Epoxy resins propane containing

Bisphenol-A (BPA) or 2,2-bis(4-hydroxyphenyl)propane is one of the highest volume chemicals produced worldwide, with a production volume of approximately 3.8 million tons in 2006 [199]. BPA is mainly used as monomer in the production of polycarbonate and epoxy resins. Polycarbonate is a transparent polymer with a high impact resistance which can be used in different consumer goods such as reusable drinking bottles and food containers. Epoxy resins on the other hand are used as inner coating of food and drink cans. Release and exposure of... 

The addition-reaction product of bisphenol A and glycidyl methacrylate or an epoxy resin and methacrylic acid is bis-GMA 2,2- 7Z5 4-(2-hydroxy-3-methacryloxypropoxy)phenyl propane (Fig. 5). Bis-GMA can therefore be classified as a dimethacrylated epoxy, although it does not contain a reactive epoxy group. Bis-GMA is the most commonly used prepolymer in dental composite restorative materials. Several similar compounds have also appeared as substitutes for Bis-GMA or in addition to it in dental resins. Such dimethacrylates based on bisphenol A with various chain lengths are bis-MA 2,2- fs(4-(metha-cryloxy)phenyl)-propane, bis-EMA 2,2-i7is(4-(2-met-hacryloxyethoxy)phenyl)-propane and bis-PMA 2,2- s(4-(3-methacryloxypropoxy)phenyl)-propane. 

Apart from epoxy resins, reactive diluents and epi-chlorohydrin, other compounds containing at least one epoxy group in their molecules are also potential causes of contact allergy. Examples of these epoxy compounds include glycidyl methacrylate (Matura et al. 1995 Fig. 6), epoxy propane [CAS 75-56-9] (Steinkraus and Hausen 1994 Morris et al. 1998), 2,3-epoxypropyl trimethyl ammonium chloride (EPTMAC) [CAS 3033-77-0] (Estlander et al. 1997) and trans-y (4-methoxyphenyl)glycidate (Buisson et al. 1991). 

The production of many organic compounds requires the chlorination of feedstock chemicals (Table 3.3). This yields untreated wastewater that contains significant amounts of chlorinated methanes, ethanes, propanes, ethylenes, and propylenes. Other related processes such as chlorohydrina-tion and oxychlorination result in similar wastewater products. Furthermore, the use of vinyl chloride in the production of acrylic fibers and polyvinyl chloride resins yields chlorinated ethanes and ethylenes, whereas the production of epoxy resins results in the formation of dichloropropane and dichloropropylene through the use of epichlorohydrin (Wise and Fahrent-hold, 1981). 

Epoxide resins are condensation products of substances containing the epoxy group (epichlorohydrin) with polyatomic phenols (4,4 -dihydroxy-diphenyl-2,2 -propane, resorcinol, etc.) and represent thermoplastic products with various softening points, depending on the ratio of the initial components and the conditions under which the condensation was conducted ... 

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