Moisture curable hot melt sealant composition

Patent metadata

Field	Value
Publication number	US-11466186-B2
Application number	US-201916672072-A
Country	US
Kind code	B2
Filing date	Nov 1, 2019
Priority date	Nov 2, 2018
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

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.

First claim

What is claimed is:

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.

Assignees

• Fuller H B Co

Inventors

• Helmeke Marietta B
• Mosanu Claudia

Classifications

• C08K3/34

  Silicon-containing compounds · CPC title

• C08L23/0853

  Ethylene vinyl acetate copolymers · CPC title

• C08G18/837

  by silicon containing compounds · CPC title

• E06B3/67321

  Covering spacer elements, e.g. with sealants · CPC title

• E06B3/6733

  by applying, e.g. extruding, a ribbon of hardenable material on or between the panes · CPC title