2- Propanol odor caused

As a conclusion it results that neither the suspected methoxy propanol nor the MEK used as solvent could contain a high enough concentration of the off-odor-caus-ing ketone. The off-odor developed first after printing and subsequent evaporation of the solvent. Because of its relatively low solubility and good solubility in the plastic the unsaturated ketone was slowly set free during further storage of the packaging. 

Properties Pale yel. liq. mild odor sol. in ethanol, 2-propanol, water dens. 1000 kg/m (20 C) m.p. < -10 C flash pt. > 100C pH 6-8 (1% aq.) 69-71% act. Toxicology Avoid contact with skin and inh. of vapors Storage 1 yr. shelf life when stored R.T. in sealed, undamaged containers avoid high temps. storage below m.p. will cause separation or solid.—melt and homogenize before use... 

All polymers must be checked for the presence of residual monomers, which by their nature are reactive, toxic materials. During manufacture, other low molecular weight materials may be unintentionally synthesized from EO and PO, such as acetaldehyde and 1,4-dioxane (from EO), and propionaldehyde, allyl alcohol, allyloxy-2-propanol, and substituted dioxolanes (from PO). Good manufacturing practice requires that these low molecular weight compounds be vacuum stripped from the surfactant at the end of the alkoxylation reaction. Generally, the presence of a high level of one of these is associated with the presence of others, so that it is not necessary to determine each individually for routine quality control. Dioxanes and dioxolanes from surfactant synthesis seem not to be the cause of odor complaints, unlike the similiar family of compounds produced as a byproduct of polyester resin manufacture (52,53). 

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