THERMOPLASTIC COMPOSITION FOR MAKING LARGE-SIZE, THIN-WALLED ARTICLES AND METHOD OF PRODUCING STABILISED MODIFIER FOR THERMOPLASTIC COMPOSITION Russian patent published in 2014 - IPC C08L23/12 C08L23/10 

FIELD: chemistry.

SUBSTANCE: thermoplastic composition contains polypropylene, ethylene-propylene rubber, filler and a modifier, with the following ratio of components, wt %: polypropylene - 60-75, ethylene-propylene rubber - 15-25, stabilised modifier - 2-6, mineral filler - 4-14, target additives - 0.5-1.5. The method of producing a stabilised modifier for the thermoplastic composition involves subjecting double or triple ethylene-propylene rubber, in the presence of crystalline sulphur in amount of 0.05-0.2 pts.wt of the weight of the rubber, at temperature of 150-180°C and pressure of 1-3 MPa, to shearing action on an extruder head at shearing rate of 1000-2000 s^-1 to effective viscosity of 30-100 Pa*s.

EFFECT: making large-size, thin-walled articles by increasing melt fluidity while maintaining or improving physical and processing characteristics.

2 cl, 2 tbl, 2 ex