Claims
- 1. A mixture of 3,5-di(methylthio)-2,4-diaminotoluene and 3,5-di(methylthio)-2,6-diaminotoluene.
- 2. The mixture of claim 1 wherein the ratio of 3,5-di(methylthio)-2,4-diaminotoluene to 3,5-di(methylthio)-2,6-diaminotoluene is about 80/20.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of application Ser. No. 224,017, filed July 25, 1988, now abandoned; which in turn is a continuation of Ser. No. 917,168, filed Oct. 9, 1986, now U.S. Pat. No. 4,760,188; which is a continuation-in-part of Ser. No. 783,421, filed Oct. 3, 1985, now abandoned; which in turn is a division of Ser. No. 619,675, filed June 11, 1984, now U.S. Pat. No. 4,594,453.
As disclosed in U.S. Pat. No. 4,146,688 (Schwindt et al.), it is known that aromatic diamines can be used as chain extenders in the preparation of polyurethanes. However, some aromatic diamines are too reactive with isocyanates to permit proper handling, and it has also been found that some aromatic diamines provide polyurethanes having unsatisfactory physical properties. Another problem apt to be presented by the use of aromatic diamines is that many such compounds are known to be toxic or have a structure such as to make it predictable that, when tested, they will probably prove to be carcinogenic.
An object of this invention is to provide a novel aromatic diamine.
Another object is to provide a novel aromatic diamine which is suitable for the preparation of polyurethanes having acceptable physical properties.
A further object is to provide such an aromatic diamine which lacks the toxicological problems of carcinogenic diamines.
These and other objects are attained by the provision of 3,5-di(methylthio)-2,6-diaminotoluene.
US Referenced Citations (1)
| Number |
Name |
Date |
Kind |
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4670598 |
Davis |
Jun 1987 |
|
Divisions (1)
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Number |
Date |
Country |
| Parent |
619675 |
Jun 1984 |
|
Continuations (1)
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Number |
Date |
Country |
| Parent |
917168 |
Oct 1986 |
|
Continuation in Parts (2)
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Number |
Date |
Country |
| Parent |
224017 |
Jul 1988 |
|
| Parent |
783421 |
Oct 1985 |
|
Patent Grant
4982002
