Catalysis of the isocyanate-hydroxyl reaction by non-tin catalysts

On the Versatility of Urethane/Urea Bonds: Reversibility, Blocked Isocyanate, and Non-isocyanate Polyurethane

“…Isocyanate−hydroxyl reaction is also favored over the water−isocyanate one in the presence of zirconium chelates. 40 3.2.4. Reaction in Water: Waterborne Coatings.…”

Thermal Analysis of Polyurethane Dispersions Based on Different Polyols

“…The relative selectivity (S) obtained from equation S = Purethane/Purea, was measured as urethane IR peak area (Purethane)/ urea IR peak area (Purea) ratio, by method given by Blank (Blank et al, 1999). After the integration of characteristic absorption max of urethane (1700 cm -1 , 1540 cm -1 ) and urea (1640 cm -1 , 1570 cm -1 ) was done, the relative selectivity was calculated.…”

“…After the integration of characteristic absorption max of urethane (1700 cm -1 , 1540 cm -1 ) and urea (1640 cm -1 , 1570 cm -1 ) was done, the relative selectivity was calculated. The manganese catalyst, a complex of Mn(III)-diacetylacetonatomaleate with various ligands based on acetylacetonate and maleic acid, used in some of the experiments (Stamenković et al, 2003;Cakić et al, 2006), has shown a high selectivity for the isocyanatehydroxyl reaction in comparison to the commercially available zirconium catalyst (Blank et al, 1999). Zirconium catalyst is a proprietary zirconium tetra-dionato complex in the reactive solvent with the metal content of 0.4%.…”

Immobilization of Styrene-acrylamide Co-polymer on Either Silica Particles or Inner Surface of Silica Capillary for the Separation of D-Glucose Anomers

“…29,30 There have been some reports on catalytic effects of organometallic compounds for isocyanate-hydroxyl reaction in homogeneous systems. 31 The idea of using similar catalysts in a heterogeneous isocyanatehydroxyl reaction as in that study led us to carry out the reaction between 4-chloromethylphenylisocynate (4-CPI) and silica silanol groups with some catalyst. Dibutyl tin dichloride (DBTDC) was chosen for its good solubility in the reaction solvent.…”