Oligomeric ester chain condensates of substituted 1-hydroxy-1,1-diphosphonic acid
US4190615A · kind A · utility
10Cited by
2References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 11, 1978 |
| Grant date | Feb 26, 1980 |
| Priority date | — |
| Expiry date | Sep 11, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/4075
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Phosphonic acid ester condensate oligomers are disclosed which are oligomeric ester condensates of alkyl-1-hydroxy-1,1-diphosphonic acid having the formula: ##STR1## where R.sub.1 and R.sub.2 each represent a group having the formula C.sub.x H.sub.2x+1, where x is from 6 to 13; Y is ##STR2## or hydrogen; M is a water soluble cation such as Na, K or NH.sub.4, and n is 1 or greater. The use of these materials as reverse emulsion breakers is also disclosed, as is a method for their preparation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.