High drawdown extrusion composition and process

US5674342A · kind A · utility

Assignee

• THE DOW CHEMICAL COMPANY · US

Inventors

• Todd J. Obijeski · Duluth, US
• Shih-Yaw Lai · Sugar Land, US
• Rajen M. Patel · Lake Jackson, US
• Lichih R. Peng · Littleton, US
• Michael F. Langohr · Lake Jackson, US
• David C. Kelley · Angleton, US
• David A. Eversdyk · Angleton, US
• Nicole F. Whiteman · Angleton, US

Key dates

• Filing date: Mar 6, 1995
• Grant date: Oct 7, 1997
• Expiry date: Mar 6, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2314/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process and thermoplastic composition for high line speed extrusion without high neck-in and draw resonance are disclosed. The thermoplastic composition is made of at least one ethylene polymer having a Dow Rheology Index (DRI) of at least 0.1 or, alternately, at least one substantially linear ethylene polymer, used alone or in combination with at least one high-pressure ethylene polymer and/or with at least one heterogeneous linear olefin polymer.