Extrusion compositions having high drawdown and substantially reduced neck-in

US5863665A · kind A · utility

Assignee

• THE DOW CHEMICAL COMPANY · US

Inventors

• Lawrence T. Kale · Cochrane, US
• Pradeep Jain · Lake Jackson, US
• David C. Kelley · Angleton, US
• Deepak R. Parikh · Lake Jackson, US
• Sharon L. Baker · Lake Jackson, US
• Osborne K. McKinney · Lake Jackson, US

Key dates

• Filing date: Apr 21, 1997
• Grant date: Jan 26, 1999
• Expiry date: Apr 21, 2017

Classification

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

Abstract

An ethylene polymer extrusion composition having high draw down and substantially reduced neck-in, a process for making such a composition and a process of using such a composition to prepare extrusion coatings, extrusion profiles and extrusion cast films are disclosed. The ethylene polymer extrusion composition is made of 75-95 weight percent of at least one ethylene .alpha.-olefin interpolymer and 5-25 weight percent of at least one high pressure ethylene polymer characterized as having high melt strength and a broad, bimodal molecular weight distribution. In profiles, coatings or films, the composition can be used as sealant, adhesive or abuse resistance layers.