POLYCARBONATE RESIN COMPOSITION AND OPTICAL MOLDED PRODUCT INCLUDING THE SAME

Abstract

Provided are a polycarbonate resin composition comprising a polycarbonate resin, pentaerythritol tetrastearate, a black dye, and a blue dye, and an optical molded product comprising same.

Claims

1. A polycarbonate resin composition, comprising a polycarbonate resin having a melt flow rate (MFR) of 5 to 15 g/10 min according to ASTM D1238, pentaerythritol tetrastearate, a black dye, and a blue dye, wherein: transmittance at 410 nm according to ASTM D1003 is 7% or less, and wherein a change in yellowness index (YI) expressed by the following
YI=YI (340 C.)YI (285 C.) [General Equation 1] wherein YI is the yellowness index value measured according to ASTM D1925 at the corresponding temperature.

2. The polycarbonate resin composition according to claim 1, wherein the polycarbonate resin includes a repeating unit of the following Chemical Formula 1: ##STR00003## wherein in Chemical Formula 1, a is an integer of 1 or more.

3. The polycarbonate resin composition according to claim 1, wherein the polycarbonate resin has a weight average molecular weight of 10,000 g/mol to 50,000 g/mol.

4. The polycarbonate resin composition according to claim 1, wherein the black dye is C.I. Pigment Black 32.

5. The polycarbonate resin composition according to claim 1, wherein the blue dye is a compound of the following Chemical Formula 2: ##STR00004##

6. The polycarbonate resin composition according to claim 1, wherein the pentaerythritol tetrastearate is present in an amount from 0.05 to 5 parts by weight, the black dye is present in an amount from 1.010.sup.4 to 1.010.sup.1 parts by weight, and the blue dye is contained present in an amount of amount from 1.010.sup.4 to 1.010.sup.1 parts by weight, based on 100 parts by weight of the polycarbonate resin.

7. The polycarbonate resin composition according to claim 1, wherein the polycarbonate resin composition further comprises at least one additive selected from the group consisting of an antioxidant, a heat stabilizer, a plasticizer, an antistatic agent, a nucleating agent, a flame retardant, a lubricant, an impact-reinforcing agent, an ultraviolet absorber, and a fluorescent brightener.

8. An optical molded product comprising the polycarbonate resin composition according to claim 1.

9. The optical molded product according to claim 8, wherein the optical molded product is a lens.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0092] Hereinafter, preferred examples are presented to facilitate understanding of the present invention.

[0093] However, the following examples are given for illustrative purposes only, and the scope of the present invention is not intended to be limited to or by these examples.

EXAMPLES AND COMPARATIVE EXAMPLES

Preparation of Polycarbonate Resin Composition

Examples 1 and 2, Comparative Examples 1 to 8

[0094] A polycarbonate resin composition was prepared by mixing the respective additive components in the amounts shown in Table 1 based on 100 parts by weight of the polycarbonate resin composition.

TABLE-US-00001 TABLE 1 Classification (component/content) PC resin Additive Dye Parts by weight A B C D E F G Example 1 a-1/ b-1/ c-1/0.12 d-1/ e-1/ f-1/0.00014 99.404957 0.075 c-2/0.12 0.05 0.35 f-2/0.0002 Example 2 a-1/ b-1/ c-1/0.12 d-1/ e-1/ f-1/0.00017 99.404957 0.075 0.05 0.35 f-2/0.0002 Comparative a-1/ b-1/ c-1/0.12 d-1/ e-1/ g-1/0.00014 Example 1 99.404957 0.075 0.05 0.35 g-2/0.0002 Comparative a-1/ b-1/ c-1/0.12 d-1/ e-1/ g-2/0.0002 Example 2 99.404957 0.075 0.05 0.35 Comparative a-1/ b-1/ c-1/0.12 d-1/ e-1/ g-3/0.0002 Example 3 99.404957 0.075 0.05 0.35 Comparative a-1/ b-1/ c-1/0.12 d-1/ e-1/ g-1/0.00014 Example 4 99.404957 0.075 0.05 0.35 g-3/0.0002 Comparative a-1/ b-1/ c-1/0.12 d-1/ e-2/ f-1/0.00014 Example 5 99.404957 0.075 0.05 0.35 f-2/0.0002 Comparative a-1/ b-1/ c-1/0.12 d-1/ e-3/ f-1/0.00017 Example 6 99.404957 0.075 0.05 0.35 f-2/0.0002 A (PC resin): a-1: Bisphenol A type of linear polycarbonate of Mw 32,000 and MFR (300 C., 1.2 kg) of 8 g/10 min (LG Chem) B (antioxidant): b-1 PEP36 (ADEKA) C (light absorber): c-1: UV3638 (Solvay), c-2: B-Cap (Clariant) D (chain extender): d-1: ADR4370F (4468) (BASF) E (additive): e-1: Pentaerythritol tetrastearate/e-2: GMS(glycerol mono stearate)/e-3: GTS (glycerol tri stearate) F (dye): f-1 (Blue, Reddish Blue): Blue G/f-2(black) (Lanxess): BK32 (BASF) G (dye): g-1 (Blue): BL12 (CAS No. 61969-44-6) (Lanxess), g-2 (red): RP04 (CAS No. 6829-22-7) (Lanxess), g-3 (Greenish Blue): Violet 3R (Lanxess)

Experimental Example

[0095] Pellet samples were prepared by melt-kneading the resin compositions prepared in the examples and comparative examples at a rate of 55 kg per hour in a twin screw extruder (L/D=36, =45, barrel temperature 240 C.), and the properties of the prepared samples were measured by the following methods.

[0096] (1) Melt Flow Rate (MFR, g/min)

[0097] The melt flow rate was measured at 300 C. under a load of 1.2 kg using a Melt Indexer G-02 (manufactured by Toyoseiki) in accordance with ASTM D1238, and the results are shown in Table 2 below.

[0098] (2) Transmittance (%)

[0099] The transmittance at 410 nm was measured under the transmission condition of 350 to 1050 nm using a HunterLab instrument in accordance with ASTM D1003, and the results are shown in Table 2 below.

[0100] (3) Change in Yellowness Index (YI)

[0101] The yellowness index was measured under the transmission condition of 350 to 1050 nm using HunterLab equipment in accordance with ASTM D1925.

[0102] The yellowness index was measured at 285 C. and 340 C. while heating from 285 C. to 340 C. for 20 minutes, and change in yellowness index was calculated according to the following General Equation 1. The results are shown in Table 2 below.

YI=YI (340 C.)YI (285 C.) [General Equation 1]

TABLE-US-00002 TABLE 2 Transmittance at Classification 410 nm (%) YI Example 1 4.4 0.23 Example 2 4.6 0.25 Comparative 8.7 0.25 Example 1 Comparative 7.8 0.26 Example 2 Comparative 8.4 0.25 Example 3 Comparative 7.2 0.26 Example 4 Comparative 4.5 2.46 Example 5 Comparative 5.2 2.67 Example 6

[0103] As shown in Table 2, it was confirmed that in the case of the examples according to the present invention, heat resistance and excellent optical properties can be simultaneously realized by introducing a specific additive and two kinds of dyes.

[0104] It was also confirmed that in the case of the comparative examples deviating from the combination of components limited by the present invention, the heat resistance is decreased under high temperature conditions and change in yellowness index is remarkably increased or the transmittance at 410 nm is increased, which is unsuitable for optical molded products, particularly lenses.