Abstract: A method for the regeneration of spent pickling acids. Said acid is mixed with such a minor quantity of a stronger acid that the losses of said stronger acid are compensated. The mixture obtained is stripped, whereby the weaker acids are vaporized. The vapor phase containing the weaker acids is passed to a condenser. The condensate obtained forms the regenerated pickling acid. The spent pickling acid can also be passed directly to an evaporator in which a solution containing a stronger acid is circulated. The vapor from the evaporator is passed to an absorption column and thereafter to a condenser, the regenerated acid being formed of the condensate from said condenser.

Abstract: Products of a coprecipitation process comprising (i) substantially clear serum and (ii) homogeneous, essentially non-tacky, dustless, friable particles of predispersed rubber or plastic compounding chemical which comprise from about 80 to about 99.5 percent by weight of said chemical and from about 0.5 to about 20 percent by weight of a film-forming binder comprising a rubber or plastic polymer, wherein substantially all of the particles of the compounding chemical are at least 0.05 micron in size and no compounding chemical used is a reinforcing agent or diluent for rubber or plastic stock, are formed associatively.

Abstract: A composition of matter useful for dispersing a critical chemical in a rubber or plastic compound, said composition comprising from about 60 to about 95 percent by weight of a critical chemical and from about 5 to about 40 percent by weight of a binder, said binder comprising at least one component selected from (i) liquids compatible with said rubber or plastic compound and with the other binder components and (ii) waxes having a sharp melting point in the range of 55.degree.-80.degree. C, and a polymer having a molecular weight of at least about 50,000 which when combined with the other binder components produces a binder which is a non-tacky gel below about 53.degree. C. The composition can additionally comprise a fine powder reinforcing agent, which can also serve as a stabilizer for the binder.

Abstract: A rubber composition comprising a highly unsaturated rubber, a magnesium compound capable of donating electrons and a carboxylated cobalt oxy metal complex comprising at least one metal atom selected from Groups IIIA, IIIB, IVA, IVB, VA and VB of the Periodic Table, at least one cobalt atom, said metal and cobalt atoms being linked through oxygen atoms, at least one acyloxy radical attached to a cobalt atom, and any residual valences of said complex being satisfied by acyloxy, aryloxy or alkoxy radicals.