Ppg Industries, Inc.

Harlan B Johnson

Aleksandrs Martinsons

Thomas G Krivak

Charles R Wiedrich

Ronald D Chamberlin

Peter P Howell

Paritosh M Chakrabarti

Cletus N Welch

Malcolm Korach

Dennis D Leatherman

J Douglas Mansell

Laurence E Jones

Dennis W Carson

Linda P Reinhardt

Ernie L Allen

Richard A Schwarz

Robert B Simmons

William A Williams

Thomas A Rechlicz

Howard H Hoekje

Melvin P Wagner

Paul L Benenati

David A Longhini

John O Snodgrass

Barbara J Anderson

Shantilal M Mohnot

John M Denison

Robert R Simmons

Samuel B Laferty

Ernie I Allen

The tendency of microporous material to discolor over a period of time when exposed to the atmosphere during normal usage can be reduced if the microporous material comprises whiteness retaining organic surface active agent.

Microporous material exhibiting increased whiteness retention

An active agent delivery device comprises (a) microporous material comprising a matrix consisting essentially of linear ultrahigh molecular weight polyolefin, a large proportion of finely divided water-insoluble filler of which at least about 50 percent by weight is siliceous, and interconnecting pores; and (b) a releasable active agent or precursor thereof associated with at least a portion of the filler.

Process of producing an active agent delivery device

Active agent delivery device

Granular calcium hypochlorite containing from about 0.001 to about 1.0 weight percent of finely-divided polyfluorinated polymer, e.g., polytetrafluoroethylene, dispersed throughout the granules is described. The product may be compressed and formed into shaped articles, e.g., tablets. The granules may be prepared by admixing the polyfluorinated polymer with particulate calcium hypochlorite, compacting the mixture and granulating the compacted product. Tablets prepared from the polyfluorinated polymer containing granular calcium hypochlorite dissolve in water at a rate slower than tablets prepared without the polyfluorinated polymer. Finely-divided calcium hypochlorite powder, e.g., powder of less than about 10 microns in size, is rendered more conveyable and compactible by the addition of the finely-divided polyfluorinated polymer; and mixtures of finely-divided calcium hypochlorite powder and particulate calcium hypochlorite is rendered more readily compactible.

Calcium hypochlorite article

Described is a porous flexible sheet of about 93 to 99.5 weight percent amorphous precipitated silica and from about 0.5 to about 7 weight percent fibrillated, unsintered polymeric material, e.g., polytetrafluoroethylene. The sheet is useful as a separator in absorbed electrolyte gas recombinant batteries, e.g., lead-acid batteries, and has a tensile strength of less than 75 pounds per square inch (0.5 MPa). The sheet preferably has a porosity of from 85 to 92 percent and exhibits an electrical resistance of less than 3.5 milliohm-in.sup.2 /10 mil when saturated with 37 percent sulfuric acid. The sheet is prepared by subjecting a dry homogeneous mixture of the silica and polymeric material, e.g., polytetrafluoroethylene, in the above proportions to mechanical shear blending forces to fibrillate the polymer and thereafter dry forming the resulting admixture into sheet form.

Gas recombinant separator

Calcium hypochlorite composition

Granular calcium hypochlorite containing from about 0.001 to about 1.0 weight percent of finely-divided polyfluorinated polymer, e.g., polytetrafluoroethylene, dispersed throughout the granules is described. The product may be compressed and formed into shaped articles, e.g., tablets. The granules may be prepared by admixing the polyfluorinated polymer with particulate calcium hypochlorite, compacting the mixture and granulating the compacted product. Tablets prepared from the polyfluorinated polymer containing granular clacium hypochlorite dissolve in water at a rate slower than tablets prepared without the polyfluorinated polymer. Finely-divided calcium hypochlorite powder, e.g., powder of less than about 10 microns in size, is rendered more conveyable and compactible by the addition of the finely-divided polyfluorinated polymer; and mixtures of finely-divided calcium hypochlorite powder and particulate calcium hypochlorite is rendered more readily compactible.

Corrosion inhibiting calcium-containing amorphous precipitated silica is described. The silica is prepared by admixing simultaneously in a reactor aqueous alkali metal silicate, e.g., sodium silicate, acidifying agent, e.g., hydrochloric acid, and a water-soluble source of calcium, e.g., calcium chloride. The product contains from 6 to 9 weight percent calcium (as CaO). The silica product may be incorporated into a coating composition used for corrodible metallic surfaces.

Article having a corrosion inhibiting coating

Corrosion inhibiting pigment

Precipitated amorphous silica useful for manufacturing microporous battery separators is prepared by establishing an aqueous solution of alkali metal silicate having an alkali metal oxide concentration of (a) from 2.1-2.6 grams per liter and a temperature of from about 179.degree. F. to 186.degree. F., or (b) from 5.6 to 7.2 grams per liter and a temperature of from 190.degree. to 198.degree. F.; adding from (a) 14.5 to 19 times or (b) 2 to 5 times respectively the amount of alkali metal silicate initially present in the initial aqueous solution simultaneously with acidifying agent, e.g., sulfuric acid, to the initial aqueous solution while maintaining the initial alkali metal oxide concentration therein substantially constant; reducing the pH of the resulting slurry to from 8 to 9; ageing the slurry at precipitation temperatures for from 15 to 90 minutes; reducing the pH of the aged slurry to from 3.8 to 4.7 and then recovering, e.g., separating, the silica from its entraining slurry, washing the recovered silica, and drying the washed precipitated silica. Optionally, the recovered and dried silica is milled after drying to produce a product having a median agglomerate particle size of from 6 to 15 micrometers.

Preparation of amorphous, precipitated silica and siliceous

Disclosed is the ultrasonic treatment of a solid polymer electrolyte to dislodge reaction products. Also disclosed is the use of an amide anodic surface to provide a hydrophobic surface. Disclosed is a SPE chlor-alkali cell having COOH p.i.m., and oxidation of the catholyte. The catholyte oxidant may be a peroxy compound, or it may be carried by an oxygen bearing particle. Alternatively, it may be a redox couple. Catalysts are disclosed. The use of an Si bipolar unit is disclosed.

Process using an oxidant depolarized solid polymer electrolyte

Disclosed is a method of electrolyzing alkali metal chloride brine between an anode and a cathode, with oxidant feed to the cathode, where the cathode is a bed of porous particles having HO.sub.2.sup.- disproportionation catalyst. Also disclosed is an electrolytic cell for carrying out the disclosed process.

Fixed bed oxygen depolarized cathode chlor-alkali cell

Disclosed is a solid polymer electrolyte electrolytic cell where one member of the anode cathode electrode pair forms a solid polymer electrolyte with a permionic membrane, and the opposite member is spaced from the permionic membrane.

Solid polymer electrolyte chlor-alkali process

Disclosed is a method of electrolyzing alkali metal chloride brine between an anode and a cathode, with oxidant feed to the cathode, where the cathode is a bed of porous particles having HO.sub.2.sup.31 disproportionation catalyst. Also disclosed is an electrolytic cell for carrying out the disclosed process.

Brine electrolysis using fixed bed oxygen depolarized cathode

Growing community of inventors

Rittman, OH, United States of America

Harlan B Johnson