1,1,1-Trichloroethane → Methacrylic Acid

Participants

Reaction Steps

A solution of 15 g of a 9:1 copolymer of methyl methacrylate and methacrylic acid in 30 g of 2-butanone was prepared by warming at 45° for 0.5 hr. To this solution was added 90 g of 2-ethoxyethanol, 15 g of Epocryl® 12, 1.2 g of 2-o-chlorophenyl-4,5-diphenylimidazolyl dimer, 0.9 g of Michler's ketone, 0.06 g of Leuco Crystal Violet, 0.30 g of C.I. Solvent Red Dye #109 and 10 g of methyl chloroform, and the mixture was dissolved by rolling for 1 hour. After standing overnight the solution was filtered, and it was spin-coated onto a 15×20 inch (38.1×50.8 cm) anodized aluminum substrate (275 rpm for 2.0 minutes). The coated plate was air-dried at 100° for 5 minutes to give a coating weight of 68.6 mg/dm2. The plate was exposed through a process transparency for 1.0 minute to a Xenon flash lamp under vacuum to give good contact with the process transparency. (A Xenon flash Nu Arc plate maker was employed at 1 mm pressure; GEPXA Xenon bulb with 2500 watt input at a distance of 16.5 inches (42 cm) from the photopolymerizable layer was used.) The exposed plate was developed for 15 seconds with the development solution of Example 1, and a printing press was used to print 5000 copies from this lithographic plate. Excellent prints were obtained with no evidence of plate wear, and excellent dot size reproduction was also obtained.

Provenance & Evidence