SHOCK-RESISTANT POLYOLEFIN COMPOSITIONS Russian patent published in 2004 - IPC

FIELD: polymer materials.

SUBSTANCE: polyolefin composition contains 60-95% of component A: crystalline polypropylene having melt flowing rate 2.5 to 50 g/10 min and 5-40% of component B: copolymer of ethylene with one or several C₄-C₁₀-α-olefins containing 10-40% of C₄-C₁₀-α-olefins. Component A contains 20 to 80% of fraction A^I and 20 to 80% of fraction A^II, each of A^I and A^II being selected from propylene homopolymers, random propylene copolymers containing up to 15% ethylene, and/or C₄-C₁₀-α-olefins. Fraction A^I is characterized by melt flowing rate 0.5 to 8 g/10 min as measured at 230^оС under loading 2.16 kg and ratio of melt flowing rates for fraction A and fraction A^I ranges from 2 to 25. Compositions combine such properties as workability, impact resistance, low turbidity, reduced trend to form dull deposit, and low content of fraction extractable by organic solvent.

EFFECT: improved performance characteristics.

10 cl, 2 tbl, 4 ex