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Thermoplastic blends and articles made therefrom

A thermoplastic composition and blend technology, applied in the field of thermoplastic compositions, can solve the problems of lack of impact strength and dimensional stability, etc.

Inactive Publication Date: 2008-04-09
SABIC INNOVATIVE PLASTICS IP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to shrinkage caused by crystallization, articles molded from PBT resin lack the required impact strength and dimensional stability

Method used

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  • Thermoplastic blends and articles made therefrom

Examples

Experimental program
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Effect test

preparation example Construction

[0048] Compositions can be prepared by mixing the ingredients under conditions to form a homogeneous blend. All ingredients may be initially added to the processing system, or certain ingredients may be premixed with one or more other ingredients. Blends can be formed by mixing in a single or twin screw extruder or similar mixing equipment capable of providing shear to the ingredients.

[0049] In one embodiment, the composition is prepared by conventional methods for preparing thermoplastic resin compositions, for example, by melting while mixing (eg, melt kneading) or by melt kneading after mixing. In another embodiment, compounding is followed by extrusion to obtain the molding material in the form of pellets or granules.

[0050] Articles made from the composition

[0051] In one embodiment, the composition is used to make molded articles, such as durable articles, structural products, and electrical and electronic components, among others. The composition can be conv...

Embodiment

[0055] The invention is further illustrated by the following non-limiting examples. The formulations of the examples were prepared from the ingredients listed in Table 1 below. Comparative Example 10 (not listed in Table 1) is a commercially available lubricious, flame retardant polycarbonate composition available as Lubriloy LLD FR resin from General Electric Company LNP Engineering Plastics. Comparative Example 11 (not listed in Table 1) is a commercially available lubricated polyacetal composition available as LA 541 resin from Asashi Chemical Company.

[0056] In the examples, the ingredients were mixed in a co-rotating twin-screw extruder (Werner & Pfleiderer, type ZSK40), using a screw design with mid range screw stiffness, at a melting temperature of 270-300°C , and at a speed of 45-100 kg per hour. The resulting resin mixture was then molded into test bars using typical injection molding machines, ranging from laboratory to commercial sized machines. The melting tem...

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Abstract

An internally lubricated thermoplastic composition consisting essentially of 5 to 50 wt. % of a polycarbonate; 35 to 90 wt. % of a polyalkylene terephthalate, a polyalkylene naphthanoate resin, or blends thereof; 0.5 to 4 wt. % of a modified polyolefin; and optionally, up to 30 wt. % of a flame retardant agent, with a balanced fatigue and dimensional stability properties. Articles molded from the composition of the invention display excellent wear performance properties.

Description

[0001] This application claims priority to US Provisional Patent Application Serial No. 60 / 671121, filed April 14, 2005, which is incorporated herein by reference. field of invention [0002] The present invention relates to a thermoplastic composition having good fatigue, good dimensional stability, internally lubricated properties, and articles made therefrom. Background of the invention [0003] Polycarbonate resins have been widely used in the automotive and electrical fields due to their excellent heat resistance, impact resistance and electrical properties as well as good dimensional stability. In the prior art, polycarbonate and polyolefin were blended to moderate some of the inherent properties of polycarbonate, such as high melt viscosity and poor resistance to organic solvents and poor wear / friction properties. See, for example, Japanese Patent Laid-Open No. 40(1965)-13664 and Japanese Patent Application Laid-Open No. 59(1984)-22371-). U.S. Patent No. 5,021,504 di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/06C08L67/02C08L69/00C08K3/00C08K5/00
Inventor 尼古拉·康特刘波张晓民杰扬萨·阿玛拉西科拉
Owner SABIC INNOVATIVE PLASTICS IP BV
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