Patent · US Active

Surface-modified precipitated silicas

US7816442B2 · kind B2 · utility

4Cited by

1References

21Claims

0Family size

Assignee

EVONIK DEGUSSA GMBH · DE

Inventors

Hans-Dieter Christian · Alzenau, DE
Juergen Schubert · Meckenheim, DE
Uwe Schmeier · Hasselroth, DE

Key dates

Filing date	Nov 13, 2007
Grant date	Oct 19, 2010
Priority date	—
Expiry date	Oct 20, 2028

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01P2006/80
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.