An electrodeposition coating composition comprising a fluorine-containing copolymer having an anionic functional group, a curing agent and water, said copolymer comprising:
(a) 20 to 80 % by mole of the structural unit of the formula (l):
-CFX-CF₂- (l)
(b) 5 to 60 % by mole of the structural unit of the formula (2):
(c) 0 to 40 % by mole of the structural unit of the formula (3):
(d) 0 to 40 % by mole of the structural unit of the formula (4):
 the total amount of the structural units (a), (b), (c) and (d) being l00 % by mole. The composition of the invention can be baked to substrates at a low temperature in comparison with compositions containing conventional fluorine-containing copolymers, and the films obtained by electrodepositing the composition are excellent in gloss, weatherability, adhesion to the substrates, alkali resistance and smoothness.
                            一种电沉积涂层组合物,由具有阴离子官能团的含
氟共聚物、固化剂和
水组成,所述共聚物包括
(a) 20-80%(摩尔)的式(l)结构单元:
-CFX-CF₂- (l)
(b) 5%至 60%(以摩尔计)的式(2)结构单元:
(c) 以摩尔计,式(3)结构单元的含量为 0-40%:
(d) 式(4)结构单元的 0 至 40%(以摩尔计):
 结构单元(a)、(b)、(c)和(d)的总量为 l00 %(摩尔)。与含有传统含
氟共聚物的组合物相比,本发明的组合物可以在低温下烘烤到基材上,通过电沉积组合物获得的薄膜在光泽度、耐候性、与基材的粘附性、耐碱性和平滑性方面都非常出色。