Oxazolidone ring containing adducts

Abstract

Embodiments include oxazolidone ring containing adducts obtainable by combining an aliphatic epoxy compound, an aromatic epoxy compound, and a diisocyanate. Embodiments further include a curable powder coating composition including a resin component and a hardener component, where the resin component includes the oxazolidone ring containing adduct.

What is claimed: 
     
         1 . An oxazolidone ring containing adduct obtainable by combining:
 an aliphatic epoxy compound;   an aromatic epoxy compound; and   a diisocyanate.   
     
     
         2 . The oxazolidone ring containing adduct of  claim 1 , where combining the aliphatic epoxy compound, the aromatic compound, and the diisocyanate includes a first stage and a second stage. 
     
     
         3 . The oxazolidone ring containing adduct of  claim 1 , where the aliphatic epoxy compound is 20 weight percent (wt %) to 60 wt % of a total weight of the oxazolidone ring containing adduct. 
     
     
         4 . The oxazolidone ring containing adduct of  claim 1 , where the oxazolidone ring containing adduct has an epoxide equivalent weight of 800 grams/equivalent (g/eq) to 1300 g/eq. 
     
     
         5 . The oxazolidone ring containing adduct of  claim 1 , where the aliphatic epoxy compound is selected from the group consisting of a diglycidyl ether of polypropylene glycol, 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, and combinations thereof. 
     
     
         6 . The oxazolidone ring containing adduct of  claim 2  where the first stage includes adding the aliphatic epoxy compound to the diisocyanate to obtain a first stage adduct. 
     
     
         7 . The oxazolidone ring containing adduct of  claim 2  where the second stage includes adding the aromatic epoxy compound to the first stage adduct to form the oxazolidone ring containing adduct. 
     
     
         8 . The oxazolidone ring containing adduct of  claim 1  where the aromatic epoxy compound is 20 wt % to 40 wt % of the total weight of the oxazolidone ring containing adduct. 
     
     
         9 . The oxazolidone ring containing adduct of  claim 1  where the diisocyanate is 10 wt % to 40 wt % of the total weight of the oxazolidone ring containing adduct. 
     
     
         10 . The oxazolidone ring containing adduct of  claim 1  where that the aliphatic epoxy compound, the aromatic epoxy compound, and the diisocyanate weight percents sum to 100 wt % of the oxazolidone ring containing adduct. 
     
     
         11 . The oxazolidone ring containing adduct of  claim 2  where the first stage adduct further includes a catalyst. 
     
     
         12 . The oxazolidone ring containing adduct of  claim 11  where the catalyst is selected from a group consisting of lithium compounds, boron trifluoride complex salts, quaternary ammonium salts, tertiary amines, phosphines, phosphonium salts, imidazoles, Lewis acids, Lewis bases, and combinations thereof. 
     
     
         13 . The oxazolidone ring containing adduct of  claim 12  where the catalyst is 1,8-diaza-bicyclo [5.4.0] undec-7-ene (DBU). 
     
     
         14 . The oxazolidone ring containing adduct of  claim 11  where the catalyst in the first stage is 20 parts per million (ppm) to 5,000 ppm based on the total weight of the aliphatic epoxy compounds and the diisocyanates. 
     
     
         15 . The oxazolidone ring containing adduct of  claim 1  where the aromatic epoxy compound is selected from the group consisting of a glycidyl ether of bisphenol A, a gylcidyl ether of bisphenol F, and combinations thereof. 
     
     
         16 . The oxazolidone ring containing adduct of  claim 1  where the diisocyanate is selected from the group consisting of 4,4′-diphenylmethane diisocyanate, toluene diisocyanate, isophorone diisocyanate, 4,4′-methylenebis(cyclohexylisocyanate), and combinations thereof. 
     
     
         17 . The oxazolidone ring containing adduct of  claim 1 , where the oxazolidone ring containing adduct has a melt viscosity at 150 degrees Celsius (° C.) of 2 pascal second (Pa·s) to 10 Pa·s. 
     
     
         18 . The oxazolidone ring containing adduct of  claim 1  where the oxazolidone ring containing adduct has a softening point of 80° C. to 100° C. 
     
     
         19 . The oxazolidone ring containing adduct of  claim 1  where the oxazolidone ring containing adduct has a glass transition temperature of 35° C. to 55° C.