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 moisture curable sealant composition comprising:
silane-functional amorphous poly-α-olefin;
from 10% by weight to about 40% by weight butyl rubber;
polyisobutylene; and
tackifying agent,
the composition exhibiting a needle penetration from about 3.5 mm to less than 8.0 mm.
2. The sealant composition of claim 1 , wherein the composition exhibits a needle penetration from about 4.0 mm to about 6.0 mm.
3. The sealant composition of claim 1 , wherein the sealant composition, when in the form of a 60 mil film, exhibits a moisture vapor transmission rate no greater than 1 g/m 2 /day.
4. The sealant composition of claim 1 , wherein the sealant composition exhibits a final hardness of less than about 35 Shore A.
5. The sealant composition of claim 1 , further comprising amorphous poly-α-olefin.
6. The sealant composition of claim 5 comprising no greater than about 30% by weight of the amorphous poly-α-olefin.
7. The sealant composition of claim 1 comprising from about 5% by weight to about 80% by weight silane functional amorphous poly-α-olefin.
8. The sealant composition of claim 1 comprising from about 15% by weight to about 50% by weight silane functional amorphous poly-α-olefin.
9. The sealant composition of claim 1 comprising from 10% by weight to about 30% by weight butyl rubber.
10. The sealant composition of claim 1 comprising at least 10% by weight polyisobutylene.
11. The sealant composition of claim 1 comprising from about 5% by weight to about 60% by weight tackifying agent.
12. The sealant composition of claim 1 , wherein said sealant composition exhibits a final lap shear of at least 10 psi after twelve weeks.
13. The sealant composition of claim 1 , wherein said sealant composition exhibits less than 20% adhesion failure.
14. The sealant composition of claim 1 , wherein said sealant composition is free of adhesion failure.
15. The sealant composition of claim 1 , wherein said sealant composition comprises
from about 15% by weight to about 50% by weight silane-functional amorphous poly-α-olefin;
from about 10% by weight to about 50% by weight tackifying agent;
at least 10% by weight polyisobutylene; and
from 10% by weight to about 40% by weight butyl rubber.
16. The sealant composition of claim 1 further comprising no greater than about 30% by weight amorphous poly-α-olefin other than said silane-functional amorphous poly-α-olefin.
17. The sealant composition of claim 1 further comprising from about 0.2% by weight to about 2% by weight silane coupling agent.