Abstract: Pigmentary titanium dioxide having a high durability when used in paint or the like exposed to solar radiation and methods of producing such pigmentary titanium dioxide are provided. The durable pigmentary titanium dioxide of the invention is comprised of rutile titanium dioxide particles having cerium oxide and dense amorphous silica deposited thereon. The particles preferably also have an outer coating of hydrous alumina deposited thereon.

Abstract: Improved alumina-coated inorganic pigments having a first coating of boehmite alumina, a second coating of amorphous alumina, and a third coating of boehmite alumina which exhibit good durability, dispersibility, and optical properties in plastic compositions are disclosed. Also disclosed is a process whereby an aqueous slurry of an alumina-containing inorganic pigment is milled to achieve a particular particle size distribution, a first coating of boehmite alumina is precipitated onto the pigment material within a first pH range, a second amount of an alumina coating agent is added to the aqueous slurry within a second pH range to obtain a second coating of amorphous alumina over the first boehmite alumina coating, and then the pH of the slurry is adjusted to a third pH range thus forming a third boehmite alumina coating over the second amorphous alumina coating.

Abstract: An improved process is provided for preparing durable titanium dioxide pigments having discrete layers of silica and alumina deposited thereon. The improved process includes careful control of the operating conditions of pH end temperature of a slurry of titanium dioxide pigment during the addition of the coating materials to the slurry and the deposition of the silica and alumina onto the pigment.

Abstract: The present invention is directed to a process for preparing free flowing powders of nonpigmentary titanium dioxide granular aggregates. The process comprises the providing of dried preforms of flocculated pigmentary titanium dioxide and the comminution thereof to powders of granular aggregates of enhanced bulk density and predetermined particle size.

Abstract: Chemically inert pigmentary zinc oxide compositions, useful in producing UV light stable polymeric resin compositions are prepared by wet treatment of chemically reactive zinc oxide base pigments utilizing a process wherein chemically inert organic or inorganic coatings are deposited thereon.

Abstract: There are provided titanium dioxide pigments characterized by improved gloss developing and dispersibility properties in surface coating vehicles and reduced tendencies to adsorb moisture. Said titanium dioxide pigments comprise pigmentary titanium dioxide particles having deposited thereon a treating agent comprising at least one amine salt of a polyprotic acid having pK.sub.a1 value greater than about 2.5 and a water solubility at 20.degree. C. of at least 2.0 weight percent and an alkanolamine having a pK.sub.b1 greater than about 4.4.

Abstract: A titanium dioxide pigment is provided for use in polymeric compositions comprising a pyrogenic titanium dioxide pigment which has been treated with a composition comprising an organophosphate/alkanolamine addition product.This invention provides for a novel method for treating a pyrogenic titanium dioxide pigment in order to reduce yellowing when such pigment is incorporated into a polymeric composition comprising adding to such pigment a composition which comprises an organophosphate/alkanolamine addition product.

Abstract: A titanium dioxide pigment is provided for use in polymeric compositions comprising a pyrogenic titanium dioxide pigment which has been treated with an addition system comprising:(a) an organophosphate/alkanolamine addition product, and(b) a polyol.This invention provides for a novel method for treating a pyrogenic titanium dioxide pigment in order to reduce yellowing when such pigment is incorporated into a polymeric composition comprising adding to such pigment an addition system which comprises:(a) an organophosphate/alkanolamine addition product, and(b) a polyol.

Abstract: A means for controlling special musical effects in synchronism with picking a string of a stringed musical instrument by a pick. More specifically, the disclosure describes a means whereby a signal generated as a result of a pick breaking contact with a string of the stringed instrument initiates a special musical effect. The special musical effect may alter the output of a pick-up generated by vibration of the strings, or may be independent of string vibration and merely initiated by the pick breaking contact with the string. Also, disclosed is a pick having a conductive portion and a nonconductive portion so that picking a string by the conductive portion initiates a special musical effect and picking the string by the nonconductive portion results in the instrument operating in a conventional manner without the special musical effect.

Abstract: A weather-resistant TiO.sub.2 pigment having improved optical properties is provided. The pigment is substantially encapsulated with a coating of an amorphous, dense silica in an amount between about 1% and about 7%; a coating of a voluminous silica in an amount between about 1% and about 8%; and preferably a coating of a precipitated alumina in an amount between about 2% and about 8%. In a particularly preferred embodiment the pigment further includes an innermost coating of a precipitated alumina in an amount between about 0.2 and 0.6%, the percentages of silica and alumina being calculated as % SiO.sub.2 and Al.sub.2 O.sub.3 by weight, based on the final treated TiO.sub.2 pigment. A process for manufacturing the pigment is further provided.

Abstract: A filter circuit for use in a musical instrument, such as an electronic organ, eliminating undesirable keying transients introduced into the signals provided by tone generators of the organ. The filter circuit includes a bandpass filter filtering from the keyed tone generator signals frequencies which are below and above the desired audio frequency spectrum of the output sound.

Abstract: An electronic organ includes digital circuitry for automatically enabling in a sequential manner a plurality of gates to pass tone control signals to keyers which generate corresponding tone output signals. The digital circuitry includes a tone counter which sequentially enables a plurality of tone gates, and an octave counter which sequentially enables output gates having inputs from the tone gates. A clock generates clock pulses which are rapidly counted by the note counter to sequentially scan the note gates. When a tone control signal is passed, the output of a note detector causes a divider to be inserted between the clock and the note counter to maintain enabling of the note counter.