Process for improving the lightfastness of conventionally dyed l

Details Process for improving the lightfastness of conventionally dyed l Process for improving the lightfastness of conventionally dyed l

1979-09-06

1982-03-09

Tungol, Maria Parrish

Bleaching and dyeing; fluid treatment and chemical modification

Dyeing involving animal-derived natural fiber material ,...

Leather dyeing

8437, 8 9423, 8 9422, D06P 332

Patent

active

043187056

ABSTRACT:
The invention relates to a process for improving the lightfastness of conventionally dyed leathers by treating the leathers before, during or after fatting with alkane and/or chloroalkane sulfonamides in amounts of about 0.1 to 8 weight percent, based on the shaved weight of the leather. Used as alkane sulfonamides and chloroalkane sulfonamides are preferably products with a chain length of about 10 to 35 carbon atoms and a chlorine content of about 10 to 40%. The alkane and/or chloroalkane sulfonamides are advantageously used in aqueous solution or in stable emulsion. A substantial improvement in lightfastness is obtained regardless of the type of the dye, tanning agent, fatting agent or other leather treating agent used.

REFERENCES:
patent: 2334186 (1943-11-01), Fox

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