Ethylene polymers having superior clarity enhanced toughness, low extractables, and processing ease

US6159617A · kind A · utility

Assignee

• Univation Technologies, LLC · US

Inventors

• George N. Foster · Bloomsbury, US
• Tong-Yu Chen · Baoshan, TW
• Robert Harold Vogel · Ringoes, US
• Scott H. Wasserman · Bound Brook, US
• Day-Chyuan Lee · Doylestown, US
• Walter T. Reichle · Hackettstown, US
• Frederick J. Karol · Montgomery, US
• Gregory T. Whiteker · Carmel, US

Key dates

• Filing date: Apr 2, 1998
• Grant date: Dec 12, 2000
• Expiry date: Apr 2, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31938
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Ethylene polymers having a) a Polydispersity Index of about 2 to about 4; b) a melt index, MI, and Relaxation Spectrum Index, RSI, such that (RSI)(MI.sup.0.6) is about 2.5 to about 6.5; c) a Crystallizable Chain Length Distribution Index, L.sub.w /L.sub.n, of about 1.0 to about 9; and d) a density, .rho., and a percent haze when fabricated into films such that the percent haze is less than 370.rho.-330, are provided. These ethylene polymers advantageously combine superior clarity and toughness with low extractables and enhanced processing ease.