ELASTIC COMPOSITIONS ON PROPYLENE COPOLYMER BASE WITH HIGH DEGREE OF TRANSPARENCY Russian patent published in 2008 - IPC C08L23/00 C08L23/16 C08F297/08 C08F210/06 

FIELD: chemistry.

SUBSTANCE: the composition includes: A) propylene copolymer, containing 1-20 wt % of olefins other than propylene, B) at least one propylene copolymer, containing 10-30 wt % of olefins other than propylene, and C) optionally common additives, where proportion of propylene A to propylene B amounts from 80:20 to 50:50 by weight; composition of propylene copolymers is produced by two-stage or multi-stage polymerisation, using catalyst system based on metallocenes compounds, applied on both stages. Copolymer of propylene A and copolymer of propylene B present as distinct phases, and n-hexane soluble material content amounts ≤ 2.6 wt %.

EFFECT: low hardness and good transparency; high impact elasticity at low temperatures, good whiten properties, homogenous co-monomers distribution, acceptable organoleptic properties.

10 cl, 3 tbl, 1 ex