95 results about "Centistokes" patented technology

A medical article is provided including a chamber formed from a cyclic polyolefin having an inner surface in sliding engagement with an exterior surface of a sealing member, the inner surface of the chamber being coated with a composition including a first mixture of organopolysiloxanes having different molecular weights and a viscosity ranging from about 5,000 centistokes to about 100,000 centistokes; and a sealing member having an exterior surface coated with a second mixture of organopolysiloxanes having different molecular weights and having a viscosity ranging from about 10,000 centistokes to about 500,000 centistokes, the coatings being adhered to the surfaces by crosslinking induced by irradiation with an isotope, electron beam, or ultraviolet radiation.

A composition for simultaneously cleaning and waxing non-porous surfaces without the need for additional rinsing of the treated surface with water, has a pH of from about 6 to about 7 and contains by weight: (a) from about 0.04 to about 0.12% of an acrylic-based polymer, wherein the acrylic-based polymer is a hydrophobically modified, crosslinked polyacrylate powder which has been crosslinked with a polyalkenyl polyether or is an acrylic polymer containing acid groups and which dissolves and swells immediately when neutralized with an alkali salt (b) from about 0.5 to about 5.0% of a silicone blend composed of: (i) from about 70 to about 95% of a first polydiorganosiloxane fluid having a viscosity of from about 0.65 to about 60,000 centistokes at 25° C., and (ii) from about 5 to about 30% of a polydiorganosiloxane fluid mixture having a viscosity of from about 500 to about 2000 centistokes at 25° C., the polydiorganosiloxane fluid mixture being composed of a second polydiorganosiloxane fluid and a silicone resin; (c) wax; and (d) water. The composition can be used to simultaneously clean and wax non-porous surfaces such as the exterior surfaces of automobiles and other vehicles, windows, and the like.

A process for in-situ upgrading of a heavy hydrocarbon includes positioning a well in a reservoir containing a heavy hydrocarbon having an initial API gravity no greater than about 20, an n-heptane asphaltene content at least about 1 wt. %, and a viscosity at 35° C. greater than about 350 centistokes; injecting hydrocarbon solvent(s) and asphaltene precipitant additive(s) into the well at a ratio by volume of the solvent to the heavy hydrocarbon of about 0.1:1 to about 20:1 under reservoir conditions so as to provide an upgraded hydrocarbon in the reservoir having an improved API gravity, a reduced asphaltene content, and a lower viscosity; and producing the upgraded hydrocarbon from the well. The process of the present invention can be also carried out at higher temperatures such as by injecting steam with the one or more hydrocarbon solvents and the one or more asphaltene precipitant additives into the well.