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US 4,365,012 AGranted
Light sensitive recording material
AssigneeAgfa-Gevaert
InventorsJurgen Hocker, Erwin Ranz
Life of this patent
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Abstract
The light sensitive recording material which is suitable for use as recording material in computers and oscillographs contains as light sensitive substance a photochromic film forming cyclic polyimide compound.
Claims3
A process for producing reversible images in a light-sensitive recording material which comprises the step of imagewise exposing to light, a supported layer containing a light-sensitive substance corresponding to the formula ##STR19## in which R represents a divalent aliphatic group containing an electron donor function;
- R.sup.1 represents hydrogen, halogen, SO.sub.3 H, CN, COOR.sup.2, N(R.sup.3).sub.2, OR.sup.4, or NO.sub.2 ;
- R.sup.2, R.sup.3, and R.sup.4 represent hydrogen or C.sub.1 -C.sub.6 alkyl and
- n represents an integer of from 2 to 1,000 and subsequently reverting said recording material to a monochromatic state.
Dependencies are inferred from the claim text.