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KR-20260063281-A - POLYCARBONATE RESIN COMPOSITION

KR20260063281AKR 20260063281 AKR20260063281 AKR 20260063281AKR-20260063281-A

Abstract

The present invention relates to a polycarbonate resin composition having excellent transmittance while also having improved mold release and color stability, and an article comprising the same.

Inventors

  • 고운
  • 반형민
  • 정재언
  • 유예지

Assignees

  • 주식회사 엘지화학

Dates

Publication Date
20260507
Application Date
20241030

Claims (10)

  1. Polycarbonate resin; and One or more mold release modifiers selected from the group consisting of tris(2-ethylhexyl) trimellitate (TOTM), tetraoctyl pyromellitate phthalate (TOPM), and triisononyl trimellitate (TINTM); comprising, The above-mentioned mold release improver is included in an amount of 0.15 to 0.55 parts by weight per 100 parts by weight of polycarbonate resin, Polycarbonate resin composition.
  2. In paragraph 1, The above-mentioned mold release improver is included in an amount of 0.2 to 0.5 parts by weight per 100 parts by weight of polycarbonate resin, Polycarbonate resin composition.
  3. In paragraph 1, The above polycarbonate resin composition further comprises an antioxidant, Polycarbonate resin composition.
  4. In paragraph 3, The above antioxidant is included in an amount of 0.005 to 5.0 parts by weight per 100 parts by weight of the polycarbonate resin, Polycarbonate resin composition.
  5. In paragraph 3, The above antioxidant comprises a phosphite-based antioxidant and a hindered phenol-based antioxidant, Polycarbonate resin composition.
  6. In paragraph 1, The weight-average molecular weight of the above polycarbonate resin is 14,000 g/mol to 50,000 g/mol, Polycarbonate resin composition.
  7. In paragraph 1, When prepared as specimens with width, length, and thickness of 30 mm, 50 mm, and 3 mm, the transmittance measured at 420 nm exceeds 91.35% under transmission conditions of 350 nm to 850 nm in accordance with ASTM D1003, Polycarbonate resin composition.
  8. In paragraph 1, When injection molding is performed using a cup-shaped mold with an inner diameter of 60 mm and a height of 40 mm at an injection molding temperature of 265 ℃ and a mold temperature of 90 ℃, the release force, defined as the force required to eject the molded product from the mold, is 5.5 kN or less, Polycarbonate resin composition.
  9. In paragraph 1, Heat-soak color stability of 0.22 or less, defined as the difference between the yellow index measured under transmission conditions of 350 nm to 1,050 nm according to ASTM D1925 for specimens with width, length, and thickness of 30 mm, 50 mm, and 3 mm prepared after holding at an injection molding temperature of 300 ℃ for 15 minutes, and the initial yellow index measured under the same conditions for specimens prepared at an injection molding temperature of 260 ℃ without holding, Polycarbonate resin composition.
  10. An article comprising a composition according to any one of paragraphs 1 through 9.

Description

Polycarbonate Resin Composition The present invention relates to a polycarbonate resin composition having excellent transmittance while also having improved mold release and color stability, and an article comprising the same. Polycarbonate resin is known for its excellent impact resistance, transparency, strength, flame retardancy, electrical properties, and heat resistance. It is widely used in the manufacture of molded products for automobiles as well as electrical and electronic goods, and demand for it is increasing day by day. As the applications of these polycarbonate resins have recently expanded, demand is increasing in fields requiring high optical properties, such as light guide plates, automotive lamps, automotive DRLs, general lamps, and lenses. Furthermore, as the design of polycarbonate molded products becomes more complex and larger, the risk of damage during molding—such as sticking to the mold or detachment—increases. Therefore, in addition to mold release properties, it is becoming increasingly important for polycarbonate resins to maintain color stability at high temperatures to prevent discoloration even when remaining in the injection molding machine for extended periods. Accordingly, there is a need to develop a polycarbonate resin composition that has improved mold release and color stability while possessing optical properties equivalent to those of existing polycarbonate resins. Hereinafter, embodiments of the present invention will be described in more detail in the following examples. However, the following examples are merely illustrative of embodiments of the present invention, and the content of the present invention is not limited by the following examples. In the following examples and comparative examples, the following materials were used. (A): Polycarbonate resin LUPOY PC 1300-30 (Bisphenol A-based polycarbonate resin, manufacturer: LG Chemical, weight-average molecular weight (Mw): 21,100 g/mol (measured by GPC using PC Standard with Agilent 1200 series)) was used. (B): Mold change improver (B1) TOTM (Tris(2-ethylhexyl) trimellitate) (Manufacturer: LG Chemical, Cas No. 3319-31-1) (B2) TOPM (Tetraoctyl Pyromellitate Phthalate) (Manufacturer: LG Chemical, Cas No. 3126-80-5) (B3) PETS (Pentaerythritol Tetrastearate) (Manufacturer: FACI, Cas No. 115-83-3) (C): Antioxidant (C1) DP9228 (Manufacturer: Dover Chemical Corporation, Cas No. 154862-43-8) (C2) IRGANOX® 1010 (Manufacturer: BASF, Cas No. 6683-19-8) Example 1 A polycarbonate resin composition was prepared by adding 2,000 ppmw of TOTM (B1), 1,500 ppmw of DP9228 (C1), and 500 ppmw of IR1010 (C2) to 100 parts by weight of LUPOY PC 1300-30 (A), a polycarbonate resin, at a speed of 55 kg per hour in a twin-screw extruder (L/D=36, Φ=45, barrel temperature 260℃). Examples 2 to 8 and Comparative Examples 1 to 8 A polycarbonate composition was prepared in the same manner as in Example 1, except that the release agent TOTM (B1) used in Example 1 was changed as shown in Table 1 below. Usage (ppmw) 1)Transformation improverantioxidants(B1)(B2)(B3)(C1)(C2)Example 12,000--1,500500Example 23,000--1,500500Example 34,000--1,500500Example 45,000--1,500500Example 5-2,000-1,500500Example 6-3,000-1,500500Example 7-4,000-1,500500Example 8-5,000-1,500500Comparative Example 1---1,500500Comparative Example 21,000--1,500500Comparative Example 36,000--1,500500Comparative Example 47,000--1,500500Comparative Example 5-1,000-1,500500Comparative Example 6-6,000-1,500500Comparative Example 7-7,000-1,500500Comparative Example 8--2,0001,5005001) ppmw means the weight ratio to LUPOY PC 1300-30 (A), a polycarbonate resin. Experimental Example The physical properties of the polycarbonate compositions prepared in the above examples and comparative examples were evaluated as follows. (1) The power of change Each resin pellet prepared in the above examples and comparative examples was placed into an injection molding machine (Manufacturer: JSW Co., Ltd., Model: N-20C), and injection molding was performed using a cup-shaped mold with an inner diameter of 60 mm and a height of 40 mm. At this time, the injection molding temperature was set to 265 ℃ and the mold temperature to 90 ℃. Then, the ejecting force when the molded product was ejected at a low speed of 10 mm/s using an eject plate type was measured as the release force, and this value The lower the value, the better the mold characteristics can be evaluated. (2) 3T transmittance, 3T YI Each resin pellet prepared in the above examples and comparative examples was used to produce measurement specimens in the form of rectangular specimens (3T injection specimens) with a thickness of 3 mm and a planar scale of 30*50 mm using a JSW Co., Ltd. N-20C injection molding machine, at an injection molding temperature of 260℃. In accordance with ASTM D1003, the transmittance at 420 nm was measured using the Hunter lab’s UltraScan PRO with transmission conditions of 350 to 850 nm. Additionally, the yellowing index was m