Radiation imagery chemistry: process – composition – or product th – Microcapsule – process – composition – or product
Patent
1993-12-01
1995-05-02
Bowers, Jr., Charles L.
Radiation imagery chemistry: process, composition, or product th
Microcapsule, process, composition, or product
430962, 430338, 503215, 2504741, 2504821, G03C 173
Patent
active
054118352
ABSTRACT:
The photochromatic indicator is a dry film comprised of microencapsulated chemistry which reacts to the degradation of the dry film components when irradiated by UVA and UVB in the frequency spectral range of 290 nm (low end of the UVB spectrum) to 365 nm (high end of the UVA spectrum). This degradation produces free hydrogen and chorine radicals which combine to form acidic byproducts of hydrogen chloride gas or hydrochloric acid.
The initial microencapsulation has an interior molecular grouping of acid sensitive dye and UVA and UVB absorbing chemistry surrounded by, and bonded to, a chlorinated rubber compound. This interior is then also microencapsulated by bonding a coating of polyvinylchloride (pvc) to the chlorinated rubber by using epoxide agents which, in turn, retard the degradation of both the pvc and the chlorinated rubber.
By varying the amount of epoxides in the bonding phase, the time for the dye to complete its full color change can be adjusted. The degradation is directly proportional to the cumulative amount of exposure to UVA and UVB, and is timed to a selected time interval for a full color change of the dye.
REFERENCES:
patent: 3743846 (1973-07-01), Matsumoto et al.
patent: 4788126 (1988-11-01), Feldman et al.
patent: 4918317 (1990-04-01), Hess et al.
patent: 5206118 (1993-04-01), Sidney et al.
patent: 5296275 (1994-03-01), Goman et al.
Bowers Jr. Charles L.
Knothe Charles S.
McPherson John A.
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