PIPING SYSTEM MANUFACTURED FROM STATISTICAL COPOLYMERS OF PROPYLENE AND ALPHA-OLEFINS Russian patent published in 2009 - IPC F16L11/04 B32B1/08 

FIELD: machine building.

SUBSTANCE: invention relates to piping systems, manufactured from polycrystalline statistical polymers of propylene and α-olefines. In piping systems, including at least one layer containing polycrystalline statistical polymer of propylene and from 0.2 up to 5% wt. 1-hexen and not necessarily iterative link, selected from ethylene and C₄-C₁₀ α-olefine, in amount in the range from more than 0 up to 9% mole polymer demonstrates wide chain-length distribution, expressed through ratio between middle-mass molecular weight and middle-numeral molecular weight , described by formula (I), in the range from 5 up to 11, chain-length distribution of unimodal type and level of hexen content-1 in fraction, allowing limiting viscosity index, equal or more than 3.3 dl/g, which is less than level of hexen content-1 in fraction, allowing limiting viscosity index, less than 3.3 dl/g.

EFFECT: development of method of receiving of piping systems manufactured from polycrystalline statistical polymers of propylene and α-olefine and method of receiving of polycrystalline statistical propylene and 1-hexen.

12 cl