Polyurethanes are the fastest growing segment of the coating industry. Although the common approach to prepare polyurethanes is from isocyanates, there are also non-isocyanate processes to prepare polyurethanes.

Polyurethanes Polyols as Reactive Diluents
There are many potential technologies of preparing reactive diluents for coatings. Low molecular weight polyurethane diols have the advantage of good water solubility and excellent hydrolytic stability. Reaction of an amine with a cyclic carbonate represents a low cost route to polyurethanes. 


Non-isocyanate routes to polyurethane crosslinker Hydroxyalkylcarbamate containing resins for cationic electrocoating and method of making the same
Reactive diluent waterborne coatings Hydroxyalkyl Carbamate Diluent for Coating Compositions and Compositions Containing the Same
More polyurethane diluents Certain hydroxyalkylcarbamates, polymers and uses thereof.
Automotive clearcoats Acid Etch Resistant Automotive Topcoats
Hydroxyalkyl carbamate crosslinker Crosslinking with Polyurethanes.
Melamine crosslinking of PU emulsions Crosslinking of Water-Borne Polyurethane Dispersions
Catalysts for waterborne 2K coatings. Catalysis of the Isocyanate-Hydroxyl Reaction by Non-Tin Catalysts
Catalyst for Blocked Isocyanates Organotin free catalysts 
Waterborne 2K coatings Selective catalyst for isocyanate crosslinked 2k
Ideas for New Uses of Urethanes and Isocyanates (Disclaimer please read it)
Polyurethane polyols
Polyurethane polyols with good solubility in conventional solvents can be prepared by from K-FLEX UD-320-100 urethane diol (King Industries) by self-condensation. A good catalyst is potassium hydroxide (50-100 pm). Vacuum is required to remove the propylene glycol. A reaction temperature of 150-170C is necessary. The resulting polymer crosslinked with HMMM gives an excellent combination of hardness, flexibility and chemical resistance. Exterior durability is outstanding.
Crosslinking with K-FLEX UD-320
UD-320 can be considered a propylene glycol blocked isocyanate (see paper below). In presence of a catalyst (K-KAT 348) can react with hydroxyl functional polymers at 160C or higher. Because of the difunctionality of the urethane diol the polymer backbone has to be multifunctional. Hydroxyl functional acrylic resins and epoxy resins can be used. If you are interest in a starting formulation give me a call.
For commercial information, datasheet and sample see King Industries Inc.


Polyurethane preparation Non-Isocyanate Routes to Polyurethanes
Preparation of Aqueous PU Preparation by Isocyanate and Non-Isocyanate Routes
Crosslinking with blocked NCO Crosslinking with Polyurethanes
Electrocoating blocked NCO Hydroxyalkylcarbamates as crosslinker for cationic EC
Covalent blocked sulfonic acids Polyurethane modified co-valent blocked sulfonic acid

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