Vanadyl phthalocyanine sulfonamides and laser protective plastic filters containing the same

Abstract

Abstract Vanadyl phthalocyanine sulfonamides of the formula: WHERE Pc is a phthalocyanine moiety, R and R'' are lower alkyl and x is an integer from 1 to 4; are incorporated into plastics to provide plastic compositions suitable for fabrication into devices, such as goggle lenses, capable of protecting the eye against laser radiation of from about 620 to 720 nanometers, e.g. the ruby laser (694 nm), the krypton laser (671 nm) and the helium-neon laser (633 nm). A typical composition consists of 75 parts poly(methyl methacrylate) syrup, 25 parts methyl methacrylate, 0.03 parts vanadyl phthalocyanine di-nbutylsulfonamide having 2.8 dibutyl sulfonamide radicals per mole of phthalocyanine, 0.2 part 2,2''-dihydroxy-4-methoxybenzophenone and 0.03 part azobisisobutyronitrile. A plate, 0.1 in. thick, cast-molded from said composition, exhibited an optical density at 694.3 nm of 5.5+ and a luminous transmittance of 47 percent. When exposed to a Q-switched ruby laser of 300 kilowatts per cm2 for 20 nanoseconds, the plate remains undamaged.

Inventors

• 👤 R Tucker

Bibliographic Details