Donald Wayne Dubois

US Patent:

7465412, Dec 16, 2008

Filed:

Feb 24, 2005

Appl. No.:

11/065231

Inventors:

Stanley R. Pickens - Monroeville PA, US
Fred Abraham - Wheeling WV, US
Donald W. DuBois - Magnolia TX, US

Assignee:

PPG Industries Ohio, Inc. - Cleveland OH

International Classification:

C01B 11/06

US Classification:

25218728, 2521871, 25218723, 25218724, 25218727

Abstract:

Calcium hypochlorite compositions that are classified as a Packing Group III Division 5. 1 oxidizer material or as a non-Division 5. 1 oxidizer material are described. In one embodiment, the compositions comprise an admixture of particulate calcium hypochlorite and particulate metaboric acid. The calcium hypochlorite is present in the composition in an amount and is of a concentration such that the composition would be classified as a Packing Group II Division 5. 1 oxidizer in the absence of said particulate metaboric acid. Other embodiments described are solid shaped articles, e. g. , tablets, comprising the described calcium hypochlorite-metaboric acid composition.

US Patent:

62999397, Oct 9, 2001

Filed:

Apr 28, 2000

Appl. No.:

9/560599

Inventors:

Donald W. DuBois - Irwin PA
Bernard A. Maloney - Murrysville PA

Assignee:

PPG Industries Ohio, Inc. - Cleveland OH

International Classification:

B05D 500

US Classification:

427243

Abstract:

A method of forming a liquid-permeable asbestos-free diaphragm for use in an electrolytic cell (e. g. , a chlor-alkali cell) is described. The method comprises, (a) forming a liquid-permeable diaphragm base mat of asbestos-free material on a foraminous structure (e. g. , a foraminous cathode structure); (b) drawing through the base mat a topcoat slurry comprising an aqueous medium (e. g. , deionized water), water-insoluble inorganic particulate material (e. g. , attapulgite clay) and alkali metal polyphosphate (e. g. , tetrasodium pyrophosphate decahydrate); and (c) drying the formed diaphragm. The inorganic material of the topcoat slurry is deposited on and within the diaphragm base mat.

US Patent:

51924013, Mar 9, 1993

Filed:

Jan 3, 1991

Appl. No.:

7/637110

Inventors:

Donald W. DuBois - Irwin PA
Colonel R. Dilmore - Jeannette PA

Assignee:

PPG Industries, Inc. - Pittsburgh PA

International Classification:

C25B 116
C25B 1304

US Classification:

204 98

Abstract:

A liquid permeable diaphragm for use in an electrolytic chlor-alkali cell, the diaphragm being made of fibrous material and having particulate zirconia deposited in the interstices of the fibrous matrix, prior to installing the diaphragm in the cell. Also described is a zirconia impregnated fibrous diaphragm having a zirconia topcoating applied to the anode face thereof.

US Patent:

50304038, Jul 9, 1991

Filed:

Mar 7, 1990

Appl. No.:

7/492274

Inventors:

Stanley R. Pickens - Monroeville PA
Donald W. DuBois - Irwin PA
Hou-Ching M. Yang - Bedford MA

Assignee:

PPG Industries, Inc. - Pittsburgh PA

International Classification:

B29B 902

US Classification:

264140

Abstract:

This invention relates to a method of making thermoplastic polymeric fibrils by passing an aqueous suspension of powdered thermoplastic polymeric material at high pressure through a two-stage valve assembly of the type conventionally used in liquid homogenization.

US Patent:

55672981, Oct 22, 1996

Filed:

Feb 25, 1992

Appl. No.:

7/841898

Inventors:

Donald W. DuBois - Irwin PA
Bernard A. Maloney - Murrysville PA
Stanley R. Pickens - Monroeville PA

Assignee:

PPG Industries, Inc. - Pittsburgh PA

International Classification:

C25B 1500
C25B 134

US Classification:

205350

Abstract:

Disclosed is an improved method of making chlorine and alkali metal hydroxide, e. g. , sodium hydroxide, in an electrolytic cell of the type wherein a liquid permeable diaphragm separates the anolyte from the catholyte, said method comprising adding to the anolyte, while the cell is operating, a hydrated aluminum silicate containing clay mineral, followed by lowering the pH of the anolyte by the addition of an inorganic acid and maintaining the anolyte at said lowered pH for a time sufficient to restore the cell to a predetermined current efficiency.

US Patent:

56837496, Nov 4, 1997

Filed:

Jan 9, 1997

Appl. No.:

8/781551

Inventors:

Donald W. DuBois - Irwin PA
Colonel R. Dilmore - Jeannette PA

Assignee:

PPG Industries, Inc. - Pittsburgh PA

International Classification:

B05D 500

US Classification:

427243

Abstract:

A method for preparing asbestos-free diaphragms for chlor-alkali electrolytic cells is described. The comprises establishing a liquid permeable diaphragm base mat of fibrous synthetic polymeric material and ion-exchange material on the cathode structure, treating the base mat with strongly alkaline aqueous alkali metal hydroxide having a concentration of from about 15 to about 40 weight percent, and providing a coating of inorganic particulate material on the base mat before the base mat has dried. Preferably, the base mat is coated with the inorganic particulate material using a slurry of the inorganic particulate material suspended in the strongly alkaline aqueous alkali metal hydroxide.

US Patent:

60599448, May 9, 2000

Filed:

Jul 29, 1998

Appl. No.:

9/124441

Inventors:

Donald W. DuBois - Irwin PA
Bernard A. Maloney - Murrysville PA
Jerry N. Kinney - Harrison City PA

Assignee:

PPG Industries Ohio, Inc. - Cleveland OH

International Classification:

C25B 1306

US Classification:

204296

Abstract:

A method of forming a liquid-permeable asbestos-free diaphragm on a cathode structure is described. The method comprises forming a liquid-permeable diaphragm base mat comprising fibrous synthetic polymeric material, e. g. , polytetrafluoroethylene, on a cathode structure, e. g. , a foraminous cathode; drawing a liquid slurry comprising an aqueous medium containing a wetting amount of surfactant and water-insoluble inorganic particulate material through the base mat, thereby to deposit said inorganic particulate material on and within the pre-formed base mat; and drying the resultant diaphragm at temperatures less than the temperature at which decomposition by-products of the surfactant are formed. The liquid slurry is substantially free of alkali metal halide and alkali metal hydroxide; and the inorganic particulate material comprises at least one oxide or silicate of a valve metal, e. g. , zirconium oxide, having a median diameter of 0.

US Patent:

62967452, Oct 2, 2001

Filed:

Apr 28, 2000

Appl. No.:

9/560598

Inventors:

Donald W. DuBois - Irwin PA
Bernard A. Maloney - Murrysville PA

Assignee:

PPG Industries Ohio, Inc. - Cleveland OH

International Classification:

C25C 706

US Classification:

204266

Abstract:

A method of operating a chlor-alkali electrolytic cell comprising a catholyte compartment containing a cathode, an anolyte compartment containing an anode, and a liquid-permeable diaphragm partitioning the catholyte and anolyte compartments, is described. The method comprises adding water-insoluble inorganic particulate material, e. g. , clay mineral, and alkali metal polyphosphate, e. g. , tetrasodium pyrophosphate, to the anolyte compartment of the electrolytic cell while the cell is operating. The water-insoluble inorganic particulate material and alkali metal polyphosphate may be added to the anolyte compartment in the form of an aqueous slurry.