High drawdown extrusion process with greater resistance to draw resonance

US5395471A · 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: Jun 29, 1993
• Grant date: Mar 7, 1995
• Expiry date: Jun 29, 2013

Classification

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

Abstract

A process for extruding a thermoplastic composition at higher drawdown rates with less neck-in and greater resistance to draw resonance as well as processes for extrusion coating a substrate and for making an extrusion-cast film are disclosed. The thermoplastic composition is made of 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.