Surface-modified precipitated silicas

US7553889B2 · kind B2 · utility

Assignee

• Degussa AG · DE

Inventors

• Hans-Dieter Christian · Alzenau, DE
• Jurgen Schubert · Dirmstein, DE
• Uwe Schmeier · Hasselroth, DE

Key dates

• Filing date: May 13, 2004
• Grant date: Jun 30, 2009
• Expiry date: Sep 24, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/80
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A surface-modified precipitated silica, useful as a matting agent, contains the silica having a polymer on a surface thereof. The surface-modified precipitated silica improves the transmission of a clear coating material, having a refractive index of nD20=1.4492 and containing 5% by weight of said silica, by at least 20%, in comparison to the same clear coating material containing 5% by weight of a reference precipitated silica surface treated with a polyethylene wax.