Claims
- 1. A polythioether comprising:
- 2. The polythioether of claim 1 wherein R1 is C2-C8 alkyl.
- 3. The polythioether of claim 1 where R1 is —(R3Q)pR3— where R3 in each occurrence is C1-2 and p being 1 or 2.
- 4. The polythioether of claim 1 wherein R2 is C1-C2 alkyloxy.
- 5. The polythio ether of claim 1 wherein the molecular weight of said polythioether is between 2000 and 6000 Daltons.
- 6. The polythioether of claim 1 wherein R4 is hydrogen.
- 7. The polythioether of claim 1 wherein R4 is &Brketopenst;CH2CH2(R2)m&Brketclosest;X
- 8. The polythioether of claim 1 having an atomic percentage ratio C:S:O of 35-49:20-60:0-20.
- 9. The polythioether of claim 1 wherein R4 is capped with an additional terminal functionality selected from the group consisting of: hydroxyl, olefin, epoxy, cyano, isocyano, silyl, siloxy, secondary amine and alkyl groups.
- 10. A mixture of polythioether polymers comprising: a polythioether polymer having the formula
- 11. The polythioether mixture of claim 10 wherein z is 3.
- 12. The polythioether mixture of claim 10 wherein the mixture has an average functionality between 2 and 4.
- 13. The polythioether mixture of claim 12 wherein the average functionality is between 2.05 and 3.00.
- 14. A process for forming a polythioether according to claim 1 comprising the step of: reacting a polythiol and a polyhalide in the presence of an aqueous base.
- 15. The process of claim 14 wherein said polythiol is a dithiol.
- 16. The process of claim 15 wherein the dithiol is selected from the group consisting of: ethanedithiol, vinylcyclohexyldithiol, dicyclopentadienedithiol, dipentene dimercaptan, hexanedithiol, dimercaptodiethyl sulfide, dimercaptodiethyl ether, and dimercaptodioxaoctane.
- 17. The process of claim 14 wherein said polyhalide is a dihalide.
- 18. The process of claim 17 wherein said dihalide is selected from the group consisting of: dichloroalkane and a polyglycol dihalide.
- 19. The process of claim 14 wherein said polyhalide is a polychloride.
- 20. The process of claim 14 wherein said polyhalide is a trihalide.
- 21. The process of claim 14 wherein n+1 equivalents of thiol of said polythiol are reacted with n equivalents of halide of said polyhalide.
- 22. A curable composition comprising:
42 to 80 weight percent of a polythioether polymer according to claim 1, 0.3 to 15 weight percent of a lightweight filler and 0.1 to 20 weight percent of a curing agent.
- 23. The curable composition of claim 22 further comprising one or more additives selected from the group consisting of: pigments, cure accelerators, surfactants, adhesion promoters, thixotropic agents and solvents.
- 24. The curable composition of claim 23 wherein said lightweight filler comprises microspheres.
- 25. The curable composition of claim 23 wherein said lightweight filler comprises an amorphous material.
- 26. The use of a polythioether according to claim 1 upon cure as an aerospace sealant.
- 27. A polythioether according to claim 1 substantially as described herein in any of the examples.
RELATED APPLICATION
[0001] This application claims priority of U.S. Provisional Patent Application 60/188,106 filed Mar. 9, 2000, and is incorporated herein by reference.
Provisional Applications (1)
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Number |
Date |
Country |
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60188106 |
Mar 2000 |
US |