Optically clear polycarbonate polyester compositions

一种聚碳酸酯、光学透明的技术，应用在热塑性树脂组合物领域，能够解决透明性降低、高扭矩、流动性低等问题

Active Publication Date: 2008-02-13
SHPP GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above compositions, low-temperature ductility is sacrificed for better flow and impact resistance, and the use of impact modifiers results in reduced transparency
Polymers of polycarbonate and siloxane, while useful, flow less than desired, requiring high torque or high molding pressure during processing

Method used

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  • Optically clear polycarbonate polyester compositions
  • Optically clear polycarbonate polyester compositions
  • Optically clear polycarbonate polyester compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0081] In one embodiment, the organopolysiloxane-polycarbonate block copolymer has structure XVIII:

[0082]

[0083] R 19 and R 20 The groups shown include aryl and haloaryl such as phenyl, chlorophenyl, xylyl, tolyl, etc.; aralkyl such as phenethyl, benzyl, etc.; aliphatic, haloaliphatic, and cyclic Aliphatic groups such as alkyl, cycloalkyl, haloalkyl, including methyl, ethyl, propyl, chlorobutyl, cyclohexyl, etc.; R 19 and R 20 can be the same group or any two or more of the aforementioned groups, while R 19 and R 20 Preferably methyl, R 17 Include the above R 19 and R 20 All groups included, except hydrogen, where R 17 It can also be the same group or any two or more of the aforementioned R 19 and R 20 groups, except hydrogen, and R 17 Methyl is preferred. except R 19 and R 20 All groups (except hydrogen) included, R 17 Also included are cyanoalkyl groups such as cyanoethyl, cyanobutyl, and the like. E. 1 The groups included in the definition are hydro...

Embodiment 1-5

[0112] Examples 1-5: In these examples, polycarbonate obtained from the General Electric Company as Lexan(R) polycarbonate resin was blended with PCCD obtained from Eastman Chemicals and various levels of silicon obtained from the General Electric Company were used. Oxyalkylene-modified polycarbonate and ABS 415 were used as impact modifiers. The thermoplastic resin composition was compounded on a WP25mm co-rotating twin-screw extruder at 270°C to obtain a granular composition. The mixing was carried out at a feed rate of about 15 kg / h and a screw speed of about 300 revolutions / minute. The pellets obtained were dried at 100°C for at least 4 hours before injection molding into ASTM / ISO test specimens on an 80 ton, 4 oz injection molding machine operating at about 280°C. The silicone-modified polycarbonate used here has a silicone content of 6% and ABS 415 has a rubber (butadiene) content of 50%. The ingredient amounts were chosen to maintain the same soft phase (silicone + ru...

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Abstract

An optically clear thermoplastic resin composition consisting essentially of: structural units derived at least one substituted or unsubstituted polycarbonate, at least greater than 30 weight percent of a substituted or unsubstituted polyester, a modified polycarbonate, an impact modifier having a refractive index in the range between about 1.51 and about 1.56 and an additive is disclosed. The composition possess good optical properties, flow, stability and mechanical property. Also disclosed is a process to prepare these compositions and articles therefrom.

Description

Background of the invention [0001] The present invention relates to optically clear thermoplastic resin compositions, methods of synthesizing the compositions and articles made from the compositions. [0002] Polycarbonates are useful engineering plastics for parts requiring transparency, high toughness, and sometimes good heat resistance. However, polycarbonate also suffers from some important drawbacks, such as poor chemical and stress crack resistance, poor gamma radiation sterilization resistance, and poor processability. Blends of polyesters and polycarbonates provide thermoplastic compositions with improved properties relative to those compositions based only on a single resin. In addition, the blends are also often more cost effective relative to a single polycarbonate. The miscibility of PC with polyesters imparts the desired transparency to blends, but this is limited to (semi)aliphatic polyesters such as poly(cyclohexanedimethanol cyclohexanedicarboxylate) (PCCD )...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L69/00C08L83/10C08L67/02
CPCC08L51/04C08L69/00C08G77/448C08L67/02C08L55/02C08L2666/02C08L2201/10
Inventor 维什瓦吉特·C·朱卡甘尼什·卡南伯纳德斯·A·G·施劳文加布里·J·M·胡格兰德
Owner SHPP GLOBAL TECH BV
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