| abstract |
New resin-linear organo, which is highly compatible with other lipophilic raw materials, has a high degree of freedom in formulation design, has excellent film-forming properties and coating follow-up properties, and suppresses the stickiness of the coating. A polysiloxane block copolymer is provided. The resin-linear organopolysiloxane block copolymer is represented by R 1 SiO 3/2 (R 1 is a monovalent organic group, a hydroxyl group or an alkoxy group having 1 to 6 carbon atoms) and SiO 4/2 in the molecule. Resin structure (A1) block having a siloxane unit and a linear structure represented by (R 2 SiO 2/2 ) n (n is a number of 5 or more, R is an alkyl group, a fluoroalkyl group or an aryl group) (A2) block, the resin structure (A1) and the linear structure (A2) are connected by Si—O—Si bond, and the Si atom bonded to the resin structure (A1) is RSiO 3/2. Consists of units. |