RESIN COMPOSITION Russian patent published in 2005 - IPC

FIELD: treatment of thermoplastic resin composition based on polyvinylchloride by extrusion for pipelines manufacturing.

SUBSTANCE: claimed composition contains polyvinylchloride with K_f = 55-60, tribasic lead sulfate, dibasic lead stearate, titanium dioxide, paraffin, metal-containing lubricant with acidic number at most 3 mg KOH/g. Lubricant is obtained by interaction of alpha-branched saturated monocarboxylic C10-C28-acids with polyhydric alcohol at 180-220°C in molar ratio of 1:(1-2) in presence of bivalent metal oxides: CaO, PbO, ZnO, MgO or two-component mixture thereof in ratio of 1:1, in amount of 0.5-2.0 mass % calculated as total reaction mass. As polyhydric alcohol ethylene glycol, glycerol, polyglycerol, which represents slop from glycerol distillation, are used.

EFFECT: resin composition of improved workability, heat resistance and melt index; articles with more glazed surface.

2 cl, 15 ex, 1 tbl