A crosslinking material and uses thereof

Abstract

A crosslinking material, the crosslinking material comprising the reaction product of a reaction mixture comprising: (i) a cyclic unsaturated acid anhydride and/or diacid derivative thereof; (ii) an ethylenically unsaturated monomer; and (iii) an alcohol, amine and/or thiol, wherein the cyclic unsaturated acid anhydride and/or diacid derivative thereof is partially-esterified by reaction with the alcohol, amine and/or thiol; and wherein the crosslinking material has an acid number of at least 100 mg KOH/g.

1 . A crosslinking material, the crosslinking material comprising the reaction product of a reaction mixture comprising:
 (i) a cyclic unsaturated acid anhydride and/or diacid derivative thereof;   (ii) an ethylenically unsaturated monomer; and   (iii) an alcohol, amine and/or thiol,   
       wherein at least a portion of the cyclic unsaturated acid anhydride and/or diacid derivative thereof is reacted with the alcohol, amine and/or thiol; 
       and wherein the crosslinking material has an acid number of at least 100 mg KOH/g. 
     
     
         2 . The crosslinking material according to  claim 1 , wherein the crosslinking material has a Tg of at least 50° C. 
     
     
         3 . The crosslinking material according to  claim 1 , wherein the cyclic unsaturated acid anhydride comprises maleic anhydride. 
     
     
         4 . The crosslinking material according to  claim 1 , wherein the ethylenically unsaturated monomer comprises a hydroxyl functional monomer. 
     
     
         5 . The crosslinking material according to  claim 1 , wherein the ethylenically unsaturated monomer comprises styrene, one or more vinyl ether monomer(s), vinyl acetate or combinations thereof. 
     
     
         6 . The crosslinking material according to  claim 1 , wherein the ethylenically unsaturated monomer comprises styrene. 
     
     
         7 . The crosslinking material according to  claim 1 , wherein the amine and/or thiol is hydroxy functional. 
     
     
         8 . The crosslinking material according to  claim 1 , wherein the alcohol comprises ethanol. 
     
     
         9 . The crosslinking material according to  claim 1 , wherein the crosslinking material has an acid number from 120 to 500 mg KOH/g. 
     
     
         10 . The crosslinking material according to  claim 1 , wherein the crosslinking material has a hydroxyl number of ≥10 mg KOH/g. 
     
     
         11 . The crosslinking material according to  claim 1 , wherein the crosslinking material has a number-average molecular weight (Mn) from 1,000 to 5,000 Da. 
     
     
         12 . The crosslinking material according to  claim 1 , wherein the crosslinking material is substantially free of formaldehyde. 
     
     
         13 . A coating composition, the coating composition comprising:
 (a) a film-forming resin comprising a functional group having an active hydrogen atom; and   (b) a crosslinking material according to  claim 1 .   
     
     
         14 . The coating composition according to  claim 13 , wherein the crosslinking material has a glass transition temperature of at least 50° C. 
     
     
         15 . The coating composition according to  claim 13 , wherein the film-forming resin comprises an emulsion polymerised acrylic latex material. 
     
     
         16 . A package coated on at least a portion thereof with a coating, the coating being derived from a coating composition, the coating composition comprising:
 (a) a film-forming resin comprising a functional group having an active hydrogen atom; and   (b) a crosslinking material operable to crosslink the functional group having an active hydrogen atom on the film-forming resin, the crosslinking material comprising the reaction product of a reaction mixture comprising:
 (i) a cyclic unsaturated acid anhydride and/or diacid derivative thereof; 
 (ii) an ethylenically unsaturated monomer; and 
 (iii) an alcohol, amine and/or thiol, 
   
       wherein at least a portion of the cyclic unsaturated acid anhydride and/or diacid derivative thereof is reacted with the alcohol, amine and/or thiol; 
       and wherein the coating composition comprises 5 to 30 wt % of the crosslinking material based on the total solid weight of the coating composition. 
     
     
         17 . The package according to  claim 16 , wherein the package comprises a metal food and/or beverage can and/or a monobloc aerosol can and/or tube. 
     
     
         18 . (canceled) 
     
     
         19 . (canceled) 
     
     
         20 . (canceled) 
     
     
         21 . (canceled) 
     
     
         22 . The package according to  claim 16 , wherein the film-forming resin comprises an emulsion polymerised acrylic latex material. 
     
     
         23 . A package coated on at least a portion of an interior surface thereof with a coating, the coating being derived from a coating composition, the coating composition comprising:
 (a) a film forming resin; and   (b) a crosslinking material, the crosslinking material comprising the reaction product of a reaction mixture comprising:
 (i) a cyclic unsaturated acid anhydride and/or diacid derivative thereof; 
 (ii) an ethylenically unsaturated monomer; and 
 (iii) an alcohol, amine and/or thiol, 
   
       wherein at least a portion of the cyclic unsaturated acid anhydride and/or diacid derivative thereof is reacted with the alcohol, amine and/or thiol; 
       and wherein the coating composition is a sprayable coating composition. 
     
     
         24 . The package according to  claim 23 , wherein the film-forming resin comprises an emulsion polymerised acrylic latex material. 
     
     
         25 . (canceled) 
     
     
         26 . (canceled)