A binary latex system is described which meets several target criteria as a pressure sensitive adhesive on untreated polyester: improved humidity resistance (approx. 50% peel retention after seven days in a high humidity environment), good film clarity before and after humidity aging, no transfer failure mode and good cohe sive strength. A comparison is made to commercial acrylic latex material either fully formulated or as a binary system employing a new latex component as well. Superior performance is found with the new binary system in most performance areas.
In fact, a 1.61 sq cm (1/4 sq in) adhesive sample has exceeded 1000 hours with a 1 kg suspended weight. Along with this apparent synergism is an increase in thickening efficiency: 0.1 phl associative thickener is sufficient to achieve the desired latex viscosity.
3.
Hughes, L.J. and G.E. Britt.J. Appl. Polymer Sci., 5:337-348 (1961).
4.
This is not very likely, however, because of particle size range similarities of latices A and C.
