Detail of "4222-20-2"

Reference

Polyurethane laminates for photochromic lenses

Some chemicals with cas registry numbers like 4222-20-2 and 9004-34-6 are also used. Polyurethane laminates for photochromic lenses. Maki, Alan; Woelfle, Eric; Kroulik, Darrell; Sugimura, Hideyo; Qin, Xuzhi (BMC Industries, Inc., USA). PCT Int. Appl. WO 2004011235 A1 5 Feb 2004, 35 pp. DESIGNATED STATES: W: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, MZ, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RU, SC, SD, SE, SG, SK, SL, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, UZ, VC, VN, YU, ZA, ZM, ZW; RW: AT, BE, BF, BJ, CF, CG, CH, CI, CM, CY, DE, DK, ES, FI, FR, GA, GB, GR, IE, IT, LU, MC, ML, MR, NE, NL, PT, SE, SN, TD, TG, TR. (English). (World Intellectual Property Organization). CODEN: PIXXD2. CLASS: ICM: B29D011-00. ICS: B32B027-40. APPLICATION: WO 2003-US23744 30 Jul 2003. PRIORITY: US 2002-PV400345 31 Jul 2002; US 2003-630277 30 Jul 2003. DOCUMENT TYPE: Patent CA Section: 38 (Plastics Fabrication and Uses) Section cross-reference(s): 73 A photochromic polyurethane laminate that is constructed to solve certain manufg. difficulties involved in the prodn. of photochromic lenses is disclosed. The photochromic laminate includes at least two layers of a transparent resinous material and a photochromic polyurethane layer that is interspersed between the two resinous layers and which contains photochromic compds. The photochromic layer has a thickness of from 5 pm to 80 pm. The photochromic host material may be a thermoset or thermoplastic polyurethane. A laminate of this construction can be conveniently incorporated into a plastic lens through an insert injection molding process. .

The relationship between the structure and the absorption spectra of naphtho[2,1-b]pyran

The relationship between the structure and the absorption spectra of naphtho[2,1-b]pyran. Kumar, Anil (PPG Industries, Inc., Monroeville, PA 15146, USA). Molecular Crystals and Liquid Crystals Science and Technology, Section A: Molecular Crystals and Liquid Crystals, 297, 139-145 (English) 1997 Gordon & Breach. CODEN: MCLCE9. ISSN: 1058-725X. DOCUMENT TYPE: Journal CA Section: 74 (Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes) The absorption wavelengths of methoxy substituted 3,3-diaryl-naphtho[2,1-b]pyrans in the open and closed forms were calcd. and compared to obsd. values. The obsd. and calcd. absorption wavelengths showed good correlation. The mol. geometries were minimized and electronic spectra were calcd. 4222-20-2 is the cas registry number. 4222-20-2 are also occured in this study. This chemical is also mentioned in this article. using ZINDO methods. ..