Pulverulent materials
AssigneeEvonik Degussa GmbH
InventorsSteffen Hasenzahl, Claus-Peter Drexel, Jürgen Meyer
Life of this patent
Estimating the term…
Abstract
Pulverulent materials which contain surface-modified and structure-modified pyrogenically prepared metalloid or metallic oxide for the purposes of improvement.
Claims11
Pulverulent materials and mixtures thereof, comprising one or more modified pyrogenically prepared metalloid or metallic oxides having a surface modification and a structure modification wherein the modified pyrogenically prepared metalloid or metallic oxide is
- a silanized silica having alkylsilyl groups which are octylsilyl and/or hexadecylsilyl attached to said silica, and having the following physiochemical properties:
- BET surface area
- 25-400 m2/g
- Average primary particle size
- 5-50 nm
- pH value
- 3-10
- Carbon content
- 0.1-25%
- DBP number %
- <200%.
Method of improving the flowability of pulverulent materials and mixtures thereof, comprising adding to the pulverulent materials and mixtures thereof one or more surface-modified and structure-modified pyrogenically prepared metalloid or metallic oxides wherein the surface-modified and structure-modified pyrogenically prepared metalloid or metallic oxide is
- a silanized structure-modified silica having alkylsilyl groups which are octylsilyl and/or hexadecylsilyl attached to said silica, and having the following physiochemical properties:
- BET surface area
- 25-400 m2/g
- Average primary particle size
- 5-50 nm
- pH value
- 3-10
- Carbon content
- 0.1-25%
- DBP number %
- <200%.
A composition of matter comprising at least one pulverulent material which is a fire-extinguishing powder and at least one surface-modified pyrogenically prepared metalloid or metallic oxide wherein the surface-modified and structure-modified pyrogenically prepared metalloid or metallic oxide is
- a silanized structure-modified silica having alkylsilyl groups which are octylsilyl and/or hexadecylsilyl attached to said silica, and having the following physiochemical properties:
- BET surface area
- 25-400 m2/g
- Average primary particle size
- 5-50 nm
- pH value
- 3-10
- Carbon content
- 0.1-25%
- DBP number %
- <200%.
Pulverulent materials and mixtures thereof, comprising one or more silanized silica having alkylsilyl groups which are octylsilyl and/or hexadecylsilyl attached to said silica, and having the following physiochemical properties:
- BET surface area
- 25-400 m2/g
- Average primary particle size
- 5-50 nm
- pH value
- 3-10
- Carbon content
- 0.1-25%
- DBP number %
- <200%.
Dependencies are inferred from the claim text.