Diethylene glycol bis

Ahyl alcohol undergoes reactions typical of saturated, aUphatic alcohols. Ahyl compounds derived from ahyl alcohol and used industriahy, are widely manufactured by these reactions. For example, reactions of ahyl alcohol with acid anhydrides, esters, and acid chlorides yield ahyl esters, such as diahyl phthalates and ahyl methacrylate reaction with chloroformate yields carbonates, such as diethylene glycol bis(ahyl carbonate) addition of ahyl alcohol to epoxy groups yields products used to produce ahyl glycidyl ether (33,34). 

DADC Monomers. Reaction of aHyl alcohol in the presence of alkaU with diethylene glycol bis(chloroformate), obtained from the glycol and phosgene, gives the monomer... 

Fig. 1. Bulk polymerization of diethylene glycol bis(aHylcarbonate) at 45°C with initial addition of 3.0% diisopropyl percarbonate. Rates of polymerization as measured by density and catalyst consumption decrease with time at a given temperature (14).

Diethylene glycol bis (chloroformate) [106-75-2] is the starting material for diethylene glycol bis(allyl carbonate) [142-22-3] CR-39, or Nouryset 200, monomer, used in the manufacture of break-resistant optical lenses, which is obtained by the reaction with aHyl alcohol [107-18-6] (59). Alternatively, it can be obtained from aHyl chloroformate [2937-50-0] and diethylene glycol (60) (see Allylmonomers and polymers). 

Diethylene glycol bis(allylcarbonate). Diethylene glycol bis(tolylcarbonate). 

Dimethyl and diethyl carbonates ate shipped in nonretumable 208-L (55-gal) polyethylene dmms with carbon steel overpack or high density polethylene dmms. For bulk shipments, insulated stainless steel tank containers and tmcks provide secure protection. Diethylene glycol bis(aHyl) carbonate is shipped in dmms as above. 

Unlike chloroformates, diethyl and dimethyl carbonates are only mildly irritating to the eyes, skin, and mucous membranes. Diethylene glycol bis(aHyl carbonate) may be irritating to the skin, but it is not classified as a toxic substance however, it is extremely irritating to the eyes. 

Polymers of diethylene glycol bis(a)lyl carbonate) (CR-39) are optically clear infusible polymers which are used for lenses. 

The low refractive index monomer, diethylene glycol bis allyl carbonate, was prepared by Khandel et al. (4) and used in plastic ophthalmic lenses. 

The most commonly used diallyl monomer is diallyl diethylene glycol carbonate, DADC or CR 39, developed for preparing clear, colorless, abrasion- and heat-resistant polymers (Table 2.29). DADC is obtained by reaction of diethylene glycol bis(chloroformate) with allyl alcohol, or allyl-chloroformate and diethylene glycol. 

Figure 9.2 Structure of diethylene glycol bis (allyl carbonate).

The DHI s may be absorbed into the surface of a polymer. For example, CR 39 (diethylene glycol-bis-alkyl-carbonate) with absorbed DHI is used as a light filter... 

These discussions have been extended to the bulk polymerizations of diallyl adipate (DAA), diethylene glycol bis (allyl carbonate) (DEGBAC), and diallyl diphenate (DAD) accompanied by a greatly delayed gelation The monomer type, actual gel point (%), theoretical gel point (%) are, respectively, as follows DAA, 25.6, 3.6 DEGBAC, 23.0, 3.7 DAD, 29.2, 3.4. 

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