Claims
- 1. An isocyanate-reactive mixture comprising
- (i) an organic active hydrogen containing material having a molecular weight of from 1000 to 8000 and containing at least two active hydrogen groups, and
- (ii) the reaction product of
- (a) an aromatic diamine which contains at least one non-reactive substituent in the ortho position to a first amino group and at least one non-reactive substituent in the ortho position to a second amino group, and
- (b) a cyclic carboxylic acid anhydride at a molar ratio of component (a) to component (b) of from 3:1 to 15:1.
- 2. The mixture of claim 1, wherein said ratio is from 5:1 to 10:1.
- 3. The mixture of claim 1, wherein said chain extender is used in an amount of from about 5 to about 50% by weight, based on the combined weight of said active hydrogen containing material and said chain extender.
Parent Case Info
This application is a division, of application Ser. No. 07/310,142 filed Feb. 13, 1989 U.S. Pat. No. 4,937,366.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3296148 |
Talbert et al. |
Jan 1967 |
|
3467605 |
Abercrombie et al. |
Sep 1969 |
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4296212 |
Ewen et al. |
Oct 1981 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
310142 |
Feb 1989 |
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