Abstract: A method and apparatus are described. A thermosetting molding material, suitably a synthetic resin composition such as a phenolic molding composition, is initially heated and plasticized. The plasticized mass is passed as a stream through an injection nozzle which is maintained at a temperature sufficiently high to keep the mass in a plasticized condition but sufficiently low to avoid any substantial curing or setting-up of the mass. The plasticized mass is next passed through a temperature-controlled manifold maintained at a temperature sufficiently high to keep the mass in a plasticized condition but sufficiently low to avoid any substantial curing or setting-up of the mass. In the manifold the plasticized stream is divided into two or more smaller streams which are passed through a plurality of outlets into a plurality of partially open, heated molds. The mold cavities are maintained at temperatures sufficiently high to cure the thermosetting molding material.

Abstract: A process is provided for making a prilled product from a molten substance wherein steam or heated gas is passed through the nozzle which produces the prilled product prior to the introduction of the molten substance through the nozzle at the beginning of the process.

Abstract: In a process for making a prilled product from a molten substance therefor steam or heated gas is intermittently introduced into the prilling apparatus to clean the apparatus. In one embodiment the molten substance is passed through a filter zone prior to introduction to a nozzle provided with orifices to produce the prilled product and the flow of molten substance through the filter zone is periodically interrupted and steam or heated gas is passed through the filter zone in the direction opposite to the flow of molten substance to clean the filter zone. More than one filter zone can be operated in parallel so that while one filter zone is being cleaned, molten substance is passed through another filter zone to provide for continuous operation of the process.

Abstract: Molding compositions containing a phenol-aldehyde resin, a filler material and processed mineral fiber as a processing aid are described. The compositions are suited to be extruded and comminuted to produce a nodular product essentially uniform in size and useful in injection, transfer, and compression molding processes.

Abstract: Dimensionally stable, pigmentable polyester molding compositions comprise:(A) a polymerizable polyester component; and(B) an additive component comprising discrete particles of less than about 50 microns diameter of a lightly cross-linked styrene terpolymer having a glass transition temperature of below about 100.degree. Celsius and which is chemically inert with respect to the polyester component and is swellable but insoluble therein. The additive component is the reaction product of styrene, an unsaturated monofunctional comonomer and a polyfunctional monomer such as divinyl benzene.

Abstract: A nozzle pre-heating device is provided for use in a tower for prilling molten substances. The device comprises a pre-heating chamber which is open only at the upper portion thereof for pre-heating a prilling nozzle and is closed at the bottom to shield the nozzle from the cooling effects of upper flowing gas in the prilling tower. The device is provided with means for moving either the nozzle or the pre-heating device from proximity to one another when the pre-heating device is not in use, thereby permitting free flow of the molten substance from the nozzle during normal operation of the prilling tower.

Abstract: This invention relates to a thermoplastic polymeric composition which comprises a glass fiber-filled polybutylene terephthalate and which contains as an improvement a warp-inhibiting amount of a polymeric additive consisting of a linear aromatic substantially halogen-free polyester consisting of a bisphenol monomer residue and a dicarboxylic acid monomer residue and having a relatively low intrinsic viscosity. The compositions exhibit substantially diminished warpage on molding without a deleterious effect on the other properties of the glass fiber-filled polybutylene terephthalate. Preferred compositions of the invention also exhibit enhanced tensile strength compared to comparable pure glass fiber-filled polybutylene terephthalate.

Abstract: An improved prilling tower is provided for the prilling of molten substances wherein a receiver equipped with an exhaust conduit is positioned below the nozzle during pre-heating of the nozzle prior to normal operation, after the end of a normal operating cycle or when the nozzle is replaced during operation of the prilling tower. Means are provided for moving either the receiver or the nozzle in a horizontal direction so that the nozzle is out of proximity with the receiver during normal operation of the prilling tower. More than one nozzle or more than one receiver can be employed in a prilling tower to provide for continuous operation of the prilling tower during replacement or cleaning of the nozzles.

Abstract: A color developer for pressure-sensitive copying papers is prepared by mixing a para-substituted difunctional phenol-aldehyde condensate and tri- or higher-functional phenol-aldehyde condensate. The tri- or higher-functional phenol-aldehyde condensate can be modified by a polyvalent metal.

Abstract: A color developer for pressure-sensitive copying paper is prepared by mixing a polyvalent metal salt of a para-substituted difunctional phenol-aldehyde condensate and a tri- or higher-functional phenol-aldehyde condensate and/or a polyvalent metal modified tri- or higher-functional phenol-aldehyde condensate.

Abstract: This invention relates to polymer blends having improved hydrolytic stability, moldability and flame retardancy which comprises, in admixture, (1) a linear aromatic polyester prepared from an aromatic dicarboxylic acid and a bisphenol, and (2) polyphenylene sulfide. Desirably these compositions contain as flame retardant a Diels Alder adduct of a halocyclopentadiene and a mono- or di- unsaturated organic component.

Abstract: Phenolic novolak resins are described which are structurally characterized as having from about 55% to about 90% of the available theoretical paraphenyl linkages in the resin chain bridged to a phenyl group. The resin compositions of this invention provide extended resin stability at relatively low temperatures without significant adverse affect on the cure speed at the molding temperature. The resins are especially suited for use in runnerless injection or cold manifold molding processes, but can also be used in transfer, compression and injection molding processes.

Abstract: Polyvinyl halide or polyvinyl graft copolymers intimately mixed with a polyester derived mainly from an halogenated bicycloheptene carboxylic acid or anhydride such as chlorendic acid or anhydride and an alkylene glycol or alkylene oxide such as ethylene oxide are provided. The graft copolymers of the invention are obtained by polymerizing a vinyl halide in bulk in contact with an olefin polymer. The graft copolymer compositions of the invention have good clarity and provide improved processing characteristics and increased impact strength without reduction in heat distortion resulting from the addition of the polyester. The improved impact strength polyvinyl halide compositions of the invention can include blends of the polyester of the invention with modifying compounds, such as alkyl methacrylate-butadiene/styrene graft polymer impact modifiers and halogenated polyvinyl chloride. Blends of vinyl halide polymers with the polyesters of the invention provide compositions having improved processability.

Abstract: The present invention relates to composite friction assemblies and to methods of making the assemblies. The assemblies include at least one friction member and a support member. The friction member is formed from a mixture of thermosettable phenol-aldehyde resin and filler material under conditions less than those which would thermoset the resin component. The preformed friction member is joined to the support member by molding a mixture of phenol-aldehyde resin and filler material in a mold cavity which utilizes a face of the preformed friction member as a portion thereof. The molding conditions are such that the resin component of the members are commonly cured, or thermoset, to produce a composite friction assembly.

Abstract: A lubricant-containing binder for the dry hot coat foundry method comprising a solid resol type phenolic resin and a lubricant in an amount of about 0.5 to 10 percent by weight with respect to said phenolic resin.

Abstract: Polymers of excellent impact strength, reduced particle size, and enhanced proportions of fines are obtained in the bulk polymerization of a vinyl halide or mixture thereof with comonomer(s) in the presence of a high molecular weight polyolefin added to the polymerization mass upon conversion of 0 to about 20% by weight of monomer(s) to polymer, by removing from the polymerization mass during the thick paste state thereof sufficient vinyl halide to adjust the effective concentration of polyolefin to above about 3.5% based on vinyl halide. The resultant product which contains an enhanced proportion of fines and is devoid of massive agglomerates, requires less mechanical work in comminution or shorter heating in melting in subsequent conventional processing steps.

Abstract: Unsaturated polyester resins having improved fire retardant properties comprise a halogen-containing unsaturated polyester of a polycarboxylic compound and a polyhydric alcohol together with an additive mixture comprising iron or a compound of iron, copper or a compound of copper, and a compound of molybdenum. The unsaturated polyester resin may be copolymerized with an unsaturated monomer to prepare castings, laminated products, reinforced articles and the like having low burning rates, low smoke generations, and beneficial char formation in the presence of a flame.

Abstract: Mixtures of vinyl halide-graft-polyolefin polymer compositions with a minor proportion of a monoalkenyl arene-hydrocarbon alkadiene block thermoplastic elastomer which are capable of being molded to impact-resistant articles exhibit enhancement of low temperature impact resistance on ageing.

Abstract: Polymer blends having improved hydrolytic stability comprise, in admixture, (1) a linear aromatic polyester prepared from an aromatic dicarboxylic acid and a bisphenol, and (2) a cross-linked acrylate-methacrylate copolymer. The blends are useful in preparation of films and molded articles.

Abstract: A method for manufacturing foundry sand cores and molds, which comprises preforming a foundry sand mixture comprising sand, a vinyl acetate resin and an organic solvent for said resin and optionally a resin selected from the group consisting of aromatic thermoplastic resins and aromatic thermosetting resins, and thereafter removing said solvent from the preformed foundry sand mixture by evaporation.