SAND WITH MULTILAYER POLYMER COATING Russian patent published in 2011 - IPC C09C1/28 C09C3/10 C04B20/10 C04B20/12 C04B14/06 E01C13/08 

FIELD: chemistry.

SUBSTANCE: invention relates to grain materials with multilayer polymer coating and a method of producing said material. The method involves mixing a first thermoplastic polymer with a grainy substrate to form a mixture at temperature higher than the melting point of the first thermoplastic polymer, cooling the mixture to temperature lower than the melting point of the first thermoplastic polymer and merging the cooled mixture with a second thermoplastic polymer, where the melting point of the second thermoplastic polymer is lower than the temperature of the cooled mixture. Further, the merged mixture is cooled to temperature lower than the melting point of the second polymer. Use of polymers with low melting point in the grain material can successfully lower requirements for heating and cooling, thus reducing power consumption of the process, leading to shorter duration of the cycle. The obtained grain material is used as filler for artificial coatings.

EFFECT: grainy filler has uniform and homogeneous coating, which makes the surface of the filler soft, thereby giving excellent wear resistance, good aesthetic and tactual properties, and ensures safety for the player.

45 cl, 1 ex