METHOD OF FORMING POROUS FIBRES Russian patent published in 2020 - IPC D04H1/40 

FIELD: chemistry.

SUBSTANCE: group of inventions relates to a method of forming a fibre, a nonwoven web and an absorbent product. Method involves extrusion of a matrix polymer and a nano-additive to form a thermoplastic composition in which the additive-on-addition is dispersed in the continuous phase of the matrix polymer. Then the extruded thermoplastic composition is passed through a draw plate to form a fibre having a porous network containing a plurality of nanopores, wherein the average percentage volume occupied by nanopores within a given volume of a fibre unit ranges from 3 % to 15 % per cm³, where the matrix polymer contains a polyester.

EFFECT: method enables to obtain fibres with low density.

21 cl, 2 dwg, 1 tbl, 13 ex