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    • 7. 发明授权
    • Improved process for converting aqueous emulsion into aerosol of latex of polymer in aqueous/solvent vapor phase
    • US3892703A
    • 1975-07-01
    • US17746672
    • 1972-09-02
    • EXXON RESEARCH ENGINEERING CO
    • BURKE JR OLIVER W
    • B01F3/04B01F5/00B01F5/04B01F17/00C08J3/03C08F45/24
    • B01F5/045B01F3/04099B01F5/0471B01F5/049B01F17/0085B01F2005/0051B01F2215/0049C08J3/03
    • The preparation of aqueous latices from solvent dispersions of elastomers and other high polymer compositions has presented problems including excessive viscosity during processing and foaming and coagulation, which have produced losses and increased costs. Herein combinations of steps are disclosed which reduce or eliminate various of these problems; enable the preparation of latices from high solids, high viscosity cements as well as from high solids cements of low molecular weight polymer; enable preparation of latices of grafted or filler extended or filler reinforced elastomers; enable preparation of latices of low molecular weight polymer which are then modified to materially increase the molecular weight of the polymer and/or the latex particle size; and enable the preparation of improved latices both dilute and of high solids contents, which are useful for example for adhesive and film forming purposes. The process in common with that of related copending applications is characterized, inter alia, by the establishment of a flow of latex through the separating zone and the impingement on said flow of the coalesced latex droplets from the solvent vapor stream in which they are delivered to the separator, and in certain embodiments by the use of particular additive materials. New combinations of steps and of apparatus for performing the same are also disclosed and claimed. The part of the process described and claimed herein converts an aqueous emulsion of solvent/polymer solution droplets of precursor latex particle size, into the form of an aerosol of latex of the polymer in an aqueous solvent vapor phase, by dispersing at a first station the aqueous emulsion into a flow of steam for effecting partial vaporization of the solvent therefrom, and then at one or more stations downstream from said first station adding further steam peripherally to the flow for effecting vaporization of the remainder of the solvent from the dispersed emulsion into the solvent vapor flow while maintaining the stability of the aqueous emulsion during such stripping of solvent. The process disclosed is applicable to the production of latices from specified rubbery and non-rubbery polymer compositions, and certain of such latices are new and useful products also claimed herein.
    • 8. 发明授权
    • Method of treating aqueous emulsion of solvent/polymer solution of precursor latex particle size to form latex
    • US3892701A
    • 1975-07-01
    • US17746471
    • 1971-09-02
    • EXXON RESEARCH ENGINEERING CO
    • BURKE JR OLIVER W
    • B01F3/04B01F5/00B01F5/04B01F17/00C08J3/03C08F45/24
    • B01F5/045B01F3/04099B01F5/0471B01F5/049B01F17/0085B01F2005/0051B01F2215/0049C08J3/03
    • The preparation of aqueous latices from solvent dispersions of elastomers and other high polymer compositions has presented problems including excessive viscosity during processing and foaming and coagulation, which have produced losses and increased costs. Herein combinations of steps are disclosed which reduce or eliminate various of these problems; enable the preparation of latices from high solids, high viscosity cements as well as from high solids cements of low molecular weight polymer; enable preparation of latices of grafted or filler extended or filler reinforced elastomers; enable preparation of latices of low molecular weight polymer which are then modified to materially increase the molecular weight of the polymer and/or the latex particle size; and enable the preparation of improved latices both dilute and of high solids contents, which are useful for example for adhesive and film forming purposes. The process in common with that of related copending applications is characterized, inter alia, by the establishment of a flow of latex through the separating zone and the impingement on said flow of the coalesced latex droplets from the solvent vapor stream in which they are delivered to the separator, and in certain embodiments by the use of particular additive materials. New combinations of steps and of apparatus for performing the same are also disclosed and claimed. The method described and claimed herein relates to the treating of an aqueous emulsion of solvent/polymer solution to form a latex and then treating the latex while containing residual solvent to modify the same to materially increase the molecular weight of the polymer and/or the latex particle size. The process disclosed is applicable to the production of latices from specified rubbery and non-rubbery polymer compositions, and certain of such latices are new and useful products also claimed herein.