Method for reactive dyeing of leather

Abstract

The present invention relates to a method for reactive dyeing of leather, which includes: providing a reactive dye solution including at least one reactive dye and water, and making the reactive dye in the reactive dye solution to act on crust leather at a temperature from 25° C. to 70° C. to form covalent bonds between the reactive dye and the crust leather. Accordingly, the method for reactive dyeing of leather according to the present invention can enhance fastness and levelling property.

1 - 10 . (canceled) 
     
     
         12 . A method for reactive dyeing of leather, comprising:
 providing a reactive dye solution comprising at least one reactive dye and water;   contacting the reactive dye solution with crust leather at a temperature from 25° C. to 70° C. so that the reactive dye acts on the crust leather to form covalent bonds between the reactive dye and the crust leather; and   adding a fixing agent so that the fixing agent to acts on the crust leather,   wherein the fixing agent contains polyamide.   
     
     
         13 . The method of  claim 12 , wherein the reactive dye contains a group of —SO 2 CH═CH 2  or —SO 2 CH 2 CH 2 W, and W is a leaving group which is eliminable by a base. 
     
     
         14 . The method of  claim 13 , wherein W is —Cl, —OSO 3 H, 
       
         
           
           
               
               
           
         
       
       and R 1 , R 2  and R 3  each independently are C 1-4  alkyl. 
     
     
         15 . The method of  claim 12 , wherein the reactive dye is selected from the group consisting of 
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
       
       Everzol Yellow ED, Everzol Yellow NPN, Everzol Yellow LX, Everzol Yellow ED-R, Everzol Yellow GRB, Everzol Yellow PFG, Everzol Yellow 4GL, Everzol Yellow C-GL, Everzol Yellow 3GL, Everzol Yellow ED-2G, Everzol Yellow RNL, Everzol Yellow GSP, Everzol Yellow ED-S, Everzol Yellow GR, Everzol Yellow 3R, Everzol Orange GR, Everzol Orange 2R, Everzol Orange 2GS, Everzol Orange ED-2R, Everzol Scarlet 3GF, Everzol Orange GSP, Everzol Orange ED, Everzol Orange 3R, Everzol Orange ED-G, Everzol Orange ED-R, Everzol Red BS, Everzol Red ED-7B, Everzol Red LF-B, Everzol Red ED-2B, Everzol Red ED, Everzol Red F2B, Everzol Red 3BS, Everzol Red ED-S, Everzol Red BB, Everzol Red RBN, Everzol Rubine ED, Everzol Red ED-3R, Everzol Red ED-38, Everzol Red LX, Everzol Red F3B, Everzol Red LF-2B, Everzol Red C-3B, Everzol Rubine ED-R, Everzol Navy Blue GG, Everzol Navy Blue BRF, Everzol Blue ED, Everzol Navy ED, Everzol Navy Blue FBN, Everzol Blue ED-G, Everzol Dark Blue LF, Everzol Blue LX, Everzol Blue R SIP, Everzol Turquoise Blue G, Everzol Navy LX, Everzol Navy Blue ROB H/C, Everzol Blue BB, Everzol Brown LNS, Everzol Black ED-G, Everzol Black GRN, Everzol Black GSP, Everzol Black GR, Everzol Black ED-2R, Everzol Black MW, Everzol Black B, Everzol Black C-RL, Everzol Black ED, Everzol Black ED-R, Everzol Black N, Everzol Black LNS, Everzol Black NR and a mixture thereof. 
     
     
         16 . The method of  claim 12 , wherein the reactive dye solution further comprises a dispersant. 
     
     
         17 . The method of  claim 16 , wherein the dispersant contains naphthalene sulfonic acid condentate. 
     
     
         18 . The method of  claim 12 , wherein the reactive dye acts on the crust leather under a pH from 9 to 11. 
     
     
         19 . The method of  claim 12 , wherein the reactive dye acts on the crust leather for 100 minutes to 330 minutes. 
     
     
         20 . The method of  claim 12 , wherein the reactive dye acts on the crust leather at a temperature from 55° C. to 70° C.