Advances in Polyurethane Coatings (1969 to Early 1972)

Abstract

He holds a Ph.D. degree in organic chemistry from Northwestern University and is author of some fifteen papers and an inventor or coinventor of some fifty patents. He is a member of American Chemical Society, The Chemical Society (London), The Society of the SigmaXi, andNew York Academy of Science.

Blocked isocyanates: from analytical and experimental considerations to non-polyurethane applications

“…Indeed, in their study involving the reaction of different substituted phenyl isocyanates with alcohols, Bailey and co-workers noted that both nitrile and chlorine substituted phenyl isocyanate had much greater rates of reaction than that of the methyl groups which exhibited an inhibiting effect on the reaction. 111 Lee et al further elaborated whilst reporting the deblocking of H 12 -MDI, 24,67 Generally found to have high deblocking temperatures. The presence of halogens found to significantly decrease the deblocking temperature.…”

Flame-Retardant Organic Coatings

“…The mechanisms of cure of these coatings have recently been reviewed. (24) Urethane alkyds generally undergo air oxidation of double bonds to form cross-linked films. They are prepared by reacting an alcoholized drying oil (i.e .. the reaction product of polyol and unsaturated fatty acid) and a polyisocyanate to form urethane groups.…”

Effect of Urethane Crosslinking by Blocked Isocyanates with Pyrazole-Based Blocking Agents on Rheological and Mechanical Performance of Clearcoats

“…Automotive clearcoat systems based on urethane-bonded polymer networks via thermal curing have been widely used to fabricate cured coating layers because of their excellent properties such as resistance to solvents and other chemicals as well as outstanding stability and durability [24,25]. The blocked isocyanate (BI) crosslinker involved in such systems is typically prepared by blocking the isocyanate functionality using suitable materials (i.e., blocking agents), which prevent the active isocyanate groups from reacting with water molecules or nucleophiles [26][27][28].…”