FIBERS FROM RENEWABLE LOW DENSITY POLYESTERS Russian patent published in 2017 - IPC D01F6/92 D01F1/10 D04H1/724 D01D5/08 D02G3/00 A61F13/15 

FIELD: chemistry.

SUBSTANCE: fibers are obtained from a thermoplastic composition which comprises hard renewable polyester, has a porous structure and a low density. To obtain such a structure, a renewable polyester is mixed with a polymer additive that increases the impact strength, so that the additive can be dispersed as discrete physical domains in a continuous matrix of renewable polyester. Then, fibers are formed which is subjected to tension or stretching at a temperature below the glass transition temperature of the polyester, i.e. subjected to cold drawing. The deformation force and stress at elongation during stretching leads to disruption of adhesion in the renewable polyester matrixin the areas adjacent to the discrete domains. As a result a mesh structure is obtained of pores located near the discrete domains, which by their proximity may form bridges between the pore boundaries, acting as internal structural "hinges" that promote stabilization of the mesh structure and increase its ability to dissipate energy.

EFFECT: obtaining of fibers from renewable polyester with low density and good mechanical properties.

20 cl, 2 dwg, 8 tbl, 11 ex