Ultraviolet radiation monitoring device and use thereof

• US 5,612,541 A
• Filed: 05/22/1995
• Issued: 03/18/1997
• Est. Priority Date: 05/22/1995
• Status: Expired due to Fees

• Current Assignee: Moore Wallace
• Original Assignee: Wallace Computer Services, Inc. (RR Donnelley & Sons Company)
• Inventors: Hoffmann, Donald J., Chang, John C. H.
• Primary Examiner(s): FIELDS, CAROLYN
• Application Number:
  US08/446,311
• Time in Patent Office: 666 Days
• Field of Search: 250/474.1
• US Class Current: 250/474.1
• CPC Class Codes: G01J 1/50 using change in colour of an indicator, e.g. actinometer

Abstract

An ultraviolet radiation monitoring kit comprising at least one first substrate and at least one second substrate, the second substrate being capable of being closely associated with at least one first substrate, the first substrate having an indicator area comprising a chromogenic composition, the chromogenic composition comprising (a) the colored reaction product of a chromogen and a color developer, the colored reaction product being capable of changing color when exposed to ultraviolet radiation, or (b) a substantially colorless mixture of a chromogen and a color developer capable of reacting to form color when exposed to ultraviolet radiation, the second substrate bearing a reference color chart, the reference color chart comprising at least one reference color corresponding to time exposure to ultraviolet radiation, such that comparison of the color developed by the chromogenic composition upon exposure to ultraviolet light with a reference color provides an indication of the time and degree of exposure to ultraviolet radiation.

Claims

1. An ultraviolet radiation monitoring kit comprising:

at least one first substrate and at least one second substrate, said at least one second substrate being capable of being closely associated with at least one said first substrate,

said at least one first substrate having a first surface bearing an indicator area comprising a chromogenic composition, said chromogenic composition comprising (a) the colored reaction product resulting from contact between a chromogen and a color developer, said colored reaction product being capable of changing color when exposed to ultraviolet radiation, or (b) a substantially colorless mixture of a chromogen and a color developer capable of reacting to form color when exposed to ultraviolet radiation,

said at least one second substrate having a first surface bearing a reference color chart, said reference color chart comprising a plurality of reference colors, each of said reference colors corresponding to a different time exposure to ultraviolet radiation, such that comparison of the color developed by said chromogenic composition upon exposure to ultraviolet light with a reference color provides an indication of the time and degree of exposure to ultraviolet radiation.

2. The kit of claim 1, wherein said chromogenic composition comprises the colored reaction product of a chromogen and a color developer.

3. The kit of claim 2, wherein said chromogen is an aminofluoran and said color developer is a Lewis acid having poor color stability.

4. The kit of claim 3, wherein said color developer is silica, attapulgite clay or zinc oxide.

5. The kit of claim 2, wherein said color developer is incorporated in said at least one first substrate and said colored reaction product is formed by contacting said first surface of said at least one first substrate with a solution of said chromogen.

6. The kit of claim 5, wherein said color developer is silica.

7. The kit of claim 2, wherein said first surface of said colored reaction product being formed by providing said at least one first substrate with a coating of pressure rupturable microcapsules containing a chromogen, incorporating said color developer in said at least one first substrate, and thereafter applying pressure to said pressure rupturable microcapsules to release said chromogen for reaction with said color developer.

8. The kit of claim 1, wherein said chromogenic composition comprises a substantially colorless mixture of a chromogen and a color developer capable of reacting to form color when exposed to ultraviolet radiation.

9. The kit of claim 8, wherein said chromogen is a substantially colorless, solid fluoran and said color developer is silica.

10. The kit of claim 9, wherein said substantially colorless mixture additionally comprises a sensitizer.

11. The kit of claim 10, wherein said sensitizer comprises a benzophenone.

12. The kit of claim 1, wherein said at least one first substrate has a second surface bearing a pressure sensitive adhesive.

13. The kit of claim 12, wherein said at least one first substrate is superposed over multiple substrates each provided with said indicator area and together forming a disposable multiply tear-off pad.

14. The kit of claim 1, wherein a protective polymeric coating is provided over said chromogenic composition.

15. The kit of claim 1, wherein a third substrate is capable of being closely associated with said at least one first substrate and superposable over said indicator area, said third substrate being impenetrable to ultraviolet radiation.

16. An ultraviolet radiation monitoring device comprising:

a first substrate having a first surface bearing an indicator area comprising a chromogenic composition, said chromogenic composition comprising (a) a substantially colorless mixture of a chromogen and a color developer capable of reacting to form color when exposed to ultraviolet radiation, or (b) the colored reaction product resulting from contact between a chromogen and a color developer, said colored reaction product being capable of changing color when exposed to ultraviolet radiation,

said first substrate bearing a reference color chart adjacent said indicator area, said reference color chart comprising a plurality of reference colors, each of said reference colors corresponding to a different time exposure to ultraviolet radiation, such that comparison of the color developed by said chromogenic composition upon exposure to ultraviolet light with a reference color provides an indication of the time and degree of exposure to ultraviolet radiation.

17. A method of determining the time and degree of exposure to ultraviolet radiation which comprises:

placing an ultraviolet radiation monitoring device in the vicinity of an area to be monitored,

said ultraviolet radiation monitoring device comprising at least one first substrate and at least one second substrate, said at least one second substrate being capable of being closely associated with at least one first substrate,

said at least one first substrate having a first surface bearing an indicator area comprising a chromogenic composition, said chromogenic composition comprising (a) the colored reaction product resulting from contact between a chromogen and a color developer, said colored reaction product being capable of changing color when exposed to ultraviolet radiation, or (b) a substantially colorless mixture of a chromogen and a color developer capable of reacting to form color when exposed to ultraviolet radiation,

said at least one second substrate having a first surface bearing a reference color chart, said reference color chart comprising a plurality of reference colors, each of said reference colors corresponding to a different time exposure to ultraviolet radiation, such that comparison of the color developed by said chromogenic composition upon exposure to ultraviolet light with a reference color provides an indication of the time and degree of exposure to ultraviolet radiation,

exposing said ultraviolet radiation monitoring device to ultraviolet radiation,

periodically comparing the color of said chromogenic composition with a color on the reference color chart to determine the degree of exposure to ultraviolet radiation.

18. An ultraviolet radiation monitoring kit comprising:

at least one first substrate and at least one second substrate, said at least one second substrate being capable of being closely associated with at least one said first substrate,

said at least one first substrate having a first surface bearing an indicator area comprising a chromogenic composition, said chromogenic composition having a base color which is the colored reaction product resulting from contact between a chromogen and a color developer, said colored reaction product being capable of fading to a different color when exposed to ultraviolet radiation,

said at least one second substrate having a first surface bearing a reference color chart, said reference color chart comprising at least one reference color corresponding to time exposure to ultraviolet radiation, such that comparison of the color developed by said chromogenic composition upon exposure to ultraviolet light with a reference color provides an indication of the time and degree of exposure to ultraviolet radiation.

19. The kit of claim 18, wherein said.chromogen is an aminofluoran and said color developer is a Lewis acid having poor color stability.

20. The kit of claim 19, wherein said color developer is silica, attapulgite clay or zinc oxide.

21. The kit of claim 18, wherein said color developer is incorporated in said at least one first substrate and said colored reaction product is formed by contacting said first surface of said at least one first substrate with a solution of said chromogen.

22. The kit of claim 21, wherein said color developer is silica.

23. The kit of claim 18, wherein said first surface of said colored reaction product being formed by providing said at least one first substrate with a coating of pressure rupturable microcapsules containing a chromogen, incorporating said color developer in said first substrate, and thereafter applying pressure to said pressure rupturable microcapsules to release said chromogen for reaction with said color developer.

24. The kit of claim 18, wherein said at least one first substrate has a second surface bearing a pressure sensitive adhesive.

25. The kit of claim 24, wherein said at least one first substrate is superposed over multiple substrates each provided with said indicator area and together forming a disposable multiply tear-off pad.

26. The kit of claim 18, wherein a protective polymeric coating is provided over said chromogenic composition.

27. The kit of claim 18, wherein a third substrate is capable of being closely associated with said at least one first substrate and superposable over said indicator area, said third substrate being impenetrable to ultraviolet radiation.

28. An ultraviolet radiation monitoring device comprising:

a first substrate having a first surface bearing an indicator area comprising a chromogenic composition, said chromogenic composition comprising the colored reaction product of a chromogen and a color developer, said colored reaction product being capable of fading to a different color when exposed to ultraviolet light,

said first substrate bearing a reference color chart adjacent said indicator area, said reference color chart comprising at least one reference color corresponding to time exposure to ultraviolet radiation, such that comparison of the color developed by said chromogenic composition upon exposure to ultraviolet light with a reference color provides an indication of the time and degree of exposure to ultraviolet radiation.

29. A method of determining the time and degree of exposure to ultraviolet radiation which comprises:

placing an ultraviolet radiation monitoring device in the vicinity of area to be monitored,

said ultraviolet radiation monitoring device comprising at least one first substrate and at least one second substrate, said at least one second substrate being capable of being closely associated with at least one first substrate,

said at least one first substrate having a first surface bearing an indicator area comprising a chromogenic composition, said chromogenic composition comprising the colored reaction product of a chromogen and a color developer, said colored reaction product being capable of changing color when exposed to ultraviolet radiation,

said at least one second substrate having a first surface bearing a reference color chart, said reference color chart comprising at least one reference color corresponding to time exposure to ultraviolet radiation, such that comparison of the color developed by said chromogenic composition upon exposure to ultraviolet light with a reference color provides an indication of the time and degree of exposure to ultraviolet radiation,

exposing said ultraviolet radiation monitoring device to ultraviolet radiation,

periodically comparing the color of said chromogenic composition with a color on the reference color chart to determine the degree of exposure to ultraviolet radiation.

30. An ultraviolet radiation monitoring device comprising:

a first substrate having a first surface bearing an indicator area comprising a chromogenic composition, said chromogenic composition comprising (a) a substantially colorless mixture of a chromogen and a color developer capable of reacting to form color when exposed to ultraviolet radiation, or (b) the colored reaction product of a chromogen and a color developer,

said color developer being attapulgite clay, silica, zinc oxide, a non-metal chelated phenol, a non-metal chelated phenolic novolac alkyl salicylic acid, or a salicylic acid resin,

said first substrate bearing a reference color chart adjacent said indicator area, said reference color chart comprising at least one reference color corresponding to time exposure to ultraviolet radiation, such that comparison of the color developed by said chromogenic composition upon exposure to ultraviolet light with a reference color provides an indication of the time and degree of exposure to ultraviolet radiation.

31. The ultraviolet radiation monitoring device of claim 30, wherein said color developing agent is silica.

32. The ultraviolet radiation monitoring device of claim 31, wherein said chromogen is 2-anilino-3-methyl-6-(ethylisopentylamino)fluoran.