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Polycarbonate resin composition

A technology of polycarbonate resin and resin composition, which can be applied in the directions of instruments, lighting and heating equipment, flat/plate-shaped light guides, etc., can solve the problems of silver streak marks, limitations, and insufficiency on the surface of molded products, and achieve long-term stability. Good properties, suppressing the rise of YI value, and reducing the effect of hue change

Inactive Publication Date: 2019-09-20
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] However, in the method of Patent Document 1, since the polyoxyalkylene glycol used has low heat resistance, when molding is performed at a temperature higher than 340° C., or when the molding cycle becomes longer, the yellowing becomes more severe. Significant, may adversely affect optical properties such as brightness and light transmittance of molded products
In addition, there is a possibility of silver streaks on the surface of the molded product due to the decomposition gas of polyoxyalkylene glycol
Therefore, in the method of Patent Document 1, the means of increasing the temperature in order to improve the fluidity is substantially limited, and it is not suitable for forming thin-walled and large-area light guide plates.
In addition, polycarbonate resin compositions for optical moldings such as light guide plates require long-term stability of optical characteristics after molding, which is not sufficient at all.

Method used

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  • Polycarbonate resin composition
  • Polycarbonate resin composition
  • Polycarbonate resin composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～12 and comparative example 1～7

[0183] In each example, each component was mixed in the mass ratio shown in Table 1 to prepare a polycarbonate resin composition, and molded by the following method to produce molded articles (I) to (III) and used for various evaluations.

[0184] [Production of molded product (I)]

[0185] Using a vented twin-screw extruder with a screw diameter of 37 mm ("TEM-37SS" manufactured by Toshiba Machine Co., Ltd.), the polycarbonate resin composition was melt-kneaded at a cylinder temperature of 240° C., and cut by strands. got pellets. The obtained granules were dried at 120° C. for 5 to 7 hours using a hot air circulation dryer. The dried pellets were used Toshiba EC40N electric injection molding machine manufactured by Toshiba Machine Co., Ltd., using a single-cavity mold that formed a product with a length of 40mm x width 80mm x thickness 3.2mm, at a cylinder temperature of 350°C, a mold temperature of 80°C, Injection molding was performed for 20 injections or more under the ...

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Abstract

A polycarbonate resin composition that maintains excellent color tone with little yellowing even with retention inside a high-temperature molding machine exceeding 340DEG C, has little change in color tone over time even when a molded article molded after retention under high-temperature conditions undergoes thermal history, and has exceptional long-term stability of the optical properties, wherein the polycarbonate resin composition contains prescribed amounts of a polycarbonate resin (A), a specific polyether compound (B), and a specific antioxidant (C).

Description

technical field [0001] The present invention relates to polycarbonate resin compositions. Background technique [0002] Aromatic polycarbonates are excellent in transparency, mechanical properties, thermal properties, electrical properties, and weather resistance, and are used in optical moldings such as light guide plates, lenses, and optical fibers by making use of their properties. However, the light transmittance which is an index indicating its transparency is lower than that of polymethyl methacrylate (PMMA) and the like. Therefore, when the surface light source body is composed of a light guide plate made of aromatic polycarbonate and a light source, there is a problem of low brightness. Therefore, development of a method for improving the brightness and light transmittance of light guide plates made of aromatic polycarbonate is underway. [0003] In particular, light guide plates have been further thinned in recent years, and thin-walled molding is performed in ord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L69/00C08K5/524C08L71/02G02B6/00
CPCC08L69/00C08K5/526C08L71/02C08K5/1515C08K5/005F21S2/00G02B6/0011C08K5/524
Inventor 鸟居孝洋山崎康宣
Owner IDEMITSU KOSAN CO LTD
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