Method of forming a thermoformable polypropylene foam sheet

US6251319A · kind A · utility

Assignee

• THE DOW CHEMICAL COMPANY · US

Inventors

• Martin H. Tusim · Newark, US
• Martin Cornell · São Paulo, BR
• Kyung W. Suh · Seoul, KR
• Christopher P. Christenson · Lake Jackson, US
• Chung P. Park · Baden-Baden, DE

Key dates

• Filing date: Apr 30, 1999
• Grant date: Jun 26, 2001
• Expiry date: Apr 30, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S264/05
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for making a polymer foam sheet, which comprises (i) extruding through an annular extrusion die a foamable composition comprising at least one polypropylene polymer and at least one blowing agent, at a pressure, temperature, and extrusion rate sufficient to prevent foaming of the composition prior to exiting the die, under conditions sufficient to form a foam tube having a density of at least 16 kg/m.sup.3 and no greater than 200 kg/m.sup.3, an open cell content of less than 70 percent, a circumference of at least 1 meter, and a foam thickness of at least 2 mm and no greater than 25 mm, wherein the blowing agent is used in an amount of from 0.2 to 4.5 moles per kg of polymer, (ii) allowing the foam to cool to a temperature below the melt temperature of the polypropylene, and (iii) cutting the tube of foam along its radius to form a foam sheet, wherein at least 70 percent by weight of the polymer in such sheet is a polypropylene having a melt strength in the range of from 25 to 60 cN when measured at 190.degree. C.