used in the present invention preferably has an average fiber length of 30 to 300 μm, more preferably 50 to 280 μm. Each of these glass fibers may be used alone, or two or more of them may be used in combination.

When the glass fiber (C) is contained, the content is preferably 20 to 70 parts by mass with respect to a total of 100 parts by mass of the polyarylate resin (A) and the aliphatic polyamide resin (B), and 25 to 70 parts by mass. It is more preferably 65 parts by mass, and even more preferably 30 to 60 parts by mass. If the content of the glass fiber (C) is less than 20 parts by mass, the effect of improving the mechanical strength becomes poor. On the other hand, if the content of the glass fiber (C) exceeds 70 parts by mass, the workability during melt-kneading may deteriorate, making it difficult to obtain pellets of the resin composition.

In general, when a resin composition containing glass fibers is molded by injection molding, when using a mold having multi-point gates, the molten resin flows into the mold from each gate. However, while the glass fibers in the molten resin are aligned in the flow direction, the glass fibers in the molten resin collide with each other at the part where each molten resin joins, and the direction of the glass fibers changes in the direction perpendicular to the flow. . As a result, there is a property that the strength in the shear direction (hereinafter referred to as "weld strength") in the vicinity of the resin merging portion of the obtained molded body is especially weakened. In order to evaluate the strength in the shear direction of the molded body, it is usually possible to judge by measuring the bending strength of the plate-shaped molded body. The resin composition of the present invention exhibits extremely little decrease in the weld strength even when it contains glass fibers.

If necessary, additives such as other fillers and stabilizers may be added to the resin composition of the present invention. These additives can be optionally added during melt kneading of the resin composition. Examples of additives include talc, swelling clay minerals, silica, alumina, glass beads, fillers such as graphite, pigments such as titanium oxide and carbon black, antioxidants, antistatic agents, flame retardants, and auxiliary flame retardants. is mentioned.

The production method for obtaining the resin composition of the present invention is not particularly limited, but melt-kneading using a twin-screw kneader is preferably used. The kneading temperature is preferably equal to or higher than the melting point (Tm) of the aliphatic polyamide resin (B), and preferably lower than (Tm+100°C). If the kneading temperature is lower than Tm, the kneader will be overloaded, and problems such as vent-up may occur. Also, if the kneading temperature is too high, the aliphatic polyamide resin (B) may be colored by heat. As a method for incorporating the glass fiber (C), a method of collectively mixing the polyarylate resin (A), the aliphatic polyamide resin (B) and the glass fiber (C) from the main hopper of the twin-screw kneader and melt-kneading them. However, in order to prevent the glass fibers from breaking and being shortened in the kneading process, a method of supplying the glass fibers (C) from the middle of the kneading process of the twin-screw kneader using a side feeder etc. It can be preferably used. Especially when milled fibers are used as the glass fibers (C), the average fiber length is short and the possibility of breakage is reduced. can be done. The method of collecting the obtained resin composition is not particularly limited, but considering the subsequent molding, after melt-kneading with a twin-screw kneader, it is pulled out in a strand shape, cooled and solidified, and pelletized to form a resin composition. It is preferable to obtain material pellets.

The resin composition of the present invention is particularly preferably used in molding applications, and molded articles can be obtained by ordinary molding methods. Examples of the molding method include injection molding, extrusion molding, blow molding, and sinter molding. Among them, the injection molding method is preferable because the mechanical properties and moldability can be sufficiently improved. Examples of injection molding machines include, but are not limited to, screw in-line injection molding machines and plunger injection molding machines. The resin composition heated and melted in the cylinder of the injection molding machine is weighed for each shot, injected into the mold in a molten state, cooled and solidified in a predetermined shape, and then removed from the mold as a molded product. be The resin temperature during injection molding is preferably Tm or more and less than (Tm+100° C.) of the resin composition. When molding the resin composition of the present invention, it is preferable to use sufficiently dried resin composition pellets. If the water content is large, the resin foams in the cylinder of the injection molding machine, making it difficult to obtain an optimal molded product. may decrease. The moisture content of the resin composition pellets used for injection molding is preferably less than 0.05% by mass, more preferably less than 0.03% by mass, based on 100% by mass of the resin composition. The mold temperature during injection molding must be kept below the glass transition temperature (Tg) of the polyarylate resin (A), preferably below (Tg-30°C), and below (Tg-50°C). is more preferable. If the mold temperature exceeds the Tg of the polyarylate resin (A), the resin composition is not sufficiently solidified when the molded product is released from the mold, and the molded product may be deformed. The mold temperature is the actual temperature of the mold split surface, and is adjusted using a mold temperature controller so that this part is within the above temperature range. A coolant may be circulated within the mold, if desired.

EXAMPLES The present invention will be specifically described below with reference to Examples, but the present invention is not limited to these. Physical properties were measured by the following methods.

1. Evaluation method Various evaluations were performed below. In addition, (1) is a resin composition pellet, (2) to (5), (7) for test piece 1 (width 10 mm, thickness 4 mm), (6) for test piece 2 (vertical 50 × horizontal 50 mm , thickness 2 mm). Test pieces 1 and 2 were obtained by molding the resin composition pellets obtained in each example at a resin temperature of 260°C and a mold temperature of 100°C using an injection molding machine (EC100 manufactured by Toshiba Corporation).
In particular, when a resin composition containing glass fibers was obtained in the examples, in addition to the evaluations of (1) to (6), (7) weld bending elongation at break was also evaluated.

(1) Inherent Viscosity Measured according to ISO1628-1. That is, the resin composition was dissolved in 1,1,2,2-tetrachloroethane to a concentration of 1 g/dl. Using an Ubbelohde viscometer, the drop time of the sample solution and solvent was measured at a temperature of 25° C., and the inherent viscosity was determined using the following formula. For the resin composition, measurement was performed after vacuum drying at 150° C. for 24 hours.
Inherent viscosity (dl/g) = ln [(dropping time of sample solution/dropping time of solvent only)/resin concentration (g/dl)]

(2) Tensile strength A tensile test was performed according to ISO 527-1.

(3) Deflection temperature under load Measured at a load of 1.8 MPa according to ISO 75-1. The higher the deflection temperature under load, the better the heat resistance.

(4) Water Absorption According to ISO 62, (Condition 1) 23°C, 50% RH atmosphere, left for about 1 month until equilibrium moisture content is reached, (Condition 2) 23°C, immersion in water for 24 hours. Water absorption was measured. In (Condition 1), those exceeding 0.6% were judged to have high water absorption. In (Condition 2), those exceeding 0.35% were judged to have high water absorption.

(5) Long-Term Weather Resistance Using the obtained test piece, an exposure test was performed using a rotary xenon weather resistance tester (xenon weatherometer Ci4000 manufactured by Toyo Seiki Seisakusho Co., Ltd.). The test conditions were a black panel temperature of 83° C., a humidity of 20% RH, a rainfall cycle of 18 minutes/100 minutes, an irradiation intensity of 60 W/m ² and an irradiation time of 2000 hours. The same tensile test as in (2) Tensile strength was performed on the exposed test piece, and the tensile strength retention rate was calculated according to the following formula. It is judged that the higher the tensile strength retention, the better the long-term weather resistance.
Tensile strength retention (%) = (tensile strength after exposure treatment) / (tensile strength without exposure) x 100

(6) Chemical resistance Using the obtained test piece, household alkaline synthetic detergent (Magiclin, surfactant; 1% alkylamine oxide, manufactured by Kao Corporation), oil film remover (Cleanview, manufactured by Ichinen Chemical Co., Ltd.), wax An immersion test was performed at a temperature of 23° C. for 24 hours for each remover (manufactured by Karcher, pH=13-14). After the test, the surface of the test piece was visually observed and evaluated according to the following criteria.
○: No change △: Partial whitening ×: Completely whitening

(7) Weld bending elongation at break A bending test was performed according to ISO 178. As test pieces, two types of test pieces were prepared: a test piece (i) without a weld, in which resin was introduced from one end of the mold, and a test piece (ii), in which resin was applied from both ends of the mold and had a weld. Elongation was measured.
The smaller the difference between the bending elongation at break of the test piece (i) without a weld and the bending elongation at break of the test piece (ii) with a weld, the better the weld properties.

2. Raw Materials Raw materials used in Examples and Comparative Examples are shown below.
(1) Polyarylate resin In a reaction vessel equipped with a water-cooling jacket and a stirring device, 3.1 parts by mass of sodium hydroxide is dissolved in ion-exchanged water, and then 2,2-bis(4-hydroxyphenyl)propane ( BPA) 8.3 parts by mass and p-tert-butylphenol (PTBP) 0.29 parts by mass were dissolved. In another container, 3.8 parts by mass of terephthalic acid dichloride (TPC) and 3.8 parts by mass of isophthalic acid dichloride (IPC) were dissolved in dichloromethane (BPA:TPC:IPC:PTBP:NaOH=100:51:51:5 : 213 (molar ratio)). After adjusting each liquid to 20° C., 0.09 parts by mass of a 50% aqueous solution of benzyltrimethylammonium chloride was added to the aqueous solution stirred in a reaction vessel, and the entire amount of the dichloromethane solution was added, After continuing stirring for 6 hours, the stirrer was stopped. After separation by standing, the aqueous phase was extracted, and 0.25 parts by mass of acetic acid was added to the remaining dichloromethane phase. Then, ion-exchanged water was added, and after stirring for 20 minutes, the mixture was allowed to stand again, and the aqueous phase was extracted. After repeating this water washing operation until the aqueous phase became neutral, the dichloromethane phase was poured into warm water at 50°C in a vessel equipped with a homomixer to evaporate the methylene chloride to obtain a powdery polyarylate. . After dehydrating the powdery polyarylate, it was dried under reduced pressure at 120° C. for 24 hours using a vacuum dryer to obtain a polyarylate resin (A-1). This resin had an inherent viscosity of 0.53 dL/g and a carboxyl value of 15 equivalents/ton. No crystalline melting peak was observed when measured using DSC.

(2) Polyamide resin (B-1) PA612 (Rilsan DMVO F manufactured by Arkema, melting point 215° C.)

(B-2) PA610 (Rilsan SMVO F manufactured by Arkema, melting point 222° C.)

(B-3) PA1010 (RilsanTMNO F manufactured by Arkema, melting point 202°C)

(B-4) PA1012 (Hiprolon 400NN manufactured by Arkema, melting point 190°C)

(B-5) PA6 (A1030BRL manufactured by Unitika Ltd., melting point 225°C)

(B-6) PA66 (E2000 manufactured by Unitika, melting point 265°C)

(B-7) Semi-aromatic amorphous polyamide resin (Rilsan Clear G170 manufactured by Arkema)

(B-8) Alicyclic amorphous polyamide resin (Rilsan Clear G850 Rnew manufactured by Arkema)

(3) Glass fiber (C-1) chopped strand (T-289 manufactured by Nippon Electric Glass Co., Ltd., average fiber diameter 13 μm, average fiber length 3 mm)

(C-2) Milled fiber (EPH80M-10A manufactured by Nippon Electric Glass Co., Ltd., average fiber length 80 μm)

Example 1
50 parts by mass of polyarylate resin (A-1) and 50 parts by mass of polyamide resin (B-1) were collectively mixed, and supplied from the base of a twin-screw extruder (TEM26-SS manufactured by Toshiba Machine Co., Ltd., screw diameter 26 mm). , a resin temperature of 270° C., and a screw rotation of 250 rpm. The kneaded resin composition was taken out from a die in the form of a strand, cooled and solidified in a water tank, and cut with a pelletizer to obtain resin composition pellets.
Various evaluations were performed using the obtained resin composition. Table 1 shows the results.

Examples 2-8
Using the types and contents of the polyarylate resin and the polyamide resin shown in Table 1, the same operation as in Example 1 was performed to obtain a resin composition, and various evaluations were performed. Table 1 shows the results.

Example 9
50 parts by mass of polyarylate resin (A-1) and 50 parts by mass of polyamide resin (B-1) were collectively mixed, and supplied from the base of a twin-screw extruder (TEM26-SS manufactured by Toshiba Machine Co., Ltd., screw diameter 26 mm). 43 parts by mass of the glass fiber (C) was supplied from a side feeder on the way, and melted and kneaded at a resin temperature of 270°C and a screw rotation of 250 rpm. The kneaded resin composition was taken out from a die in the form of a strand, cooled and solidified in a water tank, and cut with a pelletizer to obtain resin composition pellets.
Various evaluations were performed using the obtained resin composition. Table 2 shows the results.

Examples 10-23
Using the types and contents of polyarylate resin, polyamide resin, and glass fiber shown in Table 2, the same operation as in Example 9 was performed to obtain a resin composition, and various evaluations were performed. Table 2 shows the results.

Comparative Examples 1-7
Using the types and contents of the polyarylate resin, polyamide resin and glass fiber shown in Table 3, the same operation as in Example 1 or 9 was performed to obtain a resin composition, and various evaluations were performed. Table 3 shows the results.

Since the resin compositions of Examples 1 to 8 used predetermined polyarylate resins and aliphatic polyamide resins, they had low water absorption and excellent weather resistance and chemical resistance. The resin compositions of Examples 9 to 23 used predetermined polyarylate resins and aliphatic polyamide resins, and further contained glass fibers, so that they had low water absorption, excellent weather resistance, chemical resistance, and excellent weld strength. .

In Comparative Example 1, since the content of the aliphatic polyamide resin was less than the lower limit, the weather resistance and chemical resistance were poor.

In Comparative Example 2, since the content of the polyarylate resin was less than the lower limit, the heat resistance was poor and the water absorption was high.

In Comparative Examples 3 and 4, weather resistance was poor because the predetermined aliphatic polyamide resin was not used. Moreover, the water absorption rate was also high.

In Comparative Examples 5 and 6, the chemical resistance was poor because the predetermined aliphatic polyamide resin was not used.

In Comparative Example 7, weather resistance was poor because the predetermined aliphatic polyamide resin was not used.

Claims (6)

A resin composition containing a polyarylate resin (A) and an aliphatic polyamide resin (B),
The melting point of the aliphatic polyamide resin (B) is less than 225° C., and the mass ratio (A/B) of the polyarylate resin (A) and the aliphatic polyamide resin (B) is 80/20 to 20/80.the law of nature,
Further containing 20 to 100 parts by mass of glass fiber (C) with respect to a total of 100 parts by mass of polyarylate resin (A) and aliphatic polyamide resin (B),
The aliphatic polyamide resin (B) is one or more selected from polyamide 612, polyamide 610, polyamide 1010, polyamide 1012, polyamide 11, and polyamide 12. resin composition. The resin composition according to claim 1, containing 20 to 70 parts by mass of the glass fiber (C). 3. The resin composition according to claim 1, wherein the aliphatic diamine component constituting the aliphatic polyamide resin (B) is one or more selected from hexamethylenediamine and decamethylenediamine. The resin composition according to any one of claims 1 to 3, wherein the aliphatic dicarboxylic acid component constituting the aliphatic polyamide resin (B) is one or more selected from sebacic acid and dodecanedioic acid. The resin composition according to any one of claims 1 to 4, wherein the aliphatic polyamide resin (B) is one or more selected from polyamide 612, polyamide 610, polyamide 1010 and polyamide 1012. A molded article obtained by molding the resin composition according to any one of claims 1 to 5.