SUSPENSIONS OF SILICATE SHELL MICROCAPSULES

摘要

Aqueous suspensions of silicate shell microcapsules having a volume fraction of microcapsules of at least 30 % that are gel free at 50 °C for at least one month and processes for obtaining them are disclosed. A process for improving the stability of an aqueous suspension of silicate shell microcapsules is disclosed which involves reducing non-volatile solid content of the continuous phase of the aqueous suspension of the silicate shell microcapsules to less than 0.3 weight percent. A process is also disclosed for improving the stability of an aqueous suspension of silicate shell microcapsules by adding a colloidal silicate sequestering agent to an aqueous suspension of silicate shell microcapsules and colloidal silicate particles.