Dual-curable sealant composition

Patent metadata

Field	Value
Publication number	US-10683395-B2
Application number	US-201716091410-A
Country	US
Kind code	B2
Filing date	Apr 7, 2017
Priority date	Apr 7, 2016
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

A dual-curable sealant composition includes a polysulfide having an —SH group, a metal oxide catalyst, and an alkylborane amine catalyst. A cured sealant is also formed from the dual-curable sealant composition. Moreover, a dual-cured sealant is formed that includes the polymerization product of the polysulfide reacted in the presence of the metal oxide catalyst and the alkylborane amine catalyst. Further, a dual-curable sealant system includes a first component including the polysulfide and the alkylborane amine catalyst and a second component including the metal oxide catalyst. An article is formed that includes a substrate and the cured sealant disposed on the substrate. Even further, a method of forming the dual-curable sealant composition includes the steps of providing the polysulfide, the alkylborane amine catalyst, and the metal oxide catalyst, and combining the polysulfide, the alkylborane amine catalyst, and the metal oxide catalyst to form the dual-curable composition.

First claim

What is claimed is:

1. A dual-curable sealant composition comprising:
A. a polysulfide having an —SH group from 30 to 80 parts by weight per 100 parts by weight of the composition;
B. a metal oxide catalyst from 1 to 10 parts by weight per 100 parts by weight of the composition;
C. an alkylborane amine catalyst from 0.5 to 4.5 parts by weight per 100 parts by weight of the composition; and
D. a thiuram curing accelerator from 0.1 to 10 parts by weight per 100 parts by weight of the composition.

2. The dual-curable sealant composition of claim 1 wherein said alkylborane amine catalyst has one or more alkyl groups bonded to a boron atom and each of said one of more alkyl groups is independently further defined as a C 1 -C 12 alkyl group.

3. The dual-curable sealant composition of claim 1 wherein said alkylborane amine catalyst has one more alkyl groups bonded to a nitrogen atom and each of said one of more alkyl groups is independently further defined as a C 1 -C 12 alkyl group.

4. The dual-curable sealant composition of claim 1 wherein said polysulfide has an —SH functionality of greater than or equal to 2.

5. The dual-curable sealant composition of claim 1 wherein said polysulfide has a weight average molecular weight of from 1,000 to 7,500 g/mol.

6. The dual-curable sealant composition of claim 1 wherein said metal oxide catalyst is manganese dioxide.

7. The dual-curable sealant composition of claim 1 that cures to have a viscosity of greater than 1,000 cps in 15 minutes.

8. The dual-curable sealant composition of claim 1 that cures to a tack-free of less than 120 minutes after the start of cure according to DIN 65262-1.

9. The dual-curable sealant composition of claim 1 that is free of an acid.

10. The dual-curable sealant composition of claim 1 that further comprises an acid.

11. A cured sealant formed from the dual-curable sealant composition claim 1 and comprising a weight percent of boron that is approximately equimolar to an amount of boron present in the dual-curable sealant composition within 10 mol %.

12. A dual-cured sealant that is the polymerization product of a polysulfide having an —SH group reacted in the presence of a metal oxide catalyst and an alkylborane amine catalyst.

13. The dual-cured sealant of claim 12 comprising a weight percent of boron that is approximately equimolar to an amount of boron present during polymerization ±10%.

14. The dual-cured sealant of claim 12 that has a Shore A hardness of at least 10 within 30 to 180 minutes of curing.

15. A method of forming a dual-curable sealant composition comprising a polysulfide having an —SH group, a metal oxide catalyst, and an alkylborane amine catalyst, said method comprising the steps of:
providing the polysulfide, the alkylborane amine catalyst, and the metal oxide catalyst; and
combining the polysulfide, the alkylborane amine catalyst, and the metal oxide catalyst to form the dual-curable composition.

16. An article comprising a substrate and dual-cured sealant disposed thereon, wherein said dual-cured sealant comprises the reaction product of a polysulfide having an —SH group reacted in the presence of a metal oxide catalyst and an alkylborane amine catalyst.

17. The article of claim 16 wherein said dual-cured sealant comprises a weight percent of boron that is approximately equimolar to an amount of boron present during reaction of the polysulfide within 10 mol %.

18. The article of claim 16 that is further defined as an aircraft fuel tank, a construction article, aircraft/aerospace article, motor or rail vehicle, ship, machine, glass insulation, and/or furniture.

19. A method of forming the dual-curable sealant composition according to claim 1 , said method comprising the steps of:
providing the polysulfide, the alkylborane amine catalyst, the metal oxide catalyst, and the thiuram curing accelerator; and
combining the polysulfide, the alkylborane amine catalyst, the metal oxide catalyst, and the thiuram curing accelerator to form the dual-curable composition.

20. An article comprising a substrate and a dual-cured sealant disposed thereon formed from the dual-curable sealant composition according to claim 1 .

Assignees

• Basf Se

Inventors

• Davis John Michael
• Maier Ralph Dieter
• Matos Karl
• Neigh Kevin M
• Schroeder Kristin

Classifications

• C09K3/1012 Primary

  Sulfur-containing polymers, e.g. polysulfides · CPC title

• C08L81/04

  Polysulfides · CPC title

• C08L81/02

  Polythioethers; Polythioether-ethers · CPC title

• C08G2190/00

  Compositions for sealing or packing joints · CPC title

• C08G2170/00

  Compositions for adhesives · CPC title