The present invention relates to a composition comprising: (i) an anti-
microbial agent comprising a polymeric
biguanide, alone or in combination with at least one other microbiologically
active component selected from the group consisting of
quaternary ammonium compounds, monoquaternary
heterocyclic amine salts,
urea derivatives, amino compounds,
imidazole derivatives,
nitrile compounds,
tin compounds or complexes, isothiazolin-3-ones,
thiazole derivatives, nitro compounds,
iodine compounds,
aldehyde release agents, thiones,
triazine derivatives,
oxazolidine and derivatives thereof,
furan and derivatives thereof, carboxylic acids and the salts and esters thereof,
phenol and derivatives thereof, sulphone derivatives, imides, thioamides, 2-mercapto-
pyridine-N-
oxide,
azole fungicides,
strobilurins, amides, carbamates,
pyridine derivatives, compounds with active
halogen groups, and organometallic compounds; and (ii) an amphoteric co-
polymer of the Formula (1): wherein:[A] is of Formula (9), [B] is of Formula (10), [C] is of Formula (12), [D] is of Formula (13), and X is of Formula (11), wherein [A], [B], [C] and [D] may occur in any order; T is an optionally substituted
substituent; L, G and Z each independently is an optionally substituted linking group; R1, R2 and R3 are each independently H, optionally substituted C1-20-
alkyl or optionally substituted C3-20-cycloalkyl; R4 and R5 are each independently H or C1-4-
alkyl; q is 15 to 1000; p is 3 to 50; J is an optionally substituted hydrocarbyl group; F is an acidic
substituent; E is a basic
substituent; m is 0 to 350; n is 1 to 75; v is 0 to 100; y is 1 to 100; b is 0, 1 or 2; s is 0 or 1; w is 1 to 4; and provided that at least one of R4 and R5 is H.