Patent ID: 11945970
Assignee: SHIN-ETSU CHEMICAL CO., LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A water repellent composition comprising
(A) a component that is a condensation reaction product between:
(a) an organopolysiloxane shown by the following general formula (1) and having a hydroxyl group or an alkoxy group at both terminals of a molecular chain of the organopolysiloxane,

(R2O)R12SiO—(R12SiO)m—SiR12(OR2)  (1)

wherein R1 represents an unsubstituted or substituted monovalent hydrocarbon group having 1 to 10 carbon atoms, R2 represents a hydrogen atom or R1, and “m” represents an integer of 5≤m≤2,500; and
(b) a trialkylsiloxysilicate containing an R13SiO1/2 unit, an SiO2 unit, and a siloxane unit having a hydroxyl group bonded to a silicon atom, wherein R1 is as defined above, a molar ratio of the R13SiO1/2 unit/the SiO2 unit is 0.6 to 1.3, and a content of the hydroxyl group is 0.1 or more and less than 2.0 mass %, and (B) a component that is an organopolysiloxane shown by the following general formula (2),

R13SiO—(R12SiO)n—SiR13  (2), wherein R1 is as defined above, and “n” represents an integer of 5≤n≤1,000.