JPH093211A - Resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a resin composition excellent in resistance to heat discoloration and mechanical strength, and suitable for liquid crystal display reflective plates, telephone cards, coating material ingredients, by incorporating a resin with inorganic filler(s) with its base quantity at or lower than a specified level. SOLUTION: This resin composition is obtained by incorporating a resin pref. a polycarbonate resin or polyethylene terephthalate resin with at least one kind of filler <=20μmol/g in base quantity selected from the group consisting of titanium dioxide, zinc oxide, zinc sulfide, barium sulfate, α-ferric oxide, triiron tetroxide and γ-ferric oxide.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a resin composition containing a filler.

[0002]

Resins made of various polymers or copolymers, which are generally called synthetic resins, have various excellent properties.
Widely used in daily life as automobile parts, office automation equipment parts, building materials, etc. For example, polycarbonate resin is
Polyester resin has been used as various magnetic cards such as telephone cards as a liquid crystal display reflection plate and the like, and it is expected that its application range will be further widened in the future.

These resins have been considered to be used by making use of their respective characteristics such as mechanical strength, electrical characteristics, chemical resistance, and dimensional stability, and various additives according to their purposes have been considered. By blending, the device has been devised to improve each function. Among these additives, so-called fillers are mixed for the purpose of enhancing the usability by coloring the resin as a pigment or increasing the amount of the resin as an extender pigment.

When a resin containing a filler is used for applications such as a magnetic card, the molecular weight of the resin decreases during kneading and molding of the filler, causing thermal discoloration and mechanical strength reduction. There is a problem. Furthermore, the molded product is
Since it is affected by outdoor sunlight, ultraviolet rays contained in indoor lighting, etc., it has a problem of discoloration to yellow after long-term use.

Japanese Patent Publication No. 60-3430 discloses a technique for preventing the yellowing of a resin composition by light by coating the surface of titanium dioxide particles with a hydrated aluminum oxide and organosilicon or alkanolamine. Has been done.

However, with such a coating alone,
Although it is possible to obtain a certain effect against yellowing due to light, it is possible to obtain the expected effect in terms of mechanical strength in things such as magnetic cards that are heavily and heavily abused. There wasn't.

Japanese Patent Publication No. 7-5763 discloses a technique for obtaining a polyester film which prevents yellowing due to light by containing a certain amount of anatase type titanium dioxide containing a certain amount of a zinc compound in polyester. ing. Further, Japanese Patent Publication No. 7-5764 discloses a technique for obtaining a polyester film which prevents yellowing due to light by containing a certain amount of anatase type titanium dioxide containing a certain amount of an aluminum compound and silicon dioxide in polyester. It is disclosed.

These are techniques for improving the light resistance of a white biaxially stretched polyester film applied to a magnetic card or the like, but the expected effect could not be obtained in terms of mechanical strength.

[0009]

In general, resins such as polycarbonate and polyester have a problem that their molecular weight is lowered during kneading and molding of a filler to deteriorate mechanical strength and discolor. Therefore, it has been desired to develop a technique for obtaining a filler capable of suppressing the deterioration of the resin.

In view of the above situation, an object of the present invention is to provide a resin composition containing a filler capable of imparting sufficient heat discoloration resistance and mechanical strength.

[0011]

As a result of various studies, the inventors of the present invention have found that conventional fillers have a solid acid-basic property, and in particular, the basicity of the filler is determined by the thermal decomposition of resins such as polycarbonate and polyester. It has been found that the reduction is promoted, and that the thermal decomposition of the resin can be prevented and the heat discoloration resistance can be improved by treating the surface of the filler to reduce the amount of its base. Furthermore, in addition to reducing the amount of base, by coating with an organometallic compound, the wettability between the filler and the resin is improved, and it was found that sufficient mechanical strength can be obtained. Based on this, the present invention has been completed.

The gist of the present invention is that the amount of base is 20 μmol / g.
There is a resin composition containing the following inorganic filler, and in such a resin composition, titanium dioxide, zinc oxide, zinc sulfide, barium sulfate, α-ferric oxide, ferric oxide and γ. -A filler containing at least one selected from the group consisting of ferric oxide and having a base amount of 20 µmol / g or less is contained. The gist of the invention is also that in such a resin composition, from the group consisting of titanium dioxide, zinc oxide, zinc sulfide, barium sulfate, α-ferric oxide, ferric tetroxide and γ-ferric oxide. After coating the selected at least one fine powder with a hydrated oxide consisting of 0.2 to 5.0% by weight based on the fine powder of at least one of hydrous silica and hydrous alumina, Coated with 0.1 to 5.0% by weight of reactive polysiloxane based on the powder to give a base amount of 20 μmol /
The content is controlled to g or less, and the surface thereof is made of at least one kind selected from the group consisting of an organic silicon compound, an organic aluminum compound, an organic titanium compound and an organic zirconium compound in an amount of 0.1 to 2.0% by weight based on the fine powder. It also exists to contain a filler which is coated with an organometallic compound and has improved wettability with a resin. Hereinafter, the present invention will be described in detail.

The resin which is the subject of the resin composition of the present invention is not particularly limited, and examples thereof include automobile parts, electric / electronic parts, OA equipment parts, building materials, home electric appliance parts, sports equipment and parts thereof, and films. Examples thereof include those widely used in the shape of a sheet, a sheet, a card, and the like. Examples of such materials include polycarbonate resins used in liquid crystal display reflectors, highway sound insulation plates, automobile front grills, lighter fuel tanks, etc .; telephone cards, credit cards,
Polyethylene terephthalate resin used for magnetic cards such as railway cards; polyethylene terephthalate resin used for food containers, microwave oven grills, etc .; poly used for hair dryer nozzles, coil bobbins, cooling fans for office automation equipment, etc. Butylene terephthalate resin; Polyimide resin used for automobile carburetors, engine head covers, etc .; Polyphenylene sulfide resin used for IC cases, transistor cases, small motor housings, etc .; Used for automobile door knobs, fasteners, automobile seat belt parts, etc. Examples of the polyacetal resin include liquid crystal polyester resins used in electric connectors, IC sockets, optical fiber connectors, and the like.

Among them, polycarbonate resin used for liquid crystal display reflection plates, highway sound insulation plates, etc.,
The polyethylene terephthalate resin used for magnetic cards such as telephone cards, credit cards, railway cards, etc. is important as the present invention can be extremely usefully applied as its usage is expanded.

Examples of the above-mentioned resins include the above-mentioned resins and general thermoplastic resins. Examples thereof include polyethylene, polypropylene, poly-4-methylpentene-1, ionomer, polyvinyl chloride, and poly (vinyl chloride). Vinylidene chloride, ABS resin, polystyrene, AS resin,
Methacrylic resin, polyvinyl alcohol, cellulosic resin, thermoplastic elastomer and the like can be mentioned.
Further, thermosetting resins such as epoxy resin, unsaturated polyester resin, phenol resin, urea resin, melamine resin, polyurethane resin, and silicone resin; polyamide resin, modified polyphenylene ether resin, thermoplastic polyester resin, polytetrafluoroethylene resin, Fluorine resin, polysulfone, amorphous polyarylate, polyetherimide, polyethersulfone, polyetherketone, polyamideimide, polyallylethernitrile,
Engineering plastics such as polybenzimidazole and polymer alloys can also be mentioned as the resin according to the present invention.

The filler of the present invention can be used not only in the above resins but also in the fields of paints, inks, etc., for example, powder paints such as polyester isocyanate and polyester epoxy; heat resistant paints such as silicone modified polyester. It can also be suitably used for applications such as.

The filler according to the present invention is an inorganic filler having a base amount of 20 μmol / g or less. The inorganic filler is not particularly limited, but among them, titanium dioxide,
Zinc oxide, zinc sulfide, barium sulfate, α-ferric oxide,
Ferric tetroxide, γ-ferric oxide and the like are preferable, and in the present invention, one of these may be used, and
Two or more can be used in combination. The titanium dioxide is not particularly limited, and its crystal form may be rutile type or anatase type. Further, it may be one produced by the sulfuric acid method or one produced by the chlorine method or another method.

The zinc oxide is not particularly limited, and for example, zinc oxide produced by the French method,
It may be manufactured by the American method or may be manufactured by the wet method.

The zinc sulfide is not particularly limited, and examples thereof include those produced by the reaction of an aqueous zinc sulfate solution and an aqueous sodium sulfide solution.

The barium sulfate is not particularly limited, and may be, for example, one produced by the sodium sulfate method or one produced by the sulfuric acid method.

The α-ferric oxide is not particularly limited, and may be, for example, one synthesized by hydrothermally treating ferric hydroxide in an autoclave, or one obtained by firing acicular goethite. Or a red iron oxide made by firing iron sulfate.

The above-mentioned iron oxide black is not particularly limited,
For example, it may be obtained by reducing α-ferric oxide described above, or may be one synthesized by wet-oxidizing ferrous hydroxide.

The above-mentioned γ-ferric oxide is not particularly limited, and examples thereof include those produced by gradually oxidizing the above-mentioned ferrosoferric oxide. As the filler of the present invention, one of the above-mentioned titanium dioxide, zinc oxide, zinc sulfide, barium sulfate, α-ferric oxide, ferric tetroxide and γ-ferric oxide is used, or Two or more types are used together.

In the present invention, the amount of base in the filler is 20 μmol / g or less. 20 bases
If it exceeds μmol / g, the heat discoloration resistance and mechanical strength which are the specific effects of the present invention cannot be obtained. The above base amount according to the present invention can be measured as follows.

Add an excess amount of dilute nitric acid to the target filler,
By the back titration method by quantifying the remaining amount of consumption. For example, first, 1.0 g of the target filler is precisely weighed and placed in a 50 ml Erlenmeyer flask with a ground stopper, and then dried at 110 ° C. for 2 hours. After adding 30 ml of a methanol solution of 0.003 N adsorption reagent (nitric acid), ultrasonic dispersion was performed for 1 hour,
Let stand overnight in the refrigerator. Then, at 0 to -10 ° C,
After centrifugation by centrifugation at 5000 rpm for 30 minutes and sampling the supernatant, it is left to stand until it reaches room temperature. Dilute 10 ml of this sample with 50 ml of methanol,
The amount of base is measured with a potentiometric titrator. The amount of base is calculated by using potassium methoxide (0.003N methanol solution) as a titration reagent and measuring the amount of diluted nitric acid consumed.

The above-mentioned filler of the present invention can be prepared by coating with a hydrated oxide, a reactive polysiloxane and an organometallic compound, and the amount of base is 20 μmol by the following treatment. / G or less. That is, titanium dioxide, zinc oxide, zinc sulfide,
0.2 to 5.0 weight% of at least one fine powder selected from the group consisting of barium sulfate, α-ferric oxide, ferrosoferric oxide and γ-ferric oxide with respect to the fine powder. % Hydrous silica and hydrous alumina, at least one of which is coated with a hydrated oxide, and then coated with 0.1 to 5.0% by weight of the above fine powder of reactive polysiloxane. The surface is 0.1 to the above fine powder.
It is achieved by coating with an organometallic compound of 2.0% by weight of at least one of an organosilicon compound, an organoaluminum compound, an organotitanium compound and an organozirconium compound.

The present invention was the first to find the relationship between the base amount of the filler and the heat discoloration resistance and mechanical strength, and in particular, the base amount can be remarkably reduced by coating with the reactive polysiloxane. Is something that could not be obtained from conventional knowledge. In the resin composition of the present invention, the amount of base on the surface of the filler is suppressed to 20 μmol / g or less, and by coating with the above-mentioned organometallic compound,
Since the wettability between the filler and the resin is improved, the deterioration of the mechanical strength of the resin and the thermal discoloration phenomenon can be suppressed extremely effectively.

The details of the above treatment for obtaining the filler of the present invention will be described below. The above-mentioned hydrous silica and hydrous alumina are not particularly limited, and examples thereof include hydrated oxides of normal silicon and hydrated oxides of normal aluminum. By these, the surface of the fine powder of the filler can be coated. The coating can be carried out by a usual method, for example, after adding a water-soluble compound of aluminum to an aqueous slurry of the fine powder of the filler, it is neutralized to give a hydrated oxide of aluminum on the fine powder surface. It can be easily carried out by precipitating it in the following manner, and then filtering and drying.

The amount of hydrated oxide consisting of at least one of the above-mentioned hydrous silica and hydrous alumina is 0.2 to 5.0% by weight based on the amount of the above fine powder. 0.2% by weight
If it is less than 5.0%, sufficient light resistance and mechanical strength cannot be obtained, and if it exceeds 5.0% by weight, not only is it economically disadvantageous, but the dispersibility decreases. Preferably 0.5-2.
0% by weight.

In the present invention, on the surface of the filler,
After forming the hydrated oxide coating, 0.1 to 5.0 wt% of reactive polysiloxane is coated on the fine powder. If it is less than 0.1% by weight, sufficient heat discoloration resistance and mechanical strength cannot be obtained, and if it exceeds 5.0% by weight, it is not only economically disadvantageous but also adversely affects the dispersibility. Will be affected. Preferably 0.1 to
2.0% by weight. The coating can be carried out by an ordinary method, for example, after forming the coating with the hydrated oxide, it can be treated by adding reactive polysiloxane and pulverizing with a jet mill or the like.

In the present invention, the above-mentioned reactive polysiloxane is a siloxane polymer composed of constitutional units represented by the following formula (I) or (II).

[0032]

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In the formula, R ¹ represents an alkyl group having 1 to 5 carbon atoms. X ¹ is a reactive functional group and represents hydrogen, a hydroxyl group or an alkoxyl group having 1 to 5 carbon atoms.

[0034]

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In the formula, R ² , R ³ and R ⁴ are the same or different and each represents an alkyl group having 1 to 5 carbon atoms. X ² is a reactive functional group, which is hydrogen, a hydroxyl group or a carbon number of 1
Represents an alkoxyl group of ~ 5. Examples of such reactive polysiloxanes include hydrogen methyl polysiloxane and methyl methoxy polysiloxane. Specifically, examples of the hydrogen methyl polysiloxane include KF- manufactured by Shin-Etsu Silicone Co., Ltd.
99, TSF-483 manufactured by Toshiba Silicone Co., TSF-484 manufactured by Toshiba Silicone Co., Ltd., and the like, and methyl methoxypolysiloxane includes AFP-1 manufactured by Shin-Etsu Silicone Co., Ltd.

In the present invention, the surface of the filler thus coated is further coated with the fine powder of 0.
A coating with an organometallic compound of 1 to 2.0% by weight of at least one of an organosilicon compound, an organoaluminum compound, an organotitanium compound and an organozirconium compound is formed. If it is less than 0.1% by weight, mechanical strength cannot be obtained, and if it exceeds 2.0% by weight, not only is it economically disadvantageous, but also the dispersibility is lowered and the heat discoloration resistance is lowered. Will be affected. It is preferably 0.1 to 1.0% by weight. The above-mentioned coating can be carried out by a usual method, and for example, it can be treated by adding an organometallic compound to the filler powder thus coated and stirring and mixing at a high speed.

Examples of the above organic silicon compounds include the following five kinds (1) to (5). (1) and a functional group X ³ and a hydrolyzable alkoxy group, the general formula X ³ _m -Si- (OR ⁵⁾ alkoxysilane or a silane coupling agent represented by the _4-m. In the formula, R ⁵ represents an alkyl group having 1 to 5 carbon atoms.
X ³ represents at least one selected from the group consisting of hydrogen, an alkyl group having 1 to 30 carbon atoms, a vinyl group, an epoxy group, a methacryloxy group, an amino group, a chloropropyl group and a mercapto group. m represents an integer of 1 to 3. (2) and a functional group X ⁴ and chloro groups, chlorosilane of the general formula _{^{X 4 s -Si-Cl 4-}} s. In the formula, X ⁴ represents at least one selected from the group consisting of hydrogen, an alkyl group having 1 to 30 carbon atoms, a vinyl group, an epoxy group, a methacryloxy group, an amino group, a chloropropyl group and a mercapto group.
s represents an integer of 1 to 3. (3) A silazane compound having a -N-Si- group or a silylating agent. (4) A both-end reactive siloxane polymer represented by the following general formula (III) or a one-end reactive siloxane polymer represented by the following general formula (IV).

[0038]

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In the formula, R ⁸ and R ⁹ are the same or different,
It represents an alkyl group having 1 to 5 carbon atoms. X ⁵ and X ⁶ are the same or different and each represents an amino group, a mercapto group, a methacryloxy group or an epoxy group. t represents an integer of 2 to 1000.

[0040]

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In the formula, R ¹⁰ and R ¹¹ are the same or different,
It represents an alkyl group having 1 to 5 carbon atoms. X ⁷ is an amino group,
It represents a mercapto group, a methacryl group or an epoxy group. Y
Represents an alkyl group having 1 to 5 carbon atoms. q is 2 to 10
Represents an integer of 00. (5) Silicone oil having a polysiloxane bond in the main chain represented by the following general formula (V), or modified silicone oil in which an organic functional group other than an alkyl group and a phenyl group is introduced into the side chain of the silicone oil. .

[0042]

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In the formula, R ¹² and R ¹³ are the same or different,
It represents at least one selected from the group consisting of an alkyl group having 1 to 5 carbon atoms and a phenyl group. k is 2 to 100
Represents an integer of 0.

Specific examples of such an organic silicon compound include, for example, diphenyldimethoxysilane (manufactured by Shin-Etsu Silicone Co., Ltd., KBM202, Toshiba Silicone Co., Ltd., TS).
L8172), γ-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Silicone, KBM403, Toshiba Silicone, TSL8350), γ-methacryloxypropylmethoxysilane (manufactured by Shin-Etsu Silicone, KBM5).
03, Toshiba Silicone, TSL8370), γ-aminopropyltrimethoxysilane (Shin-Etsu Silicone, KBM903, Toshiba Silicone, TSL831)
1), dimethyl polysiloxane (manufactured by Shin-Etsu Silicone Co.,
KF96, Toshiba Silicone, TSF451, Methylphenylpolysiloxane (Shin-Etsu Silicone, KF)
54, TSF431) manufactured by Toshiba Silicone Co., Ltd., and the like.

Examples of the organoaluminum compound include aluminum acylate, aluminum chelate, and aluminum coupling agent having at least one of an acyl group and an alkoxyl group in its chemical structure. Specific examples of such an organoaluminum compound include, for example, acetoalkoxyaluminum diisopropylate (AL-M manufactured by Ajinomoto Co., Inc.), aluminum bisethylacetoacetate monoacetylacetonate (Kawaken Fine Chemicals Co., aluminum chelate D). Etc. can be mentioned.

Examples of the organic titanium compound include titanium acylate, titanium chelate, and titanate coupling agent having at least one of an acyl group and an alkoxyl group in the chemical structure, and further, containing sulfur. Examples thereof include a titanate coupling agent having an organic sulfur functional group or a phosphorus-containing organic phosphorus functional group in its chemical structure. Specific examples of such an organic titanium compound include, for example, tetraoctyl bis (ditridecyl phosphite) titanate (manufactured by Ajinomoto Co., KR46B), bis (dioctyl pyrophosphate) oxyacetate titanate (manufactured by Ajinomoto Co., KR138S), isopropyl. Tricumyl phenyl titanate (Ajinomoto Co., KR34
S) etc. can be mentioned.

Examples of the organic zirconium compound include zirconium acylate, zirconium chelate, and zirconium coupling agent having at least one of an acyl group and an alkoxyl group in its chemical structure. Specific examples of such an organic zirconium compound include, for example, zirconium acetylacetonate bisethylacetoacetate (manufactured by Matsumoto Yushi-Seiyaku Co.,
ZC-570), zirconium bisacetylacetonate (ZC-550 manufactured by Matsumoto Yushi-Seiyaku Co., Ltd.) and the like.

[0048]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. Example 1 Formation of Hydrated Oxide 100 L of a slurry (300 g / L TiO ₂ ) obtained by stirring and dispersing anatase type titanium dioxide was heated to 70 ° C., and sodium aluminate and Al ₂ O ₃ were heated therein. 240 g was added. After that, sulfuric acid was added to adjust the pH to 7 to perform a hydrous alumina coating treatment. After aging for 1 hour, it was filtered, washed with water, and dried.

Treatment of Reactive Polysiloxane To 20 kg of the powder obtained above, 100 g of hydrogenmethylpolysiloxane was added and mixed, and the mixture was supplied to a jet mill and ground. Treatment of Organometallic Compound 50 g of γ-glycidoxypropyltrimethoxysilane was added to 10 kg of powder which had been subjected to coating treatment by adding hydrogenmethylpolysiloxane, followed by high-speed stirring and mixing with a Henschel mixer to perform coating treatment. It was Kneading with resin 15 parts by weight of the powder obtained above and 100 parts by weight of polycarbonate (Lexan 101, manufactured by Nippon GE Plastics Co., Ltd.) were put into an injection molding machine and molded to prepare a piece for Izod strength test.

Comparative Example 1 An Izod strength test piece was obtained in the same manner as in Example 1 except that the hydrogen methyl polysiloxane treatment and the organometallic compound treatment were not performed. Comparative Example 2 Example 1 except that the organometallic compound treatment was not performed.
A piece for Izod strength test was obtained in the same manner as in. Comparative Example 3 An Izod strength test piece was obtained in the same manner as in Example 1 except that hydrogenmethylpolysiloxane was not added.

Example 2 Production of Hydrated Oxide 100 L of a slurry (300 g / L TiO ₂ ) obtained by stirring and dispersing anatase type titanium dioxide was heated to 70 ° C., and sodium silicate and SiO ₂ were added therein. 1 as ₂
50 g was added. After that, sulfuric acid was added to adjust the pH to 7, thereby performing a hydrous silica coating treatment. Subsequently, sodium aluminate was added as Al ₂ O ₃ to 45
0 g was added. Thereafter, sulfuric acid was added to adjust the pH to 7 again to perform a hydrous alumina coating treatment.
After aging for 1 hour, it was filtered, washed with water, and dried.

Treatment of Reactive Polysiloxane 20 g of the powder obtained above was added and mixed with 100 g of hydrogenmethyl polysiloxane and supplied to a jet mill for pulverization. Treatment of Organometallic Compound Hydrogen methyl polysiloxane was added, and 50 g of zirconium acetylacetonate bisethylacetoacetate was added to 10 kg of the powder subjected to the coating treatment, and the mixture was subjected to high-speed stirring and mixing with a Henschel mixer to perform the coating treatment. . Kneading with resin 15 parts by weight of the powder obtained above and 100 parts by weight of polycarbonate (Lexan 101, manufactured by Nippon GE Plastics Co., Ltd.) were put into an injection molding machine and molded to prepare a piece for Izod strength test.

Comparative Example 4 An Izod strength test piece was obtained in the same manner as in Example 2 except that the hydrogen methyl polysiloxane treatment and the organometallic compound treatment were not performed. Comparative Example 5 Example 2 except that the organometallic compound treatment was not performed.
A piece for Izod strength test was obtained in the same manner as in. Comparative Example 6 A piece for Izod strength test was obtained in the same manner as in Example 2 except that hydrogenmethylpolysiloxane was not added.

The fillers and Izod strength test pieces of the above Examples and Comparative Examples were evaluated by the following methods. Base amount measurement method A back titration method was performed by adding an excess amount of dilute nitric acid to the target filler and quantifying the remaining consumption amount. First, 1.0 g of the target filler was precisely weighed and put in a 50 ml Erlenmeyer flask with a ground stopper, and then dried at 110 ° C. for 2 hours. After adding 30 ml of a methanol solution of 0.003 N adsorption reagent (nitric acid), ultrasonic dispersion was performed for 1 hour, and the mixture was allowed to stand in a refrigerator overnight. Then, at 0 to -10 ° C, 30 rpm at 5000 rpm
After centrifuging with a centrifuge for minutes, the supernatant was sampled and then allowed to stand at room temperature. 10 ml of this sample was diluted with 50 ml of methanol, and the amount of base was measured with a potentiometric titrator. The amount of base was calculated by using potassium methoxide (0.003N methanol solution) as a titration reagent and measuring the amount of diluted nitric acid consumed.

Izod strength test method It was carried out in accordance with JIS K6719. The testing machine is Izod Impact Tester JIS K711
0 (manufactured by Toyo Seiki Co., Ltd.) was used, and the weighing amount was 2.75 J and the hammer lifting angle was 150 °. Thermal Discoloration Test Method The Izod strength test pieces were visually evaluated. Those with no discoloration were evaluated as ◯, those with some discoloration were evaluated as x, and those with severe discoloration were evaluated as xx. The results are shown in Table 1. In addition, the content ratio of each coating compound in the fillers obtained in each of the above Examples and Comparative Examples is also shown in Table 1 as a weight% with respect to titanium dioxide. In Table 1,
% Is% by weight. In Table 1, HDMP represents hydrogen methyl polysiloxane. GPMS stands for γ-glycidoxypropyltrimethoxysilane. ZAB
A represents zirconium acetylacetonate bisethylacetoacetate.

[0056]

[Table 1]

The following facts were clear from Table 1. The samples of Comparative Example 1 and Comparative Example 4 treated only with the hydrated oxide were:
The amount of base was remarkably high, heat discolored violently, and Izod strength was very poor. The samples of Comparative Examples 3 and 6 which were treated with the hydrated oxide and the organometallic compound had a high amount of base, deteriorated resin, and had poor heat discoloration resistance and Izod strength. The samples of Comparative Example 2 and Comparative Example 5, which were treated with the reactive polysiloxane after being treated with the hydrated oxide, had the amount of base suppressed to about 40% or less as compared with the case of no treatment, and the heat discoloration resistance was improved. However, the Izod strength was insufficient. In the samples of Examples 1 and 2 which were treated with a hydrated oxide and a reactive polysiloxane and further treated with an organometallic compound, the amount of base was suppressed low, and the heat discoloration resistance was improved.
The Izod strength was very good.

[0058]

EFFECTS OF THE INVENTION Since the present invention has the above-mentioned constitution, it is possible to obtain a resin composition having both sufficient heat discoloration resistance and mechanical strength, and particularly a magnetic card such as a liquid crystal display reflector and a telephone card. It is suitable for use as paint components.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location C08L 101/00 C08L 101/00 (72) Inventor Takashi Yamamoto 110 Tadashi, Shimokawa, Izumi-cho, Iwaki, Fukushima Address: Sakai Chemical Industry Co., Ltd., Onahama Plant

Claims (6)

[Claims] 1. A resin composition comprising an inorganic filler having a base amount of 20 μmol / g or less. 2. A base amount of at least one selected from the group consisting of titanium dioxide, zinc oxide, zinc sulfide, barium sulfate, α-ferric oxide, ferric tetroxide and γ-ferric oxide. Of 20 μmol / g or less is contained in the resin composition. 3. At least one fine powder selected from the group consisting of titanium dioxide, zinc oxide, zinc sulfide, barium sulfate, α-ferric oxide, ferric tetroxide and γ-ferric oxide, After coating with 0.2 to 5.0% by weight of the fine powder of hydrated oxide of at least one of hydrous silica and hydrous alumina, the fine powder of 0.
It is coated with 1 to 5.0% by weight of reactive polysiloxane, and the surface thereof is 0.1 to 2.
A filler having a base amount of 20 μmol / g or less prepared by coating with 0% by weight of an organometallic compound consisting of at least one of an organosilicon compound, an organoaluminum compound, an organotitanium compound and an organozirconium compound. A resin composition comprising: 4. The resin is a polycarbonate resin,
The resin composition according to claim 1, 2 or 3, which is a resin composition for a liquid crystal display reflection plate or a resin composition for a highway sound insulation plate. 5. The resin composition according to claim 1, 2 or 3, wherein the resin is a polyethylene terephthalate resin and the resin composition is a magnetic card resin composition. 6. The resin composition according to claim 1, 2 or 3, wherein the resin is a polyester resin and the resin composition is a paint component.