| 摘要 |
<p>A dispersing agent comprises (a) a silylated polyether of formula (I) or an isocyanato silane of formula (II), and (b) a phosphate ester of formula (III). In the formulas, R1 is H, C1-12 alkyl, C2-12 alkoxyalkyl or C6-12 acyl; R2 is H, C1-18 alkyl or C6-18 aryl; R3 is H, C1-12 alkyl, C6-18 aryl or C7-18 arylalkyl; R4 is C1-4 alkyl; R5 is C1-18 alkylene, C1-18 arylene or C1-18 aralkylene; R6 is C1-4 alkyl; R7 is H, C1-12 alkyl, C2-12 alkoxyalkyl or C6-12 acyl; R8 is H or C1-20 alkyl; R9 is H, C1-4 alkyl, C6-18 aryl or C7-17 alkylaryl; x + y is 2-100; x is 1-3; w is 0-6; m is 1-3; a is 0-1; b is 0-3; c+d is 0-100; e is 1-2; A is H, Na, K or Li. The agent is used for dispersing ferromagnetic particles in the magnetic coating.</p> |
