High-Solids Synthetic Latex Directly from Reactor

Abstract

Until recently high-solids synthetic latices were made only by expensive and time-consuming concentration of dilute latex. It is now possible to produce stable, fluid latices of 55-60% total solids content directly in the reactor.

Synthetic Rubber Latex Developments

“…The attainment of high vulcanízate strength in cast latex sheets is usually tied in with the attainment of high wet gel strength under the conditions of use. Thus, high vulcanízate strengths on cast latex films of cold GR-S rubbers have been obtained in some cases (3,10), but they have often been found difficult to reproduce from one laboratory to the next. Also, widely variable results have been obtained by the same investigators on supposedly similar latices, as has been the experi-Because the use of cold rubber latices may be extended into the field of latex applications as 100% synthetic, rather than as an extender for natural rubber latex, a study was undertaken to evaluate the effect of several polymerization variables on the properties of blends containing 0 to 100% synthetic rubber.…”

“…Since some latex applications, such as foam sponge, require solids above 50%, products in this range were also developed (3), Some of the production latices (15,16) of this type which will be • briefly discussed are X-276 (Type V) (18), X-359 (Type VI) (7), X-370 (Type VII) (8), and X-270 (Type VIII) (16). The X numbers given are the original designations of experimental latices, which later became standardized into the types given in parentheses.…”

Latices of Flexible Synthetic Polymers

“…Particle diameters of synthetic latices can be varied over a wide range of size and distribution (34,188). For the most part, this is determined in the polymerization or dispersion process and is characteristic of each commercial material.…”