(a2) polysiloxanes modified with polyesters represented by the formula (IV): wherein R7, R8 and R9 are ???(???CH2???)q??? and may be the same or different; R10 is ???OH, ???COOH, ???CH=CH2, ???CH(CH3)???CH2 or ???(???CH2???)r???CH3; R11 is ???(???CH2???)s???CH3; n and q are an integer of 1 to 15; r and s are an integer of 0 to 15; e??? is an integer of 1 to 50; and f??? is an integer of 1 to 300;