| 摘要 |
Silanes of the general formula (see fig. I) wherein R1, R2 and R3 in the molecule are the same or different and represent aliphatic hydrocarbon groups, R4 is a divalent hydrocarbon group with 3 to 14 carbon atoms, R5 is a group having the formula -O(CH2)b- or a polyether group having the formula -(OCnH2n)c-, wherein b has a value of 1 to 6, n has an average value of 2 to 2.5 c has a value of 1 to 10, and is 0 or 1, which fulfill the condition that they lower the surface tension of a 1% by weight aqueous solution to a value of ~ 25 mN/m at 25.degree.C, measured with a Du Noüy tensiometer. The silanes are biologically degradable, resistant to hydrolysis and have pronounced surface active properties.
|
