Polyorganosiloxane compound and coating composition containing the same

A polyorganosiloxane compound which contains in the molecule a silicone oil structure and a silicone resin structure having at least one alkoxyl group and is compatible with a silicone resin, said polyorganosiloxane being obtained by allowing the following polyorganosiloxane (a1):

• (a1) a polyorganosiloxane represented by the average compositional formula (1):
• R1aR2bSi(OR3)cO(4−a−b−c)/2 (1)
• wherein R1 is at least one member selected from the group consisting of a substituted or unsubstituted alkyl group and a substituted or unsubstituted aryl group;
• R2 is a group containing an aliphatic unsaturated double bond;
• R3 is an alkyl group having 1 to 4 carbon atoms which may have an ether linkage;
• and a, b and c are numbers that satisfy the following relation:
• 0≦a<1.5, 0.01≦b≦1, 0.5≦a+b≦1.8, 0.01≦c≦2.5 and 1≦a+b+c≦3;
• and having at least one aliphatic unsaturated double bond in the molecule, to react with the following polyorganosiloxane (a2):
• (a2) a polyorganosiloxane represented by the general formula (2):
• wherein R1 is as defined in the above formula (1), and n is a number of from 0 to 1,000, in the presence of a hydrosilylation catalyst.