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

[0030]An object of the present invention is to overcome the above problems encountered in the prior art, and provide a thermoplastic resin composition capable of exhibiting excellent extrusion moldability, rigidity, flame retardancy, impact resistance and thermal stability, and an excellent balance between these properties, as well as a resin molded product obtained from the thermoplastic resin composition.

[0031]As a result of the present inventors' earnest study for solving the above conventional problems, it has been found that (1) the thermoplastic resin composition prepared by blending a granular talc having specific bulk density and particle size in a specific resin composition mainly comprising an aromatic polycarbonate resin and a thermoplastic resin other than the aromatic polycarbonate resin can be enhanced in all of thermal stability, impact resistance and rigidity, and exhibit an excellent balance between these properties; (2) the thermoplastic resin composition prepared by blending a specific amount of a rubber polymer in a resin composition mainly comprising an aromatic polycarbonate resin and a granular talc having specific bulk density and particle size can exhibit excellent thermal stability, impact resistance and rigidity; and (3) the thermoplastic resin composition prepared by blending a specific granular talc and a specific flame retardant in a resin component comprising an aromatic polycarbonate resin can be enhanced in all of extrusion moldability, rigidity, flame retardancy, impact resistance and thermal stability, and exhibit an excellent balance between these properties. The present invention has been attained on the basis of the above finding.

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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