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Alicyclic polycarbonate composition

A polycarbonate and cycloaliphatic technology, applied in the field of light guide plate manufacturing, can solve problems such as yellowing, decrease in transmittance, and decrease in molecular weight, and achieve the effects of high molecular weight, low yellowing, and high light transmittance

Pending Publication Date: 2022-07-26
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Cycloaliphatic polycarbonate will undergo significant degradation when processed and molded in the high-temperature environment used to manufacture light guide plates, resulting in a decrease in molecular weight, yellowing, and a decrease in transmittance
Although the use of conventional heat stabilizer systems can inhibit thermal degradation to a certain extent, it often causes hydrolytic degradation of cycloaliphatic polycarbonate in hot and humid environments. For this reason, we propose a composition of cycloaliphatic polycarbonate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0096] The present invention will be described below by way of examples, but the present invention is not limited to these examples.

[0097] [Evaluation method]

[0098] (1) Number average molecular weight and weight average molecular weight

[0099] Number average molecular weight (M n ) and weight average molecular weight (M w ) was determined using a Shimadzu LC-20AD high performance liquid chromatography system (equipped with a refractive index detector [Shimadzu RID-10A] and a Shodex GPC column [K-804L; ID=8mm, length=300mm]). Chloroform was used as the mobile phase, the test temperature was 40 °C, and the flow rate was 1 ml / min. A calibration curve was established using monodisperse polystyrene as the standard prior to testing.

[0100] (2) Yellow index test

[0101] Take 1 gram of cycloaliphatic polycarbonate composition and dissolve it in 10 ml of chloroform. The solution was measured using a UV / Vis spectrophotometer (UV1900, Youke Instrument), and the yellownes...

manufacture example 1

[0116] [Production Example 1 of Alicyclic Polycarbonate (A)] = PC-A2

[0117] The polymerization of the alicyclic polycarbonate resin (A) was carried out using a vertical stirring reactor. Transesterification stage: put ISB (500g, 3.421mol), CHDM (211g, 1.463mol), DPC (1051.7g, 4.909mol) and catalyst (3ppm calcium chloride) into the reactor; under nitrogen atmosphere, set 120 ℃ melt the raw material and mix it with the catalyst uniformly; after melting, turn on stirring and set to 180 ℃, and react at normal pressure for 40 minutes; pre-polycondensation stage: keep 180 ℃, reduce the vacuum degree to 25kPa, and keep it for 50 minutes; raise the temperature to 200 ℃, while The vacuum degree was gradually reduced to 12kPa for 60 minutes; the polycondensation stage: the temperature was set to 220°C, and the vacuum degree was gradually reduced to 1kPa for 60 minutes; the temperature was set to 240°C, and the vacuum degree was reduced to 70Pa. Fine-tune the vacuum degree of the last...

manufacture example 2

[0118] [Production Example 2 of Alicyclic Polycarbonate (A)]=PC-A3

[0119] The catalyst in Production Example 1 was changed to 3 ppm of zinc acetate. Except for this, an alicyclic polycarbonate (A) resin was produced in the same manner as in the above-mentioned Production Example 1, which was referred to as PC-A3, and the weight average molecular weight was 23.5 kg / mol.

[0120]

[0121] Butyl p-toluenesulfonate, Aladdin's reagent

[0122]

[0123] (C1) "Irgastab HP-136": 5,7-bis-(2,2-dimethylethyl)-3-(3,4-dimethylphenyl)-2-3hydro-benzofuran Ketone, manufactured by BASF Corporation

[0124] (C2) "ADK STAB PEP-36": Bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphate, manufactured by ADEKA Corporation

[0125] (C3) "Irganox 1010": Pentaerythritol-tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], manufactured by BASF Corporation

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Abstract

The present invention discloses an alicyclic polycarbonate composition, which comprises an alicyclic polycarbonate (A) as a structural unit, the content of a dihydroxy compound structural unit shown in the alicyclic polycarbonate (A) is 30 mol% or more, and the weight-average molecular weight is 10-50 kg / mol. The alicyclic polycarbonate composition disclosed by the invention can keep higher molecular weight, lower yellowing and higher optical transparency at high temperature, can also keep enough molecular weight after being treated in a humid and hot environment for a long time, and can be used for manufacturing a high-quality light guide plate material.

Description

technical field [0001] The invention relates to the technical field of manufacture of light guide plates, in particular to an alicyclic polycarbonate composition. Background technique [0002] Bisphenol A polycarbonate (BPA-PC) material has excellent transparency, heat resistance and mechanical properties, and can be used in fields such as light guide plates, lenses and optical fibers. However, its optical transparency is still lower than that of polymethyl methacrylate (PMMA), resulting in lower brightness of BPA-PC molding materials. Isosorbide-based polycarbonate (IcC-PC) is not only close to PMMA in optical transparency, but also comparable to BPA-PC in mechanical properties. Therefore, IcC-PC has broader application prospects in the field of optical materials. [0003] However, the heat resistance of IcC-PC is low, and thermal degradation may occur in the high temperature environment of manufacturing the light guide plate, showing molecular weight drop, yellowing and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L69/00C08K5/1535C08K5/134C08K5/521C08G64/30G02B1/04G02B6/00
CPCC08K5/1535C08K5/1345C08K5/521C08G64/305G02B1/045G02B6/00C08L69/00
Inventor 吴国章严圣迪王新宇徐佳鸿
Owner EAST CHINA UNIV OF SCI & TECH