Addition-curable self-adhesive silicone rubber composition and silicone rubber cured product

An addition-curable self-adhesive silicone rubber composition comprising:

• (A) 100 parts by weight of an alkenyl group-containing organopolysiloxane having at least two silicon-bonded alkenyl groups per molecule;
• (B-1) 0.05 to 10 parts by weight of an organosilicon compound of from 1 to 100 silicon atoms having at least one phenylene skeleton and at least one silicon-bonded hydrogen atom per molecule;
• (B-2) 0.2 to 30 parts by weight of an organohydrogenpolysiloxane that has at least two silicon-bonded hydrogen atoms per molecule and is free of aromatic groups, such that the number of moles of silicon-bonded hydrogen groups (Si—H groups) in, respectively, component (B-1) and component (B-2) relative to the total number of moles of silicon-bonded hydrogen atoms (total Si—H groups) in components (B-1) and (B-2) satisfies the condition [Si—H groups (B-1)]/[total Si—H groups]=1 to 50 mol % and [Si—H groups (B-2)]/[total Si—H groups]=50 to 99 mol %;
• (C) a platinum-based catalyst in an amount, expressed in terms of the weight of platinum metal with respect to the total weight of components (A), (B-1) and (B-2), that is from 0.5 to 500 ppm;
• (D) a benzotriazole derivative of the general formula (I) below:
• wherein R1 is a hydrogen atom or a monovalent hydrocarbon group of 1 to 6 carbon atoms, R2 is a monovalent hydrocarbon group of 1 to 15 carbon atoms or a group of the formula (I′) below:
• wherein R3 is —(CH2)a—Si(OR4)3, R4 is an alkyl group of 1 to 4 carbon atoms or a SiR53 group (R5 being an alkyl group of 1 to 4 carbon atoms), a is an integer from 1 to 6, and * represents a site available for bonding,
• in an amount of 2 to 100 moles per mole of platinum atoms in component (C);
• and
• (E) an acetylene alcohol compound or a compound obtained by modifying the alcoholic hydroxyl group thereon with a silane or siloxane, in an amount of 1 to 500 moles of acetylene per mole of platinum atoms in component (C).