Process for making tiles

A process for making tiles comprising:

• i) mixing the ceramic raw materials;
• ii) dry-grinding the ceramic raw materials or wet-grinding the ceramic raw materials and spray drying the ceramic slip obtained from the wet-grinding;
• iii) forming green tiles by pressing the powdery grinded ceramic raw materials obtained from step ii);
• said process being characterized by the addition to the ceramic raw materials, before step iii), of from 0.01 to 5.0% by weight, based on the weight of the ceramic raw materials (dry matter), of a composition comprising, on dry weight basis, from 3 to 70% by weight of a polymer obtained by polymerization of:
• a) from 0 to 50% by weight of at least one ethylenically unsaturated monomer selected among styrene or substituted styrene,
• b) from 10 to 80% by weight of at least one ethylenically unsaturated monomer selected among C1-C10-alkyl (meth)acrylates or cycloalkyl (meth)acrylates,
• c) from 0 to 30% by weight of at least one ethylenically unsaturated monomer different from a) and b),
• in the presence of
• d) from 20 to 90% by weight of a sugar or a degraded polysaccharide having a molecular weight Mn of 500 to 30,000 Da,
• wherein the percentage amounts of a), b), c) and d) are referred to the sum of a)+b)+c)+d).