JPH0524938B2 - - Google Patents

Description

[Detailed description of the invention]

BACKGROUND OF THE INVENTION The present invention relates to polyphenylene ether compositions, particularly polyphenylene ether compositions with improved moldability. Polyphenylene ether has excellent electrical and mechanical properties, a high heat distortion temperature, and self-extinguishing properties, and is attracting attention as an extremely useful engineering plastic material. However, it has low impact strength and is somewhat brittle. Furthermore, this resin has a high melting temperature and high melt viscosity, so
During molding, high molding temperatures and pressures are required, making molding by melting difficult. As one method for improving the moldability of polyphenylene ether, attempts have been made to blend it with other resins. For example, JP-A-43-17812
The publication describes blending a high impact polystyrene resin with polyphenylene ether. Although this composition has improved moldability and impact resistance, it is said that the moldability is still insufficient. Another method to improve the moldability of polyphenylene ether is to add a plasticizer to polyphenylene ether.
For example, Japanese Patent Publication No. 49-5220 describes an aromatic organic acid ester having good compatibility with polyphenylene ether resin, a polyester having an aromatic group, an organic phosphate ester having an aromatic group, and It has been shown that moldability can be improved by blending a compound selected from chlorinated aromatic hydrocarbons into polyphenylene ether or a composition of polyphenylene ether and styrenic resin. However, when a plasticizer (for example, an organic phosphate ester having an aromatic group) is blended with polyphenylene ether or a composition of polyphenylene ether and styrene resin, moldability is improved, but performance will be significantly reduced. this is,
Because the blended plasticizer is extremely uniformly dispersed (molecularly dispersed) in a matrix made of polyphenylene ether or a composition of polyphenylene ether and styrene resin, the glass transition temperature (Tg) of the matrix is ) is considered to decrease, resulting in a decrease in heat resistance. The present inventors considered that it is desirable for the additive to have the following properties in order to suppress this decrease in thermal performance (heat resistance) and improve moldability (fluidity). (1) Under the fluid state of the molded product or system, it must have good compatibility with matrix components and exhibit the same fluidity-improving effect as a plasticizer. (2) During use, i.e. under flow stopped conditions (matrix
(temperature range below Tg), it should phase separate from the matrix components and do not lower the Tg of the matrix. However, in order to prevent a decrease in mechanical strength, the interfacial adhesive force with the matrix must be strong to a certain extent even when phase separation occurs, and the material must have affinity with the matrix. The present inventors have arrived at the present invention as a result of intensive studies from this viewpoint. [] Summary of the invention The present invention provides polyphenylene ether, or
The object of the present invention is to provide a means for improving the moldability of a composition of polyphenylene ether and styrene resin. That is, the present invention is made by mixing polyphenylene ether or a composition of polyphenylene ether and styrene resin with an amide compound represented by the following formula, and the amide compound is mixed with respect to 100 parts by weight of the polymer. The object of the present invention is to provide a polyphenylene ether composition with improved moldability, characterized in that the amount of polyphenylene ether is 0.5 to 20 parts by weight. R(-CONH ₂ ) _o R: An aromatic hydrocarbon residue having 6 to 20 carbon atoms, or a derivative residue thereof substituted with the following substituent. -NO ₂ n: 1 or 2 [] Specific description of the invention (1) Polyphenylene ether The polyphenylene ether used in the present invention has the general formula The ether oxygen atom of one unit is connected to the benzene nucleus of the next adjacent unit, n is at least 50, and Q is each independently hydrogen, halogen, Hydrocarbon groups containing no tertiary α-carbon atoms, halohydrocarbon groups having at least two carbon atoms between the halogen atom and the phenyl nucleus, hydrocarbonoxy groups and between the halogen atom and the phenyl nucleus Indicates a monovalent substituent selected from the group consisting of halohydrocarbonoxy groups having at least 2 carbon atoms. Typical examples of polyphenylene ether include poly(2,6-dimethyl-1,4-phenylene) ether, poly(2,6-diethyl-
1,4-phenylene) ether, poly(2-methyl-6-ethyl-1,4-phenylene) ether, poly(2-methyl-6-propyl-1,
4-phenylene) ether, poly(2,6-dipropyl-1,4-phenylene) ether, poly(2-ethyl-6-propyl-1,4-phenylene) ether, poly(2,6-dibutyl-
1,4-phenylene)ether, poly(2,6
-dipropenyl-1,4-phenylene) ether, poly(2,6-dilauryl-1,4-phenylene) ether, poly(2,6-dimethoxy-1,4-phenylene) ether, poly(2,
6-diethoxy-1,4-phenylene) ether, poly(2,6-diethoxy-1,4-phenylene) ether, poly(2-methoxy-6-
Ethoxy-1,4-phenylene)ether, poly(2-ethyl-6-stearyloxy-1,
4-phenylene) ether, poly(2,6-dichloro-1,4-phenylene) ether, poly(2-methyl-6-phenyl-1,4-phenylene) ether, poly(2,6-dibenzyl-
1,4-phenylene) ether, poly(2-ethoxy-1,4-phenylene) ether, poly(2-chloro-1,4-phenylene) ether,
Poly(2,5-dipromo-1,4-phenylene) ether and the like. Also, 2,6-dimethylphenol and 2,3,
Copolymer of 6-trimethylphenol, 2,6
-Copolymers such as a copolymer of dimethylphenol and 2,3,5,6-tetramethylphenol and a copolymer of 2,6-diethylphenol and 2,3,6-trimethylphenol can also be mentioned. . Furthermore, the polyphenylene ether used in the present invention is a polyphenylene ether defined by the above general formula and a styrene monomer (for example,
It also includes modified polyphenylene ethers such as those grafted with styrene, p-methylstyrene, α-methylstyrene, etc.). Methods for producing polyphenylene ethers corresponding to the above are known, for example, in US Pat.
Specifications of No. 3306874, No. 3306875, No. 3257357, and No. 3257358 and Japanese Patent Publication No.
No. 52-17880 and Japanese Patent Application Laid-Open No. 50-51197. A group of polyphenylene ethers preferred for the purposes of the present invention are those with alkyl substituents in the two positions ortho to the ether oxygen atom and those with 2,6-dialkylphenols and 2,6-dialkylphenols.
Copolymers of 3,6-trialkylphenol and also graft polymers obtained by grafting styrene monomers onto these polyphenylene ether skeletons. (2) Styrenic resin The styrene resin used in the present invention includes homopolymers such as polystyrene, poly-α-methylstyrene, and poly-p-methylstyrene, butadiene rubber, styrene-butadiene copolymer, and ethylene-propylene. copolymers, high-impact polystyrene modified with various rubbers such as ethylene-propylene-dienterpolymers, styrene-butadiene copolymers, styrene-maleic anhydride copolymers, styrene-acrylonitrile copolymers, styrene-butadiene copolymers,
Examples include acrylonitrile-butadiene copolymer, styrene-methyl methacrylate copolymer, etc., and these styrene resins are mixed in a proportion of 0 to 2000 parts by weight with respect to 100 parts by weight of polyphenylene ether resin. (3) Addition of other polymers Other polymers can be added to polyphenylene ether or a composition of polyphenylene ether and styrene resin for the purpose of improving impact resistance. The added polymers include natural or synthetic rubber-like elastomeric polymers, such as natural rubber, polyisoprene, polyptadiene, copolymers of styrene and conjugated dienes such as butadiene (including block copolymers), Ethylene-propylene copolymers, ethylene-propylene-nonconjugated diene terpolymers, etc. can be used. In addition, a polymer that has been given sensitivity by introducing a polar group can also be used. In addition to using a polymer that has been given sensitivity to a rubber-like elastic polymer, polyethylene, ethylene-vinyl acetate copolymer,
It is also possible to use a polymer obtained by imparting sensitivity to a polyolefin polymer such as polypropylene. As a means of imparting sensitivity, it is possible to graft an unsaturated organic acid or its anhydride (for example, acrylic acid, methacrylic acid, maleic acid, itaconic acid, or anhydride thereof) or an unsaturated silane compound to the above polymer. This can be done by Furthermore, a polymer imparted with sensitivity can also be obtained by block or random polymerization of ethylene with a vinyl monomer or vinyl silane having a polar group such as an unsaturated organic acid such as acrylic acid or an ester thereof. . When using rubber-modified polystyrene, the amount of the rubber-like elastic polymer or the polymer imparted with sensitivity is such that the total amount including the rubber content derived from it is 0.5 to 50% by weight based on the total amount of all polymer components. %, preferably about 2 to 40% by weight. Further, when using a polymer imparted with sensitivity, it is preferable to add an inorganic filler. When a sensitized polymer and an inorganic filler are used together, the sensitized polymer is dispersed in the matrix of polyphenylene ether or a composition of polyphenylene ether and styrene resin, imparting sensitivity. A special structure is formed in which inorganic fillers are selectively filled in the polymer, and excellent physical properties such as mechanical strength can be obtained. As the inorganic filler, inorganic powders known as fillers for synthetic resins, such as titanium oxide, zinc oxide, talc, clay, calcium carbonate, and silica, can be used. The average particle size of the inorganic filler is preferably about 0.05 to 1.0μ, and it is 0.5 to 60% by weight, preferably 1 to 60% by weight, based on the entire composition obtained by mixing.
45% by weight is used. Furthermore, as other polymers, polyphenylene ether or polyolefin graft-polymerized with a styrene resin can also be used. Polyphenylene ether graft polyolefin is a glycidylated polyphenylene ether obtained by reacting with epichlorohydrin.
Polyolefins having a carboxyl group or acid anhydride group in the main chain or side chain, such as ethylene/acrylic acid copolymer, ethylene/methacrylic acid copolymer, maleic anhydride-modified polypropylene, maleic anhydride-modified polyethylene, maleic anhydride-modified ethylene - Can be obtained by grafting onto vinyl acetate copolymer, etc. In addition, polyphenylene ether grafted polyolefins are polyolefins having glacidyl groups in their side chains, such as ethylene/glycidyl methacrylate copolymers, ethylene/vinyl acetate copolymers, etc.
It can also be obtained by grafting polyphenylene ether onto a glycidyl methacrylate copolymer or the like. Polystyrene-grafted polyolefins include styrene-based copolymers having a carboxylic acid group or cyclic acid anhydride group in the main chain or side chain of polystyrene, such as styrene/maleic anhydride copolymer, styrene/citraconic anhydride copolymer, etc. Coalescence, styrene/itaconic anhydride copolymer, styrene/asconitic anhydride copolymer,
Styrene/acrylic acid copolymer, styrene/methacrylic acid copolymer, etc. are combined with polyolefins having a glycidyl group in the side chain, such as ethylene/glycidyl methacrylate copolymer, ethylene/vinyl acetate/glycidyl methacrylate copolymer, etc. It can be obtained by grafting. The amount added is based on the total amount of polyphenylene ether, or the composition of polyphenylene ether and styrene resin, and the polyphenylene ether grafted polyolefin and/or polystyrene grafted polyolefin.
0.1 to 50% by weight, preferably 1 to 30% by weight of polyphenylene ether grafted polyolefin;
Polystyrene graft polyolefin 1-80
% by weight, preferably in the range from 1 to 30% by weight. The grafted polyolefin can be added after graft polymerization in advance, but when using a polyolefin having a glycidyl group, it can be added to a polyphenylene ether or a styrene resin having a carboxylic acid or its anhydride group. The graft reaction can be carried out by kneading at a high temperature of .degree. C. or higher. Therefore, by kneading a composition of glycidyl group-containing polyolefin and polyphenylene ether or polyphenylene and styrene resin at high temperature, each component is mixed uniformly, and at the same time, as the grafting reaction progresses, A composition containing the produced polyphenylene ether graft polyolefin and/or polystyrene graft polyolefin can be obtained all at once,
This is the most preferable method from an economical point of view. (4) Amide compound The amide compound used in the present invention is represented by the following formula. R(-CONH ₂ ) _o R: An aromatic hydrocarbon residue having 6 to 20 carbon atoms, or a derivative residue thereof substituted with the following substituent. _-NO2n :1 or 2R includes, for example, a phenyl group, a naphthyl group, a biphenyl group, and the like. The compound of the present invention is intended to be compatible with the matrix component under the fluid state during molding, and crystallize and phase separate from the matrix component when used. Therefore, it is desirable that the melting point of the amide compound of the present invention is slightly lower than the molding temperature. Generally, the molding temperature of the polyphenylene ether composition is 105-350°C, preferably 200-300°C. Therefore, the amide compound used in the present invention has a melting point of 105 to 350°C, preferably 150°C.
It is desirable that the temperature is within the range of ℃ to 300℃. However, when the molding temperature is outside the above range due to the addition of a stabilizer or plasticizer, an amide compound having a different melting point can be used accordingly. The amount added is preferably 0.5 to 20 parts by weight, preferably 2 to 10 parts by weight, per 100 parts by weight of all polymers. (5) Additives In the present invention, other additives may be used depending on the purpose. Additives include stabilizers, plasticizers, flame retardants,
There are various inorganic fillers, mold release agents, colorants, etc. The polyphenylene ether composition of the present invention has the advantage of improved fluidity, and has the advantage of being easy to mold even when other additives are added. [] Examples The present invention will be specifically explained below using examples. Example 1 Poly-2,6-dimethyl-1,4-phenylene ether (manufactured by Mitsubishi Yuka Co., Ltd., intrinsic viscosity 0.50 in chloroform at 25°C) and high impact polystyrene (manufactured by Mitsubishi Yuka Co., Ltd., intrinsic viscosity 0.50). Number average molecular weight 55000,
Weight average molecular weight 200000, microgel content 14.5% by weight) 50 parts by weight and the following structural formula: P-nitrobenzamide (manufactured by Yamato Kagaku Co., Ltd., melting point measured with melting point meter MP-1 type; 200°C) 5
Parts by weight were melt-kneaded for 7.5 minutes at 260°C using a plastic bender. After kneading, the melt index (250℃, 10Kg load) indicating moldability (fluidity) was measured, and a specified test piece was made using a press, and the heat distortion temperature was measured (18.6Kg/cm ³ loads).
The results are shown in Table-1. Comparative Example 1 Table 1 shows the results obtained in the same manner as in Example 1 except that P-nitrobenzamide was not used. Comparative Example 2 Table 1 shows the results obtained in the same manner as in Example 1, except that 5 parts by weight of triphenyl phosphate (melting point: 50°C) as a plasticizer was used in place of P-nitrobenzamide. . As is clear from Table 1, by using P-nitrobenzamide, the fluidity (moldability) is significantly improved and the decrease in heat resistance is suppressed. Although the plasticizer improves the fluidity, the heat resistance is greatly reduced, and the effect of the present invention can be understood.

[Table] Example 2 Except for using 5 parts by weight of 2-naphthamide (melting point: 192°C) in place of P-nitrobenzamide,
Table 2 shows the results obtained in the same manner as in Example 1. Example 3 2,2'-bis(carbamoyl)biphenyl (melting point: 212°C) in place of P-nitrobenzamide
Table 2 shows the results obtained in the same manner as in Example 1 except that 5 parts by weight was used.

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Claims (1)

[Scope of Claims] 1. Polyphenylene ether or a composition of polyphenylene ether and styrene resin;
The amide compound is mixed with an amide compound represented by the following formula, and the amount of the amide compound is 0.5 to 100 parts by weight of the polymer.
20 parts by weight of a polyphenylene ether composition with improved moldability. R(-CONH ₂ ) _o R: An aromatic hydrocarbon residue having 6 to 20 carbon atoms or a derivative residue thereof substituted with the following substituent. _-NO2n : 1 or 2