Time-temperature indicator devices
First Claim
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1. A time-temperature indicator device comprising:
- a non-adhesive polymeric layer having a first and a second surface and being formed from a natural synthetic rubber polymer or copolymer comprising polymerised diene units, the non-adhesive polymeric layer containing a masking agent thereby rendering said polymeric layer opaque;
a dye composition adhered to said first surface comprising a water-insoluble dye arranged such that as a result of a cumulative time-temperature exposure said dye composition diffuses through said non-adhesive polymeric layer, the masking agent obscuring the dye until it has migrated through the non-adhesive polymeric layer; and
, a transparent support layer arranged to carry said non-adhesive polymer layer to facilitate visualization of the dye composition upon sufficient time-temperature exposure.
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Abstract
A time-temperature indicator device comprises a polymeric layer having a first and second surface and a dye composition adhered to said first surface comprising a dye which diffuses into the polymeric layer as a result of a cumulative time-temperature exposure wherein the polymeric layer is formed from a natural or synthetic rubber polymer or copolymer. The device may be attached to a product for monitoring cumulative time-temperature exposure.
57 Citations
13 Claims
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1. A time-temperature indicator device comprising:
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a non-adhesive polymeric layer having a first and a second surface and being formed from a natural synthetic rubber polymer or copolymer comprising polymerised diene units, the non-adhesive polymeric layer containing a masking agent thereby rendering said polymeric layer opaque;
a dye composition adhered to said first surface comprising a water-insoluble dye arranged such that as a result of a cumulative time-temperature exposure said dye composition diffuses through said non-adhesive polymeric layer, the masking agent obscuring the dye until it has migrated through the non-adhesive polymeric layer; and
,a transparent support layer arranged to carry said non-adhesive polymer layer to facilitate visualization of the dye composition upon sufficient time-temperature exposure. - View Dependent Claims (2, 3, 4, 5, 6, 12, 13)
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7. A method of forming a time-temperature indicator comprising the steps of:
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coating a layer of an aqueous emulsion of a natural or synthetic rubber polymer or copolymer comprising polymerised diene units on a transparent support, the layer including a masking agent thereby rendering the layer opaque;
drying the layer to form a non-adhesive polymeric layer and applying to the surface of the polymeric non-adhesive layer a dye composition comprising a water-insoluble dye arranged such that as a result of a cumulative time-temperature exposure said dye composition diffuses through the non-adhesive polymeric layer, the masking agent obscuring the dye until it has migrated through the non-adhesive polymeric layer. - View Dependent Claims (8, 9, 10, 11)
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Specification