Abstract: Improved melt spinning of friable, thermally sensitive organosilicon preceramic polymers is obtained by using externally-metered feed means for continuous feeding of the polymer to an extruder. Starve feeding by metering the feed at a rate less than that required to fill the feed screw flights prevents pulverizing and compaction of the friable polymer, leading to cross-linking of trapped polymer and solid plugging, which would cause the extruder to bind and cease to function. Metered feed can be obtained by either monitoring of screw loading or discharge pressure and adjustment of hopper feed rate or control based upon measured values of extruder speed or metering pump speed.

Abstract: Provided is a process for melt spinning a partially oriented yarn of increased birefringence, and hence higher orientation, for a given wind-up speed. The process comprises extruding a molten fiber forming polyester through a shaped orifice to form a molten filamentary material, which is then passed in the direction of its length into a quench zone wherein the filamentary material is contacted with a first gaseous quenching medium. While the filamentary material is still in a deformable state, however, it is passed through a hot zone provided with an atmosphere having a temperature greater than the first gaseous quenching medium and greater than the glass transition temperature of the molten polyester filamentary material.

Abstract: The present invention provides a process for preparing metal particle-containing powder coating compositions as well as the powder coating compositions produced by this process. The process involves spraying a solution which comprises solvent, resin, curing agent, and suspended metal particles to form droplets, and collecting the sprayed droplets in a liquid bath. The liquid bath contains a liquid which is miscible with the solvent but which is non-solvent for the solutes of the solution. The liquid bath is subjected to a radial motion. Thus the powder coating compositions are precipitated in substantially non-agglomerated form.The resulting metal particle-containing powder coating compositions are useful in powder coating applications such as powder painting when it is desired to impart a metallic finish to an article such as an automobile. These powder coating compositions are particularly useful when it is desired to impart to a surface a thin film, such as a coil coating.

Abstract: Delayed and sustained urea release compositions comprising association products with acrylic acid polymers, for ruminant feed supplementation.

Abstract: An improved process is provided for the formation of cellulose acetate filamentary material and film. Secondary cellulose acetate is dissolved in a solvent at an elevated temperature and elevated pressure to form a homogeneous solution, with the solvent being incapable of dissolving the secondary cellulose acetate at ambient conditions. The cellulose acetate solution is extruded through an appropriate shaped orifice into a gaseous atmosphere provided at substantially atmospheric pressure. A rapid precipitation or phase separation reaction occurs in the gaseous atmosphere wherein the solvent separates from the cellulose acetate to form a solid filamentary material or film which is subsequently collected. The solid product may be dried to remove remaining traces of solvent. The process is capable of implementation at rapid spinning speeds while utilizing relatively short zones wherein the phase separation is accomplished.

Abstract: Delayed and sustained urea release compositions comprising association products with acrylic acid polymers, for ruminant feed supplementation.