JPH0215586B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a thermoplastic resin composition having a high heat distortion temperature and excellent moldability. (Prior Art) Polyglutarimide is a thermoplastic resin with excellent heat resistance, but has poor moldability due to its low fluidity. Until now, as a method to improve the fluidity of polyglutarimide, for example,
(1) Method of adding thermoplastic polyester (JP-A-Sho
59-41355) and (2) a method of using a graft polymer in combination with a vinyl polymer containing maleic anhydride as an essential component (Japanese Unexamined Patent Publication No. 58-83058), but these methods are not satisfactory. We haven't reached that point yet. On the other hand, polyphenylene sulfide is an engineering plastic that has chemical resistance, electrical properties, and moldability, and is used in electrical and electronic parts, precision machinery, OA equipment, etc. At present, there are limitations to its applications due to the insufficient heat deformation temperature. (Problems to be Solved by the Invention) Under these circumstances, the present inventors have conducted extensive studies with the aim of improving the fluidity of polyglutarimide and the heat distortion temperature of polyphenylene sulfide under high loads. As a result, by mixing specific amounts of polyglutarimide and polyphenylene sulfide, a new resin composition that maintains the good heat distortion temperature of polyglutarimide and has excellent fluidity can be obtained. We have discovered this and arrived at the present invention. (Means for Solving the Problems) The thermoplastic resin composition according to the present invention comprises 1 to 99 parts by weight of polyglutarimide and 1 to 99 parts by weight of polyphenylene sulfide (100 parts by weight in total). Features. The polyglutarimide used in the present invention has the formula (In the formula, R ₁ , R ₂ and R ₃ are hydrogen and have 1 to 1 carbon atoms.
20 aliphatic, aromatic, or alicyclic hydrocarbon groups). Polyglutarimide may be any polymer containing the above-mentioned cyclic imide structural unit, but R ₁ and R ₂ are hydrogen or a methyl group, and R ₃ is hydrogen, a methyl group, or an ethyl group. , propyl, butyl or phenyl groups are commonly used. Among them R ₁ and R ₂
is a methyl group, and it is particularly preferred that R ₃ is a methyl group. The method for producing polyglutarimide is not particularly limited, but methacrylic resin and ammonia or primary amine are mixed in an inert solvent under an inert gas atmosphere.
Preference is given to methods in which the reaction is carried out at temperatures 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 represented by the above formula () by imidization reaction. If the content of the cyclic imide structural unit is low, it is difficult to obtain a resin composition with a high heat distortion temperature. Examples of methacrylic resins used to form polyglutarimide include methacrylic ester homopolymers, methacrylic esters and other methacrylic esters, acrylic esters, acrylic acid, methacrylic acid, styrene, α-methylstyrene, etc. Examples include copolymers such as substituted styrene. Examples of methacrylic esters include methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, tert.-butyl methacrylate,
Cyclohexyl methacrylate, norbornyl methacrylate, 2-ethylhexyl methacrylate, benzyl methacrylate, etc. Examples of acrylic esters include methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, isobutyl acrylate, and acrylic acid. tert.-butyl, cyclohexyl acrylate, norbornyl acrylate, 2-ethylhexyl acrylate, benzyl acrylate, and the like can be used. These monomers may be used alone or in combination of two or more. Among these methacrylic resins, in the present invention, methyl methacrylate homopolymers or copolymers of 25% by weight or more of methyl methacrylate and 75% by weight or less of other monomers mentioned above are preferred; however, methyl methacrylate A homopolymer of is particularly preferred from the viewpoint of transparency. The polyphenylene sulfuride used in the present invention has the formula It has a repeating unit of n = 50~
5000 is preferable, and more preferably n is
100 to 3000. The blending amounts of polyglutarimide and polyphenylene sulfide are 1 to 99 parts by weight of polyglutarimide and 1 to 99 parts by weight of polyphenylene sulfide (100 parts by weight in total). Preferably, the amount of polyphenylene sulfide in the resin composition is 10 to 90 parts by weight, more preferably 20 to 80 parts by weight. If the amount of polyphenylene sulfide in the composition is small, the resulting composition will not have sufficient fluidity, and if it is too large, the heat distortion temperature under high load will be insufficient. The resin composition of the present invention can be formed by a method such as dry blending polyglutarimide and polyphenylene sulfide and melt extrusion, or blending using a solvent. The composition of the present invention may contain antioxidants, heat stabilizers, lubricants, reinforcing agents, fillers, colorants, conductive materials, pigments, flame retardants, and the like, if necessary. (Example) Hereinafter, the present invention will be explained in more detail with reference to Examples. Note that the measurement method used in the examples is as follows. (1) Heat distortion temperature: ASTM D-648-56 (2) Fluidity: Melt index ASTM-D 1238 (300℃, number of grams under 5 kg) Production example of polyglutarimide Sufficiently dried methyl methacrylate 100 parts by weight of polymer (weight average molecular weight = 150000), 100 parts by weight of dehydrated and dried toluene, dehydrated and dried methanol
10 parts by weight and the imidizing agent shown in Table 1 were placed in an autoclave under a nitrogen atmosphere, and reacted at 230° C. for 2 hours with stirring. The obtained polyglutarimide was extruded using an extruder at a resin temperature of 300°C while degassing volatile components through a vent hole to produce pellets. Table 1 shows the properties of the pellets obtained.

[Table] Example 1 Polyglutarimide prepared as described above and polyphenylene sulfide (Ryton (registered trademark) R-6, manufactured by Philips Petroleum International Co., Ltd.) were mixed as shown in Table 2. The mixture was then extruded through an extruder at a resin temperature of 300°C to obtain pellets of the resin composition. The pellets were passed through an injection molding machine, and test pieces were prepared at a cylinder temperature of 300°C and a mold temperature of 80°C, and their physical properties were evaluated. The results obtained are shown in Table 2.

[Table] (Effects of the Invention) The resin composition of the present invention having the structure described above has a high heat deformation temperature under high loads and also has good fluidity, so it can be used in various ways as a molding material. It is useful for various purposes.

Claims (1)

[Scope of Claims] 1 1 to 99 parts by weight of polyglutarimide and 1 to 99 parts by weight of polyphenylene sulfide (100 parts by weight in total)
A thermoplastic resin composition consisting of (parts by weight). 2 Polyglutarimide has the formula (In the formula, R ₁ , R ₂ and R ₃ are hydrogen and have 1 to 1 carbon atoms.
20 aliphatic, aromatic or alicyclic hydrocarbon groups) containing at least 5% by weight of a cyclic imide structural unit. Thermoplastic resin composition. 3 Polyphenylene sulfide has the formula 2. The thermoplastic resin composition according to claim 1, having a repeating unit of n=50 to 5,000.