METHOD FOR PRODUCING A SAFETY TEMPERED VEHICLE GLAZING UNIT AND SAFETY TEMPERED VEHICLE GLAZING UNIT

Abstract

A method for producing a safety tempered vehicle glazing unit, includes a. tempering a glass pane at a tempering temperature; b. cooling the tempered glass pane to a first temperature T1 above room temperature; c. coating the tempered glass pane with a dispersion of an organic resin at the first temperature T1, and d. drying and cooling to room temperature Tr.

Claims

1. A method for producing a safety tempered vehicle glazing unit, comprising: a. tempering a glass pane at a tempering temperature; b. cooling the tempered glass pane to a first temperature T1 above room temperature Tr; c. coating the tempered glass pane with a dispersion of an organic resin at the first temperature T1, and d. drying and cooling to room temperature Tr.

2. The method according to claim 1, comprising a step a1 before step b: a1. applying a further coating on the glass pane or tempered glass pane.

3. The method according to claim 1, wherein the first temperature T1 is between 40° C. and 220° C.

4. The method according to claim 1, wherein the dispersion is a polyurethane dispersion.

5. The method according to claim 1, wherein dispersion consists of an anionic aqueous solution of a polyurethanic compound including at least one aliphatic or aromatic polyurethanic compound.

6. The method according to claim 1, wherein the further coating comprises one or more of a IR-light reflective coating or enamel coating.

7. The method according to claim 1, wherein the coating of step c is a curtain coating step or spray coating step.

8. The method according to claim 1, wherein the drying of step d comprises a heating to a temperature T2, the temperature T2 being higher than the first temperature T1, before the cooling to room temperature Tr.

9. A safety tempered vehicle glazing unit, comprising a tempered glass pane and an anti-shutter coating with an organic resin.

10. A vehicle glazing unit according to claim 8, wherein the coating is applied on an inner side of the tempered glass pane.

11. The vehicle glazing unit according to claim 9, wherein the coating applied on the inner side is UV stable.

12. The vehicle glazing unit according to claim 8, wherein the coating comprises polyurethane or consists of polyurethane.

13. The vehicle glazing unit according to claim 8, wherein the coating has a thickness from 15 μm to 200 μm.

14. The vehicle glazing unit according to claim 8, having the same transmission as a tempered glass pane without the coating with the organic resin.

15. The vehicle glazing unit according to claim 8, wherein the vehicle glazing unit is one of a glass roof, a side window or back window.

16. The method according to claim 3, wherein the first temperature T1 is between 40° C. and 100° C.

17. The method according to claim 16, wherein the first temperature T1 is between 50° C. and 80° C.

18. The method according to claim 7, wherein the coating of step c is curtain coating step.

19. The vehicle glazing unit according to claim 13, wherein the coating has a thickness from 90 μm to 150 μm.

Description

[0040] Embodiments and aspects of the invention are illustrated in the drawing. In the drawing shows

[0041] FIG. 1 a first embodiment of the safety tempered vehicle glazing unit,

[0042] FIG. 2 a second embodiment of the safety tempered vehicle glazing unit and

[0043] FIG. 3 an embodiment of the method for producing a safety tempered vehicle glazing unit.

[0044] FIG. 1 shows a first embodiment of the safety tempered vehicle glazing unit 1. The glazing unit 1 comprises a tempered glass pane 2 which is a bent glass pane in this example. The glass pane 2 has a first outer surface I and a second inner surface II. On the inner surface a coating 4 is applied from an organic resin dispersion. The coating 4 provides anti-shattering properties to the safety tempered vehicle glazing unit. The coating is in particular a polyurethane coating.

[0045] FIG. 2 shows a second embodiment of the safety tempered vehicle glazing unit 1′. The glazing unit 1′ comprises a further coating 6 located in between the coating 4 having anti-shattering properties. The further coating 6 might be an IR-coating.

[0046] FIG. 3 shows a schema of the method for producing a safety tempered vehicle glazing unit.

[0047] In step PI a glass pane (2) is tempered and might be bent into the form of the vehicle glazing unit. Step P1 might further include the application of a further coating, for example an IR reflective coating.

[0048] In step PII the tempered glass pane (2) is cooled to a first temperature T1. This first temperature T1 is preferentially a temperature between 50° C. and 80° C.

[0049] In step PIII the tempered glass pane (2) is coated with a dispersion of an organic resin at the first temperature T1. At this first temperature T1, the dispersion forms a bubble free coating layer ensuring good anti-shattering properties.

[0050] In step PIV the tempered glass pane (2) with the coating is dried and cooled down to room temperature Tr. Optionally step PIV includes heating the tempered glass pane (2) for drying the coating at a temperature T2 and subsequently cooling to room temperature Tr. In this step PIV the dispersion of an organic resin dries and forms a layer with the anti-shattering properties.

REFERENCE NUMBERS

[0051] 1, 1′ glazing unit [0052] 2 tempered glass pane [0053] 4 coating [0054] 6 further coating [0055] I outer side of the glass pane [0056] II inner side of the glass pane