COMPOSITION AND METHOD OF PRODUCING RAILROAD SLEEPERS Russian patent published in 2015 - IPC C08L95/00 C08L23/12 B29C47/00 C08K7/14 E01B3/44 E01B3/46 C08J11/04 

FIELD: chemistry.

SUBSTANCE: invention relates to novel compositions for railroad sleepers and methods for production thereof. A method of producing sleepers, which includes a first part made from a first composition and a second part made from a second composition, wherein the first composition includes 15-75 wt % of a first asphalt component and 85-25 wt % of a first polymer component, and the second composition includes 20-85 wt % of a second asphalt component and 80-15 wt % of a second polymer component, each of the polymer components including a mixture prepared for treating plastic and fibrous reinforcing material, the method comprising: (i) separate preparation and mixing of the selected amounts of asphalt and plastic to obtain a first and a second mixture; (ii) separate melting and treatment of the first and second mixtures in processors capable of heating and feeding said mixtures separately in form of a complex asphalt-plastic composition into pumping devices connected to a coextrusion die; and (a) pumping the first composition into a first mould section to form the internal part of the railroad sleeper and simultaneously feeding the second composition into the external part of the mould to form the external part of the railroad sleeper, (b) pumping the second composition into a first mould section to form the internal part of the railroad sleeper and simultaneously feeding the first composition into the external part of the mould to form the external part of the railroad sleeper.

EFFECT: obtained railroad sleeper is durable and is resistant to weather and insects.

14 cl, 1 dwg