Ink-jet printing process

A process according to any one of the preceding claims wherein the poly(C3-18-hydrocarbyl monoguanidine) comprises a plurality of groups of Formula (1) and/or groups of Formula (2) or salts thereof:

• wherein:
• each m independently is 0 or 1;
• each Y independently is a C2-18-hydrocarbyl group;
• A and B are hydrocarbyl groups which together comprise a total of 3 to 18 carbon atoms;
• and
• each R independently is hydrogen, optionally substituted alkyl or optionally substituted alkoxy.

A set of liquids suitable for use in an ink-jet printer comprising:

• (a) a first liquid comprising:
• (i) 0.01 to 50 parts of a poly(C3-18-hydrocarbyl monoguanidine);
• (ii) 50 to 99.8 of a liquid medium selected from water, one or more water-soluble organic solvents and a mixture of water and one or more water-soluble organic solvents;
• and
• (iii) 0 to 50 parts of a binder;
• wherein the parts are by weight and the total number of parts (i)+(ii)+(iii)=100;
• and
• (b) an ink comprising a colorant and a liquid medium.