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MULTI LAYER THERMOPLASTIC MATERIALS, METHODS OF MAKING AND ARTICLES FORMED THEREFROM

IP.com Disclosure Number: IPCOM000029341D
Publication Date: 2004-Jun-24
Document File: 15 page(s) / 61K

Publishing Venue

The IP.com Prior Art Database

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Abstract

A multi layer thermoplastic material, comprising a thermoplastic cap stock layer disposed adjacent to a thermoplastic substrate, wherein the cap stock layer has a shrinkage value within about 15% of the shrinkage value of the substrate and/or a coefficient of thermal expansion within about 15% of the coefficient of thermal expansion of the substrate

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MULTI LAYER THERMOPLASTIC MATERIALS, METHODS OF MAKING AND ARTICLES FORMED THEREFROM

BACKGROUND

[0001]   Compositions comprising poly(arylene ether) are widely used in a variety of applications.  In some instances compositions comprising poly(arylene ether) may exhibit yellowing and/or diminished mechanical properties upon weathering.  Additionally, yellowing can limit the range of available colors for the poly(arylene ether) containing compositions.

[0002]   There remains a need to improve the weatherability of compositions comprising poly(arylene ether).

SUMMARY

[0003]   The above described and other drawbacks and disadvantages of the prior art are alleviated by a multi layer thermoplastic material, comprising a thermoplastic cap stock layer disposed adjacent to a thermoplastic substrate, wherein the cap stock layer has a shrinkage value within about 15% of the shrinkage value of the substrate and/or a coefficient of thermal expansion within about 15% of the coefficient of thermal expansion of the substrate.

[0004]   Another embodiment is a method of forming a multi layer thermoplastic material comprising co-extruding or laminating a substrate with a cap stock layer and an optional tie layer, wherein the cap stock layer has a shrinkage value within about 15% of the shrinkage value of the substrate and/or a coefficient of thermal expansion within about 15% of the coefficient of thermal expansion of the substrate.

BRIEF DESCRIPTION OF DRAWINGS

[0005]   The Figure is a schematic representation of a multi layer thermoplastic material.

DETAILED DESCRIPTION

[0006]   One way in which to improve the weatherability of various materials such as poly(arylene ether), poly(arylene ether)/polyolefin blends and poly(arylene ether)/polystyrene blends is to employing the foregoing materials as substrate materials combined with a cap stock layer which is less prone to weatherability.  However, this approach can be problematic in that multi layer materials frequently suffer from warpage and delamination caused by differences in shrinkage values and coefficients of thermal expansion.  This problem can be solved by a multi layer thermoplastic material comprising a cap stock layer disposed adjacent to a substrate wherein the cap stock layer has a shrinkage value within about 15% of the shrinkage value of the substrate and/or a coefficient of thermal expansion within about 15% of the coefficient of thermal expansion of the substrate.

[0007]   By matching the shrinkage value and/or the coefficient of thermal expansion of the cap stock layer and the substrate the multi layer thermoplastic material will be substantially free of warpage and delamination.  When the shrinkage valves of the cap stock layer and the substrate vary from each other by more than about 15%, warpage typically results, resulting in a curled and difficult to manage multi layer material.  When the coefficient of thermal expansion of the cap stock layer and the substrate vary by greater than about 15% del...