JPH08311311A - Aromatic polyester composition - Google Patents

Abstract

PURPOSE: To obtain the subject composition melt moldable at 400 deg.C or lower and capable of giving molded products excellent in fluidity, heat resistance, and mechanical properties, by blending a specific copolymer with a specific aromatic polyester capable of forming anisotropic molten phase. CONSTITUTION: This composition is obtained by blending (B) 0.1 to 60 pts.wt. of a copolymer from an α-olefin (preferably, ethylene) and glycidyl ester of an α,β-unsaturated acid (preferably, glycidyl methacrylate) with (A) 100 pts.wt. of an aromatic polyester capable of forming anisotropic molten phase, selected from (i) polyesters consisting of units of formula I (X is expressed by formula V, etc.), (ii) polyesters consisting of units of formula I to III (Y is expressed by formula VI, etc.) and polyesters consisting of units of formula I to IV (Z is expressed by formula VII, etc.), having a melt viscosity of 10 to 15000 poises measured under the condition that with a shear rate of 1000 (1/sec) at a temperature higher by 40 deg.C than the temperature at which the polyester begins to exhibit its anisotropy (crystal liquid formation-initiating temperature).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aromatic polyester composition capable of being melt-molded at a temperature of 400 ° C. or lower and providing a molded article having excellent fluidity, heat resistance and mechanical properties.

[0002]

2. Description of the Related Art In recent years, the demand for higher performance of plastics has been increasing, and many polymers having various new properties have been developed and put on the market. Among them, they are characterized by a parallel arrangement of molecular chains. Attention is paid to the fact that optically anisotropic liquid crystal polymers have excellent mechanical properties.

As the polymer forming the anisotropic melt phase, for example, a liquid crystal polymer obtained by copolymerizing p-hydroxybenzoic acid with polyethylene terephthalate (Japanese Patent Laid-Open No. 49-72393).
Gazette), p-hydroxybenzoic acid and 6-hydroxy-
Liquid crystal polymer copolymerized with 2-naphthoic acid
77691), and a liquid crystal polymer obtained by copolymerizing p-hydroxybenzoic acid with 4,4'-dihydroxybiphenyl, terephthalic acid and isophthalic acid (Japanese Patent Publication No. 57-24).
No. 407) is known.

Further, a composition comprising an amorphous aromatic polyester and a copolymer of an olefin and glycidyl methacrylate and / or glycidyl acrylate is disclosed in JP-A-60-25046.

[0005]

The above liquid crystal polymer exhibits excellent Izod impact strength due to its orientation during molding, as compared with a crystalline polymer having no liquid crystallinity, such as polyethylene terephthalate and polybutylene terephthalate. On the contrary, it was found that surface impacts such as falling balls and falling weight impacts were inferior. It is also known that molded articles have large anisotropy.

In the composition containing the amorphous aromatic polyester and the olefin copolymer, the olefin copolymer is a falling ball of the amorphous aromatic polyester,
The surface impact strength such as falling weight impact is hardly improved, and the effect of reducing anisotropy is not found. Therefore, the object of the present invention is to improve mechanical properties, particularly surface impact resistance and anisotropy, without impairing the excellent fluidity and heat resistance of an aromatic polyester forming an anisotropic melt phase. Is.

[0007]

The present inventors have arrived at the present invention as a result of extensive studies to solve the above problems. That is, the present invention is selected from the following (A) to (C), and is measured at a shear rate of 1,000 (1 / sec) at a temperature 40 ° C. higher than the temperature at which anisotropy starts (liquid crystal starting temperature). (B) α-olefins and glycidyl ester of α, β-unsaturated acid per 100 parts by weight of an aromatic polyester forming an anisotropic molten phase having a melt viscosity of 10 to 15,000 poise. An aromatic polyester composition containing 0.1 to 60 parts by weight of a copolymer.

(A) Aromatic polyester forming an anisotropic molten phase composed of the following structural unit (I) (b) The following structural units (I), (II) and (III)
An aromatic polyester which forms an anisotropic melt phase consisting of (c) An aromatic polyester which forms an anisotropic melt phase consisting of the following structural units (I), (II), (III) and (IV)

Embedded image (However, X in the formula is

[Chemical 9] And / or

[Chemical 10] And Y is

[Chemical 11] and

[Chemical 12] Represents one or more groups selected from

[Chemical 13] And / or

Embedded image Indicates. The carbonyl groups in the dicarboxylic acid component in (III) are in a meta and / or para relationship with each other.

The structural units (III) and (IV)
And the structural unit (II) are substantially equimolar. )

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The aromatic polyester (A) used in the present invention is an aromatic polyester (B) (I) which forms an anisotropic melt phase composed of the structural unit (I) (A),
Aromatic polyester forming an anisotropic melt phase composed of (II) and (III) and (C) (I), (I
I), (III) and (IV) selected from aromatic polyesters forming an anisotropic melt phase, preferably structural units (I), (II) and (II).
Aromatic polyester forming an anisotropic melt phase consisting of I), structural units (I), (II), (III) and (I
V) is an aromatic polyester forming an anisotropic melt phase.

The above structural unit (I) is a structural unit formed of at least one selected from p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid, preferably p-hydroxybenzoic acid.

The structural unit (II) is one or more dihydroxy compounds selected from 4,4'-dihydroxybiphenyl, hydroquinone, t-butylhydroquinone, 2,6-dihydroxynaphthalene and phenylhydroquinone, preferably hydroquinone, t-. A structural unit formed from a diol component consisting of a dihydroxy compound in which 4,4′-dihydroxybiphenyl is used in combination with one or more selected from butylhydroquinone and phenylhydroquinone.

The structural unit (III) is a structural unit formed from terephthalic acid and / or isophthalic acid.

The structural unit (IV) is a structural unit formed from 2,6-naphthalenedicarboxylic acid and / or a structural unit formed from 4,4'-dicarboxydiphenyl ether dicarboxylic acid.

The aromatic polyester composed of the above structural units is required to form an anisotropic melt phase, and is 350 ° C.
Aromatic polyesters capable of exhibiting optical anisotropy at the following temperatures are preferred.

Of these, aromatic polyesters comprising the following structural units (I) 'to (III) can be preferably used from the viewpoints of heat resistance and fluidity of the obtained molded product.

[0017]

[Chemical 15] (However, X in the formula is

Embedded image and

[Chemical 17] Represents one or more groups selected from The carbonyl groups in the dicarboxylic acid component in (III) are in a meta and / or para relationship with each other. The total amount of the structural units (II) 'and (II) "and the structural unit (III) are substantially equimolar.) In the aromatic polyester preferably usable in the present invention, the structural unit (I)' is
Represents a structural unit formed from p-hydroxybenzoic acid.

The structural unit (II) 'is a structural unit of polyester produced from 4,4'-dihydroxybiphenyl.

The structural unit (II) "is hydroquinone, t
-A structural unit formed from one or more dihydroxy compounds selected from butyl hydroquinone, 4,4'-diphenyl ether, 2,6-dihydroxynaphthalene and phenyl hydroquinone.

The structural unit (III) is a structural unit formed from terephthalic acid and / or isophthalic acid.

The copolymerization amount is not particularly limited, but from the viewpoint of fluidity, the structural unit (I) 'is (I)', (II) '.
And 40 to 90 mol% of the total of (II) ″, and the total of structural units (II) ′ and (II) ″ is (I) ′ and (II) ′.
And (II) ″ are preferably 60 to 10 mol%. The molar ratio [(II) ′ / (II) ″] of the structural units (II) ′ and (II) ″ is 1/9 to 9 / 1, preferably 7.5 / 2.5 to 4/6 from the viewpoint of fluidity.
Is preferred.

Further, the dicarboxylic acid component in the structural unit (III) is terephthalic acid and / or isophthalic acid, but the molar ratio of terephthalic acid / isophthalic acid is 10
/ 0 to 6.5 / 3.5 is preferable.

Further, in addition to the components constituting the above (I) 'to (III), 1,2-bis (phenoxy) ethane-
Those obtained by copolymerizing 4,4'-dicarboxylic acid and 1,2-bis (2-chlorophenoxy) ethane-4,4'-dicarboxylic acid can also be preferably used.

In addition to the components of the structural unit selected from the structural units (I) to (IV), 4,4'-diphenyldicarboxylic acid, 3,4'-diphenyldicarboxylic acid,
Aromatic dicarboxylic acids such as 2,2′-diphenyldicarboxylic acid and 1,2-bis (chlorophenoxy) ethane-4,4′-dicarboxylic acid, alicyclic dicarboxylic acids such as hexahydroterephthalic acid, and aroma such as resorcin Group dihydroxy compounds, aromatic hydroxycarboxylic acids such as m-hydroxybenzoic acid, p-aminophenol, p-aminobenzoic acid and β-hydroxyethoxybenzoic acid, etc. within a range of proportions that do not impair the object of the present invention. It can be copolymerized.

The above-mentioned aromatic polyester can be produced according to the conventional polycondensation method of polyester and is not particularly limited.
Typical examples include the following methods (1) to (4).

(1) An acylated product of p-acetoxybenzoic acid, an acylated product of an aromatic hydroxy compound such as 4,4'-diacetoxybiphenyl, and an aromatic dicarboxylic acid such as terephthalic acid are produced by deacetic acid polycondensation reaction. Method.

(2) p-hydroxybenzoic acid, 4,4 '
A method of producing from an aromatic dihydroxy compound such as dihydroxybiphenyl, an aromatic dicarboxylic acid such as terephthalic acid, and acetic anhydride by a deacetic acid polycondensation reaction.

(3) A method for producing from phenyl ester of p-hydroxybenzoic acid and aromatic dihydroxy compound such as 4,4'-dihydroxybiphenyl and diphenyl ester of aromatic dicarboxylic acid such as terephthalic acid by dephenol polycondensation.

(4) A desired amount of diphenyl dicarbonate is reacted with an aromatic dicarboxylic acid such as p-hydroxybenzoic acid and terephthalic acid to form diphenyl esters, and then aromatic dihydroxy such as 4,4'-dihydroxybiphenyl. A method for producing a compound by adding a compound and performing a dephenol polycondensation reaction.

Typical catalysts used in the polycondensation reaction are metal compounds such as stannous acetate, tetrabutyl titanate, lead acetate, antimony trioxide, magnesium, sodium acetate, potassium acetate and trisodium phosphate. It is particularly effective in dephenol polycondensation.

The aromatic polyester which can be preferably used in the present invention forms an anisotropic melt phase, but the shear rate is 1,000 (1) at a temperature 40 ° C. higher than the temperature at which anisotropy begins (liquid crystal starting temperature). / Sec) has a melt viscosity of 10 to 15,000 poise, especially 10 to 10,000.
Those of 0 poise can be preferably used.

Further, the α-olefins used in the copolymer (B) consisting of the α-olefins and the glycidyl ester of the α, β-unsaturated acid used in the present invention preferably have 2 to 4 carbon atoms. Specifically, ethylene, propylene, butene-1 and the like can be mentioned, and among them, ethylene can be preferably used. Further, the glycidyl ester of α, β-unsaturated acid has the general formula

Embedded image (In the formula, R is a hydrogen atom or a lower alkyl group.)
Are specifically glycidyl acrylate, glycidyl methacrylate, glycidyl ethacrylic acid, and the like, among which glycidyl methacrylate is preferably used. The copolymerization amount of the glycidyl ester of α, β-unsaturated acid is appropriately in the range of 1 to 50 mol%. Further, if it is 40 mol% or less, unsaturated monomers copolymerizable with the above copolymers, that is, vinyl ethers, vinyl esters such as vinyl acetate and vinyl propionate,
Acrylic acid and methacrylic acid esters such as methyl, ethyl and propyl, acrylonitrile and styrene may be copolymerized.

The above-mentioned copolymer (B) used in the present invention is partially grafted with an unsaturated carboxylic acid or its derivative onto a copolymer of ethylene and an α-olefin having 3 or more carbon atoms. A modified ethylene-based polymer obtained by grafting an unsaturated carboxylic acid or a derivative thereof onto the obtained modified ethylene-based polymer and a copolymer of ethylene, an α-olefin having 3 or more carbon atoms and a non-conjugated diene is selected. Can be substituted with one or more of the above-mentioned olefin-based polymers.

As the α-olefin having 3 or more carbon atoms,
Examples thereof include propylene, butene-1, pentene-1, 3-methylpentene-1, octacene-1, and among them, propylene and butene-1 are preferably used. Further, as non-conjugated diene, 5-methylidene-2-norbornene, 5-ethylidene-2-norbornene, 5-vinyl-2-norbornene, 5-propenyl-2-norbornene, 5-isopropenyl-2-norbornene, 5- Crotyl-2-norbornene, 5- (2-methyl-2-butenyl) -2-norbornene, 5- (2-ethyl-2-
Norbornene compounds such as butenyl) -2-norbornene, 5-methacrylnorbornene, 5-methyl-5-vinylnorbornene, dichloropentadiene, methyltetrahydroindene, 4,7,8,9-tetrahydroindene, 1,5- Cyclooctadiene, 1,4-hexadiene, isoprene, 6-methyl-1,5-heptadiene, 11-ethyl-1,1,1-tridecadiene and the like, preferably 5-methylidene-2-norbornene,
5-Ethylidene-2-norbornene, dichloropentadiene, 1,4-hexadiene and the like can be used.

The copolymerization ratio of the unmodified ethylene copolymer comprising ethylene and α-olefin having 3 or more carbon atoms is 40 /
The range of 60 to 99/1 (molar ratio) is preferable, and particularly 70
/ 30 to 95/5 (molar ratio) is preferable.

The amount of copolymerization of the α-olefin having 3 or more carbon atoms in the unmodified ethylene copolymer comprising ethylene, the α-olefin having 3 or more carbon atoms and the non-conjugated diene is 5
-80 mol% is preferable, 20-60 mol% is particularly preferable, and the copolymerization amount of non-conjugated diene is 0.1-20 mol%.
Is preferable, and 0.5 to 10 mol% is particularly preferably used.

Specific examples of the unmodified ethylene-based copolymer include ethylene / propylene copolymer and ethylene / butene-
1 copolymer, ethylene / propylene / dicyclopentadiene copolymer, ethylene / propylene / 5-ethylidene-2-norbornene copolymer and the like are preferably mentioned,
Among them, ethylene / propylene copolymers and ethylene / butene-1 copolymers containing no non-conjugated diene have good heat resistance and can be more preferably used.

The unsaturated carboxylic acid which is graft-reacted with the above unmodified ethylene-based copolymer to obtain a modified ethylene-based copolymer is preferably acrylic acid, methacrylic acid,
Examples include ethacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, butenedicarboxylic acid and the like. Further, as their derivatives, alkyl esters,
Examples thereof include glycidyl ester, acid anhydride, and imide. Among these, glycidyl ester, acid anhydride, and imide are preferable.

Preferred specific examples of the unsaturated carboxylic acid or its derivative are maleic acid, fumaric acid, glycidyl acrylate, glycidyl methacrylate, glycidyl ethacrylic acid, glycidyl itaconic acid, diglycidyl citraconic acid, butenedicarboxylic acid diester. Glycidyl ester, maleic anhydride, itaconic anhydride, citraconic anhydride, maleic acid imide, itaconic acid imide, citraconic acid imide, and the like, in particular, glycidyl methacrylate, maleic anhydride, itaconic anhydride, maleic acid imide is preferably used. it can. Two or more kinds of these unsaturated epoxy monomers may be used in combination.

The amount of the graft reaction of the unsaturated carboxylic acid or its derivative is in the range of 0.01% by weight or more from the viewpoint of the effect of improving mechanical properties, particularly surface impact resistance, and 10% by weight or less from the viewpoint of heat resistance of the aromatic polyester. Is preferred, and especially 0.
It is preferably from 05 to 5% by weight.

The term "grafting reaction" as used herein means that the unsaturated carboxylic acid or its derivative chemically bonds to the unmodified ethylene copolymer.

The modified ethylene-based copolymer is an unmodified ethylene-based copolymer having an unsaturated carboxylic acid or derivative thereof and 0.001 to 0.1 based on the unmodified ethylene-based copolymer.
It can be produced by adding a weight% of an organic oxide and melt-kneading at 150 to 300 ° C. As a device for melt mixing, a screw extruder, a Banbury mixer or the like can be used.

Specific examples of the organic peroxide which can be preferably used in this grafting reaction include tert-butylcumyl peroxide, di-tert-butylperoxide, dicumyl peroxide and 2,5-dimethyl-2,5- Di (tert−
Butylperoxy) hexane, 2,5-dimethyl-2,
5-di (tert-butylperoxy) hexyne-3, α,
α′-di- (tert-butylperoxy) diisopropylbenzene and the like.

The above-mentioned olefin polymers may be used in combination of two or more kinds.

The blending amount of the above copolymer (B) is preferably 0.1 to 60 parts by weight, particularly 0.5 to 20 parts by weight, based on 100 parts by weight of the aromatic polyester (A). If it is less than 0.1 part by weight, the effect of improving mechanical properties, especially surface impact resistance is small, and if it is more than 60 parts by weight, an aroma forming an anisotropic molten phase such as high elastic modulus, excellent molding fluidity and heat resistance. Either case is not preferable because the advantages of the group polyester are impaired.

Further, with respect to the above aromatic polyester, a reinforcing agent such as glass fiber, carbon fiber, asbestos, a filler, a nucleating agent, etc. within the range not impairing the object of the present invention.
Add additives such as pigments, antioxidants, stabilizers, plasticizers, lubricants, release agents and flame retardants, and other thermoplastic resins,
Desired characteristics can be imparted.

The method for producing the composition of the present invention is not particularly limited, but a method in which an aromatic polyester, an olefin polymer and, if necessary, other additives are melt-kneaded using an extruder is preferable. .

According to the present invention, the obtained aromatic polyester composition can be easily molded by a method such as injection molding or extrusion molding, which can be usually melt-molded at 400 ° C. or lower. The molded product exhibits excellent performance.

[0049]

The present invention will be described in more detail with reference to the following examples.

Reference Example 1 519 parts by weight of p-acetoxybenzoic acid, 184 parts by weight of 4,4'-diacetoxybiphenyl, 85 parts by weight of t-butyl hydroquinone diacetate, 19.4 parts by weight of hydroquinone diacetate and 186 parts by weight of terephthalic acid. Part was placed in a reaction vessel equipped with a stirring blade and a distillation tube, reacted under a nitrogen gas atmosphere at 250 to 340 ° C. for 3.0 hours, heated to 350 ° C., and then depressurized to 1.5 mmHg. Then, it was further heated for 1.0 hour to carry out a polycondensation reaction to obtain a resin A having the following theoretical structural formula.

[0051]

[Chemical 19] 1 / m / n / o / p = 72/17 / 8.5 / 2.5 / 2
8 Further, when this resin A was placed on a sample stage of a polarization microscope and the temperature was raised to check the optical anisotropy, good optical anisotropy was shown at 307 ° C. or higher.

The inherent viscosity of this polyester (measured in pentafluorophenol at a concentration of 0.1% by weight at 60 ° C.) is 4.3, 347 ° C., shear rate 1,000.
The melt viscosity at (1 / sec) was 2,600 poise.

Reference Example 2 541 parts by weight of p-acetoxybenzoic acid, 184 parts by weight of 4,4'-diacetoxybiphenyl, 62 parts by weight of hydroquinone diacetate and 124 parts by weight of terephthalic acid,
42 parts by weight of isophthalic acid was charged into a reaction vessel equipped with a stirring blade and a distillation tube, reacted at 250 to 360 ° C. for 3 hours under a nitrogen gas atmosphere, depressurized to 1 mmHg, further heated for 1 hour, and subjected to polycondensation. Was completed, and Resin B having the following theoretical structural formula was obtained.

[0054]

Embedded image 1 / m / n / o / p = 75/17/8 / 18.75 /
6.25 This polyester was placed on a sample stage of a polarizing microscope and the temperature was raised to check the optical anisotropy. As a result, good optical anisotropy was shown at 305 ° C. or higher.

The logarithmic viscosity of this polyester (measured under the same conditions as in Reference Example 1) was 4.1, and the melt viscosity at 345 ° C. and a shear rate of 1,000 (1 / sec) was 6,200 poises. .

Reference Example 3 (Production of Modified Ethylene Polymer) 4 parts by weight of glycidyl methacrylate and 2, based on 100 parts by weight of ethylene / butene-1 copolymer (copolymerization amount of butene-1 of 10 mol%). 5-dimethyl-2,5- (tert
0.015 parts by weight of -butylperoxy) hexyne-3 was charged into a Henschel mixer in which nitrogen was passed, and the mixture was stirred for 6 minutes to prepare a uniform mixture.

Using a 40 mmφ extruder equipped with a screw of Dalmarge type at L / D28, the mixture was rotated at a screw speed of 80 rpm and a cylinder temperature of 20.
It was extruded under the condition of 0 ° C. to obtain pellets (a) of the modified ethylene copolymer.

After crushing the pellets, acetone was added thereto, and unreacted glycidyl methacrylate was extracted with a Soxhlet extruder for 20 hours. Further, after drying the pellet, it was dissolved in p-xylene and the ultraviolet absorption spectrum was measured to quantify the graft reaction amount of glycidyl methacrylate. As a result, glycidyl methacrylate was 1.1.
It was found that the graft reaction was by weight.

Example 1 100 parts by weight of Resin A obtained in Reference Example 1 was dry-blended with 10 parts by weight of an ethylene-glycidyl methacrylate (90/10 mol) copolymer as an olefin polymer, and 350 ° C. After melt-kneading with a single-screw extruder set to, pelletization was performed.

The obtained pellets were manufactured by Sumitomo Nestal injection molding machine, Promat 40/25 (Sumitomo Heavy Industries, Ltd.)
Manufactured), cylinder temperature 350 ℃, mold temperature 90 ℃
2mm thick circular plate and 3mm thick square plate were formed under the conditions described above, and the obtained 2mm thick circular disc was used to perform a DuPont falling ball impact test (sphere radius 6mm, load 250g). Was used to measure the molding shrinkage. The results are shown in Table 1.

Example 2 A disk and a square plate obtained by the same method as in Example 1 except that the resin B obtained in Reference Example 2 was used were tested by the same method as in Example 1. The results are shown in Table 1.

Examples 3 and 4 Resins C and D represented by the following theoretical structural formulas and an ethylene-glycidyl methacrylate (molar ratio 90/10) copolymer were blended and extruded in the proportions shown in Table 1 to give Example 1. Molding was carried out under the same conditions as above, and the falling ball impact test of the disc / square plate and the molding shrinkage were measured. The results are shown in Table 1.

[Resin C]

[Chemical 21] l / m = 75/25 (liquid crystal starting temperature 256 ° C., shear rate 1,000 (1 /
Second) Melt viscosity at 296 ° C 2,200 poise) [Resin D]

[Chemical formula 22] 1 / m / n = 67/33/33 (liquid crystal starting temperature 373 ° C., shear rate 1,000 (1 /
Second) Melt viscosity at 413 ° C. 8,600 poise) Comparative Examples 1 to 4 Molding was performed in the same manner as in Examples 1 to 4 except that the olefin polymer was not used, and the same evaluation was performed. The results are shown in Table 1.

[0064]

[Table 1] Example 5 Resin A and glass fiber (3 mm long, diameter 10
μ, chopped strand) and an ethylene-glycidyl methacrylate (90/10 molar ratio) copolymer were blended and extruded at a ratio shown in Table 2 to prepare a molded article similar to that of Example 1 and subjected to a falling ball impact test. I did. Table 2 shows the results
Shown in

Examples 6 and 7 Resins C and D, glass fiber (3 mm length, diameter 10 μ, chopped strand) and ethylene-glycidyl methacrylate (90/10 molar ratio) copolymer were blended at the ratios shown in Table 2. Extrusion was performed, molding was performed under the same conditions as in Example 1, and a falling ball impact test was performed. Table 2 shows the results.

The above results show that the aromatic polyester composition of the present invention has excellent falling ball impact strength and reduced anisotropy.

Comparative Examples 5-8 Example 7 except that no olefin polymer was used.
Molded and evaluated in the same manner as in ~ 9. Table 2 shows the results.

[0068]

[Table 2]

[0069]

The aromatic polyester composition of the present invention is
Since it has excellent fluidity, heat resistance, impact strength and reduced anisotropy, it can be used in various fields such as automobile outer panel applications.

Claims (4)

[Claims] 1. A temperature selected from the following (A) to (C), which is 40 from the temperature at which anisotropy begins to occur (liquid crystal starting temperature):
(B) to 100 parts by weight of an aromatic polyester forming an anisotropic melt phase having a melt viscosity of 10 to 15,000 poise measured under a condition of a high shearing rate of 1,000 (1 / sec) at a high temperature (B). ) An aromatic polyester composition containing 0.1 to 60 parts by weight of a copolymer composed of an α-olefin and a glycidyl ester of an α, β-unsaturated acid. (A) Aromatic polyester forming an anisotropic molten phase composed of the following structural unit (I) (b) The following structural unit (I), (II) and (III)
Aromatic polyester forming an anisotropic melt phase consisting of (c) Aromatic polyester forming an anisotropic melt phase consisting of the following structural units (I), (II), (III) and (IV) ] (However, X in the formula is And / or And Y is And Z represents one or more groups selected from And / or Indicates. The carbonyl groups in the dicarboxylic acid component in (III) are in a meta and / or para relationship with each other. Further, the total of the structural units (III) and (IV) and the structural unit (II) are substantially equimolar. ) 2. The aromatic polyester composition according to claim 1, wherein the aromatic polyester (A) forming the anisotropic molten phase has a melt viscosity of 10 to 10,000 poise. 3. A part of a copolymer (B) composed of α-olefins and a glycidyl ester of an α, β-unsaturated acid is converted into a copolymer composed of ethylene and an α-olefin having 3 or more carbon atoms. On the other hand, for a modified ethylene polymer obtained by grafting 0.01 to 10% by weight of an unsaturated carboxylic acid or a derivative thereof and a copolymer composed of ethylene, an α-olefin having 3 or more carbon atoms and a non-conjugated diene. , 0.0
The fragrance according to claim (1), wherein 1 to 10% by weight of an unsaturated carboxylic acid or a derivative thereof is substituted with one or more olefin polymers selected from modified ethylene polymers obtained by grafting. Group polyester composition. 4. An aromatic polyester composition which can be melt-molded at 400 ° C. or lower.
The aromatic polyester composition according to the item.