Abstract:
Oximinosilane terminated polymers which are cured at room temperature to become stable elastomers. The polymers have hydrolyzable ketoximino silyl group at each end of each molecule and are prepared by reacting a hydroxyl-terminated liquid polymer with an organic diisocyanate to produce an isocyanate terminated prepolymer. The resulting prepolymer is then converted into a mercaptan terminated polymer either by reacting with a mercapto alcohol or by reacting with an olefinic alkylene alcohol or amine to give an olefin-terminated polymer which is then reacted with a dimercaptan. When the mercaptan terminated polymer is reacted with a vinyl oximino silane or a vinylalkoxyoximino silane, a silane terminated liquid polymer is obtained. Such polymers have improved elongation, moisture resistance, tensile and tear strength properties in adhesive, coating and sealant formulations.
Abstract:
A process for the reduction of methylbenzofuran (MBF) impurities in phenol obtained from the decomposition product of cumene hydroperoxide requires treating the phenol to reduce the level of acetol, contacting the phenol containing a low level of acetol with an acid resin at sufficient temperature and residence time to reduce the level of MBF by conversion to higher boiling compounds, then distilling the phenol to separate phenol from higher boiling compounds. The phenol may be treated in known ways, such as by treatment with an amine, to reduce the level of acetol. The phenol containing a low level of acetol is contacted with a strong acid resin to reduce the level of MBF.
Abstract:
A silicon nitride sintered body has a composition consisting essentially of from 75 to 96 wt.% of silicon nitride; yttrium oxide present in an amount ranging from about 2 to 10 wt.%; at least one oxide of the Lanthanide (Ln) element, wherein the molar ratio of Ln to Y is smaller than 1; strontium oxide present in an amount wherein the molar ratio of Sr to the sum of Y and Ln is between 0.1 and 0.5; and 0.2 to 5 wt.% of silicon carbide. Such a ceramic has high strength, high toughness and long-term durability, and is especially suited for industrial applications such as components for gas turbine and automotive engines.
Abstract:
A radar system includes a stabilization calibration arrangement wherein a module stores particular parameters for relating the radar system to a gyro which provides stabilizing data for the radar system. The storage module, the radar system and the gyro are mounted on the same mounting platform so that the particular calibration features remain with the mounting platform. With the arrangement described, the radar system is independent of the gyro and can be of a generic configuration as is advantageous for stabilization calibration purposes.
Abstract:
A process for the preparation of one or more of CHClFCF3 (HCFC-124), CHF2CClF2 (HCFC-124a) and CHF2CF3 (HFC-125) by reaction of perchloroethylene with hydrogen fluoride in a single stage reaction vessel in the presence of a fluorination catalyst. These compounds are useful in a variety of industrial applications including blowing agents, refrigerants, sterilant gases and solvent applications. Distilling the reaction product produces a distillate comprising HCl, CHClFCF3, CHF2CClF2 and CHF2CF3 and a minor amount of HF which distillate is scrubbed to remove the acids. The bottoms product comprises perchloroethylene, hydrogen fluoride and organic by-products which is phase separated to sequester the hydrogen fluoride from the mixture of perchloroethylene and organic by-products. The hydrogen fluoride and mixture of perchloroethylene with organic by-products are then preferably re-mixed at a controlled rate and recycled to the reaction vessel.
Abstract:
An optical diffuser plate (14) disposed between a flashlamp (13) and a solid state laser within a solid state laser (10) pump chamber (8). The optical diffuser plate acts as a homogenizer of the pump light to reduce pumping inhomogeneities inherent with specular reflectors, while at the same time providing an efficient energy transfer from the flashlamp to the solid state laser. The optical diffuser plate can also filter out pump light below critical wavelengths that can be detrimental to the solid state laser.
Abstract:
A floating bearing (148) having an oval body (72) located in a cavity (14) along with a fixed bearing (50) retains a pair of intermeshing gear members (40) in the cavity in a housing (12) of a pump. A spacer member (88) engages an axial rib (84) on the oval body to form a control chamber between the spacer member and the oval body. A resilient member (107) provides an initial force which urges the floating bearing into engagement with the pair of intermeshing gears and forms a gap between the spacer and the oval body. Entrance fluid pressure from an entrance chamber is communicated to the control chamber while discharge fluid pressure from a discharge chamber is communicated to the gap. The entrance and discharge fluid pressures act on the floating bearing to provide a secondary force which urges the floating bearing into engagement with the pair of intermeshing gears to seal the entrance chamber from the discharge chamber.
Abstract:
A web guide (20) having a load absorbing core (30), a hinge and an integral cover (170). The core is covered by a synthetic resin that also forms the integral cover and hinge. The cover is locked into place by tabs integrally formed by the coating material.
Abstract:
The ultrasonic hydraulic booster pump (10, 150) comprises a backing plate housing (11) defining a cavity (14) closed at one end (13) by an end cap (18), the end cap (18) having an inlet port (20) and the backing plate housing (11) having an outlet port (16). A diaphragm (30) having a plurality of openings (33) is mounted between the end cap (18) and a spacer member (35) located within the cavity. A plurality of annular shaped piezoelectric rings or discs (60) are located within a ring housing (40) disposed within the spacer member (35). A plug member (50) with a through opening (52) extends through a central through opening (44) in the ring housing (40) and includes a valve seat (58) disposed closely adjacent a solid central portion (34) of the diaphragm (30), and the end cap (18) includes a valve seat (22) disposed closely adjacent the opposite side of the diaphragm (30). An alternating voltage applied to the piezoelectric rings (60) causes excitation thereof and resonance of the diaphragm (30) so that hydraulic fluid is pumped from the inlet port (20) and out the outlet port (16). The ultrasonic hydraulic booster pump (150) provides increased or boost pressure in a hydraulic braking system (100).
Abstract:
A fluid pressure control apparatus having a main valve and a pilot valve for moving the main valve to a shutoff position as a function of the fluid pressure in a supply fluid. The pilot valve is connected to receive supply fluid having a fluid pressure Ps through a first passage. A second passage connected to the first passage communicates supply fluid to a control chamber in the main valve. A first restriction in the second passage limits the fluid pressure of the supply fluid communicated to the control chamber to a fluid pressure Pc. The control chamber is connected to a reservoir having a fluid pressure Pr through a third passage having a second restriction therein to control the flow of fluid from the control chamber. A first piston located in the main valve is responsive to a pressure differential between the fluid in the control chamber and supply fluid presented to an outlet chamber to control the flow of supply fluid as a fluid pressure Po to a system from the main valve. In response to an operational input signal supplied to a solenoid associated with the pilot valve, a second piston moves to initiate communication of supply fluid having a fluid pressure Ps from the first passage directly to the control chamber in the main valve. As the fluid pressure in the control chamber changes form Pc to Ps, the pressure differential is eliminated and the first piston closes as a force differential is reversed to immediately terminate the flow of supply fluid to the system.