FIBERS FROM POLYHEXAMETHYLENE DIPAMIDE AND METHOD OF PREPARING SAID FIBERS Russian patent published in 1999 - IPC

FIELD: manufacture of clothes capable of being dyed into deep colors. SUBSTANCE: fibers comprise polymer containing from 70 to 100 wt % of hexamethylene dipamide units of formula (I): R₁ or mixed polymer containing at least 70 wt % or polyhexamethylene dipamide and up to 30 wt % of polyamide selected from group consisting of nylon-6, nylon-12, nylon-160, nylon- 612 nylon-46 and nylon-6T and satisfies the following conditions (A) and (B): (A) said fibers from polyhexamethylene dipamide contain 0.01-1.0 wt % of 2,4- bis (alkylthio)-6-(3,5-dialkyl-4-hydroxyanilino)-1,3,5- triazine of general formula II: R₂ wherein R₃ is tret-butyl or hydrocarbon group containing 1-4 carbon atoms, and and are each hydrocarbon group containing 5-10 carbon atoms; (B) said fibers from polyhexamethylene dipamide comprises 0.005-1.0 wt % of one or more compounds selected from group consisting of phosphorous acid, phosphorous acid derivatives, hypophosphorous acid and hypophosphorous acid derivatives. Described also is method of preparing stable and thermal yellowing of said fibers colored into deep colors. EFFECT: more efficient preparation method. 15 cl, 37 ex, 16 tbl