Patent · US Expired

Silica or silicic acid particles whose surface located hydroxyl groups are at least partially replaced by organic groups

US4844980A · kind A · utility

15Cited by

7References

6Claims

0Family size

Assignee

Th. Goldschmidt. AG · DE

Inventors

Burghard Gruning · Essen, DE
Ulrich Holtschmidt
Gotz Koerner · Essen, DE
Gerd Rossmy · Werden, DE

Key dates

Filing date	Apr 24, 1987
Grant date	Jul 4, 1989
Priority date	—
Expiry date	Apr 24, 2007

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31663
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Silicic acid or silica particles having initially surface-located hydroxyl groups are modified by replacing at least partially the hydroxyl groups by an organic group to impart the particles with emulsion-breaking and foam-destroying properties. Processes for preparing the modified particles are also disclosed.

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