Preparation of transparent, multilayered articles containing polyesters comprising a cyclobutanediol and homogeneous polyamide blends

US7462684B2 · kind B2 · utility

Assignee

• Eastman Chemical Company · US

Inventors

• Wesley Raymond Hale · Kingsport, US
• Thomas Joseph Pecorini · Kingsport, US
• Mark Edward Stewart · Kingsport, US
• Martin Emerson Rogers · Blacksburg, US
• Spencer Allen Gilliam · Big Stone Gap, US
• Michael Duane Cliffton · Kingsport, US
• Emmett Dudley Crawford · Kingsport, US
• David Scott Porter · Middlebury, US
• Gary Wayne Connell · Church Hill, US
• Marcus David Shelby · Church Hill, US

Key dates

• Filing date: Mar 28, 2006
• Grant date: Dec 9, 2008
• Expiry date: Dec 23, 2026

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/62
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Disclosed is a process for the preparation of multilayered, shaped articles having high transparency and low haze and in which at least one layer contains at least one polyester comprising 2,2,4,4-tetramethyl-1,3-cyclobutanediol and a separate layer which contains a transamidized, homogeneous blend of a least two polyamides. The polyester component and the polyamide component have refractive indices which differ by about 0.006 to about −0.0006. The small difference in the refractive indices enable the incorporation of regrind into one or more of the layers of the article while maintaining high clarity. These articles can exhibit improved excellent barrier properties and good melt processability while retaining excellent mechanical properties. Metal catalysts can be incorporated into one or more layers to impart oxygen-scavenging properties.