Allyl Diglycol Carbonate CR

Allyl diglycol carbonate (CR-39) is the most highly scratch resistant of the transparent plastics. Unlike most of the other transparent plastics that are TP, CR-39 is a TS plastic that has been in use for over a half century in applications such as bullet-proof shields, high temperature steel blast furnace eye and face guards, aircraft window side panels, etc. Processing methods include injection molding and casting. 

Dr. Crano received a B.S. degree in Chemistry in 1957 from Notre Dame and M.S. and Ph.D. degrees from Case Western Reserve University in 1959 and 1962, respectively. He joined PPG Industries in 1961, and had spent his entire career with that firm, at first in various roles in the Chemical Research Development area. In 1974 PPG began research upon means to impart photochromic properties to ophthalmic lenses made from plastics, in particular from poly(allyl diglycol carbonate), CR-39 . Plastic lenses command over 85% of the total ophthalmic market in the US, principally because a lightweight plastic product is more comfortable to wear and permits more attractive fashion designs. 

Allyl diglycol carbonate (CR-39) Polymethylmethacrylate (acrylic) (PMMA)... 

The resin allyl diglycol carbonate (CR-39 by PPG Industries, http //corporateportal.ppg.com/NA/ chemicals/Optical/CR39/) can be cast in a film form. It was developed in 1940 and is sold in monomer form. It is used to produce highly transparent plastics for optical applications, such as lenses for glasses. The following surface treatment method has been recommended. ... 

Other minor uses include bonding polyester laminates to polyester or to metal, and as adhesives for optical equipment. CR-39 allyl diglycol carbonate is an example of the latter. This material, in the cured condition, exhibits improved abrasion and chemical resistance over other transparent adhesive resins and displays the good heat resistance and dimensional stability associated with thermosetting systems. These properties are retained on prolonged exposure to severe environmental conditions. CR-39, which stands for Columbia Resin 39, is an allyl resin, a special type of unsaturated polyester. ... 

Polymeric materials used for the production of track-etched membranes include poly(ethylene terephthalate) (PET), polycarbonate (PC), polyimide (Kapton), polypropylene, polyvinylidene fluoride, and CR-39 (allyl diglycol carbonate) (29). The most widely used are PET, PC, and Kapton. 

There are various kinds of plastic material suitable for use as track-etch detector, of which LR 115 (cellulose nitrate), MAKROFOL (polycarbonate) and CR-39 (allyl-diglycol poly carbonate) are the most popular. These materials are described by Fantini and Richard (1981) and Cartwright et al. (1978). 

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