Patent ID: 8063135

Claim:
A water-based polymer composition, comprising: particles of at least one halogenated polymer (P) in an amount of from 5 to 50% by weight based on the total weight of the composition, wherein the halogenated polymer (P) is a fluoropolymer consisting of recurring units derived from a fluorinated monomer and at least one hydrogenated comonomer; at least one aromatic polyamic acid (A) comprising recurring units (R2), wherein more than 50% mol of said recurring units (R2) comprise at least one aromatic ring and at least one of an amic acid group and an imide group, further wherein: in more than 50% mol of said recurring units (R2) comprising at least one amic acid group, part or all of the amic acid groups are neutralized by at least one basic compound (B), wherein the aromatic polyamic acid (A) has an acid number of at least 100 mgKOH/gram and is present in an amount of 0.5 to 12% by weight based on the total weight of the composition; water; and optionally, at least one organic solvent (S) wherein the total amount of the organic solvent is less than 20% by weight with respect to the weight of the aromatic polyamic acid.