Controlled cure rate using polyether-coated synergists

Patent metadata

Field	Value
Publication number	US-11505702-B2
Application number	US-201916376034-A
Country	US
Kind code	B2
Filing date	Apr 5, 2019
Priority date	Apr 5, 2019
Publication date	Nov 22, 2022
Grant date	Nov 22, 2022

Abstract

Polysulfide compositions having a polyether synergist are disclosed. Polysulfide compositions that contain polyether synergists exhibit a rapid onset of cure and have acceptable final properties. The polysulfide compositions can be used as sealants.

First claim

What is claimed is:

1. A composition, comprising:
a thiol-terminated polysulfide prepolymer;
a polysulfide cure activator;
a polysulfide cure accelerator;
a porous material; and
a synergist, wherein the synergist comprises a polyether having a number average molecular weight less than 5,000 Da, wherein molecular weight is determined by gel permeation chromatography, and
wherein the composition comprises from 0.1 wt. % to 10 wt % of the synergist, wherein wt % is based on the total weight of the composition.

2. The composition of claim 1 , wherein,
the polysulfide cure activator comprises a metal oxide; and
the polysulfide cure accelerator comprises an amine-based sulfur donor.

3. The composition of claim 1 , wherein the porous material is characterized by:
a BET from 5 m 2 /g to 700 m 2 /g;
a total pore volume from 0.01 mL/g to 10 mL/g;
an average pore diameter from 10 nm to 30 nm; or
a combination of any of the foregoing.

4. The composition of claim 1 , wherein the porous material comprises silica, alumina, zinc oxide, titanium dioxide, zirconia, hafnia, yttria, rare earth oxides, boehmite, alkaline earth fluorides, calcium phosphates, and hydroxyapatite, or a combination of any of the foregoing.

5. The composition of claim 1 , wherein the porous material comprises silica.

6. The composition of claim 1 , wherein the composition comprises from 0.1 wt % to 10 wt % of the porous material, wherein wt % is based on the total weight of the composition.

7. The composition of claim 1 , wherein the composition further comprises a filler.

8. The composition of claim 7 , wherein the composition comprises from 5 wt % to 70 wt % of the filler, where wt % is based on the total weight of the composition.

9. The composition of claim 1 , wherein the polyether comprises polyethylene glycol, polypropylene glycol, poly(tetramethylene ether) glycol, blocked copolymers of any of the foregoing, crown ethers, or a combination of any of the foregoing.

10. The composition of claim 1 , wherein the polyether comprises terminal hydroxyl groups, terminal alkyl groups, terminal substituted phenyl groups, terminal (meth)acryloyl groups, or a combination of any of the foregoing.

11. The composition of claim 1 , wherein the polyether comprises a polyether having the structure of Formula (7), the structure of Formula (8), or a combination thereof:

wherein,
n is an integer from 1 to 6;
p is an integer from 2 to 50;
z is an integer from 3 to 6;
each R 1 is independently selected from hydrogen, C 1-10 alkyl, (meth)acryloyl, and substituted aryl;
each R 2 is independently selected from hydrogen and C 1-3 alkyl; and
B is a polyfunctional moiety.

12. The composition of claim 1 , wherein the composition comprises:
from 20 wt % to 70 wt % of the thiol-terminated polysulfide prepolymer;
less than 10 wt % of the polysulfide cure activator;
less than 2 wt % of the polysulfide cure accelerator; and
from 1 wt % to 6 wt % of the synergist,
wherein wt % is based on the total weight of the composition.

13. A cured composition prepared from the composition of claim 1 .

14. A part comprising the cured composition of claim 13 .

15. A method of sealing a part, comprising:
applying the composition of claim 1 to a surface of a part; and
curing the applied composition to seal the part.

16. A part sealed using the method of claim 15 .

Assignees

• Prc Desoto Int Inc

Inventors

• Toolis Amy Liane
• Hsu Lorraine
• Martin Justin

Classifications

• C09J181/04

  Polysulfides · CPC title

• C08G75/14 Primary

  Polysulfides · CPC title

• C08K3/22

  of metals · CPC title

• C08K5/3725

  containing nitrogen · CPC title

• C08L71/02

  Polyalkylene oxides · CPC title