Process for the preparation of transparent, shaped articles containing polyesters comprising a cyclobutanediol

US7959836B2 · 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: Jun 14, 2011
• Expiry date: Nov 14, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31739
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Disclosed is a process for the preparation of shaped articles such as, for example, sheeting, films, tubes, bottles, preforms and profiles, having high transparency and low haze, and comprising immiscible blends of at least one polyester comprising 2,2,4,4-tetramethyl-1,3-cyclobutanediol, and a copolyamide or a transamidized, homogeneous blend of a least two polyamides. The components of the immiscible blend 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 the polymer composition to produce transparent shaped articles. These articles may have one or more layers and can exhibit improved excellent barrier properties and good melt processability while retaining excellent mechanical properties. Metal catalysts can be incorporated into the compositions to produce shaped articles having oxygen-scavenging properties.