Abstract: A novel thermoplastic polymer composition comprises a blend of a polyolefin graft copolymer, and a copolymer of styrene and maleic anhydride and modifications thereof.

Abstract: A novel thermoplastic polymer composition comprises a blend of a polyolefin graft polymer and a copolymer of acrylonitrile and styrene modified with a base polymer such as an acrylic polymer, a chlorinated polyethylene, or a terpolymer of styrene, acrylonitrile and a polyene modifier.

Abstract: Graft polymers are prepared by reacting an ethylenically unsaturated polymerizable monomer with a polymer of an olefin of 2 to about 8 carbon atoms in a process wherein the olefin polymer is substantially insoluble in the monomer but is capable of absorbing the monomer. In a preferred aspect, a vinyl halide polyolefin graft polymer is produced by reacting a solid polyolefin particle with a vinyl halide monomer in which the polyolefin is substantially insoluble, but is capable of absorbing the monomer. The solid particles can be contacted with the monomer in one step or in stages. When the stage-wise reaction is contined until the proportion of polyolefin in the polymer product is about 2 to about 20 weight percent, the resulting product can be formed to a transparent or translucent article.

Abstract: A novel thermoplastic polymer composition comprises a blend of a high impact vinyl halide polymer, particularly a vinyl halide-polyolefin graft polymer, and a copolymer of styrene and acrylonitrile modified with a base polymer such as an acrylic rubber or chlorinated polyethylene.

Abstract: A polyvinyl chloride having high bulk density and enhanced plasticizer absorption is produced by suspension polymerization of vinyl chloride monomer and comonomers wherein the initial suspension of ingredients is formed such that the oil phase droplets formed in the suspension are compositionally equivalent with respect to initiator, and the level of suspending agent and agitation are chosen to substantially preclude agglomeration of resin particles throughout the reaction, thereby producing resin wherein the resin grain size distribution results directly from the oil phase droplet distribution created at the start of the reaction. Seed particles of resin are introduced to the reaction mixture prior to establishing the final particle distribution.

Abstract: A polymeric binder composition for refractory aggregates is disclosed. The binder is a resole type phenolic resin, solvent and a tar, pitch or mixtures thereof. The solvent has a boiling point of greater than 75.degree. C. and is added to the resole type phenolic resin to impart a viscosity range of between 1 to 1000 poise. The tar/pitch component is combined in the solvent-resin mixture, and is incorporated within the ratios of 30:70 to 70:30 with relation to the phenolic resin. The binder results in a high carbon binder.

Abstract: Linear aromatic polyesters of bisphenols and dicarboxylic compounds are prepared by transesterification polymerization in either a fully continuous process or in a semi-continuous process wherein a first stage is conducted batchwise and a second stage is conducted in a continuous manner wherein the second stage employs a wiped film reactor, alternatively, a wiped film reactor followed by a vented extrusion reactor. The processes are preferably conducted in the presence of a catalyst in liquid form, and further under conditions wherein the catalyst is introduced to the polymerization concurrent with the introduction of liquid phase reactants to avoid substantial heating of the reactants in contact with the catalyst prior to onset of the transesterification reaction. The products of the processes have an unexpectedly low polydispersity.

Abstract: High shielding efficiencies to emissions of electromagnetic interference are achieved with molding compositions comprised of thermosetting resins and a multi-component electroconductive filler system. Compounds having a combination of at least two conductive fillers provide shielding efficiencies of 30 dB of attenuation or more to electromagnetic emissions over a frequency range of 0.5 to 1000 Mhz without adversely affecting mechanical properties and processing capabilities.

Abstract: A resin coated sand for shell-molding processes is provided comprising the coating of foundry sand or aggregates with a phenolic resin and a carboxylic acid salt. The carboxylic acid salt is selected from a carboxylic acid salt of an element selected from groups Ia, Ib, IIa, IIb, IIIa, IVa, Va, VIb, VIIa, VIIb or VIII of the Periodic Table of Elements. The proportion of carboxylic acid salt to phenolic resin is from 0.5 to 40 parts carboxylic acid salt to 100 parts phenolic resin. This resin coated sand produces shell-molds having excellent properties for casting, and allows the molded article to be removed in an easy and efficient manner.

Abstract: Linear aromatic polyesters of bisphenols and dicarboxylic compounds are prepared by transesterification polymerization in either a fully continuous process or in a semi-continuous process wherein a first stage is conducted batchwise and a second stage is conducted in a continuous manner wherein the second stage employs a wiped film reactor, alternatively, a wiped film reactor followed by a vented extrusion reactor. The processes are preferably conducted in the presence of a catalyst in liquid form, and further under conditions wherein the catalyst is introduced to the polymerization concurrent with the introduction of liquid phase reactants to avoid substantial heating of the reactants in contact with the catalyst prior to onset of the transesterification reaction. The products of the processes have an unexpectedly low polydispersity.

Abstract: A resin coated sand for shell-molding foundry operations having improved shake-out properties for molds prepared therefrom is disclosed. Also disclosed are methods of producing said sand. The foundry aggregates or sand are coated with a phenolic resin containing from 0.2 to 40 parts of an aromatic nitro compound per 100 parts of phenolic resin. The resin may be a novolac type, a resole type or a mixture of the two types of phenolic resins. Suggested aromatic nitro compounds are nitrophenols, dinitrophenols and nitronaphthalenes. The process is extremely useful for coating lower melting temperature metals such as aluminum and magnesium.

Abstract: A process for preparing resin coated sand for shell molding foundry operations is disclosed wherein the resin utilized is a phenolic resin containing a bromophenol. The resin coated sand has improved shake-out properties and is especially formulated for low melting metals such as aluminum and magnesium castings.

Abstract: An improved resin coated sand for use in foundry shell-molding applications is disclosed which has increased resistance to thermal shock at the time of pouring. The improved product uses a phenolic resin as binder with aromatic compounds selected from the following generic formulae: ##STR1## wherein m, n, x and y are integers. The foundry aggregates are mixed with the phenolic resin and organic compounds under conventional mixing conditions to form a sand-resin mixture that can be formed into shell-molds. Upon casting the molten metal into these molds, the abrupt thermal expansion of the coated sand is controlled to eliminate the cracking that occurs when conventional phenolic-sand mixtures are employed.

Abstract: A process for the preparation of a resin-coated sand for use in shell-molding operations wherein the molding operation is designed for metals such as aluminum, magnesium and their alloys which have a lower-melting temperature than iron. The process involves the coating of foundry sand with a phenolic resin incorporating a carbonate and/or bicarbonate of elements selected from groups Ia, IIa, IIIb, IVb, Vb, VIb, VIIb or VIII. This process produces a resin-coated sand with improved shake-out properties of the casting molds.

Abstract: An improved resin coated sand for use in foundry shell-molding applications is disclosed which has increased resistance to thermal shock at the time of pouring. The improved product uses a phenolic resin as binder with aromatic compounds selected from the following generic formulae: ##STR1## The foundry aggregates are mixed with the phenolic resin and organic compounds under conventional mixing conditions to form a sand-resin mixture that can be formed into shell-molds. Upon casting the molten metal into these molds, the abrupt thermal expansion of the coated sand is controlled to eliminate the cracking that occurs when conventional phenolic-sand mixtures are employed.

Abstract: This invention is concerned with foundry binder compositions for alkaline aggregates such as reclaimed sand, Olivia sand, alumina sand, etc., which cure at ambient temperatures. The binder composition is composed of phenolic resins, polyisocyanates and a hydrogen chloride emitting substance upon hydrolysis. Curing of this composition is by gaseous amines. The hydrogen chloride emitting substance on hydrolysis is selected from the following: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 can be selected from: Hydrogen, Chlorine, alkyl, vinyl or alkoxy, or(b) Thionyl chloride, sulfuryl chloride, acid chlorides of sulfur, such as methyl chlorosulfuric acid, ethyl chloroculfuric acid.

Abstract: A novel thermoplastic polymer composition comprises a blend of a high impact vinyl halide polymer, particularly a vinyl halide-polyolefin graft polymer, and a copolymer of styrene and maleic anhydride and modifications thereof.

Abstract: An improved resin binder for shell-molding operations having improved shake-out properties is disclosed. The resin binder utilizes a lubricant-containing phenolic resin of the novolac or resole type, or a mixture of novolac and resole types, incorporated therewith is an organic chloride. The organic chloride is characterized by having 20% by weight of the heating loss in the temperature range of 130.degree. to 550.degree. C. The organic chloride may be selected from chloride-containing polymers and cyclo-organic chlorides. Chlorinated polymeric material may be selected from polyvinyl chlorides, polyvinyldene chloride resins, chlorinated paraffins and chlorinated polyolefins.

Abstract: Resin coated sand for foundry shell molding operations is provided which eliminates the cracking of the molds at the time of pouring. In conventional phenolic bonded sand molds, the abrupt thermal expansion caused by the pouring of the molten metal into the mold causes the mold to crack. The resin coated sand, in this invention, is composed of foundry sand or aggregates coated with a phenolic resin which has incorporated therein, a polyethylene glycol of high molecular weight. This improved coated sand eliminates cracking at pouring and does not impair the shake-out property of the molds.

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 zone 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 stream is passed into a partially open, heated mold. The mold cavity is maintained at temperatures sufficiently high to cure the thermosetting molding material.