Preparation of microcapsules containing TMBA (1,3,5‐trimethylbarbituric acid) by the drying‐in‐liquid method and its application

Abstract

1,3,5-trimethylbarbituric acid (TMBA), an amphiphilic material used widely for redox catalysts, such as organic peroxide, aromatic tertiary amine, and anhydride, was microencapsulated by the drying-inliquid method with polyethylene methacrylate (PEMA) as a wall material. To prevent osmotically induced leakage of the core material into the continuous water phase during the microencapsulation process, TMBA was beforehand dissolved into the continuous water phase. In the experiment, the amount of TMBA dissolved and holdup of the dispersed oil phase were changed. The microencapsulation efficiency increased with the increase in the amount of TMBA dissolved but remained 36% at the highest even with the saturated level of TMBA. Also, the microencapsulation efficiency decreased with increase in holdup. The microcapsules containing TMBA were used for preparing a biological hard tissue-adhesive material and estimated for the microencapsulation effects. The adhesives containing the microencapsules were found to have excellent bonding properties and high storage stability.

Preparation of Composite Particles Made of Biodegradable Polymer and a Few Additives with Phase Separation Followed by Drying-in-Liquid

“…The purposes of this study are to investigate whether the biodegradable composite particles could be prepared by the phase separation method [16]- [18] followed by the drying-in-liquid method [1] [19] or not, to establish the optimum operational conditions for preparing the biodegradable composite particles, to characterize the composite particles prepared and to get the fundamental information for application to toner particles.…”

Preparation of Microcapsules Containing β-Carotene with Thermo Sensitive Curdlan by Utilizing Reverse Dispersion

“…Microcapsules have been applied in many fields such as cosmetics, information-recording materials, paintings, catalyst, food industry, medicine, agriculture, adhesives and so on [1,2,3,4,5,6]. The main purposes of microencapsulation are to protect the core material from environment, to enable controlled release the core material, to modify the surface of core material, to mask the taste of core material, and so on.…”