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CN-121975292-A - Aromatic polycarbonate resin composition and light-diffusing molded article

CN121975292ACN 121975292 ACN121975292 ACN 121975292ACN-121975292-A

Abstract

The present invention relates to an aromatic polycarbonate resin composition and a light diffusing molded article. The present invention provides an aromatic polycarbonate resin composition which has excellent heat stability, high transparency, light transmittance, high light diffusion, and less possibility of causing a decrease in transparency and light transmittance without impairing the characteristics of heat resistance, mechanical strength, etc. inherent in a polycarbonate resin. The aromatic polycarbonate resin composition of the present invention comprises a linear aromatic polycarbonate resin (A), a polyether derivative (B), a light diffusing agent (C), a phosphorus antioxidant (D) and an aromatic compound (E) represented by the following formula (1), and comprises 0.1 to 2.0 parts by weight of the polyether derivative (B), 0.1 to 6.0 parts by weight of the light diffusing agent (C), at most 0.5 parts by weight of the phosphorus antioxidant (D) and at most 0.003 parts by weight of the aromatic compound (E) per 100 parts by weight of the linear aromatic polycarbonate resin (A).

Inventors

  • Hanao Atsushi

Assignees

  • 住化PC有限公司

Dates

Publication Date
20260505
Application Date
20230711
Priority Date
20220713

Claims (7)

  1. 1. An aromatic polycarbonate resin composition comprising a linear aromatic polycarbonate resin (A), a polyether derivative (B), a light diffusing agent (C), a phosphorus antioxidant (D) and an aromatic compound (E) represented by the following formula (1), The aromatic polycarbonate resin composition contains 0.1 to 2.0 parts by weight of a polyether derivative (B), 0.1 to 6.0 parts by weight of a light diffusing agent (C), at most 0.5 parts by weight of a phosphorus antioxidant (D), at most 0.003 parts by weight of an aromatic compound (E) per 100 parts by weight of the linear aromatic polycarbonate resin (A), The light diffusing agent (C) is at least 1 selected from silicone light diffusing agents, acrylic light diffusing agents and inorganic particles, Formula (1): 。
  2. 2. the aromatic polycarbonate resin composition according to claim 1, wherein, The polyether derivative (B) comprises a polyether derivative represented by the following formula (2) and having a weight average molecular weight of 500 to 8000: formula (2): RO-(X-O)m(Y-O)n-R’ Wherein R and R' each independently represent a hydrogen atom or an alkyl group having 1 to 30 carbon atoms, X represents a linear alkylene group or a branched alkylene group having 2 to 4 carbon atoms, Y represents a linear alkylene group or a branched alkylene group having 2 to 5 carbon atoms, X and Y are optionally the same or different, m and n each independently represent 3 to 60, and m+n represents 6 to 120.
  3. 3. The aromatic polycarbonate resin composition according to claim 1, further comprising at least 1 selected from the group consisting of a heat stabilizer, a colorant, a mold release agent, a softener, an antistatic agent and an impact modifier.
  4. 4. The aromatic polycarbonate resin composition according to claim 1, wherein, The aromatic polycarbonate resin composition has a total light transmittance value of 40% or more and a light diffusivity (D50) of 30 degrees or more in a molded article having a width of 50mm by a length of 25mm by a thickness of 1 mm.
  5. 5. The aromatic polycarbonate resin composition according to claim 1, wherein, The molded article of the aromatic polycarbonate resin composition has a yellowness YI value of 5.0 or less after being maintained at 90 ℃ for 500 hours.
  6. 6. A light diffusing molded article comprising the aromatic polycarbonate resin composition according to any one of claims 1 to 5.
  7. 7. The light diffusing molded article according to claim 6, wherein, The light diffusing molded article is a light diffusing plate or a light diffusing film for an image display device.

Description

Aromatic polycarbonate resin composition and light-diffusing molded article The present application is a divisional application, the international application number of which is PCT/JP2023/025622, the Chinese national application number is 202380032124.5, the application date is 2023, 7 and 11, and the application is named as "aromatic polycarbonate resin composition and light-diffusing molded article". Technical Field The present invention relates to an aromatic polycarbonate resin composition and a light diffusing molded article. Background Polycarbonate resins have been used in the past for molded articles such as light guide plates, various lenses, and signboards because they are excellent in impact resistance, heat resistance, transparency, and the like. Light-diffusing molded articles made of a resin composition obtained by blending a light-diffusing agent such as inorganic fine particles or polymer fine particles with an aromatic polycarbonate resin are excellent in heat resistance and dimensional stability as compared with light-diffusing molded articles made of an acrylic resin, and therefore are used in a wide range of fields such as a globe, a meter, a signboard (particularly, an interior light), a resin window glass, a light diffusion plate for an image reading device or an image display device (for example, a light diffusion plate used in a backlight module of a liquid crystal display device, a light diffusion plate used in a projection type display screen of a projection television, etc.), a light diffusion film (for example, a highly transmissive light diffusion film used for improving the brightness of a liquid crystal display device, etc.). With recent increases in size, thickness (weight reduction), shape complexity, and high performance of image display devices, there is a demand for an aromatic polycarbonate resin composition having excellent fluidity during molding processing, which is also increasing in size, thickness (weight reduction), shape complexity, and high performance of light diffusing molded articles, particularly light diffusing plates and light diffusing films used in image display devices. Patent document 1 describes that fluidity is improved by adding a pentaerythritol-based ester compound and reducing the molecular weight of an aromatic polycarbonate-based resin by transesterification. Prior art literature Patent literature Patent document 1 International publication No. 2013/01977 Disclosure of Invention Problems to be solved by the invention However, the polycarbonate resin composition disclosed in patent document 1 does not sufficiently satisfy the requirements made of materials in recent years, and for example, transparency and light transmittance are reduced little in the case of molding processing at a high temperature for thin molding, and an increase in size can be achieved. In recent years, a light diffusing molded article (for example, a light diffusion plate for an image display device) used in a thin-type image display device having a size of about 0.3mm subjected to molding has been demanded to have little decrease in transparency and light transmittance even when exposed to high temperature conditions such as light irradiation for an extremely long period of time, that is, a material having high light diffusion properties that does not decrease light transmittance even when the size is large and does not see through to a light source has been demanded. An object of the present invention is to provide an aromatic polycarbonate resin composition which is excellent in heat stability, transparency, light transmittance and light diffusibility without impairing the characteristics of heat resistance, mechanical strength and the like inherent in a polycarbonate resin, and which is hardly reduced in transparency and light transmittance (hardly causing cloudiness or coloration) even when a molded article having a thin and large body size of about 0.3mm (for example, a light diffusion plate for an image display device) is subjected to molding processing is exposed to high temperature conditions such as light irradiation for an extremely long period of time, that is, is not reduced in light transmittance even when the molded article has a large body size, and is not seen through to a light source even if the molded article has a large body size, and is high in light diffusibility. Means for solving the problems The present inventors have made intensive studies to solve the above problems, and as a result, have found that an aromatic polycarbonate resin composition comprising a predetermined amount of a linear aromatic polycarbonate resin, a polyether derivative (B) and a light diffusing agent (C) does not deteriorate the properties of the polycarbonate resin such as heat resistance and mechanical strength inherent in the polycarbonate resin, is excellent in heat stability and high in light transmittance, and that a molded article (light guide plate) of a thin shape o