Moisture curable hot melt sealant composition
A moisture curable hot melt sealant composition that includes a silane-modified polyurethane polymer that is free of isocyanate groups, a first rosin-based tackifying agent, a second tackifying agent different from the first rosin-based tackifying agent, a first ethylene vinyl acetate copolymer, a butene component having a weight average molecular weight from 30,000 g/mole to 700,000 g/mole and being selected from the group consisting of polyisobutylene, polyisobutene, polybutene, and combinations thereof; and filler.
1. A moisture curable hot melt sealant composition comprising:
a silane polyurethane polymer that is free of isocyanate groups and derived from polyether;
a first rosin-based tackifying agent;
a second tackifying agent different from the first rosin-based tackifying agent;
a first ethylene vinyl acetate copolymer;
a butene component having a weight average molecular weight from 30,000 g/mole to 700,000 g/mole, the butene component being selected from the group consisting of polyisobutylene, polyisobutene, polybutene, and combinations thereof; and
filler.
2. The sealant composition of claim 1 , wherein the second tackifying agent is selected from the group consisting of aliphatic tackifying agent, aromatic tackifying agent, aromatic-modified aliphatic tackifying agent, cycloaliphatic tackifying agent, aromatic-modified cycloaliphatic tackifying agent, and combinations thereof.
3. The sealant composition of claim 2 , wherein the second tackifying agent comprises from 0% by weight to no greater than 15% by weight aromaticity based on the weight of the second tackifying agent.
4. The sealant composition of claim 3 , wherein the second tackifying agent exhibits a softening point of at least 100° C.
5. The sealant composition of claim 1 comprising from 10% by weight to 40% by weight of the first rosin-based tackifying agent.
6. The sealant composition of claim 1 , wherein the butene component has a weight average molecular weight from 30,000 g/mol to less than 400,000 g/mol.
7. The sealant composition of claim 1 , wherein the first rosin-based tackifying agent is a rosin-ester tackifying agent.
8. The sealant composition of claim 1 comprising
no greater than 20% by weight of the silane polyurethane polymer,
from 5% by weight to 30% by weight ethylene vinyl acetate, and
from 10% by weight to 40% by weight of the first rosin-based tackifying agent.
9. The sealant composition of claim 8 comprising no greater than 10% by weight of the butene component.
10. The sealant composition of claim 1 comprising
no greater than 20% by weight of the silane polyurethane polymer,
from 5% by weight to 30% by weight ethylene vinyl acetate,
from 5% by weight to 30% by weight of the first rosin-based tackifying agent, and
from 5% by weight to 20% by weight of the second tackifying agent.
11. The sealant composition of claim 10 comprising no greater than 10% by weight of the butene component.
12. The sealant composition of claim 1 , comprising from 5% by weight to 20% by weight of the second tackifying agent.
13. The sealant composition of claim 1 , wherein the silane polyurethane polymer has a viscosity of from 10,000 cP to 60,000 cP at 25° C.
14. The sealant composition of claim 1 comprising from 1% by weight to no greater than 7% by weight of the butene component.
15. The sealant composition of claim 1 , wherein the sealant composition exhibits an elongation at break of at least 500% at 30 days.
16. The sealant composition of claim 1 , wherein the sealant composition exhibits a shear adhesion failure temperature of at least 60° C.
17. The sealant composition of claim 1 , wherein the sealant composition exhibits a lap shear of at least 150 psi at 30 days.
18. The sealant composition of claim 1 , wherein the sealant composition exhibits a moisture vapor transmission rate of no greater than 25 grams per square meter per day (g/m 2 /day).
19. The sealant composition of claim 1 , wherein the sealant composition exhibits a tensile strength at break of at least 200 psi at 24 hours.
20. The sealant composition of claim 1 , wherein the sealant composition exhibits a 60° C. heated dead load of at least 90 minutes when tested at 44 days.
21. The sealant composition of claim 10 , wherein the silane polyurethane polymer has a viscosity of from 10,000 cP to 60,000 cP at 25° C.
22. The sealant composition of claim 1 , wherein the filler comprises talc.
23. An insulating glass unit comprising:
a first pane of glass;
a second pane of glass;
a spacer disposed between the first pane of glass and the second pane of glass; and
the sealant composition of claim 1 in contact with the first pane of glass, the second pane of glass, and the spacer.