Silicone resin sheet, producing method thereof, encapsulating sheet, and light emitting diode device

A silicone resin sheet comprising:

• a first layer formed by reacting a first silicone resin composition which contains a first organopolysiloxane having at least two alkenylsilyl groups in one molecule and a second organopolysiloxane having at least two hydrosilyl groups in one molecule so as to have a conversion ratio of 5 to 40% and
• a second layer laminated on at least one surface in a thickness direction of the first layer and formed from a second silicone resin composition which contains a third organopolysiloxane having at least two alkenylsilyl groups in one molecule, a fourth organopolysiloxane having at least two hydrosilyl groups in one molecule, a hydrosilylation catalyst, and a curing retardant containing tetralkylammonium hydroxide.

An encapsulating sheet made of a silicone resin sheet, wherein

• the silicone resin sheet comprises:
• a first layer formed by reacting a first silicone resin composition which contains a first organopolysiloxane having at least two alkenylsilyl groups in one molecule and a second organopolysiloxane having at least two hydrosilyl groups in one molecule so as to have a conversion ratio of 5 to 40% and
• a second layer laminated on at least one surface in a thickness direction of the first layer and formed from a second silicone resin composition which contains a third organopolysiloxane having at least two alkenylsilyl groups in one molecule, a fourth organopolysiloxane having at least two hydrosilyl groups in one molecule, a hydrosilylation catalyst, and a curing retardant containing tetralkylammonium hydroxide.