Abstract: A multipurpose additive system comprising(a) an alkali metal zeolite, an alkaline earth metal zeolite, zinc zeolite, or mixtures thereof;(b)(i) an aliphatic compound containing at least six carbon atoms substituted with one or more polar functional groups sufficient to provide a polar group frequency factor of at least about 0.01; or(ii) a polydimethylsiloxane compound containing from 4 to about 500 siloxane units, substituted with one or more polar functional groups sufficient to provide a polar group frequency factor of at least about 0.01; or(iii) mixtures thereof in any proportion; and(c) optionally, zinc oxide.

Abstract: A polyurethane-based water-in-water multicolor paint composition is provided having a disperse phase and a continuous phase. The disperse phrase preferably is comprised of a water dispersible, film-forming, crosslinkable, polyurethane polymer system; hydroxy (lower alkyl) cellulose; quaternized water soluble cellulose ether; peptized clay; and water. The continuous phase preferably is comprised of such a polyurethane polymer system, a peptized clay and water. Methods for preparing the paint are also provided.

Abstract: An aqueous coating composition is provided which reflects light, especially UV radiation, and can be colored as desired. It is prepared from a synthetic resin dispersion and inorganic pigments having a particle size ranging between 7 and 10 nm, with the exception of carbon black.

Abstract: Aqueous-based microsilica slurries having resistance to gelling and settlement of solids are provided. The slurries contain amino alcohols as stabilizing agents, the amino alcohols having the formula ##STR1## wherein R.sup.1 and R.sup.2 are each individually hydrogen or a linear or branched alkyl group containing 1 to 6 carbon atoms; R.sup.3 is a linear or branched alkylene group containing 1 to 8 carbon atoms; and R.sup.4 and R.sup.5 are each individually hydrogen, a linear or branched alkyl group containing 1 to 8 carbon atoms, or a linear or branched hydroxyalkyl group containing 1 to 8 carbon atoms.Also provided are hydraulic cement compositions comprising a hydraulic-cement binder, microsilica, and an amino alcohol of the invention.

Abstract: A silicon carbide-reinforced light alloy composite material comprises a matrix of a light weight alloy and a reinforcing material consisting of at least one of a silicon carbide whisker and a silicon carbide grain. In the composite material, the content of SiO.sub.2 contained in the reinforcing material, is set in the range of 0.05 to 5.0% by weight.

Abstract: Finely divided precipitated silica with high structure and a______________________________________ BET surface (DIN 66 132) of 150 to 350 m.sup.2 /g Stamping density (DIN 53 194) between 60 and 120 g/l DBP number between 3.0 and 4.0 ml/g Particle size distribution at least 70% from 1 to 6 .mu.m ______________________________________can be prepared by heating a mixture of water and sodium silicate under agitation to a temperature of 70.degree. to 80.degree. C., adding concentrated sulfuric acid into this mixture until half of the alkali present has been neutralized, shearing the reaction mixture and optionally raising the temperature at the same time to 86.+-.5.degree. C. Concentrated sulfuric acid is added after a period of 30 to 120 minutes at a rather high rate until the pH of the silica suspension produced is 3.0 to 3.

Abstract: A water-in-water multicolored paint composition is provided having a disperse phase and a continuous phase. The disperse phase preferably is comprised of water dispersable, film-forming, crosslinkable, carboxylated polymer; crosslinking agent; hydroxy (lower alkyl) cellulose; quaternized water soluble cellulose ether; peptized clay; and water. The continuous phase preferably is comprised of a water dispersable, crosslinkable, carboxylated polymer or copolymer, a peptized clay and water. Methods for preparing the paint are also provided.

Abstract: Novel Pigmentary colorants, well adapted for the production of electrostatic developer powders and dentifrices, are comprised of coprecipitated/crystallized mineral oxide particulates and at least one dye. The at least one dye is at least partly physically confined within a matrix of the mineral oxide.

Abstract: The present invention relates to a silica-coated calcium pyroborate pigment in particulate form and to its use as a corrosion inhibitor and film preservative in paints.

Abstract: A method of producing pure and dense amorphous fused synthetic silica. Silica of desired purity is wet pelletized or agglomerated to form particles having an average particle size of between about 5 and 2500 microns. These particles are calcined to volatilize impurities and increase density to at least about 0.9 g/cm.sup.3. Calcined particles are classified by size or reduced in size if desired or needed by grinding in such a way that the purity of the product is maintained.

Abstract: A paper and coating composition for use in gravure printing. The paper is coated with the composition which includes a pigment containing a layer lattice silicate which has a relatively narrow range of particle size distribution compared with pigments of conventional paper coating compositions, and which includes not more than 5%, by weight, of particles which have an equivalent spherical diameter of less than 0.25 microns. Gravure printing utilizing such paper gives good results even when the coating weight of the composition is relatively low. Furthermore, good results can be achieved when the composition includes a significant proportion of relatively coarse particles.

Abstract: Disclosed is a filler for ink jet recording paper, said filler being composed of amorphous silica having a median diameter, measured by the coulter counter method, of 2 to 15 .mu.m, an oil absorption of at least 180 ml/100 g, a refractive index, measured by the solvent method, of at least 1.450, and a moisture absorption, measured when it is caused to absorb moisture for 200 hours at a relative humidity of 90% and a temperature of 25.degree. C., of at least 35%.

Abstract: Disclosed is a filler for ink jet recording paper, said filler being composed of amorphous silica particles having a median diameter, measured by the coulter counter method, of 2 to 15 .mu.m, an oil absorption of at least 180 ml/100 g, a refractive index, measured by the solvent method, of at least 1.450, and a moisture absorption, measured when it is caused to absorb moisture for 200 hours at a relative humidity of 90% and a temperature of 25.degree. C., of at least 35%, and a coating of a compound of a metal of Group II of the periodic table on the surface of the silica particles in an amount of 0.5 to 20% by weight.

Abstract: The invention disclosed is a fire resistant inorganic coating composition which intumesces when subject to high temperatures to form a substantially continuous heat insulating structure and retains this structure for prolonged periods at temperatures up to 1000.degree. C. The coating composition comprises______________________________________ Parts by Weight ______________________________________ sodium silicate (aqueous solution) 40-70 potassium silicate (aqueous solution) 40-70 silicon carbide powder 3-15 ______________________________________A composite fire-protective coating system is also disclosed which comprises a plurality of coatings sequentially applied to the substrate, typically aluminum, to be protected. Specifically, a first heat resistant, substantially air impermeable bonding layer and an inorganic intumescent layer as described above. An additional heat resistant air impermeable layer may be included as a top coat. Some applications may require an additional inorganic intumescent layer.

Abstract: Removal of classified particles from the classifier apparatus is simplified by the addition of a polymeric dispersant in the slurry, added in an amount substantially in excess of that needed to disperse the particles.

Abstract: Pyrogenically prepared silicic acid is compressed by a rotary filter equipped with a pressing band.

Abstract: Hydroxyfunctional carboxamide compounds of formula I ##STR1## are included in thixotropic formulations containing highly disperse silica as a thickening or thixotroping component in order to activate the silica or enhance its effect, to amerliorate any tendency of the silica to settle and/or to prevent weakening of the thixotroping effect of SiO.sub.2 in formulations which themselves form relatively strong hydrogen bonds. The compounds of formula I may be added to silica-containing thixotropic liquid formulations to improve the thixotropy, or highly disperse silica may be coated with such compounds for later incorporation into liquid systems to render them thixotropic.

Abstract: Thermostable bismuth vanadate/molybdate pigments are prepared by precipitating onto a pigment, obtained by calcination, of the formulaBi VO.sub.4 .cndot.Bi.sub.2 Mo O.sub.6where n is 0.2-2.5, in aqueous suspension at 70.degree.-100.degree. C. within the pH range from 4 to 9.5 a first SiO.sub.2 -containing layer using an alkali metal silicate solution of a magnesium hexafluorosilicate solution, maintaining the suspension at 70.degree.-100.degree. C. for not less than 1 hour, producing a thick coating on the precoated pigment by adding further alkali metal silicate solution, magnesium hexafluorosilicate solution or a mixture of the two within the pH range from 4 to 9.5, and finally depositing wax on the SiO.sub.2 -containing layer by means of a waxing emulsion/dispersion, the products showing, compared with the starting pigment, an appreciably improved thermal stability in plastics.

Abstract: Silicic acid or silica particles having initially surface-located hydroxyl groups are modified by replacing at least partially the hydroxyl groups by an organic group to impart the particles with emulsion-breaking and foam-destroying properties. Processes for preparing the modified particles are also disclosed.

Abstract: A composition to produce an adherent and water insoluble deposit on substrate surfaces. A coating material for these surfaces is described which can be applied at any temperature up to at least 2,000 degrees Fahrenheit, with the resultant deposit (after drying) being highly adherent and water insoluble. This coating has a liquid phase formed from at least water, a pre-reacted lithium silicate, and unreacted lithium hydroxide monohydrate. Preferably, the liquid phase contains a dispersent in the form of a clay, for example. Typically the pre-reacted Li.sub.2 O-SiO.sub.2 has a SiO.sub.2 :Li.sub.2 O molar ratio of about 4.6:1, and the unreacted LiOH.H.sub.2 O provides from 1/3 to 2/3 the total lithium oxide content, giving a final SiO:Li.sub.2 O molar ratio of the composition of from about 1.71:1 to about 2.97:1. To this liquid phase is added a suitable pigment or other refractory material, at about 6-80 wt % based upon the liquid phase. A range of compositions is discussed as well as typical results.

Abstract: An anti-corrosion coating and pigment therefore, the latter comprising the combination of condensed aluminum phosphate with a comminuted zeolite or silica and process for the preparation thereof.