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Transparent thermoplastic compositions having high flow and ductiliy, and articles prepared therefrom

A technology for thermoplastic compositions and products, which is applied in the field of thermoplastic compositions of poly-polycarbonate copolymers, can solve problems such as damage to polycarbonate impact strength mechanical properties (elongation at break, fatigue stress, etc.)

Active Publication Date: 2011-10-26
SHPP GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to obtain these desired fluidities, the impact strength and other mechanical properties of polycarbonate (elongation at break, fatigue stress, etc.)

Method used

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  • Transparent thermoplastic compositions having high flow and ductiliy, and articles prepared therefrom
  • Transparent thermoplastic compositions having high flow and ductiliy, and articles prepared therefrom
  • Transparent thermoplastic compositions having high flow and ductiliy, and articles prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and 2

[0155] Examples 1 and 2. Blends of PC-Si and PAE-PC copolymers were prepared as shown in Table 2, and their properties were measured. The PC-Si used had a siloxane content of 6 wt %, a weight average molecular weight of 23,000 g / mol, and an MVR of 10 cc / 10 min. The PAE-PC copolymer also had a similar molecular weight, and had a MVR of 38 cc / 10 min, and a soft block (ie, sebacate unit) content of 6 wt%. It can be seen that as the amount (wt%) of PAE-PC copolymer in the blend increases relative to PC-Si, the melt flow increases linearly from 10cc / 10min to 38cc / 10min, and the blend Keep optically clear.

[0156] Table 2 shows the data for the following examples: Example 1 with a blend ratio of PAE-PC to PC-Si of 20:80 w / w, and a blend ratio of PAE-PC to PC-Si of 40:60 w / w Example 2. Example 1 shows a MVR of 14.5 cc / 10 min and maintains 100% ductility down to -40°C. Example 2 shows a MVR of 21.3 cc / 10 min and also maintains 100% ductility down to -40°C.

[0157] Unexpectedly,...

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Abstract

Disclosed herein is a thermoplastic composition comprising a combination of: a polysiloxane-polycarbonate copolymer and a poly(aliphatic ester)-polycarbonate copolymer comprising soft block ester units of the formula (8a); wherein m is 4 to 18, wherein the thermoplastic composition has a melt volume rate of 14 cc / 10 min to 22 cc / 10 min at 300 DEG C and under a load of 1.2 Kg and a dwell time of 6 minutes, according to ASTM D1238-04, wherein an article molded from the thermoplastic composition and having a thickness of 3.2 mm has a percent transmittance of greater than 85% according to ASTM D1003-00, and wherein 100% of a set of five test articles each having a thickness of 3.2 mm and molded from the thermoplastic composition exhibit ductile fracture at -40 DEG C when measured for notched Izod Impact according to ASTM D256-04. An article comprising the thermoplastic composition is also disclosed.

Description

Background technique [0001] The present invention relates to transparent thermoplastic compositions having high flowability and ductility, in particular to a thermoplastic composition comprising polysiloxane-polycarbonate copolymers and poly(aliphatic ester)-polycarbonate copolymers, and products made therefrom. [0002] Polycarbonates, compared to other thermoplastics, are known for their excellent optical properties, heat resistance and mechanical properties such as impact strength. High flow polycarbonates, generally those of low molecular weight and / or relatively highly branched (obtained by the inclusion of trifunctional or higher functional monomers as branch points in the polycarbonate chain), for Situations are available where full mold filling capability is required for injection molding of parts with very thin dimensions and long flow lengths, where lower flow substances do not completely fill the mold before hardening, or would require excessively high mold temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L69/00C08L83/10
CPCC08L69/005C08L83/10Y10T428/269Y10T428/31663C08L83/00C08L2666/14C08G63/64C08G77/448C08L69/00
Inventor 乔恩.M.马里诺斯基斯里拉马克里什纳.马鲁武达安尼鲁达.辛格
Owner SHPP GLOBAL TECH BV
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