PROBLEM TO BE SOLVED: To provide an addition curable liquid silicone rubber composition excellent in storage stability and capable of providing a silicone rubber (cured article) with low hardness by curing even when a silicone raw rubber component is added to a liquid silicone rubber composition containing organopolysiloxane, which is a liquid at room temperature, as a main agent.SOLUTION: There is provided a method for improving storage stability of an addition curable liquid silicone rubber composition by combining organopolysiloxane which contains two or more silicon atom binding alkenyl group and is a liquid at room temperature, a linear organopolysiloxane which has specific terminal group sealing percentage and specific weight average molecular weight and has a raw rubber shape at room temperature and a reinforced silica (fumed silica), to make viscosity of a silicone rubber mixture obtained by mixing the above described components at shear rate of 0.9 s-1 at 23°C during storage at 105°C for 3 days at 1.5 times or less of viscosity at 23°C and shear rate of 0.9 s-1 just after manufacturing.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】室温で液状のオルガノポリシロキサンを主剤とする液状シリコーンゴム組成物にシリコーン生ゴム成分を添加した場合でも、保存安定性に優れ、硬化して低硬度のシリコーンゴム(硬化物)を与えることが可能な付加硬化型液状シリコーンゴム組成物を提供する。【解決手段】ケイ素原子結合アルケニル基を2個以上含有する室温で液状のオルガノポリシロキサンと、特定の末端基封鎖率と特定の重量平均分子量とを有する室温で生ゴム状である直鎖状オルガノポリシロキサンと、補強性シリカ(ヒュームドシリカ)を組み合わせた付加硬化型液状シリコーンゴム組成物であって、上記各成分を混合したシリコーンゴム混合物の、105℃で3日間保管時の23℃でせん断速度0.9s-1における粘度を、製造直後の23℃でせん断速度0.9s-1における粘度の1.5倍以下とする付加硬化型液状シリコーンゴム組成物の保存安定性を改善する方法。【選択図】なし
