Thermoplastic resin composition and resin molded product

Abstract

The present invention relates to a thermoplastic resin composition comprising an aromatic polycarbonate resin (component A) [which may comprise an aromatic polycarbonate resin (component A1) and a thermoplastic resin other than the aromatic polycarbonate resin (component A2)], a granular talc (component B) having a bulk density of 0.4 to 1.5 g / mL which is obtained by granulating a talc having an average particle size of 0.1 to 10 μm, a rubber polymer (component C; optional component), a flame retardant (component E; optional component) and a fluorinated polyolefin (component F; optional component), wherein the granular talc (component B) has a particle size in which a proportion of a 500 μm-mesh screen residue thereof is not less than 55% by weight; as well as a resin molded product obtained by molding the thermoplastic resin composition. The thermoplastic resin composition and the resin molded product are excellent in extrusion moldability, rigidity, flame retardant, impact resistance and thermal stability, and exhibit an excellent balance between these properties.

Description

TECHNICAL FIELD[0001]The present invention relates to a thermoplastic resin composition and a resin molded product, and more particularly, to a thermoplastic resin composition obtained by incorporating a specific granular talc into a resin component comprising an aromatic polycarbonate resin which is enhanced in thermal stability, impact resistance, rigidity, extrusion moldability and flame retardancy, and exhibits an excellent balance between these properties, and a resin molded product obtained from the thermoplastic resin composition.BACKGROUND ART[0002]Aromatic polycarbonate resins have been used as general-purpose engineering plastics in various extensive applications such as parts of electric, electronic and OA equipments, mechanical parts and vehicle parts because the resins are excellent in various properties such as transparency, impact resistance, heat resistance and dimensional stability. In addition, polymer alloys comprising an aromatic polycarbonate resin and a thermop...

AI Technical Summary

Benefits of technology

[0045]The thermoplastic resin composition as described in the first aspect of the present invention has such an advantage that the resin composition is excellent in all of thermal stability, impact resistance and rigidity, and exhibits an excellent balance between these properties. The thermoplastic resin composition according to the first aspect of the present invention which has the above advantage can be used in various extensive applications. Specific examples of the applications of the thermoplastic resin composition according to the first aspect of the present invention include parts of electric and electronic equipments, parts of OA equipments, mechanical parts, vehicle parts, building members, various containers, leisure goods, sundries, various housings for cellular phones, etc. In addition, the thermoplastic resin composition according to the first aspect of the present invention can also be suitably used especially as exterior parts, outside plate parts and interior parts for vehicles because the resin composition is excellent in not only a balance between thermal stability, impact resistance and rigidity, but also chemical resistance and appearance.

[0046]The thermoplastic resin composition as described in the second aspect of the present invention has such an advantage that the resin composition is excellent in thermal stability, impact resistance and rigidity. The thermoplastic resin composition according to the second aspect of the present invention which has the above advantage can be used in various extensive applications. Specifically, the thermoplastic resin composition according to the third aspect of the present invention can be usefully used in the applications such as electric and electronic equipments or parts thereof, OA equipments, information terminal equipments, mechanical parts, domestic appliances, vehicle parts, building members, various containers, leisure goods, sundries, various illumination equipments, etc. In particular, it is expected that the thermoplastic resin composition according to the third aspect of the present invention can also be applied to housing members for electric and electronic equipments, OA equipments and information terminal equipments, and exterior parts, outside plate parts and interior parts for vehicles.

[0047]The thermoplastic resin composition as described in the third aspect of the present invention has such an advantage that the resin composition is enhanced in all of extrusion moldability, rigidity, flame retardant, impact resistance and thermal stability, and exhibits an excellent balance between these properties. The thermoplastic resin composition according to the third aspect of the present invention which has the above advantage can be used in various extensive applications. Specifically, the thermoplastic resin composition according to the fifth aspect of the present invention can be usefully used in the applications such as parts of electric and electronic equipments, OA equipments, mechanical parts, vehicle parts, building members, various containers, leisure goods, sundries, and parts of information terminal equipments such as cellular phones. In particular, the thermoplastic resin composition according to the fifth aspect of the present invention are suitably used especially as parts of electric and electronic equipments, parts of OA equipments and parts of information terminal equipments.

[0048]Specific examples of the housing members and parts of electric and electronic equipments, OA equipments and information terminal equipments include displays of personal computers, game equipments, televisions, etc., and housing members or inside parts of printers, copying machines, scanners, facsimiles, electronic pocket books or PDA, battery packs, cameras, video cameras, cellular phones, driving devices or readers for recording media, etc.

[0049]Specific examples of the exterior parts and outside plate parts for vehicles include outer door handles, bumpers, fenders, door panels, trunk lids, front panels, rear panels, roof panels, bonnets, pillars, side moldings, garnishes, wheel caps, hood bulges, fuel lids, various spoilers, and cowlings of motorcycles. Specific examples of the interior parts for vehicles include inner door handles, center panels, instrument panels, console boxes, luggage floor boards, and housings of displays for car navigation, etc.PREFERRED EMBODIMENTS FOR CARRYING OUT THE INVENTION

[0050]The present invention is described in detail below. However, the following detailed descriptions are concerned with only typical examples of preferred embodiments of the present invention, and not intended to limit the scope of the present invention thereto. In the following descriptions, the thermoplastic resin composition is occasionally referred to merely as a “resin composition”. Meanwhile, in the present specification, the “group” contained in various compounds involves both substituted and unsubstituted groups, unless departing from the scope of the present invention.

Problems solved by technology

However, when the glass fiber is blended in the polymer alloys, a molded product obtained from such polymer alloys tends to be deteriorated in appearance on the surface thereof, resulting in only limited applications to exterior parts and outside plate parts for vehicles requiring a good appearance.

On the other hand, although the resin composition containing a talc provides a molded product having a good appearance, decomposition of the aromatic polycarbonate resin as well as transesterification reaction between the aromatic polycarbonate resin and the thermoplastic polyester resin tend to excessively proceed owing to a strong basicity of the talc, resulting in poor thermal stability of the resin composition.

However, in these conventional techniques, the obtained resin compositions tend to be unsatisfactory in thermal stability and impact resistance.

However, in the conventional techniques specifically illustrated in these Patent Documents, the obtained resin compositions are still unsatisfactory in thermal stability and impact resistance.

However, the technique described in the Patent Document 8 neither teaches nor suggests the above problems caused upon blending the talc in the aromatic polycarbonate resins.

Therefore, it is not possible to obtain a resin composition having satisfactory thermal stability and impact resistance only by blending the granular talc in the aromatic polycarbonate resins.

These resin compositions exhibit a high flame retardancy, but suffer from the problem concerning high burden on environments.

Further, the aromatic polycarbonate resins tend to be deteriorated in fluidity.

However, the resin compositions obtained by blending the talc in aromatic polycarbonate resins tend to suffer from problems such as decomposition of the aromatic polycarbonate resins and, therefore, poor thermal stability and impact resistance owing to a strong basicity of the talc, notwithstanding such an advantage that the molded product obtained therefrom can exhibit a good appearance.

Further, the resin compositions containing the non-halogen-based flame retardant also tend to suffer from such a problem that the flame retardancy of these compositions is deteriorated as the content of the talc therein increases.

However, in the conventional techniques described in these Patent Documents, the obtained resin compositions are still unsatisfactory in flame retardancy and thermal stability.

Further, when blending a talc having a small particle size in the resin compositions, there tend to arise problems such as clogging of a hopper, deteriorated extrusion moldability such as poor intrusion into an extruder, and poor impact resistance of the resultant resin composition owing to poor dispersion of the talc therein.

However, in these Patent documents, no specific examples concerning such features of the resin compositions are described, and further the obtained resin compositions are still unsatisfactory in extrusion moldability, flame retardancy, impact resistance and thermal stability.

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