Impregnated bodies made of expanded graphite, process for producing such bodies and sealing elements, fuel cell components and heat-conducting elements formed of the bodies

US6746771B2 · kind B2 · utility

Assignee

• SGL Carbon AG · DE

Inventors

• Oswin Öttinger · Meitingen, DE
• Jürgen Bacher · Wertingen, DE
• Werner Langer · Ludwigsburg, DE

Key dates

• Filing date: Dec 7, 2001
• Grant date: Jun 8, 2004
• Expiry date: Jan 27, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31515
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Bodies made of expanded graphite are impregnated with low-viscosity, solvent-free, storage-stable, polymerizing resins from the group of isocyanates and their co-reactants and/or epoxy resins up to resin contents of 50% by weight. A primary product is made of expanded graphite with an open pore system, with a particularly preferred range of bulk densities of from 0.5 to 1.3 g/cm3 and with an ash value of not more than 4% by weight. Such bodies can also contain a proportion of additives. Sealing elements, components in fuel cells and heat-conducting elements are formed of the impregnated, shaped and rapidly curable graphite bodies. A process for producing such bodies is also provided.