UV Cured Indicating Devices
AssigneeJP Laboratories, Inc.
InventorGordhanbhai N Patel
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Abstract
This invention relates to thin indicating devices, such as time-temperature indicators and a method of making by applying and UV curing one or more layers of indicating composition are disclosed. For example, an indicator layer is applied on substrate and cured with UV light, immediately followed by an application of an activator layer which is cured by UV light. The device can have other layers, such as a permeable barrier between the activator and indicator layer and a top protective layers which are also UV cured. This fast curing method prevents premature reactions, e.g., diffusion of activator into indicator layer and vice versa during manufacturing.
Claims18
A method of making a time-temperature indicating device by
- (i) applying an indicator
- layer comprised of at least one UV curable binder and at least one indicator to a substrate;
- (ii) curing the layer with UV light
- (iii) applying an activator layer comprised
- of at least one UV curable binder and at least one activator on the indicator layer;
- (iv) curing the activator layer with UV light;
- (v) applying a UV curable protective layer;
- and
- (vi) UV curing the protective layer.
2-16. (canceled)
Time-temperature indicating device comprised of a substrate having thereon
- (i) an indicator layer comprised of at least one UV cured binder and at least one indicator;
- ii) an activator layer comprised of at least one UV cured binder and at least one activator;
- and
- (iii) a protective layer.
An indicating device comprised of a substrate having thereon a layer comprising a UV cured binder comprising solid particles of an indicator and solid particles of an activator.
A water or solvent based indicating ink comprising a binder comprising solid particles of an indicator and solid particles of an activator.
A time-temperature indicating device comprising at least one substantially opaque reactant wherein the reaction or the color development occurs on the surface of the reactant.
Dependencies are inferred from the claim text.