Polycarbonate and optical member including same

A polycarbonate and optical component technology, applied in optical components, optical components, optics, etc., can solve the problems of low fluidity and poor formability of copolycarbonate

Active Publication Date: 2016-10-12
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this copolycarbonate also has disadvantages such as low fluidity and poor formability.

Method used

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  • Polycarbonate and optical member including same
  • Polycarbonate and optical member including same
  • Polycarbonate and optical member including same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0109] Hereinafter, the present invention will be further described with reference to examples.

[0110] 1. A sample for evaluation was prepared by the following method.

[0111] (a) Cast film:

[0112] 5 g of the obtained polycarbonate was dissolved in 50 ml of methylene chloride, and cast on a glass dish. After sufficiently drying at room temperature, the polycarbonate was dried at a temperature of 20° C. or lower for 8 hours to produce a cast film.

[0113] (b) spherical lens:

[0114] After the obtained polycarbonate was vacuum-dried at 120°C for 8 hours, the molding temperature was set to Tg+110°C, the mold temperature was set to Tg-10°C, and the injection molding machine with a thickness of 0.2 mm, convex curvature radius 5mm, concave curvature radius 4mm, Φ5mm lens.

[0115] (c) Formed sheet

[0116] Molded sheets having a width of 2.5 cm, a length of 5 cm, and a thickness of 1, 2, and 3 mm were injection-molded in the same manner as in (b) above.

[0117] 2. Eval...

reference example 1

[0144] 374.44 parts by weight of 1,1-bi(2-(2-hydroxyethoxy)naphthalene (hereinafter sometimes abbreviated as "BL-2EO"), 222.79 parts by weight of diphenyl carbonate (DPC), and tetramethyl hydroxide Ammonium 1.82×10 -2 Put the parts by weight into a reaction kettle with a stirrer and a distillation device, heat to 180° C. under a nitrogen atmosphere and normal pressure, and stir for 20 minutes. Then, the degree of reduced pressure was adjusted to 20 to 30 kPa over 20 minutes, and the temperature was raised to 260° C. at a rate of 60° C. / hr to perform transesterification. Then, the pressure was reduced to 0.13 kPa or less over 120 minutes while maintaining the temperature at 260° C., and a polymerization reaction was performed under stirring for 1 hour at 260° C. and 0.13 kPa or less.

Embodiment 1

[0146] BL-2EO was 355.72 parts by weight, 10,10-bis(4-hydroxyphenyl)anthrone (hereinafter sometimes abbreviated as "BP-ANT") was 18.92 parts by weight, DPC was 222.79 g, Polymerization was carried out in the same manner as in Reference Example 1 except that the reaction time under conditions of 260° C. and 0.13 kPa or less was 0.5 hour.

[0147] The polycarbonate has a molar ratio of BL-2EO and BP-ANT of 95:5, a specific viscosity of 0.260, and a Tg of 123°C.

[0148] After vacuum-drying the polycarbonate produced at 123° C. for 4 hours, add 0.050% of bis(2,4-dicumylphenyl) pentaerythritol diphosphite based on the weight of the obtained polycarbonate composition , 0.10% of pentaerythritol tetrastearate was pelletized using a φ30 mm single-screw extruder with a vent. The heat and humidity resistance was good, and the specific viscosity retention rate after the heat and humidity test was 95%.

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Abstract

The present invention relates to: a polycarbonate having high transparency, a high refractive index, low birefringence, moldability, and moist-heat resistance; and an optical member including the polycarbonate. Disclosed is a polycarbonate comprising 98 to 2 mol% of a unit represented by formula (I) and 2 to 98 mol% of a unit represented by formula (II), wherein, when 0.7 g of the polycarbonate is dissolved in 100 ml of methylene chloride, the specific viscosity is from 0.12 to 0.40 when measured at 20 DEG C. In the formula, R1 to R8 each independently represent a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a C1-6 alkyl group, a C6-12 aryl group, a C2-6 alkenyl group, a C1-6 alkoxy group, or a C7-17 aralkyl group. In the formula, R9 to R12 each independently represent a hydrogen atom, a C1-9 hydrocarbon group that may include an aromatic group, or a halogen atom. X is an alkylene group, and n is an integer of 0 to 3.

Description

technical field [0001] The present invention relates to a polycarbonate having high transparency, high refractive index, low birefringence, moldability, and heat-and-moisture resistance, and an optical component containing the polycarbonate. Background technique [0002] In recent years, studies have been conducted on the use of bisphenol-based polyester resins, polycarbonate resins, and polyester carbonate resins as materials with heat resistance, transparency, impact resistance, and high refractive index for use in automobiles. Optical components such as lighting lenses, camera lenses, and optical discs. In addition, in order to reflect the thinner and shorter optical components, optical characteristics with high refractive index and low photoelastic constant were studied. [0003] For example, Patent Document 1 proposes a polyester having a binaphthol skeleton and having a high refractive index. However, polyester has a disadvantage of low heat-and-moisture resistance. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/04
CPCC08G64/06C08G64/30G02C7/02C08G64/307G02B1/041
Inventor 重松辉幸松井学
Owner TEIJIN LTD
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