ONE-STEP METHOD OF DYEING POLYURETHANE FIBRES Russian patent published in 2018 - IPC D06P3/00 

FIELD: textile and paper.

SUBSTANCE: invention relates to textile industry, in particular to dye-finishing, and concerns method of polyurethane fibres dyeing. Objective is achieved by a one-step method for polyurethane fibres dyeing, consisting in the fact that the fiber is treated in an aqueous solution of aromatic aldehyde with addition of hydrochloric acid at a temperature of 80–100 °C 45–60 min, in following ratio of components, % of fiber weight: aromatic aldehyde – 1–3; hydrochloric acid (1M) – 1–5, and then washed with running cold water.

EFFECT: provides an expansion of the range of products from polyurethane fibers and a reduction in the technological process of dyeing.

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