Clifford C Reese

US Patent:

6384125, May 7, 2002

Filed:

Aug 11, 2000

Appl. No.:

09/637953

Inventors:

Debora Frances Bergstrom - Midland MI
Lisa Marie Boswell - Auburn MI
Mark David Fisher - Midland MI
James Richard Hahn - Midland MI
Timothy A. Okel - Trafford PA
Clifford Carlton Reese - Midland MI

Assignee:

Dow Corning Corporation - Midland MI

International Classification:

C08K 334

US Classification:

524492, 523213

Abstract:

This invention is a process for making modified silica filler comprising the steps of: (A) contacting an acidic aqueous suspension of precipitated or colloidal silica, optionally in the presence of a surfactant and/or a water-miscible solvent, with a combination of (a) a functionalizing coupling agent, and (b) an organometallic hydrophobing compound in a weight ratio of (a) to (b) of at least 0. 001 to 1 to form an acidic aqueous suspension of chemically treated silica filler having a pH of 2. 0 or less (B) treating the acidic aqueous suspension of the chemically treated filler with an acid-neutralizing agent to increase the pH of the suspension to a range of from greater than 2. 0 to 10, and (C) recovering the chemically treated filler. This invention is also modified silica filler that has a pH of from about 5. 0 to 10. 0, where the silica filler is made by the method of this invention.

US Patent:

6743509, Jun 1, 2004

Filed:

Oct 1, 2002

Appl. No.:

10/263439

Inventors:

Debora Frances Bergstrom - Midland MI
Gary Thomas Burns - Midland MI
Sarah Bridget Granzo - Midland MI
Csilla Kollar - Midland MI
Clifford Carlton Reese - Midland MI

Assignee:

Dow Corning Corporation - Midland MI

International Classification:

C08K 326

US Classification:

428405, 428404, 524425

Abstract:

Treating compositions for application to particles of a filler consist of 5-95 percent by weight of a silicon atom containing hydrophobic-type treating agent, and 5-95 percent by weight of a silicon atom containing functional-type treating agent, based on the weight of the composition. Useful functional-type treating agents include bis(alkoxysilylalkyl)polysulfides and mercaptoorganosilicon compounds. Useful hydrophobic-type treating agents include polyorganohydrogensiloxanes and silanol terminated silicone oligomers. The filler most preferred is precipitated (i. e. , synthetic) calcium carbonate.

US Patent:

59425903, Aug 24, 1999

Filed:

Feb 11, 1998

Appl. No.:

9/022282

Inventors:

Gary Thomas Burns - Ohain, BE
Qin Deng - Midland MI
James Richard Hahn - Midland MI
Clifford Carlton Reese - Midland MI

Assignee:

Dow Corning Corporation - Midland MI

International Classification:

C08G 7700

US Classification:

528 10

Abstract:

The present invention is hydrophobic silica gels having a reduced surface area and a method for their preparation under neutral conditions. The method comprises two steps, where in the first step the pH of a mixture comprising a silica hydrosol and colloidal silica is adjusted with a base to within a range of pH 3 to pH 6 to facilitate formation of a silica hydrogel having incorporated therein colloidal silica. In the second step the silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the silica hydrogel to form a hydrophobic silica gel having a surface area within a range of about 100 m. sup. 2 /g to 450 m. sup. 2 /g in the dry state. In a preferred process the hydrophobic silica gel is contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic silica hydrogel into a hydrophobic silica organogel.

US Patent:

51604701, Nov 3, 1992

Filed:

May 20, 1992

Appl. No.:

7/885791

Inventors:

Steven W. Graville - Eugene OR
Clifford C. Reese - Midland MI

Assignee:

Dow Corning Corporation - Midland MI

International Classification:

B29C 4300

US Classification:

264123

Abstract:

The present invention is a simple method for densifying colloidal silica. The method comprises feeding colloidal silica, recovered from a smelting process and having a density within a range of about 50 kg/m. sup. 3 to 300 kg/m. sup. 3, by a nearly horizontal feed means to a pair of vertically juxtaposed pressure rolls having surface depressions positioned so that the surface depressions of one roll corresponds to the undepressed surface portions of the other roll. The method does not require deaeration of the colloidal silica prior to densification and can be run as a continuous process. Colloidal silica densified by the present process is especially suitable for use as a reinforcing agent for concrete.

US Patent:

57895147, Aug 4, 1998

Filed:

Feb 24, 1997

Appl. No.:

8/806016

Inventors:

Gary Thomas Burns - Midland MI
James Richard Hahn - Midland MI
Clifford Carlton Reese - Midland MI

Assignee:

Dow Corning Corporation - Midland MI

International Classification:

C08G 7706

US Classification:

528 12

Abstract:

A method for the preparation of hydrophobic silica gels which are useful as reinforcing fillers in rubber compositions. The method comprises two steps, where in the first step a silica hydrosol is contacted with a sufficient concentration of a strong mineral acid at a pH less than about pH 1 to form a silica hydrogel. In the second step the silica hydrogel is contacted with described organosilicon compounds in the presence of a catalytic amount of a strong acid to effect hydrophobing of the silica hydrogel thereby forming a hydrophobic silica gel having a surface area within a range of about 100 m. sup. 2 /g to 750 m. sup. 2 /g as measured in the dry state. In a preferred method the hydrophobic silica hydrogel is contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic silica hydrogel into a hydrophobic silica organogel.

US Patent:

57894957, Aug 4, 1998

Filed:

Feb 24, 1997

Appl. No.:

8/806011

Inventors:

Gary Thomas Burns - Midland MI
Qin Deng - Midland MI
James Richard Hahn - Midland MI
Clifford Carlton Reese - Midland MI

Assignee:

Dow Corning Corporation - Midland MI

International Classification:

C08F28300

US Classification:

525477

Abstract:

The present invention is hydrophobic organosilicate-modified silica gels and a method for their preparation under neutral conditions. The method comprises two steps, where in the first step the pH of an organosilicate-modified silica hydrosol is adjusted with a base to within a range of about pH 3 to pH 7 to facilitate formation of an organosilicate-modified silica hydrogel. In the second step the organosilicate-modified silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the organosilicate-modified silica hydrogel to form a hydrophobic organosilicate-modified silica gel having a surface area within a range of about 100 m. sup. 2 /g to 850 m. sup. 2 /g in the dry state.

US Patent:

61073512, Aug 22, 2000

Filed:

Feb 23, 1998

Appl. No.:

9/028038

Inventors:

Gary Thomas Burns - Ohain, BE
Qin Deng - Midland MI
James Richard Hahn - Midland MI
Clifford Carlton Reese - Midland MI

Assignee:

Dow Corning Corporation - Midland MI

International Classification:

B01J 1300
B01J 230
C04B 1404

US Classification:

516100

Abstract:

The present invention is neutral-aged hydrophobic silica gels having a reduced surface area and a method for their preparation. The method comprises three steps, where in the first step a mixture comprising a silica hydrosol and colloidal silica is contacted with a strong mineral acid at a pH less than about 1 to form a silica hydrogel having incorporated therein colloidal silica. In the second step the silica hydrogel is aged at a pH within a range of about pH 3. 5 to pH 8. In the third step the silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the silica hydrogel to form a hydrophobic silica hydrogel having a surface area within a range of about 100 m. sup. 2 /g to 450 m. sup. 2 /g in the dry state.

US Patent:

58075011, Sep 15, 1998

Filed:

Feb 20, 1997

Appl. No.:

8/801410

Inventors:

Gary Thomas Burns - Midland MI
Qin Deng - Midland MI
James Richard Hahn - Midland MI
Clifford Carlton Reese - Midland MI

Assignee:

Dow Corning Corporation - Midland MI

International Classification:

B01J 1300
C04B 1404

US Classification:

2523152

Abstract:

The present invention is neutral-aged hydrophobic organosilicate-modified silica gels and a method for their preparation. The method comprises three steps, where in the first step an organosilicate-modified silica hydrosol is contacted with a strong mineral acid at a pH less than about 1 to form an organosilicate-modified silica hydrogel. In the second step the organosilicate-modified silica hydrogel is aged at a pH within a range of about pH 3. 5 to pH 8. In the third step the neutral-aged organosilicate-modified silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the organosilicate-modified silica hydrogel to form a hydrophobic organosilicate-modified silica hydrogel having a surface area within a range of about 100 m. sup. 2 /g to 750 m. sup. 2 /g in the dry state.