Iridescent fabrics from polyamide yarns

Abstract

An iridescent fabric comprises a cationic-dyeable nylon polymer yarn and an acid-dyeable nylon polymer yarn. The acid dyeable yarn has greater than 35 amine end group (AEG acid ) gram equivalents per 1000 kilograms polymer.

What is claimed is:  
     
         1 . An iridescent textile fabric comprising a cationic-dyeable nylon polymer yarn, and an acid-dyeable nylon polymer yarn, wherein said acid-dyeable yarn has greater than 35 amine end group (AEG acid ) gram equivalents per 1000 kilograms polymer.  
     
     
         2 . An iridescent fabric according to  claim 1  wherein said cationic-dyeable nylon polymer yarn has a sulfonate group (S cat ) concentration of at least 15 gram equivalents per 1000 kilograms polymer and an amine end group (AEG cat ) concentration of no greater than 40 equivalents per 1000 kilograms polymer.  
     
     
         3 . An iridescent fabric according to  claim 1  wherein said cationic-dyeable nylon polymer yarn comprises a plurality of sulfonate end groups (S cat ) and a plurality of amine end groups (AEG cat ) wherein the difference (rho) in concentration between sulfonate end groups (S cat ) and amine end groups (AEG cat ) is according to the following equation: rho=S cat −AEG cat =0.  
     
     
         4 . An iridescent fabric according to  claim 1 , wherein either of the cationic-dyeable or the acid-dyeable nylon yarn comprises from 0 to about less than or equal to about 0.1 weight percent titanium dioxide.  
     
     
         5 . An iridescent fabric according to  claim 4 , wherein said cationic-dyeable or the acid-dyeable nylon yarn which comprises from 0 to about less than or equal to about 0.1 weight percent titanium dioxide comprises a plurality of profiled cross section filaments having a trilobal cross-sectional shape.  
     
     
         6 . An iridescent fabric according to  claim 4 , wherein said cationic-dyeable or the acid-dyeable nylon yarn which comprises from 0 to about less than or equal to about 0.1 weight percent titanium dioxide comprises a plurality of filaments having a diablo cross-sectional shape.  
     
     
         7 . An iridescent fabric according to  claim 5 , wherein the nylon yarn which comprises from 0 to about less than or equal to about 0.1 weight percent titanium dioxide comprises a cationic-dyeable yarn.  
     
     
         8 . An iridescent fabric according to  claim 7 , wherein the acid-dyeable nylon comprises a plurality of filaments having a circular cross-sectional shape.  
     
     
         9 . A process for making an iridescent fabric comprising: dyeing a fabric comprising a cationic-dyeable nylon polymer yarn and an acid-dyeable nylon polymer yarn in a single dye bath with at least one acid dyestuff and at least one cationic dyestuff present in the dye bath, wherein said acid-dyeable yarn has greater than 35 amine end group (AEG acid ) gram equivalents per 1000 kilograms polymer.