POLYMER WITH SALT GROUPS AND ANTIFOULING COATING COMPOSITION CONTAINING SAID POLYMER Russian patent published in 2013 - IPC C09D5/16 C08F220/06 C08F220/34 C08F220/60 C08F220/38 C08F220/28 

FIELD: chemistry.

SUBSTANCE: film-forming polymer has a salt suspended from its backbone, said salt being formed from (i) a basic group with a first pK_a of the conjugate acid of at least 4.0 and (ii) an organic acid with a first pK_a of 2.0 or less. Said basic group is covalently bonded to the polymer backbone and is trialkylamine, dialkylamine or a heterocyclic nitrogen base. The organic acid is a sulphonic acid containing an aliphatic, aromatic or aralkyl hydrocarbon group. The method of producing the polymer includes a step of polymerising monomers, wherein some of the monomers are monomer salts obtained from said acid and base. The antifouling composition contains the film-forming polymer and an ingredient having biocidal properties in seawater. Such a composition is used to protect structures immersed in water, such as ship hulls, buoys, drilling platforms, oil production rigs and pipes.

EFFECT: invention increases chemical stability of the composition during storage.