Bituminized roof sheet

US4287248A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Wolfgang Gessner · Kelkheim, DE
• Helmut Kuhn · Weißenbrunn, DE
• Kurt Plotz · Idstein, DE

Key dates

• Filing date: Jun 19, 1979
• Grant date: Sep 1, 1981
• Expiry date: Jun 19, 1999

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T442/656
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The flame resistance of a bituminized roof sheet consisting of a reinforced fleece, a metal foil and bitumen is improved substantially by applying a metal foil to one face. A rupture of the metal foil in the case of stress due to elongation is prevented by wrinkling it. The elongation reserve thus obtained is in the range of from 2 to 35%.