Patent · US Active

Hydrophobic precipitated silica for defoamer formulations

US8614256B2 · kind B2 · utility

4Cited by

14References

11Claims

0Family size

Assignee

EVONIK DEGUSSA GMBH · DE

Inventors

Christian Panz · Wesseling, DE
Rene Allerdisse · Bornheim, DE
Helga Obladen · Zeven, DE
Mario Loebbus · Aschaffenburg, DE
Anja Lukas · Hanau, DE
Roland Bergmann · Großkrotzenburg, DE
Karl Meier · Bornheim, DE

Key dates

Filing date	Feb 1, 2011
Grant date	Dec 24, 2013
Priority date	—
Expiry date	Feb 1, 2031

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2995
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A hydrophobic precipitated silica having a BET of less than 110 m2/g, a CTAB of less than 150 m2/g, a BET/CTAB ratio of less than 3, a carbon content of greater than 3.1%, a pH of 9.7 to 10.5, a DBP of less than 230 g/(100 g), and a methanol wettability of more than 50%. The hydrophobic precipitated silica is used in compositions including defoamers, silicone rubber and HTV crosslinkable silicone rubber compositions. The hydrophobic precipitated silica is also useful as a flow assistant and carrier or anti-blocking agent.

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