FIELD: chemistry of polymers.
SUBSTANCE: invention relates to using isotactic polypropylenes of very high fluidity value used in preparing high-filled mother mixture or mineral filling agent concentrate used in filling thermoplastic material of olefin type. As a binding agent the mother mixture or mineral filling agent concentrate comprises at least one isotactic polypropylene showing the fluidity index 200 g/10 min or above that is measured according to the modified norm NF T 51-620 (190°C - 10 kg - 1.05 mm) and the crystallinity degree measured by DSC method, above 20% wherein the amount of mineral filling agent in the mother mixture or the concentrate is above 80 wt.-%. Using isotactic polypropylene of very high fluidity index as a component of the mother mixture provides preparing mother mixtures with high concentrations of filling agent dispersed repeatedly into different polymeric matrices that are used in plastics manufacture. Also, industrial articles made of these plastics show the improved mechanical properties.
EFFECT: improved and valuable properties of thermoplastics and filling agent concentrates.
19 cl, 3 tbl, 95 ex
