Acid chlorides, such as, benzoyl chloride delay the time of curing. However, it is not complete retard, meaning that the pre polymer is not stable at the storage. may improve packaging stability of the pre polymer.

I reduces the amount of residual organic diisocyanate monomer in a polyurethane prepolymer reaction product mixture.

Any Bronsted or Lewis acids works as inhibitor of unwanted reactions (e.g. allophanate/biuret reactions)? What is the mechanism?

Thanks for the contributions Professors Shavandi and Murillo!