METHOD OF PRODUCING EXTRUSION COLOURED POLYVINYL CHLORIDE COMPOSITION AND EXTRUSION COLOURED POLYVINYL CHLORIDE COMPOSITION FOR BUILDING PURPOSES Russian patent published in 2014 - IPC C08J3/20 C08L27/06 C08K9/06 C08K3/30 

FIELD: chemistry.

SUBSTANCE: method includes preliminary mixing of an organic pigment and a liquid organosilicon oligomer in a separate container to obtain a modified organic pigment. A first mixer is preheated to 110-125°C. While the mixer operates, a polyvinyl chloride suspension is fed, as well as the following target additives, successively: filler, tribasic lead sulphate as a heat stabiliser and then the rest of the target additives. The modified organic pigment is fed last. The mixture is mixed until temperature of 115-125°C is achieved. The obtained mixture is reloaded into a water-cooled second mixer and mixing continues until temperature of the mixture reaches 40-45°C.

EFFECT: improved colour fastness of the composition.

2 cl, 3 tbl