Reactive dye composition and method of dyeing polyamide materials

Abstract

The present invention relates to a method of dyeing polymeric substrates having pendent carboxyl groups, especially polyamides. The method comprises applying to a substrate a reactive dye solution and heating the substrate in the presence of a magnesium donor at a pH of greater than 9.0, such that the reactive dye forms a covalent bond with the carboxyl groups on the substrate. A dye composition for dyeing a polymeric substrates having pendent carboxyl groups is also disclosed.

1 . A method of dyeing a substrate of a polymeric material having pendent carboxyl groups, said method comprising: 
 contacting said substrate with an aqueous reactive dye solution; and    heating said substrate in the presence of a magnesium donor compound at a pH of greater than 9.0, such that said reactive dye forms a covalent bond with said carboxyl groups on said substrate.    
   
   
       2 . The method of  claim 1  further comprising the step of drying the substrate before the heating step.  
   
   
       3 . The method of  claim 1  further comprising the step of drying the substrate after the heating step.  
   
   
       4 . The method of  claim 1 , wherein said polymeric material is a polyamide.  
   
   
       5 . The method of  claim 1 , wherein said polymeric material is Type 6 nylon; Type 6,6 nylon; cationic dyeable Type 6 nylon; cationic dyeable Type 6,6 nylon; Kevlar or Nomex.  
   
   
       6 . The method of  claim 1 , wherein said polymeric material is wool or silk.  
   
   
       7 . The method of  claim 1 , wherein said magnesium donor compound comprises a magnesium salt.  
   
   
       8 . The method of  claim 1 , wherein said magnesium donor compound is magnesium sulfate or magnesium hydroxide.  
   
   
       9 . The method of  claim 1 , wherein said pH is approximately 10 to approximately 13.  
   
   
       10 . The method of  claim 1 , wherein said reactive dye solution comprises a reactive dye selected from dichlorotriazynyl reactive dye, vinyl sulfone reactive dye, monochlorotriazine reactive dye, monofluorotriazine reactive dye, trichloropyrimidine reactive dye, diflourochloropyrimidine reactive dye, dichloroquinoxaline reactive dye, or mixtures thereof.  
   
   
       11 . The method of  claim 1 , wherein said substrate is a fiber.  
   
   
       12 . The method of  claim 1 , wherein said substrate is a yarn.  
   
   
       13 . The method of  claim 1 , wherein said substrate is a fiber, a yarn, a woven fabric, a nonwoven fabric, a tufted fabric, a sheet, or a ribbon.  
   
   
       14 . The method of  claim 1 , wherein said substrate is heated to a temperature of approximately 220° to 280° F.  
   
   
       15 . The method of  claim 1 , wherein said substrate is heated to a temperature of approximately 260° F.  
   
   
       16 . A fiber dyed by the process of  claim 1 .  
   
   
       17 . A yarn dyed by the process of  claim 1 .  
   
   
       18 . A tufted fabric dyed by the process of  claim 1 .  
   
   
       19 . A textile material dyed by the process of  claim 1 .  
   
   
       20 . A textile material having a pre-dyed fiber or yarn therein pre-dyed by the process of  claim 1 .  
   
   
       21 . A carpet having a pre-dyed fiber or yarn therein pre-dyed by the process of  claim 1 .  
   
   
       22 . A method of dyeing a substrate of a polymeric material having pendent carboxyl groups, said method comprising: 
 contacting said substrate with an aqueous dye solution comprising;    a reactive dye; and    an Mg +2  donor compound, said aqueous dye solution having a pH of greater than 9.0; and    heating said substrate while contacting said aqueous dye solution to a temperature of approximately 220° to 280° F.    
   
   
       23 . The method of  claim 22  further comprising the step of drying the substrate before the heating step.  
   
   
       24 . The method of  claim 22  further comprising the step of drying the substrate after the heating step.  
   
   
       25 . A substrate of a polyamide material having pendent carboxyl groups dyed with a reactive dye solution, whereby said fiber reactive dye solution forms a covalent bond with said carboxyl groups on said substrate.  
   
   
       26 . The substrate of  claim 25 , wherein said substrate is selected from Type 6 nylon; Type 6,6 nylon; cationic dyeable Type 6 nylon; cationic dyeable Type 6,6 nylon; Kevlar and Nomex.  
   
   
       27 . A dye composition comprising in aqueous solution: 
 a reactive dye;    a magnesium donor; and    a pH adjusting component in an amount sufficient to adjust the pH of said dye composition to greater than 9.0.    
   
   
       28 . The dye composition of  claim 27 , wherein said reactive dye comprises a reactive dye selected from dichlorotriazynyl reactive dye, vinyl sulfone reactive dye, monochlorotriazine reactive dye, monofluorotriazine reactive dye, trichloropyrimidine reactive dye, diflourochloropyrimidine reactive dye, dichloroquinoxaline reactive dye, or mixtures thereof.  
   
   
       29 . The dye composition of  claim 27 , wherein said magnesium donor comprises a magnesium salt.  
   
   
       30 . The dye composition of  claim 27 , wherein said magnesium donor is selected from magnesium sulfate and magnesium hydroxide.  
   
   
       31 . The dye composition of  claim 27 , wherein said pH adjusting component in an amount sufficient to adjust the pH of said dye composition to approximately 10 to approximately 13.  
   
   
       32 . The dye composition of  claim 27 , wherein said pH adjusting component is an alkali metal hydroxide or an alkali metal carbonate.  
   
   
       33 . The dye composition of  claim 27 , wherein said pH adjusting component is sodium hydroxide or potassium hydroxide.  
   
   
       34 . The dye composition of  claim 27 , wherein said pH adjusting component is sodium carbonate, sodium bicarbonate, potassium carbonate or potassium bicarbonate.  
   
   
       35 . A dye composition comprising: 
 approximately 0.01% to 10% by weight of a reactive dye selected from dichlorotriazynyl reactive dye, vinyl sulfone reactive dye, monochlorotriazine reactive dye, monofluorotriazine reactive dye, trichloropyrimidine reactive dye, diflourochloropyrimidine reactive dye, dichloroquinoxaline reactive dye, or mixtures thereof;    approximately 0.01% to 10% by weight magnesium sulfate;    an amount of sodium hydroxide sufficient to adjust the pH of said dye composition to greater than 9.0; and    water in an amount sufficient to make the dye composition 100% by weight.