Formaldehyde condensate and fiber treatment agent containing it

摘要

A formaldehyde condensate obtained by a polycondensation reaction of a phenol compound mixture with formaldehyde and reduction treatment of the resulting polycondensation reaction product with a dithionite or thiosulfate, and a polyamide fiber material dye fixing agent and polyamide fiber material contamination inhibitor containing the formaldehyde condensate. The dye fixing agent and contamination inhibitor produce no coloration during treatment and exhibit low loss of light fastness.