JPH0321664A - Thermoplastic resin composition - Google Patents

Abstract

PURPOSE:To obtain a composition suitable for large-sized precision machine parts, etc., suppressing reduction in molecular weight, maintaining excellent characteristic properties of resin, having excellent dimensional stability by blending an aromatic polycarbonate resin with a specific amount of talc and organic acid. CONSTITUTION:(A) 100 pts.wt. aromatic polycarbonate resin having 16,000-50,000 viscosity-average molecular weight is blended with (B) >=1 pt.wt., preferably >=5 pts.wt. talc and (C) 0.1-10wt.%, preferably 1-10wt.% based on the component B of an organic acid (e.g. acetic acid or propionic acid).

Description

Detailed Description of the Invention Fields of Application The present invention provides an aromatic polycarbonate resin composition that retains the excellent properties of aromatic polycarbonate resin and has excellent dimensional stability, or an aromatic polycarbonate resin composition that retains the excellent properties of aromatic polycarbonate resin and has excellent dimensional stability. The present invention relates to a thermoplastic resin composition containing a plastic resin as a main component.

Prior Art> It has been known to improve dimensional stability by adding an inorganic filler to a thermoplastic resin.

However, when inorganic fillers are added to aromatic polycarbonate resins, carbonate bonds in the molecular chains are broken, resulting in a significant decrease in molecular weight, which is a serious drawback.

In particular, talc is often used as an additive for thermoplastic resins, but it greatly reduces the molecular weight of aromatic polycarbonate resins, for example, talc has a viscosity average molecular weight of 25.0
When about 10% by weight of talc was blended into aromatic polycarbonate resin No. 00, the viscosity average molecular weight decreased to 15,000 or less, making it completely unusable.

As a method for solving this drawback, a method is known in which the inorganic filler is treated with a silane coupling agent in advance, but even if this method is applied to talc, it is difficult to obtain a product that can be used in practical use.

OBJECT OF THE INVENTION The object of the present invention is to create an aromatic polycarbonate resin in which even when talc is added to the aromatic polycarbonate resin, the molecular weight decreases only slightly, the original excellent properties of the aromatic polycarbonate resin are maintained, and the dimensional stability is excellent. It is an object of the present invention to provide an aromatic polycarbonate resin composition or a resin composition containing an aromatic polycarbonate resin and another thermoplastic resin as main components.

As a result of extensive studies aimed at achieving the above object, the present inventors have found that molecular weight reduction can be significantly suppressed by using a specific amount of maleic acid when blending talc into aromatic polycarbonate resin. The present invention was completed as a result of further studies based on this knowledge. <Structure of the Invention> The present invention is characterized in that 100 parts by weight of an aromatic polycarbonate resin or a resin component in which 10% by weight or less of another thermoplastic resin is added to an aromatic polycarbonate resin, 1 part by weight or more of talc, and 1 part by weight or more of talc. This invention relates to a thermoplastic resin composition containing an organic acid in an amount of 0.1 to 10% by weight.

The aromatic polycarbonate resin used in the present invention has a viscosity average molecular weight derived from dihydric phenol of 16.0
00~so,ooo, preferably 18,000~30,
000 aromatic polycarbonate resin, and is usually produced by a solution method or a melt method using dihydric phenol and a carbonate precursor. Typical examples of dihydric phenols include:
2.2-bis(4-hydroxyphenyl)broban [bisphenol A], bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl>ethane, 2,2-bis(4- Examples include hydroxy-3-methylphenyl)propane. Preferred dihydric phenols are bis(4-hydroxyphenyl)alkane compounds, particularly bisphenol A. Dihydric phenols may be used alone or in combination of two or more types. In addition, examples of the carbonate precursor include canolebonyl halide, carbonate, haloformate, etc., and typical examples include phosgene, diphenyl carbonate, dihaloformate of dihydric phenol, and mixtures thereof. When producing an aromatic polycarbonate resin, a molecular weight regulator, a branching agent, a catalyst, etc. can be used as necessary.

The thermoplastic resin to be mixed with the aromatic polycarbonate resin may be any resin that can be mixed with the aromatic polycarbonate resin, such as thermoplastic polyester resin, polyarylene ester resin, polystyrene resin, polyethylene resin, polypropylene resin, etc. Examples include one type or a mixture of two or more types selected from type resins, diene type resins, polyamide type resins, polyether type resins, polysulfone type resins, polyphenylene sulfide type resins, and the like.

Thermoplastic polyester resins are polymers or copolymers obtained by condensation reaction of aromatic dicarboxylic acids or their ester-forming derivatives and diols or their ester-forming derivatives as main raw materials. Preferred aromatic dicarboxylic acids used here are terephthalic acid, isophthalic acid, naphthalene dicanolebonic acid, etc., and preferred diions are linear methylene chain type aliphatic diols having 2 to 10 carbon atoms, and 6 to 15 alicyclic diols, specifically ethylene glycol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol, neobentyl glycol, 3-methylbentanediol (2.4), 2-methyl Bentanediol (
1.4), 2-ethylhexanediol (1.3),
Examples include diethylene glycol and cyclohexanedimethanol. Preferred thermoplastic polyester resins include polyethylene terephthalate and polybutylene terephthalate, in which 30 mol% or less of these acid components and/or diol components are other components! This is a copolymerized polyester.

Polyarylene ester resin is a polymer or copolymer obtained by condensation reaction of dihydric phenol or its derivative and aromatic dicarboxylic acid or its derivative as main raw materials. As the dihydric phenol used here, those explained in the above aromatic polycarbonate resin are preferably used, and the derivative of the dihydric phenol is a diester of the dihydric phenol and an aliphatic or aromatic carboxylic acid. As the aromatic dicarboxylic acid, those explained in connection with the thermoplastic polyester resin are preferably used.

Any method such as an interfacial polycondensation method, a solution polycondensation method, or a melt polycondensation method can be used to produce a polyarylene ester resin from a dihydric phenol or its derivative and an aromatic dicarboxylic acid or its derivative.

As a polystyrene resin, general-purpose polystyrene, m-resistant
Examples include permeable polystyrene, As resin, ABS resin, AES resin, MBS resin, MAS resin, AAS resin, styrene-butadiene block copolymer, styrene-maleic anhydride copolymer, and the like.

As polyethylene resin, high density polyethylene resin,
Low density polyethylene resin, linear low density polyethylene resin, ethylene-vinyl acetate copolymer, ethylene-brobylene copolymer, ethylene-acrylic ester copolymer,
Examples include ethylene-glycidyl (meth)acrylate copolymer.

Examples of polypropylene resin include polypropylene resin, bropylene-vinyl acetate copolymer, propylene-vinyl chloride copolymer, and the like.

The diene resin is a monomer having a diene structure such as 1,2-polybutadiene resin or trans-1,4-polybutadiene resin, or a copolymer with a monomer copolymerizable with these monomers, or a mixture thereof.

The polyamide resin is a polymer consisting of an aminocarboxylic acid compound alone or a dicarboxylic acid compound and a diamine compound, or a polymer obtained by ring-opening polymerization of α,ω-cabrolactam.

As a polyether resin, polyphenylene resin (
Co)polymers are preferred.

The amount of talc used in the present invention does not need to be specified, but the amount of talc that affects the reduction of the molecular weight of the aromatic polycarbonate resin is 1 part by weight or more based on 100 parts by weight of the aromatic polycarbonate resin. is effective, and particularly when there are five or more sides, a remarkable effect can be obtained. Furthermore, before using talc, the surface may be treated with a treatment agent such as a silane coupling agent.

The organic acids used in the present invention include carboxylic acids, sulfonic acids, etc., and aromatic carboxylic acids having 15 or less carbon atoms and aliphatic carboxylic acids having 20 or less carbon atoms are particularly preferred. Specifically, aliphatic carboxylic acids such as acetic acid, brobionic acid, butyric acid, malonic acid, succinic acid, glutaric acid, stearic acid, maleic acid, maleic anhydride, fumaric acid, citraconic acid, citraconic anhydride, itaconic acid, and benzoic acid. Examples include aromatic carboxylic acids such as acids, phthalic acid, phthalic anhydride, isophthalic acid, and terephthalic acid.

By using such an organic acid, it is possible to significantly suppress the deterioration of the molecular weight of the aromatic polycarbonate resin due to talc.

If the amount of acid used is too small, a sufficient effect of suppressing molecular weight reduction cannot be obtained, and if it is used too much, the effect becomes saturated. The usage amount is normally selected from the range of 0.1 to 10% by weight based on the amount of talc used, and the optimum usage amount is selected from the range of 1 to 10% by weight based on the amount of talc used.

The composition of the present invention can be produced by mixing the above-mentioned components using any method such as a tumbler blender, a Nauta mixer, a pumperly mixer, a kneading roll, an extruder, etc. Other additives, such as antioxidants, flame retardants, antistatic agents, mold release agents, ultraviolet absorbers, etc., may be mixed into the composition as necessary within a range that does not deviate from the purpose of the composition.

Effects of the Invention> Even when a sufficient amount of talc is blended into the aromatic polycarbonate resin, the composition of the present invention significantly suppresses the decrease in molecular weight, maintains the resin's original excellent properties, and exhibits dimensional stability. Due to its excellent properties, it can be applied to any melt molding method such as injection molding, extrusion molding, compression molding, rotational molding, etc., and is particularly suitable for applications that could not be used conventionally, such as large precision machine parts and large automobile parts. It has industrial effects such as making it possible to use it.

<Examples> The present invention will be explained in detail below using examples. In addition, parts in the examples mean parts by weight, and the viscosity average molecular weight is calculated by inserting the specific viscosity η8, which was determined from a solution dissolved in methylene chloride at a concentration of 0.7 g/dl at 20°C, into the formula below. I asked for it.

η3,/C=[η] + 0.45 [η]2GE
77] = L23 x 10-M”J
However, C=O. γ In addition, the impact strength is the value measured using a test piece with a thickness of 1/4"1/8" with an Izod notch (kgLc
m/cm).

Examples 1 to 8 and Comparative Example 1.2 Polycarbonate powder obtained from bisphenol A with a viscosity average molecular ffi of 24,900 (manufactured by Teijin Kasei ■: Panlite L-1250), 100 parts of talc, 10 parts of talc
Add the 11N acid listed in Table 1 in the amount (parts by weight) listed in the table, and use a 30e+aΦ vented extruder (Nakatani vI).
I$7: Cylinder temperature 2 using VSK-30)
A pellet was obtained by extrusion at 80°C. After drying this pellet at 120℃ for 5 hours using a hot air circulation dryer,
A physical property test piece was prepared using an injection molding machine (manufactured by Japan Steel Works, Ltd.: J-120SA) at a cylinder temperature of 290°C and a mold temperature of 80°C.

Viscosity average molecule f of each pellet and molded product (physical property test piece)
The fiM and physical properties of the test pieces are shown in Table 1.

The talc in Table 1 is P-3 manufactured by Nippon Talc (■).

(Margin below)

Claims (1)

[Claims] Add 1 part by weight or more of talc to 100 parts by weight of an aromatic polycarbonate resin or a resin component in which 70% by weight or less of another thermoplastic resin is added to the aromatic polycarbonate resin, and an amount of 0.1 to 10% by weight based on the talc. A thermoplastic resin composition containing an organic acid.