Thermoplastic sheet for a heads-up display system

Patent metadata

Field	Value
Publication number	US-9857571-B2
Application number	US-201314378280-A
Country	US
Kind code	B2
Filing date	Feb 22, 2013
Priority date	Feb 24, 2012
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A thermoplastic sheet for the manufacture of a transparent motor vehicle or building glazing intended for the display of information, in particular of a laminated glazing, the sheet including a compound exhibiting an absorption band in the ultraviolet region and of which the diffuse reflection spectrum as a function of the energy of the incident radiation is characterized by a V value on the reflection curve, determined by the point of intersection between the tangent (1) at the inflection point of said curve and its asymptote (2) at the higher energies, of between 3.06 and 3.65 eV.

First claim

The invention claimed is:

1. A thermoplastic sheet for the manufacture of a transparent motor vehicle or building glazing intended for the display of information, said sheet comprising:
a compound exhibiting an absorption band in the ultraviolet region, wherein a diffuse reflection spectrum as a function of the energy of the incident radiation of said compound is characterized by a V value on the reflection curve, determined by the point of intersection between the tangent (1) at the inflection point of said curve and its asymptote (2) at the higher energies, of between 3.06 and 3.65 eV, and
a luminophore material incorporated in said sheet, said luminophore absorbing incident excitation radiation emitted between 300 and 420 nm and releasing, after said excitation, radiation in the visible region.

2. The thermoplastic sheet as claimed in claim 1 , wherein the V value is between 3.14 and 3.50 eV.

3. The thermoplastic sheet as claimed in claim 1 , exhibiting an integrated absorbance between 310 and 340 nm of greater than 98%.

4. The thermoplastic sheet as claimed in claim 1 , wherein the thermoplastic material is selected from the group consisting of PVBs, plasticized PVCs, polyurethane PU and ethylene/vinyl acetates EVAs.

5. The thermoplastic sheet as claimed in claim 1 , wherein the plastic is a PolyVinyl Butyral (PVB).

6. The thermoplastic sheet as claimed in claim 1 , wherein said compound is selected from the group consisting of: 2-hydroxy-4-octyloxybenzophenone, N-(2-ethoxyphenyl)-N′-(2-ethylphenyl)ethanediamide and 2-(2H-benzotriazol-2-yl)-p-cresol.

7. The thermoplastic sheet as claimed in claim 1 , with a thickness of between 300 and 1600 micrometers.

8. A thermoplastic sheet for a transparent laminated glazing, said sheet comprising:
a compound exhibiting an absorption band in the ultraviolet region, and having a diffuse reflection spectrum as a function of the energy of the incident radiation that is characterized by a V value on a reflection curve, determined by a point of intersection between a tangent at the inflection point of said reflection curve and an asymptote of said reflection curve at higher energies, of between 3.06 and 3.65 eV, and
a luminophore material incorporated in said sheet, said luminophore absorbing incident excitation radiation emitted between 300 and 420 nm and releasing, after said excitation, radiation in the visible region.

9. The thermoplastic sheet as claimed in claim 1 , wherein said luminophore is a hydroxyterephthalate.

10. The thermoplastic sheet as claimed in claim 9 , wherein said luminophore is an alkyl hydroxyterephthalate ROOC-Φ(OH) x —COOR of expanded formula:

in which Φ denotes a benzene ring substituted by at least one hydroxyl (OH) group, R is a hydrocarbon chain comprising from 1 to 10 carbon atoms and x is equal to 1 or 2.

11. The thermoplastic sheet as claimed in claim 10 , wherein said luminophore is a dialkyl 2,5-dihydroxyterephthalate corresponding to the expanded formula:

12. The thermoplastic sheet as claimed in claim 1 , additionally comprising an H°-donating additive.

13. The thermoplastic sheet as claimed in claim 12 , wherein the H°-donating additive is selected from the group consisting of phenylamines, diphenylamines and diamines.

14. A laminated glazing for the display of information, the laminated glazing to be used in a motor vehicle windshield or a building glazing, comprising an assemblage of at least two transparent sheets of inorganic glass or of a resistant organic material which are connected to one another by an insert comprising at least one thermoplastic sheet as claimed in claim 1 .

15. A device for displaying an image on a transparent glazing, comprising a laminated glazing as claimed in claim 14 and a generating source of concentrated electromagnetic radiation of the laser type, the radiation of which is between 350 and 410 nm, the radiation being directed toward the region or regions of the glazing comprising the luminophore layer.

16. The thermoplastic sheet as claimed in claim 3 , wherein the integrated absorbance is greater than 99%.

17. The thermoplastic sheet as claimed in claim 7 , wherein the thickness is between 300 and 800 micrometers.

Assignees

• Sekisui Chemical Co Ltd

Inventors

• Sablayrolles Jean
• Clabau Frederic
• Labrot Michael

Classifications

• B32B17/10761

  containing vinyl acetal · CPC title

• G02B2027/0118

  comprising devices for improving the contrast of the display / brillance control visibility · CPC title

• B32B17/10678

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

• C08K5/005

  Stabilisers against oxidation, heat, light, ozone · CPC title

• G02B13/143 Primary

  for use with ultraviolet radiation · CPC title