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Flame retardant, thermoplastic polycarbonate molding compositions

A composition and flame retardant technology, applied in the field of flame retardant polycarbonate composition, can solve problems such as unfavorable polycarbonate properties

Inactive Publication Date: 2010-04-28
BAYER MATERIALSCIENCE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the presence of large amounts of halogens has been found to be detrimental to the performance of polycarbonates and a number of additives such as those disclosed in U.S. Patents 3,647,747 and 3,733,295 have been proposed to overcome these adverse effects

Method used

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  • Flame retardant, thermoplastic polycarbonate molding compositions
  • Flame retardant, thermoplastic polycarbonate molding compositions
  • Flame retardant, thermoplastic polycarbonate molding compositions

Examples

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preparation example Construction

[0039] A preferred method of preparing polycarbonates is interfacial polycondensation.

[0040] Other synthetic methods may also be used to form the polycarbonates of the present invention, such as those described in US Patent No. 3,912,688, which is hereby incorporated by reference.

[0041] Suitable polycarbonate resins are commercially available, for example, Makrolon FCR, Makrolon 2600, Makrolon 2800 and Makrolon 3100, all of which are bisphenol-based homopolycarbonate resins of various molecular weights, characterized by The melt flow index (MFR) according to ASTM D-1238 is about 16.5-24 g / 10 min, 13-16 g / 10 min, 7.5-13.0 g / 10 min, and 3.5-6.5 g / 10 min, respectively. They are products of Bayer Corporation of Pittsburgh, Pennsylvania.

[0042] Polycarbonate resins suitable for use in the practice of this invention are known and their structures and methods of preparation are disclosed in the following patents: The literature is hereby incorporated by reference. The pref...

Embodiment

[0050] Compositions according to the invention were prepared and their properties evaluated. The composition of the exemplary compositions and their properties are shown in the table below.

[0051] In preparing the composition, the following components are used:

[0052] Polycarbonate (hereinafter referred to as PC): Makrolon 2608, a bisphenol A-based homopolycarbonate, product of Bayer polymers, with a melt flow rate of 10 measured at 300°C / 1.2 kg load according to ASTM D1238 g / 10 min.

[0053] PTFE was added to the composition as a powdered PTFE / SAN mixture, Blendex 449, a product of GE Specialty Chemicals, containing approximately 50% by weight styrene-acrylonitrile (SAN) and 50% by weight PTFE.

[0054] Sulfo-modified polyester (hereinafter SMP): commercially available from Eastman under the designation AQ 38S.

[0055] The compositions are prepared by conventional equipment and synthetic routes well known to those skilled in the art.

[0056] Table 1

[0057] ...

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Abstract

A flame-retardant thermoplastic molding composition is disclosed. The composition contains aromatic polycarbonate resin and sufficient amounts of poly(tetrafluoroethylene) and sulfo-modified polyester, that are effective to impart to the composition flame resistance that in accordance with UL-94 standard is rated V-0 at 1 / 16' thick specimens.

Description

field of invention [0001] This invention relates to thermoplastic molding compositions, and more particularly to flame retardant polycarbonate compositions. Summary of the invention [0002] The present invention discloses a flame-retardant thermoplastic molding composition. The composition contains an aromatic polycarbonate resin and poly(tetrafluoroethylene) and a sulfo-modified polyester in an amount sufficient to Effectively the flame retardancy of the composition is V-0 for 1 / 16" thick samples according to the UL-94 standard. Background of the invention [0003] Aromatic polycarbonates have been widely known since US Patent No. 3,028,365 issued in April 1962, and have been recognized as suitable thermoplastic resins for many applications, including injection molding, extrusion, and film formation. Schnell, Interscience (1964) in "Chemistry and Physics of Polycarbonates" and Christopher and Fox, Reinhold (1962) in "Polycarbonates (Polycarbonates)" discusses the prope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L69/00
CPCC08L69/00C08L25/04C08L27/18C08L67/02C08L2666/02
Inventor J·Y·J·钟W·G·保罗
Owner BAYER MATERIALSCIENCE AG