Phillips Petroleum Company

Roy A Gray

Yulin Wu

Gary D Macdonell

Timothy P Murtha

Macdonell, Gary D

A composition which forms a corrosion-inhibiting film when applied to a metal surface. The composition comprises a low molecular weight polyfunctional polymer formed by polymerizing a vinyl monomer in the presence of a mercaptan chain transfer agent. In one embodiment, the composition comprises a low molecular weight polyfunctional polymer represented by the general formula: ##STR1## wherein M is a repeating vinyl monomer unit, n is from about 2 to about 40, x is from 0 to about 10, y is from 0 to 1, z is from 0 to 1 if y is 0 and 0 if y is 1 and R is hydrogen, an alkyl group, a hydroxy alkyl group or an alkoxy group. A method of treating a metal surface by contacting the metal surface with a composition that forms a corrosion-inhibiting film thereon is also provided. The composition and methods are useful for inhibiting corrosion of downhole metal surfaces present in oil and gas wells.

Compositions and methods for inhibiting corrosion

Dimercaptodihydroxy alkanes are used as a curing agent for epoxide resins and as ore flotation agents.

Mercaptohydroxy alkanes

Dimercaptodihydroxy alkanes, such as 1,10-dimercapto-2,9-dihydroxydecane, are used as a curing agent for epoxide resins and as ore flotation agents.

A refrigeration process is conducted by employing as the refrigerant a mixture of one or more hydrocarbons and one or more halocarbons. The boiling points of the components of the mixture are bracketed in such a manner that the flammability of the mixture is reduced.

Hydrocarbon-halocarbon refrigerant blends

Novel compounds having the formula ##EQU1## WHEREIN N IS AN INTEGER, 0 TO 3 AND Z is selected from bromine or ##EQU2## the proportion of the selected Br-- and RCO.sub.2 --being such that the weight percent Br in the compound will be in range 20 to 70, the R in the carboxylate group containing from 1 to 17 carbons and being selected from alkyl, cycloalkyl, aryl, and combinations thereof such as alkaryl and aralkyl, the R groups being the same or different. The now preferred compound 1,7-diacetoxy-2,2,6,6-tetra(bromomethyl)-4-oxaheptane (DATBOH) is prepared by reaction of dipentaerythritol, acetic anhydride and anhydrous hydrogen bromide at about 100.degree. C., extracting with a solvent, treating with an alkaline wash, and recovering the product as a viscous liquid. Alternately, the corresponding hexaacetate can be brominated using hydrogen bromide. The product compounds are useful as flame retardants, for example, for polymers, e.g. polyolefins, more particularly polypropylene. Antimony trioxide and other inorganic oxides and other compounds known in the art as improving the effect of a bromine-containing compound can be incorporated into the composition of the invention, to increase the flame retardant effect of the compound of the invention.

Flame retardants for polymers

A thermoplastic such as polypropylene is blended with flame retardant additives and subjected to elevated temperature such that it is degassed sufficiently to avoid formation of voids or cells in an object molded therewith.

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Bartlesville, OK, United States of America

Roy A Gray