JPS6248753A - Thermoplastic resin composition - Google Patents

Abstract

PURPOSE:The titled composition having high heat distortion temperature, improved impact resistance and fluidity, obtained by blending specific amounts of polyglutarimide and a polyphenylene oxide-containing resin. CONSTITUTION:(A) 1-99pts.wt. polyglutarimide containing >=5wt% cyclic imide structure unit shown by the formula I(R1, R2 and R3 H, 1-20C aliphatic, aromatic, alicyclic hydrocarbon, etc.,) is blended with (B) 1-99pts.wt. polyphenylene oxide-containing resin having >=5wt% repeating unit shown by the formula II(R4 and R5 are halogen, 1-10C aliphatic, aromatic or alicyclic hydrocarbon; n is 50-5,000) in such a way that the total amount is 100pts.wt.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of industrial application) The present invention relates to a thermoplastic resin composition having a high heat distortion temperature and excellent impact resistance and fluidity. .

(Prior art) Polyglutarimide is a thermoplastic resin with excellent heat resistance, but its use as a molding material is limited due to poor mechanical strength, typified by impact resistance. That is the reality.

Until now, as a method to improve the impact resistance of polyglutarimide, ABC resin coating was used to coat polyglutarimide.
For fc, a method of adding an impact modifier such as MB8 resin has been proposed. However, when a large amount of impact modifier is added in order to obtain sufficient impact resistance, the heat distortion temperature of the resulting resin composition is lowered.

On the other hand, polyphenylene oxide has excellent mechanical properties such as impact resistance and a high heat distortion temperature, but is inferior in fluidity. For this reason, polystyrene is generally blended as the main component to improve fluidity and is used as a molding material, but the heat distortion temperature decreases and the fluidity is still insufficient.

(Problems to be Solved by the Invention) In view of the current situation, the Ministry of the Invention and others conducted extensive studies with the aim of improving the impact resistance of polyglutarimide and the fluidity of polyphenylene oxide-containing resins, and as a result, they have developed It was discovered that by mixing a specific amount of polyphenylene oxide-containing resin, a new resin composition having a high heat distortion temperature, excellent impact resistance and fluidity could be obtained, and the present invention was achieved. Means for Solving the Problems) The thermoplastic resin composition according to the present invention is characterized by comprising 1 to 99 parts by weight of polyglutarimide and 1 to 99 parts by weight of a polyphenylene oxide-containing resin (total 10 parts by weight).

The polyglutarimide used in the present invention has the formula (wherein R1+"2 and R3 are hydrogen, carbon number IT-
It contains all of the cyclic imide structural units represented by (n) aliphatic and aromatic (1 and 20 represent alicyclic hydrocarbon groups).

Any polymer may be used as long as it contains the above-mentioned cyclic imide structural unit, but R1 and R2 are hydrogen or a methyl group, and R3 is a hydrogen methyl group, ethyl group, propyl group, or butyl group. A phenyl group is generally used, in which R1 and R2 are methyl groups, and particularly preferred is where Rs is a methyl group.

Although the method for producing polyglutarimide is not particularly limited, it is useful to react the methacrylic resin and ammonia in an inert solvent in an inert gas atmosphere containing a primary amine at a temperature of 100 to 350°C. The polyglutarimide used in the present invention is preferably made to contain at least 5% by weight, preferably 20% by weight or more of the cyclic imide structural unit gold represented by the above formula (1) through an imidization reaction. . If the content of the cyclic imide structural unit is small, the resin m-acid with a high heat distortion temperature will be obtained.
hard.

The methacrylic resins used in the polyglutarimide form include, for example, methacrylic ester homopolymers or methacrylic esters and other methacrylic esters,
Examples include copolymers of acrylic esters, acrylic acid, methacrylic acid, styrene, and substituted styrenes such as α-methylstyrene.

Examples of methacrylic esters include methyl methacrylate, ethyl methacrylate, propyl methacrylate,
n-butyl methacrylate, isobutyl methacrylate, tQrt methacrylate.

Acrylic acid esters include, for example, methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, Isobutyl acrylate, tart acrylate, -butyl acrylate, cyclohexyl acrylate, norbornyl acrylate, 2-acrylate
Ethylhexyl, benzyl acrylate, etc. can be used. These monomers may be used alone or in combination of two or more.

Among these methacrylic resins, methyl methacrylate homopolymer or methyl methacrylate 25
A copolymer of X amount or more and 75% by weight or less of the above-mentioned other monomers is preferred, and a homopolymer of methyl methacrylate is particularly preferred from the viewpoint of transparency.

The polyphenylene oxide-containing resin used in the present invention has the formula (wherein R4 and R5 are halogen atoms, and has 1 to 1 carbon atoms.
0 aliphatic, aromatic or alicyclic hydrocarbon group) having a repeating unit sound, the degree of polymerization n being 50 to s,
The gold-containing polymer is a polyphenylene oxide polymer having a gold content of 100 to 1,000.

In the present invention, any resin containing a polyphenylene oxide polymer represented by formula (U) can be used, but among them, it is particularly preferable to use a resin in which R4 and RS are methyl groups. preferable.

In addition, among the polyphenylene oxide-containing resins, the polyphenylene oxide polymer of formula (II) has 5! It is preferable that the content is -ft or more, and it is particularly preferable to blend it with polystyrene having a -95N content or less. If the content of the polyphenylene oxide polymer is less than 5% by weight, the resulting resin composition will have insufficient impact resistance and mechanical properties.

The blending ratio of polyglutarimide and polyphenylene oxide-containing resin in the resin composition of the present invention is 1 to 99 Ji of polyglutarimide and 1 to 99 parts by weight of polyphenylene oxide-containing resin (100 parts by weight in total). Preferably, the resin composition contains 10 to 80 parts by weight of polyglutarimide. In the resin composition,
If the amount of polyglutarimide is too small, the heat distortion temperature and fluidity will be insufficient, and if it is too large, the impact resistance will decrease.

The composition of the present invention can be formed by tri-blending polyglutarimide and polyphenylene oxide-containing resin and melt-extruding the mixture, or by blending the mixture using a solvent.

In the resin composition of the present invention, an antioxidant can be added to completely improve the thermal stability, or a lubricant can be added to improve the fluidity, if necessary.

Fiber reinforcing agents, inorganic fillers, coloring agents,
It is also possible to mix conductive materials, pigments and flame retardants.

(Example) Hereinafter, the present invention will be further explained with reference to Examples. In addition,
The measurement method used in the examples is as follows.

Heat distortion temperature: ASTM D-648-56 Izot impact strength: ASTM D-256-56Met
hocl A Melt Index: ASTM D I258 (2
Outflow in 10 minutes at 30℃ under a load of 10K1772:
Example of production of polyglutarimide (100 parts by weight of dried polymethacrylic methacrylate), 100 parts of dehydrated and dried toluene,
10 parts of dehydrated and dried methanol and the imidizing agent shown in Table 1 were placed in an autoclave under an indoor atmosphere.
The mixture was reacted at 230° C. for 2 hours with stirring. The obtained Kyo coalescence was placed in an extruder and extruded at a resin temperature of 260° C. while degassing through a vent hole to produce pellets.Table 1 shows the characteristics of the fL7j pellets obtained.

Table 1 Example 1 Polyglutarimide prepared as above and polyphenylene oxide-containing resin (Noryl (registered trademark) 7s 1
:R, manufactured by Engineering Plastics Co., Ltd.) and T as shown in Table 2, and then extruded through an extruder at a resin temperature of 280°C to obtain pellets of the resin composition.

A test piece was prepared by injection molding using this Bellet I injection bottom molding machine (cylinder 1 cover: 80°C, mold temperature: 80°C).
All characteristics were evaluated.

The results obtained are shown in Table 2.

Table 2 (Effects of the Invention) The resin composition of the present invention having the above-mentioned structure has a well-balanced thermal deformation temperature, impact resistance, and fluidity, so it is widely used as a molding material. It is useful for various purposes.

Procedural amendment March U, 1986

Claims (1)

[Scope of Claims] 1. A thermoplastic resin composition comprising 1 to 99 parts by weight of polyglutarimide and 1 to 99 parts by weight of a polyphenylene oxide-containing resin (100 parts by weight in total). 2. Polyglutarimide has the formula ▲Mathematical formula, chemical formula, table, etc.▼(I) (In the formula, R_1, R_2 and R_3 are hydrogen, carbon number 1
~20 aliphatic, aromatic or alicyclic hydrocarbon groups) at least 5 cyclic imide structural units represented by
% by weight of the thermoplastic resin composition according to claim 1. 3. Polyphenylene oxide-containing resin has the formula ▲Mathematical formula, chemical formula, table, etc.▼(II) (In the formula, R_4 and R_5 are halogen atoms, carbon number 1
Claim 1, characterized in that the resin contains at least 5% by weight of polyphenylene oxide having repeating units of ~10 aliphatic, aromatic or alicyclic hydrocarbon groups. thermoplastic resin composition. 4. In formula (II), polyphenylene oxide has R_
6. The thermoplastic resin composition according to claim 5, wherein R_5 and R_5 are methyl groups. 5. In formula (II), polyphenylene oxide has n
The thermoplastic resin composition according to claim 5, wherein the thermoplastic resin composition has a molecular weight of 50 to 5,000.