Fluorescent display

Patent metadata

Field	Value
Publication number	US-9989681-B2
Application number	US-201514688057-A
Country	US
Kind code	B2
Filing date	Apr 16, 2015
Priority date	May 7, 2014
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

Fluorescent displays are manufactured by lamination of at least one film A containing a polyvinyl acetal PA and, optionally, a plasticizer WA and at least one film B containing a polyvinyl acetal PB and at least one plasticizer WB between two glass panes, wherein prior to lamination, film A contains less than 22 wt. % plasticizer WA and contains 0.001 to 5 wt. % fluorophores, and film B contains at least 22 wt. % plasticizer WB and contains 0.005-5 wt. % UV absorber, each before lamination.

First claim

What is claimed is:

1. A transparent fluorescent display, comprising a laminate between two glass panes, at least one film A of the laminate containing a polyvinyl acetal PA and, optionally, at least one plasticizer WA, and at least one film B of the laminate containing a polyvinyl acetal PB and at least one plasticizer WB wherein prior to lamination, film A has less than 22 wt. % plasticizer WA and 0.001 to 5 wt. % fluorophores and film B has at least 22 wt. % plasticizer WB and 0.005 -5 wt. % UV absorber, and wherein in the display, film A and film B are in direct contact with each other.

2. The fluorescent display of claim 1 , wherein film A contains a fluorophore with a low diffusivity into film B.

3. The fluorescent display of claim 1 , wherein film B contains UV absorber with a low diffusivity into film A.

4. The fluorescent display of claim 2 , wherein film B contains UV absorber with a low diffusivity into film A.

5. The fluorescent display of claim 1 , wherein film A is arranged between a film B and a film C containing a polyvinyl acetal PC and at least 22 wt. % of at least one plasticizer WC.

6. The fluorescent display of claim 2 , wherein film A is arranged between a film B and a film C containing a polyvinyl acetal PC and at least 22 wt. % of at least one plasticizer WC.

7. The fluorescent display of claim 3 , wherein film A is arranged between a film B and a film C containing a polyvinyl acetal PC and at least 22 wt. % of at least one plasticizer WC.

8. The fluorescent display of claim 4 , wherein film A is arranged between a film B and a film C containing a polyvinyl acetal PC and at least 22 wt. % of at least one plasticizer WC.

9. The fluorescent display of claim 5 , wherein film C has no UV absorber or a UV absorber that does not absorb sufficiently at an excitation wavelength of the fluorophore which would prevent excitation of the fluorophore.

10. The fluorescent display of claim 1 , wherein at least one of films A or B contain a light stabilizer for the suppression of radical chain reactions.

11. The fluorescent display of claim 1 , wherein at least one of films A and/or B contain a phenolic antioxidant.

12. The fluorescent display of claim 1 , wherein film A comprises a polyvinyl acetal PA with a content of vinyl alcohol groups of from 6 to 26 wt. % and film B comprises a polyvinyl acetal PB with a content of vinyl alcohol groups of from 14 to 26 wt. %.

13. The fluorescent display of claim 1 , wherein film A is at least 1 mm smaller in an edge area than at least one glass pane, so that film B is in direct contact with at least one glass pane in this edge area.

14. The fluorescent display of claim 1 , wherein film A has at least one opening, so that film B is in direct contact with at least one glass pane through this opening.

15. The fluorescent display of claim 1 , wherein film B comprises at least two sub-films B′ and B″ having a different plasticizer content.

16. The fluorescent display of claim 1 , wherein at least one film B has a wedge-shaped thickness profile.

17. A display system for automobile windshields, automobile side glass, glass for aircraft, trains or ships, and display windows, elevators or facade glass, comprising a fluorescent display of claim 1 .

18. An automobile having a windshield containing a fluorescent display of claim 1 , and a side pane of UV-absorbing glass.

19. A method for the manufacture of a fluorescent display of claim 1 , comprising positioning film A on a glass pane, covering film A with at least one film B, and placing an assembly thus prepared on a second glass pane.

20. A transparent fluorescent display, comprising a laminate between two glass panes, at least one film A of the laminate containing a polyvinyl acetal PA and, optionally, at least one plasticizer WA, and at least one film B of the laminate containing a polyvinyl acetal PB and at least one plasticizer WB, wherein prior to lamination, film A has less than 22 wt. % plasticizer WA and 0.001 to 5 wt. % fluorophores, and film B has at least 22 wt. % plasticizer WB and 0.005-5 wt. % UV absorber, wherein in the display, film A and film B are in direct contact with each other, and wherein at least one UV absorber is a UV absorber which does not migrate or one having a low tendency to migrate into film A from film B, and is selected from the group consisting of polymeric UV absorbers, poorly soluble UV absorbers which have a solubility of less than 5 g/L in a combination of polyvinyl acetal PB and plasticizer WB, UV absorbers containing ionic groups, UV absorbers chemically bonded to polyvinylacetal, and nano-TiO 2 , and/or wherein the fluorophores of film B do not migrate, or are fluorophores having a low tendency to migrate selected from the group consisting of fluorescing inorganic particles, substituted perylenes, rylenes, quinacridone derivatives, fluorescent dyes with ionic groups, and polymeric fluorophores.

Assignees

• Kuraray Europe Gmbh

Inventors

• Greb Marco
• Lellig Philipp
• Keller Uwe

Classifications

• B60R1/001

  integrated in the windows, e.g. Fresnel lenses · CPC title

• B32B37/18

  involving the assembly of discrete sheets or panels only · CPC title

• B32B17/10678

  comprising UV absorbers or stabilizers, e.g. antioxidants · CPC title

• B32B2315/08

  Glass · CPC title

• B32B17/10568

  varying in thickness · CPC title