Ppg Industries, Inc.

Ppg Industries Ohio, Inc.

Laurence E Jones

Thomas G Krivak

Harold E Swift

Harlan B Johnson

J Douglas Mansell

Dennis W Carson

Roger A Crawford

James L Boyer

Robert C Wang

Shantilal M Mohnot

Laura M Randall

Robert H Fear

Amorphous precipitated silica which may be used to form battery separators of very low specific resistance is characterized by (a) a CTAB surface area in the range of from 140 to 185 m.sup.2 /g; (b) a DBP oil absorption in the range of from 210 to 310 cm.sup.3 /100 g; (c) a mean ultimate particle size in the range of from 10 to 18 nm; (d) a total intruded volume in the range of from 2.6 to 4 cm.sup.3 /g; and (e) an intruded volume in the range of from 0.9 to 2 cm.sup.3 /g for pores having diameters in the range of from 20 to 100 nm.

Amorphous precipitated silica

Amorphous precipitated silica is characterized by a standard white area of less than 0.8 percent. The low standard white area is a characteristic of the silica which is indicative of high (i.e., very effective) dispersion when the silica is incorporated into organic rubber compositions which are cured. Cured organic rubber compositions comprising amorphous precipitated silica exhibit low white areas which indicate high dispersion of the silica in the compositions.

Amorphous precipitated silica characterized by high dispersion in cured

A statistically large population of particles of amorphous precipitated silica comprising pigmentary phase particles and glassy phase particles and having a glassy phase fraction in the range of from 0.3 to 30 area percent is useful as an abrasive for dentifrice compositions, especially toothpaste.

Amorphous precipitated silica abrasive

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

Finely divided, fluosilicate-treated silica, such as silica flatting agent for use in coating formulations, is prepared by blending in a dry, finely divided state, silica and divalent metal fluosilicate, notably magnesium fluosilicate. In a preferred embodiment, dry pellets of amorphous, precipitated silica and dry magnesium fluosilicate are milled together to produce the fluosilicate-treated flatting agent. In another embodiment, an aqueous solution of magnesium fluosilicate is applied to silica pellets which are then milled.

Soft-settling fluosilicate-treated silica flatting agent

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Monroeville, PA, United States of America

Laurence E Jones