JPH0790178A - Polyamide resin composition - Google Patents

Abstract

PURPOSE:To provide a polyamide molding material excellent in mechanical properties such as bending strength even at high temperatures as well as at ordinary temperatures and also excellent in moldability and heat resistance. CONSTITUTION:The title composition comprises 95-25 pts.wt. crystalline aromatic polyamide resin (A) of a heat of fusion of 3cal/g or above comprising dicarboxylic acid units comprising 30-100mol% terephthalic acid units, and 0-40mol% aromatic dicarboxylic acid units other than terephthalic acid units and/or 0-70mol% aliphatic dicarboxylic acid units (the total of the dicarboxylic acid units is 100mol%) and aliphatic alkylenediamine units and/or alicyclic alkylenediamine units, 5-75 pts.wt. amorphous or lowly crystalline polyamide resin (B) of a heat of fusion of 1cal/g or below and 5-200 pts.wt., per 100 pts.wt. total of components A and B, inorganic fibers (C).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel thermoplastic resin composition which can be used as a molded product, a sheet or the like by injection molding, extrusion molding or the like. More specifically, the present invention relates to a polyamide resin composition having not only high flexural strength, impact strength, etc. at room temperature, but also capable of retaining such mechanical properties even at high temperatures, having excellent heat resistance and good moldability. .

[0002]

2. Description of the Related Art Crystalline polyamide resins are excellent in heat resistance, mechanical properties and low water absorption, so that various molded products,
It is used as a molding material for sheets. Inorganic fibers may be mixed with such a molding material in order to further improve heat resistance. However, the system in which the crystalline aromatic polyamide resin is mixed with the inorganic fiber has a drawback that the moldability is significantly deteriorated because the melting point and the glass transition temperature of the resin are high.

On the other hand, a non-crystalline or low crystalline polyamide resin also has excellent mechanical properties, low water absorption and moldability. However, even if the inorganic fibers are mixed in order to improve mechanical properties such as heat resistance and bending strength, the degree of the improvement is slight as compared with the crystalline resin, and especially in a temperature atmosphere near the glass transition temperature. On the contrary, it has the drawback of being accompanied by a marked deterioration in mechanical properties.

[0004]

In order to overcome such drawbacks, it has been proposed to mix a crystalline aromatic polyamide resin, a linear aliphatic polyamide resin (crystalline polyamide resin) and an inorganic fiber (special characteristics). Kaisho 62-57458
issue). However, even when the linear aliphatic polyamide resin is used, the moldability is improved, but the improvement in mechanical properties at high temperature is still insufficient.

[0005]

[Means for Solving the Problems] The inventors of the present invention not only have bending strength and impact strength at room temperature, but also retain such mechanical properties at high temperature and are excellent in heat resistance and molding processability. As a result of developing a new polyamide resin molding material and conducting intensive studies to solve the above problems in the prior art, a composition in which a specific crystalline aromatic polyamide resin and an amorphous or low crystalline polyamide resin are blended in a fixed ratio It has been found that such an object can be achieved by adding a certain amount of inorganic fiber to, and the present invention has been accomplished.

That is, the gist of the present invention is that (A) 30 to 100 mol% of terephthalic acid units and 0 to 40 mol% of aromatic dicarboxylic acid units other than terephthalic acid units and / or 0 to 70 mol of aliphatic dicarboxylic acid units. % Dicarboxylic acid unit (a) (provided that the total of dicarboxylic acid units is 100
Mol%. ) And an aliphatic alkylenediamine unit and / or an alicyclic alkylenediamine unit (b), a crystalline aromatic polyamide resin having a heat of fusion of 3 cal / g or more: 95 to 25 parts by weight, (B) a heat of fusion of 1 cal / g or less non-crystalline or low crystalline polyamide resin: 5 to 75 parts by weight, (C) inorganic fiber: 5 to 200 parts by weight per 100 parts by weight of the total of the polyamide resins (A) and (B), And a polyamide resin composition comprising:

The present invention will be described in detail below. The aromatic polyamide (A) used in the present invention comprises a dicarboxylic acid unit (a) containing a terephthalic acid component unit as a main component unit,
It is composed of an alkylenediamine unit (b).
The aromatic polyamide (A) has an intrinsic viscosity [η] measured in concentrated sulfuric acid at a temperature of 25 ° C. of usually 0.5 to 4.0 dl.
/ G, preferably in the range of 0.8 to 3.0 dl / g.

The dicarboxylic acid unit (a) may contain other aromatic dicarboxylic acid units and / or aliphatic dicarboxylic acid units in addition to the terephthalic acid unit. Specific examples of other aromatic dicarboxylic acid units include component units derived from isophthalic acid, phthalic acid, 2-methylterephthalic acid, naphthalene dicarboxylic acid, and the like. Among these, isophthalic acid units or naphthalene dicarboxylic acid units are included. Acid units are preferred, especially isophthalic acid units.

The dicarboxylic acid unit (a) includes, in addition to the above-mentioned terephthalic acid unit and other aromatic dicarboxylic acid units and / or aliphatic dicarboxylic acid units,
A small amount of a component unit derived from a tribasic or higher polyvalent carboxylic acid such as trimellitic acid or pyromellitic acid may be contained. The dicarboxylic acid unit (a) constituting the aromatic polyamide (A) includes all dicarboxylic acid component units 10
In 0 mol, the terephthalic acid unit is usually contained in an amount of 30 to 100 mol%, and the dicarboxylic acid unit other than the terephthalic acid unit is usually contained in an amount of 0 to 40 mol%. The aliphatic dicarboxylic acid unit is usually 0 to 70 mol% together with the aromatic dicarboxylic acid unit other than the terephthalic acid unit or in place of the aromatic dicarboxylic acid unit other than the terephthalic acid unit.
Included in the amount of.

The aromatic polyamide (A) used in the present invention is composed of such a dicarboxylic acid unit (a) and an aliphatic alkylenediamine unit and / or an alicyclic alkylenediamine unit (b). Among the aliphatic alkylenediamine units, a linear or branched alkylenediamine unit having 4 to 25 carbon atoms is preferable, and a linear or branched chain alkylenediamine unit having 6 to 18 carbon atoms is more preferable. A chain alkylenediamine unit having is preferred.

Specific examples of such an aliphatic diamine unit include 1,6-diaminohexane, 1,7-diaminoheptane, 1,8-diaminooctane, 1,9-diaminononane, 1, Component units derived from linear alkylenediamines such as 10-diaminodecane, 1,11-diaminoundecane, and 1,12-diaminododecane;

And 1,4-diamino-1,1-dimethylbutane, 1,4-diamino-1-ethylbutane,
1,4-diamino-1,2-dimethylbutane, 1,4-
Diamino-1,3-dimethylbutane, 1,4-diamino-1,4-dimethylbutane, 1,4-diamino-2,3
-Dimethylbutane, 1,2-diamino-1-butylethane, 1,6-diamino-2,5-dimethylhexane,
1,6-diamino-2,4-dimethylhexane, 1,6
-Diamino-3,3-dimethylhexane, 1,6-diamino-2,2-dimethylhexane, 1,6-diamino-
2,2,4-trimethylhexane, 1,6-diamino-
2,4,4-trimethylhexane, 1,7-diamino-
2,3-dimethylheptane, 1,7-diamino-2,4
-Dimethylheptane, 1,7-diamino-2,5-dimethylheptane, 1,7-diamino-2,2-dimethylheptane, 1,8-diamino-1,3-dimethyloctane, 1,8-diamino-1 , 4-dimethyloctane,
1,8-diamino-2,4-dimethyloctane, 1,8
-Diamino-3,4-dimethyloctane, 1,8-diamino-4,5-dimethyloctane, 1,8-diamino-
2,2-dimethyloctane, 1,8-diamino-3,3
-Chained alkylenediamines having branches such as dimethyloctane, 1,8-diamino-4,4-dimethyloctane, 1,6-diamino-2,4-diethylhexane and 1,9-diamino-5-methylnonane The component units derived from can be mentioned.

Among such linear or branched chain alkylenediamine units, linear alkylenediamine units are preferred, and 1,6-diaminohexane, 1,8-diaminooctane, 1 , 10-diaminodecane, 1,12-diaminododecane, and other linear alkylenediamines are preferred, and component units derived from one or more compounds are more preferred, and more preferred is 1,10-diaminodecane. Derived component units are preferred.

The alicyclic diamine unit is usually a component unit having about 6 to 25 carbon atoms and derived from a diamine containing at least one alicyclic hydrocarbon ring. Specific examples of such alicyclic diamine units include 1,3-diaminocyclohexane, 1,
4-diaminocyclohexane, 1,3-bis (aminomethyl) cyclohexane, 1,4-bis (aminomethyl)
Cyclohexane, isophoronediamine, piperazine,
2,5-dimethylpiperazine, bis (4-aminocyclohexyl) methane, bis (4-aminocyclohexyl)
Propane, 4,4'-diamino-3,3'-dimethyldicyclohexylpropane, 4,4'-diamino-3,
3'-Dimethyldicyclohexylmethane, 4,4'-diamino-3,3'-dimethyl-5,5'-dimethyldicyclohexylmethane, 4,4'-diamino-3,3'-
Dimethyl-5,5'-dimethyldicyclohexylpropane, α-α'-bis (4-aminocyclohexyl) -p
-Diisopropylbenzene, α-α'-bis (4-aminocyclohexyl) -m-diisopropylbenzene, α
-Α'-bis (4-aminocyclohexyl) -1,4-
Component units derived from alicyclic diamines such as cyclohexane and α-α′-bis (4-aminocyclohexyl) -1,3-cyclohexane can be mentioned.

Among these alicyclic diamine units,
Bis (aminomethyl) cyclohexane, bis (4-aminocyclohexyl) methane, 4,4'-diamino-3,
3'-Dimethyldicyclohexylmethane is preferred, especially bis (4-aminocyclohexyl) methane, 1,3-
Component units derived from alicyclic diamines such as bis (aminocyclohexyl) methane and 1,3-bis (aminomethyl) cyclohexane are preferred.

The aromatic polyamide (A) as described above is
It can be manufactured by various conventionally known methods. For example, a solution method in which an aromatic dicarboxylic acid is converted into a halide and polycondensed with a linear aliphatic alkylenediamine in a uniform solution, a halide of an aromatic dicarboxylic acid dissolved in a polar solvent and a linear fatty acid dissolved in a nonpolar solvent The aromatic polyamide (A) can be produced by an interfacial method such as condensation with a group alkylenediamine at the interface. Further, the aromatic polyamide (A) as described above can also be produced by a melt polymerization method or a solid phase polymerization method.

The crystalline aromatic polyamide resin (A) of the present invention must exhibit sufficiently high crystallinity, and as a guideline, the heat of fusion is 3 cal / g or more, preferably 5 cal / g or more. Is required. When the crystallinity is insufficient, mechanical properties such as bending strength are deteriorated, which is not preferable. The amorphous or low crystalline polyamide resin (B) used in the present invention has an amide bond (—CO—NH—) bond in the polymer chain and has a heat of fusion of 1 ca.
It is a non-crystalline or low-crystalline resin of 1 / g or less.
The term "amorphous" generally means that the material does not have a definite melting point or measurable heat of fusion, but includes some that show some crystallinity when slowly cooled. That is, in the present invention, the term "non-crystalline or low-crystalline" means that the material exhibits crystallinity within a range that does not significantly impair the effects of the present invention, but the heat of fusion thereof is 1 cal / g or less. It is limited.

The polyamide resin (B) has a glass transition temperature of preferably 90 ° C. or higher and 250 ° C. or lower, more preferably 90 ° C. or higher and 210 ° C. or lower, and further preferably 100 ° C. or higher and 180 ° C. or lower. Is. The glass transition temperature, melting point, and heat of fusion in the present invention can be measured by using a differential scanning calorimeter usually used for crystalline polyamide. PE as an example
There is DSC-II manufactured by RKIN-ELMER. Using this device, for example, the heat of fusion can be measured at a temperature rising rate of 10 ° C. per minute. The sample is heated to a temperature above the expected melting point, then the sample is cooled at a rate of 10 ° C per minute, cooled to 30 ° C, left for about 1 minute and then heated at a rate of 10 ° C per minute. It can be measured by As the heat of fusion, the one that has a constant value within the experimental error range is adopted regardless of the temperature rising and cooling cycles after the beginning.

According to this method, commercially available nylon-
The heat of fusion of 6 is 16 cal / g. In the polyamide resin (B) of the present invention, preferably, the amide bond constituent unit is mainly selected from the structural formulas (I) to (VI) below, and the heat of fusion is selected within the above range.

(I) -HN-W-NH- (W is at least one selected from linear or branched aliphatic groups having 2 to 12 carbon atoms) (II) -HN-X-NH- (X Is a metaxylylene group, or at least one selected from aliphatic groups having 5 to 22 carbon atoms and containing at least one alicyclic hydrocarbon skeleton)

[0021]

[Chemical 1]

(R independently represents hydrogen or carbon number 1
Is at least one selected from aliphatic groups in the range of to 6 and each R may be the same or different)

[0023]

[Chemical 2]

(R is independently hydrogen or a carbon number of 1
A group selected from aliphatic groups in the range of to 6 and each R may be the same or different)

(V) -CO-Y-CO- (Y is at least one selected from an aliphatic group having 2 to 22 carbon atoms and an aliphatic group containing an alicyclic hydrocarbon group) (VI) -CO -Z-NH- (Z is at least one selected from an aliphatic group and an aromatic group having 4 to 14 carbon atoms)

Specific examples of W in the structural unit (I) include a butylene group, a hexylene group, an octylene group,
Decanylene group, 2,2,4-trimethylhexylene group,
A 2,4,4-trimethylhexylene group, a 3-methylhexylene group, a pentylene group may be mentioned, and more preferably a butylene group, a hexylene group, a 2,4,4-trimethylhexylene group, 2,2,4- It is a trimethylhexylene group.

Specific examples of X in the above structural unit (II) include a metaxylylene group (Xa), a 4,4'-methylenedicyclohexane-1,1'-diyl group (Xb),
2,2'-dimethyl-4,4'-methylenedicyclohexane-1,1'-diyl group (Xc), 1,5,5-trimethylcyclohexylene-1-methylene group (Xd), cyclohexylene-1, 4-dimethylene group (Xe), 4-
Methylenecyclohexylene group (Xf), 3-methylenecyclohexylene group (Xg), cyclohexylene-1,3
-A dimethylene group (Xh) and the like. Structural formulas of specific examples of each X are shown below.

[0028]

[Chemical 3]

R in the structural units (III) and (IV)
Specific examples of include a hydrogen atom, a methyl group, a tertiary butyl group, an isopropyl group and an ethyl group, more preferably a hydrogen atom and a methyl group, and further preferably a hydrogen atom. Specific examples of Y in the structural unit (V) include ethylene group, propylene group, butylene group, hexylene group, octylene group, decanylene group, 1,4-cyclohexylene group, 1,3-cyclohexylene group, structural unit ( (Xa), (Xb), (Xc) and (X
d), (Xe), (Xf), (Xg), (Xh) and the like, and more preferably ethylene group, propylene group, butylene group, octylene group, 1,4-cyclohexylene group, 1,3-. It is a cyclohexylene group, more preferably an ethylene group, a propylene group or a butylene group.

Specific examples of Z in the structural unit (VI) include a butylene group, a pentylene group, a hexylene group, a decanylene group, an undecanylene group and a paraphenylene group, and more preferably a pentylene group, a hexylene group and an undecanylene group. And more preferably a pentylene group. Specific preferred examples of the polyamide resin (B) are shown below.

[0031]

[Chemical 4]

Relative viscosity of the polyamide resin (B) (concentration 1 g / dl in 98% concentrated sulfuric acid, measurement temperature 25 ° C.)
Is preferably 1.0 to 5.0 dl / g, more preferably 1.4 to 3.5 dl / g, and further preferably 1.6 to 3.0 dl / g. Methods for producing these non-crystalline or low-crystalline polyamide resins are known, for example, JP-A-58-38751 and JP-A-60-2.
Those disclosed in Japanese Patent No. 17237, Japanese Patent Laid-Open No. 60-219227, etc. are applicable.

Specific examples of the inorganic fiber (C) used in the present invention include fibrous inorganic compounds such as glass fiber, carbon fiber, boron fiber, ceramic fiber, asbestos fiber and stainless steel fiber. . Among these inorganic fibers (C), glass fibers are preferably used. These inorganic fibers may be used as a mixture of two or more kinds. Further, these inorganic fibers can be treated with a silane coupling agent or a titanium coupling agent before use.

The inorganic fiber (C) used in the present invention has a diameter of 5 to 15 μm, preferably 6 to 14 μm, and a length of preferably 2 to 10 mm, particularly preferably 3 to 6 mm.
Is. In the present invention, the blending ratio of the components (A) and (B) is as follows, when the total weight of (A) and (B) is 100 parts by weight.

Component (A): 95 to 25 parts by weight, preferably 90 to 45 parts by weight, more preferably 80 to 55 parts by weight. If it exceeds 95 parts by weight, the fluidity will decrease to 25
If the amount is less than parts by weight, the heat resistance effect intended by the present invention cannot be obtained. Component (B): 5-75 parts by weight, preferably 10-55 parts by weight, more preferably 20-45 parts by weight. If it is less than 5 parts by weight, the fluidity is poor, and if it exceeds 75 parts by weight, the heat resistance effect intended by the present invention cannot be obtained.

The mixing ratio of the component (C) is as follows based on 100 parts by weight of the total weight of the components (A) and (B). Component (C): 5 to 200 parts by weight, preferably 20 to 17
It is 0 part by weight, more preferably 70 to 140 parts by weight.
If it is less than 5 parts by weight, the heat resistance and mechanical properties intended by the present invention cannot be obtained, and if it exceeds 200 parts by weight, fluidity is lowered, which is not preferable.

The composition according to the present invention contains a thermoplastic or thermosetting resin other than the above polymer component, a rubber component, an antioxidant, a weather resistance improver, if necessary, within a range not impairing the object of the present invention. Further, components such as a nucleating agent, a slip agent, a flame retardant, various colorants, an antistatic agent and a release agent can be added. In the present invention, the compounding method of the crystalline aromatic polyamide resin (A), the amorphous or low crystalline polyamide resin (B), and the inorganic fiber (C) is not particularly limited,
A known melt-kneading method can be used. An extruder, a kneader, a roll or the like can be used as the melt-kneading device.

In a special case, all the components may be directly supplied to various molding machines and kneaded by the molding machines for molding.
In addition, a filler or other components are kneaded in advance (with various additives as necessary) to a high concentration to form a masterbatch, which is then separately blended with another polymer or the like for blend compounding or molding. However, the order of addition of each component during melt-kneading is not particularly limited.

That is, the components (A), (B) and (C)
Is added at once and melt-kneaded at the same time, components (A) and (B) are melt-kneaded in advance, and then component (C) is additionally added and melt-kneaded, components (A), (B) and (C). 2) any of the two components may be melt-kneaded in advance, and then the remaining 1 component may be additionally kneaded. The kneaded resin composition is molded by various molding methods such as injection molding and is used as various injection molded products, extrusion molded products, sheets, tubes, films, fibers, laminates and coating materials.

The molded product obtained from the thermoplastic resin composition of the present invention is suitably used for automobile parts, electric / electronic parts, mechanical parts and the like. Molded parts for automobile parts include exterior parts such as bumpers, fenders, aprons, hood panels, fascias, locar panels, rocker panel reinforcements, floor panels, rear quarter panels, door panels, door supports, roof tops, trunk lids, fuel lids, etc. , Instrument panels, console boxes, glove boxes, shift knobs, pillar garnishes, door trims, handles, seamless parts, wind louvers, headrests, seat belts, interior parts such as seats, distributor caps, air cleaners, radiator tanks, battery cases, radiators. Engine room parts such as shrouds, washer tanks, cooling fans, heater cases, tire peripheral parts such as roll flat supports, Mirror Body, wheel cover, trunk mat, gasoline tanks and the like.

Further, it is used as a motorcycle component such as a cowling material, a muffler cover, and a leg shield.
Further, it is used as an electric and electronic component for a housing, a chassis, a connector, a printed circuit board, a pulley, and other components required to have strength and heat resistance.

[0042]

EXAMPLES The present invention will be described below with reference to examples, but these are merely examples and the present invention is not limited thereto. The test method in the examples was carried out by the following method. (1) Bending strength at 23 ° C. Measured in accordance with ASTM-D-790.

(2) Bending Strength at 100 ° C. The test piece was left in an atmosphere of 100 ° C. for 2 hours and then tested in an atmosphere of 100 ° C. according to ASTM-D-790. (3) Izod impact strength It was carried out according to ASTM-D-256. However, the test piece had a thickness of 1.27 mm and was notched.

(4) Injection pressure Using an injection molding machine (J75ED, manufactured by Japan Steel Works, Ltd.), the cylinder temperature is 320 ° C., the mold temperature is 100 ° C., the injection speed is 75%, and the injection time is 15 seconds. Specimens (tensile, flexural, 1/2 inch and 1 /
The minimum filling pressure at the time of molding a molded article of an 8-inch IZOd test piece) was shown.

Example 1 Polyamide 6T / 6I (polyamide resin consisting of aromatic dicarboxylic acid obtained by adding a small amount of isophthalic acid to terephthalic acid and hexamethylenediamine) as crystalline aromatic polyamide resin (A-1) (Mitsui Petrochemical Industrial Co., Ltd., trade name: Aren A3000, heat of fusion 9.3 cal / g)
37 parts by weight, amorphous polyamide (B-1) (manufactured by Mitsubishi Kasei Co., Ltd., trade name: Novamid X21.F07 (consisting of aromatic dicarboxylic acid consisting of isophthalic acid and a small amount of terephthalic acid and hexamethylenediamine) (Polyamide resin), relative viscosity = 2.3, Novamid is a registered trademark;
The melting point of this product was slowly measured by DSC, but no clear melting point appeared. ) 13 parts by weight was charged from the first hopper of a continuous twin-screw extruder (TEX30HCT, manufactured by Japan Steel Works, Ltd.), and glass fiber (C) from the second hopper provided between the first hopper and the vent hole. -1) (Nippon Electric Glass Co., Ltd., trade name: ECS03T-289H /
P) 50 parts by weight was charged using a quantitative feeder.

The cylinder temperature was set at 320 ° C., and the pellets were formed by melt-kneading at a screw rotation speed of 250 rpm. This is an injection molding machine (J75 manufactured by Japan Steel Works, Ltd.)
ED) Cylinder temperature 320 ℃, mold temperature 100
Physical properties were measured after molding a test piece (basic physical property piece) under the conditions of ° C, an injection speed of 75%, and an injection time of 15 seconds.
Also, the minimum filling pressure was determined during the molding to evaluate the fluidity. The results are shown in Table 1.

Example 2 The crystalline aromatic polyamide resin (A-
1) 37 parts by weight of amorphous polyamide resin (B-1) 1
What was set to 3 parts by weight was 30 parts by weight of the crystalline aromatic polyamide resin (A-1) and the amorphous polyamide resin (B-
1) The procedure of Example 1 was repeated except that the amount was changed to 20 parts by weight.

Comparative Example 1 In Example 1, the crystalline aromatic polyamide resin (A-
1) The crystalline aromatic polyamide resin (A- was used instead of 37 parts by weight and the amorphous polyamide resin (B-1).
The same procedure as in Example 1 was carried out except that only 1) was changed to 50 parts by weight.

Comparative Example 2 The crystalline aromatic polyamide resin (A-
1) 37 parts by weight of amorphous polyamide resin (B-1) 1
Example 1 except that only 3 parts by weight of crystalline aromatic polyamide resin (B-1) was used instead of 3 parts by weight.
It carried out similarly to.

Comparative Example 3 The amorphous polyamide resin (B-1) 1 in Example 1
3 parts by weight of crystalline aliphatic polyamide resin (nylon 6
6 resin: manufactured by DuPont, Zytel FE3218, relative viscosity 2.83, heat of fusion 16 cal / g) 13 parts by weight was replaced by the same procedure as in Example 1.

Example 3 The crystalline aromatic polyamide resin (A-
1) 37 parts by weight of crystalline aromatic polyamide resin (A-
2) Polyamide 6T / 6.6 (polyamide resin consisting of terephthalic acid, adipic acid and hexamethylenediamine) (Mitsui Petrochemical Co., Ltd., trade name: Aren C2000, heat of fusion 10.8 cal / g) 37 weight Example 1 was carried out in the same manner as in Example 1 except that parts were changed.

Comparative Example 4 In Example 3, the crystalline aromatic polyamide resin (A-
2) 37 parts by weight and the amorphous polyamide resin (B-1) were used instead of the crystalline aromatic polyamide resin (A-
The same procedure as in Example 1 was carried out except that only 2) was changed to 50 parts by weight.

Example 4 The crystalline aromatic polyamide resin (A-
2) 37 parts by weight of amorphous polyamide resin (B-1) 1
The crystalline aromatic polyamide resin (A-2) 30 was used in which 3 parts by weight and 50 parts by weight of the inorganic fiber (C-1) were blended.
Example 3 was carried out in the same manner as in Example 3 except that the mixing ratio of 10 parts by weight of the non-crystalline polyamide resin (B-1) and 60 parts by weight of the glass fiber (C-1) was changed.

Comparative Example 5 In Example 4, the crystalline aromatic polyamide resin (A-
2) 30 parts by weight of amorphous polyamide resin (B-1) 1
Example 3 except that only 0 parts by weight of crystalline aromatic polyamide resin (A-2) was used instead of 0 parts by weight.
It carried out similarly to.

As shown in Comparative Examples 1 and 2, if the crystalline aromatic polyamide resin and the inorganic fiber alone are used, the fluidity is lowered and the moldability is deteriorated, and only the amorphous polyamide resin and the inorganic fiber are used. Bending strength at room temperature and high temperature decreases.
That is, only when the crystalline aromatic polyamide resin, the non-crystalline polyamide resin and the inorganic fiber are used in combination at a constant ratio,
As shown in Examples 1 and 2, the fluidity and the bending strength at normal temperature and high temperature are improved.

Further, as shown in Example 1 and Comparative Example 3,
When the amorphous polyamide resin is changed to the crystalline aliphatic polyamide resin, the high temperature bending strength is lowered. As shown in Example 3 and Comparative Example 4, the combined use of the crystalline aromatic polyamide resin, the amorphous polyamide resin and the inorganic fiber improves the bending strength and the fluidity regardless of the type of the crystalline aromatic polyamide resin. You can see that it has the effect of doing.

As shown in Example 4 and Comparative Example 5, it can be seen that even if the inorganic fiber ratio is changed within the range of the present invention, the bending strength and fluidity are improved.

[0058]

[Table 1]

[0059]

The resin composition of the present invention is excellent not only in mechanical properties such as bending strength and impact strength at room temperature, but also in heat resistance which retains mechanical properties such as bending strength at high temperature.
Moreover, the moldability is good.

Claims (1)

[Claims] 1. (A) 30 to 100 mol% of terephthalic acid units and 0 to 40 mol% of aromatic dicarboxylic acid units other than terephthalic acid units and / or 0 to aliphatic dicarboxylic acid units.
Dicarboxylic acid unit (a) consisting of 70 mol% (provided that
The total of dicarboxylic acid units is 100 mol%. )When,
Heat of fusion 3cal / g consisting of aliphatic alkylenediamine unit and / or alicyclic alkylenediamine unit (b)
The above crystalline aromatic polyamide resin: 95 to 25 parts by weight, (B) the amorphous or low crystalline polyamide resin having a heat of fusion of 1 cal / g or less: 5 to 75 parts by weight, (C) the inorganic fiber: the above polyamide resin 5 to 200 per 100 parts by weight of the total of (A) and the polyamide resin (B)
And a polyamide resin composition.