Curable organopolysiloxane composition and adhesive composition containing same

A curable organopolysiloxane composition, comprising:

• (A) 100 parts by mass of an organosiloxane component containing one or more (meth)acrylic groups selected from the following component (A1) to component (A3);
• (A1) a resin-linear structure-containing organopolysiloxane block copolymer having:
• a resinous organosiloxane block X having an acrylic group or methacrylic group and containing a siloxane unit (MRA unit) expressed by RAaRB(3-a)SiO1/2 where RA is a silicon atom-bonded functional group containing an acrylic or methacrylic group, RB is a monovalent organic group excluding RA, and a is a number in a range of 1 to 3,
• a siloxane unit (MAlk unit) expressed by RB′3SiO1/2 where RB′ is a monovalent organic group excluding RA and at least one RB′ is an alkenyl group) and a siloxane unit (Q unit) expressed by SiO4/2;
• and
• a chain organosiloxane block Y having a siloxane unit expressed by {RC2SiO2/2}β (where RC is a monovalent organic group and β is 2 or higher), and having at least one alkenyl group in each molecule;
• (A2) an organosiloxane mixture obtained by mixing the following components (A2-1) and (A2-2) at a mass ratio of 1/99 to 80/20;
• (A2-1) a resinous organopolysiloxane having an acrylic group or methacrylic group and containing a siloxane unit (MRA unit) expressed by RAaRB(3-a)SiO1/2 where RA is a silicon atom-bonded functional group containing an acrylic or methacrylic group, RB is a monovalent organic group excluding RA, and a is a number in a range of 1 to 3;
• a siloxane unit (MAlk unit) expressed by RB′3SiO1/2 where RB′ is a monovalent organic group excluding RA and at least one RB′ is an alkenyl group and a siloxane unit (Q unit) expressed by SiO4/2;
• (A2-2) a straight chain organopolysiloxane having two alkenyl groups in each molecule;
• (A3) an organosiloxane mixture obtained by mixing the following components (A3-1) to (A3-3);
• (A3-1) a resinous organosiloxane having an acrylic group or methacrylic group and containing a siloxane unit (MRA unit) expressed by RAaRB(3-a)SiO1/2 where RA is a silicon atom-bonded functional group containing an acrylic or methacrylic group, RB is a monovalent organic group excluding RA, and a is a number in a range 1 to 3, and siloxane units (Q units) expressed by SiO4/2;
• (A3-2) A resinous organopolysiloxane having an alkenyl group and containing a siloxane unit (MAlk unit) expressed by RB′3SiO1/2 where RB′ is a monovalent organic group other than RA, and at least one of RB′ is an alkenyl group, and a siloxane unit (Q unit) expressed by SiO4/2;
• (A3-3) a straight chain organopolysiloxane having two alkenyl groups in each molecule;
• (B) 1 to 50 parts by mass of a siloxane component not containing a carbon-carbon multiple bond in each molecule;
• and
• (C) 0.1 to 10 parts by mass of a photoradical polymerization initiator.