Pigment dyeing composition based on a particular acrylic polymer and silicone copolymer

A composition comprising:

• at least one aqueous dispersion of particles of at least one hybrid film-forming hydrophobic acrylic polymer synthesized from at least one monomer having at least one (meth)acrylic acid group and/or from esters of these acid monomers and/or from amides of these acid monomers, and from at least one styrene compound,
• at least one linear block silicone copolymer in the form of particles in dispersion in an aqueous medium, and
• at least one pigment,
• wherein the at least one hybrid film-forming hydrophobic acrylic polymer and the at least one linear block silicone copolymer are present in a weight ratio of (hybrid film-forming hydrophobic acrylic polymers):(linear block silicone copolymers) ranging from about 0.2 to about 10;
• wherein the at least one linear block silicone copolymer is obtained by a chain extension reaction, in the presence of at least one catalyst, from at least:
• (a) a polysiloxane (i) having at least one reactive group per molecule;
• and
• (b) an organosilicone compound (ii) which reacts with the polysiloxane (i) by a chain extension reaction;
• wherein the composition does not include a wax;
• wherein the composition does not include an oxidizing agent;
• and
• wherein the composition is a hair dyeing composition.