Thermoplastic article having a metallic flake appearance

a technology of thermoplastic articles and flakes, applied in the field of thermoplastic articles, can solve problems such as yellowing of transparent matrix

Inactive Publication Date: 2001-07-03
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The transparent articles disclosed herein have a metallic flake appearance. These articles are formed by dispersing an amount of metal oxide-coated glass platelets in a transparent thermoplastic matrix. The amount and size of platelet

Problems solved by technology

It is important in this process to avoid excess shear because such treatment can cause physical damage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

A formulation consisting of 5 kg of a copolyester carbonate having a Melt Flow index of 11 (300C, 1.2 kg, ASTM D1238) was prepared by reacting dodecanedioic acid with bisphenol A and phosgene, as described in U.S. Pat. No. 5,025,081, which is incorporated by reference herein. Next, the 5 kg of resin powder, 13.5 g of mold release agent (pentaerythritol tetrastearate), and 3 g of tris (2,4-di-t-butylphenyl) phosphite were added to a container. 20 g of TiO2 coated glass flake, known commercially as Firemist Pearl sold by Engelhard Corporation, was added to this container. The container was sealed and mixed by shaking it in a paint shaker. The blended mixture was then compounded on a 2.5 inch single screw extruder and cut into pellets. After 4 hours drying at 220.degree. F., the pellets were molded into various test specimens.

example 2

A formulation consisting of 5 kg of a polycarbonate having a Melt flow index of 14 was prepared by reacting bisphenol A with phosgene using the interfacial method. The resin, 13.5 g of mold release agent (pentaerythritol tetrastearate), and 3g of thermal stabilizer (tris (2,4-di-t-butylphenyl) phosphite) were mixed together with 20g of TiO.sub.2 coated glass flake material, and pellets were prepared as described in Example 1.

example 3

A formulation was prepared as described in Example 2, with the exception that only 5 g of TiO.sub.2 coated glass flake was added.

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Abstract

The transparent articles described herein have interspersed small particles with a metallic glint. This appearance is achieved by dispersing metal oxide-coated glass platelets within a thermoplastic matrix. It is desirable to take steps to avoid breaking the glass platelets during the process of preparing these materials.

Description

CROSS REFERENCE TO RELATED PATENTSNoneSTATEMENT REGARDING FEDERALLY SPONSORED RESEARCHNot applicable.BACKGROUND OF THE INVENTIONThis application relates to a transparent article having a metallic flake appearance. Specifically, this application relates to an article that comprises a pigment having a metallic flake appearance dispersed within a transparent thermoplastic matrix.As thermoplastics become increasingly important in the marketplace, producers have sought to differentiate their products by making them more visually exciting to the customer. One desirable look for thermoplastics is the metal flake appearance. This appearance can be described as the look one could imagine if small pieces of metal were dispersed in molten glass, and the glass was subsequently cooled. The flakes have a metallic glint, but one perceives clear spaces between the metallic flakes such that portions of the article are completely transparent.Until now, it has been very difficult to produce a thermopl...

Claims

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Application Information

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IPC IPC(8): B44F9/10B44F9/00C08K9/02C08K9/00
CPCB44F9/10C08K9/02H01H2209/0021
Inventor ROSENDALE, DAVIDSKABARDONIS, JOHN G.
Owner GENERAL ELECTRIC CO
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