JPH03237154A - Thermoplastic resin composition - Google Patents

Abstract

PURPOSE:To obtain a resin composition having excellent characteristics and dimensional stability of a resin by blending a resin component containing an aromatic polycarbonate resin with an inorganic filler such as alumina, iron slag, metal powder or metal fiber and an organic acid. CONSTITUTION:A composition obtained by blending (A) 100 pts. wt. resin component containing an aromatic polycarbonate resin having 5000-50000, preferably 18000-30000 viscosity-average molecular weight or further <=70wt.% other thermoplastic resins added thereto with (D) >=1 pt.wt., preferably >=5 pts.wt. one or more inorganic fillers, selected from the group of alumina, iron slag, metal powder and metal fiber and having the surface optionally treated with a silane coupling agent, etc., and (C) an organic acid, preferably a <=15C aromatic carboxylic acid or <=20C aliphatic carboxylic acid (e.g. phthalic anhydride) in an amount of 0.1-10wt.%, preferably 1-10wt.% based on the component (B).

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 incorporating an inorganic filler into a thermoplastic resin.

However, when an inorganic filler such as alumina is added to an aromatic polycarbonate resin, carbonate bonds in the molecular chain are broken, resulting in a significant decrease in molecular weight, which is a serious drawback. 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 this method has not been able to fully satisfy the problem.

<Object of the invention> The object of the invention is that even if alumina, steel slag, metal powder, metal fiber, etc. are blended with aromatic polycarbonate resin,
An aromatic polycarbonate resin composition or a thermoplastic resin other than aromatic polycarbonate resin that has only a slight decrease in molecular weight, retains the original excellent properties of aromatic polycarbonate resin, and has excellent dimensional stability. The present invention aims to provide a resin composition.

The inventors of the present invention have conducted extensive research to achieve the above object, and have found that if a specific amount of maleic acid is used in combination with the inorganic filler in aromatic polycarbonate resin,
We found that molecular weight reduction can be significantly suppressed. The present invention was completed as a result of further studies based on this knowledge.

<Structure of the Invention> The present invention provides an aromatic polycarbonate resin or an A4 fat component in which 70% by weight or less of another thermoplastic resin is added to the aromatic polycarbonate resin. At least 1 part by weight of at least one inorganic filler selected from the group consisting of alumina, steel slag, metal powder, and metal 11AM per 1 part by weight of OO, and an amount of 0.1 to 10% by weight based on the inorganic filler. The present invention relates to a thermoplastic resin composition containing am'M.

The aromatic polycarbonate resin used in the present invention has a viscosity average molecular weight of 15.0 when induced by dihydric phenol.
00-so, ooo, preferably 18,000-30,
000 aromatic polycarbonate resin, and is usually produced from dihydric phenol and a carbonate precursor by a solution method or a melt method. 2.2 as a representative example of dihydric phenol
-bis(4-hydroxyphenyl)propane (commonly known as bisphenol A), bis(4-hydroxyphenylmethane, 1.1-bis(4-hydroxyphenyl)ethane,
2.2-bis(4-hydroxy-3-methylphenyl)
Examples include propane. Preferred dihydric phenols are bis(4-hydroxyphenyl)alkane compounds, particularly bisphenol A. Dihydric phenols can be used alone or in combination of two or more. Examples of carbonate precursors include carbonyl halides, carbonates, heroformates, and typical examples include phosgene, diphenyl carbonate, dihaloformates of dihydric phenols, and mixtures thereof. In addition, when manufacturing aromatic polycarbonate resin, we use molecular! I moderators, branching agents, catalysts, etc. can be used.

The thermoplastic resin to be mixed with the aromatic polycarbonate 4M resin may be any resin that can be mixed with the aromatic polycarbonate resin, such as thermoplastic polyester resin, polyarylene ester S resin, polystyrene resin, polyethylene resin. , polypropylene resin, diene resin, polyamide resin, polyether resin, polysulfone resin, polyphenylene sulfide resin, etc., or a mixture of two or more thereof.

The thermoplastic polyester resin is a polymer or copolymer obtained by condensation reaction using an aromatic dicarboxylic acid or an ester-forming derivative thereof and a diol or an ester-forming derivative thereof as main raw materials. As the aromatic dicarboxylic acid used here, terephthalic acid, isophthalic acid, naphthalene dicarboxylic acid, etc. are preferable. Diols include fullylene glycol having 2 to 10 carbon atoms, and 6 to 1 carbon atoms.
Five alicyclic diols are preferred, specifically ethylene glycol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol, neopentyl glycol, 3-methylbentanediol (2,4)
, 2-methylbentanediol (1,4), 2-ethylhexanediol (1,3), diethylene glycol, cyclohexane dimetatool, and the like. Preferred thermoplastic polyester resins are polyethylene terephthalate, polybutylene terephthalate, and copolymerized polyesters in which 30 mol% or less of their acid components and/or diol components are replaced with other components.

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-mentioned aromatic polycarbonate resin are preferably used, and the derivatives of dihydric phenol are the dihydric phenols described above.
It is a diester of a hydric 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.

Polystyrene resin for general use is polystyrene, which has a resistance of 1
1i11 polystyrene, As resin, ABS resin, AE
Examples include S resin, MBS resin, MASAs resin, ASAs resin, tyrene-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-propylene copolymer, ethylene-acrylic ester copolymer,
■ Examples include tyrene-glycidyl (meth)acrylate copolymer.

Examples of the polypropylene resin include polypropylene resin, propylene-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-14-polybutadiene resin, or a copolymer thereof 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-caprolactam.

Polyphenylene ether (
Copolymers are preferred.

Inorganic fillers used in the present invention include alumina, steel slag,
Fibers or powders of metals such as stainless steel and brass, among which alumina and steel slag, in which the molecular weight of aromatic polycarbonate resin is greatly reduced, are particularly preferred because they are particularly effective in the present invention. These inorganic fillers may be used alone or in combination of two or more, and the surface of these inorganic fillers may be treated with a treatment agent such as a silane coupling agent before use.

The amount of the inorganic filler used does not need to be specified, but the present invention applies when it is used in an amount that affects the reduction of the molecular weight of the aromatic polycarbonate resin, that is, 1 part by weight or more per 100 parts by weight of the aromatic polycarbonate resin. is effective, particularly when the amount is 5 parts by weight or more, remarkable effects can be obtained.

The organic acids used in the present invention are 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, propionic 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 a decrease in the molecular weight of the aromatic polycarbonate resin caused by the inorganic filler.

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

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 Banbury mixer 1 mixed roll, or an extruder.

The composition of the present invention may contain other additives as necessary without departing from its purpose, such as reinforcing fibers such as glass HN, antioxidants, flame retardants, antistatic agents, mold release agents, and ultraviolet absorbers. etc. can be mixed.

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

<Examples> The present invention will be explained in detail below using examples. In the examples, parts mean parts by weight, and the viscosity average molecule IM is the specific viscosity η3. was calculated by inserting into the formula below.

η /C=[η] + 0.45 [η]20p [η co − 1.23X10 → MHowever, C=0
7 In addition, the impact strength is the value measured using a test piece with a thickness of 1/4" and 1/8" with an isotnotch (K!if-
α/α).

Examples 1 to 7 and Comparative Examples 1 to 3 100 parts by weight of polycarbonate powder obtained from bisphenol A having a viscosity average molecular weight of 24,900 (manufactured by Yojin Kasei Corporation: Vanlite L-1250) was added with the inorganic material listed in Table 1. Add the filler and organic acid in the amounts listed in the table (parts by weight), and make 30
jIIIφ vented extruder (manufactured by Nakatani ■: vS-3
0> at a cylinder temperature of 280° C. to obtain a pellet. This pellet is dried using a hot air circulation dryer.
After drying at 20℃ for 5 hours, the injection molding machine (Japan Steel Works ■
Manufactured by: J-120S^) Cylinder temperature 290℃
A physical property test piece was prepared at a mold temperature of 80°C. Table 1 shows the viscosity average molecular weight M of the pellet and molded article (physical property test piece), and the physical properties of the test piece.

The inorganic fillers listed in Table 1 are as follows.

Steel slag is manufactured by Steel Pipe Mining ■: NKK Finest stainless fiber is manufactured by Nippon Seisen ■: Naslon alumina is manufactured by Sumitomo Chemical tII/J: At-43 Examples 8 to 9 and Comparative Examples 4 and 5 Used in Example 1 To 100 parts by weight of polycarbonate powder with a viscosity average molecular weight of 24.900, steel slag (manufactured by Steel Pipe Mining ■: Finest), chopped glass fiber H (
Nittobo Co., Ltd.: 3PE-4511, a silane coupling agent (Shin-Etsu Silicon Co., Ltd.: 88573) and maleic acid were added in m (parts by weight) as indicated in the table, and a pellet was obtained in the same manner as in Example 1. A test piece was prepared.

Viscosity average molecular j of each pellet and molded product (physical property test piece)
1M and the physical properties of the test pieces are shown in Table 2.

(Margin below)

Claims (1)

[Claims] At least one kind of inorganic filler selected from the group consisting of alumina, steel slag, metal powder, and metal fiber is added to 100 parts by weight of the resin component, which is an aromatic polycarbonate resin or an aromatic polycarbonate resin with 70% by weight or less of other thermoplastic resin added. 0.1 to 1 part by weight or more of the agent and the inorganic filler
A thermoplastic resin composition containing an organic acid in an amount of ~10% by weight.