Light stabilizing liquid matter containing 2- (2-hydroxy-3-alpha-cumyl-5-tert-octylphenyl) -2h-benzotriazole

A light stabilizing liquid matter that can be added to a composition to be stabilized and that has a storage stability high enough for storage before being added to the composition, comprising:

• a product formed by mixing (A) 2-(2-hydroxy-3-α-cumyl-5-tert-octylphenyl)-2H-benzotriazole with
• (B) at least one benzotriazole compound other than 2-(2-hydroxy-3-α-cumyl-5-tert-octylphenyl)-2H-benzotriazole plus a hindered amine compound, or with
• (B′) at least one compound selected from the group consisting of a benzotriazole compound other than 2-(2-hydroxy-3-α-cumyl-5-tert-octylphenyl)-2H-benzotriazole, and a hindered amine compound, and
• (C) an anti-oxidant including at least one compound selected from the group consisting of a phosphite compound and a phenolic compound,
• wherein the sum of the components A and B, or the components A, B′ and C is in an amount more than 90 wt % based on a total weight of the light stabilizing liquid matter.