Curable hot-melt silicone composition, cured product thereof, and laminate including curable hot-melt silicone composition or cured product thereof

A curable silicone composition having hot-melt properties as a whole composition, comprising:

• (A) 100 mass parts of an organopolysiloxane resin containing the following component (A1) and component (A2) at a mass ratio of 20:80 to 90:10;
• (A1) an organopolysiloxane resin that is solid at 25° C., having a curing reactive functional group containing a carbon-carbon double bond in a molecule, containing a siloxane unit expressed by SiO4/2 making up at least 20 mol % of all siloxane units, and does not independently have hot-melt properties, and
• (A2) an organopolysiloxane resin that is solid at 25° C., not having a curing reactive functional group containing a carbon-carbon double bond in a molecule, containing a siloxane unit expressed by SiO4/2 making up at least 20 mol % of all siloxane units, and does not independently have hot-melt properties;
• (B) 10 to 100 mass parts of a straight-chain or branched organopolysiloxane that is liquid or has plasticity at 25° C., having a curing reactive functional group containing at least two carbon-carbon double bonds in a molecule;
• (C) an organohydrogenpolysiloxane resin having at least two silicon-bonded hydrogen atoms in a molecule, present in an amount where the number of hydrogen atoms bonded to a silicon atom per one alkenyl group bonded to a silicon atom included in the entire composition is 0.5 to 20.0;
• and
• (D) a hydrosilylation reaction catalyst that does not exhibit activity without irradiating with a high energy beam, but exhibits activity in the composition when a high energy beam is irradiated at an amount sufficient for curing the composition;
• wherein component (A) has a mass loss ratio of 2.0 mass % or less when exposed to 200° C. for one hour;
• and
• wherein component (C) is expressed by the following average compositional formula (2):
• (HR62SiO1/2)e(R62SiO2/2)f(SiO4/2)g (2)
• where R6 independently represents an unsubstituted or substituted monovalent hydrocarbon group that does not contain an aliphatic unsaturated bond with 1 to 12 carbon atoms, and e, f, and g represent numbers that satisfy conditions of 0.01≤e≤0.6, 0≤f≤0.9, 0.2≤g≤0.9, and e+f+g=1;
• or
• wherein component (C) is expressed by the following average compositional formula (3):
• (HR72SiO1/2)h(R72SiO2/2)i(R8SiO3/2)i (3)
• where R7 and R8 each independently represent an unsubstituted or substituted monovalent hydrocarbon group that does not contain an aliphatic unsaturated bond with 1 to 12 carbon atoms, at least 10 mol % of all Ros represent aryl groups, and h, 1, and j represent numbers that satisfy conditions of 0.01≤h≤0.6, 0≤i≤0.9, 0.2≤j≤0.9, and h+i+j=1.