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NMP-free polyurethane dispersions

Many polyurethane dispersions contain N-methyl pyrrolidone (NMP), because it is often a required part of the production process, while also facilitating film formation. California Proposition 65 and European legislation require special labeling for products containing NMP. For example in Europe, due to the hazard reclassification of NMP, products containing 5% or more NMP will have to be labeled as being irritant and toxic "T". Bayer MaterialScience has been producing and marketing solvent-free dispersion based on the acetone process for decades already and nowadays all solvent-free dispersions - existing and newly developed - are produced in this process. So for Bayer MaterialScience going without NMP in production has been easy.

The Bayhydrol® product range now includes many solvent-free polyurethane dispersions for most applications polyurethane dispersions are commonly used in. The main reason for still using solvents in the paint formulations is to support film-building properties. In many cases, the total solvent content of an NMP-free formulation, however, is substantially lower compared to conventional formulations.

NMP-free polyurethane-dispersions

Product	Main substrate / Application
Bayhydrol® UH 340/1	plastic, flexibilization of hard PAC and PUR dispersions
Bayhydrol® UH 650	plastic
Bayhydrol® UH 2557	wood
Bayhydrol® UH 2558	wood, PVC
Bayhydrol® UH 2593/1	wood
Bayhydrol® UH 2606	plastic and others
Bayhydrol® UH 2621	basecoat metal / plastic
Bayhydrol® UH 2952/1	basecoat metal / plastic
Bayhydrol® UH XP 2592	industrial metal
Bayhydrol® UH XP 2648	plastic
Bayhydrol® UH XP 2719	wood
Bayhydrol® U XP 2698	plastic
Bayhydrol® U XP 2757	plastic
Impranil® DLU	textile
Impranil® DLC-F	textile
Impranil® DL 2611	textile
Baybond® PU 330	glass fiber sizing
Baybond® PU 405	glass fiber sizing
Baybond® PU 406	glass fiber sizing