Water curable polyurethane compositions and uses thereof

Details Water curable polyurethane compositions and uses thereof Water curable polyurethane compositions and uses thereof

2005-03-22

2005-03-22

Niland, Patrick D. (Department: 1714)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C524S590000, C524S839000, C524S840000, C528S044000, C528S085000

Reexamination Certificate

active

06870000

ABSTRACT:
Increased health, safety, and environmental awareness motivated the development of new and improved water curing technology for formulating, manufacturing, and using water curable compositions (also referred to in the art as water induced urethanes). The present invention is based, at least in part, upon the concept of formulating NCO functional resins used in water curable compositions from one or more polyisocyanate constituents that comprise at least one sterically hindered isomer of diphenyl methane diisocyanate (MDI). These isomers have a combination of exceptionally low vapor pressure and suitable moisture reactivity that lead to numerous advantages. Due to their low volatility, these isomers may be substituted for all or a portion of the TDI content of a conventional water induced urethane formulation. Particularly preferred embodiments eliminate any TDI, have 100% solids, are solvent free, and are characterized by essentially zero VOC emissions with respect to isocyanate. The compositions are substantially more environmentally friendly than conventional formulations.

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