Polycarbonate resin composition, and molded article produced from the resin composition

Abstract

Disclosed are: a polycarbonate resin composition comprising 100 parts by mass of a polycarbonate, 0.01 to 0.15 part by mass of a phosphorous acid ester represented by general formula (I) or the like, and 0.01 to 0.15 part by mass of an organopolysiloxane compound having a phenyl group, a methoxy group and a vinyl group; and a molded article such as a light guide plate, a film or a sheet, which is produced by molding the resin composition. In the polycarbonate resin composition, the occurrence of yellow discoloration or the generation of silver can be reduced and the sticking of the resin composition onto a mold can also be reduced. The polycarbonate resin composition has excellent mold release properties. The molded article can be produced from the resin composition. (In the formula, R1's independently represent an aryl group or an alkyl group and may be the same as or different from each other.)

Description

technical field [0001] The present invention relates to a polycarbonate resin composition and a molded article made of the resin composition. Specifically, even if molded at a high temperature, no yellowing or silver streaks of the resin composition occur, excellent mold release properties, and reduced A polycarbonate resin composition with mold blocking and a molded article made of the resin composition are provided. Background technique [0002] In recent years, as liquid crystal displays have become thinner, injection-molded light guide plates with a thickness of 0.25 mm have been developed. However, the lack of fluidity of polycarbonate makes it very difficult to carry out injection molding of thin light guide plates. There are also frequent cases where polycarbonate cannot be molded under the generally recommended molding conditions of 280-320°C. Therefore, there are also cases where molding is performed at 360 to 380°C outside the usual conditions, and traces of air o...

AI Technical Summary

Problems solved by technology

[0004] However, in the polycarbonate resin described in Patent Document 1, only adding an antioxidant and a mold release agent, under the molding conditions of 360°C or higher, a large number of silver streaks, one of the poor appearance, will occur. The problem with the function

Furthermore, it is also described in Patent Document 1 that by making the content of a low-molecular-weight aromatic polycarbonate polymer having a molecular weight of less than 1,000 2% by mass or less, die blocking or deterioration of the appearance can be suppressed, but unlike optical discs such as CDs and DVDs, There are various molding conditions and methods for molding and light guide plate molding, and there is a problem that mold sticking cannot be prevented only by focusing on components with a molecular weight of 1000 or less.

[0005] In addition, the resin composition of the above-mentioned Patent Document 2 also has the problem of insufficient suppression of gas generation and die sticking under high-temperature molding conditions of 340°C or higher.

[0006] In addition, when the molded product has silver streaks, it cannot be shipped as a product. In addition, when mold sticking occurs, traces attached to the molded product will remain, not only cannot be shipped as a product, but also there is a need to stop the molding machine for cleaning. question

In particular, since the light guide plate mold has fine prisms or lenses, if the number of cleanings is increased, there is a risk of damage to the fine structure, so it should be avoided.

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