High clarity laminated articles comprising an ionomer interlayer

US8399097B2 · kind B2 · utility

Assignee

• E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

• Stephen J. Bennison · Wilmington, US
• Richard Allen Hayes · Brentwood, US
• Steven C. Pesek · Bridge City, US
• W Alexander Shaffer · Bridge City, US
• Charles Anthony Smith · Georgetown, CA

Key dates

• Filing date: Nov 2, 2009
• Grant date: Mar 19, 2013
• Expiry date: Feb 3, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31938
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A safety laminate comprises an interlayer that comprises an ionomer that is the neutralized product of a precursor acid copolymer. The precursor acid copolymer comprises copolymerized units of a first α-olefin having 2 to 10 carbon atoms and about 20 to about 30 wt % of copolymerized units of a first α,β-ethylenically unsaturated carboxylic acid having 3 to 8 carbon atoms; and has a melt flow rate of about 10 to about 4000 g/10 min. When neutralized to a level of about 40% to about 90% and when comprising counterions that consist essentially of sodium cations, the precursor acid copolymer produces a sodium ionomer that has a melt flow rate of about 0.7 to about 25 g/10 min and a freeze enthalpy that is not detectable or that is less than about 3.0 j/g. The ionomer composition may further comprise a second ionomer that has a melt flow rate of about 10 g/10 min or less.