JPH0552338B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a novel polyphenylene ether resin composition that has excellent mechanical strength, solvent resistance, oil resistance, and moldability. Nylene ether and (b) polyester resin and (c)
It relates to a resin composition containing a phenoxy resin and (d) unsaturated carboxylic acids. [Prior Art] Polyphenylene ether is a resin with excellent heat resistance, rigidity, electrical properties, etc., and is a polymeric material useful as an engineering plastic. However, it is well known that polyphenylene ether has major drawbacks such as poor solvent resistance and oil resistance, and poor moldability. As a technology for improving the moldability of polyphenylene ether, that is, its flow characteristics, a technology for blending polystyrene resin was published in the U.S. Patent No.
3383435 also discloses a technique for blending a copolymer of a rubber-reinforced styrene compound and an α,β-unsaturated dicarboxylic acid anhydride.
-Disclosed in Publication No. 128947. However, these techniques do not improve the solvent resistance and oil resistance of polyphenylene ether at all. On the other hand, JP-A-49-50050 discloses a technique for improving the moldability, that is, the melt flowability, of polyphenylene ether by blending a polyester resin with the polyphenylene ether.
However, according to the study conducted by the present inventors, although the blending of polyester resin certainly improves the melt flowability of polyphenylene ether,
It has become clear that when polyester resin is blended in an amount that accounts for 20% or more by weight of the composition, the inherent mechanical strength, especially tensile strength, of polyphenylene ether is significantly impaired. . The resin composition thus obtained is not a material that can withstand practical use. Furthermore, when a polyester resin is blended with polyphenylene ether, the solvent resistance of the polyphenylene ether is improved, but the degree of improvement in solvent resistance is proportional to the amount of polyester resin blended. Therefore, if the intention is to provide sufficient solvent resistance, a large amount of polyester resin must be blended, and as mentioned above, such blending results in a decrease in the mechanical strength of the resulting resin composition. This will lead to undesirable results. In any case, the phenomenon that the mechanical strength of polyphenylene ether is impaired when a polyester resin is blended with polyphenylene ether is due to poor compatibility between polyphenylene ether and polyester resin. [Problems to be Solved by the Invention] By the way, the present inventors have first blended polyester resin and phenoxy resin into polyphenylene ether, thereby achieving excellent mechanical strength and solvent resistance. We discovered a resin composition with well-balanced physical properties that also has good moldability and filed a patent application (Japanese Patent Application No. 59-2274), but even in such a resin composition, the mechanical properties are not necessarily at a level that is practically satisfactory. It's hard to say that there is. An object of the present invention is to improve the solvent resistance and oil resistance of polyphenylene ether, improve moldability, and find a resin composition that has particularly excellent mechanical strength. [Means for Solving the Problems] The present invention achieves the above object by combining (a) polyphenylene ether, (b) polyester resin, (c) phenoxy resin, and (d) mono- or polyester resin having double bonds. A resin composition comprising at least one unsaturated carboxylic acid selected from carboxylic acids, their acid anhydrides, and their carboxylic acid ester derivatives, the resin composition comprising (b)
The total amount of the polyester resin, (c) phenoxy resin, and (d) unsaturated carboxylic acids accounts for 5 to 95% by weight in the resin composition, and (b) the polyester resin, (c) phenoxy resin, and (d) unsaturated carboxylic acids Based on the total amount of saturated carboxylic acids, (b) polyester resin is 10 to 89%, (c) phenoxy resin is 1 to 80% by weight, and (d) unsaturated carboxylic acids are
It is a resin composition with excellent solvent resistance and mechanical strength, which accounts for 0.5 to 89% by weight. (a) Polyphenylene ether used in the resin composition of the present invention refers to polyphenylene ether obtained by polycondensing one or more monocyclic phenols represented by the general formula (); (Here, R ₁ is a lower alkyl group having 1 to 3 carbon atoms,
R ₂ and R ₃ are a hydrogen atom or a lower alkyl group having 1 to 3 carbon atoms. ) Includes a graft copolymer having polyphenylene ether as its core, which is obtained by graft polymerizing a vinyl aromatic compound to nylene ether. This polyphenylene ether may be a homopolymer or a copolymer. Examples of the monocyclic phenol represented by the general formula () include 2,6-dimethylphenol, 2,6-diethylphenol, 2,6-dipropylphenol, 2-methyl-6-ethylphenol, 2- Methyl-6-propylphenol,
2-ethyl-6-propylphenol, m-cresol, 2,3-dimethylphenol, 2,3-
Diethylphenol, 2,3-dipropylphenol, 2-methyl-3-ethylphenol, 2-
Methyl-3-propylphenol, 2-ethyl-
3-methylphenol, 2-ethyl-3-propylphenol, 2-propyl-3-methylphenol, 2-propyl-3-ethylphenol,
2,3,6-trimethylphenol, 2,3,6
-triethylphenol, 2,3,6-tripropylphenol, 2,6-dimethyl-3-ethylphenol, 2,6-dimethyl-3-propylphenol, and the like. Examples of polyphenylene ether obtained by polycondensation of one or more of these phenols include poly(2,6-dimethyl-1,4-phenylene) ether and poly(2,6-diethyl-1,4-phenylene) ether. -phenylene)ether, poly(2,6-dipropyl-
1,4-phenylene) ether, poly(2-methyl-6-ethyl-1,4-phenylene) ether, poly(2-methyl-6-propyl-1,4-
phenylene)ether, poly(2-ethyl-6-
Propyl-1,4-phenylene)ether, 2,
6-dimethylphenol/2,3,6-trimethylphenol copolymer, 2,6-dimethylphenol/2,3,6-triethylphenol copolymer, 2,6-diethylphenol/2,3,6-
Trimethylphenol copolymer, 2,6-dipropylphenol/2,3,6-trimethylphenol copolymer, poly(2,6-dimethyl-1,4
-phenylene) ether, a graft copolymer obtained by graft polymerizing styrene onto a 2,6-dimethylphenol/2,3,6-trimethylphenol copolymer, and the like. In particular, poly(2,6-dimethyl-1,4-phenylene) ether, 2,6-
A dimethylphenol/2,3,6-trimethylphenol copolymer and a graft copolymer obtained by graft-polymerizing each of the former with styrene are preferred as the polyphenylene ether used in the present invention. The polyester resin (b) used in the resin composition of the present invention refers to a high molecular weight thermoplastic resin having an ester bond in the main chain of the molecule. Polycondensation products obtained from alcohols or dihydric phenol compounds; Polycondensation products obtained from dicarboxylic acids or their derivatives and cyclic ether compounds; Polycondensation products obtained from metal salts of dicarboxylic acids and dihalogen compounds; Cyclic esters Examples include ring-opening polymers of compounds. Here, the dicarboxylic acid derivative refers to an acid anhydride, an esterified product, or an acid chloride. Dicarboxylic acids may be aliphatic or aromatic, and aromatic dicarboxylic acids include, for example, terephthalic acid, isophthalic acid, phthalic acid, chlorophthalic acid, nitrophthalic acid, p-
Carboxylphenyl acetic acid, p-phenylene diacetic acid, m-phenylene diglycolic acid, p-phenylene diglycolic acid, diphenyl diacetic acid, diphenyl-p, p'-dicarboxylic acid, diphenyl-m,
m'-dicarboxylic acid, diphenyl-4,4'-diacetic acid, diphenylmethane-p,p'-dicarboxylic acid,
diphenylethane-m,m'-dicarboxylic acid, stilbene dicarboxylic acid, diphenylbutane-p,
p'-dicarboxylic acid, benzophenone-4,4'-dicarboxylic acid, naphthalene-1,4-dicarboxylic acid, naphthalene-1,5-dicarboxylic acid, naphthalene-2,6-dicarboxylic acid, naphthalene-2,
7-dicarboxylic acid, p-carboxyphenoxyacetic acid, p-carboxyphenoxybutyric acid, 1,2
-diphenoxypropane-p,p'-dicarboxylic acid, 1,3-diphenoxypropane-p,p'-dicarboxylic acid, 1,4-diphenoxybutane-p,
p'-dicarboxylic acid, 1,5-diphenoxypentane-p,p'-dicarboxylic acid, 1,6-diphenoxyhexane-p,p'-dicarboxylic acid, p-(p-
carboxyphenoxy)benzoic acid, 1,2-bis(2-methoxyphenoxy)-ethane-p,p'-dicarboxylic acid, 1,3-bis(2-methoxyphenoxy)propane-p,p '-Dicarboxylic acid, 1,4
-bis(2-methoxyphenoxy)-butane-p,
Examples of aliphatic dicarboxylic acids include p'-dicarboxylic acid, 1,5-bis(2-methoxyphenoxy)-3-oxapentane-p,p'-dicarboxylic acid, and aliphatic dicarboxylic acids such as Examples include oxalic acid, succinic acid, adipic acid, corkic acid, mazelaic acid, sebacic acid, dodecanedicarboxylic acid, undecanedicarboxylic acid, maleic acid, fumaric acid, and the like. Examples of preferred dicarboxylic acids are aromatic dicarboxylic acids, and more preferred are terephthalic acid, isophthalic acid, and phthalic acid. Examples of dihydric alcohols include ethylene glycol, propylene glycol, trimethylene glycol, butane-1,3-diol, butane-1,4-diol, 2,2-dimethylpropane-1,3-diol, cis-2 -butene-1,4
-diol, trans-2-butene-1,4-diol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, heptamethylene glycol, octamethylene glycol, decamethylene glycol, and the like. Examples of preferred dihydric alcohols are ethylene glycol, propylene glycol, trimethylene glycol, butane-1,4-diol or butane-1,3-diol, more preferably ethylene glycol and butane-1,4-diol. Mention may be made of diols. Examples of divalent phenol compounds include hydroquinone, resorcinol, bisphenol A, and the like. Examples of the cyclic ether compound include ethylene oxide and propylene side, and examples of the cyclic ester compound include δ-
Valerolactone and ε-caprolactone can be mentioned. The dihalogen compound to be reacted with the dicarboxylic acid metal salt refers to a compound obtained by replacing two hydroxyl groups of the dihydric alcohol or dihydric phenol compound with halogen atoms such as chlorine or bromine. The polyester resin used in the resin composition of the present invention may be manufactured by a known method using the above-mentioned raw materials. −
The methods taught in Publication No. 2594 and other known documents are employed. The phenoxy resin (c) used in the resin composition of the present invention refers to a polycondensate of epichlorohydrin and bisphenol A or its nuclear substituted product, and consists of a structural unit represented by the following general formula (). (In the formula, X ₁ to _{X 8} may be the same or different and represent a hydrogen atom; a lower alkyl group such as a methyl group or an ethyl group; or a halogen atom such as chlorine or bromine.) The phenoxy resin preferably used in the invention is a polymer containing 70 or more structural units represented by the formula (), and a more preferable phenoxy resin is derived from epichlorohydrin and bisphenol A, and is a polymer containing 70 or more structural units represented by the formula (). The structural unit
It is a polymer containing 70 or more. Such a phenoxy resin can be produced by condensing bisphenol A or its nuclear substituted product with epichlorohydrin in the presence of an alkali such as caustic soda. Regarding this production method, for example, U.S. Pat. number or the same
3305528, which are incorporated by reference. Furthermore, the unsaturated carboxylic acids (d), which is another component used in the resin composition of the present invention, refers to mono- or polycarboxylic acids having double bonds, their anhydrides, and their ester derivatives. , refers to unsaturated mono- or polycarboxylic acids having both a carbon-carbon double bond and a carboxyl group, their anhydrides, and esters derived from the above-mentioned unsaturated mono- or polycarboxylic acids and aliphatic or aromatic alcohols. . Specifically, α,β-unsaturated dicarboxylic acids or their anhydrides such as maleic acid, maleic anhydride, chloromaleic acid, fumaric acid, citraconic acid, itaconic acid, etc.; and methanol, ethanol, propanol, Ester compounds derived from aliphatic or aromatic alcohols such as butanol, allyl alcohol, benzyl alcohol, phenol, etc.; acrylic acid, butenoic acid, crotonic acid, vinyl acetic acid, methacrylic acid, pentenoic acid, angelic acid, tibulin acid, 2-pentenoic acid, 3-pentenoic acid, α-ethyl acrylic acid, β
Examples include unsaturated monocarboxylic acids or their anhydrides such as methyl crotonic acid; and ester compounds derived from these and the above-mentioned aliphatic or aromatic alcohols. Preferred examples among these are maleic acid, maleic anhydride, mono- and diesters of maleic acid, acrylic acid, acrylic anhydride, acrylic esters,
Examples include methacrylic acid, methacrylic anhydride, and methacrylic esters, and more preferred examples are maleic acid, maleic anhydride, and mono- and diesters of maleic acid, and the most preferred example is maleic anhydride. In the resin composition of the present invention, (a) polyphenylene ether, (b) polyester resin, (c) phenoxy resin, and (d) unsaturated carboxylic acids can be easily mixed in any ratio, but the present invention In order to achieve this objective, the polyester resin, phenoxy resin, and unsaturated carboxylic acids should be blended in an amount that accounts for a total proportion of 5 to 95% by weight in the resin composition of the present invention. be. Regarding the mixing ratio of polyester resin, phenoxy resin, and unsaturated carboxylic acids, based on the total amount of the three, the polyester resin is 10 to 89% by weight, the phenoxy resin is 1 to 80% by weight, and the unsaturated carboxylic acid is 10 to 89% by weight. 0.5 for saturated carboxylic acids
The proportion should be in the range ~89% by weight. In preparing the resin composition of the present invention, any known method may be used to mix the composition components, polyphenylene ether, polyester resin, phenoxy resin, and unsaturated carboxylic acids. Examples include a method of melt-kneading using a roll mill, Banbury mixer, extruder, or the like. Furthermore, the order in which these four components are mixed may be either mixed at the same time, or mixed in advance with two or three components and then mixed with the remaining components. However, it is more preferable to mix the polyester resin, the phenoxy resin, and the unsaturated carboxylic acid in advance, and then mix the mixture with the polyphenylene ether. The resin composition of the present invention may optionally contain other resins; elastomers; various additives such as flame retardants, flame retardant aids, stabilizers, ultraviolet absorbers, plasticizers, and lubricants; pigments, fillers, Other ingredients may be added as appropriate. Examples of other resins include polystyrene resins, epoxy resins, polyamides, polycarbonates, polysulfones, and the like. To explain polystyrene resin in more detail, it is a resin containing at least 25% by weight or more of a structural unit represented by the following general formula () in its polymer, (In the formula, R ₄ is a hydrogen atom or a lower alkyl group,
Z represents a halogen atom or a lower alkyl group,
p is 0 or a positive integer of 1-3. ) For example, polystyrene, high-impact polystyrene, styrene-butadiene copolymer, styrene-butadiene-acrylonitrile copolymer, styrene-acrylonitrile copolymer,
Styrene/alpha-methylstyrene copolymer, styrene/maleic anhydride copolymer, impact resistant styrene/maleic anhydride copolymer, poly-
Examples include p-methylstyrene and impact-resistant poly-p-methylstyrene. Here, high-impact polystyrene includes polybutadiene,
Butadiene/styrene copolymer rubber or
Includes rubber-modified polystyrene modified with a rubber component such as EPDM. The elastomer component is an elastomer in the general sense, for example, as described in "Properties and Structures of Polymers" by AV Tobolsky.
(John Wiley & Sons, Inc., 1960) The definition adopted on pages 71 to 78 can be cited, and an elastomer is one that has a Young's modulus of 10 ⁵ to 10 ⁹ dynes/cm ² at room temperature.
(0.1-1020Kg/cm ² ). Specific examples of elastomers include A-B-A' type elastomeric block copolymers, A-B-A' type elastomeric block copolymers in which the double bond in the polybutadiene portion is hydrogenated, polybutadiene,
Polyisoprene, copolymer of diene compound and vinyl aromatic compound, nitrile rubber, ethylene-propylene copolymer, ethylene-propylene-diene copolymer (EPDM), thiokol rubber, polysulfide rubber, acrylic acid rubber, polyurethane rubber, butyl rubber and polyethylene grafts,
Examples include polyester elastomer and polyamide elastomer. Particularly desirable are A-B-A' type elastomeric block copolymers. The terminal block A of this block copolymer and
A' is a polymerized vinyl aromatic hydrocarbon block, B is a polymerized conjugated diene block or a conjugated diene block in which most of the double bonds are hydrogenated, and the molecular weight of the B block is the same as that of A and B.
It is desirable that the molecular weight is greater than the combined molecular weight of the A' block. terminal block A and
A' may be the same or different, and the block is a thermoplastic homopolymer or copolymer derived from a vinyl aromatic compound in which the aromatic moiety may be monocyclic or polycyclic. Examples of such vinyl aromatic compounds include styrene, alpha-methylstyrene, vinyltoluene, vinylxylene, ethylvinylxylene, vinylnaphthalene and mixtures thereof. Central block B is an elastomeric polymer derived from conjugated diene hydrocarbons such as 1,3-butadiene, 2,3-dimethylbutadiene, isoprene and 1,3-pentadiene and mixtures thereof. Each terminal block A
and A′ preferably have a molecular weight of about 2000 to about
100,000, while the molecular weight of central block B preferably ranges from about 25,000 to about 1,000,000. Examples of the various additives mentioned above include flame retardants such as triphenyl phosphate, tricresyl phosphate, phosphate obtained from a mixture of isopropyl phenol and phenol, and difunctional additives such as benzohydroquinone or bisphenol A. phosphoric acid esters such as phosphates obtained from natural phenols and other alcohols or phenols; brominated esters such as decabromobiphenyl, pentabromotoluene, decabromobiphenyl ether, hexabromobenzene, brominated polystyrene, etc. Compounds include nitrogen-containing compounds such as cyanuric acid derivatives and melamine derivatives. Flame retardant aids may be used, examples include antimony, boron, zinc or iron compounds. Furthermore, other additives include stabilizers such as sterically hindered phenols and phosphite compounds; ultraviolet absorbers such as salicylate compounds, oxalic acid diamide compounds, and sterically hindered amine compounds; polyethylene wax, polypropylene wax, etc. Examples include lubricants such as Tux and paraffin. Furthermore, pigments exemplified by titanium oxide, zinc sulfide, and zinc oxide; glass fiber, glass beads, asbestos, wollastonite, mica, talc, clay, charcoal, magnesium hydroxide, silica, potassium titanate fiber, diatomaceous earth. , Mineral fillers exemplified by rock wool; Inorganic fillers typified by flakes of aluminum and zinc, or fibers of metals such as brass and aluminum zinc; Organic fillers typified by carbon fibers. . Furthermore, the following auxiliary agents can be added to the resin composition of the present invention in order to more effectively express the unique properties provided by the composition. Such auxiliaries include trimethylamine, triethylamine, diethylenetriamine, triethylenetetramine, dimethylaminopropylamine, N-aminoethylpiperazine, benzyldimethylamine, metaphenylenediamine, diaminodiphenylmethane, xylylenediamine, ethylmethylimidazole, Organic bases such as enylimidazole, 2-phenyl-4-methyl-5-hydroxymethylimidazole; dodecylsuccinic anhydride, hexahydrophthalic anhydride,
Examples include organic acids such as methylnadic anhydride, pyromellitic anhydride, and benzophenonecarboxylic anhydride; peroxides such as benzoyl peroxide, dicumyl peroxide, and tert-butyl peroxide. [Function] The resin composition of the present invention thus obtained has extremely specific properties compared to a composition in which polyphenylene ether is blended with a polyester resin or a composition in which polyphenylene ether is blended with a polyester resin and a phenoxy resin. In addition to significantly improved solvent resistance and mechanical strength, particularly tensile strength, oil resistance has also been improved. The reason why the resin composition of the present invention exhibits such a unique effect is not necessarily clear. However, for example, the Journal of Applied Polymer Science
Applied Polymer Science) Volume 23, 645-659
(1979) reported that when a mixture of a polyester resin and a phenoxy resin is heated and kneaded, a chemical bond is formed between the two resins through a transesterification reaction, and in the resin composition of the present invention, It is thought that chemical bonds are formed between the polyester resin and the phenoxy resin when they are heated and kneaded, and unsaturated carboxylic acids or polyphenylene ether are also involved, for example,
Esterification reactions between unsaturated carboxylic acids and hydroxyl groups of phenoxy resins, radical reactions between unsaturated bonds of unsaturated carboxylic acids bonded to phenoxy resins and methyl groups of polyphenylene ether, and furthermore, When saturated dicarboxylic acids are used, reactions such as bonding due to esterification between the terminal hydroxyl group of polyphenylene ether and the hydroxyl group of phenoxy resin are thought to occur, and as a result, polyphenylene ether, polyester resin, phenoxy resin, and unsaturated It is understood that a blend state not seen in conventional compositions was formed between the resin composition and the carboxylic acids, and the above-mentioned unique effects were produced in the resin composition of the invention. [Example] The resin composition of the present invention will be explained below with reference to Examples and Comparative Examples. Example 1 Polybutylene terephthalate (hereinafter referred to as “PBT”)
It is abbreviated as. Manufactured by Mitsubishi Rayon Co., Ltd., with a melting point of approximately 230℃ measured by DSC, grade name "N-
It is a condensate of 41.1 parts by weight of phenoxy resin (bisphenol A and epichlorohydrin) and has a solution viscosity of about 5500 cp and a molecular weight of 29000 when measured in a MEK solution with a solid content concentration of 40% by weight.
It is commercially available from Union Carbide Company under the trade name ``Phenoxy Resin'' and the grade name ``PKHH.'' ) A mixture of 4.6 parts by weight and 2.3 parts by weight of maleic anhydride was melted at 200-260°C using an extruder.
Mixed and pelletized. The intrinsic viscosity measured at 25°C using 48 parts by weight of the obtained pellets and chloroform as a solvent was 0.52 (dl/
g) 2,6-dimethylphenol/2,3,6
-Trimethylphenol copolymer (2,3,6-
The proportion of trimethylphenol is 5 mol%)
32 parts by weight and 20 parts by weight of glass fiber (manufactured by Asahi Fiber Glass Co., Ltd., grade name "CSO ₃ MA429-1") were again melted and kneaded at 280°C using an extruder (as a result, the composition was in parts by weight). (Polyphenylene ether/PBT/Phenoxy resin/Maleic anhydride/Glass fiber = 32/41.1/4.6/2.3/20) was extruded to obtain pellets. From the thus obtained pellets, an injection molding machine was used to mold 1. /8 inch thick dumbbell test pieces were molded and the tensile strength was measured.In order to determine the solvent resistance, the chloroform insoluble content was determined from the pellets using a Soxhlet extractor.The results are shown in Table 1. As can be seen from the table, the amount of chloroform-insoluble matter is greater than the amount of polyester resin used, and the total amount of polyester resin and phenoxy resin, as well as the total amount of polyester resin, phenoxy resin, and polyphenylene ether. Since components other than the polyester resin are soluble in chloroform, the above results indicate that chemical bonds occur between the polyester resin and other resin components,
This can be understood to mean that it contributed to the improvement of solvent resistance. Comparative Example 1 Maleic anhydride was removed from the composition of Example 1,
Example 1 was repeated except that the PBT was changed to 43.2 parts by weight and the phenoxy resin was changed to 4.8 parts by weight. The results are shown in Table-1. Comparing the results of Example 1 and Comparative Example 1, it can be seen that the composition of the present invention has improved tensile strength and solvent resistance. Comparative Example 2 Phenoxy resin was removed from the composition of Comparative Example 1,
Comparative Example 1 was repeated except that PBT was changed to 48 parts by weight. The results are shown in Table-1. Example 2 In Example 1, 43.4 parts by weight of PBT, 2.3 parts by weight of phenoxy resin, and 2.3 parts by weight of maleic anhydride were added.
Example 1 was repeated except that parts by weight were changed. The results are shown in Table-1. Comparative Example 3 Maleic anhydride was removed from the composition of Example 2.
45.6 parts by weight of PBT and phenoxy resin
Example 2 was repeated except that the amount was changed to 2.4 parts by weight. The results are shown in Table-1. Example 3 Using 25 parts by weight of polyphenylene ether used in Example 1, 64.3 parts by weight of polybutylene terephthalate used in Example 1, 7.1 parts by weight of phenoxy resin used in Example 1, and 3.6 parts by weight of maleic anhydride. , Example 1 was repeated with a composition without glass fibers. The results are shown in Table-1. Comparative Example 4 Maleic anhydride was removed from the composition of Example 3,
67.5 parts by weight of PBT and phenoxy resin
Example 3 was repeated except that the amount was changed to 7.5 parts by weight. The results are shown in Table-1. Example 4 The polyphenylene ether of Example 3 was added to 40 parts by weight, the PBT of Example 3 was added to 52.8 parts by weight, Example 3
Example 3 was repeated except that the phenoxy resin was changed to 4.3 parts by weight and the maleic anhydride was changed to 2.9 parts by weight. The results are shown in Table-1. Comparative Example 5 Maleic anhydride was removed from the composition of Example 4,
54 parts by weight of PBT and 6 parts of phenoxy resin
Example 4 was repeated except that parts by weight were changed. The results are shown in Table-1. Comparative Example 6 Example 3 was repeated except that maleic anhydride and phenoxy resin were removed from Example 4 and PBT was changed to 60 parts by weight. The results are shown in Table-1. Example 5 The polyphenylene ether of Example 3 was added to 75 parts by weight, the PBT of Example 3 was added to 21.4 parts by weight, Example 3
Example 3 was repeated except that the phenoxy resin was changed to 2.4 parts by weight and the maleic anhydride was changed to 1.2 parts by weight. The results are shown in Table-1. Comparative Example 7 Maleic anhydride was removed from the composition of Example 5,
22.5 parts by weight of PBT and phenoxy resin
Example 5 was repeated except that the amount was changed to 2.5 parts by weight. The results are shown in Table-1. Example 6 52.8 parts by weight of PBT of Example 4 was added to polystyrene terephthalate (manufactured by Toyobo Co., Ltd., grade name "RE500", which has a melting point of 260°C as measured by DSC,
It is abbreviated as "PET". ) 48.8 parts by weight, the phenoxy resin of Example 4 was changed to 5.6 parts by weight, and the maleic anhydride was changed to 5.6 parts by weight.
repeated. The results are shown in Table-1. Comparative Example 8 From Example 6, maleic anhydride was removed and PET was
Example 6 was repeated, except changing the amount to 50 parts by weight and the phenoxy resin to 10 parts by weight. The results are shown in Table-1.

【table】

[Table] Examples 7 to 11, Comparative Example 9 Example 4 was repeated by changing maleic anhydride to the unsaturated carboxylic acid shown in Table-2 and using the amounts shown in Table-2. Furthermore, Comparative Example 9 was conducted using a composition in which acrylic acid was removed from Example 9.

【table】

〔effect〕

As is clear from the results of Examples and Comparative Examples, it can be seen that the polyphenylene ether resin composition of the present invention exhibits even more excellent performance in mechanical strength and solvent resistance.

Claims (1)

[Claims] 1. (a) polyphenylene ether, (b) polyester resin, (c) phenoxy resin, and (d) mono- or polycarboxylic acid having a double bond, its acid anhydride, and its carboxylic acid. A resin composition comprising at least one unsaturated carboxylic acid selected from ester derivatives, wherein the total amount of (b) polyester resin, (c) phenoxy resin, and (d) unsaturated carboxylic acid is the resin composition. Monochu 5-95
(b) polyester resin accounts for 10 to 89% by weight, and (c) phenoxy 1 to 80% by weight of resin, (d) 0.5 to 89% of unsaturated carboxylic acids
% of the resin composition.