Condensation products of substituted phenol sulfonic acid and formaldehyde
US4457874A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1982 |
| Grant date | Jul 3, 1984 |
| Priority date | — |
| Expiry date | Jul 9, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K23/12
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A dispersing agent which is PA1 (a) a condensation product of a substituted phenol sulfonic acid which is an arylphenol sulfonic acid or an aralkylphenol sulfonic acid with from about 0.5 to about 4 moles of formaldehyde per mole of substituted phenol sulfonic acid, or PA1 (b) a condensation product of (i) a substituted phenol sulfonic acid which is an arylphenol sulfonic acid or an aralkylphenol sulfonic acid and (ii) an aryl sulfonic acid with from about 0.5 to about 4 moles of formaldehyde per mole of substituted phenol sulfonic acid and aryl sulfonic acid wherein the weight ratio of substituted phenol sulfonic acid to aryl sulfonic acid is from about 0.95:0.05 to about 0.05:0.95. The dispersing agent may be used directly or reacted with a salt forming cation to obtain a salt. The condensation product is useful as a dispersing agent in hydraulic cement, mortar, concrete or the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.