Glass laminate containing ionomer
A non-autoclave process for producing a glass laminate comprises applying a sub-assembly including a rigid layer and an ionomer interlayer in a vacuum bag or vacuum press under vacuum followed by heating, cooling, and releasing vacuum.
1. A process comprising sequentially:
(a) providing two rigid layers and an ionomeric interlayer,
(b) constructing a sub-assembly comprising the ionomeric interlayer between the rigid layers;
(c) placing the sub-assembly in a vacuum bag or vacuum press;
(d) applying a vacuum to the vacuum bag or vacuum press for a maximum of 30 minutes while maintaining the sub-assembly at a temperature between 10° C. and 22° C.;
(e) increasing the temperature of the sub-assembly to at least 125° C. over a minimum of 20 minutes while maintaining vacuum on the vacuum bag or vacuum press;
(f) processing the sub-assembly between 125° C. and 135° C. for a minimum of 20 minutes to form a laminate having mature edge seal and to effect sufficient adhesion of all layers of the sub-assembly;
(g) cooling the laminate at a rate of at least 0.5° C./minute until the laminate reaches a temperature below 40° C. to prevent the formation of edge bubbles of the laminate; and
(h) removing the vacuum from the vacuum bag, containing the laminate, and allowing the laminate to reach atmospheric pressure as the laminate continues to cool to ambient temperature; wherein step (a) through step (d) are carried out at 10° C. to 22° C. and a relative humidity of greater than 0 percent but less than 40 percent; and step (d) through step (g) are carried out under a vacuum pressure of 40 kPa or less.
2. The process of claim 1 wherein the rigid layer is a glass sheet.
3. The process of claim 1 wherein step (a) to step (d) are carried out at 10° C. to 18° C.
4. The process of claim 1 wherein step (d) is carried out for 10 minutes.
5. The process of claim 1 wherein the temperature in step (e) is increased to at least at 130° C. and step (f) is carried out at least at 130° C.
6. The process of claim 1 wherein the temperature in step (e) is increased to at least at 130° C. and step (f) is carried out at least at 135° C.
7. The process of claim 1 wherein the rate in step (g) is at least 3° C./minute.
8. The process of claim 1 wherein the rate in step (g) is at least 5° C./minute.
9. A process comprising sequentially:
(a) providing two rigid layers and an ionomeric interlayer,
(b) constructing a sub-assembly comprising the ionomeric interlayer between the rigid layers:
(c) placing the sub-assembly in a vacuum bag or vacuum press;
(d) applying a vacuum to the vacuum bag or vacuum press for a maximum of 30 minutes while maintaining the sub-assembly at a temperature between 10° C. and 22° C.;
(e) increasing the temperature of the sub-assembly to at least 125° C. over a minimum of 20 minutes while maintaining vacuum on the vacuum bag or vacuum press;
(f) processing the sub-assembly at a minimum of 125° C. for a minimum of 20 minutes to form a laminate;
(g) cooling the laminate at a rate of at least 10° C./minute until the laminate reaches a temperature below 40° C.; and
(h) removing the vacuum from the vacuum bag, containing the laminate, and allowing the laminate to reach atmospheric pressure as the laminate continues to cool to ambient temperature;
wherein step (a) through step (d) are carried out at 10° C. to 22° C. and a relative humidity of greater than 0 percent but less than 40 percent; and step (d) through step (g) are carried out under a vacuum pressure of 40 kPa or less.
10. The process of claim 9 wherein, the interlayer is stored at between about 6° C. and 20° C. and 20 to 40 percent relative humidity for at least 24 hours.