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Weatherable Metallic Colors In Resinous Multilayer

IP.com Disclosure Number: IPCOM000008809D
Publication Date: 2002-Jul-15
Document File: 2 page(s) / 139K

Publishing Venue

The IP.com Prior Art Database

Abstract

Incorporation of metal flake in polymer matrices is a highly desirable design feature found in most painted metal automotive parts and many molded-in-color plastic parts.

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INVENTORS:                name withheld

COMPANY:                name withheld

Internal Docket #                  08CO7383  

Weatherable Metallic Colors In Resinous Multilayer  

 

 

Incorporation of metal flake in polymer matrices is a highly desirable design feature found in most painted metal automotive parts and many molded-in-color plastic parts.  Once exposed to UV light, some molded-in-color plastics that contain metal flake may suffer from rapid gloss loss and subsequent color loss.  Prolonged exposure to ultraviolet light may lead to surfacing roughening of the part.  Rough surfaces efficiently scatter light such that overall gloss and color are compromised.  Once gloss loss occurs, the metal flake aesthetic is masked and becomes increasingly less noticeable.

Molded-in-color parts containing metal flake are typically protected from the detrimental conditions of UV light, oxygen, and moisture by either the use of a top coat or through the inherent photochemical stability of a polymeric matrix.  Additives are also useful in weatherable applications.

Reliance on painted coatings can be inefficient and expensive and an uncoated polymeric matrix is typically unable to meet rigorous OEM weatherability requirements. 

 We have found that  block copolyestercarbonate can be used  as a barrier to preserve the initial gloss and color of a colored polycarbonate substrate which contains metal flake.  The block copolymer consists of a polycarbonate block, preferably between 10 to 20%, and a polyester block such as  a resorcinol based polyester block,  preferably between 80% to 90%.  The copolymer top layer is believed to form a self-protecting b...