Aqueous latices of high polymer compositions and process and means for the production thereof

Abstract

The preparation of aqueous latices from solvent dispersions of elastomers and other high polymer compositions has presented problems including 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; enable preparation of latices of filler extended and filler reinforced elastomers; and enable the preparation of latices both dilute and of high solids content, which are useful for example for adhesive and film forming purposes. The process is particularly 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 emulsifier combinations. New combinations of apparatus are also disclosed and claimed for performing the steps of the process. The process disclosed is applicable to the production of latices from specified rubbery and non-rubbery polymers, which may contain reinforcing filler, and certain of such latices are new and useful products also claimed herein.

Dependencies are inferred from the claim text.