JP3295982B2 - Connector resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to mechanical properties, heat resistance,
The present invention relates to a resin composition for a connector having excellent moldability, particularly excellent in bending resistance (hinge characteristics), and is useful in the field of electric / electronic / electric components.

[0002]

2. Description of the Related Art Thermoplastic polyesters typified by polyethylene terephthalate and polybutylene terephthalate have excellent mechanical properties, heat resistance, chemical resistance, weather resistance, and electrical properties, and are therefore used in a wide range of fields such as automobiles, electric and electronic parts. Used in

[0003] Since thermoplastic polyesters have excellent heat resistance, they can be used continuously in a high-temperature atmosphere. However, when exposed to a high temperature for a long time, crystallization and thermal deterioration gradually progress, and the toughness is reduced. In particular, hinge characteristics are greatly reduced, and the molded product is easily broken due to bending. For this reason, at present, use is restricted in applications where bending resistance (hinge characteristics) is required.

A method of blending various kinds of aromatic polyester resins in order to improve mechanical properties and impact resistance has been proposed. In particular, JP-A-60-231775
JP-A-57-100154 discloses a method of blending an aromatic polycarbonate or a glycidyl group-containing copolymer with a polyester resin. Although a method of blending the polyester resin with a polyester resin is disclosed, there is no mention of application to a connector.

[0005]

However, although the impact resistance of the thermoplastic polyester is improved to some extent by the methods generally proposed so far, the bending resistance, especially the sufficient bending resistance at high temperatures ( Hinge characteristic).

Accordingly, an object of the present invention is to provide a resin composition for a connector which has excellent flexing resistance, particularly excellent flexing resistance even at high temperature treatment, without impairing the properties of the thermoplastic polyester.

[0007]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have reached the present invention.

That is, the present invention comprises (B) (A) an aromatic vinyl monomer and (B) a vinyl cyanide monomer per 100 parts by weight of a thermoplastic polyester. 5 to 100 parts by weight of a vinyl polymer obtained by copolymerizing a monomer mixture, and (C) an α-olefin and α,
A resin composition for a connector having a specific gravity of 1.15 to 1.25, which is obtained by mixing 1 to 50 parts by weight of a glycidyl group-containing copolymer composed of a glycidyl ester of β-unsaturated acid, and (D) the following general formula ( The above resin composition for a connector, further comprising 5 parts by weight or less of the epoxy compound of I).

[0009]

Embedded image (In the formula, Ar represents an aromatic group or an alicyclic group having 6 to 20 carbon atoms, and n represents 0 or an integer of 1 to 20.) In the present invention, a vinyl polymer and a glycidyl group-containing copolymer are added to a thermoplastic polyester. The present invention has been found that a composition having a specific gravity of a specific molded article, which is used in combination with a polymer, is extremely suitable for connector applications. And by adopting the above configuration, a synergistic effect is exhibited, and excellent properties of the thermoplastic polyester, for example, rigidity,
Bending resistance (hinge characteristics) while maintaining moldability
Is greatly improved, and various characteristics are balanced to obtain an excellent resin composition for connectors.

The thermoplastic polyester (A) used in the present invention is a polymer or a polymer obtained by a condensation reaction containing dicarboxylic acid (or an ester-forming derivative thereof) and diol (or an ester-forming derivative thereof) as main components. It is a copolymer.

The dicarboxylic acids include terephthalic acid,
Isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, bis (p-carboxyphenyl) methane, anthracenedicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid, 5-
Alicyclics such as aromatic dicarboxylic acids such as sodium sulfoisophthalic acid, aliphatic dicarboxylic acids such as adipic acid, sebacic acid, azelaic acid and dodecandioic acid, 1,3-cyclohexanedicarboxylic acid, and 1,4-cyclohexanedicarboxylic acid And dicarboxylic acids and their ester-forming derivatives. The diol component is an aliphatic glycol having 2 to 20 carbon atoms, that is, ethylene glycol, propylene glycol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol, decamethylene glycol. And long-chain glycols having a molecular weight of 400 to 6000, such as polyethylene glycol, poly-1,3-propylene glycol, polytetramethylene glycol, and ester-forming derivatives thereof.

Preferred examples of these polymers or copolymers include polybutylene terephthalate, polybutylene (terephthalate / isophthalate), polybutylene (terephthalate / adipate), polybutylene (terephthalate / sebacate), and polybutylene (terephthalate / decanedicarboxylate). Rate), polybutylene naphthalate, polyethylene terephthalate, polyethylene (terephthalate / isophthalate), polyethylene (terephthalate / adipate), polyethylene (terephthalate / 5-sodium sulfoisophthalate),
Examples thereof include polybutylene (terephthalate / 5-sodium sulfoisophthalate), polyethylene naphthalate, and polycyclohexane dimethylene terephthalate. Polybutylene terephthalate and polybutylene (terephthalate /
Adipate, polybutylene (terephthalate / decanedicarboxylate), polybutylene naphthalate, polyethylene terephthalate, polyethylene (terephthalate / adipate), polyethylene naphthalate, polycyclohexane dimethylene terephthalate and the like are particularly preferably used.

[0013] These thermoplastic polyesters are o-
Those having an intrinsic viscosity of 0.36 to 1.60, particularly 0.52 to 1.35 when the chlorophenol solution is measured at 25 ° C. are suitable from the viewpoint of mechanical properties and moldability. If the intrinsic viscosity is less than 0.36, the mechanical properties are poor, and if the intrinsic viscosity exceeds 1.60, the moldability becomes poor, and both are not preferred.

The (A) aromatic vinyl monomer in the (B) vinyl polymer of the present invention includes styrene, α-methylstyrene, p-methylstyrene, pt-butylstyrene and the like. Among them, styrene, α-methylstyrene and the like are preferable. Examples of the (b) vinyl cyanide-based monomer include acrylonitrile and methacrylonitrile, among which acrylonitrile is preferable.

(A) Aromatic vinyl monomer and (B)
The respective composition ratios of the vinyl cyanide-based monomer are (A) in the range of 50 to 90% by weight, preferably 55, from the viewpoint of chemical resistance, bending resistance (hinge characteristics), and moldability of the resulting composition. ~ 8
The content is 5% by weight, particularly preferably 70 to 80% by weight, (b) is 50 to 10% by weight, preferably 45 to 15% by weight, particularly preferably 30 to 20% by weight.

The total of the monomers (a) and (b) is 10
It is also possible to copolymerize other copolymerizable monomers in a range of 70 parts by weight or less with respect to 0 parts by weight.

Other copolymerizable monomers include methyl methacrylate, ethyl methacrylate, t-methacrylic acid.
Α, β-unsaturated carboxylic esters such as butyl, cyclohexyl methacrylate, glycidyl acrylate, and glycidyl methacrylate; anhydrides of α, β-unsaturated dicarboxylic acids such as maleic anhydride and itaconic anhydride;
Phenylmaleimide, N-methylmaleimide, Nt-
Examples thereof include imide compounds of α, β-unsaturated dicarboxylic acid such as butylmaleimide, and α, β-unsaturated carboxylic acid esters such as glycidyl methacrylate are preferable.

(B) The method for producing the vinyl polymer is not particularly limited, and ordinary methods such as bulk polymerization, solution polymerization, bulk suspension polymerization, suspension polymerization and emulsion polymerization are used.
There is no particular limitation on the method of charging the monomers, and they may be added all at once in the initial stage, and a part or all of the charged monomers may be continuously charged or divided in order to prevent formation of a composition distribution of the copolymer. The polymerization may be performed while charging.

Specific examples of the (B) vinyl polymer include styrene / acrylonitrile copolymer, α-methylstyrene / styrene / acrylonitrile copolymer, methyl methacrylate / styrene / acrylonitrile copolymer, and glycidyl methacrylate / styrene. / Acrylonitrile copolymer, maleic anhydride / styrene / acrylonitrile copolymer, N-phenylmaleimide / styrene / acrylonitrile copolymer and the like. These can be used alone or in combination of two or more. When a plurality of polymers are added, a preferable addition method is a method in which a polymer containing no group that substantially reacts with PBT and a polymer containing a group that reacts are used in combination. For example, a combination of a styrene / acrylonitrile copolymer and a glycidyl methacrylate / styrene / acrylonitrile copolymer or a maleic anhydride / styrene / acrylonitrile copolymer can be mentioned as a preferred example.

These vinyl polymers (B) are represented by A
Tensile modulus measured according to STM D882 is 4
000 kg / cm ² or more, preferably 8000 kg / c
m is preferably used ² or more.

(B) The blending amount of the vinyl polymer is 5 to 100 parts by weight, preferably 10 to 60% by weight, particularly preferably 15 to 100 parts by weight based on 100 parts by weight of the thermoplastic polyester.
If the amount is less than 5 parts by weight, the rigidity is insufficiently improved, and if the amount exceeds 100 parts by weight, the bending resistance (hinge characteristics) is impaired, and neither is preferred.

The (C) α-olefin in the glycidyl group-containing copolymer composed of α-olefin and glycidyl ester of α, β-unsaturated acid used in the present invention includes ethylene, propylene, butene-1 and the like. And glycidyl esters of α, β-unsaturated acids are compounds represented by the general formula (II).

[0023]

Embedded image (In the formula, R represents a hydrogen atom or a lower alkyl group.) Specific examples include glycidyl acrylate, glycidyl methacrylate, glycidyl ethacrylate, and glycidyl itaconate. Among them, glycidyl methacrylate can be preferably used. Α, in the glycidyl group-containing copolymer
The copolymerization ratio of the glycidyl ester of β-unsaturated acid is 0.1.
The range of 5 to 20 parts by weight, particularly 1 to 10 parts by weight, is preferred from the viewpoint of the effect of improving the bending resistance after high-temperature treatment of the molded article and the fluidity during molding.

The glycidyl esters of α, β-unsaturated acids can be copolymerized by standard copolymerization or grafting reactions. Further, if it is 40 parts by weight or less, unsaturated monomers copolymerizable with the above copolymer, ie, vinyl ethers, vinyl acetate, vinyl esters such as vinyl propionate, acrylic acid such as methyl, ethyl, propyl, and butyl; One or more methacrylic acid esters, acrylonitrile, styrene and the like may be copolymerized.

The melt flow rate (MI) of the glycidyl group-containing copolymer is 0.1 to 50, especially 1 to 20.
Is preferred from the viewpoint of the effect of improving the bending resistance.

Preferred examples of the glycidyl group-containing copolymer include ethylene / glycidyl methacrylate copolymer, ethylene / vinyl acetate / glycidyl methacrylate copolymer, ethylene / glycidyl acrylate copolymer, ethylene / vinyl acetate / acryl. And glycidyl methacrylate copolymer. Among them, ethylene / glycidyl methacrylate copolymer is most preferable.

The amount of the glycidyl group-containing copolymer (C) is 1 to 100 parts by weight of the thermoplastic polyester (A).
５０50 parts by weight, preferably 2-20 parts by weight. If the amount is less than 1 part by weight, the effect of improving the bending resistance (hinge characteristics) is not sufficient, and if it exceeds 50 parts by weight, the rigidity of the aromatic polyester tends to be impaired, and both are not preferred.

When the composition of the present invention is further incorporated with the epoxy compound of the above general formula (I), not only the flex resistance at higher temperatures is improved but also the coloring of the molded article caused when a vinyl polymer is added. The effect of suppressing is exhibited.

The epoxy compound used in the present invention is represented by the above general formula (I). Specific examples of Ar include 1,4-phenylene, 1,3-phenylene, 1,
2-phenylene, 2-methyl-1,4-phenylene,
3,3′-biphenylene, 2,2′-biphenylene,
3,4-biphenylene, 1,4-naphthylene, 1,5-
Naphthylene, 2,6-naphthylene, 2,7-naphthylene, 1,4-cyclohexylene, 1,3-cyclohexylene, 1,2-cyclohexylene, 4,4′-bicyclohexylene 2,6-decahydro Preferred are naphthylene and the like, among which 1,4-phenylene, 1,3-phenylene and 2,6-naphthylene are particularly preferred.

The value of the polymerization degree n of the compound of the formula (I) is 0 or an integer of 1 to 20, preferably 0 or an integer of 1 to 10, and even if it is a mixture of compounds having various polymerization degrees. Good. It is particularly preferred that the average degree of polymerization is in the range of 0 to 2, and the weight average molecular weight (Mw) and the number average molecular weight (M
The ratio Mw / Mn of n) is in the range of 1.02 to 3.00.

The method for producing the epoxy compound represented by the formula (I) is not particularly limited. For example, hydroxycarboxylic acid and epihalohydrin may be used in the presence of a catalyst such as a quaternary ammonium salt, a tertiary amine, or a tertiary phosphine. under,
The reaction is carried out at 40 ° C. to 150 ° C. to carry out halohydrin ester etherification, followed by addition of an alkali metal hydroxide and dehydrohalogenation for production. For those having a high degree of polymerization, the amount of the epoxy compound represented by the formula (I) in the present invention, which can be obtained by further reacting hydroxycarboxylic acid in the presence of a catalyst by appropriately changing the ratio, is a thermoplastic polyester. 100
5 parts by weight or less, preferably 0.05 to 3 parts by weight
Parts by weight, more preferably 0.2 to 1 part by weight.

The epoxy compound of the formula (I) may be added at a ratio such that the terminal carboxyl group content of the thermoplastic polyester is 30 equivalents / 10 ⁶ g-thermoplastic polyester or less. Lower flex resistance,
It is effective for improvement such as suppression of coloring of molded articles.

It is preferable that the composition of the present invention further contain an ethylene copolymer composed of ethylene and an α-olefin having 3 or more carbon atoms, because the copolymer has a further effect of bending resistance. Α having 3 or more carbon atoms in an ethylene copolymer comprising ethylene and α-olefin having 3 or more carbon atoms
-Olefin is propylene, butene-1, pentene-1, 3-methylpentene-1, octacene-1 and the like, and propylene and butene-1 can be preferably used.
The copolymerization ratio of ethylene and α-olefin having 3 or more carbon atoms is 40/60 to 99/1 (molar ratio), preferably 70/3.
The range of 0 to 95/5 (molar ratio) is preferable.

The amount of the ethylene copolymer is preferably 20 parts by weight or less, particularly 10 parts by weight or less, based on 100 parts by weight of the thermoplastic polyester, from the viewpoint of the rigidity of the molded connector.

It is preferable that the composition of the present invention further contain a polyester elastomer because it has a further effect in improving the bending resistance at high temperatures. Examples of the polyester elastomer include a polyether ester block copolymer and a polyester / ester block copolymer in which the same polyester as the thermoplastic polyester is used as a hard segment and poly (alkylene oxide) glycol and / or an aliphatic polyester is used as a soft segment. Is preferably used. Here, poly (alkylene oxide) glycol constituting the soft segment,
Specific examples of the aliphatic polyester include polyethylene glycol, poly (1,2- and 1,3-propylene oxide) glycol, and poly (tetramethylene oxide).
Preferred examples include glycol, a copolymer of ethylene oxide and tetrahydrofuran, polyethylene adipate, polybutylene adipate, poly-ε-caprolactone, polyethylene sebacate, polybutylene sebacate, and the like.

The ratio of the soft segment to the polyester hard segment in the polyester elastomer is from 95/5 to 10/90 by weight, especially from 90/10 to 30 /.
Preferably it is 70.

Specific examples of the polyester elastomer include polyethylene terephthalate / poly (tetramethylene oxide) glycol block copolymer, polyethylene terephthalate / isophthalate / poly (tetramethylene oxide) glycol block copolymer, and polybutylene terephthalate / poly ( Tetramethylene oxide)
Glycol block copolymer, polybutylene terephthalate / isophthalate / poly (tetramethylene oxide) glycol block copolymer, polybutylene terephthalate / decanedicarboxylate / poly (tetramethylene oxide) glycol block copolymer, polybutylene terephthalate Poly (propylene oxide / ethylene oxide) glycol block copolymer, polybutylene terephthalate / isophthalate / poly (propylene oxide / ethylene oxide) glycol block copolymer, polybutylene terephthalate / decanedicarboxylate / poly (propylene oxide / ethylene oxide) glycol Block copolymer, polybutylene terephthalate / poly (ethylene oxide) glycol block copolymer, Butylene terephthalate polyethylene adipate heat block copolymer, polybutylene terephthalate-polybutylene adipate heat block copolymer, polybutylene terephthalate, polybutylene sebacate block copolymer, polybutylene terephthalate
Preferable examples include a poly-ε-caprolactone block copolymer.

Among these polyester elastomers, in particular, polybutylene terephthalate / poly (tetramethylene oxide) glycol block copolymer, polybutylene terephthalate / isophthalate / poly (tetramethylene oxide) glycol block copolymer, polybutylene terephthalate / poly (butylene terephthalate) Poly (propylene oxide / ethylene oxide) glycol block copolymer, polybutylene terephthalate / isophthalate / poly (propylene oxide / ethylene oxide) glycol block copolymer, polybutylene terephthalate / polybutylene adipate block copolymer, polybutylene terephthalate / poly -Ε-Caprolactone block copolymer is preferably used.

The intrinsic viscosity of these polyester elastomers measured in the same manner as the thermoplastic polyester is preferably in the range of 0.4 to 2.0, particularly 0.5 to 1.8.

[0040] Two or more of these polyester elastomers can be used as necessary.

The compounding amount of the polyester elastomer is preferably 20 parts by weight or less, and particularly preferably 10 parts by weight or less from the viewpoint of the rigidity of the molded connector, based on 100 parts by weight of the thermoplastic polyester.

When the composition of the present invention is further incorporated with a polycarbonate, the bending resistance (hinge characteristics) can be improved.

As the polycarbonate, those obtained by producing a dihydric phenol or a derivative thereof as a raw material by a transesterification method or a phosgene method can be preferably used.

Specific examples of the dihydric phenol include bis (4-hydroxyphenyl) -methane, 1,1-bis (4-hydroxyphenyl) -ethane, and 1,2-bis (4-hydroxyphenyl) -ethane 2,2-bis (4-hydroxyphenyl) -propane, 1,1-bis (4-hydroxyphenyl) -propane, 2,2-bis (4-hydroxy-3-chlorophenyl) -propane,
32,2-bis (4-hydroxy-3,5-dichlorophenyl) -propane, 2,2-bis (4-hydroxy-
3-bromophenyl) -propane, 2,2-bis (4-
Dihydroxy-3,5-dibromophenyl) -propane, 2,2-bis (4-hydroxy-3-methylphenyl) propane, 2,2-bis (4-hydroxy-3-methoxyphenyl) -propane, 1,4 -Bis (4-hydroxyphenyl) -cyclohexane, 1,1-bis (4
-Hydroxyphenyl) -cyclohexane, 1,2-bis (4-hydroxyphenyl) -ethylene, 1,4-bis (4-hydroxyphenyl) -benzene, bis (4-
(Hydroxyphenyl) -phenylmethane, bis (4-hydroxyphenyl) -diphenylmethane, 1,1-bis (4-hydroxyphenyl) -2,2,2-trichloroethane, bis (4-hydroxyphenyl) -ketone, bis (4 -Hydroxyphenyl) -sulfide, bis (4-hydroxyphenyl) -sulfone, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxybiphenyl, 3,3'-dihydroxybiphenyl, hydroquinone, resorcinol, 2,6-dihydroxy Examples thereof include naphthalene, 2,7-dihydroxynaphthalene, and phenolphthalein, and 2,2-bis (4-hydroxyphenyl) -propane (commonly known as bisphenol A) can be preferably used. Two or more dihydric phenols may be used in combination.

The viscosity average molecular weight of the polycarbonate used in the present invention can be in the range of 5,000 to 80,000, preferably in the range of 8,000 to 50,000, and more preferably in the range of 10,000 to 40,000. Those in the range are more preferred. By using a polycarbonate in the above range, the effect of improving the bending resistance (hinge characteristics) is sufficiently exhibited, and a composition having good moldability is obtained.

The viscosity average molecular weight mentioned here can be obtained by converting the intrinsic viscosity obtained by measuring a methylene chloride solution at 20 ° C. using an Ostwald viscometer and using the following Schnell equation.

[Η] = 1.23 × 10 ⁻⁴ M ^0.83 (where [η] represents the intrinsic viscosity and M represents the viscosity average molecular weight) The amount of the polycarbonate used in the present invention is the moldability, especially the moldability. It is preferably 20 parts by weight or less from the viewpoint of the cycle. A more preferred range is 15 parts by weight or less.

The composition of the present invention may further contain other various additives within a range not to impair the object of the present invention. As these other additives, for example, reinforcing agents such as glass fiber, carbon fiber, asbestos fiber, rock wool, calcium carbonate, silica sand, bentonite, kaolin, talc, clay, walsteinite, barium sulfate, glass beads, mica and the like , Fillers, nucleating agents or antioxidants, ultraviolet absorbers, heat stabilizers, lubricants, release agents, coloring agents including dyes and pigments, flame retardants (halogen, phosphorus, etc.), flame retardant auxiliaries ( Examples include an antimony compound represented by antimony trioxide, zirconium oxide, molybdenum oxide, and the like, a foaming agent, a crosslinking agent (for example, a polyvalent epoxy compound, an isocyanate compound, and an acid anhydride). In addition, other synthetic resins (for example, polyamide, polyethylene, polypropylene, ethylene / vinyl acetate copolymer, ethylene / propylene copolymer, silicone resin, epoxy resin, ethylene / propylene terpolymer, etc.) can be contained.

The production method of the composition of the present invention is not particularly limited. For example, a thermoplastic polyester, a vinyl polymer, a glycidyl group-containing copolymer and, if necessary, a specific epoxy compound and other additives are used. A method in which the compounded raw materials are supplied to a screw-type extruder and kneaded, for example, can be appropriately adopted.

The connector resin composition of the present invention are generally formed by injection molding, the molded article is excellent Flexibility (hinge characteristic), polyamide and equal to or less than the specific gravity (specific gravity
1.15 to 1.25) can be used for connector materials and the like.

[0051]

EXAMPLES The effects of the present invention will be further described below with reference to examples.

The vinyl polymers, glycidyl group-containing copolymers and epoxy compounds used in the examples are shown in Table 1.

[0053]

[Table 1] Polybutylene terephthalate 100 of Examples 1 to 10 Comparative Examples 1 to 5 intrinsic viscosity 1.05
Relative parts by weight, a vinyl polymer shown in Table 1, a glycidyl group-containing copolymer, an epoxy compound and other additives were blended at a ratio of the amount shown in Table 1 (parts by weight), was set in 250 ° C. 30 mm? And melted and kneaded into pellets. After drying the obtained pellets at 130 ° C. for 5 hours, the bending resistance shown in FIGS. 1 and 2 was obtained at a mold temperature of 40 ° C. using a screw in-line type injection molding machine with a mold clamping pressure of 50 t set at 260 ° C. (Hinge property) Test molding and A
An STM No. 1 dumbbell test piece was molded.

After subjecting the molded product for bending resistance (hinge characteristics) to a heat treatment at 130 ° C. for 1000 hours, a repeated bending test at a bending angle of 180 ° was performed to determine the number of times to breakage and determine the bending resistance (hinge resistance). Properties) were evaluated.

Further, the ASTM No. 1 dumbbell test piece was immersed in gasoline at room temperature for 1000 hours, and then subjected to a tensile test together with the untreated test piece to evaluate mechanical properties. Also AS
Using a TM1 dumbbell test piece, the specific gravity was measured and the color tone of the appearance was compared. The results are shown in Table 2.

[0056]

[Table 2] From the results shown in Table 2, it is clear that the molded article obtained from the composition of the present invention is more suitable for connector applications because it is more excellent in flex resistance (hinge properties), mechanical properties and specific gravity than the comparative example. It is.

FIG. 1 is a plan view of a molded product for bending resistance (hinge characteristics) test, in which a bent portion 1 having a width of 2 mm is provided at a central portion having a width of 15 mm and a length of 102 mm. FIG. 2 is a cross-sectional view of the molded product. The molded product has a bent portion 1 having a thickness of 0.8 mm at the center thereof.
And bend in the direction of arrow b.

Example 11 Comparative Example 6 Using Example 11 (composition of Example 5) and Comparative Example 6 (PBT resin used in Example 1), the hinge portion (width 10 mm) was used under the same conditions as in Example 1 above. , 0.2 mm thick).

The molded connector was heat-treated at 150 ° C. and the time until the hinge portion was broken was measured.

As a result, the connector molded product obtained from the composition of the present invention did not break the hinge even after 1000 hours. The PBT resin cracked the hinge in 200 hours.

[0061]

According to the present invention, a connector molded article obtained by using the resin composition for a connector according to the present invention not only has excellent mechanical properties, heat resistance and bending resistance (hinge properties), but also has a specific gravity as compared with a conventional polyester. Since it has a light feature, it is useful for applications such as electricity, electronics, and electrical components.

[Brief description of the drawings]

FIG. 1 shows a plan view of a molded product for a bending resistance (hinge characteristic) test in an example.

FIG. 2 shows a side view of a molded product for a bending resistance (hinge characteristic) test in Examples.

[Explanation of symbols]

 1: Bend

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-100154 (JP, A) JP-A-2-140262 (JP, A) JP-A-63-284216 (JP, A) (58) Investigation Field (Int.Cl. ⁷ , DB name) C08L 67/00-67/04

Claims (2)

(57) [Claims] 1. A monomer mixture comprising (B) (A) an aromatic vinyl monomer and (B) a vinyl cyanide monomer per 100 parts by weight of a thermoplastic polyester. And 5 to 100 parts by weight of (C) a glycidyl group-containing copolymer composed of a glycidyl ester of an α-olefin and an α, β-unsaturated acid. Specific gravity of molded product 1.15
1.25 resin composition for connectors. 2. The resin composition for a connector according to claim 1, further comprising (D) an epoxy compound of the following general formula (I) in an amount of 5 parts by weight or less. (In the formula, Ar represents an aromatic group or an alicyclic group having 6 to 20 carbon atoms, and n represents 0 or an integer of 1 to 20.)