Vencorex: Hexachlorobenzene-free Isophorone diisocyanate
Vencorex has announced the launch of Hexachlorobenzene-free Isophorone diisocyanate (HCB-free IPDI). According to the company, for some decades Isophorone diisocyanate (IPDI) has been increasingly used in polyurethane chemistry applicable in many related industries, namely, coatings, adhesives, inks, and elastomers. Being a cycloaliphatic isocyanate with different reactivities between two isocyanate functions, IPDI does not only pertain high lightfastness as any aliphatic isocyanates, but it also provides good selectivity in urethane reactions, leading to good control of polymeric chain length and consequently suitable mechanical and chemical properties.
Polyurethane materials based on IPDI are often related to human-contact applications, e.g., inks for food packaging, adhesives for sport shoes, and top-coats for electronic appliances as well as wood furniture. Therefore, it is ideal to avoid any carcinogenic contaminants, even at ppm levels, such as notable contaminant hexachlorobenzene (HCB), which is difficult to totally eliminate in IPDI or polyurethane production.
Historically, HCB had many uses in agriculture; the major agricultural application for HCB used to be as a seed dressing for crops such as wheat, barley, oats, and rye to prevent growth of fungi. The use of HCB in such applications was banned in many countries in the 1970s due to concerns about adverse effects on the environment and human health. Today, it remains mostly as a by-product or impurity in some pesticides and other chemicals.
According to the Stockholm Convention on Persistent Organic Pollutants, HCB is found to be hazardous for all living organisms and reasonably anticipated to be a human carcinogen leading to being banned for commercial usages globally. Its carcinogenicity has been addressed by many organisations, most recent by the Classification, Labelling and Packaging (CLP) of the European Union as class 1B – H350 (may cause cancer). Consequently, prominent leather and textile associations and many related companies such as Oeko-Tex and Nike have restricted to 1 ppm maximum presence of total chlorinated benzene including HCB in the final products.
Vencorex said that in response to the increasing safety concerns, the company ensures that its IPDI is free from this carcinogenic compound and can be recommended for food and human-contact applications. As a leading producer of aliphatic diisocyanates and their derivatives, the company is highly committed to offer safe and environmentally friendly products to its customers. To illustrate this, Vencorex said it was pioneering in launching Tolonate X FLO 100, a partially bio-based isocyanate derivative, in 2013, and since 2016 the company has been rated with the Gold Medal from EcoVadis rewarding world class management system, sustainable development, and Corporate Social Responsibility.