Suspensions of silicate shell microcapsules for temperature controlled release

摘要

Aqueous suspensions of silicate shell microcapsules are disclosed having a core containing a burst aid wherein the silicate shell microcapsules are obtained by; I) mixing an oil phase containing a burst aid and an aqueous solution of a cationic surfactant to form an oil in water emulsion, II) adding a water reactive silicon compound comprising a tetraalkoxysilane to the oil in water emulsion, III) polymerizing the tetraalkoxysilane at the oil/water interface of the emulsion to form a microcapsule having a core containing the oil and a silicate shell.

主权项

1. An aqueous suspension of silicate shell microcapsules, wherein the suspension contains:
microcapsules containing an oil phase and a burst aid that is a volatile hydrophobic hydrocarbon between 0.2 and 20 weight % of the oil phase, and having a silicate shell formed by polymerizing a water reactive silicon compound comprising a tetraalkoxysilane; and a water phase containing an aqueous solution of a cationic surfactant to form an oil in water emulsion, wherein the density of the oil phase and the density of the water phase of the oil in water emulsion are within 2% of each other; wherein the microcapsules are configured such that the silicate shells rupture at a trigger temperature from 40° C. to 100° C. via volatilization of the burst aid.