THERMOPLASTIC COMPOSITION AND MOLDED PRODUCT Russian patent published in 1999 - IPC

FIELD: polymer materials. SUBSTANCE: thermoplastic composition is distinguished by that it contains (A) 1 to 99 wt % of amorphous polypropylene with following characteristics: [η] > 1 dl/g; percentage of syndiotactic dyads minus percentage of isotactic dyads is superior to zero; less that 2% of methylene groups is contained in sequences (CH₂)_n wherein n ≥ 2; Bernullianisti index is equal to 1 +/- 0.2; and (B) 1 to 99 wt % of component selected from: (B1) propylene copolymer with at least one comonomer selected from ethylene and C₄-C₁₀-alpha-olefin containing at least 85 wt % of propylene-origin units and (B2) polyolefin composition including (i) 10-50 wt % of at least one polymer selected from group including propylene homopolymer with isotacticity index above 80 and propylene copolymer with at least one comonomer selected from ethylene and C₄-C₁₀-alpha-olefin containing at least 85 wt % of propylene-origin units; (ii) 40-80 wt % of copolymer containing 10-40 wt % of ethylene- origin units, 90-60 wt % of units furnished by at least one comonomer selected from C₃-C₁₀-alpha-olefins, and 0-5 wt % of diene-origin units, said copolymer being soluble in xylene at room temperature and having intrinsic viscosity within a range of 1.5 to 4 dl/g; provided that the sum of i and ii components equals 50-90% of the weight of polyolefin composition and weight ratio i/ii is below 0.4. EFFECT: improved mechanical and optical properties of material suitable for manufacturing biomedicine-destination products. 6 cl, 1 tbl, 11 ex