Adhesive detackification

Abstract

The invention describes a method of curing a polymerizable material containing ethylenically unsaturated bonds at a temperature of 60° C. or less, comprising the steps of (a) providing a curative comprising an effective amount of a light-stable isomer of a 2,4,5-triarylimidazolyl dimer, such as bilophine; (b) activating said curative by application of an activator selected from the group consisting of solvent and friction; and (c) combining the activated curative with the polymerizable material. Articles comprising an adhesive having a detackified surface, such as adhesive bandages, a detackifying solution, a two-part adhesive system, and a fastening system are also provided.

1 . A method of curing a polymerizable material containing ethylenically unsaturated bonds at a temperature of 60° C. or less, comprising the steps of: 
 a) providing a curative comprising an effective amount of a light-stable isomer of a 2,4,5-triarylimidazolyl dimer;    b) activating said curative by application of an activator selected from the group consisting of solvent and friction; and    c) combining the activated curative with the polymerizable material.    
   
   
       2 . The method of  claim 1  wherein said 2,4,5-triarylimidazolyl dimer is a light-stable isomer of bilophine.  
   
   
       3 . The method of  claim 2  wherein said light-stable isomer of bilophine is 4-4′ bilophine.  
   
   
       4 . The method of  claim 1  wherein said curative additionally comprises an amine.  
   
   
       5 . The method of  claim 4  wherein step c) is performed in the presence of air or oxygen.  
   
   
       6 . The method of  claim 1  wherein said curative additionally comprises a secondary or tertiary amine.  
   
   
       7 . The method of  claim 1  wherein said curative additionally comprises a tertiary amine.  
   
   
       8 . The method of  claim 7  wherein said tertiary amine is N-methyl diethanolamine.  
   
   
       9 . The method of  claim 1  wherein said activator is solvent.  
   
   
       10 . The method of  claim 9  wherein said solvent is a liquid at the reaction temperature.  
   
   
       11 . The method of  claim 10  wherein said solvent is a reactive solvent selected from the group consisting of methyl acrylate, methyl methacrylate, ethyl acrylate, isopropyl methacrylate, n-hexyl acrylate, stearyl acrylate, allyl acrylate, glycerol diacrylate, glycerol triacrylate, ethyleneglycol diacrylate, diethyleneglycol diacrylate, triethyleneglycol dimethacrylate, 1,3-propanediol diacrylate, 1,3-propanediol dimethacrylate, trimethylolpropane triacrylate, 1,2,4-butanetriol trimethacrylate, 1,4-cyclohexanediol diacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, pentaerythritol tetramethacrylate, vinyl compounds, and mixtures thereof.  
   
   
       12 . The method of  claim 10  wherein said solvent is a non-reactive solvent selected from the group consisting of toluene, xylene, cumene, mesitylene, phenyl acetate, methyl benzoate, benzyl acetate, ethyl benzoate, ethyl acetate, benzyl alcohol, butanol, and propanol.  
   
   
       13 . The method of  claim 9  wherein said solvent comprises said polymerizable material.  
   
   
       14 . The method of  claim 1  wherein said activator is friction.  
   
   
       15 . A method of detackifying an adhesive comprising the method of curing of  claim 1 .  
   
   
       16 . An article comprising an adhesive having a surface that is detackified according to the method of  claim 15 .  
   
   
       17 . A method of making an article comprising an adhesive having a detackified surface comprising the step of applying a curative to an adhesive surface of an article comprising an adhesive, said curative comprising a component selected from the group consisting of 2,4,5-triarylimidazole, bilophine and lophine radicals.  
   
   
       18 . A detackifying solution comprising a light-stable bilophine; a secondary or tertiary amine; and a suitable solvent.  
   
   
       19 . A fastening system comprising: 
 i) a two-part adhesive comprising a first part which comprises a light-stable isomer of a 2,4,5-triarylimidazolyl dimer and a second part which comprises a secondary or tertiary amine and a polymerizable material containing ethylenically unsaturated bonds, wherein said secondary or tertiary amine is N-methyl diethanolamine.    ii) a first element having a first surface bearing thereon the first part of the two-part adhesive; and    iii) a second element having a surface corresponding to and frictionally coupling with the first surface of the first element, which second element surface bears thereon the second part of the two-part adhesive;    wherein the first element and the second element are more securely fastened together relative to two such elements absent the two-part adhesive.