JPH02166154A - Thermoplastic polyester composition - Google Patents

Abstract

PURPOSE:To obtain the title composition excellent in mechanical properties and surface gloss by mixing a thermoplastic polyester with a specified multiphase structure thermoplastic resin and a carboxylic acid (metal salt) in a specified ratio. CONSTITUTION:50-99wt.% thermoplastic polyester (e.g. polyethylene terephthalate) (I) is mixed with 50-1wt.% multiphase structure thermoplastic resin (II) comprising 5-95 pts.wt. ethylene copolymer comprising ethylene and an unsaturated glycidyl monomer (e.g. glycidyl methacrylate) and 95-5 pts.wt. vinyl (co)polymer obtained from at least one vinyl monomer (e.g. styrene), wherein either of the (co)polymers forms a dispersed phase of a particle diameter of 0.001-10mum and 0.1-10 pts.wt., per 100 pts.wt. total of components I and II, carboxylic acid (metal salt) (e.g. stearic acid).

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a thermoplastic polyester composition that has improved moldability without reducing mechanical properties or deteriorating surface gloss. The molded articles are useful as industrial parts, automotive parts, electrical and electromechanical parts.

[Prior Art] Thermoplastic polyesters such as polyethylene terephthalate (PET) and polybutylene terephthalate (POT) have been finding use in a wide range of fields due to their excellent properties.

However, PET has a particularly slow crystallization rate compared to other crystalline polymers, and therefore has poor formability.
Because BT has a high crystallization rate, that is, it has good crystal properties, it does not have a sufficient notched Izot impact value. When the amount of addition is large, there is a problem that moldability decreases and surface gloss deteriorates due to the addition of the reinforcing material.

Therefore, we improved the mechanical properties of thermoplastic polyester,
In addition, in order to improve moldability, an olefinic copolymer consisting of an α-olefin and a glycidyl ester of an α,β-unsaturated acid, stearic acid, epoxystearic acid, terephthalic acids, isophthalic acids, etc. are added to the thermoplastic polyester. A thermoplastic polyester composition has been proposed in which a combination of at least one metal salt of
5-139448@publication).

Similarly, in order to improve impact resistance and moldability, the same olefin copolymer as above was used,
Furthermore, a thermoplastic polyester composition to which carboxylic acid is added has also been proposed (Japanese Unexamined Patent Publication No. 159247/1983).

[Problems to be Solved by the Invention] However, with the above-mentioned conventional technology, the moldability is still insufficient when reinforcing materials are added, and it is difficult to improve surface gloss without reducing mechanical properties. Met.

[Means for Solving the Problem] As a result of examining the above-mentioned conventional technology, the present inventors found that the above-mentioned problem was caused by olefin copolymers, and conducted long-term research on this olefin copolymer. As a result, they discovered that by using a specific multiphase thermoplastic resin in combination with a carboxylic acid or a metal salt of a carboxylic acid, the above-mentioned rapid onset/decrease in the prior art can be significantly improved, and the present invention has been completed. Ta.

That is, the present invention provides (I) 50 to 99% by weight of thermoplastic polyester (II
) Vinyl (co)polymer 95 obtained from 5 to 95 parts by weight of an ethylene copolymer consisting of ethylene and an unsaturated glycidyl group-containing monomer and at least one vinyl monomer
~5 parts by weight, and one (co)polymer has a particle size o
, 50 to 1% of multiphase II thermoplastic resin forming a dispersed phase of oot to 10 μm, and the above (I) +
(IF) per 100 parts by weight, (III) carboxylic acid or metal salt of carboxylic acid 0.1
10 parts by weight of thermoplastic polyester composition.

The thermoplastic polyester used in the present invention is essentially a polyester having an aromatic ring in the chain unit of the polymer,
Aromatic dicarboxylic acid (or its ester-forming derivative) and diol (or its ester-forming derivative)
It is a polymer or copolymer obtained by a condensation reaction mainly consisting of

The aromatic dicarboxylic acids mentioned here include terephthalic acid; isophthalic acid; phthalic acid; 2,6-naphthalene dicarboxylic acid; 1,5-naphthalene dicarboxylic acid (p-
carboxyphenyl)methane: anthracene dicarboxylic acid; 4,4' - diphenyldicarboxylic acid; 4,4'
-Diphenyl ether dicarboxylic acid: 1,2-bis(phenoxy)ethane 4,4'-dicarboxylic acid or ester-forming derivatives thereof.

Diol components include aliphatic diols having 2 to 1 G of carbon atoms, such as ethylene glycol; propylene glycol: 1,4-butanediol; neopentyl glycol: 1,5-bentanediol: 1,6-hexanesiol: deca Methylene diglycol: such as cyclohexanediol, or a long chain glycol with a molecule m of 400 to 6000, i.e. polyethylene glycol; poly-1
, 3-propylene glycol: polytetramethylene glycol, and mixtures thereof.

Preferred thermoplastic polyesters used in the present invention include PET; polypropylene terephthalate; PBT: polyhexamethylene terephthalate; polyethylene-2,6-naphthalate; polyethylene-1,2-bis(phenoxy)ethane- 4,4′ −
Examples include dicarboxylate. More preferred is PET:PBT.

The intrinsic viscosity of these thermoplastic polyesters is trisluo 0 vinegar 1 (25)/methylene chloride (75) 100a
measured at 25±0.10° C. as a concentration of 0.329 in e. Preferably, the intrinsic viscosity is 0.4 to 4.0/9
It is. If it is less than 0.4 dl/9, the thermoplastic polyester will not be able to exhibit sufficient mechanical strength, which is not preferable.

If it exceeds 4.0 dl/g, the fluidity during melting will decrease and moldability will deteriorate.

The ethylene copolymer in the multiphase thermoplastic resin used in the present invention is an epoxy group-containing ethylene copolymer, and is a copolymer of ethylene and an unsaturated glycidyl group-containing 1m body.

The unsaturated glycidyl group-containing monomers include glycidyl acrylate; glycidyl methacrylate; monoglycidyl itaconate; butene tricarboxylic acid monoglycidyl ester; butene tricarboxylic acid triglycidyl ester; and maleic acid, phosphoric acid, Examples include glycidyl esters such as fumaric acid or vinyl glycidyl ether: allyl glycidyl ether: glycidyloxyethyl vinyl ether; glycidyl ethers such as styrene-p-glycidyl ether: p-glycidyl styrene; particularly preferred is glycidyl methacrylate. : Allyl glycidyl ether can be mentioned.

In the present invention, particularly preferred ethylene copolymers are:
It is an ethylene/glycidyl methacrylate copolymer.

The ethylene copolymer is preferably produced by high-pressure radical polymerization.

Specifically, the vinyl (co)polymer in the multiphase thermoplastic resin used in the present invention includes styrene, nuclear-substituted styrene such as methylstyrene, dimethylstyrene,
Ethylstyrene, isopropylstyrene, chlorostyrene, α-substituted styrene such as α-methylstyrene, α-
C1-7 alkyl esters of vinyl aromatic monomers such as ethyl styrene, diacrylic acid or methacrylic acid, e.g. (meth)acrylic acid esters such as methyl, ethyl, propyl, isopropyl, butyl esters of (meth)acrylic acid Monomer; (meth)acrylonitrile monomer; vinyl ester monomers such as vinyl acetate and vinyl propionate; (meth)acrylamide monomer; vinyl monomers such as maleic anhydride and maleic acid monoesters and diesters It is a (co)polymer obtained by polymerizing one or more types of polymers.

Among these, vinyl aromatic monomers, (meth)acrylic acid ester monomers, (meth)acrylonitrile monomers, and vinyl ester monomers are particularly preferably used.

In particular, a vinyl (co)polymer containing 50% or more of a vinyl aromatic monomer or a (meth)acrylic acid ester monomer is the most preferred embodiment since it has good dispersibility in the thermoplastic polyester resin.

The multiphase thermoplastic resin referred to in the present invention refers to an ethylene copolymer or vinyl (co)polymer i-mix containing a vinyl (co)polymer or ethylene copolymer as a different component. A polymer in which the polymer is uniformly dispersed in a spherical shape.

Particle diameter of the dispersed polymer t is 0.001 to 10 μm
, preferably 0.01 to 5 μm. If the particle size of the dispersed resin is less than 0.001 μm or more than 10 μm, the dispersibility when blended into thermoplastic polyester is poor, resulting in poor dispersibility of carboxylic acid or metal salt of carboxylic acid, resulting in poor moldability. and the surface gloss deteriorates.

The number average degree of polymerization of the vinyl (co)polymer in the multiphase structured thermoplastic resin of the present invention is from 5 to ooo, preferably 10.
~5,000. When the number average degree of polymerization is less than 5, the heat resistance of the composition of the present invention tends to decrease, and when the number average degree of polymerization exceeds to, ooo, the melt viscosity increases and the carboxylic acid or the metal of the carboxylic acid Salt dispersibility tends to decrease.

The thermoplastic resin having a multiphase structure in the present invention has an ethylene copolymer content of 5 to 95% by weight, preferably 20 to 90% by weight.
It consists of Therefore, the vinyl (co)polymer content is 95 to 5% by weight, preferably 80 to 10% by weight.

If the content of the ethylene copolymer is less than 5% by weight, the compatibilizing effect with the thermoplastic polyester cannot be sufficiently exhibited, and the dispersibility of the carboxylic acid or the metal salt of the carboxylic acid decreases. If this is exceeded, the mechanical properties will deteriorate.

The thermoplastic resin having a multiphase structure in the present invention preferably has a graft copolymer as its main component.

The grafting method for producing the multiphase thermoplastic resin of the present invention may be any generally well-known method such as chain transfer method or ionizing radiation irradiation method, but the most preferred method is the method shown below. This is due to The reason for this is that the grafting efficiency is high and secondary aggregation due to heat does not occur, so performance is more effectively expressed.

Hereinafter, a method for producing a multiphase thermoplastic resin according to the present invention will be specifically explained.

That is, water is suspended in m parts of an ethylene copolymer, and then 5 to 4 m parts of at least one vinyl 1lf
00 parts by weight, one or two radical (co)polymerizable organic peroxides represented by the following general formula (a) or (b)
A mixture of more than 0.1 to 10 parts by weight per 100 parts by weight of the vinyl liquor! part, and a radical polymerization initiator with a decomposition temperature of 40 to 90°C to obtain a half-life of 10 hours, for a total of 100 parts by weight of vinyl monomer and radical (co)polymerizable organic peroxide. A solution containing 0.01 to 5 parts by weight of the vinyl monomer and the radical (co)polymerizable organic peroxide is added thereto and heated under conditions that do not substantially cause decomposition of the radical polymerization initiator. and a radical polymerization initiator are impregnated into the ethylene copolymer, and when the impregnation rate exceeds the initial 50% by weight and reaches E, the temperature of this aqueous suspension is raised, and the vinyl monomer and radical By copolymerizing a (co)polymerizable organic peroxide in an ethylene copolymer,
A grafted precursor (A) is obtained. This grafted precursor is also a multiphase thermoplastic.

Therefore, this grafted precursor (Δ) may be directly melted and mixed with the thermoplastic polyester, but the most preferred is a multiphase thermoplastic resin (■) obtained by kneading the grafted precursor. .

That is, the grafting precursor (A) was added in an amount of 100 to 30 (1
Grafted by crossing the wires under melting temperature of °C, resulting in multiphase
1il thermoplastic resin. At this time, a multiphase thermoplastic resin can also be obtained by separately mixing an ethylene copolymer (B) or a vinyl (co)polymer (C) with the grafting precursor and kneading it while melting.

The radical (co)polymerizable organic peroxides represented by the general formulas (a) and (III)) are the radical (co)polymerizable organic peroxides represented by the general formulas (where R
4 is a hydrogen atom or an alkyl group having 1 to 2 carbon atoms, R, R
7 is a hydrogen atom or a methyl group, R6 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, R, R and R, R are each an alkyl group having 1 to 4 carbon atoms, R and Rlo are 1 to 4 carbon atoms
~12 alkyl group, phenyl group, alkyl-substituted phenyl group or cycloalkyl group having 3 to 12 carbon atoms,
m is 1 or 2 and n is 0.1 or 2).

This is a compound represented by

Examples of the radical (co)polymerizable organic peroxide represented by general formula (a) include t-butylperoxyacryloyloxyethyl carbonate, t-amylperoxyacryloyloxyethyl carbonate, and t-hexylperoxy Acryloyloxyethyl carbonate, 1,
1,3.3-Tetramethylbutylperoxyacryloyloxyethyl carbonate, cumylperoxyacryloyloxyethyl carbonate, p-inbu0bilcumylperoxyacryloyloxyethyl carbonate, t-
Butylperoxymethacryloyloxyethyl carbonate, t-amylberoxymethacryloyloxyethyl carbonate, 1,1,3.3-tetramethylbutylberoxymethacryloyloxyethyl carbonate, cumylberoxymethacryloyloxyethyl carbonate, p
-isoprobylcumylberoxymethacryloyloxyethyl carbonate, t-butylperoxyacryloyl 0
xyethoxyethyl carbonate, t-amylperoxyacryloyl axyethoxyethyl carbonate, t-
hexylperoxyacryloyloxyethoxyethyl carbonate, 1,1,3.3-tetramethylbutylperoxyacryloyloxyethoxyethyl carbonate,
cumylperoxyacryloyloxyethoxyethyl car
bonatepropylcumylperoxyacryloyloxyethoxyethoxyethyl carbonate, t-pudylberoxymethacryloyloxyethoxyethoxyethyl carbonate, t-amylperoxymethacryloyloxyethoxyethyl carbonate,
t-hexylperoxymethacryloyloxyethoxyethoxyethyl carbonate, 1,1,3.3-tetramethylbutylperoxyacryloyloxyethoxyethyl carbonate, cumylperoxymethacryloyloxyethoxyethoxyethyl carbonate i., p-isopropylcumyl peroxymethacryloxyethoxyethyl carbonate,
t-Butylperoxyacryloyloxyisopropyl carbonate, t-amylperoxyacryloyloxyisopropyl carbonate, t-hexylperoxyacryloyloxyisopropyl carbonate, 1,1,3.3
-Tetramethylbutylberoxyacryloyloxyisopropyl carbonate, cumylperoxyacryloyloxyisopropyl carbonate, p-isopropylcumylperoxyacryloyloxyisopropyl carbonate, t-butylberoxymethacryloyloxyisopropyl carbonate, t-amyl Peroxymethacryloyloxyisopropyl carbonate, t-hexylperoxymethacryloyloxyisopropyl carbonate, 1
, 1,3.3-tetramethylbutylberoxymethacryloyloxyisobutylene carbonate, cumylperoxyacryloyloxyisopropyl carbonate, p-isobrobylcumylperoxymethacryloyloxyisopropyl carbonate, and the like.

Furthermore, as a compound represented by general formula (b), t
-Butylperoxyallyl carbonate t-amylperoxyallyl carbonate, t-hexylperoxyallyl carbonate, 1,1,3.3-tetramethylbutylperoxyallyl carbonate, p-menthane peroxyallyl carbonate tonate, t-7 milberoxy Methallyl carbonate, 1,1,3,3-tetramethylbutylberoxymethallyl carbonate! -, p-menthane peroxymethallyl carbonate, cumylperoxymethallyl carbonate, t-butylperoxyallyloxyethyl carbonate allyloxyethyl carbonate, t-butylbe J leoxymethallyl D xyethyl carbonate, t-amylberoxymethallyloxyethyl h -bonate, t-hexylberoxymetallyloxyethyl carbonate, t-butylperoxyallyloxyisopropyl carbonate, t-
Amylperoxyallyloxyisopropyl carbonate, t-hexylperoxyallyloxyisopropyl carbonate, t-butylberoxymetallyloxyisobutyrobutylene 0
Examples include vinyl carbonate and t-hexylberoxymetallyloxyisobrobyl carbonate.

Among them, preferred are t-butylperoxyacryloyloxyethyl carbonate, t-butylberoxymethacryloyloxyethyl carbonate, t-butylperoxyallyl carbonate, and t-butylperoxymethallyl carbonate.

In the present invention, 50-99% by weight of thermoplastic polyester is required, preferably 60-95% by weight.

Therefore, the polyphase structure thermoplastic resin is 50 to 1%,
Preferably, it is blended in a proportion of 40 to 511%.

If the thermoplastic polyester content is less than 50% by weight, the mechanical properties will deteriorate, and the mechanical properties will be reduced to 99N! ! If it exceeds 8%, the mechanical properties targeted by the present invention will deteriorate, and moldability and surface gloss cannot be improved.

The carboxylic acids used in the present invention include, for example, aliphatic carboxylic acids such as stearic acid, valmitic acid, lauric acid, montanic acid, oleic acid, linoleic acid, liluic acid, sebacic acid, capric acid, adipic acid, azelaic acid, and dodecanedicarboxylic acid. , benzoic acid, terephthalic acid, isophthalic acid,
Monomethyl terephthalic acid, monomethyl isophthalic acid, orthophthalic acid, naphthoic acid, anthracenecarboxylic acid,
Aromatic carboxylic acids such as biphenylcarboxylic acid, biphenyl Schiff J rubonic acid, naphthalene caffreponic acid, trimesic acid, trimellitic acid, cyclohexanecarboxylic acid,
Examples include alicyclic carboxylic acids such as cyclohexane dinonorboxylic acid and cyclopentanedicarboxylic acid. Preferably, aliphatic carboxylic acids such as stearic acid, valmitic acid, lauric acid, and oleic acid, benzoic acid, terephthalic acid,
Aromatic carboxylic acids such as isophthalic acid.

The metal salt of carboxylic acid used in the present invention is a metal salt of lithium, sodium, potassium, calcium, magnesium, aluminum, zinc, etc. of the carboxylic acid. Preferred are lithium, sodium, potassium, and calcium salts of stearic acid, barmitic acid, lauric acid, and oleic acid, monomethyl sodium terephthalate, monomethyl sodium isophthalate, and the like.

Two or more of these carboxylic acids or metal salts of carboxylic acids may be used in combination.

The amount of carboxylic acid or metal salt of carboxylic acid used in the present invention is 0.1 to 10 parts by weight based on 100 parts by weight of the thermoplastic polyester and the multiphase thermoplastic resin.
Parts by weight. If it is less than 0.1 parts by weight, moldability cannot be improved, and if it exceeds 10 parts by weight, mechanical properties will deteriorate and surface gloss will deteriorate.

In addition, in the present invention, other thermoplastic resins such as polyolefin resins, polyvinyl chloride resins, polyvinylidene chloride resins, polycarbonate resins, polyamide resins, and polyphenylene ethers may be used without departing from the gist of the present invention. resin, polyphenylene sulfide resin, polysulfone resin, natural rubber, synthetic rubber, inorganic flame retardants such as magnesium hydroxide and aluminum hydroxide, organic flame retardants such as halogen and phosphorus, crystal nucleating agents, lubricants, antioxidants, There is no problem in adding UV inhibitors, foaming agents, crosslinking agents, coloring agents, reinforcing agents, etc.

The thermoplastic polyester composition of the present invention has a temperature of 150 to
It can be melted and mixed at 300°C, preferably 180 to 320°C, and then easily molded by a conventional method such as injection molding or extrusion molding.

[Example] Hereinafter, the present invention will be explained in more detail with reference to Examples.

Reference example 1 (manufacture of multiphase structure thermoplastic resin 1a) Volume 5J
Put 2,500 g of pure water into a stainless steel autoclave, and add 2.5 g of polyvinyl alcohol as a suspending agent.
was dissolved. Among these, ethylene/glycidyl methacrylate copolymer (
(Contains glycidyl methacrylate m15 weight 1%) "Product name:
Rexval J-370 (N (Nippon Petrochemical!!
7009 (manufactured by Co., Ltd.) was added and stirred and dispersed. Separately, as a radical polymerization initiator, 1.5 g of benzoyl peroxide [trade name: Niver B'' (manufactured by NOF Ill. n-dodecylmercaptan 0.6 as regulator
Medyl methacrylate 3009 with 9 as vinyl monomer
and put this solution into the autoclave.
Stirred. Next, the temperature of the autoclave was raised to 60 to 65°C, and the autoclave was opened for 2 hours with stirring to obtain a vinyl monomer containing a radical polymerization initiator and a radical (co)polymerizable organic peroxide.
The body was impregnated into an epoxy group-containing ethylene copolymer.

Next, after confirming that the total amount of the impregnated vinyl monomer, radical (co)polymerizable organic peroxide, and radical polymerization initiator was at least 50% by weight, the temperature was increased to 80 to 85%. ℃ and maintained at that temperature for 7 hours to complete polymerization, washed with water and dried to obtain a grafted precursor. The methyl methacrylate polymer in this grafted precursor was extracted with ethyl acetate, and the number and average degree of polymerization were measured by GPC and found to be 700.

Next, this grafted precursor was extruded at 200° C. using a Laboplast Mill-axial extruder (Newly manufactured by Toyo Seiki Seisakusho) to cause a grafting reaction, thereby obtaining a multiphase thermoplastic resin [a].

When this multiphase structured thermoplastic resin was observed using a scanning electron microscope [trade name: JEOL JSHTa2OJ (manufactured by JEOL Ltd.), it was found that it had a multiphase structure in which true spherical resin particles with particle diameters of 0.1 to 0.2 μm were uniformly dispersed. It was a thermoplastic resin.

Note that the grafting efficiency of the methyl methacrylate polymer at this time was 68.8%.

Reference example 2 (manufacture of multiphase structure thermoplastic resin Ib) Reference example 1
Reference Example 1 was repeated to prepare a multiphase structure, except that 300 g of monomethyl methacrylate as the vinyl monomer was changed to styrene 3009, and n-dodecyl mercaptan was not used as the molecular m regulator. Thermoplastic resin mb was obtained.

At this time, the number average degree of polymerization of the styrene polymer was 900, and the average particle size of the resin dispersed in this resin composition was 0.3 to 0.4 μm.

1. Reference example 2 (manufacture of multiphase structure thermoplastic resin ■c)
, 300 g of styrene as a vinyl monomer was dissolved in 300 g of benzene as a solvent, and the molecule 11
A grafted precursor was produced by repeating Reference Example 2, except that 2.59 g of n-dodecylmercaptan was added as a moderating agent, and a multiphase thermoplastic resin IIc was also obtained. The number average degree of polymerization of this styrene polymer was 4.1,
Further, the average particle diameter of the resin dispersed in this resin composition was less than 0.001 μm.

Reference Example 4 (Production of thermoplastic resin IId) Thermoplastic resin [d] was produced by ordinary grafting washing as follows.

That is, 950 g of the ethylene/glycidyl methacrylate copolymer used in Reference Example 1 and a mixed solution of dicumyl peroxide [trade name: Bark Mill DJ (manufactured by NOF N) 0.59] dissolved in 50 g of vinyl acetate were subjected to high-speed shearing. Mix in a mixer for 5 minutes at room temperature, then mix in an extruder for 200
A thermoplastic resin was obtained by extruding at ℃ and causing a grafting reaction. This thermoplastic resin was examined using an electron microscope.
As a result of IJ observation, it was not a multi-phase structure but a single-phase structure.

Reference Example 2 (Manufacture of Blend Product) 30 mm% of polymethyl methacrylate [trade name Niacrivet MDJ (manufactured by Mitsubishi Rayon ■) was blended with the epoxy group-containing ethylene copolymer used in Reference Example 1,
Mixing was carried out under melting conditions at 250°C. As a result of observing this blend using an electron microscope, it was found that the dispersed particles of polymethyl methacrylate had a particle diameter much larger than 10 μm.

Examples 1 to 6 The amount of PET with an intrinsic viscosity of 2.2 dl/9 was changed as shown in Table 1, and the multiphase structure thermoplastic resin shown in Table 1 was used.
Plastomill was prepared by adding various carboxylic acids or carboxylic acid metal salts, tri-blending, and setting the temperature at 250°C.
The mixture was mixed using a shaft extruder (newly manufactured by Toyo Seiki Seisakusho). Regarding this composition, a differential calorimeter (DS manufactured by Perkin Elma)
G-1 type) was used to measure the crystallization temperature.

A high temperature and a sharp exothermic curve indicate a fast crystallization rate.

In addition, this composition was molded in an injection molding machine set at 250°C.
A flat plate of 00 aa

(III) Izot impact value (with notch) JIS
K7110 (2) Surface gloss (visual observation) 0: No surface roughness, good gloss 67 Slight surface roughness, slightly poor gloss ×: Significant surface roughness, significantly poor gloss The results are shown in Table 1.

(Hereinafter, blank space) Samples were prepared according to Examples 1 to 6 with respect to the compositions shown in Table 2 of Table 2, and the same tests were conducted.

The results are shown in Table 2.

(The following is a blank space) The exothermic curves of the Examples were all sharper than those of Comparative Examples 1 to 5. Although Comparative Example 6 has a high crystallization rate, mechanical properties and surface gloss are not improved. Furthermore, it is clear that in the compositions (Comparative Examples 1 to 4) that do not use the multiphase thermoplastic resin specified in the present invention, the crystallization rate is slow and the mechanical properties and surface gloss are not improved.

Examples 7 and 8: Samples were prepared according to Examples 1 to 6 with the compositions shown in Table 3, replacing the Shoto λL PE knife with PBT, and the same tests were conducted for the Fizotte impact value and surface gloss. I did it. The results are shown in Table 3.

(Margin below) As is clear from the results in Table 3, Examples 7 and 8 had good surface gloss even when the reinforcing material was added, whereas the multiphase structure heat IITJ specified by the present invention! ! ! Comparative Examples (7 to 10) in which no synthetic resin was used had poor surface gloss and poor mechanical properties. Moreover, even if m of the carboxylic acid is too small (Comparative Example 11), a product with excellent surface gloss as in the present invention cannot be obtained.

[Effects of the Invention] The thermoplastic polyester composition of the present invention uses a specific multiphase thermoplastic resin and a carboxylic acid or a metal salt of a carboxylic acid in combination. The resulting molded product has excellent mechanical properties and surface gloss.

Patent applicant: Nippon Ishiura Chemical Co., Ltd. outside given name

Claims (1)

[Claims] (I) Thermoplastic polyester 50-99% by weight (II)
5 to 95 parts by weight of an ethylene copolymer consisting of ethylene and an unsaturated glycidyl group-containing monomer and 95 to 95 parts by weight of a vinyl (co)polymer obtained from at least one vinyl monomer
5 parts by weight, and one (co)polymer has a particle size of 0.5 parts by weight.
50 to 1% by weight of a multiphase thermoplastic resin forming a dispersed phase of 0.001 to 10 μm and 100 parts by weight of the above (I) + (II),
(III) Carboxylic acid or metal salt of carboxylic acid 0.1~
A thermoplastic polyester composition comprising 10 parts by weight.