Compositions – Light transmission modifying compositions – Displaying color change
Patent
1987-11-24
1990-06-05
Lee, Mary C.
Compositions
Light transmission modifying compositions
Displaying color change
524 83, 524 84, 524 89, 524 90, 524 92, 524 94, 524 95, 524 98, 524715, 524719, 524742, 524754, G02B 523
Patent
active
049312200
ABSTRACT:
Described is photochromic particulate material comprising a photochromic substance within a matrix of a polymerizate of a polyfunctional acrylate monomer. The photochromic particulate material may be produced by adding an organic photochromic substance to a polymerizable composition including a polyfunctional acrylate monomer and polymerizing the resultant admixture, e.g., by emulsion polymerization. In the case of emulsion or suspension polymerization, finely divided particulate organic photochromic materials are separated from the polymerization medium in the form of spheroidal thermoset photochromic particles of fairly uniform size. If desired, the particles recovered from the polymerization medium may be further ground in conventional attrition mills to further reduce the size of the particulate product. In the case of bulk polymerization, the polymerizate may be formed as a continuously cast sheet, which is then pulverized to a particulate material of pigmentary size.
REFERENCES:
patent: 2809954 (1957-10-01), Kazenas
patent: 2851424 (1958-09-01), Switzer
patent: 3100778 (1963-08-01), Berman
patent: 3212898 (1965-10-01), Cerreta
patent: 3216958 (1965-11-01), Sheld
patent: 3346385 (1967-10-01), Foris
patent: 3361706 (1968-01-01), Smith et al.
patent: 3412034 (1968-11-01), McIntosh et al.
patent: 3412035 (1968-11-01), McIntosh et al.
patent: 3562172 (1971-02-01), Ono et al.
patent: 3565814 (1971-02-01), Pellon
patent: 3578602 (1971-05-01), Ono et al.
patent: 4012232 (1977-03-01), Uhlmann et al.
patent: 4016133 (1977-04-01), Hyosu
patent: 4132561 (1979-01-01), Burke, Jr.
patent: 4215010 (1980-07-01), Hovey et al.
patent: 4220708 (1980-09-01), Heller
patent: 4342668 (1982-08-01), Hovey et al.
patent: 4405733 (1983-09-01), Williams et al.
patent: 4503177 (1985-03-01), Reid
patent: 4637698 (1987-01-01), Kwak et al.
Haynes Ronald L.
Hoelscher Charles H.
Lasch Jonathan G.
Kilby Scalzo Catherine S.
Lee Mary C.
PPG Industries Inc.
Stein Irwin M.
LandOfFree
Organic photochromic pigment particulates does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Organic photochromic pigment particulates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Organic photochromic pigment particulates will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-490343