Process for inhibiting scale using maleic anhydride polymerized in reactive aromatic hydrocarbons
US5156744A · kind A · utility
5Cited by
8References
9Claims
0Family size
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Key dates
| Filing date | Sep 26, 1991 |
| Grant date | Oct 20, 1992 |
| Priority date | — |
| Expiry date | Sep 26, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F22/06
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Polymaleic anhydride having a weight average molecular weight by gel permeation chromatography of between 450 and 800 and a polydispersivity of between 1.0 and 1.15 is produced by polymerizing maleic anhydride, using a peroxide initiator in an amount not greater than 10% by weight of the anhydride, in a dilute solution in o-xylene or a substituted o-xylene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.