Claims
- 1. The method of retarding the setting of gypsum paste which comprises incorporating in gypsum paste from 0.06% to 0.09% by weight of a phosphonocarboxylic compound of the formula ##STR6## wherein the radicals R are selected from hydrogen, alkali metal and ammonium.
- 2. A method according to claim 1 wherein R is alkali metal selected from sodium and potassium.
- 3. A method according to claim 1 wherein the phosphonocarboxylic compound is 3,3-diphosphono-pimelic acid.
Parent Case Info
This is a continuation of application Ser. No. 843,144 filed Oct. 17, 1977, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3941772 |
Ploger et al. |
Mar 1976 |
|
4034086 |
Ploger et al. |
Jul 1977 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
843144 |
Oct 1977 |
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