Method for treating the surface of particles, the thus obtained particles and use thereof

Particles comprising:

• TiO2, BaSO4, ZnS or lithopone with a coating comprising at least one compound of formula (I)
• in which
• R is R1, methyl or hydroxy,
• R1 is a polyether group of formula (II):
• —Z—(O—CmH2m-(n-1))o—[O-(EOx,POy,BOz)—R3]n (II),
• in which
• Z is equal to a branched or unbranched alkylene group having 2 to 4 carbon atoms,
• m is 2 to 4,
• n is 1 to 3,
• o is 0 or 1,
• EOx, POy, BOz is an oxyalkykene group, containing oxyethylene (EO), oxypropylene (PO) and/or oxybutylene (BO) units, wherein x, y and z are each ≧0 and at least one of x, y and z is unequal to 0,
• R3 is hydrogen when n=1, or is a hydrocarbon group having 1 to 4 carbon atoms, and with the provision that in R1 the sum of carbon and oxygen atoms is at least 70,
• a is 20 to 200,
• b is 1 to 50, with the provision that when none of the groups R is equal to R1, b is at least 3,
• and comprising at least one phthalate-free plasticiser,
• wherein the at least one compound of formula (I) is present with a proportion of from 0.01 to 2% by weight, and
• wherein the at least one phthalate-free plasticiser is present with a proportion of from 0.01 to 4.0% by weight,
• wherein the values in % by weight relate to the weight of the used dried primary particles.