Low-temperature press process for making insulating glass assemblies
View Patent ↗A process for making an insulating glass assembly is disclosed, the process including applying a sealant composition to a surface of a spacer; contacting the sealant composition with a glass pane, and applying pressure on the glass pane to bond the glass pane to the spacer through the sealant composition, the pressure being applied at an ambient temperature of from about 15° C. to about 60° C.
1. A process for making an insulating glass assembly, the process comprising:
applying a moisture curable sealant composition to a surface of a spacer, the sealant composition comprising
silane-functional amorphous poly-α-olefin,
butyl rubber,
polyisobutylene, and
tackifying agent;
contacting the sealant composition with a first glass pane; and
applying pressure on the assembly at an ambient temperature of from about 15° C. to about 60° C. to bond the first glass pane to the spacer through the sealant composition.
2. The process of claim 1 , wherein the pressure applied is from about 2 psi to about 50 psi.
3. The process of claim 1 , further comprising applying the sealant composition to at least two opposite surfaces of the spacer simultaneously.
4. The process of claim 1 , wherein applying the sealant composition comprises dispensing the sealant composition at a temperature greater than 90° C.
5. The process of claim 1 , wherein applying the sealant composition comprises dispensing the sealant composition at a temperature from about 50° C. to about 150° C.
6. The process of claim 1 , wherein the sealant exhibits a needle penetration of from about 3.5 mm to less than 8.0 mm prior to cure.
7. The process of claim 1 , wherein the pressure is applied by a press selected from the group consisting of a platen press, a roller press or a combination thereof.
8. The process of claim 1 , wherein the pressure is applied while the assembly is in a vertical position.
9. The process of claim 1 , wherein the sealant further comprises amorphous poly-α-olefin different from said silane-functional amorphous poly-α-olefin.
10. The process of claim 1 , wherein the spacer is metallic.
11. The process of claim 1 , wherein the spacer comprises polymer.
12. The process of claim 1 , wherein the spacer extends from a sash frame and is integral with the sash frame.
13. The process of claim 1 , wherein the insulating glass assembly passes the ASTM E774/773 Class C performance requirement.
14. The process of claim 1 , wherein the insulating glass assembly passes the ASTM E774/773 Class CB performance requirement.
15. The process of claim 1 , wherein the insulating glass assembly passes the ASTM E774/773 Class CBA performance requirement.
16. The process of claim 1 , further comprising
applying a second sealant composition to a frame;
contacting the second sealant composition with the insulating glass assembly prepared in claim 12 , and
applying pressure to the frame and assembly to bond the frame to the assembly through the second sealant composition.
17. The process of claim 16 , wherein the second sealant composition comprises
silane-functional amorphous poly-α-olefin;
butyl rubber;
polyisobutylene; and
tackifying agent,
the composition exhibiting a needle penetration from about 3.5 mm to less than 8.0 mm.
18. The process of claim 1 , further comprising
applying a sealant composition to a second surface of the spacer, contacting the sealant composition on the second surface of the spacer with a second pane of glass, and
applying pressure on the assembly at an ambient temperature of from about 15° C. to about 60° C. to bond the second glass pane to the spacer through the sealant composition.
19. The process of claim 18 , wherein the pressure applied is from about 2 psi to about 50 psi.
20. The process of claim 18 , further comprising applying the pressure to the first pane of glass and the second pane of glass simultaneously.