Controlling cure rate with wetted filler

Patent metadata

Field	Value
Publication number	US-11214666-B2
Application number	US-202016848909-A
Country	US
Kind code	B2
Filing date	Apr 15, 2020
Priority date	Apr 15, 2020
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

Compositions include a polythiol and a wetted filler. The composition comprises from 0.1 wt % to 10 wt % water based on the total weight of the composition. The compositions exhibit an extended working time and a rapid onset of cure. The compositions can be used as sealants.

First claim

What is claimed is:

1. A composition, comprising:
a polythiol; and
a wetted filler, wherein the wetted filler comprises greater than 0.1 wt % water, wherein wt % is based on the total weight of the wetted filler, and
wherein the composition comprises from 0.1 wt % to 10 wt % water, wherein the water is derived from the wetted filler, and wt % is based on the total weight of the composition.

2. The composition of claim 1 , wherein the wetted filler comprises from greater than 0.1 wt % to 70 wt % water, wherein wt % is based on the total weight of the wetted filler.

3. The composition of claim 1 , wherein the composition comprises from 0.5 wt % to 55 wt % of the wetted filler, wherein wt % is based on the total weight of the composition.

4. The composition of claim 1 , wherein,
the composition comprises from 0.1 wt % to 3 wt % water;
the water is derived from the wetted filler; and
wt % is based on the total weight of the composition.

5. The composition of claim 1 , wherein the composition comprises:
from 1 wt % to 5 wt % of the wetted filler; and
from 0.5 wt % to 3 wt % water,
wherein wt % is based on the total weight of the composition.

6. The composition of claim 1 , wherein the wetted filler comprises water and an inorganic filler.

7. The composition of claim 6 , wherein the inorganic filler is characterized by:
a BET surface area greater than 1 m 2 /g;
a total pore volume from 0.01 mL/g to 2 mL/g;
an average pore diameter from 10 nm to 30 nm; or
a combination of any of the foregoing.

8. The composition of claim 6 , wherein the inorganic filler is characterized by a BET surface area greater than 20 m 2 /g.

9. The composition of claim 1 , wherein the wetted filler comprises wetted silica, wetted calcium carbonate, wetted carbon black, wetted magnesium silicate, wetted aluminum silicate, wetted magnesium hydroxide, or a combination of any of the foregoing.

10. The composition of claim 1 , wherein the wetted filler comprises wetted silica, wetted calcium carbonate, wetted carbon black, or a combination of any of the foregoing.

11. The composition of claim 1 , wherein the polythiol comprises a polythiol monomer, a thiol-functional prepolymer, or a combination thereof.

12. The composition of claim 1 , wherein the polythiol comprises a thiol-functional sulfur-containing prepolymer.

13. The composition of claim 12 , wherein the thiol-functional sulfur-containing prepolymer comprises a thiol-functional polysulfide prepolymer.

14. The composition of claim 12 , wherein the composition comprises from 35 wt % to 55 wt % of the thiol-functional sulfur-containing prepolymer, where wt % is based on the total weight of the composition.

15. The composition of claim 12 , wherein,
the thiol-functional sulfur-containing prepolymer comprises a thiol-functional polysulfide prepolymer; and
the composition further comprises a thiol/thiol cure activator.

16. The composition of claim 15 , wherein the thiol/thiol cure activator comprises a metal oxide.

17. The composition of claim 1 , wherein the composition further comprises a dry filler, wherein the dry filler comprises less than 0.05 wt % water, wherein wt % is based on the total weight of the dry filler.

18. The composition of claim 17 , wherein the composition comprises 5 wt % to 55 wt % of the dry filler, where wt % is based on the total weight of the composition.

19. The composition of claim 18 , wherein the dry filler comprises a dry inorganic filler.

20. A sealant system comprising:
(a) a first part, wherein the first part comprises the composition of claim 1 ; and
(b) a second part, wherein the second part comprises a thiol/thiol cure activator.

21. A cured sealant prepared from the sealant system of claim 20 .

22. A part comprising the cured sealant of claim 21 .

23. A method of sealing a part, comprising:
combining the first part and the second part of the sealant system of claim 20 , to provide a curable composition;
applying the curable composition to a surface of a part; and
curing the applied composition to seal the part.

24. A part sealed using the method of claim 23 .

25. A vehicle comprising the part of claim 23 .

26. A vehicle of claim 25 , wherein the vehicle is an aerospace vehicle.

Assignees

• Prc Desoto Int Inc

Inventors

• Toolis Amy Liane
• Hsu Lorraine
• Clingerman Daniel
• Martin Justin

Classifications

• C08K2201/006

  Additives being defined by their surface area · CPC title

• C08K2201/002

  Physical properties · CPC title

• C08K3/26

  Carbonates; Bicarbonates · CPC title

• C08K2003/265

  Calcium, strontium or barium carbonate · CPC title

• C08L81/02 Primary

  Polythioethers; Polythioether-ethers · CPC title