Oxazolidines as Latent Curing Agents

Tuesday, July 19, 2011

Polyurethane Dispersions – A feasible substitute for solvent-based analogs

Over the past few years, there has been tremendous growth in the use of polyurethane dispersions as they are found to be the best and safest replacement for solvent-based coatings along with their environment friendliness.
Also known as PUDs, waterborne polyurethane dispersions are an important ingredient of the polyurethane coating industry which has become popular due to ongoing environment legislations such as the Clean Air Act. There are several advantages associated with their usage.

They are flexible and comfortably comply with the related environment regulations. Moreover, they come in a great variety of hardness and solid content. Their zero to low volatile organic content facilitates their formulation into a compliant coating for many different substrates. Their versatility and wide range of superior properties, such as abrasion resistance, impact strength and low temperature flexibility are the driving forces to their continuously expanding usage in many applications.

Polyurethane dispersion are generally completely reacted polyureas of small and discrete polymer particles ranging from 0.01 – 5.0 microns in a regular water phase. They do not contain isocyanate residues and have a zero or a very low volatile organic content (VOC). Nevertheless, they are safe to handle and are a good choice for compliant coatings.

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