Abstract: Poly(tetramethylene ether) glycol is prepared by polymerizing tetrahydrofuran, using(1) a polymeric catalyst which contains sulfonic acid groups, and(2) a chain terminator which is water or 1,4-butanediol.

Abstract: Anhydrous hydrogen fluoride is manufactured by dropping small particles of a metal fluoride, e.g., calcium fluoride, through a reaction zone countercurrent to a gas stream containing sulfur trioxide, sulfuric acid and water vapor.

Abstract: An intimate blend of aromatic polyamide staple fiber components comprising 45-55 weight percent poly(m-phenylene isophthalamide) fibers and 45-55 weight percent poly(p-phenylene terephthalamide) fibers whose stress-strain curve exhibits no yield point.

Abstract: A peripheral band is used as a load-containment device in a high-capacity, swinging bucket centrifuge rotor. The peripheral band is concavo-convex in radial cross-section such that the mid portion of the band is thinner than the edge portions to provide increased structural strength and reduced wind resistance. The rotor includes a hub and a shaped disc-like piece of sheet metal which forms the bottom of the rotor and interconnects the rotor hub with the peripheral band. The rotor bottom supports the band against gravity. The swinging buckets themselves are mounted on pivots secured to the band. In this manner, the available volume of the inside of the rotor cavity is increased.

Abstract: A coating composition consisting essentially of certain heat-stable polymers, colorants, antioxidants, and liquid carrier useful for coating an article to produce a finish which is capable of maintaining its hue and having a decorative pattern produced within it is provided.

Abstract: A coating composition comprising(a) a binder containing a polysiloxane resin-forming precondensate and an epoxy resin,(b) a dimethylpolysiloxane fluid,(c) a fluorocarbon polymer,(d) an inorganic hardening agent, and(e) an inert liquid carrier.The composition forms finishes that have thermal stability, release properties, high gloss, hardness, abrasion resistance, and excellent adhesion to unprimed, untreated metal substrates.

Abstract: Process for drying a water-wet permselective membrane by contacting the membrane with water replacement liquid under conditions which result in minimal shrinkage based on the surface tension, viscosity, concentration, molar volume, and temperature of the components of the system.

Abstract: Apparatus for enlarging the analytical capability of a photometric analyzer for segregating a first preselected analytical radiation wavelength band for passage through a first sample cell and segregating a second preselected analytical radiation wavelength band for passage through a second sample cell, after which emergent radiations from both sample cells are directed to a common radiation detector.

Abstract: A polyether urethane polymer which is the reaction product of(a) a difunctional copolymer of tetrahydrofuran and ethylene oxide or propylene oxide;(b) an organic diisocyanate; and(c) an aliphatic diol of 2 to 10 carbon atoms;Useful as an elastomer.

Abstract: Novel N-(1,2,4-triazin-3-ylaminocarbonyl) arylsulfonamides, such as N-[(5,6-dimethyl-1,2,4-triazin-3-yl)aminocarbonyl]benzene sulfonamide, are useful for regulating the growth of plants.

Abstract: A mounting arrangement for mounting a dozer blade on a vehicle so that it is capable of being tilted, angled, and raised and lowered is disclosed herein. The mounting structure includes a member that is adapted to be attached to the vehicle and defines a vertical pivot axis which supports a bracket that is pivoted through a fluid ram attached to the bracket and the vehicle. The bracket supports a pair of arms that are connected thereto through universal connections which are located on a common horizontal axis and the blade is attached to the opposite ends of the arms through further universal connections so that the blade can be raised and lowered by a lift fluid ram interposed between the bracket and the blade. A rigid link is connected to one of the arms and to the blade above the connection for the arm while the second arm has a single tilt fluid ram connected thereto and to the blade so that extension and retraction of the tilt fluid ram will tilt the lower edge of the blade.

Abstract: This invention relates to novel compounds of the formulae and their use as herbicides: ##STR1## wherein X is H, F, Cl, Br, CN, NO.sub.2 or OCH.sub.3 ;Y is H, F, or CH.sub.3 ; andZ is H, F, Cl, Br or OCH.sub.3 provided that(1) when Y is CH.sub.3 ; X is F, Cl, or Br;(2) when Z is 6--Cl or 6--Br, Y is F; and,(3) X, Y and Z may not all be H simultaneously.

Abstract: A modification to a reel type staple cutter wherein a hollow drive shaft for the reel communicates with internal passageways in the top plate of the cutter reel. Holes are formed through the top plate at locations between adjacent cutter blade assemblies. Air fed through the shaft is continuously jetted through the holes against advancing wads of cut staple to strip off staple.

Abstract: An improved thermosetting acrylic enamel containing a film-forming polymer blend of(1) an acrylic polymer containing reactive carboxyl and hydroxyl groups,(2) cellulose acetate butyrate having a 1-6 second viscosity, and(3) a melamine formaldehyde resin at least partially alkylated with an aliphatic monohydric alcohol;The improvement used in combination with the above comprises 0.1-5% by weight, based on the weight of the polymer blend, of iron pyrophosphate powder; this enamel forms a high quality finish on automobiles and trucks and the iron pyrophosphate provides improved gloss retention, and improved blister and darkening resistance under high temperature and humidity conditions.

Abstract: A method of plasma multiarc welding by permanently burning direct-current arcs of different polarities makes use of a plasma forming gas and shielding mediums and the arcs are located so that the adjacent arcs have opposite polarities, consisting, according to the invention, in that all arcs are started between nonconsumable electrodes and a workpiece or some arcs are started between nonconsumable electrodes and a workpiece and other arcs are started between consumable electrodes and a workpiece, the currents of all arcs and the distance between the arcs being set so that the ratio of the product of the currents of two adjacent arcs to the distance therebetween is equal or more than 6.10.sup.3 A.sup.2 /cm.

Abstract: A control mechanism for adjusting the angle and lateral position of a plow blade, which is particularly useful for laying cable, pipe and the like underground. The disclosed control mechanism includes a fixed frame, which is supported on a suitable vehicle and a slide frame, which supports the plow blade. The slide frame is slideably supported on a horizontal rail of the fixed frame. A piston or other power means is connected to the fixed and slide frames to adjust the lateral position of the supported plow blade. The disclosed plow includes a support frame which is pivotally mounted on a vertical pivot on a slide frame and the control mechanism includes means to angularly adjust the blade on the pivot.

Abstract: Compositions consisting essentially of a (i) resin mixture containing a low molecular weight polyvinyl alcohol and a medium molecular weight polyvinyl alcohol, and optionally, a copolymer of vinyl alcohol and an ethylenically unsaturated ester and (ii) as a plasticizer a polyethylene glycol, which compositions can be used for preparing films by melt extrusion or aqueous casting. These films are suitable for use as packaging film in automatic packaging equipment. They can be used to package pulverulent materials, and the film package containing the pulverulent material can be charged directly to water in which the film will dissolve, thus eliminating the problem of user contact and exact measuring of the package contents, as well as disposal of containers in which the pulverulent materials would otherwise be packaged. Moreover, these films provide enhanced resistance to breakage of packages made therefrom when such packages are handled or shipped, even under cold or dry conditions.

Abstract: A zero twist, staple fiber yarn of good strength, outstanding cleanness and good uniformity is produced from continuous filaments by a direct spinning process followed by entangling to a pin count of less than 50 millimeters. Filaments of less than 70 percent break elongation are stretch broken to fibers having an average length of 18 to 60 centimeters with at least 5 percent short fibers, at least 1.5 percent long fibers, and 50 to 93.5 percent fibers of lengths between 12.7 and 76 centimeters.

Abstract: A straddle carrier including a spreader in a bay that is raised and lowered by two fluid rams cooperating with opposite ends of the spreader is disclosed herein. The hydraulic circuit supplying fluid to the fluid rams includes a valve that prevents flow of hydralic fluid from the rams when the conduits leading to the rams are not pressurized but also includes an electrically actuated valve that allows the spreader to be lowered without hydraulic power.