公开(公告)号：AT175224T

公开(公告)日：1999-01-15

申请号：AT97104825

申请日：1997-03-21

Applicant: DEGUSSA

Inventor： OELMUELLER ROLF ,  MUELLER ASTRID ,  MEIER KARL ,  LUX HEINZ-GUENTHER ,  RAMB ANJA

IPC: C01B33/18 ,  A01N25/08 ,  A01N25/22 ,  A01N57/12 ,  B01D19/04 ,  C09C1/30 ,  C11D3/12

Abstract: Partially hydrophobic precipitated silica with a methanol crosslinking potential of 10-49% is new. When anhydrous, the silica has a DBP absorption > 250 g/100 g. The average particle size is 1-12 mu m and the silica has a carbon content of 0.3-1.85 %, and when dried, it loses 2.6-10 % of its weight. It has a pH of 5.5-10. The silica is prepared by mixing a silica suspension (which has been prepared using known methods) with a material that gives the silica hydrophobic properties. The mixing takes place for a very short time at conditions of low pH and high shear. The resulting suspension is filtered and washed in salt-free conditions, and the filter cake is dried, thermally treated and powdered.

公开(公告)号：DK0798348T3

公开(公告)日：1999-08-30

申请号：DK97104825

申请日：1997-03-21

Applicant: DEGUSSA

Inventor： MEIER KARL ,  OELMUELLER ROLF ,  MUELLER ASTRID ,  LUX HEINZ-GUENTHER ,  RAMB ANJA

IPC: C01B33/18 ,  A01N25/08 ,  A01N25/22 ,  A01N57/12 ,  B01D19/04 ,  C09C1/30 ,  C11D3/12

Abstract: Partially hydrophobic precipitated silica with a methanol crosslinking potential of 10-49% is new. When anhydrous, the silica has a DBP absorption > 250 g/100 g. The average particle size is 1-12 mu m and the silica has a carbon content of 0.3-1.85 %, and when dried, it loses 2.6-10 % of its weight. It has a pH of 5.5-10. The silica is prepared by mixing a silica suspension (which has been prepared using known methods) with a material that gives the silica hydrophobic properties. The mixing takes place for a very short time at conditions of low pH and high shear. The resulting suspension is filtered and washed in salt-free conditions, and the filter cake is dried, thermally treated and powdered.

公开(公告)号：MY116875A

公开(公告)日：2004-04-30

申请号：MYPI9701343

申请日：1997-03-28

Applicant: DEGUSSA

Inventor： LUX HEINZ-GUENTHER ,  MEIER KARL ,  MUELLER ASTRID ,  OELMUELLER ROLF ,  RAMB ANJA

IPC: A01N25/08 ,  C01B33/18 ,  A01N25/22 ,  A01N57/12 ,  B01D19/04 ,  C09C1/30 ,  C11D3/12

Abstract: A PARTIALLY HYDROPHOBIC PRECIPITATED SILICA, CHARACTERISED BY A METHANOL WETTABILITY OF 10 TO 49 , IN PARTICULAR WITH A DBP UPTAKE ANHYDROUS OF GREATER THAN 250 G/100 G AND A MEAN PARTICLE SIZE OF 1 TO 12 µM AND/OR A CARBON CONTENT OF 0.3 TO 1.85 AND/OR A LOSS ON DRYING OF 2.6 TO 10.0 AND/OR A PH VALUE OF 5.5 TO 10.0, IS PREPARED BY MIXING THE AMOUNT OF WATER-REPELLENT AGENT WITH THE PRECIPITATED SILICA SUSPENSION AT VERY SHORT RESIDENCE TIME AND LOW PH VALUE, FILTERING OFF THE SOLID SUBSTANCE, WASHING FREE OF SALT, DRYING, POST-TREATING THERMALLY AND MILLING. THE PARTIALLY HYDROPHOBIC PRECIPITATED SILICA CAN BE USED IN ACTIVE SUBSTANCE FORMULATIONS AND ACTIVE SUBSTANCE FORMULATIONS OF HYDROLYSIS-SENSITIVE SUBSTANCE AND IN DE FOAMING AGENTS.

公开(公告)号：DE59700063D1

公开(公告)日：1999-02-11

申请号：DE59700063

申请日：1997-03-21

Applicant: DEGUSSA

Inventor： OELMUELLER ROLF ,  MUELLER ASTRID ,  MEIER KARL ,  LUX HEINZ-GUENTHER ,  RAMB ANJA

IPC: C01B33/18 ,  A01N25/08 ,  A01N25/22 ,  A01N57/12 ,  B01D19/04 ,  C09C1/30 ,  C11D3/12

Abstract: Partially hydrophobic precipitated silica with a methanol crosslinking potential of 10-49% is new. When anhydrous, the silica has a DBP absorption > 250 g/100 g. The average particle size is 1-12 mu m and the silica has a carbon content of 0.3-1.85 %, and when dried, it loses 2.6-10 % of its weight. It has a pH of 5.5-10. The silica is prepared by mixing a silica suspension (which has been prepared using known methods) with a material that gives the silica hydrophobic properties. The mixing takes place for a very short time at conditions of low pH and high shear. The resulting suspension is filtered and washed in salt-free conditions, and the filter cake is dried, thermally treated and powdered.