JPH06256632A - Polycarbonate resin composition - Google Patents

Abstract

PURPOSE:To improve the impact resistance by incorporating an inorganic filler and an organopolysiloxane represented by a specified formula into a polycarbonate resin. CONSTITUTION:100 pts.wt. polycarbonate resin having structural repeating units of formula I (wherein (x) is halogen or 1-8C alkyl; (a) and (b) are each 0 to 4; and Y is a single bond, 1-8C alkylene, 2-8C alkylidene, 5-15C cycloalkylene, 5-15C cycloalkylidene, S, SO, O, CO, etc.) is mixed with 0.01-50 pts.wt. of at least one inorganic filler selected from talc, mica and K2TiO3 whisker, and 0.001-5 pts.wt. organopolysiloxane having oeganisilyl groups bound to an Si atom through a divalent hydrocarbon and represented by formula II [wherein R<1> is monovalent hydrocarbon group; and A is a monovalent hydrocarbon group or a group of formula III (wherein R<2> is a bivalent hydrocarbon group; R<3> and R<4> are each a monovalent hydrocarbon group; and (x) is 0 to 2)]. The mixture is kneaded at 250-300 deg.C through, e.g. a twin-screw extruder to give the objective resin composition excellent in impact resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polycarbonate resin composition, and more specifically to a machine having excellent appearance and impact resistance in which the decrease in the molecular weight of the polycarbonate due to the incorporation of the inorganic filler is suppressed and the moldability is excellent. The present invention relates to a polycarbonate resin composition capable of obtaining a molded product having excellent physical properties.

[0002]

2. Description of the Related Art Polycarbonate resins have mechanical strength (particularly impact resistance),
It has excellent electrical properties and transparency, and is widely used as an engineering plastic in various fields such as electric and electronic equipment and automobiles. When a polycarbonate resin having such characteristics is mainly used for exterior parts in the field of automobiles, there is an increasing demand for a material having an improved appearance and increased rigidity, and a material having a low linear expansion coefficient. Conventionally, in order to meet such needs, talc, mica, potassium titanate whiskers, etc., which are more excellent in appearance, have come to be used in place of the glass fibers most often used in polycarbonate resins. However, when these effective inorganic fillers are blended with the polycarbonate resin, there is a problem that the molecular weight of the polycarbonate resin is significantly reduced. As a result, there is a problem that the impact resistance is significantly deteriorated and the original properties of the polycarbonate resin are largely impaired. Further, there is a problem that the thermal stability in the molding machine is deteriorated as the molecular weight is lowered.

[0003]

Therefore, the present inventors have
In view of the above situation, the inventors have conducted intensive studies to solve the drawbacks of the conventional method and to develop a polycarbonate resin composition having a small decrease in the molecular weight of the polycarbonate resin and excellent thermal stability. In development, by reducing the chances of contact between polycarbonate resin and various fillers,
I thought that the purpose would be achieved. Based on this idea,
For coating the surface of various fillers, various compounds that chemically bond with each other were investigated by focusing on reactive groups such as OH groups existing on the surface of the filler. As a result, they have found that the use of a chemically-bonding reactive silicone makes it possible to obtain a polycarbonate resin composition having a desired property, in which the decrease in the molecular weight of the polycarbonate resin is small and the process stability is excellent. The present invention is
It was completed based on this knowledge. That is,
The present invention comprises (A) 100 parts by weight of a polycarbonate resin,
(B) Inorganic filler (excluding white pigment) 0.01 to 5
A polycarbonate resin composition comprising 0 parts by weight and (C) 0.001 to 5 parts by weight of an organopolysiloxane containing an organooxysilyl group bonded to a silicon atom via a divalent hydrocarbon group. To do.

First, as the polycarbonate resin (PC) as the component (A) which constitutes the resin composition of the present invention,
There are various things. Preferably, the general formula (III)

[0005]

[Chemical 2]

[In the formula, X is a halogen atom (eg, chlorine, bromine, fluorine, iodine) or an alkyl group having 1 to 8 carbon atoms (eg, methyl group, ethyl group, propyl group, n-butyl group, Isobutyl group, amyl group, isoamyl group, hexyl group, etc.), and when this X is plural,
They may be the same or different,
a and b are each an integer of 0-4. And Y
Is a single bond, an alkylene group having 1 to 8 carbon atoms or 2 carbon atoms.
~ 8 alkylidene group (for example, methylene group, ethylene group, propylene group, butylene group, penterylene group, hexylene group, ethylidene group, isopropylidene group, etc.),
A cycloalkylene group having 5 to 15 carbon atoms or 5 to 1 carbon atoms
5 cycloalkylidene group (for example, cyclopentylene group, cyclohexylene group, cyclopentylidene group, cyclohexylidene group, etc.), or -S-, -SO-, -S
_{O 2 -, - O -,} - CO- bond or formula (IV) or
(IV ')

[0007]

[Chemical 3]

The bond represented by ] It is a polymer which has a repeating unit represented by the following formula. The polycarbonate resin may be various ones, but is usually represented by the general formula (V)

[0009]

[Chemical 4]

It is easily produced by reacting a dihydric phenol represented by the formula (wherein X, a, b and Y are the same as above) with a carbonate precursor such as phosgene or a carbonate compound. be able to. That is, for example, by reacting a dihydric phenol with a carbonate precursor such as phosgene in a solvent such as methylene chloride in the presence of a known acid acceptor or a molecular weight regulator, or by reacting dihydric phenol with diphenyl carbonate. It is produced by a transesterification reaction with another carbonate precursor.

There are various dihydric phenols represented by the general formula (V), but 2,2-bis (4-hydroxyphenyl) propane [bisphenol A] is particularly preferable. As dihydric phenols other than bisphenol A, bis (4-hydroxyphenyl) alkanes other than bisphenol A; 1,1- (4-hydroxyphenyl) methane; 1,1- (4-hydroxyphenyl)
Ethane; 4,4'-dihydroxydiphenyl; bis (4
-Hydroxyphenyl) cycloalkane; bis (4-hydroxyphenyl) oxide; bis (4-hydroxyphenyl) sulfide; bis (4-hydroxyphenyl)
Sulfone; bis (4-hydroxyphenyl) sulfoxide; bis (4-hydroxyphenyl) ether; bis (4-hydroxyphenyl) ketone and bis (3,5)
-Dibromo-4-hydroxyphenyl) propane; halogenated bisphenols such as bis (3,5-dichloro-4-hydroxyphenyl) propane, and the like. In addition to these, examples of the dihydric phenol include hydroquinone. These dihydric phenols may be used alone or in combination of two or more. Examples of the carbonic acid ester compound include diaryl carbonate such as diphenyl carbonate and dialkyl carbonate such as dimethyl carbonate and diethyl carbonate. Furthermore, as the molecular weight regulator,
Any commonly used one may be used, for example,
In addition to aromatic phenols such as phenol, p-tert-butylphenol, p-cumylphenol, p-tert-octylphenol and tribromophenol, and aliphatic alcohols such as methanol and butanol, mercaptan, phthalimide and the like can be mentioned.

The polycarbonate resin may be a homopolymer using one of the above dihydric phenols or a copolymer using two or more thereof. Further, it may be a thermoplastic random branched polycarbonate resin obtained by using a polyfunctional aromatic compound in combination with the dihydric phenol. Further, it may be a polycarbonate-polyorganosiloxane copolymer composed of an organosiloxane block having a number average degree of polymerization of 5 or more.
Further, it may be a mixture of two or more of these various polycarbonate resins. The polycarbonate resin used in the present invention has a viscosity average molecular weight of 10,000 to 100, from the viewpoint of mechanical strength and moldability.
000 is preferable, and particularly 15,000 to 40,000.
Are preferred.

The inorganic filler as the component (B) used together with the polycarbonate resin as the component (A) preferably contains a group reactive with the polycarbonate resin as the component (A). Generally, an inorganic filler has an OH group or the like that easily adsorbs moisture and is reactive with a polycarbonate resin. Therefore, in the present invention, as the inorganic filler containing a group that is reactive with the polycarbonate resin as the component (A), those generally used may be used, and there are various types. Specifically, for example, in the fibrous filler, potassium titanate whiskers, mineral fibers (eg rock wool), glass fibers, carbon fibers, metal fibers (eg stainless steel fibers), aluminum borate whiskers, silicon nitride whiskers, Examples include boron fibers, tetrapod-shaped zinc oxide whiskers, and wollastonite. Examples of the plate-shaped filler include talc, mica, pearl mica, glass flakes (amorphous), aluminum foil, kaolin and the like. Furthermore, for spherical fillers, calcium carbonate, glass beads, glass balloons,
Carbon black (granular), glass powder (amorphous)
Etc. Among these, ultrafine fibers (diameter 1 μm or less) such as potassium titanate whiskers and aluminum borate whiskers, which have excellent surface smoothness, talc,
Fine filler such as mica and calcium carbonate (major axis 20μ
m or less) is particularly preferably used.

The organopolysiloxane (hereinafter abbreviated as "organopolysiloxane") containing an organooxysilyl group bonded to a silicon atom via a divalent hydrocarbon group as the component (C) is a component of the present invention. It has a function of suppressing a decrease in the molecular weight of the polycarbonate resin constituting the polycarbonate resin composition and maintaining impact resistance and thermal stability. Therefore, it is an essential component in the polycarbonate resin composition of the present invention. There are various organopolysiloxanes as the component (C), and specifically,
Examples thereof include linear, cyclic, reticulated and partially branched linear organopolysiloxanes containing an organooxysilyl group bonded to a silicon atom via a divalent hydrocarbon group. In particular, a straight-chain organopolysiloxane containing an organooxysilyl group bonded to a silicon atom via a divalent hydrocarbon group is preferable. Examples of the organopolysiloxane containing an organooxysilyl group bonded to a silicon atom through such a divalent hydrocarbon group include linear organopolysiloxanes represented by the general formula (I).

[0015]

[Chemical 5]

[In the formula, R ¹ represents a monovalent hydrocarbon group, and A 1
Monovalent hydrocarbon radical or formula _{^{(II) -R 2 SiR 3 x}} (OR 4) (3-x) ··· (II) ( wherein, R ² is a divalent hydrocarbon radical, R ³ And R ⁴ represent a monovalent hydrocarbon group, and x represents an organooxysilyl group-containing monovalent hydrocarbon group represented by x). However, at least one of A represents an organooxysilyl group-containing monovalent hydrocarbon group. Also, m is 1 to
Is an integer of 300, n is an integer of 0 to 300, and m + n is an integer of 0 to 300. ] It is an organopolysiloxane represented by this.

Here, in the general formula (I), the monovalent hydrocarbon group represented by R ¹ is specifically a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group or the like. Alkenyl group, vinyl group, allyl group, butenyl group, pentenyl group, alkenyl group such as hexenyl group,
Examples include aryl groups such as phenyl, tolyl, and xylyl groups, aralkyl groups such as benzyl and phenethyl groups, and substituted alkyl groups such as chloromethyl group, chloropropyl group, and 3,3,3-trifluoropropyl group. It And
The monovalent hydrocarbon group represented by A is the same as above. On the other hand, in the general formula (II), the divalent hydrocarbon group represented by R ² is specifically exemplified by alkylene groups such as methylmethylene group, ethylene group, methylethylene group, propylene group and butylene group. It The monovalent hydrocarbon group represented by R ³ and R ⁴ is the same as above, and specific examples of the organooxysilyl group-containing monovalent hydrocarbon group include:
Trimethoxysilylethylene group, triethoxysilylethylene group, dimethoxyphenoxysilylpropylene group,
Examples thereof include a trimethoxysilylpropylene group, a trimethoxysilylbutylene group, a methyldimethoxysilylpropylene group and a dimethylmethoxysilylpropylene group. The molecular weight of the component (C) is not particularly limited, and it is possible to suppress a decrease in the molecular weight of the polycarbonate resin in the polycarbonate resin composition of the present invention. Therefore, in the general formula (I), m and n are respectively , M is 1 to 30
Is an integer of 0, n is an integer of 0 to 300, and m
It is desirable that + n is an integer of 1 to 300.

The organopolysiloxane as the component (C) can be obtained by various methods. For example, it can be produced by subjecting an organopolysiloxane having a silicon atom-bonded hydrogen atom and an organooxysilyl group to a hydrocarbon compound having an aliphatic unsaturated hydrocarbon bond in the presence of a platinum-based catalyst. Also,
It can be produced by subjecting a hydrocarbon group-containing organopolysiloxane having an aliphatic unsaturated hydrocarbon bond and an organooxysilane having a silicon atom-bonded hydrogen atom to an addition reaction in the presence of a platinum-based catalyst.

The resin composition of the present invention comprises the above-mentioned components (A), (B) and (C), and the mixing ratio thereof is 100 parts by weight of the polycarbonate resin which is the component (A). In contrast, the inorganic filler which is the component (B)
0.01-50 parts by weight, preferably 0.1-45 parts by weight and (C) the organopolysiloxane 0.001-
5 parts by weight, preferably 0.01 to 3 parts by weight are blended. Here, if the component (B) is less than 0.01 parts by weight,
The rigidity does not improve sufficiently. On the other hand, if it exceeds 50 parts by weight, the specific gravity increases and the appearance deteriorates, which is not preferable. When the amount of the component (C) is less than 0.001 part by weight, the effect of suppressing the decrease in the molecular weight of the polycarbonate is small. On the other hand, if it exceeds 5 parts by weight, the kneading of the polycarbonate resin composition slips on the screw and the feed becomes unstable. Furthermore, there is a concern that the mechanical strength such as strength and rigidity may decrease, which is not preferable.

The resin composition of the present invention may optionally contain various additives or other synthetic resins, elastomers and the like as the component (D) within a range not impairing the object of the present invention. be able to. For example, as various additives, hindered phenol-based, phosphite-based, phosphate-based antioxidants, benzotriazole- and benzophenone-based UV absorbers, hindered amine-based light stabilizers, Examples include internal lubricants such as aliphatic carboxylic acid esters, paraffin, silicone oil and polyethylene wax, commonly used flame retardants, flame retardant aids, antistatic agents and colorants.

Here, as the hindered phenol-based antioxidant, BHT (2,6-di-tert-butyl-p) is used.
-Cresol), "Irganox 1076" (trade name) and "Irganox 1010" manufactured by Ciba-Geigy
(Trade name), "Ethyl 330" (trade name) manufactured by Ethyl Co., and "Sumilyzer GM" (trade name) manufactured by Sumitomo Chemical Co., Ltd. are preferably used. Examples of other synthetic resins include polyester (polyethylene terephthalate, polybutylene terephthalate, etc.), polyamide, polyarylate, polyethylene, polypropylene,
Examples of the resin include polymethyl methacrylate, polystyrene, ABS resin, AS resin, and polycarbonate other than the polycarbonate as the component (A). Examples of the elastomer include isobutylene-isoprene rubber, styrene-butadiene rubber, ethylene-propylene rubber, acrylic elastomer, core-shell type elastomer MBS, MAS and the like.

The resin composition of the present invention can be obtained by mixing the above-mentioned components (A), (B) and (C) with (D) if necessary and kneading. Then, for the compounding and kneading, a commonly used method, for example, a ribbon blender, a Henschel mixer, a Banbury mixer, a drum tumbler, a single screw extruder, a twin screw extruder, a co-kneader, a multi-screw extruder, etc. Can be done using. The heating temperature for kneading is usually selected in the range of 250 to 300 ° C. The polycarbonate resin composition thus obtained is
Various known molding methods, such as injection molding, blow molding,
Extrusion molding, compression molding, calender molding, rotational molding, etc. can be applied and can be used for manufacturing various molded products.

[0023]

The present invention will be further described in detail with reference to production examples, examples and comparative examples. Production Example 1 [Production of Polydimethylsiloxane Having Alkoxysilyl Group in Side Chain of Molecule] Hexamethyldisiloxane 151 g and octamethylcyclotetrasiloxane 482 were placed in a 1 liter round bottom flask equipped with a stirrer, a reflux machine and a thermometer.
g, 167 g of tetramethylcyclotetrasiloxane and 3.0 g of activated clay were charged and the temperature was 60 ° C with a mantle heater.
It was heated and stirred for 8 hours. After cooling, the mixture was filtered to obtain 760 g of a colorless transparent oily substance. The structure of the obtained oily substance is NM
It was determined by the R measurement as follows.

[0024]

[Chemical 6]

Then, the above oily product 24 was placed in a 500 ml round bottom flask equipped with a stirrer, a reflux condenser and a thermometer.
7 g, 153 g of vinyltrimethoxysilane and 0.15 g of a 3% alcohol solution of chloroplatinic acid were charged, and the mixture was heated with a mantle heater at 80 ° C. for 4 hours and stirred. 120 ° C,
After distilling under reduced pressure at 30 mmHg to remove excess vinyltrimethoxysilane, it was filtered to give a pale brown transparent oily substance 36.
3 g was obtained. The structure of the obtained oily substance was determined by NMR measurement as follows (type I).

[0026]

[Chemical 7]

Production Example 2 [Production of Polydimethylsiloxane Having Alkoxysilyl Group in Side Chain of Molecule] In a 1 liter round bottom flask equipped with a stirrer, a reflux machine, and a thermometer, 28 g of hexamethyldisiloxane and octamethylcyclotetra were prepared. Siloxane 700
g, 72 g of tetramethylcyclotetrasiloxane and 3.0 g of activated clay were charged, and the mixture was heated with a mantle heater at 60 ° C. for 8 hours and stirred. After cooling, the mixture was filtered to obtain 744 g of a colorless transparent oily substance. The structure of the obtained oily substance is NMR
The measurement was determined as follows.

[0028]

[Chemical 8]

Then, the above oily material 31 was placed in a 500 ml round bottom flask equipped with a stirrer, a reflux machine and a thermometer.
6 g, 84 g of vinyltrimethoxysilane and 0.15 g of a 3% alcohol solution of chloroplatinic acid were charged, and the mixture was heated with a mantle heater at 80 ° C. for 4 hours and stirred. 120 ° C, 3
After distilling under reduced pressure at 0 mmHg to remove excess vinyltrimethoxysilane, it was filtered to give a light brown transparent oil 367.
g was obtained. The structure of the obtained oily substance was determined by NMR measurement as follows (type II).

[0030]

[Chemical 9]

Production Example 3 [Production of polydimethylsiloxane having alkoxysilyl groups at both ends of the molecule] In a 1 liter round bottom flask equipped with a stirrer, a reflux machine and a thermometer, 92 g of tetramethyldisiloxane and octamethylcyclotetra were prepared. Siloxane 708
g and activated clay 3.0 g were charged, and the mixture was heated with a mantle heater at 60 ° C. for 8 hours and stirred. After cooling, the mixture was filtered to obtain 760 g of a colorless transparent oily substance. The structure of the obtained oily substance was determined by NMR measurement as follows.

[0032]

[Chemical 10]

Then, the above oily product 30 was placed in a 500 ml round bottom flask equipped with a stirrer, a reflux machine and a thermometer.
7 g, 73 g of vinyltrimethoxysilane and 0.15 g of a 3% alcohol solution of chloroplatinic acid were charged, and the mixture was heated with a mantle heater at 80 ° C. for 4 hours and stirred. 120 ° C, 3
After distilling under reduced pressure at 0 mmHg to remove excess vinyltrimethoxysilane, it was filtered to give a pale brown transparent oil 365.
g was obtained. The structure of the obtained oily substance was determined by NMR measurement as follows (type III).

[0034]

[Chemical 11]

Production Example 4-1 [Production of PC Oligomer] 60 kg of bisphenol A was dissolved in 400 liters of 5% sodium hydroxide aqueous solution to prepare an aqueous solution of bisphenol A sodium hydroxide. Then, a sodium hydroxide aqueous solution of bisphenol A kept at room temperature was introduced at a flow rate of 138 liters / hour and methylene chloride was introduced at a flow rate of 69 liters / hour through a orifice plate into a tubular reactor having an inner diameter of 10 mm and a tube length of 10 m, Flow phosgene in parallel to this, 10.7 kg /
It was blown in at a flow rate of time and reacted continuously for 3 hours. The tubular reactor used here was a double tube, and cooling water was passed through the jacket to keep the discharge temperature of the reaction solution at 25 ° C. Further, the pH of the discharged liquid was adjusted so as to show 10 to 11. The reaction solution thus obtained is allowed to stand, whereby the aqueous phase is separated and removed, and the methylene chloride phase (220
Liter) was collected. The methylene chloride was removed by evaporation to obtain a flake PC oligomer. P obtained here
The degree of polymerization of the C oligomer was 3-4.

Production Example 4-2 [Synthesis of Reactive PDMS] 1483 g of octamethylcyclotetrasiloxane, 18.1 g of 1,1,3,3-tetramethyldisiloxane and 35 g of 86% sulfuric acid were mixed,
It was stirred at room temperature for 17 hours. After that, the oil phase is separated,
25 g of sodium hydrogen carbonate was added and stirred for 1 hour. After filtration, vacuum distillation was performed at 150 ° C. and 3 torr to remove low-boiling substances. To a mixture of 60 g of 2-allylphenol and 0.0014 g of platinum as platinum chloride-alcoholate complex was added 294 g of the oil obtained above at a temperature of 90 ° C. The mixture was stirred for 3 hours while maintaining the temperature of 90 to 115 ° C. Extract the product with methylene chloride,
Excess 2-allylphenol was removed by washing 3 times with 80% aqueous methanol. The product was dried over anhydrous sodium sulphate and evaporated in vacuo to a temperature of 115 ° C. The obtained terminal phenol PDMS has a number of repeating dimethylsilanooxy units of 150 by NMR measurement.
Met.

Production Example 4-3 [Production of PC-PDMS Copolymer] 185 g of reactive PDMS obtained in Production Example 4-2 was dissolved in 2 liters of methylene chloride to prepare 10 liters of PC oligomer obtained in Production Example 4-1. Mixed with. There, 26 g of sodium hydroxide was added to 1 part of water.
Dissolved in liter and triethylamine 5.7cc
Was added and the mixture was stirred at 500 rpm for 1 hour at room temperature. Thereafter, 600 g of bisphenol A was dissolved in 5 liters of a 5.2 wt% sodium hydroxide aqueous solution, 8 liters of methylene chloride and p-tert-butylphenol 81.
g was added and the mixture was stirred at 500 rpm for 2 hours at room temperature. After that, 5 liters of methylene chloride was added, and further washed with 5 liters of water, washed with 5 liters of 0.01N aqueous sodium hydroxide solution with alkali, washed with 5 liters of 0.1N hydrochloric acid and washed with 5 liters of water. Finally, methylene chloride was removed to obtain a chip-shaped PC-PDMS copolymer. The obtained PC-PDMS copolymer had an Mv (viscosity average molecular weight) of 20,000, a PDMS chain length (n: dimethylsilanooxy units) of 150, and a PDMS content of 4% by weight. there were.

The viscosity average molecular weight (Mv), PDMS
The chain length (n: dimethylsilanooxy unit) and PDMS content were measured by the following methods. 1) Viscosity average molecular weight (Mv) The crushed molded product is dissolved in a methylene chloride solution, insoluble matter is removed by a filter, evaporated to form a film, and the film is dissolved again in methylene chloride.
The viscosity was measured with an Ubbelohde viscosity tube at ° C, and the intrinsic viscosity [η] was calculated from this, and then calculated by the following formula. [Η] = 1.23 × 10 ^-5 Mv ^0.83 2) PDMS chain length (n: number of dimethylsilanooxy units) ¹ H-NMR shows a peak of a methyl group of dimethylsiloxane at 0.2 ppm and 2.6 ppm. PC-P to be seen
It was determined by the intensity ratio of the methylene group peaks at the DMS bond. 3) PDMS content Bisphenol A found at 1.7 ppm in ¹ H-NMR
The intensity ratio of the isopropyl methyl group peak to the dimethylsiloxane methyl group peak at 0.2 ppm was determined.

Example 1 According to the compounding amount shown in Table 1, polycarbonate (P
C), talc and organopolysiloxane (type I) were dry blended, and then kneaded at 260 ° C. using a vented single-screw extruder [NVC-50, manufactured by Nakatani Machinery Co., Ltd.] to prepare pellets. 12 pellets obtained
After drying at 0 ℃ for 8 hours, molding temperature 280 ℃, mold temperature 80
A test piece was obtained by injection molding at ℃.

Example 2 The procedure of Example 1 was repeated, except that mica was used instead of talc as the inorganic filler. Example 3 Example 1 was repeated except that potassium titanate whiskers were used instead of talc as the inorganic filler.
It carried out similarly to.

Example 4 In Example 1, the organopolysiloxane (type II) is used.
Was carried out in the same manner as in Example 1 except that the compounding amount was changed. Example 5 The procedure of Example 1 was repeated, except that the blending amount of talc and the organopolysiloxane (type III) and the blending amount thereof were changed.

Example 6 Example 6 was carried out in the same manner as in Example 1 except that a PC-PDMS copolymer was used as the PC. Example 7 In Example 2, it implemented like Example 2 except having used the branched polycarbonate as PC.

Example 8 Example 8 was carried out in the same manner as in Example 1 except that glass powder was used instead of talc as the inorganic filler.

Comparative Example 1 The procedure of Example 1 was repeated except that the organopolysiloxane was not used. Comparative Example 2 The procedure of Comparative Example 1 was repeated, except that mica was used instead of talc as the inorganic filler. Comparative Example 3 Comparative Example 1 except that potassium titanate whiskers were used in place of talc as the inorganic filler in Comparative Example 1.
It carried out similarly to. Comparative Example 4 Comparative Example 1 was carried out in the same manner as Comparative Example 1 except that glass powder was used instead of talc as the inorganic filler.

For the test pieces obtained in the examples and comparative examples, as a quality evaluation, the change in the color tone of the Izod impact strength and its appearance was visually checked.
Further, the pellet and the test piece were crushed to measure the viscosity average molecular weight (Mv). In addition, the flow values were measured on the pellets. The results are shown in Table 2.

[0046]

[Table 1]

[0047]

[Table 2]

The raw materials used in the examples and comparative examples are as follows. (A) Polycarbonate (PC) Tufflon A2500 [manufactured by Idemitsu Petrochemical Co., Ltd.] Mv =
23,500 PC-PDMS copolymer [Production Example 4-3] TAFRON IB2500 [manufactured by Idemitsu Petrochemical Co., Ltd., branched polycarbonate] Mv = 23,500 (B) Talc: SWA (plate diameter about 10 μm) [Asada Milling Co., Ltd.] (C) Mica: M-325 (plate diameter: about 18 μm) [Repco Corporation] (D) Whiskers: Potassium titanate whiskers D10
2 [manufactured by Otsuka Chemical Co., Ltd.] (E) Glass powder (average particle size: about 70 μm) (F) Organopolysiloxane [manufactured by Toray Dow Corning Silicone Co., Ltd.] Example 1) Type I (Production Example 1) Methoxy group content 21.4 wt% Viscosity 20 cSt 2) Type II (Production Example 2) Methoxy group content 11.4 wt% Viscosity 85 cSt 3) Type III (Production Example 3) Methoxy group content 12.7 wt% Viscosity 15cSt

Further, each measurement in the quality evaluation was as follows. 1) Viscosity average molecular weight (Mv) The crushed molded product is dissolved in a methylene chloride solution, the insoluble matter is removed by a filter, evaporated to produce a film, and the film is dissolved again in methylene chloride.
The viscosity was measured with an Ubbelohde viscosity tube at ° C, and the intrinsic viscosity [η] was calculated from this, and then calculated by the following formula. [Η] = 1.23 × 10 ⁻⁵ Mv ^0.83 2) Flow value Based on JIS K-7210. Measurement temperature 280 ℃,
The load was measured at 160 kg. 3) Izod impact strength Based on JIS K-7110. 4) Appearance The change in color tone was visually evaluated. Judgment criteria ○: Small change in color tone, △: Medium change in color tone ×: Large change in color tone

[0050]

As described above, according to the polycarbonate resin composition of the present invention, the decrease in the molecular weight of the polycarbonate due to the incorporation of the inorganic filler is suppressed, the moldability is excellent, and the appearance, impact resistance, etc. A molded product having excellent mechanical properties can be obtained. Therefore, the polycarbonate resin composition of the present invention can be effectively used as a raw material for various molded products, particularly automobile parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuto Hashimoto 1 Anezaki Kaigan, Ichihara-shi, Chiba Idemitsu Petrochemical Co., Ltd. (72) Haruhiko Furukawa 2 Chizenkaigan 2 Ichihara, Chiba 2 Toray Dow Corning Silicone Co., Ltd.

Claims (3)

[Claims] 1. (A) 100 parts by weight of polycarbonate resin, (B) inorganic filler (excluding white pigment) 0.01
To 50 parts by weight and (C) 0.001 to 5 parts by weight of organopolysiloxane containing an organooxysilyl group bonded to a silicon atom via a divalent hydrocarbon group (0.001 to 5 parts by weight). 2. The polycarbonate resin composition according to claim 1, wherein the inorganic filler as the component (B) is at least one selected from talc, mica and potassium titanate whiskers. 3. The organopolysiloxane having an organooxysilyl group as the component (C) has the general formula (I): [In the formula, R ¹ represents a monovalent hydrocarbon group, A represents a monovalent hydrocarbon group or the general formula (II) -R ² SiR ³ _x (OR ⁴ ) _(3-x) ... (II) ( In the formula, R ² represents a divalent hydrocarbon group, R ³ and R ⁴ each represent a monovalent hydrocarbon group, and x is an integer of 0 to 2). Indicates a monovalent hydrocarbon group. However, at least one of A represents an organooxysilyl group-containing monovalent hydrocarbon group. Also, m
Is an integer of 1 to 300, n is an integer of 0 to 300, and m + n is an integer of 1 to 300. ] It is organopolysiloxane represented by these, The polycarbonate resin composition of Claim 1 characterized by the above-mentioned.