The present invention relates to a two-component sealant comprising a first part and a second part whereina) the first part comprises: a polyalkyleneoxide polymer having one or more unsaturated end groups an addition reaction catalystb) the second part comprises: an organosiloxane comprising one or more Si\u2014H groups. The corner area defines a nose angle in the range of 30-85\xb0. The heat spreader includes indented parts to expose the signal contact pads and protruded parts to cover the ground contact pads which are exposed through holes formed on the protruded parts on the peripheral part of the heat spreader. In this case, even if printing is instructed during the electric charge, printing is started after completion of the electric charge.