JPS6242942B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to a polycarbonate resin composition that has excellent fluidity during molding without impairing the inherent mechanical properties of the polycarbonate resin. [Technical background of the invention and its problems] Polycarbonate resin is used in a wide range of fields as a so-called engineering plastic because its molded products have excellent mechanical properties and heat resistance. However, this resin has a high melt viscosity, so it has the disadvantage of poor moldability during molding. Various methods have been proposed to improve this point, but none of these methods improves moldability without sacrificing the excellent mechanical properties and heat resistance that polycarbonate resin inherently has. In terms of improvement, it was not satisfactory. [Object of the Invention] The object of the present invention is to provide a polycarbonate resin composition that has high fluidity, that is, excellent moldability, without reducing the excellent properties of polycarbonate resin. [Summary of the Invention] As a result of intensive research aimed at achieving the above object, the present inventor found that it is possible to achieve this by simply adding a very small amount of a specific aluminum chelate compound to polycarbonate resin, and has developed the present invention. We have developed a resin composition for this purpose. That is, the polycarbonate resin composition of the present invention contains 100 parts by weight of polycarbonate resin and the following formula: (In the formula, R ¹ and R ² represent an alkyl group having 1 to 22 carbon atoms; R ³ represents an alkyl group having 1 to 22 carbon atoms;
Represents an alkoxy group having 1 to 22 carbon atoms or an alkenyloxy group having 3 to 22 carbon atoms; m is 0 or 1, n
is 1 or 3, provided that when m is 0, n is 3, and when m is 1, n is 1).
It is characterized by containing 0.1 part by weight. The polycarbonate resin, which is the base of the composition of the present invention, is produced by a solvent method, that is, in a solvent such as methylene chloride, in the presence of a known acid acceptor and a molecular weight regulator, with a dihydric phenol and a carbonate precursor such as phosgene. or a resin produced by the transesterification reaction of dihydric phenol and diphenyl carbonate with a carbonate precursor. Here, as the dihydric phenol that can be used, bisphenols are preferable, and 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) is particularly preferable. Further, part or all of bisphenol A may be replaced with another dihydric phenol. Examples of divalent phenols other than bisphenol A include hydroquinone, 4,4'-dihydroxydiphenyl, bis(4
-hydroxyphenyl)alkane, bis(4-hydroxyphenyl)cycloalkane, bis(4-
Compounds such as hydroxyphenyl) sulfide, bis(4-hydroxyphenyl) sulfone, bis(4-hydroxyphenyl) sulfoxide, bis(4-hydroxyphenyl) ether or bis(3,5-dibromo-4- hydroxyphenyl)
Examples include halogenated bisphenols such as propane. It may be a homopolymer or a copolymer or a blend of two or more of these dihydric phenols. Furthermore, it may be a thermoplastic randomly branched polycarbonate obtained by reacting a polyfunctional aromatic compound with a dihydric phenol and/or a carbonate precursor. In terms of mechanical strength and moldability, the polycarbonate resin used has a viscosity average molecular weight of
15000~35000 is preferable, especially 20000~
30000 is suitable. The resin composition of the present invention is composed of 0.001 to 0.1 parts by weight of an aluminum chelate compound represented by the above formula to 100 parts by weight of the polycarbonate resin described above. If the blending amount is less than 0.001 part by weight, the fluidity of the resulting resin composition will not improve, so no improvement in moldability will be observed; if the blending amount exceeds 0.1 part by weight, the fluidity will improve, but on the other hand This is disadvantageous because the impact resistance of the resin composition molded article decreases. The preferred range is 0.005 to 0.05 parts by weight. The aluminum chelate compound used is
Diisopropoxyaluminum monooleylacetoacetate, diisopropoxyaluminum monoethylacetoacetate, aluminum tris(acetylacetonate), diisopropoxyaluminum monolauryl acetoacetate, diisopropoxyaluminum monostearylacetoacetate, diisopropoxyaluminum monoiso Examples include stearyl acetoacetate. Among these, diisopropoxyaluminum monooleylacetoacetate, diisopropoxyaluminum monoethylacetoacetate, and aluminum tris(acetylacetonate) are particularly preferred. The resin composition of the present invention is prepared by pre-blending predetermined amounts of each component using a drum tumbler, Henschel mixer, super mixer, etc., and then blending the resulting mixture using a Banbury mixer, single-screw or multi-screw kneader, etc. It can be easily produced by melt-kneading at a temperature of 250 to 300°C. At this time, inorganic fillers, colorants, various other additives, and other synthetic resins can also be blended in the following manner. First, inorganic fillers added for the purpose of increasing the mechanical strength, durability, or weight of polycarbonate resin include glass fiber, glass beads, glass flakes, calcium carbonate, calcium sulfate, talc,
You can give clay, mica, etc. In particular, various glass fillers are useful. These fillers may be blended in an amount of 1 to 40 parts by weight, preferably 5 to 30 parts by weight, per 100 parts by weight of the polycarbonate resin. If the blending amount exceeds 40 parts by weight, the fluidity of the resulting resin composition will be extremely reduced. Colorants are pigments and dyes for imparting color to polycarbonate resin, and pigments include:
Organic pigments such as phthalocyanine, quinacridone, and benzidine; oxides, sulfides, and sulfates of metals such as titanium, lead, zinc, and cadmium, and inorganic pigments such as carbon black and aniline black produced by the Furness method or impact method. I can give you pigment. Examples of dyes include azo, anthraquinone, thioindigo, quinoline, and indanthrene dyes. The blending amount of these colorants is 0.05 to 5.0 parts by weight, preferably 0.5 to 2.0 parts by weight per 100 parts by weight of polycarbonate resin.
Parts by weight. If the blending amount exceeds 5.0 parts by weight, the impact resistance of the resulting resin composition will decrease. Other additives include, for example, phosphite-based and phosphate-based antioxidants; for example, benzotriazole-based and benzophenone-based ultraviolet absorbers; for example, aliphatic carboxylic ester-based antioxidants;
Paraffin-based external lubricants: Commonly used flame retardants, mold release agents, antistatic agents, etc. Examples of other synthetic resins include polyethylene, polypropylene, polystyrene, AS resin, ABS resin, polyester, and polymethyl methacrylate. [Examples of the Invention] Examples 1 to 18 As polycarbonate resins, A: bisphenol A type polycarbonate resin having a viscosity average molecular weight of 25,000, and B: bisphenol A type polycarbonate resin having a viscosity average molecular weight of 28,000. As aluminum chelate compounds, A: diisopropoxyaluminum monooleyl acetoacetate, B: ethyl acetoacetate aluminum diisopropylate, and C: aluminum tris (acetylacetonate) were prepared. As an inorganic filler, GF is aluminosilane-treated alkali-free glass in the form of a chopped strand with a length of 3 mm.As a coloring agent,
CB: channel black, TiO ₂ : rutin type titanium dioxide and perinone were prepared. These components were mixed in the proportions shown in the table, kneaded, and subjected to injection molding. The fluidity, that is, moldability, Izot impact strength, and heat distortion temperature of each resin composition were measured according to the following specifications. Fluidity: Determined by the minimum filling pressure gauge pressure (Kg/cm ² ) in injection molding of dumbbells for measuring tensile properties as specified in JIS-K6719. Materials with high values have high fluidity. However, the actual pressure was 12 times the gauge pressure. Izotsu impact strength: Measured according to the method specified in JIS-K6719. Heat distortion temperature: Measured according to the method specified in JIS-K6719. The above results are summarized in the table.

【table】

〔Effect of the invention〕

As is clear from the above results, the polycarbonate resin composition of the present invention has excellent fluidity during molding, and the molded products obtained do not deteriorate the mechanical properties and heat resistance inherent to the polycarbonate resin. It is useful as a material for injection molding and injection compression molding to produce home appliances, optical equipment, and automobile parts, and its industrial value is great.

Claims (1)

[Claims] 1. To 100 parts by weight of polycarbonate resin, the following formula: (In the formula, R ¹ and R ² represent an alkyl group having 1 to 22 carbon atoms; R ³ represents an alkyl group having 1 to 22 carbon atoms;
Represents an alkoxy group having 1 to 22 carbon atoms or an alkenyloxy group having 3 to 22 carbon atoms; m is 0 or 1, n
is 1 or 3, provided that when m is 0, n is 3, and when m is 1, n is 1).
A polycarbonate resin composition characterized in that it contains 0.1 part by weight.