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J Microencapsul. 2016 Dec;33(8):743-749. doi: 10.1080/02652048.2016.1260660. Epub 2016 Nov 28.

Treatment of high-latency microcapsules containing an aluminium complex with an epoxy-functionalised trialkoxysilane.

Author information

a Advanced Materials Development Department, Corporate Research & Development Division , Dexerials Corporation , Kanuma , Japan.
b Department of Innovation Systems Engineering, Graduate School of Engineering , Utsunomiya University , Utsunomiya , Japan.


Some aluminium complexes are excellent catalysts of cationic polymerisation and are used for low-temperature and fast-curing adhesive, used in electronic part mounting. Microencapsulation is a suitable technique for getting high latency of the catalysts and long shelf life of the adhesives. For the higher latency in a cycloaliphatic epoxy compound, the microcapsule surface which retained small amount of aluminium complex was coated with epoxy polymer and the effect was examined. From the X-ray photoelectron spectroscopic results, the surface was recognised to be sufficiently coated and the differential scanning calorimetric analyses showed that the coating did not significantly affect the low-temperature and fast-curing properties of adhesive. After storing the mixture of cycloaliphatic epoxy compound, coated microcapsules, triphenylsilanol and silane coupling agent for 48 h at room temperature, the increase in viscosity was only 0.01 Pa s, resulting in the excellent shelf life.


Aluminium complex; cure/hardening; epoxides; microcapsule; silane coupling agent

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