METHOD OF PRODUCING POLYVINYL CHLORIDE EXTRUSION COMPOSITION AND COMPOSITION OBTAINED USING SAID METHOD Russian patent published in 2013 - IPC C08L27/06 C08J3/00 C08K5/98 C08K13/02 

FIELD: chemistry.

SUBSTANCE: invention relates to processing polymers into structural materials which are suitable for extruding profiled construction products, primarily siding. The method of producing the composition involves two-step mixing. Cold starting components are successively fed into a first mixer heated to 110-125°C: 40-80 wt % of the total amount of suspended polyvinyl chloride, filler, followed by target additives with a heat stabiliser - tin dibutyl-bis-(2-ethylhexylmaleate), premixed with 3-5 wt % of the total amount of suspended polyvinyl chloride, mixed until temperature of 115-125°C is achieved; the obtained mixture is fed into a second water-cooled mixer; the remaining amount of suspended polyvinyl chloride is added and mixing continues until temperature of the mixture reaches 40-45°C. A composition obtained using said method is disclosed.

EFFECT: high thermal stability of the composition.

2 cl, 1 tbl, 5 ex