Abstract: A process is disclosed for the coextrusion of a multi-layered tube whereby at least one stream of molten polymer from a single-screw extruder is passed through a die; wherein the stream is divided into two concentric streams which are balanced by varying the area of a restrictor orifice placed in the central stream. Spider lines in the outer molten stream are eliminated by the use of a second restrictor means used downstream of an open chamber for reuniting the melt, which chamber is downstream of the spider legs.

Abstract: Disclosed is a process for the production of a hollow article comprised of a biaxially oriented thermoplastic resinous material, comprising the steps of heating a sheet of thermoplastic material to a temperature above the orientation temperature of the thermoplastic material; clamping an area of the heated thermoplastic sheet between a first mold half and a second mold half, the first mold half containing a pre - form mold surface having a configuration predetermined to provide for uniform wall thickness of the hollow article to be formed, the surface being at a temperature which is not higher than the orientation temperature of the thermoplastic material, and the second mold half having a cavity which corresponds to the shape of the hollow article to be produced; forcing the heated thermoplastic sheet by pressure differential into the first mold half against the surface; maintaining the thermoplastic sheet in contact with the surface for a period of time sufficient to bring the thermoplastic sheet to its ori

Abstract: An apparatus for preparing vinyltoluene comprising passing ethyltoluene through a dehydrogenation zone to form vaporous crude vinyltoluene, adding from about 50 to about 100 parts per million by weight of a polymerization inhibitor such as a nitrated phenol to the vaporous crude vinyltoluene at a temperature between about 200.degree. and about 300.degree. C., condensing the vaporous crude vinyltoluene, maintaining the pH of the aqueous phase of the condensed crude vinyltoluene at a value between about 5.5 and about 6.

Abstract: A process for the selective alkylation of a monoalkyl benzene in which the alkyl substituent is either methyl or ethyl, to yield a dialkylbenzene product in which the para isomer of the disubstituted product is present in a concentration greater than in a thermodynamic equilibrium is provided. The method essentially comprises passing the monoalkyl benzene and an alkylating agent capable of methylation or ethylation through a reaction zone containing a crystalline silica polymorph silicalite catalyst. Water, in the form of steam, can be co-fed as an option.

Abstract: A process for suppressing production of ortho isomers during catalytic alkylation of monoalkylbenzenes which comprises contacting the aromatic substrate with an alkylating agent in the presence of a crystalline silica polymorph silicalite catalyst material.

Abstract: Disclosed is a rotation control circuit for positioning a rotating member driven by a motor comprising a power supply and a motor relay which is energized by the power supply. A circuit is provided for intermittently energizing the relay. The circuit may comprise a first switch means connected to the power supply and a second switch means connecting the first switch means to the motor relay. The second switch means is normally closed and a timer is connected to the first switch means which is operable in response to a closing of the first switch means to generate a relay energizing signal after a predetermined time delay. This signal is operable, through an associated relay, to open the second switch means and thereby deenergize the motor relay after the predetermined time delay. The control circuit is also operable to energize the motor relay in the continuous mode. Finally, safety interlocks are provided in the control circuit to minimize any hazards to operating personnel.

Abstract: Disclosed is an apparatus and process for producing multiple-layer film or sheeting which includes an improved laydown means comprising adjustable cam-actuated control means for controlling the polymer flow and individual layer thickness.

Abstract: Disclosed is a process and apparatus for extrusion of multiple-layer sheeting comprising an improved co-extrusion feedblock and valve plate for laying down co-extruded resin streams onto a main extruded polymeric resin. The new design provides advantageous external control of the layer number as well as a more refined control of layer thicknesses.

Abstract: Methods are disclosed for the treatment of food, beverage, and medicine containers and the like, which are made of organic polymeric resins, to greatly increase the gas barrier properties thereof. The containers are ion-plated with a very thin flexible layer of an inorganic oxide.

Abstract: Methods and apparatus are disclosed for the bonding together of two similarly shaped articles of similar thermoplastic material utilizing oscillatory motion between the two articles to generate frictional heat therein sufficient to form an hermetic seal therebetween.

Abstract: Disclosed is a process for the distillation of readily polymerizable vinyl aromatic compounds and a new polymerization inhibitor therefor. The process comprises subjecting a vinyl aromatic compound to elevated temperatures in a distillation system in the presence of a new polymerization inhibitor comprising 2,6-dinitro-p-cresol. Also disclosed is a distillation method and apparatus for use with this inhibitor.

Abstract: Disclosed is a process for extruding thermoplastic resinous compositions, comprising the steps of heat plastifying the resinous composition in an extruder; cooling the heat plastified resinous composition exiting from the extruder to a uniform temperature desired for extrusion through an extrusion die, including conveying the resinous composition through at least one enclosed flow path in a cooling device, circulating a cooling medium about the entire circumference of each of the resin flow paths and controlling by the means of orifices the flow of thermoplastic at the inlet and the outlet of the cooling device across substantially the entire cross-section of each of the resin flow paths; and, extruding the cooled thermoplastic resinous composition through an extrusion die downstream of the cooling device.

Abstract: Surface active compositions for dispersing oil slicks consisting essentially of specified proportions of a fatty acid sorbitan monoester, a polyalkyleneoxide adduct of a fatty acid sorbitan monoester, an aqueous solution of a dialkylsulfosuccinate salt, a glycol monoether and water and a method for dispersing an oil slick on water comprising applying a surface active composition of the above-described type to the surface of the oil slick.

Abstract: Disclosed is a method and apparatus for determining the quality of a spinweld bond produced on a single or multiple spindle production spinwelder and to a method and apparatus for alarming and/or ejecting products containing defective welds.The method and apparatus of the present invention utilizes a detector means to determine the condition of a tool or spindle (i.e., if it is still "live" rotating at a point when it should be at rest) and a timing means to actuate an indicator when a live tool is detected. The present invention also involves a means to detect a spinwelder with an actuated indicator and to eject the product thereon. The present invention also relates to a method and apparatus for automatically shutting down a spinwelder producing an excess of defective products.

Abstract: A compound and a process for utilizing the compound to prevent the polymerization of vinyl aromatic compounds, such as styrene, during heating. The composition includes effective amounts of 2,6-dinitro-p-cresol and either a phenylenediamine or 4-tert-butylcatechol respectively, to act as a polymerization co-inhibitor system in the presence of oxygen.

Abstract: A compound and a process for utilizing the compound to prevent the polymerization of vinyl aromatic compounds, such as styrene, during heating. The composition includes effective amounts of 2,6-dinitro-p-cresol and either a phenylenediamine or 4-tert-butylcatechol respectively, to act as a polymerization co-inhibitor system in the presence of oxygen.

Abstract: A compound and a process for utilizing the compound to prevent the polymerization of vinyl aromatic compounds, such as styrene, during heating. The compound includes effective amounts of phenothiazine, 4-tert-butylcatechol and 2,6-dinitro-p-cresol respectively, as a polymerization inhibitor system in the presence of oxygen resulting in a less viscous polymer tar and in the effective inhibition of polymerization to temperatures as high as 150.degree. C.

Abstract: A spin welding system, and more particularly a gripping and aligning assembly, is disclosed for the fusing together of the two telescoped halves of a rigid gelatin capsule, which assembly utilizes a flexible diaphragm activated by an air pressure/vacuum source.

Abstract: A method of, and apparatus for, forming thin-walled synthetic plastic containers and like articles wherein areas are stretched out of the plane of heated thermoplastic material a portion of the axial length of the containers or articles to be formed to form top and bottom preforms, each with an open and a closed end; each preform, while still in the webs, is further axially and radially stretched, at a temperature conducive to orientation of the molecular and crystalline structure of the material, to a greater length still less than the axial length of the container or article to be formed; the preforms are severed from the webs to provide open ended top and bottom sections; and the open ends of pairs of top and bottom preforms are assembled and welded together to form the containers or articles.