Liquid pigment dispersion and curative agents

Abstract

A liquid pigment dispersion is disclosed. The dispersion comprises a pigment dispersed in a blend of two or more active hydrogen-containing materials that together have a freezing point that is room temperature or below. The pigment remains dispersed in the blend, even if the dispersion is subjected to freezing and thawing. A curative blend comprising at least two active hydrogen-containing materials, which is liquid at room temperature, is also disclosed. The dispersions and curative blends of the present invention can be solvent-free. Resins and prepolymers comprising the curative blends of the invention, either pigmented or unpigmented, are also disclosed.

1 - 31 . (canceled)  
   
   
       32 . A prepolymer formed from the reaction between a diisocyanate, a polyol and/or a polyamine, and a pigment dispersion, wherein the pigment dispersion is liquid at room temperature and below and comprises a pigment dispersed in a blend of two or more active hydrogen-containing materials, wherein each active hydrogen-containing material may have a different freezing point.  
   
   
       33 . A polyurethane prepolymer formed from the reaction between a diisocyanate, a polyol, and a curative blend comprising: (a) a first active hydrogen-containing material and (b) a second active hydrogen-containing material, wherein the active hydrogen-containing materials have different freezing points, and the freezing point of the blend is 60° F. or less.  
   
   
       34 . The prepolymer of  claim 32 , wherein said prepolymer is saturated.  
   
   
       35 - 36 . (canceled)  
   
   
       37 . The prepolymer of  claim 33 , wherein the diisocyanate is diphenylmethane diisocyanate and the polyol is polyalkylene glycol.  
   
   
       38 . The prepolymer of claim  36 , wherein the diisocyanate is 4,4′-dicyclohexylmethane diisocyanate and the polyamine is polyalkylene diamine.  
   
   
       39 . The prepolymer of  claim 32 , wherein the prepolymer is a polyurethane prepolymer.  
   
   
       40 . The prepolymer of  claim 32 , wherein the prepolymer is a polyurea.  
   
   
       41 . The prepolymer of  claim 33 , wherein the prepolymer is a polyurethane prepolymer.  
   
   
       42 . The prepolymer of  claim 33 , wherein the prepolymer is a polyurea.  
   
   
       43 . The prepolymer of  claim 32 , wherein each active-hydrogen containing material has a different freezing point.  
   
   
       44 . The prepolymer of  claim 43 , wherein a first active hydrogen-containing material is solid at room temperature and a second active hydrogen-containing material is liquid at room temperature.