Claims
- 1. A process for forming a polythioether comprising: wherein R1 is a C1-10 alkyl, —(R3Q)pR3— or C6-C20 aryl where Q is O or S, each R3 is independently C1-6 alkyl, and p is an integer between 0 and 6; R2 is C1-6 alkyloxy or C5-12 cycloalkyloxy, R4 is H, C1-6 alkyl, C1-6 alkyl alcohol and C0-6 alkyl substituted with where X is a halogen, m is an integer between 1 and 4, and n is an integer selected to yield a molecular weight for said polythioether of between 1000 and 10,000 Daltons comprising the step of: reacting a polythiol and a polyhalide in the presence of an aqueous base.
- 2. The process of claim 1 wherein said polythiol is a dithiol.
- 3. The process of claim 2 wherein the dithiol is selected from the group consisting of: ethanedithiol, vinylcyclohexyldithiol, dicyclopentadienedithiol, dipentene dimercaptan, hexanedithiol, dimercaptodiethyl sulfide, dimercaptodiethyl ether, and dimercaptodioxaoctane.
- 4. The process of claim 1 wherein said polyhalide is a dihalide.
- 5. The process of claim 4 wherein said dihalide is selected from the group consisting of: dichloroalkane and a polyglycol dihalide.
- 6. The process of claim 1 wherein said polyhalide is a polychloride.
- 7. The process of claim 1 wherein said polyhalide is a trihalide.
- 8. The process of claim 1 wherein n+1 equivalents of thiol of said polythiol are reacted with n equivalents of halide of said polyhalide.
- 9. 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.
- 10. The curable composition of claim 9 further comprising one or more additives selected from the group consisting of: pigments, cure accelerators, surfactants, adhesion promoters, thixotropic agents and solvents.
- 11. The curable composition of claim 10 wherein said lightweight filler comprises microspheres.
- 12. The curable composition of claim 10 wherein said lightweight filler comprises an amorphous material.
RELATED APPLICATIONS
This application is a divisional of U.S. patent application Ser. No. 09/802,427 filed Mar. 9, 2001, now U.S. Pat. No. 6,525,168 which claims priority of U.S. Provisional Patent Application Ser. No. 60/188,106 filed Mar. 9, 2000.
US Referenced Citations (16)
Non-Patent Literature Citations (3)
Entry |
Japanese Patent Abstract: JP 363273646 A, Nov. 10, 1988. |
Japanese Patent Abstract: JP 02000128857 A, May 9, 2000. |
Tarasiuk et al.; “Products of polycondensation of 4, 4′ -biphenyldithiol with some hydrocarbon dihalides”; 1997, Chem Abstract 128:61872. |
Provisional Applications (1)
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Number |
Date |
Country |
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60/188106 |
Mar 2000 |
US |