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Optical quality polycarbonates with reduced static charge and method for making same

A diaryl carbonate, high-quality technology, applied in the field of preparation of such materials, can solve problems such as easy seepage, weakening of polycarbonate product performance, side reactions, etc.

Inactive Publication Date: 2002-04-17
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Like all additives that are not an integral part of the polymer structure, they are prone to bleed and may also undergo side reactions or otherwise impair the performance of the polycarbonate product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] To prepare various resins with varying degrees of endcapping, 2200 g of molten resin with a degree of endcapping of 79.9% dissolved in 16 liters of methylene chloride was added to a 10 gallon glass reactor. Depending on the desired degree of endcapping, a typical preparation is as follows: phenyl chloroformate (13.55 g (0.087 moles), 1.0 mol%). The mixture was stirred at room temperature for 30 minutes, then washed successively with 1.0N hydrochloric acid (10 L), 0.3N hydrochloric acid (10 L) and DI water (4×10 L). The resin solution was precipitated in methanol (30 liters) in a 30 gallon henschel mixer. The powder was dried under vacuum at 120°C for 12 hours. The resulting powder was extruded with 30 mm TSE at a rate of 15 lbs / hr at a barrel set temperature of 260°C. The material was molded on a Nessie 160 molding machine to produce 3.5 inch dynatup panels.

[0021] Compositions were also prepared using a commercial antistatic agent (Atmer 154) and a mold release a...

Embodiment 2

[0027] Table 2

[0028] The examples shown in Tables 3 and 4 contain and do not contain Atmer 154 as an antistatic agent; however, we demonstrate that the use of high EC or combinations of high EC + Atmer can significantly improve the antistatic performance in optical disc applications.

[0029] CD-Electrostatic Performance

[0030] DVD-Static Performance

[0031] Based on these results, we can conclude that increasing the degree of endcapping with OQ melt polycarbonate significantly reduces the molded static charge of injection molded parts in compact disc applications. Highly end-capped LX material (>90%) results in reduced static and dust attraction, which are important CTQs for the CD industry. Additionally, high EC + Atmer combinations can provide additional improvements in static charge reduction when molding more demanding applications such as DVDs.

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PUM

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Abstract

Increasing the endcap level to a level greater than about 90% for Optical Quality (OQ) Melt Polycarbonate significantly reduces the as-molded static charge for injection molded parts for Optical Disc applications. The use of resins with higher endcap levels in combination with antistatic additives provides a highly robust formulation suitable for even the most demanding emerging formats as Digital Versatile Disc (DVD) and in all commercial Optical media molding machines. Thus, optical quality polycarbonates are prepared by performing a base-catalyzed polymerization of a diaryl carbonate and a dihydric phenol under conditions effective to produce a polycarbonate product having an endcap level of 90% or greater.

Description

[0001] Cross-Referenced Related Patents [0002] No statement about federally funded research [0003] none Background of the invention [0004] The present application relates to optical quality polycarbonates with reduced electrostatic charge and to methods for the preparation of such materials. [0005] Polycarbonate has become the material of choice for the manufacture of optical information storage media such as turntables, digitized video discs, laser discs, optical disc memories and magneto-optical discs, on which information can be written and read from by laser light. For use in these applications, polycarbonates are preferably made using melt processes such as those disclosed in US Patent No. 5,606,008, which is incorporated herein by reference. This method not only avoids the use of highly toxic phosgene, which is necessary for the manufacture of polycarbonate by the older interfacial (IF) method, but also produces products with excellent optical properties. Howe...

Claims

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Application Information

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IPC IPC(8): C08L69/00C08G64/14C08G64/30G11B7/253G11B11/105
CPCC08G64/307C08G64/14G11B7/2534C08G64/30
Inventor K·伊诺H·伊施达T·施莫达T·L·赫克斯H·H·M·范霍特M·M·马鲁甘D·M·达达里斯P·J·麦克洛斯基
Owner SABIC GLOBAL TECH BV
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