| 摘要 |
A polymer additive for alkaline zinc and zinc alloy electrodepositing media and processes comprises the reaction product of one or both of (i) a first di-tertiary amine of formula (1) where R' represents (a) or (b), and q is 2 to 6, R represents CH3 or C2H5 and each R may be the same or different and m is 2 to 4, and a second di-tertiary amine of formula (2) where B is CgH2g+1 and g = 0 or an integer, the respective B groups being the same or different, and f = 0 or an integer, and R'' represents CH3 or C2H5 and each R'' may be the same or different, with (ii) a di-halo alkane of the formula (4): A - (CH2)n - A, where A represents a halogen atom and n is at least 2. The resulting polymer preferably has general structure (I) where 0 </= x </= 1, 0 </= y </= 1 and: either (x or y) or (x and y) = 1, z is at least 2 and when y=0, n is at least 3.
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